Pre-Adsorption of Amphiphilic Polymers on Synthetic Surfaces for Biofouling Retardation

2006 ◽  
Vol 11-12 ◽  
pp. 363-366 ◽  
Author(s):  
Xiao Nong Chen ◽  
Robert Pelton
Keyword(s):  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Amphiphilic Polymers ◽  
Hydrophilic Surfaces ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Before And After ◽  
Model Protein ◽  
Dual Polarisation Interferometry ◽  
Surface Morphologies

Polystyrene (PS), polyethylene (PE), polypropylene (PP), glass and stainless steel were exposed to aqueous solutions of a series amphiphilic polymers at room temperature, including N-isopropylacrylamide (NIPAM)-based polymers, polyvinylpyrrolidone (PVP), polypropylene oxide (PPO)-polyethylene oxide (PEO) block copolymers and PEO. Dynamic contact angle measurements of the material surfaces before and after the treatment indicate that only NIPAM-based polymers can adsorb on both hydrophobic and hydrophilic surfaces. The surface morphologies of the materials before and after polymer adsorption were investigated by profilometry. Protein adsorption on the surfaces pre-adsorbed NIPAM-based polymers was investigated by dual polarisation interferometry (DPI) and profilometry using lysozyme as the model protein. The results obtained indicate that NIPAM-based polymers can significantly improve the biofouling resistance of synthetic surfaces.

Amino acid adsorption on tetraphenyl porphyrin films

2020 ◽  
Vol 24 (04) ◽  
pp. 577-588 ◽  
Author(s):  
Jesus M. Rivera ◽  
Margarita Rivera
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Angle Measurements ◽  
Atomic Force ◽  
Tetraphenyl Porphyrin ◽  
Contact Angle Measurements ◽  
Before And After ◽  
Amino Acid Interaction

In this work, metal free, zinc and copper tetraphenyl porphyrin thin films were employed as substrates to study their interaction with glycine, serine, glutamate, lysine and argynine amino acids in order to investigate the effect of the metallic center and the amino acid characteristics in the adsorption phenomena. The amount of amino acid adsorbed on the films was quantified by using the Ruhemann method. Adsorption isotherms were obtained and analyzed in order to predict the adsorption mechanism for each case. In addition, the morphology of the films was investigated before and after the amino acid immersion by using scanning electron and atomic force microscopies. On the other hand, dynamic contact angle measurements were performed to monitor the spreading phenomena and changes in the hydrophobic nature of the surfaces after the amino acid interaction. From the results, it was observed that the largest deposited amino acid on all three surfaces corresponded to the positively charged compounds, while serine was the lowest adsorbed amino acid in all cases. These results can be attributed to electronic interactions between the amino acids’ lateral chains and the electronic [Formula: see text] distribution of the porphyrin macrocycle ring, and they provide important information regarding the amino acid selectivity of adsorption on tetraphenyl porphyrin films.

Dynamic contact angle measurements on superhydrophobic surfaces

2015 ◽  
Vol 27 (3) ◽  
pp. 032107 ◽  
Author(s):  
Jeong-Hyun Kim ◽  
H. Pirouz Kavehpour ◽  
Jonathan P. Rothstein
Keyword(s):  
Contact Angle ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Superhydrophobic Surfaces ◽  
Angle Measurements ◽  
Contact Angle Measurements

Initial bioadhesion on medical glass packaging materials investigated by dynamic contact angle measurements

2013 ◽  
Vol 210 (5) ◽  
pp. 983-987 ◽  
Author(s):  
Oliver Köhler ◽  
Christine Müller ◽  
Anne Hermsdörfer ◽  
Holger Röhl ◽  
Christiane Ziegler
Keyword(s):  
Contact Angle ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Packaging Materials ◽  
Angle Measurements ◽  
Contact Angle Measurements ◽  
Glass Packaging ◽  
Medical Glass

Measurements of the Contact Angles for Various Fluids Which Are Widely Used in the Oilfields to Improve Oil Recovery

2018 ◽  
Author(s):  
M. Elsharafi ◽  
K. Vidal ◽  
R. Thomas
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Interfacial Tension ◽  
Oil Recovery ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Contact Angles ◽  
Rock Face ◽  
Angle Measurements ◽  
Contact Angle Measurements

Contact angle measurements are important to determine surface and interfacial tension between solids and fluids. A ‘water-wet’ condition on the rock face is necessary in order to extract oil. In this research, the objectives are to determine the wettability (water-wet or oil-wet), analyze how different brine concentrations will affect the wettability, and study the effect of the temperature on the dynamic contact angle measurements. This will be carried out by using the Cahn Dynamic Contact Angle. Analyzer DCA 315 to measure the contact angle between different fluids such as surfactant, alkaline, and mineral oil. This instrument is also used to measure the surface properties such as surface tension, contact angle, and interfacial tension of solid and liquid samples by using the Wilhelmy technique. The work used different surfactant and oil mixed with different alkaline concentrations. Varying alkaline concentrations from 20ml to 1ml were used, whilst keeping the surfactant concentration constant at 50ml.. It was observed that contact angle measurements and surface tension increase with increased alkaline concentrations. Therefore, we can deduce that they are directly proportional. We noticed that changing certain values on the software affected our results. It was found that after calculating the density and inputting it into the CAHN software, more accurate readings for the surface tension were obtained. We anticipate that the surfactant and alkaline can change the surface tension of the solid surface. In our research, surfactant is desirable as it maintains a high surface tension even when alkaline percentage is increased.

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