Growth of silica particles in surfactant gel

Abstract Growth of silica particles produced by the hydrolysis of tetraethoxy silane (TEOS) in gels of the cationic surfactant, cetyltrimethyl ammonium bromide (CTAB), was investigated by static light scattering and dynamic light scattering measurements. The time evolution of the size of the silica particles was estimated by the static and the dynamic correlation lengths obtained from the two measurements. Both the growth rate and the final size were smaller at higher concentrations of CTAB, indicating that a more confined network exerted a more restrictive effect on the particle growth. The random motion of silica particles was more severely restricted when the particle was larger and the network mesh size was smaller at higher CTAB concentrations. This restriction of movement resulted in the cessation of the growth of silica particles.

[1]  K. Kurumada,et al.  Structure and formation process of silica microparticles and monolithic gels prepared by the sol-gel method , 1998 .

[2]  P. Lianos,et al.  Formation of TiO2 Nanoparticles in Reverse Micelles and Their Deposition as Thin Films on Glass Substrates , 1997 .

[3]  M. Pileni,et al.  Syntheses of copper nanoparticles in gelified microemulsion and in reverse micelles , 1997 .

[4]  K. Kurumada,et al.  Effect of the transient network structure on the growth of microparticles through aggregation , 1997 .

[5]  John Wang,et al.  Ultrafine zirconia powders via microemulsion processing route , 1997 .

[6]  H. Chan,et al.  A novel method for the synthesis of perovskite-type mixed metal oxides by the inverse microemulsion technique , 1996, Journal of Materials Science.

[7]  Hikichi,et al.  Probe diffusion in gels. , 1996, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics.

[8]  A. Maitra,et al.  Preparation of acicular γ-Fe2O3 particles from a microemulsion-mediated reaction , 1996 .

[9]  Paulo A. Netz,et al.  Computer simulation studies of anomalous diffusion in gels: Structural properties and probe‐size dependence , 1995 .

[10]  N. Nemoto,et al.  Dynamic Light Scattering of CTAB/NaSal Threadlike Micelles in a Semidilute Regime. 3. Dynamic Coupling between Concentration Fluctuation and Stress , 1995 .

[11]  T. Hirai,et al.  Preparation of Metal Sulfide Composite Ultrafine Particles in Reverse Micellar Systems and Their Photocatalytic Property , 1994 .

[12]  H. Chan,et al.  Preparation of fine LaNiO3 powder from oxalate precursors via reactions in inverse microemulsions , 1994 .

[13]  N. Nemoto,et al.  Dynamic light scattering of CTAB/sodium salicylate long threadlike micelles in the semidilute regime: applicability of the dynamic scaling law , 1993 .

[14]  Wu,et al.  Nonergodicity and light scattering from polymer gels. , 1992, Physical review. A, Atomic, molecular, and optical physics.

[15]  Suzuki,et al.  Quasielastic-light-scattering study of the movement of particles in gels: Topological structure of pores in gels. , 1992, Physical review. B, Condensed matter.

[16]  Sorensen Cm,et al.  Anomalous diffusion in aqueous solutions of gelatin. , 1992 .

[17]  P. Pusey,et al.  Dynamic and static light scattering by aqueous polyacrylamide gels , 1991 .

[18]  P. Pusey,et al.  Dynamic light scattering by nonergodic media: Brownian particles trapped in polyacrylamide gels. , 1990, Physical review. A, Atomic, molecular, and optical physics.

[19]  P. Pusey,et al.  Dynamic light scattering by non-ergodic media , 1989 .