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Sol–gel entrapment method was used to entrap phenol red (PR) pH indicator into mesoporous silica materials, in presence of ethanediyl-1,2-bis (dimethyldodecylammonium bromide (Gemini 12-2-12), alkyl hydroxyethyl dimethyl ammonium chloride (HY, R = 12–14) and sodium dodecyl sulfate (SDS) surfactants. The use of surfactants has modified the morphology and porosity of silica host matrix for better sensing...
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