SGER: Liquid Crystals as Stimulus-Responsive Media for Dynamic Mediation of Chemical Separations, Application to Carbon Mitigation

SGER：液晶作为化学分离动态调节的刺激响应介质，在碳减排中的应用

• 批准号: 0086598
• 负责人: Trevor Hatton
• 金额: $ 5万
• 依托单位: Massachusetts Institute of Technology
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-01 至 2001-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0086598&HistoricalAwards=false
• 关键词: SGER; Liquid; Crystals; Stimulus; Responsive

ABSTRACTProposal No.: CTS-0080915Proposal Type: Investigator Initiated- SGERPrincipal Investigator: T. Alan HattonInstitution: Massachusetts Institute of TechnologySGER: Liquid Crystals as Stimulus-Responsive Media for Dynamic Mediation of Chemical SeparationsThis project explores new concepts for the dynamic mediation of chemical separations by use of liquid crystals as adsorbents. With these materials small changes in external stimuli can causemajor changes in fluid or interfacial structure that change significantly the capacity of the separations media for targeted solutes. Specifically, the influence of changing electric or magnetic fields on thermotropic liquid crystals near their smectic/nematic/isotropic transition regions is exploited to control the capacity and selectivity of gas separations. This work is intended to provide an initial assessment of the feasibility of such an approach, primarily in determining what factors affect solubilization capacity and release profiles and to determine the sensitivity and robustness of the method to temperature fluctuations. Consideration is given to strategies forimplementation of this concept in large-scale chemical processes.Tunable separation media could find major implementation in tackling global problems associated with greenhouse gas mitigation and in performing sensitive chemical separations in the fine-chemical and pharmaceutical areas. The ability to vary electric and magnetic fields rapidly anddynamically could provide additional process flexibility beyond the usual temperature and pressure changes used to drive many gas separation processes, and a greater degree of control over process operations is anticipated. A second area of potential applications is in the control of separations inmicrochemical devices, where the sub-millimeter dimensions are such that high electric fields and sensitive temperature control can be readily attained.

建议类型：CTS-0080915建议类型：调查者发起-SGER主要调查者：T.艾伦·哈顿研究所：麻省理工学院SGER：液晶作为刺激-响应介质用于化学分离的动态调解本项目探索了使用液晶作为吸附剂进行化学分离的动态调解的新概念。对于这些材料，外部刺激的微小变化可以引起流体或界面结构的主要变化，从而显着改变分离介质对目标溶质的能力。具体地说，利用变化的电场或磁场对近晶/向列相/各向同性过渡区附近的热致液晶的影响来控制气体分离的能力和选择性。这项工作的目的是对这种方法的可行性进行初步评估，主要是确定影响增溶能力和释放曲线的因素，并确定该方法对温度波动的敏感性和稳健性。考虑了在大规模化学过程中实施这一概念的战略。可调分离介质可以在解决与温室气体缓解相关的全球问题以及在精细化工和制药领域执行敏感的化学分离方面找到主要实施。快速和动态改变电场和磁场的能力可以提供额外的过程灵活性，而不是通常用于驱动许多气体分离过程的温度和压力变化，并有望对过程操作进行更大程度的控制。第二个潜在的应用领域是控制微型化学设备中的分离，其中亚毫米尺寸使得很容易获得高电场和灵敏的温度控制。