相关实验视频
Updated: May 19, 2026

09:45
Fluorescence Lifetime Imaging of Molecular Rotors in Living Cells
Published on: February 9, 2012
25.3K
通过使用光粘度敏感探头在多孔网络中可视化Sol-Gel过渡
Romane Le Dizès Castell1, Elham Mirzahossein1, Marion Grzelka2
1Institute of Physics, University of Amsterdam, Amsterdam 1098XH, The Netherlands.
The journal of physical chemistry letters
|January 11, 2024
概括
这项研究可视化了在多孔材料中sol-gel过渡期间的微观粘度变化. 它揭示了溶剂蒸发如何驱动表面附近的凝,影响多孔工艺品的恢复.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 物理化学 物理化学
背景情况:
- 溶-凝过渡将悬浮转化为凝,这对于加强多孔材料至关重要.
- 孔隙网络几何学对凝动态的影响尚不清楚.
研究的目的:
- 为了可视化微观的粘度变化在溶液中的sol-gel过渡期间,在多孔介质中的甲基三氧西兰溶液.
- 为了阐明孔径几何和溶剂蒸发对凝动态的影响.
主要方法:
- 使用光粘度敏感分子旋转器进行微观观测.
- 使用共聚焦显微镜可视化模型多孔结构内的凝.
- 在受控蒸发条件下研究了甲基三氧西兰溶液.
主要成果:
- 观察到由于溶剂蒸发而在自由表面附近形成粘度梯度的发展.
- 证明这种梯度在接近表面的毛孔中触发了sol-gel过渡.
- 显示同质介质形成表面"皮肤",减少蒸发,而异质介质表现出凝密度梯度.
结论:
- 孔径几何学显著影响sol-gel过渡动态,主要是由表面蒸发驱动的.
- 凝的形成始于表面附近,然后向内发展,孔径大小和连接性决定了凝密度的分布.
- 这些发现对于优化sol-gel工艺在多孔材料保护和修复中的使用至关重要.
相关概念视频
The Fluid Mosaic Model
The fluid mosaic model was first proposed as a visual representation of research observations. The model comprises the composition and dynamics of membranes and serves as a foundation for future membrane-related studies. The model depicts the structure of the plasma membrane with a variety of components, which include phospholipids, proteins, and carbohydrates. These integral molecules are loosely bound, defining the cell’s border and providing fluidity for optimal function.
Network Covalent Solids
Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...

