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By combining a previously developed model of droplet spreading with simple equations to describe liquid penetration, a versatile new model was developed that successfully describes the spreading and imbibition of liquid droplets on porous surfaces.The model is exptl. verified for a range of porous membranes and should be of particular relevance to the interaction of ink-jet droplets with porous receivers such as paper.

01 Jan 1998·Analytical Communications

The isolation and identification of dyes in aqueous media by solid phase extraction-Fourier transform-Raman spectroscopy (SPERS)†

Author: Courbariaux, Yann ; Bristow, Anthony W. T. ; Sewell, Catherine ; Strawn, Alan W.

The isolation of photog. dyes in aqueous solution by solid phase extraction (SPE) and identification by FT-Raman spectroscopy is reported.A series of dyes was studied using anion exchange (quaternary amine) and aminopropyl SPE cartridges and disks.Dye identification was possible by comparison of Raman spectra recorded from the SPE cartridges and disks, with a spectral library generated from the corporate reference materials.The determination of an unknown dye in an aqueous effluent stream is described as an application of the technique.

01 Apr 1997·Langmuir

Contact Angle Relaxation during Droplet Spreading: Comparison between Molecular Kinetic Theory and Molecular Dynamics

Author: Clarke, A. ; Blake, T. D. ; De Coninck, J. ; de Ruijter, M. J.

The macroscopic behavior of the contact line during the spontaneous spreading of a droplet can be described in terms of microscopic quantities, specifically the substrate-liquid and liquid-liquid interactions.Here, for the first time, the results of mol. dynamics simulations of very large sessile drop systems are compared with the predictions of the mol.-kinetic theory of wetting.Good agreement is obtained, with both approaches yielding a consistent set of mol. parameters and macroscopic behavior which is consistent with experiments

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