Stability of allophane, allophanic clay, and allophane-halloysite floc in aqueous solutions of an anionic exocellular heteropolysaccharide (Gum Xanthan) from Xanthomonas campestris
Stability of allophane, allophanic clay, and allophane-halloysite floc in aqueous solutions of an anionic exocellular heteropolysaccharide (Gum Xanthan) from Xanthomonas campestris
复制标题
水铝英石、水铝英石粘土和水铝英石-埃洛石絮凝物在来自野油菜黄单胞菌的阴离子胞外杂多糖（黄原胶）水溶液中的稳定性
DOI：
10.1080/00380768.1996.10416329
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发表时间：
1996
影响因子：
2
通讯作者：
Y. Horikawa
中科院分区：
文献类型：
--
作者：
M. He;Y. Horikawa
Abstract Stability of allophane with positive and/or negative charges in the presence of gum xanthan (GX) was mainly investigated at three pH levels. At pH 4.5, allophane showed polymeric iocculation (PFL) at low GX concentrations, and polymeric stabilization (PST) at medium GX concentrations. Flocculated allophane (i.e.p.) at pH 6.5 showed polymeric weak-stabilization (PWST) at extremely low GX concentrations, besides PFL and PST described above. At pH 8.5, allophane did not exhibit any change in stability with GX addition. The PFL and PWST can be regarded as charge neutralization between allophane and GX. Allophanic clay with i.e.p. at pH 10 exhibited both PFL and PST but no PWST, even at pH 8.5. The PWST can be explained by the disintegration of the floc when interparticle attraction was weakened by the adsorption of GX. The lower PWST and PST of allophane-halloysite mutual floc strongly suggested the presence of a more stable arrangement among these dissimilar particles. Stability of crystalline clays...
