氷の盲目構造の予測 XIV
Gareth A Tribello1, Ben Slater, Christoph G Salzmann
1Davy Faraday Research Laboratory, The Royal Institution of Great Britain, 21 Albemarle Street, London W1S 4BS, U.K.
Journal of the American Chemical Society
|September 28, 2006
まとめ
氷XIIのいくつかの水素配列氷相には,明確な水素ネットワークがあります. これらのユニークな氷の構造は,特定の運動的に制御された条件下で形成され,水氷の多形性に関する新しい洞察を明らかにします.
科学分野:
- 固体化学 固体化学
- マテリアルサイエンス 材料科学
- クリスタログラフィーです.
背景:
- アイスXIIは,水氷の高圧ポリモルフである.
- 氷相における水素の順序を理解することは,その性質を説明するために極めて重要です.
- 以前の研究では,様々な氷のXII構造が特定されましたが,それらの水素ネットワークについては,さらなる明確化が必要です.
研究 の 目的:
- 水素を調査するために,氷の構造を命令しました XII.
- さまざまな氷のXII段階の間の水素ネットワークのトポロジカルな違いを特徴付けるために.
- これらの異なった氷のXII段階の形成における運動的に制御された条件の役割を調査する.
主な方法:
- 水氷構造の計算モデリング.
- トポロジカル・ディスクリプタを用いた水素結合ネットワークの分析.
- 異なる運動パラメータの下で氷の形成のシミュレーション.
主要な成果:
- 複数の水素でオーダーされた氷のXII段階を特定しました.
- これらの相がトポロジ的に異なる水素ネットワークを有することを示した.
- これらの特定の氷のXII構造の形成には,運動的に制御された条件が不可欠であることを確認しました.
結論:
- 独特の水素ネットワークを備えたいくつかの水素でオーダーされた氷のXII段階の存在は,証拠によって支持されています.
- 運動的に制御された形成経路は,氷XIIのトポロジ的に異なる水素配列につながります.
- この研究は,水氷の多形態化と水素の順序を決定する要因の理解を前進させる.
関連する概念動画
Determination of Crystal Structures
In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...
Blind Procedures
Ideally, the people who observe and record the children’s behavior are unaware of who was assigned to the experimental or control group, in order to control for experimenter bias. Experimenter bias refers to the possibility that a researcher’s expectations might skew the results of the study. Remember, conducting an experiment requires a lot of planning, and the people involved in the research project have a vested interest in supporting their hypotheses. If the observers knew which child was...
Predicting Molecular Geometry
VSEPR Theory for Determination of Electron Pair Geometries
Structures of Solids
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
X-ray Crystallography
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...


