Silica microparticles polymer with

In our study (6), porcine pancreas lipase (PPL) immobilized on silica particles (narrow distributed micron particles) was employed for ring-opening polymerization of TMC. No evidence of decarboxylation occurring during the polymerization. The results showed that silica microparticles improved immobilization efficiency much more. The most preferable polymerization temperature of TMC was 100 °C during 24h polymerization. The M of the resulting polymers was significantly increased compared with that catalyzed by... 

Cheng, K., Blumen, S.R., MacPherson, M.B., Steinbacher, J.L., Mossman, B.T., and Landry, C.C (2010) Enhanced uptake of porous silica microparticles by bifunctional surface modification with a targeting antibody and a biocompatible polymer. ACS AppL Mater. Interfaces,... 

Recently, the LbL technique has been extended from conventional nonporous substrates to macroporous substrates, such as 3DOM materials [58,59], macroporous membranes [60-63], and porous calcium carbonate microparticles [64,65], to prepare porous PE-based materials. LbL-assembly of polyelectrolytes can also be performed on the surface of MS particles preloaded with enzymes [66,67] or small molecule drugs [68], and, under appropriate solution conditions, within the pores of MS particles to generate polymer-based nanoporous spheres following removal of the silica template [69]. 

If in a hydrophilic—hydrophobic silicas—water mixture (prepared at >10,000 rpm), the inner layer is composed of hydrophobic silica and the outer layer is of hydrophilic silica that air bubbles can be entrapped in the microspheres. The bulk density of this fresh gel-like mixture can be relatively low, 0.5-0.6 g/cm due to entrapped air (Mironyuk et al. 1994,1999). In the case of the opposite structure of the composition, water is located inside microparticles with the hydrophobic outer shell that give the dry water material mentioned earlier. In the dry water materials, instead of hydrophilic silica, starch or other superhydrophilic polymers or other hydrophilic compounds can be used to provide stronger and longer retention of water inside microparticles. 

RET in conjunction with nano- or microparticles can be principally divided into three different categories. First, dye-doped particles can be used as RET partner, usually as Dret> nd mostly a dye attached to the target analyte serves as the RET acceptor. The particles employed here are mainly polymer and silica particles and their size commonly lies between 20 nm and 2 pm. Moreover, this approach can be further divided into three strategies. 

Enhancement of photostability of organic dye molecules has been observed in polymer matrices co-doped with dielectric oxide microparticles (Ahmad, 2007). Duarte and James (2003,2004) demonstrated a class of dye-doped organic-inorganic solid-state gain media based on silica nanoparticles uniformly dispersed in poly(methyl... 

Two basic types of packings have been used in LC, pellicular and porous particle. The original pellicular particles were spherical, nonporous. glass or polymer beads with typical diameters of 30 to 40 pm. A thin, porous layer of silica, alumina, a polystyrene-divinyl-benzene synthetic resin, or an ion-exchange resin was deposited on the surface of these beads. Small porous microparticles have completely replaced these large pellicular particles. In recent years, small (- 5 pm) pellicular packings have been reintroduced for separation of proteins and large biomolecules. 

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