関連する実験動画
Updated: Jul 23, 2026
11:21
Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
Published on: March 30, 2017
AOTの逆ミセルの低温誘発による水分流出の動態
Alana K Simorellis1, Wade D Van Horn, Peter F Flynn
1Department of Chemistry, University of Utah, Salt Lake City, Utah 84112-0850, USA.
Journal of the American Chemical Society
|April 13, 2006
まとめ
NMRを用いた逆ミセルの水の調査は,温度と塩分濃度の影響が水の損失と構造に及ぼすことを明らかにしています. リバースミセルは,超冷却状態でも,閉じ込められた水の研究に有効です.
科学分野:
- 物理化学 物理化学
- 超分子化学 超分子化学
- マテリアルサイエンス 材料科学
背景:
- リバースミセルは,水溶液をカプセル化できる自己組み立てナノ構造体です.
- 閉じ込められた水の振る舞いを理解することは,様々な化学的,生物学的プロセスに不可欠です.
研究 の 目的:
- AOT/ペンタン逆ミセル内の水に対する低温とイオン強さの影響を調査する.
- 異なる条件下でカプセル化された水の構造的および定量的変化を特徴付ける.
主な方法:
- 溶液核磁共振 (NMR) スペクトロスコーピー,特に1D (1) H NMR.
- 温度 (20°Cから-30°C) とNaCl濃度の体系的な変動.
主要な成果:
- 低温での逆ミセルからの水分損失は,イオン強度に依存しています.
- 最終水負荷 (w0) は,水相のイオン強度によっても影響を受けます.
- -20°Cから -30°CのNMR信号は,微細な構造を示し,複数の一時的な水群を示した.
結論:
- リバースミセルは,閉じ込められた水の研究のための貴重なモデルシステムとして機能します.
- このシステムは,制御された条件下で,超冷却状態を含む水の性質の探査を可能にします.
関連する概念動画
00:47Osmosis
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...
02:40Osmosis and Osmotic Pressure of Solutions
A number of natural and synthetic materials exhibit selective permeation, meaning that only molecules or ions of a certain size, shape, polarity, charge, and so forth, are capable of passing through (permeating) the material. Biological cell membranes provide elegant examples of selective permeation in nature, while dialysis tubing used to remove metabolic wastes from blood is a more simplistic technological example. Regardless of how they may be fabricated, these materials are generally...
01:25Aquaporins
Aquaporins or AQPs are a family of integral membrane proteins whose primary function is to transport water, while some called aquaglyceroporins also transport glycerol. In addition, aquaporins have also been suspected to be involved in transporting volatile substances, such as carbon dioxide and ammonia, across membranes. Such AQPs that act as gas channels are often highly expressed in cells involved in the gaseous exchange, such as red blood cells, epithelial cells, and pulmonary capillaries.
01:30Osmosis
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...
01:26Osmotic Pressure
Osmosis is a process where solvent molecules move toward a solution through a semipermeable membrane. As the solution dilutes due to the entry of solvent, it expands. This expansion increases the hydrostatic pressure of the solution. When the hydrostatic pressure equals the osmotic pressure, osmosis stops.Osmotic pressure, denoted by Π, is the minimum pressure needed to prevent the solvent from passing into the solution by osmosis. The van 't Hoff equation calculates the osmotic pressure of an...
01:26Regulation of Water Output
The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...