Various types of polydiacetylene microcrystals fabricated by reprecipitation technique and some applications

The reprecipitation method is a useful technique to fabricate organic microcrystals such as polydiacetylene (PDA), low-molecular-weight aromatic compounds, organic functional dyes, which features are located in a mesoscopic phase between a single molecule and bulk crystals, and organic microcrystals are expected to exhibit peculiar optical and electronic properties. In the present article, the effects of added surfactants and temperature were investigated to develop and establish further the reprecipitation method to control crystal size, shape of PDA microcrystals. Especially, we were much interested in reprecipitation conditions and formation mechanism to form fibrous PDA microcrystals. In addition, as some trial applications, it has been successful to trap an isolated PDA microcrystal and to prepare well-defined PDA microcrystal thin film, using a layer-by-layer procedure. This technique utilized an electrostatic adsorption between microcrystals with highly negative ζ-potential in an aqueous dispersion liquid and polyelectrolyte (polycation) film. As a result, the value of χ(3)(ω) for the resulting layered PDA microcrystal thin film was confirmed to be enhanced by a factor of about 100, owing to concentration effect. Copyright © 2000 John Wiley & Sons, Ltd.

[1]  M. Hartmann,et al.  Light scattering by small particles. Von H. C. VANDE HULST. New York: Dover Publications, Inc. 1981. Paperback, 470 S., 103 Abb. und 46 Tab., US $ 7.50 , 1984 .

[2]  G. Wegner,et al.  Solved and Unsolved Problems in the Solid-State Polymerization of Diacetylenes , 1984 .

[3]  E. Hanamura.  Gigantic nonlinear optical polarizability of semiconductor microcrystallites , 1987 .

[4]  Shuji Okada,et al.  Solid-state Polymerization of Diacetylene Microcrystals , 1995 .

[5]  S. Okada,et al.  Optical Properties of Perylene Microcrystals , 1997 .

[6]  Hanamura.  Rapid radiative decay and enhanced optical nonlinearity of excitons in a quantum well. , 1988, Physical review. B, Condensed matter.

[7]  Preparation and Characterization of Poly-Diacetylene Microcrystals , 1997 .

[8]  Jayant Kumar,et al.  Self Assembly of Organic Microcrystals 1: Electrostatic Attachment of Polydiacetylene Microcrystals on a Polyelectrolyte Surface , 1998 .

[9]  Kyoji Komatsu,et al.  Size Control of Polydiacetylene Microcrystals , 1996 .

[10]  S. Usui,et al.  Cationic flotation of quartz from an artificial mixture with hematite using hexylamine , 1988 .

[11]  M. Bawendi,et al.  Synthesis and characterization of nearly monodisperse CdE (E = sulfur, selenium, tellurium) semiconductor nanocrystallites , 1993 .

[12]  C. Bosshard,et al.  Organic Nonlinear Optical Materials , 2001, CLEO/Europe Conference on Lasers and Electro-Optics.

[13]  J. Depasse,et al.  The stability of amorphous colloidal silica , 1970 .

[14]  Brian S. Wherrett,et al.  Nonlinear refractive indices of polydiacetylene microcrystals , 1997, Photonics West.

[15]  E. W. Stryland,et al.  Sensitive Measurement of Optical Nonlinearities Using a Single Beam Special 30th Anniversary Feature , 1990 .

[16]  Shuji Okada,et al.  Crystal Growth of Perylene Microcrystals in the Reprecipitation Method , 1998 .

[17]  P. Roussignol,et al.  Quantum confinement mediated enhancement of optical kerr effect in CdSxSe1−x semiconductor microcrystallites , 1990 .

[18]  R. Kubo.  Electronic Properties of Metallic Fine Particles. I. , 1962 .

[19]  G. Wegner,et al.  Macroscopic single crystals of polymers by solid-state polymerization: a study of the monomer to polymer phase transformation of 1,6-dicarbazolyl hexadiyne , 1980 .

[20]  U. Dürig,et al.  Near‐field optical‐scanning microscopy , 1986 .

[21]  S. Okada,et al.  Size and Form Control of Titanylphthalocyanine Microcrystals by Supercritical Fluid Crystallization Method , 1998 .

[22]  A. L. Loeb,et al.  Calculation of the electrophoretic mobility of a spherical colloid particle , 1966 .

[23]  P. Buffat,et al.  Size effect on the melting temperature of gold particles , 1976 .

[24]  E. W. Stryland,et al.  High-sensitivity, single-beam n(2) measurements. , 1989, Optics letters.

[25]  Nobutsugu Minami,et al.  A Novel Preparation Method of Organic Microcrystals , 1992 .