当前位置：
X-MOL 学术
›
Adv. Funct. Mater.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Photoswitchable Nanomaterials Based on Hierarchically Organized Siloxane Oligomers
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-11-07 , DOI: 10.1002/adfm.201703952 R. Helen Zha 1 , Ghislaine Vantomme 1 , José Augusto Berrocal 1 , Ronald Gosens 1 , Bas de Waal 1 , Stefan Meskers 1 , E. W. Meijer 1
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2017-11-07 , DOI: 10.1002/adfm.201703952 R. Helen Zha 1 , Ghislaine Vantomme 1 , José Augusto Berrocal 1 , Ronald Gosens 1 , Bas de Waal 1 , Stefan Meskers 1 , E. W. Meijer 1
Affiliation
|
Materials with highly ordered molecular arrangements have the capacity to display unique properties derived from their nanoscale structure. Here, the synthesis and characterization of azobenzene (AZO)‐functionalized siloxane oligomers of discrete length that form photoswitchable supramolecular materials are described. Specifically, synergy between phase segregation and azobenzene crystallization leads to the self‐assembly of an exfoliated 2D crystal that becomes isotropic upon photoisomerization with UV light. Consequently, the material undergoes a rapid athermal solid‐to‐liquid transition which can be reversed using blue light due to the unexpectedly fast 2D crystallization that is facilitated by phase segregation. In contrast, enabling telechelic supramolecular polymerization through hydrogen bonding inhibits azobenzene crystallization, and nanostructured pastes with well‐ordered morphologies are obtained based on phase segregation alone, thus demonstrating block copolymer‐like behavior. Therefore, by tailoring the balance of self‐assembly forces in the azobenzene‐functionalized siloxane oligomers, fast and reversible phase‐changing materials can be engineered with various mechanical properties for applications in photolithography or switchable adhesion to lubricant properties.
中文翻译：
基于分层组织硅氧烷低聚物的光开关纳米材料
具有高度有序的分子排列的材料具有显示源自其纳米级结构的独特性能的能力。在此，描述了形成光可切换的超分子材料的离散长度的偶氮苯（AZO）功能化的硅氧烷低聚物的合成和表征。具体而言，相分离和偶氮苯结晶之间的协同作用会导致脱落的2D晶体的自组装，该2D晶体在通过紫外线进行光异构化后变为各向同性。因此，该材料经历了快速的无热固-液转变，由于相分离促进了出乎意料的快速2D结晶，可以使用蓝光将其逆转。相反，通过氢键实现远螯超分子聚合可抑制偶氮苯结晶，仅基于相分离就可以获得形态良好的纳米结构糊，从而证明了嵌段共聚物的行为。因此，通过调整偶氮苯官能化硅氧烷低聚物中自组装力的平衡，可以设计出具有多种机械性能的快速可逆相变材料，以用于光刻或对润滑剂性能的可切换粘合性。
更新日期：2017-11-07
中文翻译：
基于分层组织硅氧烷低聚物的光开关纳米材料
具有高度有序的分子排列的材料具有显示源自其纳米级结构的独特性能的能力。在此，描述了形成光可切换的超分子材料的离散长度的偶氮苯（AZO）功能化的硅氧烷低聚物的合成和表征。具体而言，相分离和偶氮苯结晶之间的协同作用会导致脱落的2D晶体的自组装，该2D晶体在通过紫外线进行光异构化后变为各向同性。因此，该材料经历了快速的无热固-液转变，由于相分离促进了出乎意料的快速2D结晶，可以使用蓝光将其逆转。相反，通过氢键实现远螯超分子聚合可抑制偶氮苯结晶，仅基于相分离就可以获得形态良好的纳米结构糊，从而证明了嵌段共聚物的行为。因此，通过调整偶氮苯官能化硅氧烷低聚物中自组装力的平衡，可以设计出具有多种机械性能的快速可逆相变材料，以用于光刻或对润滑剂性能的可切换粘合性。
京公网安备 11010802027423号