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.

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.

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

Improvement of Hydrophilic Stability of Diamond-Like Carbon Films by O2/CF4 Plasma Post-Treatment

2015 ◽  
Vol 1125 ◽  
pp. 38-44
Author(s):  
Chavin Jongwannasiri ◽  
Shuichi Watanabe
Keyword(s):  
Carbon Films ◽  
Post Treatment ◽  
Attenuated Total Reflectance ◽  
Diamond Like Carbon ◽  
Total Reflectance ◽  
Force Microscopy ◽  
Angle Measurements ◽  
Atomic Force ◽  
Contact Angle Measurements ◽  
Before And After

In this article, the results obtained from a study carried out on the plasma post-treatment of diamond-like carbon (DLC) films using an oxygen/tetrafluoromethane (O2/CF4) gas mixture is reported. The surface morphology and chemical bonding of the films before and after the plasma post-treatment were characterized using atomic force microscopy (AFM) and attenuated total reflectance-Fourier transform infrared (ATR-FTIR) spectroscopy. The effect of adding CF4 to the O2 plasma on the wettability of the films was also examined using contact angle measurements. The results indicate that the surface roughness increased with the addition of CF4 to the O2 plasma, whereas oxygen-and fluorinated-based functional groups were generated on the surface of the DLC films submitted to O2/CF4 plasma post-treatment. The surface energy also decreased with increasing CF4 fraction, causing the surface of the films to be hydrophobic. Furthermore, the films containing 20% CF4 exhibited higher hydrophilic stability than the others. Thus, the addition of a small amount of CF4 to O2 plasma can be considered beneficial in improving the hydrophilic stability of surface of DLC films.

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
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