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Understanding How Reaction Kinetics and Morphology Affect Photomechanical Molecular Crystals

了解反应动力学和形态如何影响光机械分子晶体

基本信息

批准号：
1810514
负责人：
Christopher Bardeen
金额：
$ 47.51万
依托单位：
University of California-Riverside
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-08-01 至 2025-01-31
项目状态：
未结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1810514&HistoricalAwards=false
关键词：
Understanding How Reaction Kinetics Morphology

项目摘要

Non-Technical Abstract:In this project funded by the Solid-State and Materials Chemistry Program of the Division of Materials Research, Professor Christopher Bardeen of the University of California, Riverside is using a combination of novel chemical methods and characterization techniques to take organic crystals closer to practical applications. Organic crystals composed of light-sensitive molecules can undergo a variety of light-induced shape changes such as bending, twisting, and coiling. These materials could have application across a broad range of fields spanning from engineering to medicine to cell biology, by making it possible to create microdevices powered by light. One example of such a device would be a light-powered swimmer for microsurgery or drug delivery. The application of these photomechanical materials is hampered by a limited understanding of how they work and how their performance can be optimized. The PI will address these challenges by controlling important parameters like molecular structure and crystal shape, while designing new optical experiments to examine how the light-induced changes occur inside the crystals. Technical Abstract:The creation of stable photoreactive molecules is a prerequisite for better performing materials. One phase of the research concentrates on making new molecules to make crystalline structures that can survive exposure to air and solvents. For example, the use of fluorine substitution will raise the molecular oxidation potential and may also enhance crystal plasticity. Molecular crystals can also exhibit nonlinear spatio-temporal reaction kinetics that can lead to autocatalysis, enhanced mechanical response, and oscillatory motion under steady-state illumination. Oscillatory motion can potentially be harnessed to provide locomotion for micro-swimmers. Along with new theoretical approaches, a novel standing-wave fluorescence experiment will be developed to directly probe the nonlinear reaction kinetics in single crystals. Finally, both bottom-up solution growth and top-down laser cutting will be used to create crystals with well-defined orientations and shapes. By controlling both crystal shape and the orientation of the strain tensor with respect to that shape, a detailed investigation into how both variables determine the crystal's response to light will become possible. The broader impacts of this work include potential societal impacts resulting from new materials that transform photons into mechanical motion and enable new devices. Participating graduate and undergraduate students will receive training in spectroscopy, materials characterization, and data analysis that will enable them to contribute in economically important areas like photonics. The PI will also continue ongoing outreach efforts at Taft Elementary School that impact hundreds of underrepresented minority students each year.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

非技术摘要：在这个由材料研究部门的固态和材料化学计划资助的项目中，加州大学滨江分校的Christopher Barnard教授正在使用新颖的化学方法和表征技术的组合，使有机晶体更接近实际应用。由光敏分子组成的有机晶体可以经历各种光诱导的形状变化，如弯曲、扭曲和卷曲。这些材料可以应用于从工程到医学再到细胞生物学的广泛领域，使制造由光驱动的微型设备成为可能。这种装置的一个例子是用于显微外科手术或药物输送的光动力游泳器。这些照相制版材料的应用受到对其工作原理以及如何优化其性能的有限理解的阻碍。 PI将通过控制分子结构和晶体形状等重要参数来应对这些挑战，同时设计新的光学实验来研究光诱导的变化如何在晶体内部发生。技术摘要：稳定的光反应分子的产生是获得更好性能材料的先决条件。研究的一个阶段集中在制造新的分子，以制造可以在暴露于空气和溶剂中生存的晶体结构。例如，使用氟取代将提高分子氧化电位，并且还可以增强晶体塑性。分子晶体还可以表现出非线性时空反应动力学，这可以导致自催化，增强的机械响应和稳态照明下的振荡运动。振荡运动可以潜在地被利用来为微型游泳者提供运动。沿着新的理论方法，将发展一种新的驻波荧光实验，直接探测单晶中的非线性反应动力学。最后，自下而上的溶液生长和自上而下的激光切割将用于创建具有明确取向和形状的晶体。通过控制晶体形状和应变张量相对于该形状的取向，详细研究这两个变量如何决定晶体对光的响应将成为可能。这项工作的更广泛影响包括新材料将光子转化为机械运动并使新设备成为可能所产生的潜在社会影响。参与的研究生和本科生将接受光谱学，材料表征和数据分析方面的培训，使他们能够在光子学等经济重要领域做出贡献。 PI还将继续在塔夫脱小学进行的外联工作，每年影响数百名代表性不足的少数民族学生。该奖项反映了NSF的法定使命，并被认为是值得通过使用基金会的智力价值和更广泛的影响力审查标准进行评估的支持。

项目成果

期刊论文数量（13）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Heterogeneous kinetics of photoinduced cross-linking of silica nanoparticles with surface-tethered anthracenes

DOI：
10.1016/j.cplett.2019.137059
发表时间：
2020-02
期刊：
Chemical Physics Letters
影响因子：
2.8
作者：
Seyed Hossein Mostafavi;M. Mettry;Adam D. Gill;Connor J. Easley;R. Hooley;C. Bardeen
通讯作者：
Seyed Hossein Mostafavi;M. Mettry;Adam D. Gill;Connor J. Easley;R. Hooley;C. Bardeen

Symmetry Breaking and Photomechanical Behavior of Photochromic Organic Crystals

光致变色有机晶体的对称性破缺和光机械行为

DOI：
10.3390/sym12091478
发表时间：
2020
期刊：
Symmetry
影响因子：
0
作者：
Kitagawa, Daichi;Bardeen, Christopher J.;Kobatake, Seiya
通讯作者：
Kobatake, Seiya

Photomechanical molecular crystals and nanowire assemblies based on the [2+2] photodimerization of a phenylbutadiene derivative

DOI：
10.1039/c9tc06946a
发表时间：
2020-04
期刊：
Journal of Materials Chemistry C
影响因子：
6.4
作者：
Fei Tong;Wenwen Xu;Tianyi Guo;Brandon F. Lui;R. Hayward;P. Palffy-Muhoray;R. Al‐Kaysi;C. Bardeen
通讯作者：
Fei Tong;Wenwen Xu;Tianyi Guo;Brandon F. Lui;R. Hayward;P. Palffy-Muhoray;R. Al‐Kaysi;C. Bardeen

Mechanical Properties and Photomechanical Fatigue of Macro- and Nanodimensional Diarylethene Molecular Crystals