scholarly journals Supercritical Phase Inversion: A Powerful Tool for Generating Cellulose Acetate-AgNO3 Antimicrobial Membranes

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1560
Author(s):  
Lucia Baldino ◽  
Stefano Cardea ◽  
Ernesto Reverchon
Keyword(s):  
Cellulose Acetate ◽  
Phase Inversion ◽  
Active Agent ◽  
Composite Membranes ◽  
Time Interval ◽  
Membrane Pore ◽  
Supercritical Phase ◽  
Silver Nitrate Concentration ◽  
Membrane Pore Size ◽  
Silver Release

Antimicrobial composite membranes, formed by cellulose acetate loaded with AgNO3 particles, were produced by supercritical phase inversion. Different cellulose acetate concentrations were tested (15%, 20%, 30%(w/w)), whereas the active agent (i.e., silver nitrate) concentration was fixed at 0.1%(w/w) with respect to the quantity of polymer used. To determine the influence of the process parameters on membranes morphology, the pressure and temperature were varied from 150 to 250 bar and from 55 to 35 °C, respectively. In all cases, regularly porous membranes were produced with a uniform AgNO3 distribution in the membrane matrix. Silver release rate depended on membrane pore size, covering a time interval from 8 to 75 h.

Preparation and characterization of cellulose acetate-Laponite® composite membranes produced by supercritical phase inversion

2020 ◽  
Vol 155 ◽  
pp. 104651 ◽  
Author(s):  
Antonio Tabernero ◽  
Stefano Cardea ◽  
Rubén Masa ◽  
Lucia Baldino ◽  
Eva M. Martín del Valle ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Phase Inversion ◽  
Composite Membranes ◽  
Supercritical Phase

scholarly journals FOULING BEHAVIOR OF MODIFIED CELLULOSE ACETATE ASYMMETRIC MEMBRANES FOR DIFFERENT BRACKISH WATER TREATMENT

REAKTOR ◽  
2017 ◽  
Vol 17 (1) ◽  
pp. 43
Author(s):  
Tutuk Djoko Kusworo ◽  
B Budiyono ◽  
Ulfa Nurul Aulia Rochyani
Keyword(s):  
Water Treatment ◽  
Cellulose Acetate ◽  
Skin Layer ◽  
Cellulose Acetate Membrane ◽  
Treatment Technology ◽  
Membrane Pore ◽  
Membrane Morphology ◽  
Dope Solution ◽  
And Performance ◽  
Membrane Pore Size

Water treatment technology which is being widely developed is membrane technology as an alternative technology with sieving mechanism principle.The main purposes of this research are to investigate the effects of additives and thermal treatment on the cellulose acetate membrane morphology and performance in treating brackish water.The membrane was fabricated by preparation of dope solution consits of cellulose acetate and acetone. The membrane was casted via NIPS method using mechanic casting knife. Dope solution was prepared by varying the PEG concentration of 1 and 5wt-% and the annealing temperature at 60°C and 25°C for 10 seconds. The backwash technique was used to solve fouling mechanism in this system .The results of SEM and FTIR showed that theb higher PEG addition to the dope solution resulted in larger membrane pore size and increase the hydrophilic properties of membrane. However the higher temperature and the longer annealing timg, the skin layer of membrane become denser. The result was also shown that back wash technique can reduced fouling phenomenon in the membrane. 

scholarly journals Optimization of protein fractionation by skim milk microfiltration: Choice of ceramic membrane pore size and filtration temperature

2016 ◽  
Vol 99 (8) ◽  
pp. 6164-6179 ◽  
Author(s):  
Camilla Elise Jørgensen ◽  
Roger K. Abrahamsen ◽  
Elling-Olav Rukke ◽  
Anne-Grethe Johansen ◽  
Reidar B. Schüller ◽  
...  
Keyword(s):  
Pore Size ◽  
Ceramic Membrane ◽  
Skim Milk ◽  
Protein Fractionation ◽  
Membrane Pore ◽  
Membrane Pore Size

Relationship between Cake Structure and Membrane Pore Size in Crossflow Filtration of Microbial Cell Suspension Containing Fine Particles

2001 ◽  
Vol 34 (12) ◽  
pp. 1524-1531 ◽  
Author(s):  
TAKAAKI TANAKA ◽  
YOSHINOBU YAMAGIWA ◽  
TETSUYA NAGANO ◽  
MASAYUKI TANIGUCHI ◽  
KAZUHIRO NAKANISHI
Keyword(s):  
Pore Size ◽  
Cell Suspension ◽  
Fine Particles ◽  
Microbial Cell ◽  
Crossflow Filtration ◽  
Membrane Pore ◽  
Membrane Pore Size

Capillary network structure does not affect theoretical analysis of glomerular size selectivity

1995 ◽  
Vol 268 (5) ◽  
pp. F972-F979
Author(s):  
A. Remuzzi ◽  
B. Ene-Iordache
Keyword(s):  
Pressure Drop ◽  
Homogeneous Model ◽  
Wistar Rat ◽  
Size Selectivity ◽  
Membrane Pore ◽  
Heterogeneous Model ◽  
Glomerular Size ◽  
The Difference ◽  
Membrane Pore Size ◽  
Log Normal

Anatomical studies have demonstrated that the glomerular capillaries are complex and heterogeneous networks. Conventional models of glomerular size selectivity, however, are based on the assumption of simplified geometries. We developed a theoretical model of glomerular size-selective function based on the geometric data obtained in a previous reconstruction of a glomerular network from a normal Munich-Wistar rat. This heterogeneous model was compared with the homogeneous model conventionally used to calculate membrane selective parameters from the fractional clearance of two test solutes, neutral dextran and Ficoll. For both models we assumed a hypothetical log-normal distribution of pore sizes and calculated optimal membrane pore-size parameters using previously published values of fractional clearances. The difference between the sieving coefficients calculated with the two models was negligible, never exceeding 5.5%. Since the homogeneous model does not consider the pressure drop along the glomerular capillary, we also computed fractional clearances with the homogeneous model, assuming the same pressure drop as in the heterogeneous one. The differences in computed fractional clearances using the homogeneous model with and without a pressure drop were less than 1.2%. We concluded that models based on identical capillary networks can therefore be used for interpreting sieving coefficients for macromolecules.

Composite Membranes with Cellulose Acetate Surface Layer for Water Treatment

2021 ◽  
Vol 12 (5) ◽  
pp. 1229-1235
Author(s):  
D. D. Fazullin ◽  
L. I. Fazullina ◽  
G. V. Mavrin ◽  
I. G. Shaikhiev ◽  
V. O. Dryakhlov
Keyword(s):  
Surface Layer ◽  
Water Treatment ◽  
Cellulose Acetate ◽  
Composite Membranes

Antifouling Property and Morphology of Polyethersulfone Membranes Blended with Bio-Based Amphiphilic Polymer Additives

2019 ◽  
Vol 824 ◽  
pp. 38-44
Author(s):  
Yupin Phuphuak ◽  
Thidarat Loythaworn
Keyword(s):  
Contact Angle ◽  
Water Contact Angle ◽  
Membrane Fouling ◽  
Water Adsorption ◽  
Membrane Properties ◽  
Water Contact ◽  
Membrane Pore ◽  
Low Protein ◽  
Separation Membrane ◽  
Membrane Pore Size

In this work, polyethersulfone (PES) was blended with bio-based polymers, PLA (hydrophobic polymer) and PEG (hydrophilic polymer), in order to improve the antifouling properties of PES membranes. This was done by way of non-solvent induced phase separation. Membrane properties such as morphology, hydrophilicity/hydrophobicity, adsorption fouling and mechanical properties were characterized. All blended membranes displayed higher hydrophilicity than that of pristine PES. This was confirmed by lower water contact angle and higher water adsorption. It was found that membranes with 5 wt% PLA/PEG gave a water contact angle of 65.1° and water adsorption for 4.94. These were the best values obtained. These modifications yielded low protein adsorption leading to reduce membrane fouling. Adding a greater amount of PLA/PEG reduced the membrane pore size, enhanced hydrophilicity and improved the antifouling capability

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