Hydrophobic membranes for system monitoring underwater gas pipelines

• Autorzy: Rozicka, A. , Kujawski, W. , Guarnieri, V. , Lorenzelli, L. , Vasiliev, A. , Filippov, V.
• Języki publikacji: EN

Abstrakty

EN

The aim of this work was to prepare hydrophobic membranes as selective barriers to be applied in gas sensors. Two kinds of membranes were investigated: ceramic, modified with perfluoroalkylsilanes (C6F13C2H4Si(OEt)3 – C6 and C12F25C2H4Si(OEt)3 – C12) and formed from polydimethylsiloxane (PDMS). Inorganic membranes properties after modification were tested by determining the contact angle (CA). Membrane modified by C12 was more hydrophobic (CA=148°) compared with membrane modified by C6 (CA=135°). PDMS membranes of different thickness (75-195 μm) were formed and their properties were determined by pervaporation of water and by contact angle measurements. It was shown that water transport is inversely proportional to membrane thickness and permeability coefficient was equal to 7.3_10-15 mol m-1 Pa-1 s-1. Contact angle was equal to 104°±4°. The commercial PDMS membrane properties were tested in pervaporation of water-ethanol, water-pentane and water-hexane systems and it was found that organic compound is selectively transported through the membrane (enrichment factors were equal to 4-8, 75 and 120 for ethanol, pentane and hexane, respectively). Preferential transport of organic compounds was also discussed using Hansen’s solubility parameters.

PL

Celem pracy było otrzymanie membran hydrofobowych, przewidzianych do zastosowań w sensorach gazowych. Zbadano właściwości membran: ceramicznych, modyfikowanych powierzchniowo perfluoroalkilosilanami: (C6F13C2H4Si(OEt)3 – C6 i C12F25C2H4Si(OEt)3 – C12) oraz membran uformowanych z poli(dimetylosiloksanu) (PDMS). Właściwości membran ceramicznych po modyfikacji charakteryzowano poprzez pomiar kąta zwilżania (CA). Membrana modyfikowana roztworem C12 (CA=148°) posiadała bardziej hydrofobowe właściwości niż membrana modyfikowana C6 (CA=135°). Uformowano membrany z PDMS o różnej grubości (75-195 μm), oznaczono kąt zwilżania dla wody oraz określono ich właściwości perwaporacyjne w kontakcie z wodą. Wykazano, że transport wody przez membranę jest odwrotnie proporcjonalny do grubości błony, a współczynnik przepuszczalności wody wynosi 7.3_10-15 mol m-1 Pa-1 s-1. Właściwości komercyjnej membrany PDMS określono w kontakcie z mieszaninami: woda-etanol, woda-pentan i woda-heksan. Wykazano przy tym, iż składnik organiczny był selektywnie transportowany przez membranę (współczynniki wzbogacenia dla etanolu, pentanu i heksanu wyniosły odpowiednio 4-8, 75 i 120). Preferencyjny transport składników organicznych zinterpretowano również, stosując współczynniki rozpuszczalności Hansena.

Słowa kluczowe

PL

membrana ceramiczna; membrana PDMS; perwaporacja; kąt zwilżania; perfluoroalkilosilany; modyfikacja powierzchni

EN

ceramic membranes; PDMS membrane; pervaporation; contact angle; perfluoroalkylsilanes; surface modification

• Czasopismo: Architecture Civil Engineering Environment
• Rocznik: 2012
• Tom: Vol. 5, no. 4
• Strony: 99--106
• Opis fizyczny: Bibliogr. 30 poz.

Twórcy

autor

Rozicka, A.

• Nicolaus Copernicus University, Faculty of Chemistry, 7 Gagarina Street, Toruń, Poland

autor

Kujawski, W.

• Nicolaus Copernicus University, Faculty of Chemistry, 7 Gagarina Street, Toruń, Poland,

autor

Guarnieri, V.

• Bruno Kessler Foundation, Via Sommarive, 18 38100 Povo di Trento, Italy

autor

Lorenzelli, L.

• Bruno Kessler Foundation, Via Sommarive, 18 38100 Povo di Trento, Italy

autor

Vasiliev, A.

• Russian Research Centre “Kurchatov Institute”, Kurchatov sq., 1, 123182, Moscow, Russian Federation

autor

Filippov, V.

• Russian Research Centre “Kurchatov Institute”, Kurchatov sq., 1, 123182, Moscow, Russian Federation

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