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Production and Characterization of Block Carbon Nanotubes

块状碳纳米管的生产和表征

基本信息

批准号：
1436532
负责人：
Brian Grady
金额：
$ 40.98万
依托单位：
University of Oklahoma Norman Campus
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2014
资助国家：
美国
起止时间：
2014-08-15 至 2018-07-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1436532&HistoricalAwards=false
关键词：
Production Characterization Block Carbon Nanotubes

项目摘要

The unique mechanical and electronic properties of carbon nanotubes result in their use in many important current and potential applications. Many of these applications rely on the chemical functionalization of the outer surface of the nanotubes to modify their properties. All previous methods involved functionalization of the entire nanotube. Here, we are establishing commercially-scalable procedures to modify segments of the nanotube resulting in what are referred to as block nanotubes. The lack of a large-volume manufacturing technique has prevented the realization of mass production of block nanotubes. We will demonstrate the potential for block nanotubes to be used in various applications such as polymer recycling, oil recovery, and biomass fuel production. Other applications including microelectronics, solar energy and biomaterials could also be impacted. The research project will involve participation of underrepresented groups, primarily Native Americans. A unique blog will be created to document graduate students' experiences working on the project and present a human face of scientists to the broad public. By presenting how the research is carried out from "start-to-finish," the blog is expected to stimulate students into undertaking a career in STEM disciplines.We plan to synthesize block nanotubes in a commercially-scalable fashion; for example a diblock nanotube would have one fraction of the nanotube with one chemistry and the other fraction with a second chemistry. Two scalable methods to manufacture block nanotubes will be developed. In one case, carbon nanotubes will be used as interfacial stabilizers (e.g. Pickering emulsions) and only those tube parts on the outside of the particles will be functionalized. In the other case, synthesis conditions in a fluidized bed containing flat surfaces impregnated with nanotube growth catalyst will be altered to change the surface chemistry as the tubes grow. Fundamental aspects to be studied in the former include tube length relative to droplet size and tube chemistry prior to modification; for the latter, fundamental aspects include reaction conditions and feed gas composition. Characterizing the spatial variation of nanotube surface chemistry will be performed via transmission electron microscopy and atomic force microscopy. We will test these tubes as interfacial stabilizers in polymer/polymer and oil/water systems, as well as biphasic catalyst supports under higher temperatures and pressures.

碳纳米管独特的机械和电子性能使其在许多重要的当前和潜在的应用中得到了应用。这些应用中的许多依赖于纳米管的外表面的化学官能化以改变其性质。所有以前的方法都涉及整个纳米管的功能化。在这里，我们正在建立商业规模的程序来修改纳米管的片段，从而产生所谓的块纳米管。大批量制造技术的缺乏阻碍了块状纳米管的大规模生产的实现。我们将展示嵌段纳米管在各种应用中的潜力，如聚合物回收，石油回收和生物质燃料生产。包括微电子、太阳能和生物材料在内的其他应用也可能受到影响。该研究项目将涉及代表性不足的群体，主要是美洲原住民的参与。将创建一个独特的博客，记录研究生在该项目上的工作经历，并向广大公众展示科学家的人性化面貌。通过展示研究是如何从“开始到结束”进行的，该博客有望激励学生从事STEM学科的职业生涯。我们计划以商业化的方式合成嵌段纳米管;例如，二嵌段纳米管将具有一种化学成分的纳米管的一部分，而另一部分具有第二种化学成分。将开发两种可扩展的方法来制造块纳米管。在一种情况下，碳纳米管将用作界面稳定剂（例如，皮克林乳液），并且仅颗粒外部的那些管部分将被官能化。在另一种情况下，将改变包含浸渍有纳米管生长催化剂的平坦表面的流化床中的合成条件，以随着管生长而改变表面化学。在前者中要研究的基本方面包括相对于液滴尺寸的管长度和改性之前的管化学;对于后者，基本方面包括反应条件和进料气体组成。表征纳米管表面化学的空间变化将通过透射电子显微镜和原子力显微镜进行。我们将测试这些管作为聚合物/聚合物和油/水体系中的界面稳定剂，以及在较高温度和压力下的两相催化剂载体。