Liquid cohesion

The size of the contact angle depends on the magnitude of the liquid-solid adhesive force compared with that of the liquid-liquid cohesive force. Specifically, Young s equation (also called the Young and Dupre equation) indicates that... 

Figure 2.10 Dependence of the cohesion of salts of weakly polarizable cations and anions, assessed by Tg value, on the ambient temperature molar volume hence on interionic spacing [(r -i- r) V ]. A broad minimum in the ionic liquid cohesive energy is seen at a molar volume of 250 crrPnmr, which corresponds to an interionic separation of about 0.6nm, assuming face-centered cubic pacidng of anions about cations. The lowest Tg in the plot should probably be excluded from consideration because of the non-ideal Walden behavior for this IL (MOMNMgE BF ) [15]). The line through the points is a guide to the eye. The data for open triangles are from Sun, Forsyth, and MacFatlane [42].

The wet-web is only a little stronger than where it left the Fourdrinier wire. It is still held together principally by van der Waals forces, surface tension, liquid cohesion and adhesion, and by Ifictional forces between the entangled fibres. Surface tension in particular plays an important part in sheet formation, in drawing the fibres into close contact within the fibre network. A closed draw is desirable. 

Feed material Dilatant liquids, cohesive pastes, filter... 

The rising of a liquid against the pull of gravity through a narrow space, such as a thin tube, is called capillary action, or capillarity. Capillarity results from a competition between the intermolecular forces within the liquid (cohesive forces) and those between the liquid and the tube walls (adhesive forces). Let s look at the difference between the capillarities of water and mercury in glass ... 

Keywords Hydrophilicity Hydrophobicity Definitions Terminologies Oleophilicity Oleophobicity Superhydrophobicity Superoleophobicity Liquid cohesion Wetting interaction Amphiphobicity Omniphobicity... 

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