Materials Research Group, Department of Chemistry, St. Joseph's College, 36 Lalbagh Road, Bangalore 560 027, India.
J Colloid Interface Sci. 2010 May 1;345(1):109-15. doi: 10.1016/j.jcis.2010.01.047. Epub 2010 Feb 1.
p-Aminobenzoate ion intercalated alpha-hydroxides of nickel/cobalt were synthesized by precipitation using ammonia (pH= approximately 12). Aqueous colloidal suspension of alpha-hydroxide of nickel/cobalt was obtained on washing the precipitate as the pH was reduced to approximately 7. The development of partial positive charge on the amine end of the intercalated anion causes repulsion between the layers leading to exfoliation and colloidal suspension of monolayers in water. While the layers could be restacked from the colloidal suspension in the presence of other anions in the case of alpha-cobalt hydroxide, the exfoliation could not be reversed easily in the case of the nickel analog.
对苯二甲酸根离子插层的镍/钴α-氢氧化物是通过使用氨水（pH 值约为 12）沉淀合成的。将沉淀物洗涤至 pH 值约为 7，可得到镍/钴α-氢氧化物的水溶胶。插层阴离子的氨基端部分带正电荷，导致层间斥力增加，从而使层状化合物剥落并在水中形成单层胶体悬浮液。虽然在存在其他阴离子的情况下，α-氢氧化钴的胶体悬浮液中的层可以重新堆积，但镍的类似物的剥落则不容易逆转。
