نتایج جستجو برای: gel chemistry

تعداد نتایج: 212056  

Journal: :iranian journal of chemistry and chemical engineering (ijcce) 2008
asghar karami gholam reza vahdany mohammad abedi mehdi fattahi

in this study, alkaline colloidal silica was prepared by titration of an alkaline solution such as sodium silicate with silicic acid in constant range of ph  .this constant range of ph was achieved by using concentrated soduim silicate solutions as ph adjusting solutions during titration.the sodium silicate solutions  having a variety of concentrations were passed  through ion-exchange resin to...

Journal: :Accounts of Chemical Research 2007

Journal: :international journal of nano dimension 0
m. tanhaei department of chemistry, faculty of science, imam khomeini, international university, ghazvin, iran. v. mohammady department of chemistry, faculty of science, imam khomeini, international university, ghazvin, iran.

sol–gel chemistry is an efficient tool to control the morphology and reactivity of solids. drying is the crucial step due to the capillary forces exerted during the classic ambient drying process, which induces the collapse of the wet gel porosity. the use of n, n-dimethylformamide (dmf), a newly found dcca were found to be effective in the sol–gel synthesis of crack-free silica gel monolith fr...

Journal: :Inorganic chemistry frontiers 2022

TSol-gel chemistry, while being extremely established, is to this day not fully understood, and much of the underlaying chemistry mechanisms are yet be unraveled. Here, we elaborate on...

2007
J. M. Nedelec Wieslaw Strek

The development of scintillating materials is believed to reach a new step by controlling their preparation on a nanometric level. Sol-Gel chemistry offers very unique tools for nanoscale mastering of the materials preparation. In particular, shaping of the materials as thin films or nanoparticles offers new application in medical imaging. The control of doping ions dispersion thanks to soft ch...

M. Tanhaei, V. Mohammady

Sol–gel chemistry is an efficient tool to control the morphology and reactivity of solids. Drying is the crucial step due to the capillary forces exerted during the classic ambient drying process, which induces the collapse of the wet gel porosity. The use of N, N-dimethylformamide (DMF), a newly found DCCA were found to be effective in the sol–gel synthesis of crack-free silica gel monolith fr...

M. Tanhaei, V. Mohammady

Sol–gel chemistry is an efficient tool to control the morphology and reactivity of solids. Drying is the crucial step due to the capillary forces exerted during the classic ambient drying process, which induces the collapse of the wet gel porosity. The use of N, N-dimethylformamide (DMF), a newly found DCCA were found to be effective in the sol–gel synthesis of crack-free silica gel monolith fr...

Journal: :iranian journal of catalysis 2013
saeed khodabakhshi mojtaba baghernejad

silica gel has been used for synthesis of biscoumarin derivatives starting from 4-hydroxycoumarin and aryl aldehydes. the reaction conditions are completely in agreement with green chemistry principles including sing water as media and a recyclable and safe catalyst. this method is also simple and inexpensive and leads to high yield of products in short reaction times.

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