Burg Ariela, Yadav Krishna K, Meyerstein Dan, Kornweitz Haya, Shamir Dror, Albo Yael
Chemical Engineering Department, Sami Shamoon College of Engineering, Beer-Sheva 84100, Israel.
Chemical Sciences Department and The Radical Research Center, Ariel University, Ariel 40700, Israel.
Gels. 2024 Jul 2;10(7):441. doi: 10.3390/gels10070441.
The sol-gel process enables the preparation of silica-based matrices with tailored composition and properties that can be used in a variety of applications, including catalysis, controlled release, sensors, separation, etc. Commonly, it is assumed that silica matrices prepared via the sol-gel synthesis route are "inert" and, therefore, do not affect the properties of the substrate or the catalyst. This short review points out that porous silica affects the properties of adsorbed/entrapped species and, in some cases, takes an active part in the reactions. The charged matrix affects the diffusion of ions, thus affecting catalytic and adsorption processes. Furthermore, recent results point out that ≡Si-O. radicals are long-lived and participate in redox processes. Thus, clearly, porous silica is not an inert matrix as commonly considered.
溶胶-凝胶法能够制备出具有特定组成和性质的二氧化硅基基质，这些基质可用于多种应用，包括催化、控释、传感、分离等。通常认为，通过溶胶-凝胶合成路线制备的二氧化硅基质是“惰性的”，因此不会影响底物或催化剂的性质。这篇简短的综述指出，多孔二氧化硅会影响吸附/截留物质的性质，在某些情况下，还会积极参与反应。带电基质会影响离子的扩散，从而影响催化和吸附过程。此外，最近的研究结果指出，≡Si-O·自由基寿命较长，并参与氧化还原过程。因此，显然多孔二氧化硅并非如通常所认为的那样是惰性基质。
