Effect of water activity and gaseous phase relative humidity on microcrystalline cellulose water contact angle measured by the Washburn technique.pdfVIP

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Effect of water activity and gaseous phase relative humidity on microcrystalline cellulose water contact angle measured by the Washburn technique.pdf

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Effect of water activity and gaseous phase relative humidity on microcrystalline cellulose water contact angle measured by the Washburn technique.pdf

Colloids and Surfaces A: Physicochem. Eng. Aspects 500 (2016) 118–126 Contents lists available at ScienceDirect Colloids and Surfaces A: Physicochemical and Engineering Aspects journal homepage: /locate/colsurfa Effect of water activity and gaseous phase relative humidity on microcrystalline cellulose water contact angle measured by the Washburn technique Martim Victor Hammes a, Alexandre Hahn Englert b, Caciano Pelayo Zapata Noren? a c, Nilo Sérgio Medeiros Cardozo a,? a Laboratory of Polymer Technology and Processing, Department of Chemical Engineering, Federal University of Rio Grande do Sul (UFRGS), Rua Eng. Luiz Englert, s/n., CEP 90040-040, Porto Alegre, RS, Brazil b Department of Physical Chemistry, Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonc? alves, 9500, CEP 91501-970, Porto Alegre, RS, Brazil c Laboratory of Food Dehydration, Institute of Food Science and Technology (ICTA), Federal University of Rio Grande do Sul (UFRGS), Av. Bento Gonc? alves, 9500, CEP 91501-970, Porto Alegre, RS, Brazil highlights ? Microcrystalline cellulose (MCC) wettability was assessed by the Washburn technique. ? Contact angle (?) decreased linearly with increasing water activity. ? ? showed stronger dependence on the moisture content below monolayer moisture content. ? Relative humidity showed to be a relevant parameter when using the Washburn technique. ? The Washburn technique was accurate in quantifying the effects of the studied variables. graphical abstract article info Article history: Received 17 February 2016 Received in revised form 4 April 2016 Accepted 6 April 2016 Available online 7 April 2016 Keywords: Microcrystalline cellulose Capillary rise Washburn technique abstract The goal of this work was to examine the effect of water activity (aw) of a material—in this case microcrystalline cellulose (MCC)—on the contact angle obtained by the Washburn technique. The effect of the difference between the relative humidity of the gase