Nuclear magnetic and dielectric spectroscopy of amorphous ice

非晶冰的核磁和介电谱

• 批准号: 413265854
• 负责人: Professor Dr. Roland Böhmer
• 金额: --
• 依托单位: Lehrstuhl für Experimentelle Physik III
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/413265854?language=en
• 关键词: Nuclear; magnetic; dielectric; spectroscopy; amorphous

On the surface of interstellar dust, water can condense as non-crystalline, so called amorphous or glassy ice. This form of ice – i.e., the non-crystalline one – appears to be the most abundant in outer space. Furthermore, in addition to the large number of crystalline ice phases, several glassy states exist that can differ in density by up to one third. Upon heating, low-density and high-density amorphous ices, as prepared in the laboratory, transform to controversially discussed states of matter near glass transition temperatures of –135 °C or lower. Via the study of pure, doped, gas-filled, as well as isotope-labeled modifications of various non-crystalline states of ice, it is the goal of this project to explore the extent to which rotational as well as translational degrees of freedom contribute to these glass transitions. To this end frequency-domain and in particular time-domain dielectric measurements will be employed as well as oxygen-17 magnetic resonance spectroscopy, thus methods that provide complementary handles on molecular motions in ultracold water.

在星际尘埃的表面，水可以凝结成非结晶冰，即所谓的无定形或玻璃状冰，这种形式的冰——即非结晶冰——似乎是外太空中最丰富的。由于存在大量的结晶冰相，因此存在几种密度相差高达三分之一的玻璃态。加热后，会产生低密度和高密度的无定形冰。通过研究冰的纯态、掺杂态、充气态以及同位素标记的各种非晶态的修饰，可以将其转变为接近 –135 °C 或更低的玻璃化转变温度的有争议的物质态。该项目的目标是探索旋转和平移自由度对这些玻璃化转变的影响程度，为此将采用频域、特别是时域介电测量。氧 17 磁共振波谱，从而为超冷水中分子运动提供补充处理的方法。

项目成果

Oxygen NMR of high-density and low-density amorphous ice.

高密度和低密度非晶冰的氧核磁共振

• DOI: 10.1063/5.0080333
• 发表时间: 2022
• 期刊: The Journal of chemical physics
• 作者: Lars Hoffmann; Joachim Beerwerth; Mischa Adjei;ete; Christina Maria Tonauer; Thomas Loerting; Rol;Böhmer
• 通讯作者: Böhmer

Advances in the study of supercooled water

过冷水研究进展

• DOI: 10.1140/epje/s10189-021-00139-1
• 发表时间: 2021-11-01
• 期刊: The European Physical Journal E
• 作者: P. Gallo;J. Bachler;L. Bove;R. Böhmer;G. Camisasca;L. E. Coronas;H. Corti;Ingrid de Almeida Ribeiro;M. de Koning;G. Franzese;V. Fuentes;ete;ete;C. Gainaru;T. Loerting;J. M. M. De Oca;P. H. Poole;M. Rovere;F. Sciortino;C. M. Tonauer;G. Appignanesi
• 通讯作者: G. Appignanesi

Amorphous and crystalline ices studied by dielectric spectroscopy.

通过介电谱研究非晶冰和晶冰

• DOI: 10.1063/1.5100785
• 发表时间: 2019
• 期刊: The Journal of chemical physics
• 作者: Lucie J. Plaga; Agnes Raidt; Violeta Fuentes L;ete; Katrin Amann;Böhmer
• 通讯作者: Böhmer

Nature of Water’s Second Glass Transition Elucidated by Doping and Isotope Substitution Experiments

通过掺杂和同位素替代实验阐明水第二次玻璃化转变的性质

• DOI: 10.1103/physrevx.9.011015
• 发表时间: 2019
• 期刊: Physical Review X
• 影响因子: 12.5
• 作者: Violeta Fuentes;ete; Lucie J. Plaga; Markus Keppler; Rol;Böhmer; Thomas Loerting
• 通讯作者: Thomas Loerting