scholarly journals Vascular Polyurethane Prostheses Modified with a Bioactive Coating—Physicochemical, Mechanical and Biological Properties

2021 ◽  
Vol 22 (22) ◽  
pp. 12183
Author(s):  
Aleksandra Kuźmińska ◽  
Aleksandra Wojciechowska ◽  
Beata A. Butruk-Raszeja
Keyword(s):  
Small Diameter ◽  
Biological Properties ◽  
Inversion Method ◽  
Water Contact ◽  
Vascular Prostheses ◽  
Bioactive Coating ◽  
Modification Process ◽  
Modified Surfaces ◽  
Peptide Coatings ◽  
Phase Inversion Method

This study describes a method for the modification of polyurethane small-diameter (5 mm) vascular prostheses obtained with the phase inversion method. The modification process involves two steps: the introduction of a linker (acrylic acid) and a peptide (REDV and YIGSR). FTIR and XPS analysis confirmed the process of chemical modification. The obtained prostheses had a porosity of approx. 60%, Young’s Modulus in the range of 9–11 MPa, and a water contact angle around 40°. Endothelial (EC) and smooth muscle (SMC) cell co-culture showed that the surfaces modified with peptides increase the adhesion of ECs. At the same time, SMCs adhesion was low both on unmodified and peptide-modified surfaces. Analysis of blood-materials interaction showed high hemocompatibility of obtained materials. The whole blood clotting time assay showed differences in the amount of free hemoglobin present in blood contacted with different materials. It can be concluded that the peptide coating increased the hemocompatibility of the surface by increasing ECs adhesion and, at the same time, decreasing platelet adhesion. When comparing both types of peptide coatings, more promising results were obtained for the surfaces coated with the YISGR than REDV-coated prostheses.

Preparation of Hydrophilic and Antifouling PVC/PAN Hollow fiber Membrane

2011 ◽  
Vol 332-334 ◽  
pp. 1764-1768 ◽  
Author(s):  
Wei Shu ◽  
Chang Fa Xiao ◽  
Xiao Yu Hu ◽  
Shuo Mei
Keyword(s):  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Solution Concentration ◽  
Surface Characteristic ◽  
Attenuated Total Reflection ◽  
Inversion Method ◽  
Fiber Membrane ◽  
Water Contact ◽  
Naoh Solution ◽  
Phase Inversion Method

Poly (vinyl chloride) /poly (acrylonitrile) (PVC/PAN) hollow fiber membrane was prepared by phase inversion method and it was hydrolyzed in different NaOH solution concentration. After hydrolysis modified, the change of surface characteristic of the PVC/PAN hollow fiber membrane was described by Fourier transform infrared attenuated total reflection spectroscopy (FTIR-ATR) and water contact angle. Morphological structures of membranes were observed by field-emission scanning electron microscope (FESEM). Protein filtration was employed to evaluate the antifouling performance of the membrane. All these results demonstrated that PVC/PAN hollow fiber membrane modified by hydrolysis showed high permeation flux, good hydrophilicity and antifouling.

Effect of PVP Hydrophilic Additive on the Morphology and Properties of PVDF Porous Membranes

2014 ◽  
Vol 981 ◽  
pp. 891-894 ◽  
Author(s):  
Yun Wei Guo ◽  
Wei Wei Cui ◽  
Wen Hua Xu ◽  
Yang Jiang ◽  
Hui Hui Liu ◽  
...  
Keyword(s):  
Vinylidene Fluoride ◽  
Pure Water ◽  
Water Flux ◽  
Porous Membrane ◽  
Porous Membranes ◽  
Inversion Method ◽  
Water Contact ◽  
Poly Vinylidene Fluoride ◽  
Pure Water Flux ◽  
Phase Inversion Method

This work describes the preparation and the properties of poly(vinylidene fluoride) (PVDF) porous membranes. The porous membrane was prepared using phase-inversion method by adding hydrophilic polyvinylpyrrolidone (PVP) as hole-agent. The contrastive analysis of membrane characterizations between the membrane no PVP added and the membrane added PVP were carried out by optical microscopy analysis, scanning electron microscopy, porosity, pure water flux and water contact angle. The results showed that adding PVP can induce the building of pore structure, increase the surface roughness and hydrophilicity of PVDF membrane, and then enhance its pure water flux.

Effective elongation properties of cellulose–natural rubber composite hydrogels having interconnected domain

2019 ◽  
Vol 52 (4) ◽  
pp. 337-355
Author(s):  
Nuttida Srirachya ◽  
Kanoktip Boonkerd ◽  
Takaomi Kobayashi
Keyword(s):  
Natural Rubber ◽  
Elastic Properties ◽  
Inversion Method ◽  
Sem Images ◽  
Water Contact ◽  
Composite Hydrogels ◽  
Original Length ◽  
Cellulose Hydrogel ◽  
Wet Phase Inversion ◽  
Phase Inversion Method

This report describes progress in the development of cellulose hydrogel by blending with natural rubber (NR). Cellulose regenerated from the bagasse sugarcane was used for this study. Although cellulose and NR have a considerably low mutual affinity, composite hydrogels with various cellulose and NR contents were prepared using a wet-phase inversion method. The maximum amount of NR that can be loaded into the cellulose hydrogel was about 30% vol. Once NR is introduced into the cellulose hydrogels, the obtained hydrogel became translucent and eventually opaque with increasing NR loading. Measurements of water absorption, the water contact angle, and evaluation of fourier-transform infrared spectroscopoy (FTIR) spectra revealed that the presence of NR decreases the water affinity of the hydrogels. Nevertheless, it is noteworthy that the composite hydrogels had higher tensile strength and better elastic properties than the pristine hydrogel. The results showed that the obtained composite hydrogels can be elongated several times to their original length. The enhancement of both properties was proportional to the amount of NR included. Results of scanning electron microscope (SEM) images showed NR present inside the hollow of the cellulose hydrogel, forming interconnected domains. One can infer that the increase of mechanical and elastic properties is attributable to the presence of these interconnected structures.

Preparation and Characterization of PVDF Hydrophobic Membrane

2011 ◽  
Vol 221 ◽  
pp. 338-342 ◽  
Author(s):  
Hua Feng Zhang ◽  
Yu Zhong Zhang ◽  
Li Gang Lin ◽  
Xiao Li Ding ◽  
Hong Li
Keyword(s):  
Surface Roughness ◽  
Contact Angle ◽  
Polyvinylidene Fluoride ◽  
Membrane Surface ◽  
Inversion Method ◽  
Hydrophobic Membrane ◽  
Water Contact ◽  
Dry Process ◽  
Phase Inversion Method

Polyvinylidene fluoride (PVDF) hydrophobic membrane has been prepared by phase inversion method. The effects of concentration of PVDF, different processes of preparations, and different surface roughness on hydrophobic capability of membrane surface (water contact angle, WCA) have been investigated. The results showed that, hydrophobic ability of PVDF membranes decreased with the increasing concentration of PVDF. WCA of membrane prepared by was increasing. Membrane surface hydrophobic ability increased with the increasing surface roughness. The contact angle of membrane comes to 141° with dry process and 10% PVDF concentration.

scholarly journals Polysulfone Membranes Embedded with Halloysites Nanotubes: Preparation and Properties

Membranes ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 2 ◽  
Author(s):  
Nagla Kamal ◽  
Viktor Kochkodan ◽  
Atef Zekri ◽  
Said Ahzi
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Water Flux ◽  
Total Porosity ◽  
Composite Membranes ◽  
Mechanical Analysis ◽  
Inversion Method ◽  
Water Contact ◽  
X Ray ◽  
Phase Inversion Method

In the present study, nanocomposite ultrafiltration membranes were prepared by incorporating nanotubes clay halloysite (HNTs) into polysulfone (PSF) and PSF/polyvinylpyrrolidone (PVP) dope solutions followed by membrane casting using phase inversion method. Characterization of HNTs were conducted using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), and thermogravimetric (TGA) analysis. The pore structure, morphology, hydrophilicity and mechanical properties of the composite membranes were characterized by using SEM, water contact angle (WCA) measurements, and dynamic mechanical analysis. It was shown that the incorporation of HNTs enhanced hydrophilicity and mechanical properties of the prepared PSF membranes. Compared to the pristine PSF membrane, results show that the total porosity and pore size of PSF/HNTs composite membranes increased when HNTs loadings were more than 0.5 wt % and 1.0 wt %, respectively. These findings correlate well with changes in water flux of the prepared membranes. It was observed that HNTs were homogenously dispersed within the PSF membrane matrix at HNTs content of 0.1 to 0.5 wt % and the PSF/HNTs membranes prepared by incorporating 0.2 wt % HNTs loading possess the optimal mechanical properties in terms of elastic modulus and yield stress. In the case of the PSF/PVP matrix, the optimal mechanical properties were obtained with 0.3 wt % of HNTs because PVP enhances the HNTs distribution. Results of bovine serum albumin (BSA) filtration tests indicated that PSF/0.2 wt % HNTs membrane exhibited high BSA rejection and notable anti-fouling properties.

A straight, open and macro-porous fuel electrode-supported protonic ceramic electrochemical cell

2021 ◽  
Author(s):  
Yuxin Pan ◽  
Kai Pei ◽  
Yucun Zhou ◽  
Tong Liu ◽  
Meilin Liu ◽  
...  
Keyword(s):  
Phase Inversion ◽  
Electrochemical Cell ◽  
Inversion Method ◽  
Phase Inversion Method

A straight, open and macro-porous Ni–BaZr0.1Ce0.7Y0.1Yb0.1O3 fuel electrode-supported protonic ceramic electrochemical cell has been fabricated by a modified phase-inversion method.

Sign in / Sign up

Export Citation Format

Share Document