Pub Date : 2024-11-10DOI: 10.1016/j.colsurfa.2024.135741
Minki Sa , Zambaga Otgonbayar , Dahee Kang , Jungchul Noh , Suk Jekal , Jiwon Kim , Chang-Min Yoon
A novel LiDAR-detectable plate-like hollow black titanium dioxide (HbTiO2) is developed by recycling silicon sludge generated from silicon wafer sawing. By employing TiCl4 sol-gel synthesis, hydrofluoric acid etching, and NaBH4 reduction, the hollow-structured black TiO2 is successfully synthesized. Plate-like HbTiO2 readily mixed with hydrophilic varnish, owing to its inherent hydrophilic properties. With monolayer coating, HbTiO2-based paints exhibit the blackness (L* = 17.63) comparable to that of commercial black paints, indicating that NaBH4 successfully changed the color of TiO2 from white to black. In addition to its blackness, HbTiO2 exhibits a superior near-infrared (NIR) reflectance of ca. 26.8 R% at 905 nm, making it suitable for integration with the LiDAR systems used in autonomous vehicles. This high NIR reflectance ensures that HbTiO2 can effectively interact with the LiDAR sensors, attributing to the hollow structures and effective light reflection mechanism. Furthermore, the use of recycled silicon sludge not only offers a cost-effective alternative to traditional template materials but also promotes environmental sustainability by reducing solid waste. Our findings demonstrate the potential of HbTiO2 as an innovative and practical LiDAR-detectable black pigment, paving the way for advanced applications in autonomous vehicle technologies.
{"title":"Preparation of LiDAR-detectable black pigments via recycling the silicon sludge generated from the semiconductor manufacturing processes","authors":"Minki Sa , Zambaga Otgonbayar , Dahee Kang , Jungchul Noh , Suk Jekal , Jiwon Kim , Chang-Min Yoon","doi":"10.1016/j.colsurfa.2024.135741","DOIUrl":"10.1016/j.colsurfa.2024.135741","url":null,"abstract":"<div><div>A novel LiDAR-detectable plate-like hollow black titanium dioxide (HbTiO<sub>2</sub>) is developed by recycling silicon sludge generated from silicon wafer sawing. By employing TiCl<sub>4</sub> sol-gel synthesis, hydrofluoric acid etching, and NaBH<sub>4</sub> reduction, the hollow-structured black TiO<sub>2</sub> is successfully synthesized. Plate-like HbTiO<sub>2</sub> readily mixed with hydrophilic varnish, owing to its inherent hydrophilic properties. With monolayer coating, HbTiO<sub>2</sub>-based paints exhibit the blackness (<em>L</em>* = 17.63) comparable to that of commercial black paints, indicating that NaBH<sub>4</sub> successfully changed the color of TiO<sub>2</sub> from white to black. In addition to its blackness, HbTiO<sub>2</sub> exhibits a superior near-infrared (NIR) reflectance of <em>ca.</em> 26.8 <em>R</em>% at 905 nm, making it suitable for integration with the LiDAR systems used in autonomous vehicles. This high NIR reflectance ensures that HbTiO<sub>2</sub> can effectively interact with the LiDAR sensors, attributing to the hollow structures and effective light reflection mechanism. Furthermore, the use of recycled silicon sludge not only offers a cost-effective alternative to traditional template materials but also promotes environmental sustainability by reducing solid waste. Our findings demonstrate the potential of HbTiO<sub>2</sub> as an innovative and practical LiDAR-detectable black pigment, paving the way for advanced applications in autonomous vehicle technologies.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135741"},"PeriodicalIF":4.9,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653467","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The need of achieving low-impact and low-cost functional materials through sustainable and efficient methodologies is one of the goals of the current research in the field of materials science and energy storage. In this study, a new facile route for obtaining battery-like electrode Bi-based films is presented. Specifically, ∼1.3 μm-thick β-Bi2O3 films were prepared from oxynitrate via a simple sol-gel/elution process upon titanium foils, followed by annealing in forming gas at 350°C. A multi-technique approach, involving Raman, X-ray Photoelectron Spectroscopy, X-ray Diffraction, Scanning Electron Microscopy and optical characterization, demonstrates the formation of a nanocrystalline porous bismuth oxide (20–30 nm in size) consisting of β-Bi2O3 phase with the crucial presence of Bi0. Annealing at 350°C in different environments (i.e. air and N2), do not produce crystalline phases. The reported method improves the synthesis of β-Bi2O3 phase through a ∼1.3 μm-thick film realization and a controlled phase production by reactive annealing at moderate temperatures. Cyclic Voltammetry and Galvanostatic Charge Discharge analyses reveal a double-redox behaviour for the β-Bi2O3 /Bi0 battery electrode with a specific capacity (capacitance) of 195 mA*h/g (350 F/g) at 0.5 A/g. The data highlight the promising usage of sol-gel/elution for the realization of ∼1.3 μm-thick film for energy storage applications.
{"title":"Highly efficient β-Bi2O3/Bi battery electrodes by reactive annealing from sol-gel precursors","authors":"Giovanna Pellegrino , Giacometta Mineo , Vincenzina Strano , Gianluca Marcellino , Luca Pulvirenti , Federico Ursino , Salvatore Mirabella , Guglielmo G. Condorelli","doi":"10.1016/j.colsurfa.2024.135738","DOIUrl":"10.1016/j.colsurfa.2024.135738","url":null,"abstract":"<div><div>The need of achieving low-impact and low-cost functional materials through sustainable and efficient methodologies is one of the goals of the current research in the field of materials science and energy storage. In this study, a new facile route for obtaining battery-like electrode Bi-based films is presented. Specifically, ∼1.3 μm-thick β-Bi<sub>2</sub>O<sub>3</sub> films were prepared from oxynitrate via a simple sol-gel/elution process upon titanium foils, followed by annealing in forming gas at 350°C. A multi-technique approach, involving Raman, X-ray Photoelectron Spectroscopy, X-ray Diffraction, Scanning Electron Microscopy and optical characterization, demonstrates the formation of a nanocrystalline porous bismuth oxide (20–30 nm in size) consisting of β-Bi<sub>2</sub>O<sub>3</sub> phase with the crucial presence of Bi<sup>0</sup>. Annealing at 350°C in different environments (i.e. air and N<sub>2</sub>), do not produce crystalline phases. The reported method improves the synthesis of β-Bi<sub>2</sub>O<sub>3</sub> phase through a ∼1.3 μm-thick film realization and a controlled phase production by reactive annealing at moderate temperatures. Cyclic Voltammetry and Galvanostatic Charge Discharge analyses reveal a double-redox behaviour for the β-Bi<sub>2</sub>O<sub>3</sub> /Bi<sup>0</sup> battery electrode with a specific capacity (capacitance) of 195 mA*h/g (350 F/g) at 0.5 A/g. The data highlight the promising usage of sol-gel/elution for the realization of ∼1.3 μm-thick film for energy storage applications.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135738"},"PeriodicalIF":4.9,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.colsurfa.2024.135745
Guangguang Guan , Xiaoqiang Li , Jiebai Li , Lin Ma , Yangtao Zhou
Developing strong electromagnetic (EM) wave absorbing materials to solve the issue of EM radiation emanating from electronic devices in low-frequency range remains currently a great challenge. The majority of current solutions in low-frequency range are based on magnetic absorbent. However, this approach is constrained by the poor impedance matching, high production cost and limited absorption bandwidth. Herein, the novel reproducible cellulose-derived flawed graphite carbon material (represented as CFGC) was prepared by chemical and following simple carbonization method. Besides, the unique defect structure and the mechanism underlying microwave absorption (MA) are elaborated in detail. By fine-tuning the content of CFGC, the MA property is optimized. The minimum reflection loss (RLmin) of 50 wt% filling for CFGC is –42.08 dB at 4.08 GHz, showing an excellent MA property within the low-frequency range of C bands. Thus, the novel CFGC in this study provides a new and convenient way to solve low-frequency EM pollution.
开发强电磁波吸收材料以解决电子设备在低频范围内产生的电磁辐射问题，目前仍是一项巨大的挑战。目前大多数低频范围的解决方案都是基于磁性吸波材料。然而，这种方法受到阻抗匹配性差、生产成本高和吸收带宽有限的限制。在此，我们采用化学方法和简单的碳化法制备了新型可重复的纤维素衍生缺陷石墨碳材料（简称 CFGC）。此外，还详细阐述了其独特的缺陷结构和微波吸收（MA）机理。通过微调 CFGC 的含量，微波吸收特性得到了优化。当 CFGC 的填充量为 50 wt% 时，其在 4.08 GHz 频率下的最小反射损耗（RLmin）为 -42.08 dB，这表明其在 C 波段的低频范围内具有出色的 MA 特性。因此，本研究中的新型 CFGC 为解决低频电磁污染提供了一种新的便捷方法。
{"title":"Facile fabrication of cellulose-derived flawed graphite carbon with low-frequency minimum reflection loss in the C bands","authors":"Guangguang Guan , Xiaoqiang Li , Jiebai Li , Lin Ma , Yangtao Zhou","doi":"10.1016/j.colsurfa.2024.135745","DOIUrl":"10.1016/j.colsurfa.2024.135745","url":null,"abstract":"<div><div>Developing strong electromagnetic (EM) wave absorbing materials to solve the issue of EM radiation emanating from electronic devices in low-frequency range remains currently a great challenge. The majority of current solutions in low-frequency range are based on magnetic absorbent. However, this approach is constrained by the poor impedance matching, high production cost and limited absorption bandwidth. Herein, the novel reproducible cellulose-derived flawed graphite carbon material (represented as CFGC) was prepared by chemical and following simple carbonization method. Besides, the unique defect structure and the mechanism underlying microwave absorption (MA) are elaborated in detail. By fine-tuning the content of CFGC, the MA property is optimized. The minimum reflection loss (RL<sub>min</sub>) of 50 wt% filling for CFGC is –42.08 dB at 4.08 GHz, showing an excellent MA property within the low-frequency range of C bands. Thus, the novel CFGC in this study provides a new and convenient way to solve low-frequency EM pollution.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135745"},"PeriodicalIF":4.9,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.colsurfa.2024.135713
Mengzhu Li , Yiwei Pan , Sydney Ntshole , Zixun Li , Shusu Shen , Ganwei Zhang
Covalent organic frameworks (COFs) have advantages such as easy functionalization, abundant regular pores, low density, and are widely used in the preparation of membrane materials. In this study, the well-grown COF-LZU1 (LZU for Lanzhou University)/polyvinylidene fluoride (PVDF) loose nanofiltration (NF) composite membranes were prepared through oligomer-triggered interfacial polymerization (OT-IP) at room temperature. Due to its pore size of 1.72 nm, the prepared COF-LZU1/PVDF membrane not only exhibited an ultra-high rejection for dyes (99.4 % for Methyl blue, 99.7 % for Congo red, and 99.1 % for Eriochrome black T). In addition, the filtration experiment of the mixed CR/NaCl solution showed a dye/salt selectivity factor of 328.7, as well as a permeance of 77.0 L·m−2·h−1·bar−1 and a high pure water permeability of 112.3 L·m−2·h−1·bar−1. A continuous filtration experiment showed that the COF-LZU1/PVDF membrane exhibited excellent operational stability. The findings suggest that COF-LZU1/PVDF membrane show promise for use in separating dyes and salts.
{"title":"Fabrication of COF-LZU1/PVDF composite loose nanofiltration membranes through oligomer-triggered interfacial polymerization (OT-IP) for highly efficient dye/salt separation","authors":"Mengzhu Li , Yiwei Pan , Sydney Ntshole , Zixun Li , Shusu Shen , Ganwei Zhang","doi":"10.1016/j.colsurfa.2024.135713","DOIUrl":"10.1016/j.colsurfa.2024.135713","url":null,"abstract":"<div><div>Covalent organic frameworks (COFs) have advantages such as easy functionalization, abundant regular pores, low density, and are widely used in the preparation of membrane materials. In this study, the well-grown COF-LZU1 (LZU for Lanzhou University)/polyvinylidene fluoride (PVDF) loose nanofiltration (NF) composite membranes were prepared through oligomer-triggered interfacial polymerization (OT-IP) at room temperature. Due to its pore size of 1.72 nm, the prepared COF-LZU1/PVDF membrane not only exhibited an ultra-high rejection for dyes (99.4 % for Methyl blue, 99.7 % for Congo red, and 99.1 % for Eriochrome black T). In addition, the filtration experiment of the mixed CR/NaCl solution showed a dye/salt selectivity factor of 328.7, as well as a permeance of 77.0 L·m<sup>−2</sup>·h<sup>−1</sup>·bar<sup>−1</sup> and a high pure water permeability of 112.3 L·m<sup>−2</sup>·h<sup>−1</sup>·bar<sup>−1</sup>. A continuous filtration experiment showed that the COF-LZU1/PVDF membrane exhibited excellent operational stability. The findings suggest that COF-LZU1/PVDF membrane show promise for use in separating dyes and salts.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135713"},"PeriodicalIF":4.9,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653744","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.colsurfa.2024.135723
Lingqi Zeng , Haibo Liu , Hao Zhang , Wentao Xiong , Chengxin Wang , Kuo Liu , Yongqing Wang
In order to reveal the ice adhesion mechanism, this study proposes an ice/workpiece interface strain picking method and establishes a coupled numerical model of water phase change heat transfer and mechanics. The interfacial strain law of the workpiece surface with/without water during the water freezing process was investigated, and the time development characteristics of the water freezing interfacial strain were analysed. The results show that the water freezing interface strain goes through a rapid increase during the rapid cooling stage of water, a strain fluctuation stage under the mixed state of ice and water, and a stabilisation stage after the completion of the phase transformation. As the cooling temperature decreases, the strain generated by water in the subcooled state is gradually larger than the strain of the workpiece contracted at low temperature, the trend of water phase transformation and volume increase is more and more significant, and the maximum freezing interfacial strain on the surface of the workpiece increases gradually. The interfacial strains and deformations of different materials show similar trends, but there are differences in the frozen interfacial strains, which are related to the modulus of elasticity and coefficient of thermal expansion of the materials. The results of this study can help to understand the adhesion mechanism of ice on the material surface, and provide a reference for the engineering field in terms of anti-icing, de-icing and icing.
{"title":"Characteristics of time series development and formation mechanism of icing interface strain under three-dimensional freezing conditions","authors":"Lingqi Zeng , Haibo Liu , Hao Zhang , Wentao Xiong , Chengxin Wang , Kuo Liu , Yongqing Wang","doi":"10.1016/j.colsurfa.2024.135723","DOIUrl":"10.1016/j.colsurfa.2024.135723","url":null,"abstract":"<div><div>In order to reveal the ice adhesion mechanism, this study proposes an ice/workpiece interface strain picking method and establishes a coupled numerical model of water phase change heat transfer and mechanics. The interfacial strain law of the workpiece surface with/without water during the water freezing process was investigated, and the time development characteristics of the water freezing interfacial strain were analysed. The results show that the water freezing interface strain goes through a rapid increase during the rapid cooling stage of water, a strain fluctuation stage under the mixed state of ice and water, and a stabilisation stage after the completion of the phase transformation. As the cooling temperature decreases, the strain generated by water in the subcooled state is gradually larger than the strain of the workpiece contracted at low temperature, the trend of water phase transformation and volume increase is more and more significant, and the maximum freezing interfacial strain on the surface of the workpiece increases gradually. The interfacial strains and deformations of different materials show similar trends, but there are differences in the frozen interfacial strains, which are related to the modulus of elasticity and coefficient of thermal expansion of the materials. The results of this study can help to understand the adhesion mechanism of ice on the material surface, and provide a reference for the engineering field in terms of anti-icing, de-icing and icing.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135723"},"PeriodicalIF":4.9,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142654021","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.colsurfa.2024.135742
Shujunwen Gao , Xiaolin Qiu
Pickering emulsions (PEs) loaded with essential oils have proven to be a promising delivery system in food preservation, thus attracting increasing research attention. In this study, epigallocatechin gallate (EGCG) enhanced whey protein isolate(WPI)-gum Arabic(GA) ternary spherical nanocomplex (WGE) was fabricated by thermal and pH double-induced method and used to stabilize antibacterial, antioxidant and sustained release Pickering emulsions loaded with cinnamaldehyde. The WGE nanocomplex exhibited biphasic surface wettability (78.2±2.8°), 1.73 times that of WPI, as well as outstanding interfacial tension (5.60 mN/m), 44.6 % lower than that of WPI-GA, mainly due to the electrostatic interactions between WPI and GA and enhanced surface hydrophobicity causing by EGCG, indicating its superb ability to stabilize Pickering emulsions. Using WGE nanocomplex as the Pickering emulsion stabilizer, PEs template was constructed. Confocal laser scanning microscopy (CLSM) showed the formation of a dense oil-water interface layer and gel-like network structure, which demonstrated good storage stability against creaming and coalescence, benefiting to cinnamaldehyde encapsulation. Finally, cinnamaldehyde was encapsulated effectively using this PEs pattern with high encapsulation efficiency under different conditions. The cinnamaldehyde Pickering emulsions (CPEs) demonstrated superior antioxidant ability against DPPH (>85 %) and ABTS (>78 %), as well as effective antibacterial capability against E. coli (>99.9999 %) and S. aureus (>99.99 %) than pure cinnamaldehyde. Moreover, CPEs showed slow sustained-release ability, which could satisfyingly prolong the biological activity of cinnamaldehyde. Therefore, the WGE stabilized cinnamaldehyde Pickering emulsions fabricated in this work might provide a promising alternative for the delivery of antibacterial and controlled release essential oils in the food industry.
{"title":"Development of gel-like, high encapsulation efficiency and antibacterial cinnamaldehyde-loaded Pickering emulsion stabilized by EGCG enhanced whey protein isolate-gum arabic ternary nanocomplex","authors":"Shujunwen Gao , Xiaolin Qiu","doi":"10.1016/j.colsurfa.2024.135742","DOIUrl":"10.1016/j.colsurfa.2024.135742","url":null,"abstract":"<div><div>Pickering emulsions (PEs) loaded with essential oils have proven to be a promising delivery system in food preservation, thus attracting increasing research attention. In this study, epigallocatechin gallate (EGCG) enhanced whey protein isolate(WPI)-gum Arabic(GA) ternary spherical nanocomplex (WGE) was fabricated by thermal and pH double-induced method and used to stabilize antibacterial, antioxidant and sustained release Pickering emulsions loaded with cinnamaldehyde. The WGE nanocomplex exhibited biphasic surface wettability (78.2±2.8°), 1.73 times that of WPI, as well as outstanding interfacial tension (5.60 mN/m), 44.6 % lower than that of WPI-GA, mainly due to the electrostatic interactions between WPI and GA and enhanced surface hydrophobicity causing by EGCG, indicating its superb ability to stabilize Pickering emulsions. Using WGE nanocomplex as the Pickering emulsion stabilizer, PEs template was constructed. Confocal laser scanning microscopy (CLSM) showed the formation of a dense oil-water interface layer and gel-like network structure, which demonstrated good storage stability against creaming and coalescence, benefiting to cinnamaldehyde encapsulation. Finally, cinnamaldehyde was encapsulated effectively using this PEs pattern with high encapsulation efficiency under different conditions. The cinnamaldehyde Pickering emulsions (CPEs) demonstrated superior antioxidant ability against DPPH (>85 %) and ABTS (>78 %), as well as effective antibacterial capability against <em>E. coli</em> (>99.9999 %) and <em>S. aureus</em> (>99.99 %) than pure cinnamaldehyde. Moreover, CPEs showed slow sustained-release ability, which could satisfyingly prolong the biological activity of cinnamaldehyde. Therefore, the WGE stabilized cinnamaldehyde Pickering emulsions fabricated in this work might provide a promising alternative for the delivery of antibacterial and controlled release essential oils in the food industry.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135742"},"PeriodicalIF":4.9,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.colsurfa.2024.135695
Linghui Cao, Yuanxinyi Zhou, Tianyu Shen, Aijuan Xie , Shiping Luo , Baozhu Yang
Dopamine (DA), widely recognized as the most prevalent catecholamine neurotransmitter in the brain, functions as a vital regulator of various physiological processes within the central nervous system. Meanwhile, uric acid (UA) serves as the terminal product of purine metabolism, and hyperuricemia emerges as a significant risk factor for gout, with a steep escalation in risk as blood uric acid levels surge. Consequently, monitoring the concentrations of DA and UA in biological fluids is crucial not only for the treatment of related disorders but also for enhancing disease prevention strategies. In this work, the blooming hydrangea shaped ZnCo(OH)F/carbon dots (CDs) composite was grown on carbon cloth (CC) substrate by a simple hydrothermal method, which was used as a flexible sensor for the detection of DA and UA. The unique open structure and morphologic adjustment strategy of ZnCo(OH)F/CDs/CC provided a large surface area and highly exposed active site. After screening the experimental variables that affect the sensor performance, the optimal ZnCo(OH)F/CDs/CC flexible electrode achieved individual and simultaneous detection for DA and UA in the concentration ranges of 1.0220.0 µM and 1.0500.0 µM, the detection limits (LOD) of DA and UA were 0.0129 and 0.044 μM, respectively (S/N=3). In addition, the sensor exhibited good repeatability, stability and selectivity, realizing the detection of DA and UA in human serum with recovery rate of 95.20 % 105.3 %. Also, the density functional theory (DFT) calculations were used to explore the interaction between electrode material and detected substrate. A simple hydrothermal method was utilized to grow the ZnCo(OH)F/CDs composite onto the CC substrate. The presence of F− in ZnCo(OH)F can increase the charge mobility and improve the conductivity. ZnCo(OH)F/CDs/CC as flexible electrode material can determine DA and UA simultaneously in human serum with a satisfactory recovery rate. This flexible sensor has a broad application prospect in the manufacture of wearable devices.
多巴胺（DA）被公认为大脑中最常见的儿茶酚胺神经递质，是中枢神经系统内各种生理过程的重要调节剂。同时，尿酸（UA）是嘌呤代谢的最终产物，高尿酸血症是痛风的一个重要风险因素，随着血尿酸水平的飙升，风险也会急剧增加。因此，监测生物体液中 DA 和 UA 的浓度不仅对相关疾病的治疗至关重要，对加强疾病预防策略也至关重要。本研究采用简单的水热法在碳布（CC）基底上生长了绣球花状的 ZnCo(OH)F/carbon dots (CDs) 复合材料，并将其用作检测 DA 和 UA 的柔性传感器。ZnCo(OH)F/CDs/CC独特的开放式结构和形貌调整策略提供了较大的比表面积和高度暴露的活性位点。在对影响传感器性能的实验变量进行筛选后，最优的 ZnCo(OH)F/CDs/CC 柔性电极实现了在 1.0220.0 µM 和 1.0500.0 µM 浓度范围内对 DA 和 UA 的单独和同时检测，DA 和 UA 的检出限（LOD）分别为 0.0129 和 0.044 μM（S/N=3）。此外，该传感器还具有良好的重复性、稳定性和选择性，实现了对人血清中 DA 和 UA 的检测，回收率为 95.20 % 105.3 %。此外，还利用密度泛函理论（DFT）计算探讨了电极材料与检测基质之间的相互作用。利用简单的水热法在 CC 基底上生长了 ZnCo(OH)F/CDs 复合材料。ZnCo(OH)F 中 F- 的存在可以增加电荷迁移率并提高导电性。ZnCo(OH)F/CDs/CC 作为柔性电极材料可以同时测定人血清中的 DA 和 UA，且回收率令人满意。这种柔性传感器在可穿戴设备的制造中具有广阔的应用前景。
{"title":"Carbon dots modified hydrange-shaped ZnCo(OH)F used as a flexible electrode for sensitive detection of dopamine and uric acid","authors":"Linghui Cao, Yuanxinyi Zhou, Tianyu Shen, Aijuan Xie , Shiping Luo , Baozhu Yang","doi":"10.1016/j.colsurfa.2024.135695","DOIUrl":"10.1016/j.colsurfa.2024.135695","url":null,"abstract":"<div><div>Dopamine (DA), widely recognized as the most prevalent catecholamine neurotransmitter in the brain, functions as a vital regulator of various physiological processes within the central nervous system. Meanwhile, uric acid (UA) serves as the terminal product of purine metabolism, and hyperuricemia emerges as a significant risk factor for gout, with a steep escalation in risk as blood uric acid levels surge. Consequently, monitoring the concentrations of DA and UA in biological fluids is crucial not only for the treatment of related disorders but also for enhancing disease prevention strategies. In this work, the blooming hydrangea shaped ZnCo(OH)F/carbon dots (CDs) composite was grown on carbon cloth (CC) substrate by a simple hydrothermal method, which was used as a flexible sensor for the detection of DA and UA. The unique open structure and morphologic adjustment strategy of ZnCo(OH)F/CDs/CC provided a large surface area and highly exposed active site. After screening the experimental variables that affect the sensor performance, the optimal ZnCo(OH)F/CDs/CC flexible electrode achieved individual and simultaneous detection for DA and UA in the concentration ranges of 1.0<img>220.0 µM and 1.0<img>500.0 µM, the detection limits (LOD) of DA and UA were 0.0129 and 0.044 μM, respectively (S/N=3). In addition, the sensor exhibited good repeatability, stability and selectivity, realizing the detection of DA and UA in human serum with recovery rate of 95.20 % <img> 105.3 %. Also, the density functional theory (DFT) calculations were used to explore the interaction between electrode material and detected substrate. A simple hydrothermal method was utilized to grow the ZnCo(OH)F/CDs composite onto the CC substrate. The presence of F<sup>−</sup> in ZnCo(OH)F can increase the charge mobility and improve the conductivity. ZnCo(OH)F/CDs/CC as flexible electrode material can determine DA and UA simultaneously in human serum with a satisfactory recovery rate. This flexible sensor has a broad application prospect in the manufacture of wearable devices.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135695"},"PeriodicalIF":4.9,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653462","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-08DOI: 10.1016/j.colsurfa.2024.135664
Imtiaz Ahmad
Excessive surfactant molecules within the solution adhere to highly ordered pyrolytic graphite (HOPG) when a droplet containing gold nanorods evaporates, leading to the emergence of a unique coffee-ring pattern. The combination of surface hydrophobicity and evaporation of the aqueous phase results in a stick-slip motion, which enhances the convective hydrodynamics of suspended particles. This phenomenon initiates interactions that influence the deposition and flow dynamics inside the droplet. High-resolution scanning electron microscopy (HRSEM) does not provide significant insights into regions potentially linked to cetyltrimethylammonium bromide (CTAB) molecules, whereas the atomic force microscope (AFM) displays the presence of gold nanoparticles arranged by CTAB within specific CTAB patches. The layers forms with varying heights and gaps between them, indicating diverse adhesion of CTAB. The analytical focus lies on the quantitative assessment of CTAB molecules, stripe dimensions, and energy profiles influenced by concentration and the effective positioning of CTAB-coated gold nanorods in CTAB-covered regions. AFM examination reveals CTAB molecular stripes on HOPG, showing a binding energy of −20 kJ/mol with the surface, −10 kJ/mol for nitrogen bonding with HOPG, and a total binding energy (BE) of −60 kJ/mol, considering various contributing factors. Completely parallel aligned molecules (CPAM) exhibit higher binding energy than non-perfectly aligned molecules (NPAM) due to maximum Van der Waals (VdW) interactions, ideal electrostatic interactions, and minimal steric repulsion. The difference in binding energy between perfectly and non-perfectly aligned molecules is around 20kJ/mol, emphasizing the importance of molecular orientation. As temperature rises from 298 K to 348 K, the likelihood of NPAM desorption increases significantly, with the binding energy shifting from 2.5kJ/mol to 4.1kJ/mol. Temperature significantly influences the equilibrium of molecules on HOPG surfaces. The emphasis is on elucidating the alterations in energy levels during nanorod aggregation on CTAB areas compared to bare HOPG surfaces, underscoring the impact of nanorods on CTAB micelle deformation energy. Observations on the variation in CTAB desorption rates with temperature changes underscore the dynamic nature of molecular binding energy associated with surface properties, underscoring the importance of molecular configuration and energy transfers in nanoscale systems.
{"title":"Surfactant molecules and nano gold on HOPG: Experiment and theory","authors":"Imtiaz Ahmad","doi":"10.1016/j.colsurfa.2024.135664","DOIUrl":"10.1016/j.colsurfa.2024.135664","url":null,"abstract":"<div><div>Excessive surfactant molecules within the solution adhere to highly ordered pyrolytic graphite (HOPG) when a droplet containing gold nanorods evaporates, leading to the emergence of a unique coffee-ring pattern. The combination of surface hydrophobicity and evaporation of the aqueous phase results in a stick-slip motion, which enhances the convective hydrodynamics of suspended particles. This phenomenon initiates interactions that influence the deposition and flow dynamics inside the droplet. High-resolution scanning electron microscopy (HRSEM) does not provide significant insights into regions potentially linked to cetyltrimethylammonium bromide (CTAB) molecules, whereas the atomic force microscope (AFM) displays the presence of gold nanoparticles arranged by CTAB within specific CTAB patches. The layers forms with varying heights and gaps between them, indicating diverse adhesion of CTAB. The analytical focus lies on the quantitative assessment of CTAB molecules, stripe dimensions, and energy profiles influenced by concentration and the effective positioning of CTAB-coated gold nanorods in CTAB-covered regions. AFM examination reveals CTAB molecular stripes on HOPG, showing a binding energy of −20 kJ/mol with the surface, −10 kJ/mol for nitrogen bonding with HOPG, and a total binding energy (BE) of −60 kJ/mol, considering various contributing factors. Completely parallel aligned molecules (CPAM) exhibit higher binding energy than non-perfectly aligned molecules (NPAM) due to maximum Van der Waals (VdW) interactions, ideal electrostatic interactions, and minimal steric repulsion. The difference in binding energy between perfectly and non-perfectly aligned molecules is around 20kJ/mol, emphasizing the importance of molecular orientation. As temperature rises from 298 K to 348 K, the likelihood of NPAM desorption increases significantly, with the binding energy shifting from 2.5kJ/mol to 4.1kJ/mol. Temperature significantly influences the equilibrium of molecules on HOPG surfaces. The emphasis is on elucidating the alterations in energy levels during nanorod aggregation on CTAB areas compared to bare HOPG surfaces, underscoring the impact of nanorods on CTAB micelle deformation energy. Observations on the variation in CTAB desorption rates with temperature changes underscore the dynamic nature of molecular binding energy associated with surface properties, underscoring the importance of molecular configuration and energy transfers in nanoscale systems.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135664"},"PeriodicalIF":4.9,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Antibacterial hydrogel nanoparticles are expected to be used in many biomedical applications, such as drug delivery and the development of antibacterial materials. In this study, we developed a synthesis for hydrogel nanoparticles that are dispersible in liquid media and have antibacterial properties. The particles were synthesized by copolymerizing a hydrophilic monomer (2-hydroxyethyl methacrylate), a cationic monomer containing a quaternary ammonium cation (trimethylaminoethyl methacrylate chloride), and a crosslinker (ethylene glycol dimethacrylate) in an aqueous solution with a cationic polymerization initiator (2,2′-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride) to form a hydrogel. A hydrophobic monomer (methyl methacrylate) was then added and the polymerization was continued. The number average particle diameter by scanning electron microscopy was 122 nm, and the hydrodynamic diameter by dynamic light scattering measurement in water was about 380 nm, suggesting swelling of the particles by water. Furthermore, water was able to penetrate the solidified dry powder, confirming the hydrophilic properties of the particles. The zeta potential of the particles was about +40 mV, and bovine serum albumin, which generally has a high adsorption to positively charged substances, was adsorbed in large amounts to the particle surface, indicating that the particles had sufficient cationicity. The particles maintained stable dispersions even in liquid media with high ionic strength and containing impurities, which is important for nanoparticles used in medical and hygiene applications. The antibacterial activity of the particles was evaluated by incubation with Klebsiella pneumoniae, a Gram-negative bacterium. Almost no K. pneumoniae remained present in the supernatant after incubation, demonstrating the antibacterial properties of the particles.
{"title":"Aqueous-phase synthesis of cationic hydrogel nanoparticles with antibacterial properties","authors":"Noriko Yamauchi , Yuka Sue , Tomoya Nagai , Shuntaro Hakozaki , Takeru Saito , Yoichiro Sogame , Yoshio Kobayashi","doi":"10.1016/j.colsurfa.2024.135737","DOIUrl":"10.1016/j.colsurfa.2024.135737","url":null,"abstract":"<div><div>Antibacterial hydrogel nanoparticles are expected to be used in many biomedical applications, such as drug delivery and the development of antibacterial materials. In this study, we developed a synthesis for hydrogel nanoparticles that are dispersible in liquid media and have antibacterial properties. The particles were synthesized by copolymerizing a hydrophilic monomer (2-hydroxyethyl methacrylate), a cationic monomer containing a quaternary ammonium cation (trimethylaminoethyl methacrylate chloride), and a crosslinker (ethylene glycol dimethacrylate) in an aqueous solution with a cationic polymerization initiator (2,2′-azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride) to form a hydrogel. A hydrophobic monomer (methyl methacrylate) was then added and the polymerization was continued. The number average particle diameter by scanning electron microscopy was 122 nm, and the hydrodynamic diameter by dynamic light scattering measurement in water was about 380 nm, suggesting swelling of the particles by water. Furthermore, water was able to penetrate the solidified dry powder, confirming the hydrophilic properties of the particles. The zeta potential of the particles was about +40 mV, and bovine serum albumin, which generally has a high adsorption to positively charged substances, was adsorbed in large amounts to the particle surface, indicating that the particles had sufficient cationicity. The particles maintained stable dispersions even in liquid media with high ionic strength and containing impurities, which is important for nanoparticles used in medical and hygiene applications. The antibacterial activity of the particles was evaluated by incubation with <em>Klebsiella pneumoniae</em>, a Gram-negative bacterium. Almost no <em>K. pneumoniae</em> remained present in the supernatant after incubation, demonstrating the antibacterial properties of the particles.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135737"},"PeriodicalIF":4.9,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653471","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Self-assembled physical nanocomposite hydrogels based on bio-based poly(itaconic acid) and Laponite® nanoclays were prepared and tested as possible CO2 sensors in smart food packaging. The structure and mechanical properties of the fabricated hydrogels were controlled by changing the initial pH of the aqueous Laponite® dispersions stabilised by tetrasodium pyrophosphate. The dispersions were studied by SAXS and analysed using circular disc and fractal model to determine clay agglomeration tendency. Sodium and pyrophosphate ions mobility was investigated by 23Na and 31P 1D as well as spin-spin relaxation times T2 NMR measurements. The rheological behaviour of the produced hydrogels was studied by oscillatory shear measurements. It was found that decreasing the pH of the Laponite® nanodispersions up to 8 increases the strength of the physical interactions between the nanoclays, dispersant, and polyelectrolyte chains, which enables production of dimensionally stable and mechanically robust hydrogels. Their potential application as the CO2-sensitive matrix for construction of environmentally friendly colorimetric sensors was demonstrated showing the CO2 sorption capacity of 0.07 mmol CO2/g. A prototype device of hydrogel sensor was built and tested in a food packaging application to monitor the plum fruit respiration processes.
{"title":"pH-controlled-ion-mobility of Laponite-phosphate dispersion for physical hydrogel with improved mechanical properties and sensitivity to CO2","authors":"Martina Nevoralová , Sonia Bujok , Rafał Konefał , Ewa Mierzwa , Magdalena Konefał , Hynek Beneš , Szczepan Bednarz","doi":"10.1016/j.colsurfa.2024.135743","DOIUrl":"10.1016/j.colsurfa.2024.135743","url":null,"abstract":"<div><div>Self-assembled physical nanocomposite hydrogels based on bio-based poly(itaconic acid) and Laponite® nanoclays were prepared and tested as possible CO<sub>2</sub> sensors in smart food packaging. The structure and mechanical properties of the fabricated hydrogels were controlled by changing the initial pH of the aqueous Laponite® dispersions stabilised by tetrasodium pyrophosphate. The dispersions were studied by SAXS and analysed using circular disc and fractal model to determine clay agglomeration tendency. Sodium and pyrophosphate ions mobility was investigated by <sup>23</sup>Na and <sup>31</sup>P 1D as well as spin-spin relaxation times T<sub>2</sub> NMR measurements. The rheological behaviour of the produced hydrogels was studied by oscillatory shear measurements. It was found that decreasing the pH of the Laponite® nanodispersions up to 8 increases the strength of the physical interactions between the nanoclays, dispersant, and polyelectrolyte chains, which enables production of dimensionally stable and mechanically robust hydrogels. Their potential application as the CO<sub>2</sub>-sensitive matrix for construction of environmentally friendly colorimetric sensors was demonstrated showing the CO<sub>2</sub> sorption capacity of 0.07 mmol CO<sub>2</sub>/g. A prototype device of hydrogel sensor was built and tested in a food packaging application to monitor the plum fruit respiration processes.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"705 ","pages":"Article 135743"},"PeriodicalIF":4.9,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142653352","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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