Topic
Phosphotungstic acid
About: Phosphotungstic acid is a research topic. Over the lifetime, 1925 publications have been published within this topic receiving 38059 citations. The topic is also known as: Phosphowolframic acid.
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TL;DR: In this article, a hierarchically fibrous solid acid catalyst was facilely prepared by supporting Keggin-type phosphotungstic acid (HPW) on fibrous substrate of mesoporous TiO2-Al2O3 binary oxide nanofiber bundles.
9 citations
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TL;DR: The Mytilus acrosome was investigated by histochemical methods combined with electron microscopy, using silver methenamine (SM) and phosphotungstic acid (PTA) staining, as well as some chemical and enzymatic pretreatments followed by the staining.
9 citations
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TL;DR: In this paper, chitosan (CS) membranes filled by GPTMS-modified montmorillonite particles were prepared and characterized by FTIR, and the result of FTIR obtained the peak wavenumber of 2940, 1471 and 1390 cm -1 referring to vibration stretching of CH 2, bending of CH 3 and CH 3 forming epoxy groups in silane.
Abstract: Montmorillonite was functionalized by (3-glycidyloxypropyl) trimethoxy silane (GPTMS). Subsequently, chitosan (CS) membranes filled by GPTMS-modified montmorillonite particles were prepared and characterized by FTIR. The result of FTIR obtained the peak wavenumber of 2940, 1471 and 1390 cm -1 referring to vibration stretching of CH 2 , bending of CH 2 and CH 3 form epoxy groups in silane, respectively which indicated modification of montmorillonite by silane. Compared with the pure CS and CS/PWA-MMT membrane, these CS/PWA-MMT/Silane hybrid membranes show apparently high proton conductivity and the lower methanol permeability, which could be assigned to the better interfacial morphology and compatibility between chitosan matrix and GPTMS-modified montmorillonite. In all the prepared CS/PWA-MMT/Silane hybrid membranes, the CS membrane filled by 10% GPTMS-modified montmorillonite particles exhibits the highest proton conductivity and the lowest methanol permeability, which is 19.15 x 10 -3 S.cm -1 at 80 °C and 4.33 x 10 -8 cm 2 .s -1 , respectively. The results imply that CS/PWA-MMT silane 10% membrane has better interaction of interfacial morphology and compatibility between chitosan matrix and GPTMS-modified montmorillonite particles.
9 citations
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TL;DR: In this paper, it was shown that phosphotungstic acid, introduced as solid nanoparticles into polyvinyl alcohol films, is a more effective dehydration catalyst than HCl, since in contrast to HCl it does not evaporate from the film during heat treatment.
Abstract: In order to obtain linear polyenes in polyvinyl alcohol films via acid-catalyzed thermal dehydration of the polyvinyl alcohol, we used phosphotungstic acid as the catalyst: a safe and heat-stable solid chemical compound. We established that phosphotungstic acid, introduced as solid nanoparticles into polyvinyl alcohol films, is a more effective dehydration catalyst than hydrochloric acid, since in contrast to HCl it does not evaporate from the film during heat treatment.
9 citations