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Pelipenko, Jan; Kristl, Julijana; Rošic, Romana; Baumgartner, Saša; Kocbek, Petra
Acta pharmaceutica (Zagreb, Croatia), 06/2012, Volume: 62, Issue: 2Journal Article
Interfacial rheological properties have yet to be thoroughly explored. Only recently, methods have been introduced that provide sufficient sensitivity to reliably determine viscoelastic interfacial properties. In general, interfacial rheology describes the relationship between the deformation of an interface and the stresses exerted on it. Due to the variety in deformations of the interfacial layer (shear and expansions or compressions), the field of interfacial rheology is divided into the subcategories of shear and dilatational rheology. While shear rheology is primarily linked to the long-term stability of dispersions, dilatational rheology provides information regarding short-term stability. Interfacial rheological characteristics become relevant in systems with large interfacial areas, such as emulsions and foams, and in processes that lead to a large increase in the interfacial area, such as electrospinning of nanofibers. Medfazne reološke lastnosti so še dokaj neraziskane. Šele pred kratkim so razvili metode, s katerimi je mogoče z zadostno občutljivostjo in natančnostjo določiti viskoelastične lastnosti medfaze. Medfazna reologija opisuje odnos med deformacijo medfaze in silo, ki to deformacijo povzroči. Zaradi različnih deformacij medfazne plasti (strig in raztezanje, oziroma krčenje) se tudi medfazna reologija deli na strižno in dilatacijsko. Strižne reološke lastnosti medfaze se odražajo v dolgotrajni stabilnosti disperzij, medtem ko sedilatacijske predvsem v kratkotrajni stabilnosti. Poznavanje medfaznih reoloških lastnosti je pomembno v sistemih z velikimi medfaznimi površinami, kot so emulzije in pene ter pri procesih, kjer pride do velikega povečanja medfazne površine, kot je elektrostatsko sukanje nanovlaken.
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