共查询到19条相似文献,搜索用时 78 毫秒
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微囊是一类重要的功能性材料,在生物医药研究领域有重要用途。微囊的囊壁构建材料一般为脂质体和聚合物。以纳米粒子作为囊壁可将纳米粒子独特的物理化学性质整合到微囊中,使微囊具有机械强度高、渗透性可控、表面易于修饰和容易实现负载物的可控释放等特点,这种新型微囊在生物转运研究领域有潜在的应用前景。本文综述了以纳米粒子作为囊壁的微囊自组装研究进展,介绍了微囊自组装基本理论、囊壁的构建方法、微囊多分散性的改善方法,最后对纳米级微囊的自组装所面临的技术难点进行了讨论,并对纳米级微囊自组装的发展方向进行了展望。 相似文献
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聚合物-纳米金复合物既具有金纳米粒子的光、电及催化性能,又具有聚合物的可加工性及对外界的刺激响应性,因此已成为高分子科学及材料科学研究的热点。本文主要介绍了我们实验室在聚合物-纳米金在油水界面的自组装及有序结构的构筑研究方面的相关工作:(1)利用界面聚合的方法制备侧链接枝亲水性金纳米粒子的聚苯乙烯及杂化聚合物在水溶液中的自组装;(2)亲水性金纳米粒子及疏水性聚合物(或疏水性磁性纳米粒子)在油水界面的自组装研究;(3)利用金纳米粒子为交联点制备具有温度响应性聚合物微凝胶的研究。 相似文献
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纳米粒子的自组装作为自下而上构筑纳米组装结构的简便且高效的策略而受到广泛关注,但在组装结构的精准性、多样性以及可操控性等方面仍面临较大的挑战.纳米粒子的程序化自组装是指特定的纳米粒子基元按照预先编好的程序自发排列成位置和取向等空间排列方式受到精准调控的组装结构,其更强调任意构筑一系列符合预先设定结构的多种形式纳米粒子组装体.本文总结了应用于纳米粒子程序化自组装的四类常用策略,即类原子成键、区域选择性修饰、模板引导和物理场调控,着重评述了近年来该领域的一些重要进展,并对纳米粒子程序化自组装的未来发展做了展望. 相似文献
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嵌段共聚物和纳米粒子复合纳米材料具有优异的性能,在生物医药、光电材料、催化材料等领域具有很大的应用价值,已成为备受关注的研究热点.利用嵌段共聚物自组装能够形成特定形态的纳米结构聚集体,将纳米粒子选择性的分布和定位于嵌段共聚物聚集体中,可以改善纳米粒子的性能及其应用.本文综述了近年来实验上利用自组装制备嵌段共聚物-纳米粒子复合纳米材料的方法,并总结分析了影响纳米粒子在嵌段共聚物聚集体中的分布和定位的各种因素,包括纳米粒子的大小、形状及其表面化学.最后总结了嵌段共聚物-纳米粒子的自组装在理论模拟方面的研究. 相似文献
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原位自组装形成二氧化硅/十六烷基三甲基溴化铵纳米网络粒子 总被引:3,自引:0,他引:3
提出了以具有纳米尺寸孔径及孔壁厚度的MCM 48作为无机基体、以无机 有机原位自组装的方法形成纳米网络粒子 .研究结果表明 ,在一定实验条件下 ,有机相可进入无机相的三维孔道自组装形成立方有序结构的纳米网络复合粒子 .通过研究纳米网络粒子在极性介质和非极性介质中的分散发现 ,有机相的存在有利于纳米网络粒子的分散 相似文献
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用L-苯丙氨酸乙酯(L-Phe)改性透明质酸(HA)双亲性生物大分子(HA-Phe)负载生物活性分子木瓜蛋白酶(papain),HA-Phe和Papain通过静电、氢键和疏水相互作用自组装形成生物基Papain/HA-Phe复合纳米粒子.用动态光散射(DLS)和透射电镜(TEM)对复合纳米粒子的尺寸和形貌进行表征.结果显示,形成的复合纳米粒子为球形结构,粒径约308 nm.以此复合纳米粒子为颗粒乳化剂稳定白油,形成水包油型Pickering乳液.乳液的扫描电镜(SEM)显示,复合纳米粒子吸附在油水界面,形成复合纳米粒子的吸附层以稳定乳液.详细研究了pH和盐浓度对复合纳米粒子性质和复合纳米粒子乳化性能的影响.结果表明,随着pH增加,复合纳米粒子在油滴表面的吸附数目减少,乳化性能降低;随着盐浓度增加,复合纳米粒子的形变能力增强,乳化性能提高.进一步研究了乳液中木瓜蛋白酶的活性及美白效果.研究表明,制备的乳液保留了一定的活性,且具有一定的美白效果. 相似文献
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Electrostatic‐Driven Dynamic Jamming of 2D Nanoparticles at Interfaces for Controlled Molecular Diffusion 下载免费PDF全文
Prof. Jianhui Luo Minxiang Zeng Baoliang Peng Yijie Tang Lecheng Zhang Pingmei Wang Lipeng He Dali Huang Ling Wang Xuezhen Wang Mingfeng Chen Shijun Lei Pengcheng Lin Ying Chen Prof. Zhengdong Cheng 《Angewandte Chemie (International ed. in English)》2018,57(36):11752-11757
Dynamically engineering the interfacial interaction of nanoparticles has emerged as a new approach for bottom‐up fabrication of smart systems to tailor molecular diffusion and controlled release. Janus zwitterionic nanoplates are reported that can be switched between a locked and unlocked state at interfaces upon changing surface charge, allowing manipulation of interfacial properties in a fast, flexible, and switchable manner. Combining experimental and modeling studies, an unambiguous correlation is established among the electrostatic energy, the interface geometry, and the interfacial jamming states. As a proof‐of‐concept, the well‐controlled interfacial jamming of nanoplates enabled the switchable molecular diffusion through liquid–liquid interfaces, confirming the feasibility of using nanoparticle‐based surfactants for advanced controlled release. 相似文献
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Sachin Kinge Dr. Mercedes Crego‐Calama Dr. David N. Reinhoudt Prof. Dr. 《Chemphyschem》2008,9(1):20-42
Nanoparticles are the focus of much attention due to their astonishing properties and numerous possibilities for applications in nanotechnology. For realising versatile functions, assembly of nanoparticles in regular patterns on surfaces and at interfaces is required. Assembling nanoparticles generates new nanostructures, which have unforeseen collective, intrinsic physical properties. These properties can be exploited for multipurpose applications in nanoelectronics, spintronics, sensors, etc. This review surveys different techniques, currently employed and being developed, for assembling nanoparticles in to ordered nanostructures. In this endeavour, the principles and methods involved in the development of assemblies are discussed. Subsequently, different possibilities of nanoparticle‐based nanostructures, obtained in multi‐dimensions, are presented. 相似文献
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Particle-stabilized dispersions such as emulsions, foams and bubbles are catching increasing attentions across a number of research areas. The adsorption mechanism and role of these colloidal particles in stabilizing the oil-water or gas-water interfaces and how these particles interact at interfaces are vital to the practical use of these dispersion systems. Although there have been intensive investigations, problems associated with the stabilization mechanisms and particle-particle interactions at interfaces still remain to explore. In this paper, we first systematically review the historical understanding of particle-stabilized emulsions or bubbles and then give an overview of the most important and well-established progress in the understanding of particle-stabilized systems, including emulsions, foams and liquid marbles. The particle-adsorption phenomena have long been realized and been discussed in academic paper for more than one century and a quantitative model was proposed in the early 1980s. The theory can successfully explain the adsorption of solid particles onto interface from energy reduction approaches. The stability of emulsions and foams can be readily correlated to the wettability of the particles towards the two phases. And extensive researches on emulsion stability and various strategies have been developed to prepared dispersion systems with a certain trigger such as pH and temperature. After that, we discuss recent development of the interactions between particles when they are trapped at the interface and highlight open questions in this field. There exists a huge gap between theoretical approaches and experimental results on the interactions of particles adsorbed at interfaces due to demanding experimental devices and skills. In practice, it is customary to use flat surfaces/interfaces as model surfaces to investigate the particle-particle at interfaces although most of the time interfaces are produced with a certain curvature. It is shown that the introduction of particles onto interfaces can generate charges at the interfaces which could possibly account for the long range electrostatic interactions. Finally, we illustrate that particle-stabilized dispersions have been found wide applications in many fields and applications such as microcapsules, food, biomedical carriers, and dry water. One of the most investigated areas is the microencapsulation of actives based on Pickering emulsion templates. The particles adsorbed at the interface can serve as interfacial stabilizers as well as constituting components of shells of colloidal microcapsules. Emulsions stabilized by solid particles derived from natural and bio-related sources are promising platforms to be applied in food related industries. Emulsion systems stabilized by solid particles of the w/w (water-in-water) feature are discussed. This special type of emulsion is attracting increasing attentions due to their all water features. Besides of oil-water interface, particle stabilized air-water interface share similar stabilization mechanism and several applications reported in the literature are subsequently discussed. We hope that this paper can encourage more scientists to engage in the studies of particle-stabilized interfaces and more novel applications can be proposed based on this mechanism 相似文献
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Yufeng Jiang Ramzi Chakroun Dr. Peiyang Gu Prof. André H. Gröschel Prof. Thomas P. Russell 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2020,132(31):12851-12855
Soft polymeric Janus nanoparticles (JNPs), made from polystyrene-b-poly(butadiene)-b-poly(methylmethacrylate), PS-PB-PMMA, triblock terpolymers, assemble into a monolayer at the water–oil interface to reduce interfacial tension. The extent to which the polymer chains can deform influences the packing density of the JNPs at the interface. The longer the polymer chains are relative to the core, the softer are the JNPs, resulting in a JNPs assembly with a lower initial lateral packing density. The interfacial activity of JNPs can be further tuned by complexation of the PMMA chains with lithium ions that are introduced into the water phase. This work provides a fundamental understanding of soft JNPs packing at the water–oil interface and provides a strategy to tailor the areal density of soft JNPs at liquid–liquid interface, enabling the design of smart responsive structured-liquid systems. 相似文献
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Dr. Wei Zheng Xiao-Lei Yang Dr. Gui-Yuan Wu Prof. Lin Cheng 《Chemistry (Weinheim an der Bergstrasse, Germany)》2020,26(51):11695-11700
In this work, well-defined two-dimensional metallacycles have been successfully employed for the well-controlled self-assembly of gold nanoparticles (AuNPs) into discrete clusters such as dimers, trimers, tetramers, pentamers and even hexamers at the water–oil interface for the first time. Furthermore, the modular construction of metallacycle molecules allows precise control of spacing between the gold nanoparticles. Interestingly, it was found that interparticle spacing below 5 nm created by molecular metallacycles in the resultant discrete gold nanoparticle clusters led to a strong plasmon coupling, thus inducing great field enhancement inside the gap between the NPs. More importantly, different discrete clusters with precise interparticle spacing provide a well-defined system for studying the hot-spot phenomenon in surface-enhanced Raman scattering (SERS); this revealed that the SERS effects were closely related to the interparticle spacing. 相似文献
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Yufeng Jiang Ramzi Chakroun Peiyang Gu Andr H. Grschel Thomas P. Russell 《Angewandte Chemie (International ed. in English)》2020,59(31):12751-12755
Soft polymeric Janus nanoparticles (JNPs), made from polystyrene‐b‐poly(butadiene)‐b‐poly(methylmethacrylate), PS‐PB‐PMMA, triblock terpolymers, assemble into a monolayer at the water–oil interface to reduce interfacial tension. The extent to which the polymer chains can deform influences the packing density of the JNPs at the interface. The longer the polymer chains are relative to the core, the softer are the JNPs, resulting in a JNPs assembly with a lower initial lateral packing density. The interfacial activity of JNPs can be further tuned by complexation of the PMMA chains with lithium ions that are introduced into the water phase. This work provides a fundamental understanding of soft JNPs packing at the water–oil interface and provides a strategy to tailor the areal density of soft JNPs at liquid–liquid interface, enabling the design of smart responsive structured‐liquid systems. 相似文献
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Dr. Loïc Leclercq Adrien Mouret Prof. Dr. Anna Proust Dr. Véronique Schmitt Dr. Pierre Bauduin Prof. Dr. Jean‐Marie Aubry Prof. Dr. Véronique Nardello‐Rataj 《Chemistry (Weinheim an der Bergstrasse, Germany)》2012,18(45):14352-14358
Decyl‐, dodecyl‐, and tetradecyltrimethylammonium cations were combined with the catalytic polyoxometalate [PW12O40]3? anion to give spherical and monodisperse nanoparticles that are able to stabilize emulsions in the presence of water and an aromatic solvent. This triphasic liquid/solid/liquid system, based on a catalytic surfactant, is particularly efficient as a reaction medium for epoxidation reactions that involve hydrogen peroxide. The reactions proceed at competitive rates with straightforward separation of the phases by centrifugation. Such catalytic “Pickering” emulsions combine the advantages of heterogeneous catalysis and biphasic catalysis without the drawbacks (e.g., catalyst leaching or separation time). 相似文献