Thin films poly -silica

Figure 22.3 Schematic representation of the different microdomains generated upon incorporation of pre-dyed silica nanoparticles to poly(dimethylsiloxane) to produce an oxygensensing thin film. The silica particles are represented by the largest circles, the PDMS polymer chains by the grey ribbons, and the indicator dye molecules by the smallest red circles (the bright red circles depict those placed in PDMS-free silica regions and the dark red circles indicate those adsorbed onto silica regions in contact with the silicone backbone).

Titania and silica glass thin films Au, Pt Photoreduction of HAuCl and K.2PtCl4 in ethanol-water in the presence of poly(N-vinyl-2-pyrrolidone) or poly(methyl vinyl ether led to metal particles (sizes depended on solvent composition the smallest, 2.8 nm in diameter, was obtained in 100% alcohol) which were mixed with Ti(i-OC3H7)4 and acetylacetone under N2. Subsequent to 30 minutes of stirring, exposure to moisture produced Ti02-embedded metal particles 74... 

Detailed information on the conformation and orientation of polysilane thin films has been obtained by anisotropic PL.80 The alignment of poly (methylphenylsilane-co-methacryloxypropyltriethoxysilane) [P(MPS-co-MPTES)] adsorbed on silica substrates has been studied at 14 K using an attenuated He-Cd polarized laser beam (X = 325 nm) as the excitation source. Laser irradiation decreases the PL intensity, blue shifts the PL peak position... 

FIGURE 1.302 CP/MAS NMR spectra of the hybrid films at the silica content CsiOj=(l) 0, (2) 10, (3) 33, (4) 40 and (5) 50 wt%. (Adapted from Polymer, 44, Yu, Y.-Y., Chen, C.-Y., and Chen, W.-C., Synthesis and characterization of organic-inorganic hybrid thin films from poly(acrylic) and monodispersed colloidal silica, 593-601, 2003. Copyright 2002, with permission from Elsevier.)... 

Yu et al. (2003) synthesized hybrid thin films containing nanosized inorganic domains from poly(acrylic) and monodispersed colloidal silica with bound 3-(trimethoxysilyl)propyl methacrylate (MSMA) for potential applications as passive films in optical devices. The latter was polymerized with acrylic monomer to form a precursor solution, which was spin-coated and cured to form hybrid films. The silica content in the hybrid thin films was varied from 0 to 50 wt% (Figure 1.302). The coverage area of silica particles by the MSMA decreased with increasing silica content and resulted in the aggregation of silica particles in the hybrid films, and the silica domains were 20-35 nm in size. 

Yu, Y.-Y, Chen, C.-Y, and Chen, W.-C. 2003. Synthesis and characterization of organic-inorganic hybrid thin films from poly(acrylic) and monodispersed colloidal silica. Polymers 44 593-601. 

Figure 19.2 PL and absorption spectra of thin films of regioregular polythiophenes HT-9d (a) and HHTT-9d (b), spin-coated on a fused-silica substrate. Reproduced with permission from P. Barta, F. Cacialli, R. H. Friend, M. Zagdrska, Efficient photo and electroluminescence of regioregular poly(alkylthiophene)s, J. Appl. Phys., 84, 6279-6284 (1998). Copyright 1998 American Institute of Physics.

Yang SH, Choi IS (2010) Thickness control of biomimetic silica thin films grafting density of poly (2-(dimethylamino)ethyl methacrylate) templates. Anglais 31 753... 

Thin films of blended deuterated polystyrene (dPS) and poly(vinyl methyl ether) (PVME) were imaged as a fimction of the dPS PVME ratio. Near the critical composition of 35% dPS, an imdulating, spinodal-like structure was observed, whereas for compositions away from the critical mixture ratio, regular mounds or holes (< dPS < < crit and < dPS > (pent, respectively) were present. These variations were assigned to surface tension effects (120). Blends of PBD, SBR, isobutylene-brominated p-methylstyrene, PP, PE, natural rubber, and isoprene-styrene-isoprene block rubbers were imaged (Fig. 18). Stiff, styrenic phases and rubbery core-shell phases were evident as the authors utilized force-modulated afm to determine detailed microstructure of blends, including those with fillers such as carbon-black and silica (121). 

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