Surface characterization of biocompatible polysulfone membranes modified with poly(ethylene glycol) derivatives

Kim, Yong‐Wan; Kim, Jae‐Jin; Kim, Young Ha

doi:10.1007/bf02706955

Cited by 16 publications

(4 citation statements)

References 28 publications

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“…Sterilization‐induced changes in the membrane contact angles were also observed, with e‐beam treatment rendering the fibers more hydrophilic (47–48°) than the ETO and bleach treatments (55–57°). Extended bleach sanitation time beyond 2 min dramatically increased the fiber hydrophobicity, with 1–2 h bleach treatments yielding WCAs approaching that of pure PS (81–86°) 9, 21. These results illustrate that the fiber lumen nodule size could be decreased and the outer‐wall porosity simultaneously increased with either e‐beam or bleach sterilization compared to ETO sterilization.…”

Section: Discussionmentioning

confidence: 81%

Effect of sterilization techniques on the physicochemical properties of polysulfone hollow fibers

Madsen

Britt

Griffiths

et al. 2010

J of Applied Polymer Sci

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Sterilized hollow-fiber membranes are used in hemodialysis, ultrafiltration, bioprocessing, and tissue engineering applications that require a stable and biocompatible surface. In this study, we demonstrated significant changes in the fiber physicochemical properties with different methods of sterilization. Commercial polysulfone (PS) hollow fibers containing poly(vinyl pyrrolidone) were subjected to standard ethylene oxide (ETO), sodium hypochlorite (bleach), and electron-beam (e-beam) sterilization techniques followed by analysis of the surface hydrophilicity, morphology, and water-retention ability. E-beam sterilization rendered more hydrophilic fibers with water contact angles near 47 compared to the ETO-and bleachtreated fibers, which were each near 56. Atomic force microscopy revealed lumen root mean square (rms) roughness values near 19 nm for all three sterilization methods;however, e-beam-sterilized and bleach-treated fibers had significantly higher ($ 106 nm) rms values for the outer wall compared to the ETO-sterilized fibers ($ 39 nm). The increased hydrophilicity and surface area of the e-beamsterilized fiber were reflected by a greater water evaporation rate than that of the ETO-treated fiber. These results demonstrate that common sterilization methods may significantly and distinctly alter the polymer membrane physicochemical properties, which may, in turn, impact the performance and, in particular, surface fouling. For tissue engineering and bioprocessing applications, these changes may be leveraged to promote cell adhesion and spreading.

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Section: Discussionmentioning

confidence: 81%

Effect of sterilization techniques on the physicochemical properties of polysulfone hollow fibers

Madsen

Britt

Griffiths

et al. 2010

J of Applied Polymer Sci

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“…To characterize the membrane hydraulic resistance (R m ) and compaction, the pure water (de-ionized water) flux of membranes can calculate at different transmembrane pressures (∆P) later than compaction. Yasuda and Tsai [100], revealed that after earlier time, the initial flux would be started after the pressurization of a test cell. The de-ionized water permeates usually dropped severely in the starting and flattened steady Desalination state after about 6 to 8 h. The resistance of the membrane, R m , can be examined from the slope of water flux vs. (∆P) graph, and Figure 7 shows R m vs. flux with respect to time.…”

Section: Membrane Affinity Testmentioning

confidence: 99%

“…Equilibrium moisture content or water uptake or water swelling is considered to be an essential tool to characterization factor as it indirectly shows the degree of hydrophilicity or hydrophobicity of a membrane [17,[100][101][102]. EWC is directly related to the porosity, and UF/MF membrane and the porosity play a vital role not only in also characterizing in important in membrane application.…”

Section: Membrane Equilibrium Water Content (Ewc) and Porositymentioning

confidence: 99%

“…Some of them give information on the overall membrane porosity. Nevertheless, the porosity of the membrane can be measured by the gravimetric method, and by apparent density method as reported several researchers [11,[100][101][102][103][104][105][106][107]. According to this approach, the average membrane porosity is determined as the overall void fraction, calculated as the volume of the pores divided by the total volume of the membrane.…”

Section: Membrane Equilibrium Water Content (Ewc) and Porositymentioning

confidence: 99%

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Importance and Significance of UF/MF Membrane Systems in Desalination Water Treatment

Ahmed¹,

Balkhair²,

Albeiruttye³

et al. 2017

Desalination

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The proposed chapter addresses a comprehensive overview of the history and future outlook of ultrafiltration/microfiltration (UF/MF) membrane for desalination water pretreatment. Known theories on UF/MF membrane formation from phase inversion (Dr/wet) systems can be prolonged to define the consequences of high or low molecular weight additives. Also, direct material reengineering and surface modification for high-performance antifouling of UF/MF membranes are also highlighted. Before the modern final polymeric film, the characterization techniques, particularly molecular weight cutoff , pore size, pore size distribution, and microbiological activity classification, on to the UF/MF membrane surface were presented, respectively. Lab scale to commercial scale UF/MF membrane configuration and market size of UF/MF membranes for pretreatment desalination are described. The significance of UF/MF provided here as an unconventional approach for desalination water pretreatment is in contrast with the current conventionally used technologies. The recent development made in the integration of established desalination processes, such as spiral wound reverse osmosis (SWRO), multi-stage flash (MSF), multi-effect distillation (MED), electrodialysis (ED) desalination, and UF pretreatment, is addressed. Finally, the influence of UF/MF on desalination water pretreatment step on to the energy cost of desalination process system is discussed.

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Synthesis and characterization of a novel soil stabilizer based on biodegradable poly(aspartic acid) hydrogel

Yang

Wang

Tan

2008

Korean J. Chem. Eng.

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A novel soil stabilizer based on poly-amino acid -polyaspartic acid (PASP) and its copolymer which modified by xanthan gum (XG) was studied to increase soil particle compressive strength and resistance to wind erosion. Due to its unique property, the stabilizer aggregated individual soil particles and formed crust. The sample compressive strength increased from 0.175 to 0.612 MPa and the wind erosion modulus reduced from 22.43 to 10.56 g·m −2 ·min −1 after the 1% PASP hydrogel was applied by 1.67 Lm −2 (1 cm of crust). The soil water content was higher than the control due to the polymer's excellent water-retaining property. The polymer had no negative influence on seed germination and growth. The biodegradability experiment showed that PASP was easy to biodegrade and therefore it was safe to apply in the field.

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Surface characterization of biocompatible polysulfone membranes modified with poly(ethylene glycol) derivatives

Cited by 16 publications

References 28 publications

Effect of sterilization techniques on the physicochemical properties of polysulfone hollow fibers

Effect of sterilization techniques on the physicochemical properties of polysulfone hollow fibers

Importance and Significance of UF/MF Membrane Systems in Desalination Water Treatment

Synthesis and characterization of a novel soil stabilizer based on biodegradable poly(aspartic acid) hydrogel

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