A Suite of Undergraduate Laboratories Focused on Surface and Interface Science

一系列专注于表面和界面科学的本科实验室

• 批准号: 9850822
• 负责人: Gary Blanchard
• 金额: $ 6.41万
• 依托单位: Michigan State University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-08-15 至 2000-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9850822&HistoricalAwards=false
• 关键词: Suite; Undergraduate; Laboratories; Focused; Surface

Many of the breakthroughs in modern interdisciplinary science occur at interfaces between two phases of matter. Unfortunately, the undergraduate chemistry laboratory curriculum at many institutions offers little in the way of enhancing the student's understanding of interfaces. The MSU undergraduate curriculum offers a solid foundation in the traditional areas such as wet chemical quantitative analysis, instrumental analysis, a variety of spectroscopic measurements, chromatography and separations science and electrochemistry. At present, there is little opportunity for undergraduate students to gain experience in state of the art surface and interface science within the laboratory or course sequence at MSU. An archetypal interfacial system is used for these undergraduate experiments; alkanethiols on gold. These compounds easily form highly reproducible interfaces. The initial adsorption process for the monolayers is rapid and is dominated by Au-S interactions while longer term monolayer structural formation is mediated by aliphatic chain annealing. Students perform a suite of experiments to access these separate monolayer formation steps as well as the steady state properties of the monolayers. The first experiment monitors the growth of the monolayer in real time using a quartz crystal microbalance. This technique also allows for the direct measurement of the Gibbs energy of initial adsorption of alkanethiols onto gold and demonstrates graphically the reversible nature of this adsorption. The second experiment measures the layer thickness and extent of organization using FTIR and optical ellipsometry. To relate these experiments to physical properties of interfaces, students characterize the monolayers using the traditional interface methods of cyclic voltammetry and contact angle measurements. These experiments offer students an experience ranging from traditional characterization to state of the art monolayer spectroscopy on a single well-characterized chemical system.

现代跨学科科学的许多突破都发生在物质两相之间的界面上。不幸的是，在许多机构的本科化学实验室课程提供的方式，以提高学生的理解接口很少。MSU本科课程在传统领域提供了坚实的基础，如湿化学定量分析，仪器分析，各种光谱测量，色谱和分离科学以及电化学。目前，本科生几乎没有机会在MSU的实验室或课程序列中获得最先进的表面和界面科学的经验。 一个原型的界面系统是用于这些本科生的实验;烷硫醇金。这些化合物容易形成高度可再现的界面。单分子膜的初始吸附过程是快速的，主要由Au-S相互作用，而较长期的单分子膜结构的形成是由脂肪链退火介导的。学生进行一套实验，以访问这些单独的单分子层形成步骤以及单分子层的稳态特性。第一个实验使用石英晶体微天平在真实的时间内监测单层的生长。该技术还允许直接测量的吉布斯自由能的初始吸附的烷硫醇到金，并以图形方式证明这种吸附的可逆性。第二个实验使用FTIR和光学椭圆偏振法测量层厚度和组织程度。为了将这些实验与界面的物理性质联系起来，学生们使用传统的循环伏安法和接触角测量的界面方法来表征单分子膜。这些实验为学生提供了一个经验，从传统的表征，以最先进的单层光谱在一个单一的良好表征的化学系统。