نتایج جستجو برای: silica polymerization

تعداد نتایج: 67004  

Journal: :Macromolecular Rapid Communications 2021

Herein, the synthesis of a novel nitroxide-mediated polymerization (NMP) initiator bearing photolabile ortho-nitrobenzyl (oNB) group allowing surface-initiated NMP preparation well-defined photoresponsive polystyrene grafted on silica nanoparticles is described. The photocleavable and properties prepared materials are demonstrated using small angle X-ray scattering (SAXS) characterization.

Journal: : 2021

A method for the polymerization modification of nanoscale fumed silica by crosslinking a lignin layer adsorbed on nanosilica surface under gas dispersion medium is described. mixture phenol and formaldehyde in presence HCl proved to be most effective agent. It has been suggested that molecules occurs mechanism similar production phenol-formaldehyde resins.

2003
Simon Song Timothy J. Shepodd Anup K. Singh Brian J. Kirby

A novel method for flexibly implementing sample dialysis on microchips is introduced. Nanoporous polymer membranes (5-20 pm thickness) with up to 1OOO:l aspect ratio are fabricated in-situ on silica microchips via photopatterned phase-separation polymerization. These membranes enable selective diffusion of molecules smaller than a cutoff specified by the membrane pore size. Diffusion measuremen...

Journal: :Chemical communications 2011
Pradip K Maity Quirin M Kainz Saqib Faisal Alan Rolfe Thiwanka B Samarakoon Fatima Z Basha Oliver Reiser Paul R Hanson

The utilization of a monomer-on-monomer (MoM) intramolecular Mitsunobu cyclization reaction employing norbornenyl-tagged (Nb-tagged) reagents is reported for the synthesis of benzofused thiadiazepine-dioxides. Facile purification was achieved via ring-opening metathesis (ROM) polymerization initiated by one of three metathesis catalyst methods: (i) free metathesis catalyst, (ii) surface-initiat...

Journal: :Analytical chemistry 2001
N Tanaka H Kobayashi K Nakanishi H Minakuchi N Ishizuka

Recently, monolithic columns consisting of one piece of an organic polymer or silica with flow-through pores have been reported in the literature. These materials provide better stability and, more important, higher performance than conventional columns packed with particles. Although they can be prepared by various methods, monolithic columns prepared by the direct polymerization of monomers c...

Journal: :Analytical sciences : the international journal of the Japan Society for Analytical Chemistry 2002
Chuzo Fujimoto

This review summarizes recent developments in the field of enantiomer separation by capillary electrochromatography using fritless packed columns. Various enantiomers have been separated by employing fritless packed columns prepared in a fused silica capillary either by the immobilization of chiral packing materials by sintering or sol-gel technology or by in situ polymerization of a mixture co...

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