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            <title xml:lang="en">Liquid-solid interaction at nanoscale and its application in vegetal biology</title>
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            <idno type="halRefHtml">&lt;i&gt;Colloids and Surfaces A: Physicochemical and Engineering Aspects&lt;/i&gt;, 2011, 383 (1-3), pp.17-22. &lt;a target="_blank" href="https://dx.doi.org/10.1016/j.colsurfa.2011.01.004"&gt;&amp;#x27E8;10.1016/j.colsurfa.2011.01.004&amp;#x27E9;&lt;/a&gt;</idno>
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            <note type="commentary">16 pages 1 figure New modern concept of the sap ascent in high trees takes the disjoining pressure in nanofilms of liquids into account. The motion of the sap is related to thin films slippering on the xylem walls.</note>
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                <term xml:lang="en">ascent of sap</term>
                <term xml:lang="en">Navier length</term>
                <term xml:lang="en">interface motions</term>
                <term xml:lang="en">cohesion-tension theory</term>
                <term xml:lang="en">disjoining pressure</term>
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              <p>The water ascent in tall trees is subject to controversy: the vegetal biologists debate on the validity of the cohesion-tension theory which considers strong negative pressures in microtubes of xylem carrying the crude sap. This article aims to point out that liquids are submitted at the walls to intermolecular forces inferring density gradients making heterogeneous liquid layers and therefore disqualifying the Navier-Stokes equations for nanofilms. The crude sap motion takes the disjoining pressure gradient into account and the sap flow dramatically increases such that the watering of nanolayers may be analogous to a microscopic flow. Application to microtubes of xylem avoids the problem of cavitation and enables us to understand why the ascent of sap is possible for very high trees.</p>
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