CAREER: A Few Layer Thin, Graphene-Based Membranes: Nanostructure Understanding, Permeation Mechanisms and Separation Applications

职业：几层薄石墨烯膜：纳米结构理解、渗透机制和分离应用

• 批准号: 1837813
• 负责人: Miao Yu
• 金额: $ 35.12万
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2017
• 资助国家: 美国
• 起止时间: 2017-11-01 至 2021-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1837813&HistoricalAwards=false
• 关键词: CAREER; Few; Layer; Thin; Graphene

1451887YuUniversity of Sourth Carolina at ColumbiaThe goal of this proposed research is to rationally design few layer thin (thickness 3 nm), graphene-based membranes, understand their nanostructures and permeation mechanisms, and study their potential for selective, high flux separation of a wide range of mixtures. This proposed research is expected to have great scientific as well as technological impact on mixture separations and has great potential to revolutionize separation using membrane technology. If successful, this new generation ultrathin membranes with tunable material properties, membrane nanostructures, and structural defects sizes will have wide applications for high throughput mixture separations, including gas separation, liquid mixture separation, and nanofiltration, etc., and thus greatly reduce energy cost in separations. It is anticipated that this study could serve as a model for the rational design of ultrathin, graphene-based membranes with tunable membrane performance. In addition, the obtained fundamental understanding and knowledge on graphene-based coating deposition and coating nanostructures may have potential impact on optoelectronics applications, such as touch screens and organic light emitting diodes (OLEDs), energy storage, and photovoltaic cells. Ultrathin membranes with rationally designed and optimized nanostructures have great potential to achieve effective mixture separation with high throughput. The proposed research will focus on fabrication, nanostructure clarification, and separation study of a few layer thin, graphene-based membranes. The objectives of the proposed research are i) applying liquid phase deposition processes to controllably deposit a few layer thin, graphene-based membranes; ii) elucidating the nanostructures of fabricated membranes and correlating the deposition parameters with the resulting nanostructures; iii) understanding permeation mechanisms of molecules through the a few layer thin membranes and investigating various etching processes on controlling pore sizes; and iv) exploring the separation potential of a few layer thin, graphene-based membranes for various gas and liquid mixtures. We will deposit graphene oxide (GO) flakes with controlled properties on appropriate porous substrates by vacuum filtration, dip-coating, and casting-evaporation; employ both macroscopic and microscopic techniques to characterize the nanostructures of deposited thin coatings/membranes; explore molecular transport pathways through GO and reduced GO (rGO), including interlayer spacing and structural defects, by gas, vapor and liquid permeation; study the separation of mixtures by pressurized gas permeation, pervaporation and liquid filtration. The PI proposes the integration of research and education through advancement of the education of all students in the STEM fields with special emphasis on enhancing retention of minority students in this population. The PI has leveraged a number of existing programs at USC to provide organizational structure and to resource the various activities. Specifically, the PI plans(1) the development of a special topics graduate class in the study area, (2) try to recruit a GEM scholar as a PhD mentee, (3) host 2 URM undergraduate researchers per year, (4) participate in K-12 outreach organized by USC and develop a continuous relationship with one minority serving high school that will include 4 visits from the PI each year.

145188777777在哥伦比亚的Carolina yuuniversity这项拟议的研究的目标是合理地设计几层薄（厚度为3 nm），基于石墨烯的膜，了解其纳米结构和渗透机制，并研究它们的潜力，可以选择性地分离宽范围的混合物。 预计这项拟议的研究将对混合分离具有巨大的科学和技术影响，并具有巨大的潜力，可以使用膜技术彻底改变分离。如果成功，则具有可调材料特性，膜纳米结构和结构缺陷尺寸的新一代超薄膜将在高吞吐量混合物分离中具有广泛的应用，包括气体分离，液体混合物分离和纳米滤过等，从而大大降低分离中的能量成本。可以预料，这项研究可以作为具有可调膜性能的超薄基于石墨烯的膜合理设计的模型。此外，对基于石墨烯的涂层沉积和涂料纳米结构获得的基本理解和知识可能会对光电应用的潜在影响，例如接触屏和有机光发射二极管（OLEDS），能量存储和光伏细胞。 具有理性设计和优化的纳米结构具有巨大潜力的超薄膜具有高吞吐量的有效混合物分离。拟议的研究将集中于制造，纳米结构澄清以及一些基于石墨烯的膜的分离研究。拟议研究的目标是i）应用液相沉积过程，以控制几层薄的基于石墨烯的膜； ii）阐明制造膜的纳米结构并将沉积参数与所得纳米结构相关联； iii）通过几层薄膜理解分子的渗透机制，并研究控制孔径的各种蚀刻过程； iv）探索几层基于石墨烯的膜的分离潜力，用于各种气体和液体混合物。我们将通过真空过滤，浸入涂层和铸造蒸发量将具有控制性能的石墨烯（GO）薄片放在适当的多孔底物上。同时采用宏观和微观技术来表征沉积的薄涂层/膜的纳米结构；通过GO和减少GO（RGO）探索分子传输途径，包括层间间距和结构缺陷，气体，蒸气和液体渗透；通过加压气体渗透，透化和液体过滤研究混合物的分离。 PI建议通过在STEM领域的所有学生的教育发展进行研究和教育，特别强调加强该人群中少数族裔学生的保留。 PI利用了USC的许多现有计划来提供组织结构并资源各种活动。具体来说，PI计划（1）在研究领域开发特殊主题研究生班，（2）尝试招募一名Gem Scholar作为博士学位指导者，（3）主持每年的2个URM本科研究人员，（4）参加由USC组织的K-12外展活动，并与每年的少数民族服务的高中持续关系，其中包括4年级的少数派服务，其中包括4年级的Visits，其中包括PI PI的4年级。