Pub Date : 2025-02-01DOI: 10.1016/j.nanoms.2024.02.012
Zhenqi Wang , Zhuomin Zhang , Zehua Peng , Xiaodan Yang , Xuemu Li , Yao Shan , Bingren Liu , Xiaote Xu , Yongsheng Gao , Zhengbao Yang
The mass discarding face masks has caused severe environmental problems during and after the COVID-19 pandemic. To reduce waste and minimize environmental impact, we present a new face mask featuring self-charging extended service time and fully biodegradable materials. To extend the effective service time, we need to supplement the lost electric charge of the electret layer of face masks, for which task we propose to use the piezoelectric effect and generate electricity from breathing motions. However, existing piezoelectric materials are either toxic, impermeable, rigid, costly, or non-degradable. We synthesize a fully biodegradable piezoelectric membrane composed of polyvinyl alcohol (PVA) and glycine (GLY) via the electrospinning process. Parameters are accurately controlled to ensure that glycine crystallizes into a highly piezoelectric β phase during electrospinning and enables piezoelectric responses of the filter membrane. Tested with the standard 0.3 particles, face masks made of the PVA-GLY membrane show an outstanding filtration efficiency of 97%, which remains stable over at least 10 h of high-concentration continuous filtration. Furthermore, we demonstrated the biodegradability of PVA-GLY masks, which can degrade completely within a few weeks, compared to commonly used surgical masks requiring over thirty years to be decomposed.
{"title":"Self-charging and long-term face masks leveraging low-cost, biodegradable and sustainable piezoelectric nanofiber membrane","authors":"Zhenqi Wang , Zhuomin Zhang , Zehua Peng , Xiaodan Yang , Xuemu Li , Yao Shan , Bingren Liu , Xiaote Xu , Yongsheng Gao , Zhengbao Yang","doi":"10.1016/j.nanoms.2024.02.012","DOIUrl":"10.1016/j.nanoms.2024.02.012","url":null,"abstract":"<div><div>The mass discarding face masks has caused severe environmental problems during and after the COVID-19 pandemic. To reduce waste and minimize environmental impact, we present a new face mask featuring self-charging extended service time and fully biodegradable materials. To extend the effective service time, we need to supplement the lost electric charge of the electret layer of face masks, for which task we propose to use the piezoelectric effect and generate electricity from breathing motions. However, existing piezoelectric materials are either toxic, impermeable, rigid, costly, or non-degradable. We synthesize a fully biodegradable piezoelectric membrane composed of polyvinyl alcohol (PVA) and glycine (GLY) via the electrospinning process. Parameters are accurately controlled to ensure that glycine crystallizes into a highly piezoelectric β phase during electrospinning and enables piezoelectric responses of the filter membrane. Tested with the standard 0.3 <span><math><mrow><mi>μ</mi><mi>m</mi></mrow></math></span> particles, face masks made of the PVA-GLY membrane show an outstanding filtration efficiency of 97%, which remains stable over at least 10 h of high-concentration continuous filtration. Furthermore, we demonstrated the biodegradability of PVA-GLY masks, which can degrade completely within a few weeks, compared to commonly used surgical masks requiring over thirty years to be decomposed.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"7 1","pages":"Pages 113-122"},"PeriodicalIF":9.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140400229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The field of photocatalysis has witnessed a significant advancement in the development of bioinspired and biomimetic photocatalysts for various biomedical applications, including drug delivery, tissue engineering, cancer therapy, and bioimaging. Nature has evolved efficient light-harvesting systems and energy conversion mechanisms, which serve as a benchmark for researchers. However, reproducing such complexity and harnessing it for biomedical applications is a daunting task. It requires a comprehensive understanding of the underlying biological processes and the ability to replicate them synthetically. By utilizing light energy, these photocatalysts can trigger specific chemical reactions, leading to targeted drug release, enhanced tissue regeneration, and precise imaging of biological structures. In this context, addressing the stability, long-term performance, scalability, and cost-effectiveness of these materials is crucial for their widespread implementation in biomedical applications. While challenges such as complexity and stability persist, their advantages such as targeted drug delivery and personalized medicine make them a fascinating area of research. The purpose of this review is to provide a comprehensive analysis and evaluation of existing research, highlighting the advancements, current challenges, advantages, limitations, and future prospects of bioinspired and biomimetic photocatalysts in biomedicine.
{"title":"Inspired by nature: Bioinspired and biomimetic photocatalysts for biomedical applications","authors":"Ashkan Bigham , Atefeh Zarepour , Moein Safarkhani , YunSuk Huh , Arezoo Khosravi , Navid Rabiee , Siavash Iravani , Ali Zarrabi","doi":"10.1016/j.nanoms.2024.02.006","DOIUrl":"10.1016/j.nanoms.2024.02.006","url":null,"abstract":"<div><div>The field of photocatalysis has witnessed a significant advancement in the development of bioinspired and biomimetic photocatalysts for various biomedical applications, including drug delivery, tissue engineering, cancer therapy, and bioimaging. Nature has evolved efficient light-harvesting systems and energy conversion mechanisms, which serve as a benchmark for researchers. However, reproducing such complexity and harnessing it for biomedical applications is a daunting task. It requires a comprehensive understanding of the underlying biological processes and the ability to replicate them synthetically. By utilizing light energy, these photocatalysts can trigger specific chemical reactions, leading to targeted drug release, enhanced tissue regeneration, and precise imaging of biological structures. In this context, addressing the stability, long-term performance, scalability, and cost-effectiveness of these materials is crucial for their widespread implementation in biomedical applications. While challenges such as complexity and stability persist, their advantages such as targeted drug delivery and personalized medicine make them a fascinating area of research. The purpose of this review is to provide a comprehensive analysis and evaluation of existing research, highlighting the advancements, current challenges, advantages, limitations, and future prospects of bioinspired and biomimetic photocatalysts in biomedicine.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"7 1","pages":"Pages 1-23"},"PeriodicalIF":9.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140282540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.nanoms.2024.02.008
Adewale Hammed Pasanaje, Nirpendra Singh
The discovery of novel materials with compelling properties is more accessible with the help of advanced computational algorithms. Recent experimental synthesis of the biphenylene network (C6) motivated us to discover new BN-doped biphenylene networks (C4BN, C2B2N2, and B4N4) and their applications in Li(K)-ion batteries using an evolutionary algorithm and the first-principles calculations. The thermodynamic, thermal, and mechanical stability calculations and decomposition energy suggest the experimental synthesis of predicted biphenylene networks. Adding BN in the biphenylene networks shows a transition from metal to semimetal to semiconductor. The BN biphenylene network shows an HSE06 band gap of 3.06 eV, smaller than h-BN. The C4BN and C2B2N2 biphenylene networks offer Li(K) adsorption energy of −0.56 eV (−0.81 eV) and −0.14 eV (−0.28 eV), respectively, with a low diffusion barrier of 178 meV (58 meV) and 251 meV (79 meV), and a large diffusion constant of 8.50 × 10−5 (8.78 × 10−3 ) and 5.33 × 10−6 (4.12 × 10−3 ), respectively. The calculated Li(K) theoretical capacity of C4BN and C2B2N2 biphenylene networks is 940.21 mA h g−1 (899.01 mA h g−1) and 768.08 mA h g−1 (808.47 mA h g−1), with a low open circuit voltage of 0.34 V (0.23 V), and 0.17 V (0.13 V), resulting in very high energy density of 2576.18 mW h g−1 (2445.31 mW h g−1) and 2181.35 mW h g−1 (2263.72 mW h g−1), respectively. Only a slight volume change of 1.6% confirms the robustness of BN-doped carbon-based biphenylene networks. Our findings present novel 2D BN-doped biphenylene networks and a pathway toward their applications in metal-ion batteries.
在先进计算算法的帮助下，更容易发现具有引人注目特性的新型材料。最近联苯网络（C）的实验合成促使我们利用进化算法和第一原理计算发现了新的掺杂 BN 的联苯网络（CBN、CBN 和 BN）及其在锂离子电池中的应用。热力学、热和机械稳定性计算以及分解能表明，可以通过实验合成所预测的联苯网络。在联苯网络中加入 BN 后，会出现从金属到半金属再到半导体的转变。BN 联苯网络的 HSE06 带隙为 3.06 eV，小于 -BN。CBN 和 CBN 联苯网络对 Li(K) 的吸附能分别为 -0.56 eV (-0.81 eV) 和 -0.14 eV (-0.28 eV)，扩散势垒分别为 178 meV (58 meV) 和 251 meV (79 meV)，扩散常数分别为 8.50 × 10 (8.78 × 10) 和 5.33 × 10 (4.12 × 10)。计算得出的 CBN 和 CBN 联苯网络的 Li(K) 理论容量分别为 940.21 mA h g（899.01 mA h g）和 768.08 mA h g（808.47 mA h g），低开路电压为 0.34 V (0.23 V) 和 0.17 V (0.13 V)，能量密度分别高达 2576.18 mW h g (2445.31 mW h g) 和 2181.35 mW h g (2263.72 mW h g)。仅 1.6% 的微小体积变化证实了掺杂 BN 的碳基联苯网络的稳健性。我们的研究结果展示了新型二维 BN 掺杂联苯网络及其在金属离子电池中的应用途径。
{"title":"Evolutionary prediction of novel biphenylene networks as an anode material for lithium and potassium-ion batteries","authors":"Adewale Hammed Pasanaje, Nirpendra Singh","doi":"10.1016/j.nanoms.2024.02.008","DOIUrl":"10.1016/j.nanoms.2024.02.008","url":null,"abstract":"<div><div>The discovery of novel materials with compelling properties is more accessible with the help of advanced computational algorithms. Recent experimental synthesis of the biphenylene network (C<sub>6</sub>) motivated us to discover new BN-doped biphenylene networks (C<sub>4</sub>BN, C<sub>2</sub>B<sub>2</sub>N<sub>2</sub>, and B<sub>4</sub>N<sub>4</sub>) and their applications in Li(K)-ion batteries using an evolutionary algorithm and the first-principles calculations. The thermodynamic, thermal, and mechanical stability calculations and decomposition energy suggest the experimental synthesis of predicted biphenylene networks. Adding BN in the biphenylene networks shows a transition from metal to semimetal to semiconductor. The BN biphenylene network shows an HSE06 band gap of 3.06 eV, smaller than <em>h</em>-BN. The C<sub>4</sub>BN and C<sub>2</sub>B<sub>2</sub>N<sub>2</sub> biphenylene networks offer Li(K) adsorption energy of −0.56 eV (−0.81 eV) and −0.14 eV (−0.28 eV), respectively, with a low diffusion barrier of 178 meV (58 meV) and 251 meV (79 meV), and a large diffusion constant of 8.50 × 10<sup>−5</sup> <span><math><mrow><msup><mtext>cm</mtext><mn>2</mn></msup><mo>/</mo><mi>s</mi></mrow></math></span> (8.78 × 10<sup>−3</sup> <span><math><mrow><msup><mtext>cm</mtext><mn>2</mn></msup><mo>/</mo><mi>s</mi></mrow></math></span>) and 5.33 × 10<sup>−6</sup> <span><math><mrow><msup><mtext>cm</mtext><mn>2</mn></msup><mo>/</mo><mi>s</mi></mrow></math></span> (4.12 × 10<sup>−3</sup> <span><math><mrow><msup><mtext>cm</mtext><mn>2</mn></msup><mo>/</mo><mi>s</mi></mrow></math></span>), respectively. The calculated Li(K) theoretical capacity of C<sub>4</sub>BN and C<sub>2</sub>B<sub>2</sub>N<sub>2</sub> biphenylene networks is 940.21 mA h g<sup>−1</sup> (899.01 mA h g<sup>−1</sup>) and 768.08 mA h g<sup>−1</sup> (808.47 mA h g<sup>−1</sup>), with a low open circuit voltage of 0.34 V (0.23 V), and 0.17 V (0.13 V), resulting in very high energy density of 2576.18 mW h g<sup>−1</sup> (2445.31 mW h g<sup>−1</sup>) and 2181.35 mW h g<sup>−1</sup> (2263.72 mW h g<sup>−1</sup>), respectively. Only a slight volume change of 1.6% confirms the robustness of BN-doped carbon-based biphenylene networks. Our findings present novel 2D BN-doped biphenylene networks and a pathway toward their applications in metal-ion batteries.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"7 1","pages":"Pages 83-89"},"PeriodicalIF":9.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140155123","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.nanoms.2024.02.011
Jun Zhang , Pingjuan Liang , Xinlan Xu , Rong Wang , Shuyue Liu , Chunyuan Wang , Boyu Liu , Laizheng Luo , Meng Jin , Huan Liu , Huan Yi , Shi-Yu Lu
The development of efficient and durable electrocatalysts for oxygen reduction reaction (ORR) holds a pivotal significance in the successful commercialization of proton exchange membrane fuel cells (PEMFCs) but is still challenging. Herein, we report a worm-liked PtCu nanocrystals dispersed on nitrogen-doped carbon hollow microspheres (Pt0.38Cu0.62/N-HCS). Benefiting from its structural and compositional advantages, the resulting Pt0.38Cu0.62/N-HCS catalyst delivers exceptional electrocatalytic activity for ORR, with a half-wave potential (E1/2) of 0.837 V, a mass activity of 0.672 A mgPt-1, and a Tafel slope of 50.66 mV dec-1, surpassing that of commercial Pt/C. Moreover, the Pt0.38Cu0.62/N-HCS follows the desired four-electron transfer mechanism throughout the ORR process, thereby displaying a high selectivity for direct reduction of O2 to H2O. Remarkably, this catalyst also showcases high stability, with only a 25 mV drop in E1/2 after 10,000 cycles in an acidic electrolyte. Theoretical calculations elucidate the incorporation of Cu into Pt lattice induces compressive strain, which effectively tailors the d band center of Pt active sites and strengthens the surface chemisorption of O2 molecules on PtCu alloys. Consequently, the Pt0.38Cu0.62/N-HCS catalyst exhibits an improved ability to adsorb O2 molecules on its surface, accelerating the reaction kinetics of O2 conversion to ∗OOH. Additionally, Cu atoms, not only serving as sacrificial anode, undergo preferential oxidation during PEMFCs operation when compared to Pt, but also the stable Cu species in PtCu alloys contributes significantly to maintaining the strain effect, collectively enhancing both activity and durability. Overall, this research offers an effective and promising approach to enhance the activity and stability of Pt-based ORR electrocatalysts in PEMFCs.
开发高效、耐用的氧还原反应电催化剂对质子交换膜燃料电池（pemfc）的成功商业化具有关键意义，但仍具有挑战性。本文报道了一种分散在氮掺杂碳空心微球（Pt0.38Cu0.62/N-HCS）上的蠕虫状PtCu纳米晶体。得益于其结构和组成优势，所制得的Pt0.38Cu0.62/N-HCS催化剂具有出色的ORR电催化活性，其半波电位（E1/2）为0.837 V，质量活性为0.672 a mgPt-1， Tafel斜率为50.66 mV dec1，超过了商用Pt/C。此外，Pt0.38Cu0.62/N-HCS在整个ORR过程中遵循理想的四电子转移机制，因此对O2直接还原为H2O具有很高的选择性。值得注意的是，该催化剂还显示出高稳定性，在酸性电解质中循环10,000次后，E1/2仅下降25 mV。理论计算表明，Cu与Pt晶格的结合引起压缩应变，有效地调整了Pt活性位点的d带中心，增强了PtCu合金表面O2分子的化学吸附。因此，Pt0.38Cu0.62/N-HCS催化剂表现出更好的表面吸附O2分子的能力，加速了O2转化为* OOH的反应动力学。此外，与Pt相比，Cu原子不仅作为牺牲阳极，在PEMFCs运行过程中优先氧化，而且PtCu合金中稳定的Cu物质也有助于维持应变效应，共同提高活性和耐用性。综上所述，本研究为提高pemfc中基于pt的ORR电催化剂的活性和稳定性提供了一种有效且有前景的方法。
{"title":"Synergy of compress strain and antioxidant of platinum-copper for enhanced the oxygen reduction performance","authors":"Jun Zhang , Pingjuan Liang , Xinlan Xu , Rong Wang , Shuyue Liu , Chunyuan Wang , Boyu Liu , Laizheng Luo , Meng Jin , Huan Liu , Huan Yi , Shi-Yu Lu","doi":"10.1016/j.nanoms.2024.02.011","DOIUrl":"10.1016/j.nanoms.2024.02.011","url":null,"abstract":"<div><div>The development of efficient and durable electrocatalysts for oxygen reduction reaction (ORR) holds a pivotal significance in the successful commercialization of proton exchange membrane fuel cells (PEMFCs) but is still challenging. Herein, we report a worm-liked PtCu nanocrystals dispersed on nitrogen-doped carbon hollow microspheres (Pt<sub>0.38</sub>Cu<sub>0.62</sub>/N-HCS). Benefiting from its structural and compositional advantages, the resulting Pt<sub>0.38</sub>Cu<sub>0.62</sub>/N-HCS catalyst delivers exceptional electrocatalytic activity for ORR, with a half-wave potential (E<sub>1/2</sub>) of 0.837 V, a mass activity of 0.672 A mg<sub>P</sub><sub>t</sub><sup>-1</sup>, and a Tafel slope of 50.66 mV dec<sup>-1</sup>, surpassing that of commercial Pt/C. Moreover, the Pt<sub>0.38</sub>Cu<sub>0.62</sub>/N-HCS follows the desired four-electron transfer mechanism throughout the ORR process, thereby displaying a high selectivity for direct reduction of O<sub>2</sub> to H<sub>2</sub>O. Remarkably, this catalyst also showcases high stability, with only a 25 mV drop in E<sub>1/2</sub> after 10,000 cycles in an acidic electrolyte. Theoretical calculations elucidate the incorporation of Cu into Pt lattice induces compressive strain, which effectively tailors the d band center of Pt active sites and strengthens the surface chemisorption of O<sub>2</sub> molecules on PtCu alloys. Consequently, the Pt<sub>0.38</sub>Cu<sub>0.62</sub>/N-HCS catalyst exhibits an improved ability to adsorb O<sub>2</sub> molecules on its surface, accelerating the reaction kinetics of O<sub>2</sub> conversion to ∗OOH. Additionally, Cu atoms, not only serving as sacrificial anode, undergo preferential oxidation during PEMFCs operation when compared to Pt, but also the stable Cu species in PtCu alloys contributes significantly to maintaining the strain effect, collectively enhancing both activity and durability. Overall, this research offers an effective and promising approach to enhance the activity and stability of Pt-based ORR electrocatalysts in PEMFCs.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"7 1","pages":"Pages 105-112"},"PeriodicalIF":9.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140276520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.nanoms.2024.03.005
Xuemin Kong , Xiaotong Fan , Yuhui Wang , Yunshu Luo , Yihang Chen , Tingzhu Wu , Zhong Chen , Yue Lin , Shuli Wang
The preparation of red, green, and blue quantum dot (QD) pixelated arrays with high precision, resolution, and brightness poses a significant challenge on the development of advanced micro-displays for virtual, augmented, and mixed reality applications. Alongside the controlled synthesis of high-performance QDs, a reliable QD patterning technology is crucial in overcoming this challenge. Among the various methods available, photolithography-based patterning technologies show great potentials in producing ultra-fine QD patterns at micron scale. This review article presents the recent advancements in the field of QD patterning using photolithography techniques and explores their applications in micro-display technology. Firstly, we discuss QD patterning through photolithography techniques employing photoresist (PR), which falls into two categories: PR-assisted photolithography and photolithography of QDPR. Subsequently, direct photolithography techniques based on photo-induced crosslinking of photosensitive groups and photo-induced ligand cleavage mechanisms are thoroughly reviewed. Meanwhile, we assess the performance of QD arrays fabricated using these photolithography techniques and their integration into QD light emitting diode display devices as well as color conversion-based micro light emitting diode display devices. Lastly, we summarize the most recent developments in this field and outline future prospects.
{"title":"Recent advances of photolithography patterning of quantum dots for micro-display applications","authors":"Xuemin Kong , Xiaotong Fan , Yuhui Wang , Yunshu Luo , Yihang Chen , Tingzhu Wu , Zhong Chen , Yue Lin , Shuli Wang","doi":"10.1016/j.nanoms.2024.03.005","DOIUrl":"10.1016/j.nanoms.2024.03.005","url":null,"abstract":"<div><div>The preparation of red, green, and blue quantum dot (QD) pixelated arrays with high precision, resolution, and brightness poses a significant challenge on the development of advanced micro-displays for virtual, augmented, and mixed reality applications. Alongside the controlled synthesis of high-performance QDs, a reliable QD patterning technology is crucial in overcoming this challenge. Among the various methods available, photolithography-based patterning technologies show great potentials in producing ultra-fine QD patterns at micron scale. This review article presents the recent advancements in the field of QD patterning using photolithography techniques and explores their applications in micro-display technology. Firstly, we discuss QD patterning through photolithography techniques employing photoresist (PR), which falls into two categories: PR-assisted photolithography and photolithography of QDPR. Subsequently, direct photolithography techniques based on photo-induced crosslinking of photosensitive groups and photo-induced ligand cleavage mechanisms are thoroughly reviewed. Meanwhile, we assess the performance of QD arrays fabricated using these photolithography techniques and their integration into QD light emitting diode display devices as well as color conversion-based micro light emitting diode display devices. Lastly, we summarize the most recent developments in this field and outline future prospects.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"7 1","pages":"Pages 49-64"},"PeriodicalIF":9.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140790514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The aim of this work is to find an alternative lubricating grease formulation that can be produced from renewable and biodegradable sources with minimal risks to human health and the environment. We used a castor oil and electrospun cellulose acetate propionate (CAp) as raw materials. We hypothesized that the acetyl and propionyl groups could provide an adequate chemical compatibility with the castor oil and that the electrospun nanostructures could enable improved physical stability by creating a variety of morphologies allowing the tailoring of the rheological and tribological properties of the resulting greases. The experimental results show that the use of electrospun CAp nanostructures can indeed yield physically stable formulations, even when used at low concentrations (3 wt%). The resulting dispersions went through structural transitions due to changes in the thickener morphologies and/or concentration, as shown by oscillatory rheology, oil holding capacity, tackiness, and lubrication performance in metal–metal contact. We found that the formulations, containing smooth or porous CAp nanofibers, at 5 wt% as a thickener, possess suitable rheological and tribological properties with a performance comparable to that of traditional lithium lubricating greases.
{"title":"Environmentally friendly tailor-made oleo-dispersions of electrospun cellulose acetate propionate nanostructures in castor oil for lubricant applications","authors":"M.A. Martín-Alfonso , J.F. Rubio-Valle , J.P. Hinestroza , J.E. Martín-Alfonso , J.M. Franco","doi":"10.1016/j.nanoms.2024.02.003","DOIUrl":"10.1016/j.nanoms.2024.02.003","url":null,"abstract":"<div><div>The aim of this work is to find an alternative lubricating grease formulation that can be produced from renewable and biodegradable sources with minimal risks to human health and the environment. We used a castor oil and electrospun cellulose acetate propionate (CAp) as raw materials. We hypothesized that the acetyl and propionyl groups could provide an adequate chemical compatibility with the castor oil and that the electrospun nanostructures could enable improved physical stability by creating a variety of morphologies allowing the tailoring of the rheological and tribological properties of the resulting greases. The experimental results show that the use of electrospun CAp nanostructures can indeed yield physically stable formulations, even when used at low concentrations (3 wt%). The resulting dispersions went through structural transitions due to changes in the thickener morphologies and/or concentration, as shown by oscillatory rheology, oil holding capacity, tackiness, and lubrication performance in metal–metal contact. We found that the formulations, containing smooth or porous CAp nanofibers, at 5 wt% as a thickener, possess suitable rheological and tribological properties with a performance comparable to that of traditional lithium lubricating greases.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"7 1","pages":"Pages 90-104"},"PeriodicalIF":9.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140273396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.nanoms.2024.01.005
Sen Chen , Feifan Liu , Taimei Cai , Rong Wang , Fangjian Ning , Hailong Peng
Acrylamide (AA) is a neurotoxin and carcinogen that formed during the thermal food processing. Conventional quantification techniques are difficult to realize on-site detection of AA. Herein, a flower-like bimetallic FeCu nanozyme (FeCuzyme) sensor and portable platform were developed for naked-eye and on-site detection of AA. The FeCuzyme was successfully prepared and exhibited flower-like structure with 3D catalytic centers. Fe/Cu atoms were considered as active center and ligand frameworks were used as cofactor, resulting in collaborative substrate-binding features and remarkably peroxidase-like activity. During the catalytic process, the 3,3′,5,5′-tetrame-thylbenzidine (TMB) oxidation can be quenched by glutathione (GSH), and then restored after thiolene Michael addition reaction between GSH and AA. Given the “on–off–on” effect for TMB oxidation and high POD-like activity, FeCuzyme sensor exhibited a wide linear relationship from 0.50 to 18.00 μM (R2 = 0.9987) and high sensitivity (LOD = 0.2360 μM) with high stability. The practical application of FeCuzyme sensor was successfully validated by HPLC method. Furthermore, a FeCuzyme portable platform was designed with smartphone/laptop, and which can be used for naked-eye and on-site quantitative determination of AA in real food samples. This research provides a way for rational design of a novel nanozyme-based sensing platform for AA detection.
{"title":"Dimensionality engineering of flower-like bimetallic nanozyme with high peroxidase-activity for naked-eye and on-site detection of acrylamide in thermally processed foods","authors":"Sen Chen , Feifan Liu , Taimei Cai , Rong Wang , Fangjian Ning , Hailong Peng","doi":"10.1016/j.nanoms.2024.01.005","DOIUrl":"10.1016/j.nanoms.2024.01.005","url":null,"abstract":"<div><div>Acrylamide (AA) is a neurotoxin and carcinogen that formed during the thermal food processing. Conventional quantification techniques are difficult to realize on-site detection of AA. Herein, a flower-like bimetallic FeCu nanozyme (FeCuzyme) sensor and portable platform were developed for naked-eye and on-site detection of AA. The FeCuzyme was successfully prepared and exhibited flower-like structure with 3D catalytic centers. Fe/Cu atoms were considered as active center and ligand frameworks were used as cofactor, resulting in collaborative substrate-binding features and remarkably peroxidase-like activity. During the catalytic process, the 3,3′,5,5′-tetrame-thylbenzidine (TMB) oxidation can be quenched by glutathione (GSH), and then restored after thiolene Michael addition reaction between GSH and AA. Given the “on–off–on” effect for TMB oxidation and high POD-like activity, FeCuzyme sensor exhibited a wide linear relationship from 0.50 to 18.00 μM (<em>R</em><sup>2</sup> = 0.9987) and high sensitivity (LOD = 0.2360 μM) with high stability. The practical application of FeCuzyme sensor was successfully validated by HPLC method. Furthermore, a FeCuzyme portable platform was designed with smartphone/laptop, and which can be used for naked-eye and on-site quantitative determination of AA in real food samples. This research provides a way for rational design of a novel nanozyme-based sensing platform for AA detection.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"7 1","pages":"Pages 123-133"},"PeriodicalIF":9.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140399906","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.nanoms.2024.02.005
Chenchen Li , Xian Chen , Tan Jin , Tianmin Wu , Jun Chen , Wei Zhuang
Incorporating low-dimensionalization technologies effectively tackle the challenge of inadequate long-term stability in hybrid halide perovskites, however their wide bandgap and strong quantum well confinement remain substantial obstacle for various optoelectronic applications. Addressing these issues without compromising long-term stability has emerged as a pivotal focus in materials science, in particular exploring the effects of the functional groups within spacer cations. Our simulations reveal that the robust π-π stacking interactions involving PEA+ and the strong hydrogen bonding interactions between PEA+ and MX64− contribute to narrowing the electronic bandgap in 2D monolayer PEA2MX4 (e. g. 2D monolayer PEA2SnI4: 1.34 eV) for reasonable visible-light absorption while simultaneously ensuring their favorable long-term stability. Moreover, the delocalized orbitals and relatively high dielectric constants in PEA+, attributed to the conjugated benzene ring, has been observed to weaken the potential barrier, exciton binding effect and quantum well confinement in 2D monolayer PEA2MX4, thus facilitating photogenerated electron-hole separations and out-of-plane carrier transport. The impact of spacer cations on the optoelectronic and transport properties of 2D monolayer perovskites highlights the critical role of meticulously chosen and well-designed spacer cations, especially functional groups, in shaping their photophysical properties and ensuring long-term stability even under extremely operating conditions.
采用低维化技术可以有效地解决混合卤化物包晶石长期稳定性不足的难题，但其宽带隙和强量子阱约束仍然是各种光电应用的巨大障碍。在不影响长期稳定性的前提下解决这些问题已成为材料科学领域的一个重要焦点，特别是探索间隔阳离子内官能团的影响。我们的模拟揭示了 PEA 强大的 π-π 堆叠相互作用以及 PEA 和 MX 之间强大的氢键相互作用有助于缩小二维单层 PEAMX 的电子带隙（例如二维单层 PEASnI：1.34 eV），从而实现合理的可见光吸收，同时确保其良好的长期稳定性。此外，由于共轭苯环的存在，PEA 中的分散轨道和相对较高的介电常数被观察到可以削弱二维单层 PEAMX 中的势垒、激子结合效应和量子阱约束，从而促进光生电子-空穴分离和平面外载流子传输。间隔阳离子对二维单层包晶的光电和传输特性的影响凸显了精心选择和设计的间隔阳离子（尤其是官能团）在塑造其光物理性质和确保其在极端工作条件下的长期稳定性方面的关键作用。
{"title":"Impact of functional groups in spacer cations on the properties of PEA-based 2D monolayer halide perovskites","authors":"Chenchen Li , Xian Chen , Tan Jin , Tianmin Wu , Jun Chen , Wei Zhuang","doi":"10.1016/j.nanoms.2024.02.005","DOIUrl":"10.1016/j.nanoms.2024.02.005","url":null,"abstract":"<div><div>Incorporating low-dimensionalization technologies effectively tackle the challenge of inadequate long-term stability in hybrid halide perovskites, however their wide bandgap and strong quantum well confinement remain substantial obstacle for various optoelectronic applications. Addressing these issues without compromising long-term stability has emerged as a pivotal focus in materials science, in particular exploring the effects of the functional groups within spacer cations. Our simulations reveal that the robust π-π stacking interactions involving PEA<sup>+</sup> and the strong hydrogen bonding interactions between PEA<sup>+</sup> and MX<sub>6</sub><sup>4−</sup> contribute to narrowing the electronic bandgap in 2D monolayer PEA<sub>2</sub>MX<sub>4</sub> (e. g. 2D monolayer PEA<sub>2</sub>SnI<sub>4</sub>: 1.34 eV) for reasonable visible-light absorption while simultaneously ensuring their favorable long-term stability. Moreover, the delocalized orbitals and relatively high dielectric constants in PEA<sup>+</sup>, attributed to the conjugated benzene ring, has been observed to weaken the potential barrier, exciton binding effect and quantum well confinement in 2D monolayer PEA<sub>2</sub>MX<sub>4</sub>, thus facilitating photogenerated electron-hole separations and out-of-plane carrier transport. The impact of spacer cations on the optoelectronic and transport properties of 2D monolayer perovskites highlights the critical role of meticulously chosen and well-designed spacer cations, especially functional groups, in shaping their photophysical properties and ensuring long-term stability even under extremely operating conditions.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"7 1","pages":"Pages 74-82"},"PeriodicalIF":9.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140154981","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.nanoms.2024.04.003
Xingwen Cheng , Jiangshan Luo , Federico Rosei
Lanthanide-sensitized upconverting nanoparticles (UCNPs) are widely studied because of their unusual optical characteristics, such as large antenna-generated anti-Stokes shifts, high photostability, and narrow emission bandwidths, which can be harnessed for a variety of applications including bioimaging, sensing, information security and high-level anticounterfeiting. The diverse requirements of these applications typically require precise control over upconversion luminescence (UCL). Recently, the concept of energy migration upconversion has emerged as an effective approach to modulate UCL for various lanthanide ions. Moreover, it provides valuable insights into the fundamental comprehension of energy transfer mechanisms on the nanoscale, thereby contributing to the design of efficient lanthanide-sensitized UCNPs and their practical applications. Here we present a comprehensive overview of the latest developments in energy migration upconversion in lanthanide-sensitized nanoparticles for photon upconversion tuning, encompassing design strategies, mechanistic investigations and applications. Additionally, some future prospects in the field of energy migration upconversion are also discussed.
{"title":"Photon upconversion tuning through energy migration in lanthanides sensitized nanoparticles","authors":"Xingwen Cheng , Jiangshan Luo , Federico Rosei","doi":"10.1016/j.nanoms.2024.04.003","DOIUrl":"10.1016/j.nanoms.2024.04.003","url":null,"abstract":"<div><div>Lanthanide-sensitized upconverting nanoparticles (UCNPs) are widely studied because of their unusual optical characteristics, such as large antenna-generated anti-Stokes shifts, high photostability, and narrow emission bandwidths, which can be harnessed for a variety of applications including bioimaging, sensing, information security and high-level anticounterfeiting. The diverse requirements of these applications typically require precise control over upconversion luminescence (UCL). Recently, the concept of energy migration upconversion has emerged as an effective approach to modulate UCL for various lanthanide ions. Moreover, it provides valuable insights into the fundamental comprehension of energy transfer mechanisms on the nanoscale, thereby contributing to the design of efficient lanthanide-sensitized UCNPs and their practical applications. Here we present a comprehensive overview of the latest developments in energy migration upconversion in lanthanide-sensitized nanoparticles for photon upconversion tuning, encompassing design strategies, mechanistic investigations and applications. Additionally, some future prospects in the field of energy migration upconversion are also discussed.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"7 1","pages":"Pages 134-144"},"PeriodicalIF":9.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141047028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2025-02-01DOI: 10.1016/j.nanoms.2024.02.001
Wenting Tao , Wenqin Shao , Meng Ma , Si Chen , Yanqin Shi , Huiwen He , Yulu Zhu , Xu Wang
The increasingly serious electromagnetic (EM) radiation and related pollution effects have gradually attracted people's attention in the information age. Hence, it's crucial to develop adaptive shielding materials with minimum EM waves (EMW) reflection. In this paper, Ag nanoparticles loaded mesoporous carbon hollow spheres (MCHS@Ag) were synthesized by chemical reduction method, and cellulose nanofibers (CNF)/MXene/MCHS@Ag homogeneous composites were prepared. The total EM interference shielding efficiency (SET) of CNF/MXene/MCHS@Ag composite film was 32.83 dB (at 12.4 GHz), and the absorption effectiveness (SEA) was improved to 26.6 dB, which was 63.1% and 195.5% higher than that of CNF/MXene/MCHS composite film. The low dielectric property of MCHS effectively optimized the impedance matching between the composites and air. The hollow porous structure prolonged the transmission path of EMW and increased the absorption loss of the composites. At the same time, Ag nanoparticles located the MCHS were helpful to construct the internal conductive path overcoming the damage of the conductive property caused by the low dielectric of MCHS. This research adopts a straightforward method to construct a lightweight, pliable, and mesoporous composites for EMI shielding, which serves a crucial role in the current era of severe EM pollution.
{"title":"Ag anchored mesoporous carbon hollow sphere in Cellulose nanofibers/MXene composite films for high-performance electromagnetic interference shielding","authors":"Wenting Tao , Wenqin Shao , Meng Ma , Si Chen , Yanqin Shi , Huiwen He , Yulu Zhu , Xu Wang","doi":"10.1016/j.nanoms.2024.02.001","DOIUrl":"10.1016/j.nanoms.2024.02.001","url":null,"abstract":"<div><div>The increasingly serious electromagnetic (EM) radiation and related pollution effects have gradually attracted people's attention in the information age. Hence, it's crucial to develop adaptive shielding materials with minimum EM waves (EMW) reflection. In this paper, Ag nanoparticles loaded mesoporous carbon hollow spheres (MCHS@Ag) were synthesized by chemical reduction method, and cellulose nanofibers (CNF)/MXene/MCHS@Ag homogeneous composites were prepared. The total EM interference shielding efficiency (SE<sub>T</sub>) of CNF/MXene/MCHS@Ag composite film was 32.83 dB (at 12.4 GHz), and the absorption effectiveness (SE<sub>A</sub>) was improved to 26.6 dB, which was 63.1% and 195.5% higher than that of CNF/MXene/MCHS composite film. The low dielectric property of MCHS effectively optimized the impedance matching between the composites and air. The hollow porous structure prolonged the transmission path of EMW and increased the absorption loss of the composites. At the same time, Ag nanoparticles located the MCHS were helpful to construct the internal conductive path overcoming the damage of the conductive property caused by the low dielectric of MCHS. This research adopts a straightforward method to construct a lightweight, pliable, and mesoporous composites for EMI shielding, which serves a crucial role in the current era of severe EM pollution.</div></div>","PeriodicalId":33573,"journal":{"name":"Nano Materials Science","volume":"7 1","pages":"Pages 65-73"},"PeriodicalIF":9.9,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140155314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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