scholarly journals Solution Blown Nylon 6 Nanofibrous Membrane as Scaffold for Nanofiltration

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 364 ◽  
Author(s):  
Ya Liu ◽  
Gaokai Zhang ◽  
Xupin Zhuang ◽  
Sisi Li ◽  
Lei Shi ◽  
...  
Keyword(s):  
Pore Size ◽  
Hot Pressing ◽  
Porous Scaffold ◽  
Pure Water ◽  
Areal Density ◽  
Nylon 6 ◽  
Nanofibrous Membrane ◽  
Diameter Distribution ◽  
Nanofiltration Membranes ◽  
Filtration Performance

In this work, a nylon 6 nanofibrous membrane was prepared via solution blowing technology and followed hot-press as scaffold for nanofiltration. The structure and properties of the hot-pressed nylon 6 nanofibrous membrane (HNM) were studied the effect of hot-pressing parameters and areal densities. Then an ultra-thin polyamide (PA) active layer was prepared by interfacial polymerization on HNM. The effects of nanofibrous scaffolds on the surface properties of ultra-thin nanofiltration membranes and their filtration performance were studied. Results showed that the nylon 6 nanofibers prepared at a concentration of 15 wt % had a good morphology and diameter distribution and the nanofibers were stacked more tightly and significantly reduced in diameter after hot pressing at 180 °C under the pressure of 15 MPa for 10 s. When the porous scaffold was prepared, HNM with an areal density of 9.4 and 14.1 g/m2 has a better apparent structure, a smaller pore size, a higher porosity and a greater strength. At the same time, different areal densities of HNM have an important influence on the preparation and properties of nanofiltration membranes. With the increase of areal density, the uniformity of HNM increased while their surface roughness and pore size decreased, which is beneficial to the establishment of PA barrier layer. With areal density of 9.4 and 14.1 g/m2, the as-prepared nanofiltration membrane has a smoother surface and more outstanding filtration performance. The pure water flux is 13.1 L m−2 h−1 and the filtration efficiencies for NaCl and Na2SO4 are 81.3% and 85.1%, respectively.

Nanofiltration membranes with narrowed pore size distribution via pore wall modification

2016 ◽  
Vol 52 (55) ◽  
pp. 8589-8592 ◽  
Author(s):  
Yong Du ◽  
Yan Lv ◽  
Wen-Ze Qiu ◽  
Jian Wu ◽  
Zhi-Kang Xu
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Pore Wall ◽  
Nanofiltration Membranes ◽  
Novel Method

A novel method has been proposed to modify the pore wall of nanofiltration membranes (NFMs) by filtrating molecules that are reactive to the NFMs, leading to narrowed pore size distribution.

scholarly journals Filtration performance and pore size distribution of hypochlorite aged PES/PVP ultrafiltration membranes

2015 ◽  
Vol 474 ◽  
pp. 175-186 ◽  
Author(s):  
Bastien Pellegrin ◽  
Fernanda Mezzari ◽  
Yamina Hanafi ◽  
Anthony Szymczyk ◽  
Jean-Christophe Remigy ◽  
...  
Keyword(s):  
Pore Size Distribution ◽  
Pore Size ◽  
Size Distribution ◽  
Ultrafiltration Membranes ◽  
Filtration Performance

Development of Scaffold Building Units and Assembly for Tissue Engineering Using Fused Deposition Modelling

2009 ◽  
Vol 83-86 ◽  
pp. 269-274 ◽  
Author(s):  
Syed H. Masood ◽  
Kadhim Alamara
Keyword(s):  
Tissue Engineering ◽  
Pore Size ◽  
Fused Deposition Modeling ◽  
Porous Scaffold ◽  
Cell Structure ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Fused Deposition Modelling ◽  
Fused Deposition ◽  
Unit Cells

In tissue engineering (TE), a porous scaffold structure of biodegradable material is required as a template to guide the proliferation, growth and development of cells appropriately in three dimensions. The scaffold must meet design requirements of appropriate porosity, pore size and interconnected structure to allow cell proliferation and adhesion. This paper presents a methodology for design and manufacture of TE scaffolds with varying porosity by employing open structure building units and Fused Deposition Modeling (FDM) rapid prototyping technique. A computer modeling approach for constructing and assembly of three-dimensional unit cell structure is presented to provide a solution of scaffolds design that can potentially meet the diverse requirements of TE applications. A parametric set of open polyhedral unit cells is used to assist the user in designing the required micro-architecture of the scaffold with required porosity and pore size and then the Boolean operation is used to create the scaffold of a given CAD model from the designed microstructure. The procedure is verified by fabrication of physical scaffolds using the commercial FDM system.

Combined Effects of Surface Charge and Pore Size on Co-Enhanced Permeability and Ion Selectivity through RGO-OCNT Nanofiltration Membranes

2018 ◽  
Vol 52 (8) ◽  
pp. 4827-4834 ◽  
Author(s):  
Haiguang Zhang ◽  
Xie Quan ◽  
Shuo Chen ◽  
Xinfei Fan ◽  
Gaoliang Wei ◽  
...  
Keyword(s):  
Surface Charge ◽  
Pore Size ◽  
Ion Selectivity ◽  
Combined Effects ◽  
Nanofiltration Membranes

Oligo-ethylene-glycol based thin-film composite nanofiltration membranes for effective separation of mono-/di-valent anions

2019 ◽  
Vol 7 (4) ◽  
pp. 1849-1860 ◽  
Author(s):  
Dan Ren ◽  
Xiao-Tian Bi ◽  
Tian-Yin Liu ◽  
Xiaolin Wang
Keyword(s):  
Thin Film ◽  
Ethylene Glycol ◽  
Pore Size ◽  
Aromatic Polyamide ◽  
Nanofiltration Membranes ◽  
Film Composite ◽  
Thin Film Composite ◽  
Effective Separation

A novel oligo-ethylene-glycol-containing semi-aromatic polyamide NF membrane with precise pore size shows effective separation for mono-/divalent anions.

Preparation and filtration performance of the circular weft-knitted seamless weft-insertion fabric materials

2019 ◽  
pp. 152808371985532 ◽  
Author(s):  
Fei Tian ◽  
Gaoming Jiang ◽  
Zhe Gao
Keyword(s):  
Pore Size ◽  
Production Efficiency ◽  
Filtration Efficiency ◽  
High Porosity ◽  
Filtration Performance ◽  
Air Particulate ◽  
Forming Technology ◽  
New Type ◽  
High Production ◽  
Fabric Materials

Air particulate matter pollution has become a severe environment concern calling for filtration materials with great filtration performance. As the development of seamless forming technology, knitted filtration materials gradually show great potential. This study aimed to develop a novel kind of knitted seamless structure for filtration materials of filter bags with high production efficiency and excellent filtration performance. A new type of the circular weft-knitted seamless weft-insertion fabric (CKSW) filtration materials were developed on the modified circular knitting machine. This CKSW filtration materials consisting of the ground yarns, connection yarns and weft-insertion yarns, polyester full drawn yarns, and polyester draw texturing yarns with different yarn configurations were employed to realize series of CKSW samples. The polytetrafluoroethylene filaments with tourmaline particles were used to verify whether the static electric material produced an adsorption filtration effect on the CKSW filtration materials or not. After pretreatment, the filtration performance of the CKSW filtration materials was evaluated by analyzing its pore size, porosity, and filtration efficiency. Ultimately, the CKSW filtration materials with ground yarns and weft insertion yarns of draw texturing yarn and the connection yarns of full drawn yarn exhibited the most excellent filtration performance. The CKSW filtration materials show a high porosity of 87.14%, the pore size of 67.55 µm, and good filtration efficiency of 91.57% with the particles size of ≥ 5.0 µm. The successful fabrication of such knitted filtration materials may provide ideas for the development of filtration materials with new architecture mainly used as filter bags for baghouse.

Preparation and Characterization of Ha/Gel/β-TCP Microspheres Composite Porous Scaffold

2018 ◽  
Vol 782 ◽  
pp. 103-115
Author(s):  
Yang Zi Zhao ◽  
You Fa Wang
Keyword(s):  
Tissue Engineering ◽  
Compressive Strength ◽  
Hyaluronic Acid ◽  
Pore Size ◽  
Porous Scaffold ◽  
Three Dimensional ◽  
Swelling Ratio ◽  
Cell Compatibility ◽  
Hydrogel Scaffolds

Being one of the three elements of tissue engineering, three-dimensional porous structure scaffold plays an important role in tissue engineering. As it not only prvovide cells for the life, but also serves as a template to guide tissue regeneration and control of organizational structure and other functions. In this study, hyaluronic acid and gelatin are successfully cross-linked by 1-ethyl- (3-dimethylaminopropyl) -carbodiimide hydrochloride (EDC) , and compound β-TCP microspheres to prepare porous hydrogel scaffolds. The microspheres were analyzed by X-ray diffraction (XRD). The scaffolds were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). At the same time, the compressive strength, swelling ratio, degradation of the scaffold were tested. To assess the in vitro cell compatibility of the scaffolds, mouse L929 fibroblasts were seeded onto scaffolds for cell morphology and cell viability studies. The results showed that the pore size of the porous scaffold can be adjusted by changing the ratio of gelatin to hyaluronic acid (HA), increasing the proportion of hyaluronic acid in a certain range, pore size will be significantly increased. With the increase of the proportion of hyaluronic acid in the scaffold, the swelling ratio and the degradation rate also increased. The compressive strength of the scaffold increased with the increase of the proportion of gelatin. The appropriate ratio of β-TCP can promote cell growth and proliferation.

scholarly journals Promotion of tendon growth into implant through pore-size design of a Ti-6Al-4 V porous scaffold prepared by 3D printing

2021 ◽  
Vol 197 ◽  
pp. 109219
Author(s):  
Yuhao Zheng ◽  
Qing Han ◽  
Dongdong Li ◽  
Fan Sheng ◽  
Zhiming Song ◽  
...  
Keyword(s):  
3D Printing ◽  
Pore Size ◽  
Porous Scaffold

Preparation of Fine Porous Ultrafiltration Membranes from Polyacrylonitrile

2020 ◽  
Vol 869 ◽  
pp. 437-442
Author(s):  
Alexey A. Yushkin ◽  
Alexey V. Balynin ◽  
Mikhail E. Efimov ◽  
Galina Karpacheva ◽  
Alexey V. Volkov
Keyword(s):  
Pore Size ◽  
Polymer Concentration ◽  
Volatile Component ◽  
Membrane Preparation ◽  
Solubility Parameters ◽  
Precipitation Method ◽  
Hansen Solubility Parameters ◽  
Casting Solution ◽  
Filtration Performance ◽  
Hansen Solubility

PAN membranes were prepared from mixture of good and weak solvents by two different methods. Immersion precipitation method with and without volatile component evaporation used for membrane preparation. From analysis of Hansen solubility parameters DMSO chosen as good solvent and acetone chosen as weak solvent. The effect of volatile weak solvent investigated on pore size and filtration performance. By evaporation of acetone, it was possible to increase polymer concentration on casting solution and obtain smaller pore size in comparison to membrane prepared from DMSO. Membranes prepared from DMSO/acetone without solvent evaporation had even lower pore size and higher filtration performances. It was shown, that presence of acetone creates more pronounced effect on pore size than increase of polymer concentration. As a result membranes with pore size 3.7 nm obtained from Acetone/DMSO mixture with composition 50:50 and polymer concentration 50 % by immersion precipitation Resulted membranes have permeance 23 kg/m2·h·bar and retention of Lysozime 99 %.

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