Abstract. Poly (St-MAn-APTES)/silica hybrid materials were successfully prepared from styrene (St), maleic anhydride (MAn) and tetraethoxysilane (TEOS) in the presence of a coupling agent 3-aminopropyltriethoxysilane (APTES), by freeradical solution polymerization and in situ sol-gel process. The TEOS content varied from 0 to 25 wt%. Fourier transform infrared spectroscopy and 29 Si nuclear magnetic resonance spectroscopy were used to characterize the structure of the hybrids (condensed siloxane bonds designated as Q 1 , Q 2 , Q 3 , Q 4 , with 3-aminopropyltriethoxysilane having mono-, di-, tri, tetra-substituted siloxane bonds designated as T 1 , T 2 and T 3 ). The results revealed that Q 3 , Q 4 and T 3 were the major microstructure elements in forming a network structure. The hybrid materials were also characterized by the methods of solvent extraction, Transmission Electron Microscopy (TEM), differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) for determining the gel contents, particle size and thermal performance. The results showed that gel contents in the hybrid materials were much higher, the SiO2 phase were well dispersed in the polymer matrix, silicon dioxide existed at nanoscale in the composites, which had excellent thermal stability.
Novel fluorescence and SERS encoded microspheres based on poly(glycidyl methacrylate) (PGMA) microspheres were developed by a controllable approach. The microspheres were encoded by four fluorescence dyes and three surface enhanced Raman spectra (SERS) probes. Multiple dyes could be simultaneously incorporated into the PGMA microspheres for encoding and the intensity of the fluorescence can be tuned by adjusting the feeding ratio. The PGMA microspheres were coated by silver nanoparticles and encoded by single and multiple SERS reporters. The fluorescence and SERS joint encoded PGMA microspheres were fabricated. All the fluorescence encoding signals can be excited at 488 nm. The fluorescent and SERS signals of dual-mode microspheres could be obtained from two optical channels and non-overlapping of emission spectra was observed in these encoded microspheres, which greatly increased the encoding capacity. The as prepared fluorescence and SERS encoded microspheres possess stable and distinct spectral encoding signals, large encoding capacity.
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