Colloids and Surfaces A: Physicochemical and Engineering Aspects最新文献_第4页

A comparative evaluation of green surfactant-assisted calcium phosphate (CaP) coatings developed through electrodeposition and biomimetic routes

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-12-02 DOI: 10.1016/j.colsurfa.2024.135889

Pakanati Siva Prasad , Prasanna Kumar Byram , Hushnaara Hadem , Chinmay Hazra , Ramkrishna Sen , Siddhartha Das , Karabi Das

This study compares the properties of green surfactant-assisted calcium phosphate (CaP) coatings developed on 316 L stainless steel (316 L SS) substrates using electrodeposition (ED) and biomimetic (BM) methods. The influence of biosurfactants (BS) on these coatings' properties, deposited through both processes, is also investigated. X-ray diffraction (XRD), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), and Fourier-transform infrared spectroscopy (FTIR) confirm the presence of brushite and hydroxyapatite (HAp) in the ED coatings, while BM coatings show only HAp without BS and both brushite and HAp phases with BS. The SEM analysis reveals distinct morphologies, with BS-assisted coatings showing more organized structures. The presence of BS results in more uniform coatings in both ED and BM methods. Atomic force microscopy (AFM) analysis indicates that BM coatings are smoother than ED coatings, and BS further reduces surface roughness. The comprehensive evaluations through nanoindentation, scratch testing, and corrosion studies reveal that BS-assisted ED coatings exhibit superior hardness (H), elastic modulus (E), adhesion strength, and corrosion resistance. Cytocompatibility studies using the MTT assay demonstrate that all coatings support cell attachment and proliferation without cytotoxic effects, with BM coatings showing slightly better cell viability. This study highlights the potential of green surfactant-assisted CaP coatings developed using ED and BM methods, for improving the biocompatibility and other biological properties of 316 L SS implants.

{"title":"A comparative evaluation of green surfactant-assisted calcium phosphate (CaP) coatings developed through electrodeposition and biomimetic routes","authors":"Pakanati Siva Prasad , Prasanna Kumar Byram , Hushnaara Hadem , Chinmay Hazra , Ramkrishna Sen , Siddhartha Das , Karabi Das","doi":"10.1016/j.colsurfa.2024.135889","DOIUrl":"10.1016/j.colsurfa.2024.135889","url":null,"abstract":"<div><div>This study compares the properties of green surfactant-assisted calcium phosphate (CaP) coatings developed on 316 L stainless steel (316 L SS) substrates using electrodeposition (ED) and biomimetic (BM) methods. The influence of biosurfactants (BS) on these coatings' properties, deposited through both processes, is also investigated. X-ray diffraction (XRD), scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS), and Fourier-transform infrared spectroscopy (FTIR) confirm the presence of brushite and hydroxyapatite (HAp) in the ED coatings, while BM coatings show only HAp without BS and both brushite and HAp phases with BS. The SEM analysis reveals distinct morphologies, with BS-assisted coatings showing more organized structures. The presence of BS results in more uniform coatings in both ED and BM methods. Atomic force microscopy (AFM) analysis indicates that BM coatings are smoother than ED coatings, and BS further reduces surface roughness. The comprehensive evaluations through nanoindentation, scratch testing, and corrosion studies reveal that BS-assisted ED coatings exhibit superior hardness (H), elastic modulus (E), adhesion strength, and corrosion resistance. Cytocompatibility studies using the MTT assay demonstrate that all coatings support cell attachment and proliferation without cytotoxic effects, with BM coatings showing slightly better cell viability. This study highlights the potential of green surfactant-assisted CaP coatings developed using ED and BM methods, for improving the biocompatibility and other biological properties of 316 L SS implants.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135889"},"PeriodicalIF":4.9,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098882","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}

引用次数: 0

Efficient photocatalytic degradation of phenolic pollutants using MIL-100(Fe)@Zn3In2S6 Z-scheme heterojunction

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-12-02 DOI: 10.1016/j.colsurfa.2024.135884

Shuyu Chen , Zhengkai Wu , Xueying Cheng , Lu Chen , Yunning Chen , Yingna Guo , Changhua Wang , Qingkun Shang

In this work, we used a simple hydrothermal method to in-situ grow Zn₃In₂S₆ on MIL-100(Fe) octahedra, and obtained a MIL-100(Fe)@Zn₃In₂S₆ Z-scheme heterojunction photocatalyst. We systematically studied its performance in degrading phenol and p-nitrophenol (PNP) under visible light. MIL-ZIS₆-2 can remove 89.1 % of phenol within 120 min and nearly 100 % of PNP within 60 min. Its photocatalytic activity to the degradation of phenol is 30.7 times and 1.7 times higher than that of MIL-100(Fe) and Zn₃In₂S₆, respectively. And the photocatalytic activity to degrade PNP is 18.2 times and 1.4 times higher than MIL-100(Fe) and Zn₃In₂S₆. Further research was conducted on its band structure and photocatalytic response mechanism through photoelectric performance, ultraviolet photo-electron spectroscopy, and electron spin resonance spectrometer testing. The results showed that the formation of Z-scheme heterojunction not only increased the specific surface area of the composite photocatalyst, enabling it to provide more reaction sites, but also effectively suppressed the recombination of photogenerated holes and electrons, improving the redox ability of the photocatalyst. This work provides a new perspective for constructing efficient Zn₃In₂S₆-based composite photocatalysts and addressing environmental issues.

{"title":"Efficient photocatalytic degradation of phenolic pollutants using MIL-100(Fe)@Zn3In2S6 Z-scheme heterojunction","authors":"Shuyu Chen , Zhengkai Wu , Xueying Cheng , Lu Chen , Yunning Chen , Yingna Guo , Changhua Wang , Qingkun Shang","doi":"10.1016/j.colsurfa.2024.135884","DOIUrl":"10.1016/j.colsurfa.2024.135884","url":null,"abstract":"<div><div>In this work, we used a simple hydrothermal method to in-situ grow Zn<sub>3</sub>In<sub>2</sub>S<sub>6</sub> on MIL-100(Fe) octahedra, and obtained a MIL-100(Fe)@Zn<sub>3</sub>In<sub>2</sub>S<sub>6</sub> Z-scheme heterojunction photocatalyst. We systematically studied its performance in degrading phenol and p-nitrophenol (PNP) under visible light. MIL-ZIS<sub>6</sub>-2 can remove 89.1 % of phenol within 120 min and nearly 100 % of PNP within 60 min. Its photocatalytic activity to the degradation of phenol is 30.7 times and 1.7 times higher than that of MIL-100(Fe) and Zn<sub>3</sub>In<sub>2</sub>S<sub>6</sub>, respectively. And the photocatalytic activity to degrade PNP is 18.2 times and 1.4 times higher than MIL-100(Fe) and Zn<sub>3</sub>In<sub>2</sub>S<sub>6</sub>. Further research was conducted on its band structure and photocatalytic response mechanism through photoelectric performance, ultraviolet photo-electron spectroscopy, and electron spin resonance spectrometer testing. The results showed that the formation of Z-scheme heterojunction not only increased the specific surface area of the composite photocatalyst, enabling it to provide more reaction sites, but also effectively suppressed the recombination of photogenerated holes and electrons, improving the redox ability of the photocatalyst. This work provides a new perspective for constructing efficient Zn<sub>3</sub>In<sub>2</sub>S<sub>6</sub>-based composite photocatalysts and addressing environmental issues.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135884"},"PeriodicalIF":4.9,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098884","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}

引用次数: 0

Enhancing CO2 foam stability with hexane vapours: Mitigating coarsening and drainage rates

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-12-01 DOI: 10.1016/j.colsurfa.2024.135867

Pouria Amani, Ali Salehi, Jinjie Wang, Mahshid Firouzi

CO₂ foams often suffer from poor stability due to high coarsening and coalescence rates, limiting their effectiveness in various applications. While it is well-established that small amounts of insoluble vapours such as alkane or fluorocarbon vapours can impede coarsening and recent studies have demonstrated their impact on coalescence, their specific effect on the CO₂ foams has not been studied. This research provides a comprehensive examination of stabilising effect of hexane on CO₂ foams in the presence of sodium dodecylbenzenesulfonate (SDBS). We investigated the foam stability of CO₂ foams, benchmarking them against N₂ foams by analysing foam lifetime, liquid drainage rate, and the evolution of bubble size. Additionally, we quantified the stabilising impact of hexane by calculating the coarsening rate. To gain insights into the adsorption mechanism of surfactants in the presence of hexane, we conducted surface tension and interfacial dilational rheology measurements, which demonstrated an increased adsorption of surfactant molecules at the interface and increased dilational viscoelasticity of interface when n-hexane was present. The introduction of hexane significantly improved foam stability, reducing coarsening rates by more than an order of magnitude. This improvement in foam stability is attributed to inhibited CO₂ diffusion from the bubbles, as well as enhanced surfactant adsorption and surface elasticity, resulting in an approximate 3.6-fold increase in foam half-life.

{"title":"Enhancing CO2 foam stability with hexane vapours: Mitigating coarsening and drainage rates","authors":"Pouria Amani, Ali Salehi, Jinjie Wang, Mahshid Firouzi","doi":"10.1016/j.colsurfa.2024.135867","DOIUrl":"10.1016/j.colsurfa.2024.135867","url":null,"abstract":"<div><div>CO<sub>2</sub> foams often suffer from poor stability due to high coarsening and coalescence rates, limiting their effectiveness in various applications. While it is well-established that small amounts of insoluble vapours such as alkane or fluorocarbon vapours can impede coarsening and recent studies have demonstrated their impact on coalescence, their specific effect on the CO<sub>2</sub> foams has not been studied. This research provides a comprehensive examination of stabilising effect of hexane on CO<sub>2</sub> foams in the presence of sodium dodecylbenzenesulfonate (SDBS). We investigated the foam stability of CO<sub>2</sub> foams, benchmarking them against N<sub>2</sub> foams by analysing foam lifetime, liquid drainage rate, and the evolution of bubble size. Additionally, we quantified the stabilising impact of hexane by calculating the coarsening rate. To gain insights into the adsorption mechanism of surfactants in the presence of hexane, we conducted surface tension and interfacial dilational rheology measurements, which demonstrated an increased adsorption of surfactant molecules at the interface and increased dilational viscoelasticity of interface when n-hexane was present. The introduction of hexane significantly improved foam stability, reducing coarsening rates by more than an order of magnitude. This improvement in foam stability is attributed to inhibited CO<sub>2</sub> diffusion from the bubbles, as well as enhanced surfactant adsorption and surface elasticity, resulting in an approximate 3.6-fold increase in foam half-life.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135867"},"PeriodicalIF":4.9,"publicationDate":"2024-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098894","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}

引用次数: 0

Biomimetic gaseous plastron for blocking fouling-associated biological colonization

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-30 DOI: 10.1016/j.colsurfa.2024.135856

Hao Fu, Minghao Cai, Peijun Liao, Wei Bing

Surface micro-/nanostructures and wettability play important roles in gaseous plastron stability. Inspired by the structure and function of Salvinia and lotus leaf, the microstructure-silicon dioxide-graphene-silicone rubber (MS-SiO₂-GN-SR) composites with bubble trapping ability were synthesized. MS-SiO₂-GN-SR can rapidly adsorb a large number of air bubbles under water to form a large gaseous plastron, which can be used as an antifouling barrier to prevent microbial invasion. MS-SiO₂-GN-SR has a strong bubble adsorption function due to its superhydrophobicity and surface roughness. Under dynamic conditions, compared with GN-SR, the adhesion of Gram-negative bacteria, Gram-positive bacteria, and marine algae attachment on the surface of MS-SiO₂-GN-SR decreased by 50.51 %, 63.89 %, and 60.8 %, respectively. After 48 h incubation, MS-SiO₂-GN-SR still maintained the best antifouling performance. These results suggest that physical antifouling strategies based on macroscopic gaseous plastron are promising for the marine industry and maritime transport.

{"title":"Biomimetic gaseous plastron for blocking fouling-associated biological colonization","authors":"Hao Fu, Minghao Cai, Peijun Liao, Wei Bing","doi":"10.1016/j.colsurfa.2024.135856","DOIUrl":"10.1016/j.colsurfa.2024.135856","url":null,"abstract":"<div><div>Surface micro-/nanostructures and wettability play important roles in gaseous plastron stability. Inspired by the structure and function of <em>Salvinia</em> and lotus leaf, the microstructure-silicon dioxide-graphene-silicone rubber (MS-SiO<sub>2</sub>-GN-SR) composites with bubble trapping ability were synthesized. MS-SiO<sub>2</sub>-GN-SR can rapidly adsorb a large number of air bubbles under water to form a large gaseous plastron, which can be used as an antifouling barrier to prevent microbial invasion. MS-SiO<sub>2</sub>-GN-SR has a strong bubble adsorption function due to its superhydrophobicity and surface roughness. Under dynamic conditions, compared with GN-SR, the adhesion of Gram-negative bacteria, Gram-positive bacteria, and marine algae attachment on the surface of MS-SiO<sub>2</sub>-GN-SR decreased by 50.51 %, 63.89 %, and 60.8 %, respectively. After 48 h incubation, MS-SiO<sub>2</sub>-GN-SR still maintained the best antifouling performance. These results suggest that physical antifouling strategies based on macroscopic gaseous plastron are promising for the marine industry and maritime transport.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135856"},"PeriodicalIF":4.9,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098888","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}

引用次数: 0

Study on improving the performance of engineered cement-based composites by modifying binder system and polyethylene fiber/matrix interface 通过改性粘结剂体系和聚乙烯纤维/基体界面改善工程水泥基复合材料性能的研究

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-29 DOI: 10.1016/j.colsurfa.2024.135862

Qichang Fan , Yuanyuan Zheng , Dan Meng , Qun Guo , Yiming Liu , Haoliang Wu

In this study, cement, rice husk ash (RHA), silica fume, mineral powder and fly ash were used as multi-component cementing materials, and the polyethylene (PE) fiber was modified by cellulose nanocrystal (CNC) to develop an Engineered Cementitious Composites (ECC) with high ductility and strength. The hydration heat and X-ray diffractometer (XRD) results indicate that RHA delays the early hydration of cement, its pozzolanic effect refines the internal porosity of hydration matrix and improves the compactness of ECC samples. Moreover, RHA increases the interfacial properties between fiber and cement matrix, reduces the first cracking strength and significantly improves the tensile strain rate of ECC. With the increasing content of RHA, its reinforcement effect becomes more obviously. The strain rate of ECC samples that uses RHA to replace 40 % of cement can reach 6.81 %. However, once the content of RHA is too high, the quality of cement involved in hydration will be significantly weakened, which reduces the amount of hydration products and has a negative impact on the compressive strength. By CNC coating, the active groups can be coated to the fiber surface to improve the fiber’s wettability. Which has promoted the growth of hydration products on the fiber surface, enhancing the fiber/matrix interface properties, and improved the ductility of ECC. CNC coating can also make up for the loss of compressive strength caused by RHA. The molecular dynamics simulation results show that unmodified PE fiber hardly to form a stable bond with C-S-H. However, CNC can adsorb with C-S-H through hydrogen and Ca-O bonding, and can also interaction with PE fiber by hydrogen bonding. Herein, CNC acts as an intermediate to connect PE and C-S-H, increase the interface stability of fiber/cement matrix, improve the interface bonding, and thus enhance the ductility of ECC. Developing multi-binder system and reinforced fiber/interface can significantly reduce the amount of cement used in ECC, and understanding the enhancement mechanism is beneficial to guide the optimal design of ECC.

本研究以水泥、稻壳灰（RHA）、硅灰、矿物粉和粉煤灰为多组分胶凝材料，对聚乙烯（PE）纤维进行纤维素纳米晶（CNC）改性，制备出具有高延性和高强度的工程胶凝复合材料（ECC）。水化热和x射线衍射（XRD）结果表明，RHA延缓了水泥的早期水化，其火山灰效应细化了水化基质内部孔隙度，提高了ECC样品的密实度。此外，RHA增加了纤维与水泥基体之间的界面性能，降低了首次开裂强度，显著提高了ECC的拉伸应变率。随着RHA含量的增加，其加固作用更加明显。采用RHA替代40% %水泥的ECC试样应变率可达6.81 %。然而，一旦RHA含量过高，参与水化的水泥质量将明显减弱，从而减少水化产物的数量，对抗压强度产生负面影响。通过CNC涂层，可以将活性基团涂覆在纤维表面，提高纤维的润湿性。这促进了水化产物在纤维表面的生长，增强了纤维/基体界面性能，提高了ECC的延展性。CNC涂层还可以弥补RHA造成的抗压强度损失。分子动力学模拟结果表明，未经改性的PE纤维很难与C-S-H形成稳定的键。CNC可以通过氢键和Ca-O键吸附C-S-H，也可以通过氢键与PE纤维相互作用。其中CNC作为连接PE和C-S-H的中间体，增加纤维/水泥基体的界面稳定性，改善界面粘结，从而增强ECC的延展性。开发多粘结剂体系和增强纤维/界面可以显著减少水泥在ECC中的用量，了解增强机理有助于指导ECC的优化设计。

{"title":"Study on improving the performance of engineered cement-based composites by modifying binder system and polyethylene fiber/matrix interface","authors":"Qichang Fan , Yuanyuan Zheng , Dan Meng , Qun Guo , Yiming Liu , Haoliang Wu","doi":"10.1016/j.colsurfa.2024.135862","DOIUrl":"10.1016/j.colsurfa.2024.135862","url":null,"abstract":"<div><div>In this study, cement, rice husk ash (RHA), silica fume, mineral powder and fly ash were used as multi-component cementing materials, and the polyethylene (PE) fiber was modified by cellulose nanocrystal (CNC) to develop an Engineered Cementitious Composites (ECC) with high ductility and strength. The hydration heat and X-ray diffractometer (XRD) results indicate that RHA delays the early hydration of cement, its pozzolanic effect refines the internal porosity of hydration matrix and improves the compactness of ECC samples. Moreover, RHA increases the interfacial properties between fiber and cement matrix, reduces the first cracking strength and significantly improves the tensile strain rate of ECC. With the increasing content of RHA, its reinforcement effect becomes more obviously. The strain rate of ECC samples that uses RHA to replace 40 % of cement can reach 6.81 %. However, once the content of RHA is too high, the quality of cement involved in hydration will be significantly weakened, which reduces the amount of hydration products and has a negative impact on the compressive strength. By CNC coating, the active groups can be coated to the fiber surface to improve the fiber’s wettability. Which has promoted the growth of hydration products on the fiber surface, enhancing the fiber/matrix interface properties, and improved the ductility of ECC. CNC coating can also make up for the loss of compressive strength caused by RHA. The molecular dynamics simulation results show that unmodified PE fiber hardly to form a stable bond with C-S-H. However, CNC can adsorb with C-S-H through hydrogen and Ca-O bonding, and can also interaction with PE fiber by hydrogen bonding. Herein, CNC acts as an intermediate to connect PE and C-S-H, increase the interface stability of fiber/cement matrix, improve the interface bonding, and thus enhance the ductility of ECC. Developing multi-binder system and reinforced fiber/interface can significantly reduce the amount of cement used in ECC, and understanding the enhancement mechanism is beneficial to guide the optimal design of ECC.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135862"},"PeriodicalIF":4.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745554","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}

引用次数: 0

In-situ formation of molybdenum disulfide nanoparticle and its catalytic performance in heavy oil long-term aquathermolysis

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-29 DOI: 10.1016/j.colsurfa.2024.135861

Jiqian Wang , Kang Gao , Yuchen Zhong , Jun Nan , Xiongfei Li , Hongzuo Zhao , Chen Ma , Zhichao Zhou , Binfei Li , Yongming Chai

Heavy oil is an important unconventional petroleum resource due to its abundant reserve, but the reduction of viscosity is a prerequisite for its effective exploitation. Researchers are trying to develop heavy oil catalytic aquathermolysis technologies for their merit of irreversible viscosity reduction through in-situ upgrading. The key point of catalytic aquathermolysis is the in-situ formation of high active catalytic phase. In this study, we have demonstrated that the precursor (NH₄)₂MoS₄ was fully decomposed into MoS₂ nanoparticles at relatively low temperature of 200°C after 90 minutes. The decomposition of (NH₄)₂MoS₄ in aquathermolysis was significantly different from its decomposition process under hydrogen and vacuum atmospheres. The laboratory experimental results showed that the heavy oil viscosity reduction rate was above 85 % with the action of in- situ formed MoS₂ nanoparticles after aquathermolysis. The sulfur content of heavy oil and asphaltene, asphaltenes and aromatics contents of heavy oil were decreased significantly, indicating that the cracking and ring opening reactions did take place. In the oilfield experiment, the precursor (NH₄)₂MoS₄ was injected into the reservoir along with steam. After one-time injection, the catalytic effect could be sustained for at least four months. The maximum viscosity reduction rate was as high as 90 % during the first week, and still around 70 % in the 4th month. The molecular structural analysis of the produced heavy oil proved that the asphaltenes has been effectively cracked during the in-situ catalytic aquathermolysis. Both the laboratory and oilfield experimental results demonstrated that (NH₄)₂MoS₄ precursor could form MoS₂ nanoparticle and effectively catalyze the upgrading reactions of heavy oil. We hope that this study will provide a new catalyst development strategy for the catalytic aquathermolysis exploitation technology of heavy oil.

{"title":"In-situ formation of molybdenum disulfide nanoparticle and its catalytic performance in heavy oil long-term aquathermolysis","authors":"Jiqian Wang , Kang Gao , Yuchen Zhong , Jun Nan , Xiongfei Li , Hongzuo Zhao , Chen Ma , Zhichao Zhou , Binfei Li , Yongming Chai","doi":"10.1016/j.colsurfa.2024.135861","DOIUrl":"10.1016/j.colsurfa.2024.135861","url":null,"abstract":"<div><div>Heavy oil is an important unconventional petroleum resource due to its abundant reserve, but the reduction of viscosity is a prerequisite for its effective exploitation. Researchers are trying to develop heavy oil catalytic aquathermolysis technologies for their merit of irreversible viscosity reduction through in-situ upgrading. The key point of catalytic aquathermolysis is the in-situ formation of high active catalytic phase. In this study, we have demonstrated that the precursor (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> was fully decomposed into MoS<sub>2</sub> nanoparticles at relatively low temperature of 200°C after 90 minutes. The decomposition of (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> in aquathermolysis was significantly different from its decomposition process under hydrogen and vacuum atmospheres. The laboratory experimental results showed that the heavy oil viscosity reduction rate was above 85 % with the action of in- situ formed MoS<sub>2</sub> nanoparticles after aquathermolysis. The sulfur content of heavy oil and asphaltene, asphaltenes and aromatics contents of heavy oil were decreased significantly, indicating that the cracking and ring opening reactions did take place. In the oilfield experiment, the precursor (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> was injected into the reservoir along with steam. After one-time injection, the catalytic effect could be sustained for at least four months. The maximum viscosity reduction rate was as high as 90 % during the first week, and still around 70 % in the 4th month. The molecular structural analysis of the produced heavy oil proved that the asphaltenes has been effectively cracked during the in-situ catalytic aquathermolysis. Both the laboratory and oilfield experimental results demonstrated that (NH<sub>4</sub>)<sub>2</sub>MoS<sub>4</sub> precursor could form MoS<sub>2</sub> nanoparticle and effectively catalyze the upgrading reactions of heavy oil. We hope that this study will provide a new catalyst development strategy for the catalytic aquathermolysis exploitation technology of heavy oil.</div></div>","PeriodicalId":278,"journal":{"name":"Colloids and Surfaces A: Physicochemical and Engineering Aspects","volume":"707 ","pages":"Article 135861"},"PeriodicalIF":4.9,"publicationDate":"2024-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143098890","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}

引用次数: 0

Towards remarkable corrosion protection by synergizing PANI with plasma-electrolyzed inorganic layer

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-29 DOI: 10.1016/j.colsurfa.2024.135863

T. Suhartono , M.P. Kamil , Y.G. Ko

Notwithstanding the increasing interest in the enhancement of the corrosion properties of active metallic materials, the role of organic corrosion barrier remains insufficiently understood with respect to the formation of structural microdefects in the inorganic layer and the decrease in the corrosion rate. The present work proposed the mechanism by which an organic polymer would improve the barrier properties of the defective TiO₂ coating as an inorganic layer and thereby, improve corrosion protection. This protection mechanism enhances the hydrophobicity of the TiO₂ surface because of the notable homogeneity of the organic polymer polyaniline (PANI). The adsorption of PANI on the surface of the TiO₂ coating was verified using SEM and EDAX. The electrochemical performance was enhanced remarkably because of the integral synergy between TiO₂ and PANI in the composite, which could be controlled by adjusting the number of deposition cycles. In addition, the novel protection mechanism of this hybrid layer was based on the counter anions stored within PANI. These were released as active corrosion inhibitors upon the onset of a severe chemical attack on the TiO₂ layer or metal substrate. Thus, these composites reduced the diffusion of metal ions and prevented the penetration of corrosive ions, thereby yielding a remarkable corrosion resistance.

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引用次数: 0

Toxic gas molecules adsorbed on the original and metal-doped two-dimensional s-C3N4: A first-principles investigation 有毒气体分子吸附在原始和金属掺杂的二维s-C3N4：第一性原理的研究

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-28 DOI: 10.1016/j.colsurfa.2024.135860

Lanyin Liu , Yao Tong , Xinghong Cai , Min Wang

We theoretically investigate toxic gas molecules including CO, NO, NO₂, SO₂, and H₂S adsorbed on the original s-C₃N₄ and Cu, V and Fe-doped s-C₃N₄. V- and Cu-doped s-C₃N₄ structures have the semiconductor-to-conductor transitions. All the gas molecules prefer to be adsorbed on the metal-doped s-C₃N₄ than the pristine one. In addition, it also reveals that both original and metal-doped s-C₃N₄ materials provide better adsorption performance than most reported C_xN_y ones. The ab initio molecular dynamics simulations illustrate that Cu-doped s-C₃N₄ obtain the capacity for the decomposition of H₂S at 500 K. Similar decomposition of NO₂, SO₂ and H₂S by Cu-doped s-C₃N₄, and NO₂ and H₂S by Fe-doped s-C₃N₄ could also be observed. The other molecules could desorb from metal-doped s-C₃N₄. In addition, the metal atoms selected for the metal-doped s-C₃N₄ are economically advantageous. Thus, the cheap-metal-doped s-C₃N₄ shows good gas adsorption and decomposition capacity, and these studies may provide insights for the applications of metal-doped s-C₃N₄.

我们从理论上研究了CO， NO, NO2， SO2和H2S等有毒气体分子吸附在原始s-C3N4和Cu， V和fe掺杂的s-C3N4上。V和cu掺杂的s-C3N4结构具有半导体到导体的转变。所有气体分子都倾向于吸附在金属掺杂的s-C3N4上，而不是原始的s-C3N4。此外，研究还表明，无论是原始材料还是掺杂金属的s-C3N4材料，其吸附性能都优于大多数报道的CxNy材料。从头算分子动力学模拟表明，掺杂cu的s-C3N4在500 K下具有分解H2S的能力。铜掺杂s-C3N4对NO2、SO2和H2S的分解也类似，铁掺杂s-C3N4对NO2和H2S的分解也类似。其他分子可以从金属掺杂的s-C3N4中解吸。此外，选择金属掺杂s-C3N4的金属原子具有经济上的优势。因此，廉价的金属掺杂s-C3N4表现出良好的气体吸附和分解能力，这些研究可能为金属掺杂s-C3N4的应用提供见解。

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引用次数: 0

Unveiling molecular alignment, dielectric and electrical conductivity of an unaligned 4-octyl-4′-cyanobiphenyl liquid crystal doped with carbon dots 揭示了掺杂碳点的4-辛基-4′-氰联苯液晶的分子取向、介电和电导率

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-28 DOI: 10.1016/j.colsurfa.2024.135854

Priscilla P , Michael R. Fisch , Sandeep Kumar , Arvind K. Gathania , Jai Prakash , Supreet , Sanjeev Kumar , Riccardo Castagna , Gautam Singh

We report the achievement of vertical alignment in the smectic A (SmA) and nematic (N) phases of a 4-octyl-4′-cyanobiphenyl (8CB) LC doped with carbon dots (CDs, ∼2.8±0.72 nm) at concentrations ≤ 0.3 wt%. The composites were filled in indium tin oxide (ITO) sample cells without alignment layer (i.e., ITOWAL cells) and characterized using polarizing optical microscope and dielectric spectroscopic techniques. Optical textures displayed the attainment of induced vertical alignment (dark optical texture) even for the lowest concentration of 0.03 wt% used in the experiments. The enhanced dark state was observed with increasing concentration of up to 0.3 wt%. This was also verified by measuring the real dielectric permittivity (εʹ) of the composites. For instance, at 25ºC the value of εʹ for 0.03 wt% composite was 12.6 which increased to 14.8 for 0.3 wt% composite demonstrating the better vertical alignment. The appearance of short axis molecular relaxation in the dielectric loss (ε ̋) of all composites was another confirmation of induced vertical alignment. Measurements at various temperatures show that the induced vertical alignment remains stable throughout the SmA and N phases of 8CB. Additionally, bias voltage studies were conducted to assess the implication of an aligning voltage on εʹ and ε ̋. Electrical conductivity was calculated from ε ̋ and for the highest concentration, an increase of two orders of magnitude in the dc conductivity (σ_dc) compared to a polyimide alignment layer vertically aligned pure 8CB sample. The conductivity exhibited Arrhenius behavior for all composites. This work demonstrates that CDs induced vertical alignment in both SmA, and N phases could replace the conventional alignment techniques required to obtain the vertical alignment of LC materials. Moreover, these composites could pave the way forward for the fabrication of sensors and other optical devices due to their thermally stable alignment.

我们报道了在浓度≤0.3 wt%时，掺杂碳点（CDs, ~ 2.8±0.72 nm）的4-辛基-4 ' -氰联苯（8CB） LC在近晶A （SmA）和向列相(N)中实现垂直排列。将复合材料填充在没有对准层的氧化铟锡（ITO）样品电池（即ITOWAL电池）中，并使用偏光显微镜和介电光谱技术对其进行了表征。即使在实验中使用的最低浓度为0.03 wt%时，光学纹理也显示出诱导垂直排列（暗光学纹理）的实现。当浓度增加到0.3 wt%时，观察到暗态增强。这也通过测量复合材料的实际介电常数（ε′）得到了验证。例如，在25ºC时，0.03 wt%复合材料的ε′值为12.6,0.3 wt%复合材料的ε′值增加到14.8，显示出更好的垂直排列。在所有复合材料的介电损耗（ε ）中出现短轴分子弛豫，再次证实了诱导垂直取向。在不同温度下的测量表明，在8CB的SmA和N相中，诱导的垂直排列保持稳定。此外，还进行了偏置电压研究，以评估对准电压对ε′和ε′的影响。电导率由ε - 计算得到，在最高浓度下，与聚酰亚胺取向层垂直取向的纯8CB样品相比，直流电导率（σdc）提高了两个数量级。所有复合材料的电导率均表现出阿伦尼乌斯行为。这项工作表明，CDs诱导SmA和N相的垂直排列可以取代获得LC材料垂直排列所需的传统排列技术。此外，由于这些复合材料的热稳定性，它们可以为传感器和其他光学器件的制造铺平道路。

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引用次数: 0

Study of 2D layered nickel pyrophosphate using 3D Bode mapping and stability forecasting for supercapacitors

IF 4.9 2区化学 Q2 CHEMISTRY, PHYSICAL

Colloids and Surfaces A: Physicochemical and Engineering Aspects

Pub Date : 2024-11-28 DOI: 10.1016/j.colsurfa.2024.135829

Satyajeet S. Patil , Akhilesh P. Patil , Rahul S. Redekar , Shweta M. Pawar , Nilesh L. Tarwal , Pramod S. Patil

In recent years, layered materials have gained attention in energy storage application due to their high surface to volume ratio and stable nanoarchitecture. Herein, 2D layered nickel pyrophosphate (NP) is synthesized using the hydrothermal method. The effect of annealing temperature on the electrochemical performance of the NP is discussed. Various physicochemical characterizations of the NP are carried out to understand its features. XRD confirms the NP phase of the material with the monoclinic crystal structure. Rietveld analysis is carried out to understand the structural parameters of the NP. FE-SEM shows the uniformity of 2D layered and highly porous microsheet like morphology in NP material. The detailed charge storage dynamics is analyzed using different electrochemical parameters like standard rate constant, charge transfer and diffusion coefficient. Moreover, the 3D Bode mapping measurements are carried out to obtain the in charge conduction in depth. The NP electrode shows a specific capacitance of 16382.40 mF/cm² (1820.26 µAh/cm²) at a 10 mA/cm² current density. The cyclic stability shows 99.98 % capacitance retention after 4240 cycles. Time series analysis is used to predict and forecast the cyclic stability data. Furthermore, an aqueous hybrid SC shows a specific capacitance of 667.32 mF/cm² (259.51 µAh/cm²) at a current density of 10 mA/cm² with energy and power density of 181.66 µWh/cm² and 6.48 mW/cm². All the characterization results suggest that NP can be a potential candidate for SCs.

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引用次数: 0