Effect of the Nanoparticle Surface Termination on the Nanoparticle-Smectic Liquid Crystal Interaction: Order/Disorder Effect

纳米颗粒表面终止对纳米颗粒-近晶液晶相互作用的影响：有序/无序效应

• 批准号: 0906433
• 负责人: Luz Martinez-Miranda
• 金额: $ 36万
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-01 至 2013-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0906433&HistoricalAwards=false
• 关键词: Effect; Nanoparticle; Surface; Termination; Smectic

"This award is funded under the American Recovery and Reinvestment Act of 2009 (Public Law 111-5)."Technical summary: The proposal investigates how the surface termination of a nanoparticle affects the interaction between the liquid crystal and the nanoparticles. The systematic study of this system (liquid crystal/nanoparticle surface-termination/nanoparticle) is important for improved applications and biological applications. This system is interesting because the molecular spacing for the liquid crystals (3-4 nm) is comparable to the nanoparticles used. The nanoparticles can induce phase changes on the liquid crystals, depending on their surface or functionalization groups, and disorder the liquid crystal. The proposal will study the system as a function of 1. temperature; 2. liquid crystal film thickness; 3. particle concentration, both with and without and external magnetic field. These results will be compared with a phenomenological model that the P. I. has developed for the smectic-A phase ? nanoparticle ? surface coating system. The research has benefited from international collaborative work in the study of the heat capacitance of the system of nanoparticles/surface termination/liquid crystals as a function of temperature. The information obtained both from the heat capacitance and the x-ray study done in the present work will provide information on the disordering of the liquid crystal.Non-technical summary: Liquid crystals are important both for device and biological application. Liquid crystals are in TV?s, clocks and many other applications. They are also the phases of the walls of every living creature cell. The interaction of nanoparticles with liquid crystals is important to study since the molecular size of the liquid crystals is comparable to the nanoparticles. Inorganic nanoparticles are coated with an organic at their surface to improve their interaction with the organic liquid crystals and to identify specific cell walls in biological applications. This study investigates how the combination of the nanoparticle and their surface coating orders or disorders the liquid crystal, and can tell if the combination will be a disadvantage to applications or dangerous to living cells. Students working on this project will get an understanding of what has to be done to obtain better devices, and also what precautions have to be taking when using nanoparticles to interact with living creatures. The presentations done in professional and other meetings will inform the general public of these facts. Presentations to undergraduates and pre-college students will teach how liquid crystals appears in many aspects of their lives.

“该奖项是根据2009年的《美国回收与再投资法》（公法111-5）资助的。”技术摘要：该提案研究了纳米颗粒的表面终止如何影响液晶与纳米颗粒之间的相互作用。该系统的系统研究（液晶/纳米粒子表面末端/纳米颗粒）对于改善应用和生物应用非常重要。该系统很有趣，因为液晶的分子间距（3-4 nm）与所使用的纳米颗粒相当。纳米颗粒可以取决于其表面或功能化组，并使液晶诱导相变的相变。该提案将研究系统的函数1。温度； 2。液晶膜厚度； 3。颗粒浓度，无论有没有和没有外部磁场。这些结果将与P. I.为近晶型A期开发的现象学模型进行比较？纳米颗粒？表面涂料系统。这项研究受益于国际协作工作，研究纳米颗粒系统/表面终止/液晶的热能随温度的函数。从热电容和本工作中进行的X射线研究获得的信息将提供有关液晶无序的信息。没有技术总结：液晶对于装置和生物学应用都很重要。液晶在电视，时钟和许多其他应用中。它们也是每个生物细胞的墙壁的阶段。纳米颗粒与液晶的相互作用对于研究很重要，因为液晶的分子大小与纳米颗粒相当。无机纳米颗粒在其表面上涂有有机物，以改善其与有机液体晶体的相互作用，并在生物应用中鉴定特定的细胞壁。这项研究调查了纳米颗粒及其表面涂层订单或疾病的组合如何与液晶疾病，并且可以判断该组合是否对应用或对活细胞的危险构成劣势。从事该项目的学生将了解如何获得更好的设备，以及在使用纳米颗粒与生物互动时必须采取的预防措施。在专业会议和其他会议上进行的演讲将告知公众这些事实。向大学生和大学前学生的演讲将教授液晶在生活的许多方面的出现。