FINE PARTICLE DISPERSION

• Main Authors: NAKAMURA HIROSHI, SEKI TAKAHIRO, TAKEOKA TAKAKAZU, ISHII MASAHIKO
• Format: Patent
• Language: English
• Published: 18.03.2010
• Subjects: CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; GLASS; JOINING GLASS TO GLASS OR OTHER MATERIALS; METALLURGY; MINERAL OR SLAG WOOL; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; PHYSICS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; THEIR RELEVANT APPARATUS; TRANSPORTING

PROBLEM TO BE SOLVED: To provide a fine particle dispersion in which the alignment structure of fine particles is stably maintained and which reflects light with specified wavelength and sufficiently lowers the angle dependency of reflected light with peak wavelength changed in accordance with the alteration of the incident angle of the light. SOLUTION: The fine particle dispersion is obtained by dispersing primary fine particles, having the average particle diameter in a range of 50 nm to 10 μm and a Cv value of the particle diameter of 10% or less, in a medium. The alignment structure of the primary fine particles in the dispersion is an amorphous structure and at the same time a short-range ordered structure satisfying the following conditions (A) and (B): [condition (A)] based on a scanning electron microscopic photograph of the dispersion, the value of distance r in a first maximum value of a radial distribution function in a plane calculated according to the following expression is one to two times as much as the average particle diameter of the primary particles: g(r)=ä1/(ρ)}×ädn/da}, wherein g(r) is the radial distribution function; (ρ) is an average particle density in the plane; dn is the number of the primary particles existing in a region between a circle with a distance r and a circle with a distance r+dr from any optional primary particle; and da is a surface area (2πr×dr) of the region, and [condition (B)] the minimum value of the radial distribution function between the first maximum value of the radial distribution function and the second maximum value adjacent to the first maximum value is 0.5 or lower. COPYRIGHT: (C)2010,JPO&INPIT