Producing desired ice faces
Producing desired ice faces
复制标题
制作所需的冰面
DOI：
--
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发表时间：
2015
影响因子：
11.1
通讯作者：
Ryan Shultz
中科院分区：
文献类型：
--
作者：
M. Shultz;Alexandra Brumberg;P. Bisson;Ryan Shultz
意义 由于制备纯冰面的挑战，冰的分子级结构（键合模式、键合位点和分子迁移率）很难通过实验进行探测。一种方法是在基底上生长冰。然而，冰是通过氢键结合在一起的。基材会扰乱连接并从根本上改变表面特性。这项工作展示了如何定量指定冰晶格相对于表面的方向。更重要的是，基于最近成功生长的大型单晶，它展示了如何从初始晶体表面取向制备任何所需的面。描述了准备任意面的一般过程。该程序用于从不同的初始方向准备所有三个主要面。制备单晶面的能力已成为开发和测试界面化学模型的核心，多相催化和纳米科学充分证明了这一点。由于冰的两个特性，六角冰 Ih（一种基本的氢键表面）的这种能力受到了阻碍：冰不容易沿着晶格平面分裂，并且在基底上生长的冰的特性可能与纯冰的特性显着不同。这项工作描述了基于实验室的方法，既确定相对于表面的 Ih 晶格取向，又使用该取向制备任何所需的面。这项工作建立在先前成果的基础上，获得了近 100% 的高质量单晶晶锭产率。通过这些方法，研究人员可以为许多研究准备真实的单晶冰表面，包括这种普遍存在的基础固体的吸收测量、表面反应性和催化活性。
Significance The molecular-level structure of ice––bonding patterns, binding sites, and molecular mobility––is difficult to probe experimentally due to challenges preparing faces of neat ice. One approach is to grow ice on a substrate. However, ice is held together by hydrogen bonds; a substrate perturbs the connections and radically alters the surface properties. This work shows how to quantitatively specify orientation of the ice lattice with respect to a surface. More importantly, based on recent success growing large single crystals, it shows how to prepare any desired face from the initial crystal surface orientation. A general procedure for preparing any arbitrary face is described. The procedure is used to prepare all three major faces from various initial orientations. The ability to prepare single-crystal faces has become central to developing and testing models for chemistry at interfaces, spectacularly demonstrated by heterogeneous catalysis and nanoscience. This ability has been hampered for hexagonal ice, Ih––a fundamental hydrogen-bonded surface––due to two characteristics of ice: ice does not readily cleave along a crystal lattice plane and properties of ice grown on a substrate can differ significantly from those of neat ice. This work describes laboratory-based methods both to determine the Ih crystal lattice orientation relative to a surface and to use that orientation to prepare any desired face. The work builds on previous results attaining nearly 100% yield of high-quality, single-crystal boules. With these methods, researchers can prepare authentic, single-crystal ice surfaces for numerous studies including uptake measurements, surface reactivity, and catalytic activity of this ubiquitous, fundamental solid.
使用劳厄 X 射线衍射法完全测定冰晶方向
影响因子：
3.4
作者：
Miyamoto;Weikusat;Hondoh
通讯作者：
Hondoh