The surface of diamond is generally covered with a layer of hydrophobic C-H bonding, but after the diamond powder has been cleaned and decontaminated with strong acid and alkali for many times, the surface functional groups will be removed during the cleaning process. Diamond is a very stable material and does not react with other materials, so it is necessary to modify the surface electrical properties of diamond or attach the surface functional groups in additives or other applications, so that it can be used.
Introduction to Diamond Dispersion and Surface Modification Methods
- To enable diamonds to bond with molecules containing amine groups (-NH2), carboxyl groups (-COOH) can be introduced on the diamond surface. This is typically achieved by washing the nanodiamond surface with strong acids or by heating the nanodiamonds in acid solutions. This method also increases the presence of oxygen-containing functional groups (e.g., C=O, C-O-C), enhancing affinity with water.
- If the goal is to disperse diamonds in oil-based products, the diamonds can be placed in a furnace while hydrogen is introduced (※ Be sure to ignite the exhaust to prevent the risk of explosion). Heating to 500~700°C will create hydrogen bonds on the surface, increasing compatibility with oil-based products.
- To disperse diamonds in water-based or oil-based liquids, hexametaphosphate or commonly used polymeric surfactants (both cationic and anionic types), such as ammonium oleate soap, can be used. These agents help adjust the electrical charge and pH value of the solution, facilitating dispersion.
With the advancement of science and technology, more and more new methods are emerging. How to flexibly make good use of past knowledge and materials and combine them with new technologies and new knowledge has become increasingly important. We emphasize that expensive is not necessarily the best, but the most appropriate solution is the most important.
If you wish to use Honway’s images and text, please be sure to cite the source. Respecting creation also means respecting the creators.
