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National Repository of Grey Literature 11 records found  previous11 - 11  jump to record: Search took 0.01 seconds. 
pH Responsive Sol-Gel Hybrid Materials Doped With Colorimetric Sulfonphtalein pH Indicators
 Frančič, N. ; Rychtáriková, Renata ; Kuncová, Gabriela ; Lobnik, A.
In this work, we have studied the effects of epoxy-modifications on functional properties organic-inorganic materials prepared by copolymerization of 3-glycidoxypropyl trimethoxysilane (GPTMS) a tetramethoxysilane (TMOS) with entrapped pH colorimetric indicators. Results show that the dyes are completely physically entrapped with no leaching. Sensor membranes have dynamic ranges from pH 3 - 7 (bromocresol green), pH 5 - 8 (bromocresol purple), pH 6 - 10 (bromothymol blue), and pH 2 - 5 (bromofenol blue), respectively. Thin films show excellent reproducibility, reversibility and have short response times of 200 s. We have also determined that the lower molar ratio of TMOS gave us better responses to pH changes, while the higher TMOS ratio gave us more uniform layers. The best overall results were obtained by molar ratio 5.67:1 of GPTMS and TMOS.
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National Repository of Grey Literature : 11 records found   previous11 - 11  jump to record:
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