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Heat release at the wetting front during capillary filling of cellulosic micro-substrates

Terzis, A. and Roumeli, E. and Weishaupt, K. and Brack, S. and Aslannejad, H. and Groß, J. and Hassanizadeh, S. M. and Helmig, R. and Weigand, B. (2017) Heat release at the wetting front during capillary filling of cellulosic micro-substrates. Journal of Colloid and Interface Science, 504 . pp. 751-757. ISSN 0021-9797. doi:10.1016/j.jcis.2017.06.027.

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Spontaneous imbibition in cellulosic materials is an expanding field of research due to the direct applicability in paper-based microfluidics. Here, we show experimentally, using simultaneous thermal and optical imaging that the temperature at the wetting front during capillary filling of paper is temporarily increased, even if the imbibed fluid and the cellulosic substrate are initially at isothermal conditions. Several liquids and two types of filter paper, characterised by scanning electron microscopy (SEM) and X-ray diffraction (XRD) analysis, were investigated demonstrating a significant temperature rise at the wetting front that cannot be neglected form the process. The temperature rise is found to be related to the energetics of imbibition compounds, including acid-base contributions, that result in electrostatic attractions as the liquid molecules are adhered on the fiber surfaces upon capillary contact.

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Additional Information:© 2017 Elsevier Inc. Received 17 May 2017, Accepted 7 June 2017, Available online 8 June 2017.
Subject Keywords:Paper-based microfluidics; Thermodynamics; Capillary dynamics; Interfacial energy
Record Number:CaltechAUTHORS:20170627-080736143
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Official Citation:A. Terzis, E. Roumeli, K. Weishaupt, S. Brack, H. Aslannejad, J. Groß, S.M. Hassanizadeh, R. Helmig, B. Weigand, Heat release at the wetting front during capillary filling of cellulosic micro-substrates, Journal of Colloid and Interface Science, Volume 504, 15 October 2017, Pages 751-757, ISSN 0021-9797, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:78590
Deposited By: Tony Diaz
Deposited On:27 Jun 2017 19:55
Last Modified:15 Nov 2021 17:41

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