Surface modification of PVDF membrane by sulfonated chitosan for enhanced anti-fouling property via PDA coating layer

2022 ◽  
Vol 307 ◽  
pp. 130981
Author(s):  
Jian Ren ◽  
Weiwei Xia ◽  
Xia Feng ◽  
Yiping Zhao
Keyword(s):  
Surface Modification ◽  
Coating Layer ◽  
Pvdf Membrane

scholarly journals Polydopamine-Assisted Surface Modification for Bone Biosubstitutes

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Shishu Huang ◽  
Nuanyi Liang ◽  
Yang Hu ◽  
Xin Zhou ◽  
Noureddine Abidi
Keyword(s):  
Tissue Engineering ◽  
Surface Modification ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Coating Layer ◽  
Tissue Scaffolds ◽  
Surface Modifier ◽  
Biomaterial Surface ◽  
Superior Surface ◽  
Unique Surface

Polydopamine (PDA) prepared in the form of a layer of polymerized dopamine (DA) in a weak alkaline solution has been used as a versatile biomimetic surface modifier as well as a broadly used immobilizing macromolecule. This review mainly discusses the progress of biomaterial surface modification inspired by the participation of PDA in bone tissue engineering. A comparison between PDA-assisted coating techniques and traditional surface modification applied to bone tissue engineering is first presented. Secondly, the chemical composition and the underlying formation mechanism of PDA coating layer as a unique surface modifier are interpreted and discussed. Furthermore, several typical examples are provided to evidence the importance of PDA-assisted coating techniques in the construction of bone biosubstitutes and the improvement of material biocompatibility. Nowadays, the application of PDA as a superior surface modifier in multifunctional biomaterials is drawing tremendous interests in bone tissue scaffolds to promote the osteointegration for bone regeneration.

Study on Die Surface Coating by Electric Discharging Machining

2012 ◽  
Vol 490-495 ◽  
pp. 2619-2623 ◽  
Author(s):  
Xiao Hai Li ◽  
De Cheng Wang ◽  
Yu Fang
Keyword(s):  
Surface Modification ◽  
Power Supply ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Coating Layer ◽  
Pulse Power ◽  
Working Fluid ◽  
Pulse Power Supply ◽  
Die Surface ◽  
New Type

A new method of die surface modification by ordinary Electrical Discharge Machining (EDM) is described. First, the surface modification mechanism by EDM is studied, which is different with ordinary EDM. Secondly, the influence of important electric parameters on the effect of electric discharging coating in working fluid is analyzed, which is helpful to improve the coating layer. At last, the new type special pulse power supply with additional pulse current is designed. The special pulse power supply for electrical discharge coating behaves well, and the compacted coating layer without cracks deposited on the surface of die by EDM can be obtained, which can prolong the life of die

scholarly journals Surface Modification of PVDF Membranes for Treating Produced Waters by Direct Contact Membrane Distillation

2019 ◽  
Vol 16 (5) ◽  
pp. 685 ◽  
Author(s):  
Mohanad Kamaz ◽  
Arijit Sengupta ◽  
Ashley Gutierrez ◽  
Yu-Hsuan Chiao ◽  
Ranil Wickramasinghe
Keyword(s):  
Surface Modification ◽  
Surface Properties ◽  
Direct Contact ◽  
Produced Water ◽  
Surface Oxidation ◽  
Membrane Distillation ◽  
Mineral Salts ◽  
Microscopy Imaging ◽  
Pvdf Membrane ◽  
Direct Contact Membrane Distillation

Direct contact membrane distillation (DCMD) has been conducted to treat hydraulic fracturing-produced water using polyvinylidenedifluoride (PVDF) membranes. Tailoring the surface properties of the membrane is critical in order to reduce the rate of adsorption of dissolved organic species as well as mineral salts. The PVDF membranes have been modified by grafting zwitterion and polyionic liquid-based polymer chains. In addition, surface oxidation of the PVDF membrane has been conducted using KMnO4 and NaOH. Surface modification conditions were chosen in order to minimize the decrease in contact angle. Thus, the membranes remain hydrophobic, essential for suppression of wetting. DCMD was conducted using the base PVDF membrane as well as modified membranes. In addition, DCMD was conducted on the base membrane using produced water (PW) that was pretreated by electrocoagulation to remove dissolved organic compounds. After DCMD all membranes were analyzed by scanning electron microscopy imaging as well as Energy-Dispersive X-Ray spectroscopy. Surface modification led to a greater volume of PW being treated by the membrane prior to drastic flux decline. The results indicate that tailoring the surface properties of the membrane enhances fouling resistance and could reduce pretreatment requirements.

Surface modification of a PVDF membrane by cross-linked collagen

RSC Advances ◽  
2014 ◽  
Vol 4 (109) ◽  
pp. 63989-63996 ◽  
Author(s):  
Lishun Wu ◽  
Junfen Sun ◽  
Faqin Tong
Keyword(s):  
Surface Modification ◽  
Plasma Treatment ◽  
Pvdf Membrane

PVDF membrane was modified by grafting cross-linked collagen after plasma treatment. The modified PVDF membrane has high OD value compared to original PVDF membrane, which means modified PVDF membrane has good hydrophilicity and biocompatibility.

Oxygen Permeability of Ba0.5Sr0.5Co0.8Fe0.2O5+δMembrane after Surface Modification

2013 ◽  
Vol 275-277 ◽  
pp. 2394-2397
Author(s):  
Zi Gang Shen ◽  
Dong Li
Keyword(s):  
Surface Modification ◽  
Thin Layer ◽  
Oxygen Permeability ◽  
Coating Layer ◽  
Oxygen Permeation

The oxygen permeation fluxes of Ba0.5Sr0.5Co0.8Fe0.2O5+(BSCF) membranes coated by RBaCo2O5+ (R= Pr, Nd, Sm, Gd) thin layer were investigated. The oxygen permeation fluxes of BSCF membranes with RBaCo2O5+ (R112)R112 coating layer can be enhanced remarkably. And it is found that the reaction of R112 with BSCF also have effect on the oxygen permeation fluxes. Impurity formed by the reaction of Pr112 with BSCF block oxygen permeation. While NdBaCo2O5+ and SmBaCo2O5+, especially GdBaCo2O5+ have no serious reaction with BSCF, they are desirable materials for coating layer of oxygen permeation membranes.

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