聚丙烯酸铵在纳米氮化钛上的定量吸附研究

Quantitative Adsorption of PAA-NH_4 on Nanosized Titanium Nitride

研究了聚丙烯酸铵在纳米氮化钛粉体上的定量吸附及其影响因素．实验结果表明：纳米氮化钛的等电点在ｐＨ＝３．８左右，加入分散剂ＰＡＡ－ＮＨ４后，等电点移至ｐＨ＝２附近，ＰＡＡ－ＸＨ４在纳米氮化钛上的吸附量随吸附时间的增加而增加；同时溶液的酸碱性也影响吸附量，扫描俄歇分析结果表明：ＰＡＡ－ＮＨ４吸附在纳米氮化钛颗粒表面上．

The role of ammonium salt of polyacrylic acid (NH4-PAA) in the dispersion of nanosized titanium nitride aqueous suspensions was investigated experimentally. Surface chemistry of the suspension was investigated by scanning auger microscopy (SAM). Zeta potential studies show that the isoelectric point of nanosized TiN powders is at pH=3.8 and NH4-PAA addition results in the shift of isoelectric point from pH=3.8 to pH=2. The adsorption of PAA-NH4 decreases as pH values increase, because PAA-NH4 is more negatively dissociated.