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States of Water01:23

States of Water

Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
Sublimation01:03

Sublimation

Sublimation is the direct transformation of a solid to a gaseous state. For instance, at standard pressure and room temperature, solid carbon dioxide sublimes to gaseous carbon dioxide. The phase diagram depicts the conditions required for sublimation. This process occurs at the solid-gas phase boundary and is not observed above the triple point of the substance. The reverse of sublimation is called deposition, where a gaseous substance condenses directly into a solid. Sublimation and...
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Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity
08:46

Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity

Published on: January 15, 2014

"スピンアイス"が凍る方法

J Snyder1, J S Slusky, R J Cava

  • 1Department of Physics and Materials Research Institute, Pennsylvania State University, University Park, Pennsylvania 16802, USA.

Nature
|September 7, 2001
PubMed
まとめ
この要約は機械生成です。

磁気材料であるDy2Ti2O7の幾何学的な挫折は,新しいスピン凍結移行につながります. この行動は氷を模倣するものです.

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Last Updated: May 12, 2026

Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity
08:46

Determining the Ice-binding Planes of Antifreeze Proteins by Fluorescence-based Ice Plane Affinity

Published on: January 15, 2014

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08:16

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Published on: March 13, 2017

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科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マグネティズム (磁気) とは
  • 熱力学は熱力学である.

背景:

  • 幾何学的挫折は,磁気やタンパク質の折りたたみのようなフィールドに影響を及ぼす競合する相互作用から生じる.
  • 氷の低温熱力学は,陽子の位置の幾何学的挫折によって影響を受け,基底状態のエントロピーにつながります.
  • 磁性物質であるDy2Ti2O7は,角を共有する四面体格子に幾何学的挫折を示し",スピンアイス"状態を形成します.

研究 の 目的:

  • Dy2Ti2O7.7における協力的なスピン凍結移行を特定し,特徴づけること.
  • スピン氷の基本状態の形成の基礎となるダイナミクスとメカニズムを理解する.
  • Dy2Ti2O7におけるスピン凍結と,氷の中の陽子の凍結を並列に描く.

主な方法:

  • Dy2Ti2O7磁気材料の実験調査.
  • スピンのダイナミクスとリラックス時間の分析.
  • 低温での熱力学的測定. 低温での熱力学的測定.

主要な成果:

  • Dy2Ti2O7.7で,スピン氷の基本状態につながる協力的なスピン凍結の移行が特定されました.
  • 移行は,非常に狭い範囲のリラックス時間によって特徴付けられます.
  • 観測されたダイナミクスは,氷の中での陽子の凍結に類似しています.

結論:

  • Dy2Ti2O7は,幾何学的な挫折によって引き起こされる新しい形のスピン凍結を示しています.
  • Dy2Ti2O7のスピン氷状態は,挫折感誘発現象を研究するためのモデルシステムを提供します.
  • この研究は,低障害のシステムにおけるガラスのような行動と挫折効果の洞察を提供します.