scholarly journals Dynamic Contact Angle Analysis of Protein Adsorption on Polysaccharide Multilayer’s Films for Biomaterial Reendothelialization

2014 ◽  
Vol 2014 ◽  
pp. 1-10 ◽  
Author(s):  
Safiya Benni ◽  
Thierry Avramoglou ◽  
Hanna Hlawaty ◽  
Laurence Mora
Keyword(s):  
Contact Angle ◽  
Endothelial Cell ◽  
Protein Adsorption ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Force Microscopy ◽  
Atomic Force ◽  
Endothelial Cell Response ◽  
Adsorption Desorption ◽  
Contact Angle Analysis

Atherosclerosis is a major cardiovascular disease. One of the side effects is restenosis. The aim of this work was to study the coating of stents by dextran derivates based polyelectrolyte’s multilayer (PEM) films in order to increase endothelialization of injured arterial wall after stent implantation. Films were composed with diethylaminoethyl dextran (DEAE) as polycation and dextran sulphate (DS) as polyanion. One film was composed with 4 bilayers of (DEAE-DS)4and was labeled D−. The other film was the same as D− but with an added terminal layer of DEAE polycation: (DEAE-DS)4-DEAE (labeled D+). The dynamic adsorption/desorption of proteins on the films were characterized by dynamic contact angle (DCA) and atomic force microscopy (AFM). Human endothelial cell (HUVEC) adhesion and proliferation were quantified and correlated to protein adsorption analyzed by DCA for fibronectin, vitronectin, and bovine serum albumin (BSA). Our results showed that the endothelial cell response was optimal for films composed of DS as external layer. Fibronectin was found to be the only protein to exhibit a reversible change in conformation after desorption test. This behavior was only observed for (DEAE-DS)4films. (DEAE-DS)4films could enhance HUVEC proliferation in agreement with fibronectin ability to easily change from conformation.

The influence of proteins on calcium phosphate deposition over titanium implants studied by dynamic contact angle analysis and XPS

1997 ◽  
Vol 10 (2) ◽  
pp. 95-104 ◽  
Author(s):  
Ana Paula Valagão Amadeu do Serro ◽  
Anabela Catarino Fernandes ◽  
Benilde de Jesus ◽  
Vieira Saramago
Keyword(s):  
Contact Angle ◽  
Calcium Phosphate ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Titanium Implants ◽  
Contact Angle Analysis

scholarly journals Interpretation of Hydrophobization Behavior of Dodecylamine on Muscovite and Talc Surface through Dynamic Wettability and AFM Analysis

Minerals ◽  
2018 ◽  
Vol 8 (9) ◽  
pp. 391 ◽  
Author(s):  
Hao Jiang ◽  
Ya Gao ◽  
Sultan Khoso ◽  
Wanying Ji ◽  
Yuehua Hu
Keyword(s):  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Contact Angles ◽  
Interaction Forces ◽  
Force Microscopy ◽  
Adsorbed Amount ◽  
Atomic Force ◽  
Imaging Results ◽  
Afm Imaging ◽  
Afm Analysis

In this study, a new approach, “dynamic wettability”, and atomic force microscopy (AFM) imaging analysis techniques were successfully used to characterize the hydrophobization mechanism of the collector dodecylamine (DDA) on muscovite and talc surfaces. The attachment of bubbles to the minerals was studied through the dynamic contact angle to gain a detailed understanding of the hydrophobization mechanism of DDA on a muscovite and talc surface. AFM imaging and interaction forces were performed to explain the DDA adsorption mechanism on both minerals. Finally, flotation tests were performed to verify the effectiveness of these techniques. After treatments with DDA, the contact angles became much larger compared to initial angles, particularly for muscovite, and the attachment of bubbles on the talc surface was much easier than muscovite due to its natural hydrophobicity. From AFM imaging, both the muscovite and talc showed a similar tendency; the higher the DDA concentration, the more the adsorbed amount. However, the adsorbed amount of DDA on talc surface was obviously more than that on muscovite. As far as interaction forces are concerned, the maximum attractions occurred at certain different concentrations respectively for muscovite and talc and agreed well with the AFM-imaging results. Moreover, results obtained from flotation tests were promising and quite in agreement with the phenomenon of these techniques.

Effect of Plasticizer of Sizing Agent on the Surface of Carbon Fibers and Interface of its Composites

2011 ◽  
Vol 337 ◽  
pp. 10-15 ◽  
Author(s):  
Huan Xia Zhang ◽  
Amin Cao ◽  
Yong Kang Luo ◽  
Li Wei
Keyword(s):  
Contact Angle ◽  
Carbon Fibers ◽  
Photoelectron Spectroscopy ◽  
Interfacial Shear Strength ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Interfacial Shear ◽  
X Ray ◽  
Physical Changes ◽  
Contact Angle Analysis

In this work, carbon fibers were sized with different plasticizer of sizing agent in order to improve the performances of carbon fibers and the interface of carbon fibers composites. The chemical and physical changes induced by the treatments on carbon fibers surface are examined using dynamic contact angle analysis test(DCAT) , X-ray photoelectron spectroscopy (XPS). The interfacial shear strength (IFSS) of CF/EP composites are analysised by micro-droplet test. At the same time, the wear resistance was also studied in order to understand the effect of the plasticizer of sizing agent on the carbon fibers. The study shows that the 3# sized carbon fiber has the better wetting and surface energy. XPS results reveal that the 3# samples show a significant increase in oxygen-containing groups, such as–C–OH, -COOH, -C–O–C- and -COOR. 3#sizing agent also show better interface adhesion between fibers and matrix and has better wear resistant properties.

Hydrosilation-Cured Poly(dimethylsiloxane) Networks:  Intrinsic Contact Angles via Dynamic Contact Angle Analysis

2003 ◽  
Vol 36 (10) ◽  
pp. 3689-3694 ◽  
Author(s):  
Janelle M. Uilk ◽  
Ann E. Mera ◽  
Robert B. Fox ◽  
Kenneth J. Wynne
Keyword(s):  
Contact Angle ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Contact Angles ◽  
Contact Angle Analysis

Improved interfacial and impact properties of carbon fiber/epoxy composites through grafting hyperbranched polyglycerols on a carbon fiber surface

e-Polymers ◽  
2014 ◽  
Vol 14 (2) ◽  
pp. 145-150 ◽  
Author(s):  
Kaiqiang Sui ◽  
Qingbo Zhang ◽  
Yingying Liu ◽  
Lei Tan ◽  
Li Liu
Keyword(s):  
Contact Angle ◽  
Shear Strength ◽  
Carbon Fiber ◽  
Carbon Fibers ◽  
Dynamic Contact Angle ◽  
Fiber Surface ◽  
Dynamic Contact ◽  
Impact Properties ◽  
Carbon Fiber Surface ◽  
Contact Angle Analysis

AbstractGrafting hyperbranched polyglycerols onto a carbon fiber surface is done in an attempt to improve the interfacial and impact properties between carbon fiber and epoxy resin. Scanning electron microscopy (SEM), thermal gravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS) and dynamic contact angle analysis were performed to characterize the carbon fibers. The TGA result shows that the mass fraction of the hyperbranched polyglycerols grafted onto the carbon fibers surface was 9.03%. The SEM results indicate that the hyperbranched polyglycerols have been grafted onto the carbon surface and that the surface roughness of the carbon fiber significantly increased. The XPS result indicates that oxygen-containing functional groups obviously increased after modification. Dynamic contact angle analysis indicates that the surface energy of modified carbon fibers increased significantly compared with the untreated ones. Results of the mechanical property tests show that interfacial shear strength increased from 59.86 to 80.16 MPa, interlaminar shear strength increased from 57.57 to 73.49 MPa and impact strength simultaneously increased from 2.52 to 3.52 J.

Dynamic Contact Angle Analysis of Silicone Hydrogel Contact Lenses

2010 ◽  
Vol 26 (1) ◽  
pp. 85-99 ◽  
Author(s):  
Michael Leonard Read ◽  
Philip Bruce Morgan ◽  
Jeremiah Michael Kelly ◽  
Carole Maldonado-Codina
Keyword(s):  
Contact Angle ◽  
Contact Lenses ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Silicone Hydrogel ◽  
Contact Angle Analysis

Chemical Functionalization of Water-etched Si(100)

2009 ◽  
Vol 1228 ◽  
Author(s):  
Carmen Say ◽  
Kate T. Queeney
Keyword(s):  
Hydrofluoric Acid ◽  
Room Temperature ◽  
Dynamic Contact Angle ◽  
Dynamic Contact ◽  
Silicon Hydride ◽  
Ambient Conditions ◽  
Organic Layers ◽  
Force Microscopy ◽  
Atomic Force ◽  
Nanoscale Topography

AbstractEtching of hydrogen-terminated Si(100) in deoxygenated water produces surfaces with a regular nanoscale topography. Surface infrared spectroscopy provides detailed information about this topography via interrogation of the silicon hydride species that populate this highly ordered surface. Here we investigate the feasibility of using siloxane chemistry to functionalize this surface while preserving the initial topography. The critical step in silanization to form high-quality organic layers is oxidative cleaning of the surface. By re-etching oxidized surfaces in hydrofluoric acid, we can repopulate surface hydride species and examine any apparent changes in topography that resulted from the oxidation step. We compare three different oxidation protocols and find that an SC-2 clean results in the least perturbation of the original topography. Preliminary results using both dynamic contact angle and atomic force microscopy suggest that the SC-2 oxidized surface can be functionalized with alkylsilane reagents to create a functionalized surface with regular, nanoscale topography, with all surface processing carried out under ambient conditions at or near room temperature.

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