MRI: Development of an instrument for quantitative characterization of size distribution of aquatic colloids

MRI：开发定量表征水生胶体尺寸分布的仪器

• 批准号: 1126870
• 负责人: Dariusz Stramski
• 金额: $ 47.25万
• 依托单位: University of California-San Diego Scripps Inst of Oceanography
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2011
• 资助国家: 美国
• 起止时间: 2011-09-15 至 2016-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1126870&HistoricalAwards=false
• 关键词: MRI; Development; instrument; quantitative; characterization

Colloids are the most abundant particles in the ocean and other aquatic environments, and play a crucial role in the structure and functioning of these ecosystems. The PI's request funding to design and fabricate a new instrument, an Aquatic Colloidal Analyzer (ACAN), for quantitative determinations of concentration and size distribution of heterogeneous colloidal assemblages (including nanoparticles) present in aqueous suspensions. No instrumentation is presently available which provides accurate information about size distribution of polydisperse systems of aquatic colloids over a broad size range from about 10 nm to 1 µm. The ACAN will utilize a Nanoparticle Tracking Analysis (NTA) method, which is based on physical principles of Brownian motion and light scattering by colloids. The ACAN measurements on unperturbed samples will provide a capability for acquiring an unprecedented wealth of scientifically new and valuable information on polydisperse assemblages of naturally occurring aquatic colloids, which cannot be obtained using present techniques. The data from these measurements will be fundamental in extending the understanding of the biogeochemistry of the ocean, the carbon cycle, satellite remote sensing of the oceans for biogeochemical and climate studies, the roles of microbes in ocean ecosystems, and atmospheric colloidal particles and their deposition into the ocean (via rainwater analysis).Broader Impacts: The proposed instrument has the potential to impact a broad range of environmental studies related to particle dynamics, such as biology, chemistry, optics, physics and climate science. These measurement are critical for many fields in the aquatic sciences The project would interface with the education and outreach projects with the UCSD Preuss School and the Scripps Birch Aquarium designed for K-12 students, college students, and general public.

胶体是海洋和其他水生环境中最丰富的颗粒，在这些生态系统的结构和功能中起着至关重要的作用。PI的要求资金设计和制造一种新的仪器，水生胶体分析仪（ACAN），用于定量测定水悬浮液中存在的异质胶体组合（包括纳米颗粒）的浓度和尺寸分布。目前还没有仪器能够提供关于水胶体多分散体系在约10 nm至1 µm的宽尺寸范围内的尺寸分布的准确信息。禁毒常务委员会将采用纳米粒子追踪分析方法，该方法以布朗运动和胶体光散射的物理原理为基础。对未受干扰样品的禁毒常务委员会的测量将提供一种能力，以获取前所未有的丰富的科学新的和有价值的信息的多分散组合的天然存在的水生胶体，这不能获得使用目前的技术。从这些测量中获得的数据对于扩大对海洋地球化学、碳循环、卫星遥感海洋用于地球化学和气候研究、微生物在海洋生态系统中的作用以及大气胶体颗粒及其在海洋中的沉积的理解将是至关重要的（通过雨水分析）。拟议的仪器有可能影响与粒子动力学有关的广泛的环境研究，如生物学，化学，光学，物理学和气候科学。这些测量对水产科学的许多领域都至关重要。该项目将与UCSD Preuss学校和为K-12学生、大学生和公众设计的斯克里普斯桦树水族馆的教育和推广项目对接。