Mesoporous silica functionalized with methyl red as colorimetric pH sensor.

Автор(и)

  • M. O. Dziazko Chuiko Institute of Surface Chemistry of NAS of Ukraine, 17 General Naumov Str., Kyiv, 03164, Ukraine
  • N. V. Roik Chuiko Institute of Surface Chemistry of NAS of Ukraine, 17 General Naumov Str., Kyiv, 03164, Ukraine

Анотація

Construction of pH sensors is widely studied for a variety of chemical, medical, and biochemical applications. One of the most reliable approaches to create pH sensing material with improved properties is immobilization of acid-base indicator on solid support. Among inorganic proton permeable carriers silica attracts considerable attention due to high chemical and thermal stability, good biocompatibility and optical transparency, negligible swelling in solvents, easy control on the structural parameters and chemical composition.

In the present work, we focused our attention on the synthesis of pH sensor based on mesoporous amorphous silica – silochrome C-120 with chemically immobilized methyl red (MR). On the first stage, aminopropyl silica was synthesized by the reaction between silanol groups of silica surface and ethoxy groups of (3-aminopropyl)triethoxysilane. Then, grafting of acid-base indicator MR on aminopropyl silica was realized under mild conditions by use of coupling agent (1,1-carbonyldiimidazole).

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