催化作用
材料科学
化学工程
分析化学(期刊)
色谱法
作者
Jean Boris Stelzer,Rolf Nitzsche,Jürgen Caro
标识
DOI:10.1002/ceat.200402123
摘要
Oxide surfaces are covered with hydroxyl groups. In contact with water, positive or negative surface charges can be developed. The surface charge of oxide particles can be fine-tuned by changing the calcination temperature of the oxides before dispersion in water or by variation of the suspension pH. Strong negative or positive surface charges stabilize a suspension and avoid particle aggregation. Nano-structured catalysts suspended in water show surface charges different from those of compact TiO2. For spray drying, the cationic or anionic additives used have to be strongly attached via electrostatic forces to the surface of the suspended oxide particles. When noble metal complexes have to be brought to the support surface, the positively or negatively charged complexes must have an opposite charge relative to the surface charge. Zeta potential measurements can solve these problems.
科研通智能强力驱动
Strongly Powered by AbleSci AI