Thermodynamics, Nanostructures, and Transport Properties of Confined Colloid-Polymer Mixtures
受限胶体聚合物混合物的热力学、纳米结构和输运特性
基本信息
- 批准号:1034421
- 负责人:
- 金额:$ 30万
- 依托单位:
- 依托单位国家:美国
- 项目类别:Standard Grant
- 财政年份:2010
- 资助国家:美国
- 起止时间:2010-09-01 至 2013-08-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
1034421RobertThis project involves the study of several challenging sub-projects related to the equilibrium and transport properties of confined colloid-polymer mixtures (monolayers and channels). First, the PI will investigate experimentally by the Langmuir-Blodgett method the phase behavior of monolayers of colloid/polymer mixtures. The nanostructures of these monolayers will be determined by atomic force microscopy and Brewster angle microscopy. Secondly, a theoretical model will be developed based on that of McMillan to understand the phase transitions of these systems. Lastly, the PI will determine by florescence light microscopy the diffusion of polymer in channels as well as the diffusion of a pair of polymers in colloidal suspensions confined to narrow channels. Intellectual Merit of the Proposed Activity In the investigations of monolayers of colloid-polymer mixtures, a theory will be developed in order to describe the structure of the possible liquid-crystalline ordering of the polymers and the evidence garnered from the proposed experiments will be used to test the theoretical model. The theory will be modified if it fails to agree with the experiments, and the experimental parameters will be implemented in our theory. The details of experimental study of dynamics of polymer in channels will be investigated. The measurement resolution and uncertainty quantification are those of enhanced video fluorescent microscopy. The connection between theory and experiment for one-dimensional polymer diffusion will be studied. The theory of polymer diffusion in the presence of colloids in one-dimensional channels was developed in our previous NSF grant, and the coefficient of diffusivity was expressed in terms of the molecular parameters of the polymer, the size of the colloids, and the viscosity of the solvent. Since these quantities are directly measurable, our experiments will be directly connected to theory.The problems that will be studied are challenging fundamental ones which require expertise in thermodynamics, statistical thermodynamics, theoretical and experimental physical chemistry and condensed matter physics. In particular, the experimental investigations of Langmuir-Blodgett monolayers of colloid-polymer mixtures will determine their phase transitions and shed light on unsolved problems related to depletion effects in confined geometries. The proposed activity is fundamental in nature, but it is inspired by and is beneficial to the numerous technological applications which involve self-assemblies of nano-particles and mixtures of colloids and polymers which are described in the proposal. These diverse fields of expertise required make it an interdisciplinary study not usually carried out by a single PI. Broader Impacts Resulting from the Proposed Activity In addition to the PI's graduate students, several of which have become professors at first-rate universities, a large number of undergraduate students will take part in the proposed activity, and several will make presentations at national and regional scientific meetings and become coauthors of publications, as has been the case under the previous NSF grant. Such integration and encouragement proves very effective in making undergraduate students of the PI, including many women, decide to go to graduate school in chemical engineering and in allied disciplines. The top undergraduate sophomore student at Rice University, a woman, has already expressed her interest in joining the group. The PI will continue to be involved in several outreach programs of Rice University, in which he discusses this proposed activity in understandable terms with middle and high school teachers and students, in predominantly African-American and Hispanic public schools of Houston, those most largely underrepresented in academia. The PI will pursue his efforts to convince them of the intimate bond between scientific and societal progress. The PI will also maintain the summer visits to his laboratory in which, during one week, several middle school students in the summer take part in research.
1034421罗伯特这个项目涉及到几个具有挑战性的子项目的研究有关的平衡和运输性能的限制胶体聚合物混合物(单层和通道)。首先,PI将通过Langmuir-Blodgett方法实验研究胶体/聚合物混合物单层的相行为。这些单层的纳米结构将通过原子力显微镜和布鲁斯特角显微镜来确定。第二,我们将在McMillan的基础上建立一个理论模型来理解这些系统的相变。最后,PI将通过荧光光学显微镜确定聚合物在通道中的扩散以及一对聚合物在局限于狭窄通道的胶体悬浮液中的扩散。在研究胶体-聚合物混合物的单层时,将发展一种理论,以描述聚合物可能的液晶有序结构,从拟议的实验中获得的证据将用于检验理论模型。 如果理论与实验不一致,则对理论进行修正,并将实验参数应用到我们的理论中。详细的实验研究的聚合物在通道中的动力学将被调查。测量分辨率和不确定度量化是增强型视频荧光显微镜。研究一维高分子扩散的理论与实验之间的联系。在我们以前的NSF补助金中开发了一维通道中存在胶体的聚合物扩散理论,扩散系数用聚合物的分子参数、胶体的尺寸和溶剂的粘度表示。 由于这些量是可以直接测量的,我们的实验将直接与理论联系起来。将要研究的问题是具有挑战性的基础问题,需要热力学,统计热力学,理论和实验物理化学以及凝聚态物理学的专业知识。特别是,朗缪尔-布洛杰特单分子膜的胶体聚合物混合物的实验研究将确定其相变,并阐明未解决的问题有关的限制几何形状的耗尽效应。 拟议的活动本质上是基本的,但它受到了提案中描述的涉及纳米颗粒和胶体与聚合物混合物自组装的众多技术应用的启发,并对其有益。这些不同领域的专业知识使其成为一项跨学科的研究,通常不是由一个PI进行的。除了PI的研究生,其中一些人已经成为一流大学的教授,大量的本科生将参加拟议的活动,一些人将在国家和地区科学会议上发表演讲,并成为出版物的共同作者,就像以前的NSF资助一样。事实证明,这种融合和鼓励非常有效地促使PI的本科生,包括许多女生,决定进入化学工程和相关学科的研究生院。莱斯大学的一名女大二学生已经表示有兴趣加入该组织。 PI将继续参与赖斯大学的几个推广计划,在这些计划中,他将以可理解的方式与休斯敦主要由非洲裔美国人和西班牙裔公立学校的初中和高中教师和学生讨论这项拟议的活动,这些学校在学术界的代表性最低。PI将继续努力说服他们科学和社会进步之间的密切联系。PI还将保持对他的实验室的夏季访问,在为期一周的时间里,几名中学生在夏季参加研究。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Marc Robert其他文献
Confined molecular catalysts provide an alternative interpretation to the electrochemically reversible demetallation of copper complexes
受限分子催化剂为铜配合物的电化学可逆脱金属化提供了另一种解释。
- DOI:
10.1038/s41467-022-31661-1 - 发表时间:
2022-07-22 - 期刊:
- 影响因子:15.700
- 作者:
Etienne Boutin;Aude Salamé;Marc Robert - 通讯作者:
Marc Robert
Four-electron reduction of COsub2/sub: from formaldehyde and acetal synthesis to complex transformations
二氧化碳的四电子还原:从甲醛和缩醛合成到复杂转化
- DOI:
10.1039/d4sc02888k - 发表时间:
2024-09-25 - 期刊:
- 影响因子:7.400
- 作者:
Sarah Desmons;Julien Bonin;Marc Robert;Sébastien Bontemps - 通讯作者:
Sébastien Bontemps
Journey to 1-Million Steps: A Retrospective Case Series on Implementation of Robotic Assisted Gait Training into an Outpatient Pediatric Clinic
- DOI:
10.1016/j.apmr.2024.02.170 - 发表时间:
2024-04-01 - 期刊:
- 影响因子:
- 作者:
Stephanie Kolakowsky-Hayner;Brittany Dierwechter;Rhonda Tucker;Marc Robert - 通讯作者:
Marc Robert
Highlights and challenges in the selective reduction of carbon dioxide to methanol
二氧化碳选择性还原制甲醇的亮点与挑战
- DOI:
10.1038/s41570-021-00289-y - 发表时间:
2021-06-24 - 期刊:
- 影响因子:51.700
- 作者:
Sara Navarro-Jaén;Mirella Virginie;Julien Bonin;Marc Robert;Robert Wojcieszak;Andrei Y. Khodakov - 通讯作者:
Andrei Y. Khodakov
Carbon nanotube heterogenization improves cobalt pyridyldiimine complex COsub2/sub reduction activity in aqueous carbonate buffer
碳纳米管杂化提高了在碳酸盐水溶液缓冲液中钴吡啶二亚胺配合物对二氧化碳的还原活性
- DOI:
10.1039/d4cc00629a - 发表时间:
2024-05-07 - 期刊:
- 影响因子:4.200
- 作者:
Baptiste Andrin;Paulo Jorge Marques Cordeiro Junior;David Provost;Stéphane Diring;Yann Pellegrin;Marc Robert;Fabrice Odobel - 通讯作者:
Fabrice Odobel
Marc Robert的其他文献
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{{ truncateString('Marc Robert', 18)}}的其他基金
Colloid-Polymer Systems: Statics and Dynamics
胶体聚合物系统:静力学和动力学
- 批准号:
0327487 - 财政年份:2003
- 资助金额:
$ 30万 - 项目类别:
Continuing Grant
Phase Separation and Interfaces of Confined Aqueous Colloidal Systems
密闭水胶体体系的相分离和界面
- 批准号:
9700147 - 财政年份:1997
- 资助金额:
$ 30万 - 项目类别:
Standard Grant
Wetting Properties of Surfactant Systems
表面活性剂体系的润湿性能
- 批准号:
8813966 - 财政年份:1988
- 资助金额:
$ 30万 - 项目类别:
Continuing Grant
US-France Cooperative Research: Phase Separation and Wettingin Binary Fluids
美法合作研究:二元流体的相分离和润湿
- 批准号:
8612886 - 财政年份:1987
- 资助金额:
$ 30万 - 项目类别:
Standard Grant
Research Initiation: Thermodynamics and Statistical Mechanics of Fluid Interfaces
研究启动:流体界面热力学和统计力学
- 批准号:
8505213 - 财政年份:1985
- 资助金额:
$ 30万 - 项目类别:
Standard Grant
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