Preparation and conductivity of substituted germanic heteropoly acids polyethylene glycol hybrid materials

Abstract

In this work, the polyethylene glycol (PEG) hybrid materials composited with substituted germanic heteropoly acids were prepared. Infrared (IR) spectra revealed that the Keggin structure characteristic of the GeM 11 VO 40 52 anion were present in the hybrid materials. At room temperature (208C), the conductivity of the products is 4.07 3 10 23 S cm 21 and 2.12 3 10 23 S cm 21 , respectively. The results indicated that the conductivity of substituted germanic heteropoly acids PEG hybrid materials is higher than that of the corresponding pure substituted germanic heteropoly acids. According to the experimental results, we proposed a possible mechanism of the proton conduction of the hybrid materials.

Pentadecatungstotrivanadodiphosphoric heteropoly acid with Dawson structure: Synthesis, conductivity and conductive mechanism

“…The conductivity can be obtained from the result, as σ = L/(S × R), where R is the resistance, L is the thickness, and S is the area of the tablet. 15 The calculation shows that at room temperature (26 °C) and 75% relative humidity (RH), the This journal is © The Royal Society of Chemistry 2012 conductivity value of the product is 3.64 × 10 −2 S cm −1 . This compound is a new solid high-proton conducting HPA.…”

Synthesis and conductivity of heptadecatungstovanadodiphosphoric heteropoly acid with Dawson structure

“…7). The conductivity can be obtained from these results, as = L/(S × R), where R is the resistance, L is the thickness, and S is the area of the tablet [21]. The calculation shows that at room temperature (26 • C) and 75% relative humidity (RH), the conductivity value of the product is 3.10 × 10 −2 S cm −1 .…”

Synthesis and conductivity of substituted heteropoly acid with Dawson structure H7[Ga(H2O)P2W17O61]·18H2O

“…In general, we take the temperature of the exothermic peak of DTA curves of compounds as a way of characterizing their thermostability [12]. Figure 6 is …”