Abstract
High-ammonia latex concentrate prepared from doubly-centrifuged fieldHevea latex was exhaustively dialysed to remove any residual water-soluble non-rubber constituents. The electrophoretic mobilities of the dialysed latex in the presence of various metallic cations were investigated as a function of electrolyte concentration. The mobility decreased with increasing concentration of the cations Na+, Ba2+, Mg2+ and Ca2+ in a manner consistent with the effect of simple electrolyte on compression of the electric double layer. Anomalous behaviour was noted for the divalent ion copper, in that it reversed the charge of the latex particles at a concentration even lower than that of uranyl ions. Multivalent cations (lanthanum, cerium and thorium) had a profound influence on the latex particles where very low charge reversal concentrations were observed. It is believed that strong adsorption of hydrolysed species from the metallic ions was responsible for reversing the charge of the originally negative latex particles. These experiments indicated that the efficiency with which the cations reversed the charge of the latex particle surface was in the order: lanthanum > cerium > copper > thorium > uranyl > calcium > magnesium > barium > sodium. The number of cation binding sites on the latex particle surface and the chemical free energies of cation adsorption were calculated. It was found that the interaction of the latex particle with the hydrolysable metallic cations was much more stronger than that with the simple divalent cations and that this intercation was comparable to that of biological surfaces.
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Matijević E, Abramson MB, Schulz KF, Kerker M (1960) J Phys Chem 64:1157
Matijević E, Mathai KG, Ottewill RH, Kerker M (1961) J Phys Chem 65:826
Matijević E, Conch JP, Kerker M (1962) J Phys Chem 66:111
Abramson MB, Jaycock MJ, Ottewill RH (1964) J Chem Soc 5034
Abramson MB, Jaycock MJ, Ottewill RH (1964) J Chem Soc 5041
Matijević E, Kratohvil S, Stryker LJ (1967) Disc Farday Soc 42:187
Bleier A, Matijević E, McGuire J, Wear JO (1972) J Coll Interf Sci 38:647
Matijević E, Force CG (1972) Kolloid ZZ Polym 225:33
Ottewill RH, Shaw JN (1968) J Coll Interf Sci 26:110
Ottewill RH, Rance DG (1979) Croat Chem Acta 52:1
Kemp AR, Straitiff WG (1940) J Phys Chem 44:788
Belmas R (1952) Rubber Chem Tech 25:132
Archer BL, Barnard D, Cockbain EG, Dickenson PB, McMulfflen AI (1963) In: Bateman L (ed) The Chemistry and Physics of Rubber-like Substances, Applied Science, London, p 41
Ho CC, Ng WL (1979) Coll & Polym Sci 257:406
Sylva RN, Davidson MR (1979) J Chem Soc Dalton Trans 232
Sylva RN, Davidson MR (1979) J Chem Soc Dalton Trans 465
Brown PL, Ellis J, Sylva RN (1983) J Chem Soc Dalton Trans 31
Matijević E (1973) J Coll Interf Sci 43:217
Bungenberg de Jong HG (1949) In: Kruyt HR (ed) Colloid Sciences, Elsevier, Amsterdam 2: 259
Mattson S, Pugh AJ (1934) Soil Sci 38:299
Ohtaki H, Kawai T (1972) Bull Chem Soc Japan 45:1735
Ottewill RH, Rastogi MC, Watanabe A (1960) Trans Faraday Soc 56:854
Chen SF (1974) Ph D thesis, Bristol University
Kayes JB (1976) J Coll Interf Sci 56:426
Wiersema PH, Loeb AL, Overbeek JThG (1966) J Coll Interf Sci 22:78
Klotz IM (1953) In: Neurath H, Bailey K (eds) The Proteins, Academic Press, New York, 1B:727
Wilkins DJ, Ottewill RH (1962) J Theoret Biol 2:165
Omenyi SN, Snyder RS, van Oss CJ (1985) J Dispers Sci Tech 6:391
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Ho, C.C. The effect of metallic cations on the electrophoretic properties of a pretreatedHevea latex. Colloid & Polymer Sci 266, 70–76 (1988). https://doi.org/10.1007/BF01451534
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DOI: https://doi.org/10.1007/BF01451534