Ordering and Helical Structures of Nanoparticles in Block Copolymers

嵌段共聚物中纳米颗粒的有序和螺旋结构

• 批准号: 259030848
• 负责人: Professor Dr. Jens-Uwe Sommer
• 金额: --
• 依托单位: Leibniz-Institut für Polymerforschung Dresden (IPF)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/259030848?language=en
• 关键词: Ordering; Helical; Structures; Nanoparticles; Block

The aim of the proposed project is the control of complex structures formed by nanoparticles (NP) under block copolymer (BCP) confinement which surprisingly are observed. The purpose is to drive the nanoparticles inside of one of the BCP domains and, by exploiting confinement effects provided by BCP template, induce the nanoparticle self-assembly to form well-defined structures. Helical structures composed of optically active nanoparticles, such as silver or gold, are of particular interest. The nanoparticles will be synthesized and functionalized with polymer layer and then mixed with block copolymers to obtain NP/BCP composites with domain-selective NP arrangement. Our recent experimental results clearly demonstrate that under BCP confinement nanoparticles can self-assemble to form helical structures. There is limited information, however, about the possible mechanisms and parameters which determine and influence the helix formation. The ratio between the BCP domain size (host) and nanoparticle size (guest), the chain length and grafting density of particle-tethered polymer, the selectivity of solvent would play an important role. These parameters will be systematically varied and their impact on formation of NP helical structures under BCP confinement will be studied. With the aid of selective solvents NP/BCP composites will be converted into isolated nanoobjects, (i.e. nanofibers) bearing the nanoparticles assembled into helical structures. We expect that NP/BCP composites with helical nanoparticles assemblies may display specific optical properties, such as optical dichroic or light polarisation properties. Computer simulations will be used to guide structure formation in this multi-dimensional parameter space and provide an understanding of the self-assembly of nanoparticles under the block copolymer confinement. Here, both strongly selective solvents and the bulk phase of copolymers will be considered. The combination of experiment and simulation will help to understand details of formation of nanoparticle. We expect that this project can lead to the development of new functional materials with optical properties which can be tuned by the environment and by chemistry.

该项目的目标是控制在嵌段共聚物(BCP)限制下由纳米粒子(NP)形成的复杂结构，这些结构令人惊讶地被观察到。其目的是将纳米粒子驱动到BCP结构域中的一个区域内，并利用BCP模板提供的限制效应，诱导纳米粒子自组装形成定义良好的结构。由光学活性纳米粒子(如银或金)组成的螺旋结构尤其令人感兴趣。纳米粒子将被合成并与聚合物层功能化，然后与嵌段共聚物混合，得到具有结构域选择性的NP排列的NP/BCP复合材料。我们最近的实验结果清楚地表明，在BCP约束下，纳米颗粒可以自组装形成螺旋结构。然而，关于决定和影响螺旋形成的可能机制和参数的信息有限。BCP结构域大小(主体)与纳米粒子大小(客体)之比、链长和接枝密度、溶剂的选择性将起到重要作用。这些参数将被系统地改变，并将研究它们对BCP约束下NP螺旋结构形成的影响。在选择性溶剂的辅助下，NP/BCP复合材料将转化为孤立的纳米对象(即纳米纤维)，承载着组装成螺旋结构的纳米颗粒。我们预计，带有螺旋纳米粒子组装的NP/BCP复合材料可能会显示出特殊的光学性质，如光学二向色性或光偏振性质。计算机模拟将被用来指导在这个多维参数空间中的结构形成，并提供对嵌段共聚限制下纳米粒子自组装的理解。在这里，将同时考虑强选择性溶剂和共聚物的本体相。实验和模拟的结合将有助于理解纳米粒子的形成细节。我们期待这一项目能够开发出具有光学性质的新型功能材料，这种材料可以通过环境和化学来调节。

项目成果

Hairy Core-Shell Polymer Nano-objects from Self-Assembled Block Copolymer Structures.

• DOI: 10.1021/am5075503
• 发表时间: 2015-01
• 期刊: ACS applied materials & interfaces
• 影响因子: 9.5
• 作者: Bhanu Nandan;A. Horechyy

Fabrication of titania nanostructures using core–shell polymer nanofibers from block copolymers as templates

• DOI: 10.1016/j.nanoso.2016.01.001
• 发表时间: 2016-04
• 期刊: Nano-Structures and Nano-Objects
• 作者: Sunita Sanwaria;Sajan Singh;A. Horechyy;P. Formánek;M. Stamm;R. Srivastava;Bhanu Nandan

Multifunctional core–shell polymer–inorganic hybrid nanofibers prepared via block copolymer self-assembly

• DOI: 10.1039/c5ra17161j
• 发表时间: 2015-10
• 期刊: RSC Advances
• 影响因子: 3.9
• 作者: Sunita Sanwaria;Sajan Singh;A. Horechyy;P. Formánek;M. Stamm;R. Srivastava;Bhanu Nandan

Silica-supported Au@hollow-SiO2 particles with outstanding catalytic activity prepared via block copolymer template approach.

• DOI: 10.1016/j.jcis.2016.12.051
• 发表时间: 2017-04
• 期刊: Journal of colloid and interface science
• 影响因子: 9.9
• 作者: A. Shajkumar;Bhanu Nandan;Sunita Sanwaria;V. Albrecht;M. Libera;Myong-Hoon Lee;G. Auffermann;M. Sta

Ligand displacement induced morphologies in block copolymer/quantum dot hybrids and formation of core-shell hybrid nanoobjects.

• DOI: 10.1039/c7cp04343k
• 发表时间: 2017-10
• 期刊: Physical chemistry chemical physics : PCCP
• 作者: Sajan Singh;Pratick Samanta;R. Srivastava;A. Horechyy;U. Reuter;M. Stamm;Hsin‐Lung Chen;Bhanu Nandan