摘要
研究了玻璃颗粒在乙醇溶液中对Ca2+的选择吸附,反转了玻璃颗粒在乙醇中的荷电性质,使玻璃颗粒能够在乙醇中与羟基磷灰石发生共沉积。讨论了不同离子浓度下电泳沉积的沉积量与沉积电流的变化情况,并以此对Ca2+在电泳沉积中的作用进行了分析。实验结果证实:悬浮液中Ca2+或吸附到玻璃颗粒上,改变其荷电性质;或留在溶液中,作为电泳沉积过程中电流的主要承载者。离子浓度对电泳沉积的效果有重要的影响,离子浓度太低或太高都易使涂层出现缺陷。分析了不同沉积条件下电泳沉积所得涂层的各种缺陷及其成因。
Charge of glass particles in ethanol was changed from negative to positive by introducing calcium ions into suspension,which resulted in co-deposition of the glass particles and hydroxyapatite particles in ethanol subsequently. Changes of deposition yield and depositing current in the suspension with different concentration of calcium ions were studied. The role of Ca^(2+) in electrophoretic deposition was analyzed. Results show that Ca^(2+) in the suspension is either absorbed onto the glass particles to change the charge properties, or retained in the suspension as primary current carrier in the electrophoretic deposition process. The concentration of Ca^(2+) has much influence on electrophoretic deposition and defects appear in the coating prepared in the suspension with too high or too low concentration of Ca^(2+). Defects of the coating are also described.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2004年第7期832-836,共5页
Journal of The Chinese Ceramic Society
基金
湖北省重点科技攻关计划项目(2001AA306B03)。
关键词
电泳沉积
钙离子
玻璃颗粒
吸附
沉积量
electrophoretic deposition
calcium ions
glass particles
adsorption
deposition yield
