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碳纳米管在APTES自组装膜表面沉积的研究 总被引：1，自引：0，他引：1
基于碳纳米管(CNTs)能沉积到3-氨丙基三乙氧基硅烷(APTES)自组装膜表面而定位,采用自组装方法,在硅基底上制备了具有氨基表面的APTES自组装膜。将APTES自组装膜浸入碳纳米管分散液(N,N-二甲基甲酰胺,DMF)中,实现了CNTs在APTES自组装膜上的沉积。实验发现,温度、时间以及CNTs在分散液中的浓度等因素对碳纳米管在APTES自组装膜上的沉积有很大影响。结果表明,延长沉积时间、提高沉积温度和CNTs在分散液中的浓度均能增强CNTs在自组装膜上的沉积,为进一步有效控制CNTs定位和构建基于CNTs结构的纳米电子器件提供了帮助。 相似文献
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3-氨丙基三乙氧基硅烷（APTES）是一种常用的表面修饰剂,通过化学键合的方式覆盖在硅结构表面形成APTES膜层,用以链接功能性生物分子。本文基于平面波导生物传感器器件的研究,通过对结构表面膜层的物理化学特性进行分析,对实验方案进行优化,降低表面微粗糙度,提升生物分子膜层的活性。文中在相同的实验环境下,将APTES分别溶于PBS、乙醇、甲苯溶液,进行APTES分子膜的生成,通过原子力扫描显微镜（AFM）、接触角测试仪、X-射线光谱仪（XPS）对不同样品表面微粗糙度（RMS）、接触角、成分等物理化学特性进行分析,确定应用于光学生物传感器器件APTES表面修饰的最佳配剂,为提高平面波导生物传感器的灵敏度提供了理论支持。 相似文献
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以十六烷基三甲基溴化铵为模板剂,正硅酸乙酯为硅源,室温下制备了六方有序介孔材料MCM-41,用1,3,5-三甲苯(TMB)、-氨丙基三乙氧基硅烷(APTES)对其进行化学修饰,得到改性MCM-41。采用XRD、红外光谱、氮气吸附-脱附等方法对样品进行了结构表征,结果表明,改性MCM-41保留了MCM-41的六方有序结构,扩孔后得到较大孔径的介孔MCM-41,经硅烷化修饰后减少了表面硅羟基,增大了MCM-41的表面极性,有利于介孔材料MCM-41的组装。 相似文献
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《Ceramics International》2017,43(15):11838-11847
We investigated the surface modification of zinc oxide nanoparticles (ZnO-NPs) with 3-aminopropyltriethoxysilane (APTES). The ZnO-NPs were synthesized by the physical method of continuous arc discharge in controlled atmosphere (DARC-AC). The surface modification was performed using a chemical method with constant stirring and reflux for 24 h at room temperature. This surface functionalization of the ZnO nanoparticles (funct-ZnO-NPs) was experimentally confirmed by infrared spectroscopy (FT-IR), Raman spectroscopy, TGA, UV–Visible and XRD, while its morphological characterization was performed by HRTEM. Using Raman spectroscopy, it was possible to study the functionalization process after the change, as well as the appearance of new bands of the molecular vibrations produced by the chemical interaction of the surface of the nanoparticles with the silane coupling agent. Comparing the Raman spectra of the ZnO-NPs, APTES and funct-ZnO-NPs, it was observed that the area between 2700 and 3200 cm−1 related to the vibrations of the CH2 and CH3 bonds of the APTES molecule. The funct-ZnO-NPs showed a decrease in the peak intensity, which indicates a deactivation of the degrees of freedom of the APTES at the time of the surface functionalization with the ZnO-NPs, suggesting a redistribution of the APTES CH2 groups, as they interact with the surface of the ZnO-NPs. The APTES molecule is anchored to the surface of the ZnO-NPs via one or two Si-O-Zn bonds and not by three, as is commonly reported. The above finding is attributable to steric impediment of the side groups of the APTES and the strain of the Si-O-Zn bonds that hinders the trivalent interaction with the surface of the nanostructured ZnO. Similarly, the results obtained by Raman were verified and complemented by means of FT-IR due to the presence of bands at specific wavelengths. 相似文献
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A. P. Taylor R. I. Webb J. C. Barry H. Hosmer R. J. Gould B. J. Wood 《Journal of microscopy》2000,199(1):56-67
A variety of adhesive support-films were tested for their ability to adhere various biological specimens for transmission electron microscopy. Support films primed with 3-amino-propyl triethoxy silane (APTES), poly- l -lysine, carbon and ultraviolet-B (UV-B)-irradiated carbon were tested for their ability to adhere a variety of biological specimens including axenic cultures of Bacillus subtilis and Escherichia coli and wild-type magnetotactic bacteria. The effects of UV-B irradiation on the support film in the presence of air and electrostatic charge on primer deposition were tested and the stability of adhered specimens on various surfaces was also compared. APTES-primed UV-B-irradiated PioloformTM was consistently the best adhesive, especially for large cells, and when adhered specimens were UV-B irradiated they became remarkably stable under an electron beam. This assisted the acquisition of in situ phase-contrast lattice images from a variety of biominerals in magnetotactic bacteria, in particular metastable greigite magnetosomes. Washing tests indicated that specimens adhering to APTES-primed UV-B-irradiated PioloformTM were covalently coupled. The electron beam stability was hypothesised to be the result of mechanical strengthening of the specimen and support film and the reduced electrical resistance in the specimen and support film due to their polymerization and covalent coupling. 相似文献
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目的 通过对铜箔进行硅烷化处理,增强铜箔的耐腐蚀性能.方法 采用化学浸泡法在9 µm电解铜箔表面制备 γ-氨丙基三乙氧基硅烷偶联剂(APTES)硅烷膜层、Ce3+/APTES 膜层、CeO2/APTES 膜层和Ce3+/CeO2/APTES膜层,对改性硅烷膜试样与空白试样进行接触角对照实验,对硅烷表面润湿性进行表征.在 3.5%(质量分数)NaCl 溶液中,对空白样、单一硅烷膜层、Ce3+/APTES 硅烷膜层和 Ce3+/CeO2/APTES硅烷膜层进行浸泡实验和电化学实验,研究改性膜层前后的耐腐蚀性能.通过扫描电子显微镜(SEM)观察膜层表面形貌,并利用傅里叶变换红外光谱(FTIR)和 X 射线光电子能谱(XPS)对纳米粒子结构进行分析,探讨改性膜层的钝化机理.结果 Ce(NO3)3/CeO2/APTES复合膜层的接触角最大,接触角为 106.6°,表现出最佳的疏水性.同时,其表面的腐蚀坑数量和面积最小.在盐水浸泡和电化学实验中,各试样的腐蚀电流密度随着浸泡时间的延长而上升,Ce3+/CeO2/APTES试样的腐蚀电位发生正移,具有较低的腐蚀电流密度,并且该试样具有最高的相角和最高的阻抗值,远高于 Ce3+/APTES 试样.结论 与单一硅烷膜层和仅分别添加Ce(NO3)3、CeO2 2 种缓蚀剂的膜层相比,Ce(NO3)3/CeO2/APTES复合膜层的防护效果有明显提升,且Ce3+与CeO2之间的协同作用大大提高了硅烷膜层的耐腐蚀性能. 相似文献
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Kishore K Jena Sambita Sahoo Ramanuj Narayan Tejraj M Aminabhavi KVSN Raju 《Polymer International》2011,60(10):1504-1513
Thermally resistant and mechanically stable novel hyperbranched waterborne polyurethane‐urea/silica hybrid coatings were prepared by using 3‐aminopropyltriethoxysilane as a coupling agent with SiO2 as a crosslinker. The extent of hydrogen bonding was investigated to show a dependence on SiO2 concentration, which increased the glass transition temperature of the polymers with increasing SiO2 concentration. Thermal decomposition profiles and the corresponding stability data suggest two‐step decomposition for the hybrids; further, their stability increased with increasing concentration of SiO2.Copyright © 2011 Society of Chemical Industry 相似文献
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Rapid assembly of carbon nanotube-based magnetic composites 总被引：1，自引：0，他引：1
Alina V. Korobeinyk Raymond L.D. Whitby Jun Jie Niu Yury Gogotsi Sergey V. Mikhalovsky 《Materials Chemistry and Physics》2011
The rapid assembly of magnetic carbon nanotubes is mediated through the electrostatic attraction of α-haematite nanoparticles to carboxylic groups decorating their outer surface. The system is then stabilised through covalently bonding a silica coat using a 3-aminopropyltriethoxysilane precursor, which creates a thin barrier protecting the α-haematite particles from aggressive pH solutions. The nanocomposites can be effectively dispersed in aqueous solution and can be attracted to an external magnetic field. The proposed method can be used for synthesis of magnetic CNTs suitable for assembling densely packed magnetic arrays, remotely guided drug delivery and organic chemical wastewater remediation with the added benefit of nanomaterial recovery. Therein, p-nitroaniline was demonstrated to still adsorb to uncoated areas of the silica-sheathed magnetic MWCNT composite. 相似文献
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