Abstract
Fe2O3-Bi2O3-B2O3 (FeBiB) glasses were developed as novel pH responsive hydrophobic glasses. The influence of the glass composition on the pH sensitivity of FeBiB glasses was investigated. The pH sensitivity drastically decreased with decreasing B2O3 content. A moderate amount of Fe2O3 and a small amount of B2O3 respectively produces bulk electronic conduction and a pH response on glass surfaces. Because the remaining components of the glass can be selected freely, this discovery could prove very useful in developing novel pH glass electrodes that are self-cleaning and resist fouling.
Highlights
Important customer issues in pH measurement are a decrease in pH sensitivity and an increase in pH response time, which mainly arise from the fouling due to contamination of the responsive glass membrane and liquid junction, and from the change in concentration of the internal liquid [1]
When the Bi2O3 content increases to 79.7 mol %, the B2O3 content decreases to 0.3 mol %, the change in potential related to pH sensitivity drastically decreased
The influence of Bi2O3 content on the pH responsivity, electrical resistivity, and hydrophobicity was investigated for 20FeyBiB glasses in order to reveal the role of each glass component
Summary
Important customer issues in pH measurement are a decrease in pH sensitivity and an increase in pH response time, which mainly arise from the fouling due to contamination of the responsive glass membrane and liquid junction, and from the change in concentration of the internal liquid [1]. The contact angle for water of FeBiB glasses was relatively high (about 90¥), similar to BiB glasses, and tended to increase slightly with increasing Bi2O3 content, regardless of Fe2O3 content In this sense, we consider that Fe2O3 and Bi2O3 play an important role in electrical conduction in the bulk glass, and in the pH response and hydrophobicity, respectively. We consider that Fe2O3 and Bi2O3 play an important role in electrical conduction in the bulk glass, and in the pH response and hydrophobicity, respectively Such novel lithium-free nonsilicate pH responsive glasses are expected to show a short pH response time, because they are a new type of pH glass electrodes based on “electronic conduction” that is different from the “ionic conduction” present in commercial lithium silicate glasses.
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