共查询到20条相似文献,搜索用时 171 毫秒
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铂纳米颗粒自组装膜的微图像化 总被引:1,自引:0,他引:1
从硝基重氮树脂(NDR)与包裹巯基乙酸的铂纳米颗粒(MA-PtNP)的静电自组装,制备了感光性的自组装多层超薄膜,经选择性紫外曝光和十二烷基硫酸钠(SDS)水溶液显影,光照部分的膜,因层与层之间的离子键转变为共价键,不再被SDS水溶液洗脱而留下来;未光照部分的膜,层与层之间仍是离子键,在显影时被除去,从而形成图像、用AFM和SEM对形成的图像进行了表征. 相似文献
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用自组装法将纳米金粒子组装到化学修饰过的ITO玻璃片上,制备了一种新型的多层纳米金修饰电极。用紫外可见光谱、循环伏安等方法对其进行了研究。结果表明:电极对抗坏血酸具有良好的电催化氧化作用,峰电流与浓度在1.0×10^-5~1.4×10^-2mol/L范围内线性关系良好,检出限4.0×10^-6mol/L。 相似文献
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光致变色的PWl2/1,10-DAD自组装超晶格多层膜 总被引:1,自引:0,他引:1
本文报道了在固体基底表面上用PE方法连续自组装沉积PWl2和1,10-DAD分子,构建了PWl2/1,10-DAD自组装多层膜.紫外一可见吸收、X射线衍射等分析结果表明此多层膜有好的超晶格结构,层间距为3.19nm.与真空蒸镀WO3薄膜相比,PWl2/1,10-DAD自组装多层膜表现出更好的光致变色特性. 相似文献
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导电纳米颗粒对Sb:SnO2薄膜性能影响研究 总被引:1,自引:1,他引:0
采用水热晶化法,通过控制水热反应条件、溶液的浓度以及矿化剂的种类等因素,制备出分散性及导电性良好的SnO2纳米颗粒.采用溶胶-凝胶浸渍镀膜的方法制备Sb掺杂SnO2薄膜,在镀膜溶液的配制过程中引入SnO2纳米颗粒悬浮液,经陈化后最终得到镀膜溶液.采用van der Pauw法、UV/VIS分光光度计以及Fourier变换红外光谱仪研究和分析了添加纳米颗粒对膜层导电性能、光学性能以及膜层结构的影响;采用场发射扫描电镜研究了膜层的表面形貌.结果表明导电纳米颗粒的加入可有效提高膜层的导电性能,当SnO2纳米颗粒添加质量分数为10%时,膜层的电阻率为6.5×10…3Ω·cm;添加和未添加纳米颗粒的膜层的可见光透过率均为85%.纳米颗粒参与了溶胶-凝胶制备薄膜网络的形成,提高了膜层结构的连续性,从而使膜层具有较好的导电性能和光学性能. 相似文献
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利用自组装方法,将双巯基化合物通过形成金硫键修饰至金电极表面,再利用双巯基化合物的另一个一SH基,吸附纳米金颗粒形成纳米金的膜。运用循环伏安法对此修饰电极进行研究。发现双巯基化合物的最佳修饰时间为2小时;纳米金的最佳修饰速度为6小时:当扫描速度为100mv/s时固定抗体抗原的效果最好;而抗体抗原浓度为1:4时固定效果最佳; 相似文献
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Morphology control of ordered mesoporous carbon was performed using an organic-organic interaction approach. Mesoporous carbons were synthesized from a resorcinol-phloroglucinol/formaldehyde polymer and triblock copolymer Pluronic F127 in ethanol-water solutions of different molar ratios. A face-centered orthorhombic Fmmm structure was formed in the film prepared by dip-coating method. A three-dimensional wormhole-like mesostructure was formed during powder preparation at EtOH/water molar ratios ranging from 0.5 to 1.25. When the molar ratio was further increased to 2.5, a hexagonal p6mm structure was obtained. The pore size of the mesoporous carbon powders increases with increasing EtOH/water molar ratio. A dual-templating approach was demonstrated to prepare mesoporous carbon nanofibers. Anodic aluminum oxide membranes were used as a hard template. A mesostructure with a short-range order was formed and oriented along the surface in different directions. The structural order became distorted in the interior region. 相似文献
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Jian-Hong Lee Shu-Yi Tsai Chia-Hung Kuo Min-Hsiung Hon Ing-Chi Leu 《Ceramics International》2013,39(4):4069-4074
This paper describes a transfer printing technique for directly patterning ordered TiO2 thin films onto Si substrates. Two- or three-dimensional TiO2 structures can be fabricated onto an Si substrate depending on the coating film thickness, which is controlled via the liquid phase deposition process parameters and attractive interaction forces between a poly(dimethylsiloxane) stamp and a polyelectrolyte layer during the transfer printing process. This additive transfer process is mediated by the presence of a thiol (SH)-terminated 3-mercaptopropyltrimethoxysilane self-assembled monolayer on the wafer surface. The transferred patterns are chemically bonded to the wafer surface, exhibiting strong adhesion. The attractive interaction forces between the stamp and the polyelectrolyte layer was weak enough to allow ready detachment of the patterns from the stamp during printing. Even the parts of a continuous TiO2 film that are not in contact with the substrate effectively transfer to form a free-standing structure. With long and short deposition times, three-dimensional structures and ordered two-dimensional round-hole grid structures, respectively, are obtained after the removal of the stamps. 相似文献
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《Carbon》2013
We report a new chemical vapor synthesis method that exploits random fluctuations in the viscous boundary layer between a laminar vapor flow and a surface to yield a not previously observed product: radial ferromagnetically filled-carbon-nanotube structures departing from a central particle. The filling of the nanotube capillary is continuous over a scale much greater than that which can be achieved by conventional CVD. This is a simple method which does not require ultra-fine control of process parameters or highly-engineered reactor components in which a single, self-organized, ordered product is formed in randomly fluctuating vapor in the boundary layer by vapor-, liquid-, solid-phase self-organization. These fluctuations create the thermodynamic conditions for formation of the central particle in the vapor which in turn defines the spherically symmetric diffusion gradient that initiates the radial growth. The subsequent radial growth is driven by the supply of vapor feedstock by local diffusion gradients created by endothermic graphitic carbon formation at the vapor-facing tips of the individual nanotubes and is halted by contact with the surface. The radial structures are the dominant product and the reaction conditions are self-sustaining. We argue that the method has potential for scalable production of metal-carbon nanostructures with other unusual morphologies. 相似文献
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应用空区探测系统(Cavity Monitoring System,简称CMS),精确地获取地下矿山采空区的三维形态和准确的空间位置,并借助大型三维矿床软件SURPAC建立起了空区的三维形态模型,在此基础上,研究提出了空区稳定性数值模拟建模的SURPAC和FLAC3D耦合方式,形成了基于实测的采空区稳定性数值模拟分析的新方法,有效地提高了采空区稳定性数值模拟结果的准确性和可靠性.该方法已在铜坑矿采空区群稳定性数值模拟研究中成功应用,验证了该技术的有效性和可靠性. 相似文献
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A new approach is presented to fabricate open-cellular carbon materials with an ordered, lattice-type micro-scale architecture. The carbon micro-lattice materials were fabricated by pyrolyzing a polymer precursor template formed from an interconnected three-dimensional array of self-propagating photopolymer waveguides. Impregnating the polymer precursor template with acrylonitrile increased the carbon yield of the material from 19% to 46%. Structural analysis and density measurements of the solid carbon phase are consistent with vitreous carbon. Compression experiments yielded a compressive modulus (E) of 1.1 GPa and a failure strength (σf) of 10.2 MPa for a structure with relative density of 12.8%. 相似文献
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The EO20PO70EO20 (molecular weight 5800) amphiphile as a template is to form dispersed micelle structures. Silver nanoparticles, as inorganic
precursors synthesized by a laser ablation method in pure water, are able to produce the highly ordered vesicles detected
by TEM micrography. The thickness of the outer layer of a micelle, formed by the silver nanoparticles interacting preferentially
with the more hydrophilic EO20 block, was around 3.5 nm. The vesicular structure ensembled from micelles is due to proceeding to the mixture of cubic and
hexagonal phases. 相似文献
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基于电阻抗成像(electrical impedance tomography,EIT)的原位可视化特征,以酵母与高岭土为模型污染物,在不同错流速度下对超滤(UF)膜不同的污染过滤特性进行了研究,得到通量变化、平均电压变化、EIT图像,进行了三维图像重建,并建立了膜通量与平均电压间的相关性模型。结果表明:EIT图可直观显示膜污染界面的变化情况,酵母溶液形成的膜污染呈现空间上的不均匀分布,而高岭土溶液形成的膜污染较为均匀,混合溶液形成的污染分布居于两者之间。通过EIT信号的重建图像得到了有关污染层厚度方面的信息,结果表明,酵母形成的污染层最厚,其次为酵母及高岭土混合溶液,污染层最薄的为高岭土溶液。 相似文献