UNS: Liquid crystal templated three-dimensional nanoparticle assemblies

UNS：液晶模板三维纳米颗粒组件

• 批准号: 1507551
• 负责人: Linda Hirst
• 金额: $ 41万
• 依托单位: University of California - Merced
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-09-15 至 2019-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1507551&HistoricalAwards=false
• 关键词: UNS; Liquid; crystal; templated; three

CBET - 1507551PI: Hirst, LindaThe goal of this project is to design and characterize new microcapsules that have multifunctional capabilities. The fabrication of the microcapsules is based on the self-assembly of nanoparticles that uses liquid crystals to direct the assembly. Liquid crystals are ordered fluids that are best known for their use in computer displays. The nanoparticles are modified so that they form nanoparticle-rich liquid crystal droplets. These droplets act as a template for the self-assembly of nanoparticles into spherical shells, which can then be used in a variety of applications, including fluid photonic devices and molecular encapsulation and release. The investigators will use the project to develop new physics laboratory modules to introduce undergraduates to nanoscience, and the research team will expand its outreach to the public by organizing community college level workshops in nanotechnology.This project will design custom nanoparticle (NP) 3D assemblies using a liquid crystal (LC) based self-assembly method. A new technique will be explored to form thin shells of closely packed quantum dots ranging in diameter from 200 nanometers to 5 microns with walls that vary in thickness from 20 to 100 nanometers. The fabrication process is controlled by a liquid crystal phase transition. A nematic liquid crystal acts as the host phase into which mesogen-functionalized NPs (semiconducting, metallic and magnetic particles) are dispersed. The particles are surface-modified to incorporate a mesogenic (LC-like) ligand. Mesogen-functionalized NPs are an emerging class of materials that can assemble in LC/NP hybrid phases. Once formed, the capsules can be extracted from the host nematic phase and re-dispersed in different solvents for a variety of applications. The project goals are to design different NPs with mesogenic ligands using semiconducting, metallic and magnetic nanoparticles for 3D assembly in a host liquid crystal phase, fully elucidating the controlling parameters in the assembly process, and developing this new assembly method to create and test unique photonic structures and active multifunctional capsules.

CBET -1507551PI：该项目的Lindathe目标是设计和表征具有多功能功能的新的微胶囊。 微胶囊的制造是基于使用液晶来指导组件的纳米颗粒的自组装。 液晶是有序的流体，以其在计算机显示器中的使用而闻名。 修饰纳米颗粒，使它们形成富含纳米颗粒的液晶液滴。 这些液滴充当纳米颗粒自组装到球形壳中的模板，然后可以在各种应用中使用，包括流体光子设备以及分子封装和释放。研究人员将利用该项目开发新的物理实验室模块，以向纳米科学介绍本科生，研究团队将通过组织纳米技术的社区大学水平研讨会来扩展其向公众扩展其外展。该项目将使用基于液晶（LC）基于液晶自动化方法设计自定义纳米粒子（NP）3D组件。 将探索一种新技术，以形成薄壳的薄壳，这些壳的直径从200纳米到5微米，其壁的厚度从20至100纳米不等。制造过程由液晶相变控制。 列液晶充当宿主相位，其中介素官能化的NP（半导体，金属和磁性颗粒）被分散。颗粒进行表面修饰以掺入中源性（LC）配体。中肌官能化的NP是可以在LC/NP杂种相中组装的新兴材料。一旦形成，可以从宿主列中提取胶囊，并在不同的溶剂中重新分散以进行多种应用。项目目标是使用半导体，金属和磁性纳米颗粒在宿主液晶相中使用半导体，金属和磁性纳米颗粒设计不同的NP，并在装配过程中充分阐明控制参数，并开发这种新的组装方法来创建和测试独特的光子结构和主动多功能型胶囊。

项目成果

Directed assembly of magnetic and semiconducting nanoparticles with tunable and synergistic functionality

• DOI: 10.1038/s41598-019-52154-0
• 发表时间: 2019-10-31
• 期刊: SCIENTIFIC REPORTS
• 影响因子: 4.6
• 作者: Bartolo, Mark;Amaral, Jussi J.;Ghosh, Sayantani
• 通讯作者: Ghosh, Sayantani

New Promesogenic Ligands for Host Medium Microencapsulation by Quantum Dots via Liquid Crystal Phase Transition Templating

• DOI: 10.1021/acsanm.9b00476
• 发表时间: 2019-03
• 期刊: ACS Applied Nano Materials
• 影响因子: 5.9
• 作者: A. Keshavarz;Sheida T. Riahinasab;L. Hirst;B. Stokes

Nanoparticle-based hollow microstructures formed by two-stage nematic nucleation and phase separation

通过两阶段向列成核和相分离形成的纳米颗粒空心微结构

• DOI: 10.1038/s41467-019-08702-3
• 发表时间: 2019
• 期刊: Nature Communications
• 影响因子: 16.6
• 作者: Riahinasab, Sheida T.;Keshavarz, Amir;Melton, Charles N.;Elbaradei, Ahmed;Warren, Gabrielle I.;Selinger, Robin L.;Stokes, Benjamin J.;Hirst, Linda S.
• 通讯作者: Hirst, Linda S.