在封闭水中,高密度液体和低密度无形相之间的第一阶段过渡
1Department of Chemistry, Fukuoka University of Education, Japan. kenkoga@fukuoka-edu.ac.jp
Nature
|December 16, 2000
概括
在疏水孔中被封闭的水在冷却后过渡到双层无形阶段. 这种新的液体-to-bilayer无形过渡发生在散装水结温度以上.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 计算物理 计算物理
背景情况:
- 超冷水和无形冰表现出复杂的转移稳定阶段行为.
- 之前的研究发现了高/低密度无形固体和液体之间的过渡,以及受限水中的脆弱到强的液体过渡.
研究的目的:
- 为了研究水疏裂孔内的水中的新型相位过渡.
- 为了识别和描述一个液体-to-bilayer无形过渡在散装水的结点以上.
主要方法:
- 用分子动力学模拟来研究水的行为.
- 专注于被限制在疏水裂毛孔中的水,其宽度为亚纳米米.
主要成果:
- 在封闭的水中观察到一级液体-to-bilayer无形过渡.
- 这种过渡发生在大量水的结温度以上,特别是在宽度小于1纳米的疏水裂孔中.
- 冷却将受限水从一个不完美的结网络转化为双层无形相,具有完美的多边形结网络,但没有远程顺序.
结论:
- 对于封闭的水,存在一种新型的相位过渡,即液态到气态无形.
- 这种过渡取决于孔隙疏水性和封闭宽度.
- 观察到的过渡与其他四面体协调物质 (如,碳和) 的相位过渡有相似之处.
相关概念视频
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...
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...
Osmosis
Approximately 60% to 95% of the weight of living organisms is attributed to water. Therefore, maintaining appropriate water balance within cells is of paramount importance. Osmosis is the movement of water across a semipermeable membrane, such as a cell’s plasma membrane. In living organisms, water plays a crucial role as a solvent—a molecule that dissolves other molecules.Diffusion Versus OsmosisBoth diffusion and osmosis are types of passive transport—cellular transport that does not require...
Classifying Matter by State
Chemistry is the study of matter and the changes it undergoes. Matter is anything that has mass and occupies space. Matter is all around us; the air, water, soil, mountains, even our bodies are all examples of matter. Matter is divided into three states — solid, liquid, and gas — that are commonly found on earth. The fourth state of matter, plasma, occurs naturally in the interiors of stars.
Intermolecular Forces
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Intermolecular Forces
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Osmosis
Osmosis is the movement of free water molecules through a semipermeable membrane. The water's concentration gradient across the membrane is inversely proportional to the solutes' concentration. Whereas diffusion transports material across membranes and within cells, osmosis transports only water across a membrane, and the membrane limits the diffusion of solutes in the water. Osmosis is a special case of diffusion.
Water, like other substances, moves from a high concentration of free water...
Water, like other substances, moves from a high concentration of free water...


