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

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.

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Synthesis and Characterization of Novel Integral Asymmetric Monophasic Cellulose–Acetate/Silica/Titania and Cellulose–Acetate/Titania Membranes

Membranes ◽

10.3390/membranes10090195 ◽

2020 ◽

Vol 10 (9) ◽

pp. 195 ◽

Cited By ~ 1

Author(s):

Inês Peixoto ◽

Mónica Faria ◽

M. Clara Gonçalves

Keyword(s):

Cellulose Acetate ◽

Phase Inversion ◽

Sol Gel ◽

Asymmetric Structure ◽

Hydraulic Permeability ◽

Icp Oes ◽

Phase Inversion Technique ◽

In Series ◽

Covalently Bound

Two series of novel integral asymmetric monophasic hybrid membranes, cellulose acetate/silica/titania (CA/SiO2/TiO2—series 1) and cellulose acetate/titania (CA/TiO2—series 2), were developed by the coupling of sol-gel technology and a modified version of the phase inversion technique. SEM micrographs confirmed the integral asymmetric structure of all membranes. ATR-FTIR and ICP-OES results showed that, for the membranes in series 1, TiO2 is covalently bound to SiO2, which, in turn, is covalently bound to CA, while for the membranes in series 2, TiO2 is directly and covalently bound to the CA matrix. Permeation experiments revealed that the permeation performance of the membranes in series 1 is unaffected by the introduction of TiO2. In contrast, the introduction of TiO2 in the series 2 membranes increased the hydraulic permeability by a factor of at least 2 when compared to the pristine CA membrane and that incremental additions of TiO2 further increased the Lp.

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Fabrication and characterization of cellulose acetate/hydroxyapatite composite membranes for the solute separations in Hemodialysis

Polymer Bulletin ◽

10.1007/s00289-017-2084-1 ◽

2017 ◽

Vol 75 (3) ◽

pp. 1197-1210 ◽

Cited By ~ 3

Author(s):

Aneela Hayder ◽

Arshad Hussain ◽

Ahmad Nawaz Khan ◽

Hizba Waheed

Keyword(s):

Cellulose Acetate ◽

Composite Membranes ◽

Hydroxyapatite Composite ◽

Fabrication And Characterization

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Surface and Charge Transport Characterization of Polyaniline−Cellulose Acetate Composite Membranes

The Journal of Physical Chemistry B ◽

10.1021/jp109455m ◽

2011 ◽

Vol 115 (7) ◽

pp. 1652-1661 ◽

Cited By ~ 64

Author(s):

Asif A. Qaiser ◽

Margaret M. Hyland ◽

Darrell A. Patterson

Keyword(s):

Charge Transport ◽

Cellulose Acetate ◽

Composite Membranes

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Preparation and characterization of microporous PVDF/PMMA composite membranes by phase inversion in water/DMSO solutions

European Polymer Journal ◽

10.1016/j.eurpolymj.2006.05.008 ◽

2006 ◽

Vol 42 (10) ◽

pp. 2407-2418 ◽

Cited By ~ 77

Author(s):

Dar-Jong Lin ◽

Chi-Lin Chang ◽

Chih-Kang Lee ◽

Liao-Ping Cheng

Keyword(s):

Phase Inversion ◽

Composite Membranes

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Effect of the structure of cellulose acetate membranes on their permeability, electrical conductivity and rejection

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19902933 ◽

1990 ◽

Vol 55 (12) ◽

pp. 2933-2939 ◽

Cited By ~ 1

Author(s):

Hans-Hartmut Schwarz ◽

Vlastimil Kůdela ◽

Klaus Richau

Keyword(s):

Electrical Conductivity ◽

Electrical Properties ◽

Cellulose Acetate ◽

Reverse Osmosis ◽

Water Flux ◽

Cellulose Acetate Membrane ◽

Structure Parameters ◽

Dc Electrical Conductivity ◽

Cellulose Acetate Membranes

Ultrafiltration cellulose acetate membrane can be transformed by annealing into reverse osmosis membranes (RO type). Annealing brings about changes in structural properties of the membranes, accompanied by changes in their permeability behaviour and electrical properties. Correlations between structure parameters and electrochemical properties are shown for the temperature range 20-90 °C. Relations have been derived which explain the role played by the dc electrical conductivity in the characterization of rejection ability of the membranes in the reverse osmosis, i.e. rRO = (1 + exp (A-B))-1, where exp A and exp B are statistically significant correlation functions of electrical conductivity and salt permeation, or of electrical conductivity and water flux through the membrane, respectively.

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