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自组装单层或单分子膜(Self-assembled monolayers)的研究十分活跃,尤其是硫-金体系的单层研究更是得到科学家们的青睐。3-巯基丙酸由于可以在金基底形成稳定有序的二维自组装单分子膜,从而显示出独特的结构和表面性质。该文着重从膜的制备、膜内分子的结构、单层膜的性质以及应用等方面综述金基底上3-巯基丙酸自组装单分子膜的研究进展,并对其前景进行了展望。 相似文献
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立足于分子自组装单层膜的制备及结构, 讨论了分子自组装单层膜的头基基团与基底的作用机理、 主链与环境的温度依赖关系, 特别是其端基基团的化学性质及构象对表面浸润行为的影响. 重点讨论了分子自组装单层膜的端甲基基团对表面能的贡献、 极性端基基团与水分子之间的相互作用以及自组装单层膜表面的分子尺寸粗糙度对表面浸润的影响. 最后, 基于理论和实验基础对以上问题提出新的认知与看法, 并对未来该领域发展的机遇与挑战进行了展望. 相似文献
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本文使用Triton X-100作为模板剂制备半导体硫化银纳米颗粒,并研究了其吸收光谱的兰移特性。在金属铝或金基底上自组装有机双功能分子单层膜后,将其浸入所制备的纳米硫化银颗粒的微乳液中,自组装得到硫化银纳米颗粒单层膜并研究了其表面形貌特征。 相似文献
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银电极上植酸钠/2-氨基-5-巯基-1,3,4-噻二唑混合自组装层的表面增强拉曼光谱和电化学研究 总被引:2,自引:0,他引:2
应用表面增强拉曼散射光谱(SERS)和电化学方法, 对银电极上2-氨基-5-巯基-1,3,4-噻二唑(AMT)和植酸钠混合自组装单层结构和缓蚀性能关系进行了研究. SERS光谱表明, 银电极表面形成AMT膜后, 再组装植酸钠分子能够弥合AMT膜的缺陷. 交流阻抗和极化曲线实验表明, 形成的混合自组装层比单一AMT自组装层表现出更好的缓蚀性能. AMT膜层的等效电路为R(Q(R(Q(RW)))); 混合膜层电路图为LR(Q(R(Q(R)))). 相似文献
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采用静电吸附层-层自组装方法制备了层状二氧化锰/2,2'-联吡啶铁自组装膜材料,借助扫描电镜(SEM),紫外可见光谱(UV-Vis)和电化学工作站等测试手段对自组装膜的结构与性能进行了表征.结果表明,该自组装膜具有均匀的表面和紧密的层状结构,在可见光照射条件下该自组装膜电极的氧化还原电流明显增加了.层状二氧化锰/2,2'-联吡啶铁自组装膜电极,在可见光照射条件下光电降解有机染料罗丹明B(1×10-5mol/L)反应80min降解率达到了57%. 相似文献
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通过控制固/液界面电极电位的方式, 控制表面活性剂和金属离子在电极表面的自组装, 制备出了高度取向的ZnO/表面活性剂复合多层膜. 对无机层形态和结构进行了分析, 并采用X射线反射率和X射线漫散射研究了电极电位控制下ZnO/表面活性剂复合多层膜在固/液界面的自组装生长. 结果表明, 在一定电位下, 只有当表面活性剂浓度低于其饱和吸附浓度时, 采用阶跃电位沉积方式才能明显改变复合薄膜的周期厚度; 恒电位沉积方式控制电极电位时, 随着沉积电位的提高, 多层膜层状结构由一组层状相变为多组层状相, 同时层状结构的取向变差. 实验研究结果验证了电化学自组装过程是由金属离子的还原速度和表面活性剂的吸附速度二者共同控制完成的. 相似文献
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Na2Ti3O7, with layered structure, was prepared from a 1:3 molar mixture of powdered Na2CO3 and TiO2 by heating at 800 °C for 2 h. The Na+ ions were exchanged for H+ ions by hydrochloric acid treatment; next, n-butylamine, n-octylamine, n-decylamine or n-dodecylamine were incorporated at pH=3.6–3.8. It was proven by XRD measurements that, as the length of the alkyl chain of the amines was increased, smaller amounts of amines were intercalated under identical conditions. H2Ti3O7 samples dispersed in liquids of various compositions and polarities were used for the preparation of self-assembled titanate/polymer films for further sensor applications. Titanates, their composites with alkyl amines and the self-assembled hybrid structures were characterized by X-ray diffraction, thermoanalytical, optical, electron and atomic force microscopic measurements. 相似文献
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《Analytical letters》2012,45(11):2129-2151
ABSTRACT A Mini Review on recent immobilisation techniques for the realisation of piezoelectric biosensors is presented. The reactions considered are affinity reactions such as DNA hybridisation and antigen/antibody systems. The immobilisation procedures considered are based on avidin-biotin interaction, adsorption and self-assembled monolayers. 相似文献
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The modification of a surface at the molecular level with precise control of the building blocks generates an integrated molecular system. This field has progressed rapidly in recent years through the use of self-assembled monolayer (SAM) interfaces. Recent developments on surface-initiated chemical reactions, functionalization, and graft polymerization on SAM interfaces are emphasized in the present review. A number of surface modifications by grafting are reviewed. The grafting of polyaniline on a glass surface, previously modified with a silane self-assembled monolayer (SAM), is examined in detail for both planar and 3-D systems, such as fibers, nanoparticles, and even polymer patterned surfaces. We also discuss the graft polymerization of water-soluble polymers on the surface of silicon nanoparticles, which generate stable aqueous colloidal solutions and have numerous applications. Finally, we compare and review some surface-modification techniques on the surfaces of polymers, such as two-solvent entrapment, polymer blending, and chemical grafting, which improve their biocompatibility. 相似文献
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0 Introduction The strategy for fabrication of functionalized self- assembled films has been developing rapidly in recent years. Fujihara and his coworkers[1,2] first reported the dehydrative coupling of a carboxyl group of rhodamine B with a surface hydroxyl group to form a presumed ester linkage. Sustained photocurrents from ester- linked tin oxide electrodes were 2 orders of magnitude higher than those obtained from amide-linked silane- pretreated tin oxide surfaces. Soon after, Goodenough… 相似文献
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研究了正、叔十二烷基硫醇在铜表面上的自组装及混合自组装成膜情况,并利用交流阻抗和极化曲线电化学方法测试了正、叔十二烷基硫醇在铜表面上自组装膜及混合自组装膜对铜的耐腐蚀性,考察了正十二烷基硫醇自组装膜质量与正十二烷基硫醇溶液的浓度及组装时间的关系。研究结果显示,混合自组装膜的质量及其对铜的耐腐蚀性比仅组装正或叔十二烷基硫醇均有很大的提高。 相似文献
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Mendes PM 《Chemical Society reviews》2008,37(11):2512-2529
The development of surfaces that have switchable properties, also known as smart surfaces, have been actively pursued in the past few years. The recent surge of interest in these switchable systems stems from the widespread number of applications to many areas in science and technology ranging from environmental cleanup to data storage, micro- and nanofluidic devices. Moreover, the ability to modulate biomolecule activity, protein immobilisation, and cell adhesion at the liquid-solid interface is important in a variety of biological and medical applications, including biofouling, chromatography, cell culture, regenerative medicine and tissue engineering. Different materials have been exploited to induce such changes in surface biological properties that are mostly based on self-assembled monolayers or polymer films. This critical review focuses on the recent progress in the preparation of these switchable surfaces, and highlights their applications in biological environments. The review is organized according to the external stimuli used to manipulate the properties of the substrate-chemical/biochemical, thermal, electric and optical stimuli. Current and future challenges in the field of smart biological surfaces are addressed (189 references). 相似文献
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Miniaturized sample preparation and separation methods for environmental and drug analyses. 总被引:3,自引:0,他引:3
Yoshihiro Saito Maki Kawazoe Motohiro Imaizumi Yoriko Morishima Yuji Nakao Kayo Hatano Makiko Hayashida Kiyokatsu Jinno 《Analytical sciences》2002,18(1):7-17
Miniaturized extraction and separation media have been successfully developed from precisely controlled technologies. In this article, recent developments in these high performance analytical methods, such as miniaturized sample preparation methods and the coupling of these techniques with microscale separation systems, have been reviewed, along with some applications to environmental and biological analysis. The advantage of the miniaturization is not only for the environmental compatibility but also for the developments of the high performance analytical systems. Down-sizing also makes it possible to investigate and introduce various compounds and materials as novel media (such as tailor-made materials and devices) in separation science. As a typical example of the novel miniaturized sample preparation system, the applications of fibrous materials for microcolumn liquid-phase separation methods are described. 相似文献
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Takashi Nakanishi Masanobu Naito Yukikazu Takeoka Kazunori Matsuura 《Current Opinion in Colloid & Interface Science》2011,16(6):482-490
In this review article, we describe recent progress about exotic self-assembled systems with various dimensions including biomolecules, supramolecules, unique hydrophobic amphiphiles, polymers, nano-clusters, and colloidal particles. Construction of robust biomolecular assemblies with exotic structures, such as ring and hollow capsule, is achieved by rational designs of symmetric biomolecular conjugates. In addition, we comprehensively summarized leading-edge topics on optical/topological properties of self-assembled hybrid systems, such as circularly polarized luminescence or structural color. The preparation of colloidal amorphous array with photonic band gap-induced angle-independent structural color is also achieved in consideration of the following situations: i) two-body sphere–sphere potential, ii) disorder packing using different sizes of colloidal particles, and iii) softness of colloidal particles. Lastly, we demonstrated useful utilizations of exotic self-assembled objects. Flakelike microparticles were transcribed into various nano-flake metals and applied as temperature indicator for the local heating of an addictive. All findings described here show meaningful hybrid strategies in self-assembly techniques and their functionalization as well as materialization. 相似文献