LANGMUIR
·
2016
·
IF 3.993
Jing Shang,Kunlun Hong,Tao Wang,Dan Zhu,Jian Shen
Polyethylene oxide (PEO) has been widely used in biomedical fields. The antibiofouling property of the PEO-modified surface has been extensively investigated but is far from being fully understood. A series of PEOs with narrowly distributed molecular weight (Mw), synthesized with the technique of high vacuum anionic polymerization, have been successfully grafted onto the surface of silicon wafers. The power-law relationship between the thickness of the monolayer versus the Mw of the grafted PEO shows a scaling of 0.3, indicating compact condensing of the chains. The static contact angles show higher hydrophobicity for the layer of PEO with higher Mw, which can be attributed to the closely packed conformation of the chains with high density. The frequency shift of the contact resonance indicates that the Young’s modulus decreases and the loss factor increases with the increase in the Mw of PEO and the thickness of the PEO layers. Dielectric spectroscopy of bare or PEO-grafted wafers in the aqueous solutions reveals an interfacial polarization, which results from compositional and structural changes in the interface layer and depends on temperatures and salt concentrations. At a given grafting density, the PEO chains are swollen in pure water, demonstrating hydrophilic behavior, whereas they collapse in salt solutions, showing hydrophobic characteristics.
研究领域:
生物材料学
·
界面科学
·
高分子化学
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry B
·
2017
·Vol. 6
·期 1
·68-74
·
IF 4.543
Jingcai He,Junjian Chen,Guansong Hu,Lin Wang,Jian Zheng,Jiezhao Zhan,Yuchen Zhu,Chunting Zhong,Xuetao Shi,Sa Liu,Yingjun Wang,Li Ren
Infections associated with biomedical implants and devices pose a serious clinical challenge in hospitals worldwide. Antimicrobial peptides (AMPs) have become a great prospect to inhibit this type of infection due to their broad-spectrum antimicrobial activity and low cytotoxicity. However, it is still a challenge to apply AMPs on the biomaterial surface as the activity of AMPs is sensitive to salt or enzyme. In the present study, we prepared a spacer molecule, poly[2-(methacryloyloxy)ethyl]dimethyl-(3-sulfopropyl)ammonium hydroxide (polySBMA), on a model silicon surface via surface-initiated atom transfer radical polymerization (SI-ATRP). We then modified the antimicrobial peptide HHC36 (KRWWKWWRR) with L-propargylglycine (PraAMP) to improve its salt-tolerant activity and integrated PraAMP onto the spacer molecule using click chemistry. We employed X-ray photoelectron spectroscopy (XPS), contact angle goniometry, and atomic force microscopy (AFM) to confirm the success of the immobilization process. We also characterized the antimicrobial activity and stability of the surface with an antimicrobial assay. The results reveal that the modified surface exhibits good antimicrobial activity to inhibit 98.26% of E. coli, 83.72% of S. aureus, and 81.59% of P. aeruginosa. Furthermore, as compared to the control group without the polySBMA spacer, the modified surface improved its resistance to enzymolysis. An in vitro CCK-8 assay also illustrated that this surface showed negligible cytotoxicity to mouse bone mesenchymal stem cells.
研究领域:
生物材料学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Wei-qing An,Xiang-an Yue,Ji-rui Zou,Li-juan Zhang,Rong-jie Yan
In this study, we investigate the properties and behavior of interfacial water on solid silica surfaces and its implications for various applications. We utilize a combination of transmission electron microscopy (TEM), nuclear magnetic resonance, mass spectrometry, infrared, and Raman spectroscopy to explore the presence and characteristics of anomalous water on silica surfaces. Our findings reveal a stable, nanoscale layer of wall-bound water on the inner surface of silica tubes that persists under high vacuum and room temperature conditions. This layer is rich in hydrated hydrogen ions and exhibits a thickness that correlates with the density of hydroxyl groups in silica. Through additional experimentation, we demonstrate that reducing the density of silica hydroxyl groups causes the wall-bound water to return to a liquid state, highlighting the pivotal role of hydroxyl groups in the formation of this unique water layer. Our study offers valuable insights into the properties and behavior of interfacial water on solid surfaces and lays the foundation for potential applications in a wide range of fields, such as energy storage, drug delivery, environmental remediation, biological sample preparation, microfluidics, and nanofluidics. Future research will further explore the properties and behavior of interfacial water on different material surfaces and under various environmental conditions, laying the groundwork for technological innovation in related fields. By utilizing advanced approaches and fostering interdisciplinary collaboration, this research contributes significantly to our understanding of interfacial water and paves the way for the development of cutting-edge technologies that capitalize on its distinctive properties.
研究领域:
材料科学
·
表面化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2021
·
IF 4.759
Tao Bao,Sicen Wang,Nan Zhang,Juan Zhang
Inspired by the outstanding functions of 3-aminopropyltriethoxysilane (APTES), which can be used for functionalization of both covalent organic frameworks (COFs) and substrate surfaces, herein, a proof-of-concept demonstration was carried out by one-step synthesis and immobilization of COF-1 in capillary. COF-1 was grown on the inner wall of capillary using APTES, which played a triple role of catalyst, stabilizer, and connecting arm during the process. The immobilization of COF-1 on silicon surface was confirmed by scanning electron microscopy. Moreover, COF-1 modified capillary (COF-1@capillary) column exhibited excellent performance in the electrochromatographic separation of amino acids . High resolution and separation efficiency (225,378 plates/m for 4-methylbiphenyl) were successfully achieved. Separation of methylbenzene , styrene , ethylbenzene , chlorobenzene , 1,2-dichlorobenzene, 1,2,4-trichlorobenzene, 4-methylbiphenyl, naphthalene , and 4-vinylbipheny in the electro-driven mode confirmed the successful growth of COF-1 on the inner wall of capillary. The developed facile method for the immobilization of COF-1 may pave the way for further application prospects of boron-based COFs.
研究领域:
材料科学
·
分析化学
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产品关联
DOI
PubMed
高影响因子
Nanomanufacturing and Metrology
·
2018
·Vol. 1
·期 4
·225-235
·
IF 0
Geng Yanquan,Yan Yongda,Wang Jiqiang,Zhuang Yun
This study presents an atomic force microscope (AFM)-based scratching combined with reactive ion etching (RIE) method to fabricate nanopatterns on the silicon surface. All AFM-based scratching processes are performed on the polymethylmethacrylate (PMMA) film to create features in order to protect the AFM tip from wearing and enlarge its life time. Two types of resist films are selected for the RIE process. One is only PMMA thin-film resist, and the other one contains two-layer thin-film resist which are PMMA and aluminum thin films. The nanopatterns on the silicon after etching using RIE with these two types of resist film are compared. Results show that when using PMMA film, the width of the nanopattern on silicon is larger than on the PMMA film, and the material pile-ups formed during the scratching process cannot be considered as a resist. On the contrary, the aluminum thin films can improve the quality of the transfer. It indicates that the thin-film resist with bilayers can guarantee the transfer accuracy of the features, which can expand the application of the AFM tip-based scratching technique.
研究领域:
材料科学
·
纳米技术
✓ 已验证
DOI
Physica Status Solidi-Rapid Research Letters
·
2022
·Vol. 16
·期 6
·2100649
·
IF 3.277
Guoqiang Yu,Can Liu,Haiqi Gao,Tao Wang,Xiaoping Wu,Ping Lin,Lingbo Xu,Can Cui,Xuegong Yu,Peng Wang
Niobium oxide (Nb 2 O 5 ) films can provide excellent passivation for crystalline silicon (c-Si) surface after postdeposition annealing, however, its kinetic behavior and mechanism have not been explored. Herein, it is demonstrated that surface passivation by solution-processed Nb 2 O 5 films can be activated by low-temperature annealing (<200 °C) within several minutes, with the activation energy of 0.40 and 0.57 eV for hydrofluoric acid (HF) and RCA pretreated surfaces, respectively. Moreover, passivation is deactivated by higher-temperature annealing (>350 °C), with the deactivation energy of 0.86 and 1.06 eV for HF and RCA pretreated surfaces, respectively. The results combined with surface-sensitive X-Ray photoelectron spectroscopy (XPS) measurements indicate that the passivation kinetics of Nb 2 O 5 on the surface of c-Si are strongly related to the diffusion of hydrogen into and out of the Nb 2 O 5 /c-Si interface.
研究领域:
材料科学
·
半导体物理
✓ 已验证
产品关联
DOI
高影响因子
Energy Technology
·
2020
·Vol. 9
·期 1
·2000778
·
IF 3.404
Jiayuan Wang,Chao Gao,Xin Wang,Yangrunqian Wang,Zhendong Cheng,Hong Liu,Wenzhong Shen
Existing methods toward the preparation of perovskite deposited on textured silicon surfaces are technically complicated for perovskite/Si monolithic tandem solar cells (TSCs). Herein, a handy solvent engineering approach of introducing starch additive in MAPbI 3 -based one-step spin coating at room temperature is reported. The effect of different starch contents in perovskite precursor solution on morphological, structural, optical, and photovoltaic properties of the perovskite films is investigated. The starch enhances the solution viscosity and establishes hydrogen bonds with CH 3 NH 3 + , leading to the formation of almost same perovskite crystal structure films suitable for textured silicon surfaces. The perovskite film with a starch concentration of 5 wt% realizes full coverage on the textured silicon surface with an average thickness around 600 nm. Both the perovskite film and corresponding plane solar cell exhibit stable crystal structure and device performance due to the starch molecules located at the perovskite grain boundaries to lock the water molecules. The potential of pairing the yielded quasiconformal nanoscale coverage of perovskite layers with textured silicon surfaces is evaluated, and the uniform light absorption in perovskite layers and good match of the current density in perovskite/Si monolithic TSCs, with the best-calculated cell efficiency exceeding 29%, are demonstrated.
研究领域:
材料科学
·
光伏技术
·
能源工程
✓ 已验证
DOI
高影响因子
Environmental Science-Nano
·
2019
·Vol. 6
·期 9
·2712-2723
·
IF 7.704
Ruixing Huang,Chengxue Ma,Qiang He,Jun Ma,Zhengsong Wu,Xiaoliu Huangfu
Ion specific effects have been proved to be an important factor controlling the stability and dynamics of engineered colloidal systems; however, there has been limited research on the ion specific effects on the transport behaviors of engineered nanoparticles (ENPs). In the present study, the initial deposition kinetics of fullerene (C60) and ceria (CeO2) NPs in first-group monovalent cationic solutions (i.e., MNO3, M = Li+, Na+, K+ and Rb+) were quantitatively investigated, by employing a laboratory quartz crystal microbalance with the dissipation monitoring (QCM-D) technique. The influence of common model biomacromolecules, including a polysaccharide (alginate) and protein (bovine serum albumin (BSA)), was reported as well. The results demonstrated that the cations can decrease the deposition kinetics of different charged NPs with decreasing hydration degree of additive cations in the order Li+ > Na+ > K+ > Rb+. The variance in the deposition behaviors of NPs at fixed electrolyte concentration can be quantitatively explained by a modified DLVO theory that introduced hydration forces, which induced short range repulsion within the model that dominated the colloidal interactions of NPs with the surface and resulted in these specific effects. Moreover, the two biomacromolecules impacted the deposition of both NPs in an opposite manner: BSA could enhance the attachment of NPs on the silica surface, while alginate can decrease the deposition and enhance their mobility in aqueous solutions, dependent on the molecular complexity. These findings are helpful for understanding the deposition behavior of NPs under the effect of ionic specificity and giving quantitative evidence for the role of counterion hydration in the interactions between electrostatically charged ENPs and the environmental surface in aqueous media.
研究领域:
环境科学
·
胶体化学
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL POLLUTION
·
2014
·
IF 3.902
Hao Li,Bo Pan,Shaohua Liao,Di Zhang,Baoshan Xing
Iron is rich in soils, and is recently reported to form stable complexes with organic free radicals, generating environmentally persistent free radicals (EPFRs). The observation may challenge the common viewpoint that iron is an effective catalyst to facilitate the degradation of various organic chemicals. But no study was specifically designed to investigate the possible inhibited degradation of organic chemicals because of the formation of EPFRs in dry environment. We observed that catechol degradation under UV irradiation was decreased over 20% in silica particles coated with 1% hematite in comparison to uncoated silica particles. Stabilized semiquinone or quinine and phenol radicals were involved in HMT-silica system. EPFR formation was thus the reason for the reduced catechol degradation on HMT-silica surface under UV irradiation at ambient temperature. EPFRs should be incorporated in the studies of organic contaminants geochemical behavior, and will be a new input in their environmental fate modeling.
研究领域:
环境科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Yong Xiong,Zhen Li,Tiantian Cao,Shengming Xu,Shiling Yuan,Johan Sjöblom,Zhenghe Xu
Adsorption on silica surfaces of polyaromatic compounds, N-(1-hexylhepyl)-N′-(5-carboxylicpentyl)-perylene-3,4,9,10-tetracarboxylic bisimide (C5Pe) and N-(1-undecyldodecyl)-N′-(5-carboxylicpentyl)-perylene-3,4,9,10-tetracarboxylic bisimide (C5PeC11), individually and their binary mixture in heptol (mixture of heptane and toluene as oil) solutions were studied by molecular dynamics (MD) simulation, quartz crystal microbalance with dissipation (QCM-D), and atomic force microscopy (AFM). The MD simulation results showed that C5Pe molecules tend to aggregate and form a large cluster rapidly in the oil phase, reducing the energy of the system. In contrast, C5PeC11 molecules with higher solubility tend to disperse in the system. As a result, C5PeC11 molecules exhibited a stronger adsorption than C5Pe molecules on silica surfaces. In the binary mixture system, the overall solubility is only slightly lower than that in the C5PeC11 system due to the association of C5Pe with C5PeC11 molecules through π–π stacking and T-stacking interactions, leading to more polyaromatic compounds available for adsorption onto silica surfaces. The enhanced adsorption of both polyaromatic compounds on silica surfaces clearly illustrates the synergy of adsorption in the mixed systems of C5Pe and C5PeC11 as compared with the systems of their individual species. The adsorption characteristics revealed in MD simulations were confirmed by QCM-D measurement and AFM imaging. The observed synergy of adsorption provides insights into molecular assembly at silica–oil interfaces for the fabrication of devices or sheds lights on petroleum processing.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2016
·
IF 3.993
Jinjin Li,Chenhui Zhang,Peng Cheng,Xinchun Chen,Weiqi Wang,Jianbin Luo
By using atomic force microscopy (AFM), we showed that the liquid superlubricity with a superlow friction coefficient of 0.0007 can be achieved between two silica surfaces lubricated by hexadecyltrimethylammonium bromide (C16TAB) solution. There exists a critical load that the lubrication state translates from superlow friction to high friction reversibly. To analyze the superlow friction mechanism and the factors influencing the critical load, we used AFM to measure the structure of adsorbed C16TAB molecules and the normal force between two silica surfaces. Experimental results indicate that the C16TAB molecules are firmly adsorbed on the two silica surfaces by electrostatic interaction, forming cylinder-like micelles. Meanwhile, the positively charged headgroups exposed to solution produce the hydration and double layer repulsion to bear the applied load. By controlling the concentration of C16TAB solution, it is confirmed that the critical load of superlow friction is determined by the maximal normal force produced by the hydration layer. Finally, the superlow friction mechanism was proposed that the adsorbed micellar layer forms the hydration layer, making the two friction surfaces be in the repulsive region and meanwhile providing excellent fluidity without adhesion between micelles.
研究领域:
材料科学
·
纳米技术
·
表面化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FIRE TECHNOLOGY
·
2024
·
IF 2.3
Zhang Jiaqing,Shang Fengju,Liu Xin,Li Kaiyuan,Yang Yunpeng,Zou Yanyan
Nano SiO 2 particles (NPs) combined with organosilane surfactants present a promising avenue for the development of stable fluorine-free firefighting foams. In this study, hydrophilic nano SiO 2 particles, non-ionic organosilane surfactant (SiCare2238), and amphoteric hydrocarbon surfactant (LAMC) were prepared as a mixed dispersion to investigate the interactions between nano particles and surfactants, foaming ability, and foam stability of the mixed dispersion. Results indicated that the surface activity, electrical conductivity, and foaming ability of the mixed dispersion decreased with increasing NPs concentration. The impact of NPs on foam stability depended on the filling and blocking mechanisms within the platform boundary of the formed liquid film. At NPs concentrations below 1.5%, strong electrostatic interactions among surfactant molecules resulted in the adsorption of surfactant molecules on the nano particle surface, preventing the formation of a network structure at the platform boundary, thereby reducing foam stability. At NPs concentrations above 1.5%, a significant number of NPs formed a network structure, filling and blocking the platform boundary, leading to delayed foam drainage, coarsening, and enhanced foam stability. This study provides theoretical guidance for the application of nano particles in fluorine-free.
研究领域:
材料科学
·
化学工程
·
消防技术
✓ 已验证
DOI
高影响因子
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