Dynamics of Nanoparticle-Assisted Melting and Recrystallization of Water Ice

纳米颗粒辅助水冰熔化和重结晶的动力学

• 批准号: 1808027
• 负责人: Bogdan Dragnea
• 金额: $ 45.04万
• 依托单位: Indiana University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2018
• 资助国家: 美国
• 起止时间: 2018-08-01 至 2022-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1808027&HistoricalAwards=false
• 关键词: Dynamics; Nanoparticle; Assisted; Melting; Recrystallization

Ice melts when you raise the temperature to 0C, or 32F. Melting seems like a simple process, but at the molecular level it is much more complicated. The melting process starts at the surface. The reason is that a water molecule sitting at the surface, or at the interface with another material, is surrounded by fewer neighboring water molecules than one located deeper into the solid. Half as many, in fact. With fewer neighbors, water molecules move more freely. The result is the formation of a pre-melted liquid layer at the interface, even at temperatures colder than the melting temperature. With support from the Macromolecular, Supramolecular and Nanochemistry Program in the Division of Chemistry, Professors Dragnea and Ye at Indiana University are using sophisticated microscopy methods to study the formation of the pre-melted liquid layer around individual gold nanoparticles embedded by ice. Their work could have broad implications for understanding ice melting and recrystallization in environmental and geophysical contexts, such as the melting of snow fields and the thawing of frozen soils, and insights gained could help advance the development of new adhesives and lubricants. The project provides training opportunities for graduate and undergraduate students in the development of complex experimental methods. In addition, an entrepreneurial collaboration with the Indiana University School of Business is introducing future scientists and future business professionals to the process of translating inventions into commercialized products.Working alongside their students, Professors Dragnea and Ye use laser light to excite individual gold nanoparticles. The nanoparticles are grown by the Ye group with precise sizes and surrounded by an organic layer and then encapsulated in ice. The formation of pre-melted liquid layer is observed by the Dragnea group using optical and electron microscopies. Photothermal microscopy provides insight into melting and recrystallization of the ice near the nanoparticle surface, while interfacial morphology is observed by graphene liquid cell transmission electron microscopy. The temperature at which the pre-melted layer forms depends on the chemical interaction between water molecules and the nanoparticle surface, as well as the particle size and curvature. By studying single nanoparticles, the research team can circumvent problems arising from the study of large collections of particles, where particles of different sizes exhibit different pre-melting behaviors. Experimental results are complemented by numerical simulations to determine kinetic parameters and physical properties of the interfacial layer.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

当你把温度提高到0摄氏度或32华氏度时，冰就会融化。熔化似乎是一个简单的过程，但在分子水平上要复杂得多。熔化过程从表面开始。其原因是，位于表面或与另一种材料界面的水分子比位于固体深处的水分子被更少的邻近水分子包围。实际上只有一半。邻居越少，水分子运动就越自由。结果是在界面处形成预熔化的液体层，即使温度低于熔化温度。在化学学部大分子、超分子和纳米化学项目的支持下，印第安纳大学的Dragnea教授和Ye教授正在使用复杂的显微镜方法研究被冰嵌入的单个金纳米颗粒周围预融化液体层的形成。他们的工作可能对了解环境和地球物理背景下的冰融化和再结晶具有广泛的意义，例如雪原融化和冻土融化，并且获得的见解可以帮助推进新型粘合剂和润滑剂的开发。该项目为研究生和本科生提供了开发复杂实验方法的培训机会。此外，与印第安纳大学商学院（Indiana University School of Business）的一项创业合作正在向未来的科学家和未来的商业专业人士介绍将发明转化为商业化产品的过程。德拉尼亚教授和叶教授与他们的学生一起使用激光激发单个金纳米粒子。这些纳米颗粒由Ye组生长，具有精确的尺寸，并被有机层包围，然后被封装在冰中。Dragnea小组用光学和电子显微镜观察了预熔液层的形成。光热显微镜可以深入了解纳米颗粒表面附近冰的融化和再结晶，而石墨烯液体电池透射电子显微镜可以观察到界面形态。预熔层形成的温度取决于水分子和纳米颗粒表面之间的化学相互作用，以及颗粒的大小和曲率。通过研究单个纳米颗粒，研究小组可以避免研究大型颗粒集合时出现的问题，其中不同尺寸的颗粒表现出不同的预熔行为。实验结果与数值模拟相结合，确定了界面层的动力学参数和物理性质。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。

项目成果

Radiation Brightening from Virus-like Particles

病毒样颗粒的辐射增亮

• DOI: 10.1021/acsnano.9b04786
• 发表时间: 2019
• 期刊: ACS Nano
• 影响因子: 17.1
• 作者: Tsvetkova, Irina B.;Anil Sushma, Arathi;Wang, Joseph Che-Yen;Schaich, William L.;Dragnea, Bogdan
• 通讯作者: Dragnea, Bogdan

Watching a virus grow

观察病毒的生长

• DOI: 10.1073/pnas.1915986116
• 发表时间: 2019
• 期刊: Proceedings of the National Academy of Sciences
• 作者: Dragnea, Bogdan

Photothermal microspectroscopy with Bessel–Gauss beams and reflective objectives

使用贝塞尔高斯光束和反射物镜进行光热显微光谱分析

• DOI: 10.1364/ao.58.007352
• 发表时间: 2019
• 期刊: Applied Optics
• 影响因子: 1.9
• 作者: Zahedian, Maryam;Koh, Eun Sohl;Dragnea, Bogdan
• 通讯作者: Dragnea, Bogdan

Colloidal Synthesis of Nanohelices via Bilayer Lattice Misfit

• DOI: 10.1021/jacs.0c05175
• 发表时间: 2020-07-22
• 期刊: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
• 影响因子: 15
• 作者: Liu, Yang;Li, Yuda;Ye, Xingchen
• 通讯作者: Ye, Xingchen

Studies of Nanoparticle-Assisted Photoannealing of Polydimethylsiloxane by Time-harmonic Photothermal Microscopy

时谐光热显微镜研究聚二甲基硅氧烷纳米颗粒辅助光退火

• DOI: 10.1021/acsphotonics.0c00968
• 发表时间: 2020
• 期刊: ACS Photonics
• 影响因子: 7
• 作者: Zahedian, Maryam;Lee, Zachary;Koh, Eun Sohl;Dragnea, Bogdan
• 通讯作者: Dragnea, Bogdan