Surface modification by grafting of poly(SBMA-co-AEMA)-g-PDA coating and its application in CE
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In this paper, a novel copolymer consisting of sulfobetaine methacrylate (SBMA) and 2-aminoethyl methacrylate (AEMA) named as poly(SBMA-co-AEMA) was synthesized by conventional free-radical polymerization, the poly(SBMA-co-AEMA) zwitterionic copolymer was immobilized onto glass slides surface through polydopamine (PDA)-anchored coating and formed poly(SBMA-co-AEMA)-g-PDA coating. The defined copolymer was characterized by nuclear magnetic resonance hydrogen spectroscopy (1H NMR) and gel permeation chromatography. The surface morphology, thickness, and chemical component of poly(SBMA-co-AEMA)-g-PDA coating were studied by atom force microscope, ellipsometry, and X-ray photoelectron spectroscopy, respectively. The hydrophilicity and stability of these coatings were investigated by static water contact angles. And finally, the poly(SBMA-co-AEMA)-g-PDA coating was successfully applied into capillary inner surface for suppression electro-osmotic flow and protein separation by capillary electrophoresis.Keywords:
Atom-transfer radical-polymerization
Surface Modification
Gel permeation chromatography
Atom-transfer radical-polymerization
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Abstract Knowledge of contact angle hysteresis is important to the understanding of surface wettability and to controlling further surface wetting behaviour. The wettability can be affected by surface modification. This study is a look on surfaces modified by the usage of plasma. We describe the effect of plasma treatments on contact angle hysteresis by the use of Diffuse Coplanar Surface Dielectric Barrier Discharge (DCSBD). Modification of the surface was achieved using textile made from polyethylene terephthalate (PET). Results have shown that both advancing and receding contact angle were significantly reduced by the process. The contact angle hysteresis was decreased after the plasma treatment as was observed by measurement taken at various time intervals and this fact correspond with introduction of functional groups detected by X - ray photoelectron spectroscopy (XPS).
Hysteresis
Surface Modification
Plasma cleaning
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Atom-transfer radical-polymerization
Gel permeation chromatography
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When there is an interface between a liquid and a solid, the angle between the surface of the liquid and the baseline of the contact surface is described as the contact angle. The contact angle is a measure of the wettability of a solid by a liquid. Measurement of the contact angle helps in all situations where solids and liquids meet and there is benefit gained by control of wetting and adhesion properties. Applications where contact angle values are especially important include development of hydrophobic or hydrophilic surface coatings, paints and varnishes, cleaning agents, printing processes, and more. Contact angle goniometers are high-precision video camera-based devices which perform the optical analysis of the shape of liquid drops placed on a solid surface (sessile drop method) or the shape of drops that hang down from a dosing needle (pendant drop method). The drop shape helps in determination of different surface and interfacial parameters such as surface tension of a liquid, interfacial tension between two liquids, and surface energy of solid substrates. Contact angle hysteresis is an important physical phenomenon arising from chemical inhomogeneities, roughness, or impurities on a surface which can affect how a liquid droplet spreads across a surface. Contact angle hysteresis is the difference between advancing and receding contact angles and can be measured using the “needle-in method” or by tilting the actual contact angle goniometer or sample stage itself, allowing the droplet to roll across the surface of the substrate. This paper will describe recent advances in contact angle goniometry and will explain how surface tension, interfacial tension, and contact angle hysteresis measurements can be easily and accurately made using a modern contact angle goniometer and software.
Goniometer
Hysteresis
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Solid surface
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Solid surface
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Objective To reveal the wettability of hydrophilic silicone impression materials bydetecting static contact angle, dynamic contact angles and contact angle hysteresis. Methods 4 kinds of hydrophilic impression materials, which were AFFINIS MonoBody, ZEROSIL mono, Oranwash VL and HC, were studied, among which Oranwash VL was condensation silicone, while the others were addition silicone. Static contact angle was detected by means of sessile drop goniometry in the moment the water drop was released to the surface of materials, as well as 120 s later. Dynamic contact angles, including advancing contact angle and receding contact angle, were detected by means of tilting plate goniometry. And contact angle hysteresis was then calculated. Results Initial static contact angle of 4 silicone impression materials were all above 100°, while reducing to less than 90° 120 s later except Oranwash VL. Static contact angles of 4 materials in ascending order were: AFFINIS MonoBody, HC, ZEROSIL mono and Oranwash VL. And the order of dynamic contact angles were basically the same to that of static contact angle, except that the difference between HC and ZEROSIL mono was not significant. However, there were no significant differences among contact angle hysteresis of the 3 kinds of addition silicone impression materials, while that of Oranwash VL was significantly higher than the others. Conclusion There were differences in wettability among the selected hydrophilic silicone impressionmaterials, especially when it came to addition sili-cones and condensation silicones. And to evaluate wettability of impression materials properly, static contact angle, dynamic contact angle and contact angle hysteresis all should be considered, instead of detecting static contact angle only.
Impression
Goniometer
Hysteresis
Silicone rubber
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The environmental response of the fluorine-contanining amphoteric copolymer in water and air has been investigated. The polymers were coated on slide glass by spincoater. The surface composition was determined by Angle Resolved X-ray Photoelectron Spectroscopy(ARXPS). Sessile-drop and captive-bubble techniques were used for contact angle measurements. Advancing contact angle was increased by increment of fluorine content. Octane contact angle in water increased with decreasing advancing contact angle in air. Octane contact angle in water was strongly affected by dispersion term in surface free energy.
Fluorine
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