Abstract
Lamellar crystalline silicas (crystalline silicic acids, chemical composition SiO2·xH2O; examples: H4Si14O30·xH2O, H4Si20O42·xH2O) are distinguished from the amorphous forms by their layered structure and exceptional adsorption properties. One outstanding example is the reaction with anionic surfactants. Several types of crystalline silicas (typical H4Si20O42·xH2O) can intercalate ionic pairs consisting of surfactant anion and gegen ion into the interlayer space. The saturation value of SDS adsorption is 0.475 mmol SDS/g H4Si20O42·3H2O. The acid H4Si14O30·xH2O adsorbs anionic surfactants at the external surfaces only (saturation value 0.04 mmol/g H4Si14O30·0.8 H2O). When anionic surfactants are adsorbed in the interlayer space, the layer separation increases to such an extent that the crystals disarticulate in a fan-like manner or delaminate into thinner packets of layers or smaller aggregates. Washing-out the SDS ionic pairs or drying reconstitutes the parallel layer orientation and leads to re-aggregation of the packets and fragments.
Similar content being viewed by others
References
Bergk KH, Schwieger W, Porsch M (1987) Chem Technik 39:459–508; 508–514
Bergk KH, Kaufmann D, Porsch M, Schwieger W (1987) Seifen-Fette-Öle-Wachse 113:555–561
Berg KH, Schwieger W, Schäfer A (1989) Z Chem 29:151–152
Lagaly G, Beneke K, Weiss A (1975) Am Min 60:642–649; 650–658
Lagaly G (1979) Adv Colloid Interface Sci 11:105–148
Beneke K, Lagaly G (1983) Am Min 68:818–826
Beneke K, Kruse HH, Lagaly G (1984) Z anorg allgem Chem 518:65–76
Beneke K, Lagaly G (1989) Am Min 74:224–229
Schwieger W, Heyer W, Wolf F, Bergk KH (1987) Z anorg allgem Chem 548:204–216
Schwieger W, Heyer W, Bergk KH (1988) Z anorg allgem Chemie 559:191–200
Döring J (1991) Thesis, University Kiel
Kruse HH, Beneke K, Lagaly G (1989) Colloid Polym Sci 267:844–852
Lagaly G, Beneke K (1991) Colloid Polym Sci 269:1198–1211
Lagaly G, Fahn R (1983) In: Ullmann's Encyklopädie der technischen Chemie. Verlag Chemie, Weinheim, 23:311–326
Lagaly G (1992) From clay mineral crystals to clay mineral dispersion. In: Dobias B (ed) Coagulation and flocculation: theory and application. Marcel Dekker, New York, in press
Heller-Kallai L, Huard E, Prost R (1991) Clay Min 26:245–253
Scholzen G, Beneke K, Lagaly G (1991) Z anorg allgem Chem 597:193–209
Dörfler HD, Bergk KH, Müller K, Müller E (1984) Tenside Detergents 21:226–234
Brandt A, Schwieger W, Bergk KH (1987) Revue de Chimie minérale 24:564–571
Raussell-Colom JA, Saez-Aunón J, Pons CH (1989) Clay Min 24:459–478
Alberti G, Casciola M, Costantino U (1985) J Colloid Interface Sci 107:256–263
Lagaly G (1986) Solid State Ionics 22:43–51
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Döring, J., Beneke, K. & Lagaly, G. Adsorption properties of crystalline silicas: (II) Adsorption of anionic surfactants and delamination. Colloid Polym Sci 270, 609–616 (1992). https://doi.org/10.1007/BF00658293
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF00658293