What is surface hydroxyl engineering?
Surface hydroxyl engineering refers to the targeted regulation of the number, distribution, and chemical activity of hydroxyl (- OH) groups on the surface of materials through physical, chemical, or plasmonic means, in order to achieve precise adjustment of surface properties. Hydroxyl groups are the most common polar functional groups that can form hydrogen bonds, coordination bonds, or covalent bonds with water, metal ions, polymer chains, or biomolecules, significantly altering the hydrophilicity, surface energy, adsorption/catalytic activity, and biocompatibility of materials.
How to characterize surface hydroxyl engineering
For example:Zhuravlev model (silicon-based material):
Among them, khyd is the hydrolysis rate constant, kcond is the dehydration condensation rate constant, and is the treatment time. This model can quantitatively describe the evolution trend of hydroxyl groups with heat treatment or wet heat treatment.
Surface hydroxyl density:
The total hydroxyl number measured by X-PS, FT-IR or chemical titration is divided by the specific surface area (BET). This indicator is commonly used to compare the effects of different modification processes.
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