Abstract
The ordered structures are observed by a metallurgical microscope for heavy gold particles (specific gravity=19.3) in sedimentation equilibrium. The hexagonal order is observed not only in the deionized state but also in the presence of NaCl, and the centre-to-centre distance between particles, 2D exp, decreases with salt concentration. 2D exp decreases with increasing initial concentrations of gold partilces, and the lattice structures are compressed under a gravitational field. The Young's modulus of the lattice is estimated as 1.3 dyn · cm−2. The results confirm that the electrostatic interparticle repulsion and/ or thick electrical double layers around the particles are essential for the ordering of the colloids.
Similar content being viewed by others
References
Luck W, Klier M, Wesslau H (1963) Ber Bunsenges Phys Chem 67:75, 84
Ottewill RH, Shaw JN (1966) Disc Faraday Soc 42:154
Vanderhoff W, van de Hul HJ, Tausk RJM, Overbeek JThG (1970) In: Goldfinger G (ed) Clean Surfaces: Their Preparation and Characterization for Interfacial Studies, Dekker, New York
Hiltner PA, Papir YS, Krieger IM (1971) J Phys Chem 75:12
Kose A, Ozaki M, Takano K, Kobayashi Y, Hachisu S (1973) J Coll Interf Sci 44:330
Williams R, Crandall RS (1974) Phys Lett 48A:225
Clark NA, Hurd AJ, Ackerson BJ (1979) Nature, London A281:6, 57
Goodwin JW, Ottewill RH, Parentich A (1980) J Phys Chem 84:12, 1580
Tomita M, Takano K, van de Ven TGM (1983) J Coll Interf Sci 92:367
Pieranski P (1983) Contemp Phys 24:25
Okubo T (1987) J Chem Phys 86:2394
Okubo T (1987) Coll & Polym Sci, in press
Okamoto S, Hachisu S (1973) J Coll Interf Sci 43:30
Hachisu S, Kose A, Kobayashi Y, Takano K (1976) J Coll Interf Sci 55:499
Ito K, Ise N, Okubo T (1985) J Chem Phys 82:5732
Alexander S, Chaikin PM, Grant P, Morales GJ, Pimcus P, Hone D (1984) J Chem Phys 80:5776
Crandall RS, Williams R (1977) Science 198:293
Landau LD, Lifshitz EM (1959) Theory of Elasticity, Pergamon, New York, Chapter 1
Mitaku S, Otsuki T, Enari K, Kishimoto A, Okano K (1978) Jpn J Appl Phys 17:305
Mitaku S, Otsuki T, Okano K (1978) Jpn J Appl Phys 17:627
Mitaku S, Otsuki T, Okano K (1980) Jpn J Appl Phys 19:439
Otsuki T, Kishimoto A, Mitaku S, Okano K (1981) Jpn J Appl Phys 20:509
Lindsay HM, Chaikin PM (1982) J Chem Phys 76:3774
Joanicot HM, Jorand M, Pieranski P, Rothen F (1984) J Phys, Paris 45:1413
Okubo T (1987) J Coll Interf Sci, in press
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Okubo, T. Microscopic observation of ordered colloids in sedimentation equilibrium and the important role of Debye screening length. 4. Gold particles (specific gravity=19.3) in aqueous suspension. Colloid & Polymer Sci 265, 522–527 (1987). https://doi.org/10.1007/BF01412506
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/BF01412506