J. Phys. II France
Volume 6, Numéro 12, December 1996
Page(s) 1657 - 1662
DOI: 10.1051/jp2:1996154
J. Phys. II France 6 (1996) 1657-1662

Growth of Molecular Superlattice in Fully Hydrated Dipalmitoylphosphatidylcholine during Subgel Phase Formation Process

Hiroshi Takahashi, Kouichi Hatta and Ichiro Hatta

Department of Applied Physics, School of Engineering, Nagoya University, Chikusa-ku, Nagoya, 464-01, Japan

(Received 13 August 1996, received in final form 30 September 1996, accepted 14 October 1996)

Recently, it has been reported that the structure of the subgel phase of dipalmitoylphosphatidylcholine (DPPC) is characterized by two lattices, i.e., a hydrocarbon lattice and a molecular superlattice [1]. On the basis of the results, the domain growth of the molecular superlattice in fully hydrated DPPC multilamellar vesicles at $2.5~^\circ$C was studied by means of X-ray diffraction. The change of the intensities of the (11) diffraction peak originated from the molecular superlattice was analyzed by the Kolmogorov-Avrami theory. We found that the effective dimensionality of the growing domains is $2.3 \pm 0.4$. This result indicates that the domains of the molecular superlattice grow two-dimensionally during the subgel phase formation process, i.e., the domain grows in a single bilayer and is independent between the domains in adjacent bilayers.

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