Influence of Ph and Dye Concentration on the Physical Properties and Microsyructure of New Coumarin 4 Doped SiO2-PDMS ORMOSIL

Title
Influence of Ph and Dye Concentration on the Physical Properties and Microsyructure of New Coumarin 4 Doped SiO2-PDMS ORMOSIL
Authors
Yoo, Y.C.; Cho, N.H.; Cho, W.S.; Whang, C.M.
Keywords
physical properties, microstructure
Issue Date
2003-03
Publisher
KOREAN CHEMICAL SOC
Abstract
Physical properties and microstructure of new coumarin 4 doped SiO2-PDMS ORMOSILs, synthesized by one-step (OS, acid-catalysis) and two-step (TS, acid-base catalysis) routes of sol-gel method with varying pH (0.6 to 7) and dye content (5 x 10(-4) to 5 x 10(-2) mole), are reported. BET, UV-visible spectroscopy and SEM were used for characterizations. The increase in acid or base concentration increased the size of pores and aggregated silica particles. The samples with pH less than or equal to 2.5 were transparent and attributed to the small size of pores (similar to20 Angstrom) and silica particles. The samples with pH > 2.5 were translucent or opaque due to non-uniform pore system formed by voids and large aggregated silica particles. The surface area was found a key factor controlling the interactions between the gel matrix and the dye. The OS samples with the highest dye concentration exhibited the minimal values of pore size, surface area and silica particle size, resulting in the concentration-quenching phenomenon.
URI
http://dspace.inha.ac.kr/handle/10505/20320
ISSN
0253-2964
Appears in Collections:
College of Engineering(공과대학) > Materials Science & Engineering (신소재공학) > Journal Papers, Reports(신소재공학 논문, 보고서)
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