The effects of processing conditions on the surface morphology and hydrophobicity of polyvinylidene fluoride membranes prepared via vapor-induced phase separation

2012 ◽  
Vol 263 ◽  
pp. 737-744 ◽  
Author(s):  
Yuelian Peng ◽  
Hongwei Fan ◽  
Ju Ge ◽  
Shaobin Wang ◽  
Ping Chen ◽  
...  
Keyword(s):  
Phase Separation ◽  
Surface Morphology ◽  
Polyvinylidene Fluoride ◽  
Processing Conditions

scholarly journals Effect of TiO2 Powder on the Surface Morphology of Micro/Nanoporous Structured Hydrophobic Fluoropolymer Based Composite Material

2013 ◽  
Vol 2013 ◽  
pp. 1-4 ◽  
Author(s):  
Bichitra Nanda Sahoo ◽  
Balasubramanian Kandasubramanian ◽  
Amrutha Thomas
Keyword(s):  
Phase Separation ◽  
Surface Morphology ◽  
Polymer Composite ◽  
Polyvinylidene Fluoride ◽  
Industrial Applications ◽  
Nanoporous Structure ◽  
Hydrophobic Surfaces ◽  
Water Contact ◽  
Maximum Water ◽  
The Impact

The present work reports a simple and effective way to produce hydrophobic foams with polyvinylidene fluoride (PVDF) and TiO2 by using a phase separation technique. This method involved the phase separation during the deposition of PVDF from its DMF solution with nonsolvent water in the presence of TiO2. The surface morphology of hydrophobic surfaces was characterized by Field Emission Scanning Electron Microscope (FESEM). The maximum water contact angle of 129° was observed. The results confirm that the surface texture of polymer composite exhibits mixture of microporous and nanoporous structure. The impact of TiO2 on the wettability property of polymer composite has been studied. The proposed methodology might find applications in the preparation of hydrophobic surfaces for industrial applications.

scholarly journals Fabrication and Characterization of PVDF with an Additive of Nanozeolite via Electrospinning and Non-solvent Induced Phase Separation (NIPS) Process

2020 ◽  
Vol 319 ◽  
pp. 10002
Author(s):  
Hindun Nofitri Da Conceicao Isya ◽  
Imelda Valadares Marcal ◽  
Ruth R. Aquino
Keyword(s):  
Contact Angle ◽  
Tensile Strength ◽  
Phase Separation ◽  
Surface Morphology ◽  
Polyvinylidene Fluoride ◽  
Testing Machine ◽  
Electrospun Membrane ◽  
Sem Images ◽  
Flat Sheet ◽  
Inorganic Matter

In this study, polyvinylidene fluoride with an additive of nanozeolite (PVDF/NZ) membranes were prepared, characterized and evaluated. The concentrations of the nanozeolite incorporated into PVDF were varied from 0.25%, 0.50% and 0.75 % with N-methyl-2-pyrrolidone (NMP) as solvent and the corresponding effects of nanozeolite on the polymer matrix were investigated in terms of performance and properties. There are two methods in preparing the membranes, namely: Non-solvent Induced Phase Separation (NIPS) and electrospinning. The hydrophobicity of the membranes was characterized by contact angle, the surface morphology using Scanning Electron Microscopy (SEM), and the mechanical properties by Universal Testing Machine (UTM). The presence of organic and inorganic matter was investigated using Fourier-Transform Infrared (FTIR). The SEM images of both fabricated nanocomposite membranes showed that after the addition of nanozeolite particles into PVDF matrix has affected the surface morphology, flat-sheet resulted decreasing in porous and electrospun resulted less beads and increasing fiber diameter after adding an extra amount of nanozeolite. The chemical bond or molecular structure of flat-sheet and electrospun membranes obtained same functional groups, however the electrospun resulted a high absorption of alkanes. The contact angle of both nanocomposite fabricated membranes exhibited an increasing contact angle, yet the PVDF/0.75NZ of electrospun membrane obtained higher hydrophobic surface compared to others. The result of UTM showed that on flat-sheet, the tensile strength was obtained by pure PVDF membrane while the PVDF/0.25NZ of electrospun membrane was able to achieve an optimum tensile strength. In fact, the tensile strength via NIPS need to be improved.

Solidification characteristics of polymer solution during polyvinylidene fluoride membrane preparation by nonsolvent-induced phase separation

2013 ◽  
Vol 438 ◽  
pp. 77-82 ◽  
Author(s):  
Toru Ishigami ◽  
Keisuke Nakatsuka ◽  
Yoshikage Ohmukai ◽  
Eiji Kamio ◽  
Tatsuo Maruyama ◽  
...  
Keyword(s):  
Phase Separation ◽  
Polymer Solution ◽  
Polyvinylidene Fluoride ◽  
Membrane Preparation

scholarly journals Surface morphology of electrospun PLA fibers: mechanisms of pore formation

RSC Advances ◽  
2014 ◽  
Vol 4 (83) ◽  
pp. 44082-44088 ◽  
Author(s):  
Lakshmi Natarajan ◽  
Jackie New ◽  
Aravind Dasari ◽  
Suzhu Yu ◽  
Munirah Abdul Manan
Keyword(s):  
Phase Separation ◽  
Relative Humidity ◽  
Surface Morphology ◽  
Pore Formation ◽  
Surface Pores

Interaction of relative humidity with solvent(s) is relatively more important in obtaining surface pores than solvent volatility and phase separation.

scholarly journals Do ZnO and Al2O3 Nanoparticles Improve the Anti-Bacterial Properties of Cellulose Acetate-Chitosan Membrane?

2018 ◽  
Vol 156 ◽  
pp. 08009 ◽  
Author(s):  
Titik Istirokhatun ◽  
Ulva Yuni ◽  
Pertiwi Andarani ◽  
Heru Susanto
Keyword(s):  
Antimicrobial Activity ◽  
Phase Separation ◽  
Surface Morphology ◽  
Cellulose Acetate ◽  
Water Permeability ◽  
Al2o3 Nanoparticles ◽  
Gram Negative Bacteria ◽  
Gram Negative ◽  
Chitosan Membrane ◽  
Chitosan Membranes

Biofouling, due to the existence of bacteria in water, becomes one of the barriers in cellulose acetate (CA) membrane applications. Although chitosan has been incorporated into CA membranes, its antimicrobial activity has not been improved significantly yet. In this study, cellulose acetate-chitosan membranes were prepared by modification using ZnO and Al2O3 nanoparticles during phase separation method. The membranes were then characterized in term of water permeability, and surface morphology. The anti-bacteria property was examined by using gram-negative bacteria. Modification of cellulose acetate-chitosan membranes with ZnO and Al2O3 nanoparticles have not shown optimal results where no clear zones around the membrane are visible.

scholarly journals Designing of a novel polyvinylidene fluoride/TiO2/UiO-66-NH2 membrane with photocatalytic antifouling properties using modified zirconium-based metal-organic framework

2021 ◽  
Author(s):  
Yi-Jing Li ◽  
Gui-E Chen ◽  
Lian-Jing Liu ◽  
Zhen-Liang Xu ◽  
Sun-Jie Xu ◽  
...  
Keyword(s):  
Phase Separation ◽  
Bovine Serum Albumin ◽  
Polyvinylidene Fluoride ◽  
Metal Organic Framework ◽  
Rejection Rate ◽  
Separation Performance ◽  
Recovery Ratio ◽  
Quantitative Measurements ◽  
Metal Organic ◽  
Bsa Rejection

Abstract Novel polyvinylidene fluoride/TiO2/UiO-66-NH2 (PVDF/TiUN) membranes were produced by the delay phase separation method via introducing the TiO2/UiO-66-NH2 (TiUN) nanocomposite into PVDF casting solution. Interconnection of TiO2 and UiO-66-NH2 improved photocatalysis capacity and endowed PVDF/TiUN membranes with self-cleaning capability. Quantitative measurements showed that, firstly, PVDF/TiUN membranes exhibited improved photodegradation kinetics and efficiency (up to 88.1%) to Rhodamine B (RhB). Secondly, the performances of bovine serum albumin (BSA) rejection and permeation of PVDF/TiUN membranes outperformed those of other check samples, indicating enhanced hydrophilicity. Thirdly, rejection rate of BSA reached to breathtaking 98.14% and flux recovery ratio (FRR) of BSA reached breathtaking 95.37%. Thus, given their excellent anti-contamination property and separation performance, the PVDF/TiUN membrane is very likely to be a novel water treatment membrane.

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