Topic
Sessile drop technique
About: Sessile drop technique is a research topic. Over the lifetime, 2827 publications have been published within this topic receiving 68943 citations.
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TL;DR: The results show that fewer plasma proteins and a smaller HFG/HSA ratio adsorb on the ZnO thin films' surface.
Abstract: In this paper, the adsorption behavior of plasma proteins on the surface of ZnO thin films prepared by radio frequency (RF) sputtering under different sputtering powers was studied. The microstructures and surface properties of the ZnO thin films were investigated by x-ray diffraction (XRD), scanning electron microscopy (SEM), UV–visible optical absorption spectroscopy and contact angle techniques. The results show that the ZnO thin films have better orientation of the (0 0 2) peak with increasing RF power, especially at around 160 W, and the optical band gap of the ZnO films varies from 3.2 to 3.4 eV. The contact angle test carried out by the sessile drop technique denoted a hydrophobic surface of the ZnO films, and the surface energy and adhesive work of the ZnO thin films decreased with increasing sputtering power. The amounts of human fibrinogen (HFG) and human serum albumin (HSA) adsorbing on the ZnO films and reference samples were determined by using enzyme-linked immunosorbent assay (ELISA). The results show that fewer plasma proteins and a smaller HFG/HSA ratio adsorb on the ZnO thin films' surface.
23 citations
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23 citations
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TL;DR: A model based on the temperature shift concept is proposed which allows the calculation of the contact angle of molten polymers on steel for different temperatures directly from shear viscosity data.
Abstract: It is of great importance for polymer processing whether and how viscosity influences the wettability of tool surfaces. We demonstrate the existence of a distinct relationship between the contact angle of molten polymers and zero shear viscosity in this paper. The contact angle of molten polypropylene and polymethylmethacrylate on polished steel was studied in a high temperature chamber using the sessile drop method. A high pressure capillary rheometer with a slit die was employed to determine the shear viscosity curves in a low shear rate range. A linear relation between the contact angle and zero shear viscosity was obtained. Furthermore, the contact angle and the zero shear viscosity values of the different polymers were combined to one function. It is revealed that, for the wetting of tool surfaces by molten polymers, a lower viscosity is advantageous. Furthermore, a model based on the temperature shift concept is proposed which allows the calculation of the contact angle of molten polymers on steel for different temperatures directly from shear viscosity data.
23 citations
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TL;DR: In this article, the nature of the bonding between metals and ceramics, with emphasis on ionocovalent oxide ceramic, is discussed using an electronic approach, and the general behavior of wetting and adhesion in metal/ceramic systems could be deduced.
Abstract: The current understanding of metal-ceramic interactions is presented based on wetting data obtained by the sessile drop technique. The nature of the bonding between metals and ceramics, with emphasis on ionocovalent oxide ceramics, is discussed using an electronic approach. Typical examples are given to illustrate the effect of oxygen on the wetting behaviour of a metal/ceramic system when it acts as a dissolved element in the liquid metal, and when it causes the formation of an oxide film on the metal surface and an oxide-like layer on the ceramic surface. The influence of alloying elements on the wetting properties is elucidated using a thermodynamic model. Following these discussions, the general behaviour of wetting and adhesion in metal/ceramic systems could thus be deduced.
23 citations
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TL;DR: In this paper, high-pressure X-ray radiography and micro-tomography measurements were made to determine the interfacial tension between liquid iron alloys and silicate melt using the sessile drop method.
23 citations