Hydrophilicity and antifouling property of membrane materials from cellulose acetate/polyethersulfone in DMAc

2016 ◽  
Vol 91 ◽  
pp. 143-150 ◽  
Author(s):  
Zhonghua Sun ◽  
Fushan Chen
Keyword(s):  
Cellulose Acetate ◽  
Membrane Materials ◽  
Antifouling Property

An evaluation of the characteristics of membrane materials suitable for the batch fabrication of dissolved oxygen sensors

2003 ◽  
Vol 20 (2) ◽  
pp. 32-40 ◽  
Author(s):  
W.V. Glasspool ◽  
J.K. Atkinson
Keyword(s):  
Dissolved Oxygen ◽  
Cellulose Acetate ◽  
Screen Printing ◽  
Tap Water ◽  
Oxygen Sensors ◽  
Membrane Materials ◽  
Membrane Fabrication ◽  
Batch Fabrication ◽  
Aerosol Spray ◽  
Effects Of Temperature

The bulk batch fabrication process of thick film technology has been utilised in the design and production of miniature amperometric dissolved oxygen sensors based on potentiostatic and voltammetric operation. Three different polymers have been investigated as membrane materials – cellulose acetate, PTFE and PVC. PTFE has been deposited on the devices by aerosol spray and PVC and cellulose acetate by screen‐printing. These methods have been shown to be effective membrane fabrication techniques, and have significant implications in the field of chemical sensors as a whole. All the membrane covered devices investigated were found to exhibit sensitive and linear responses to dissolved oxygen. The effects of temperature and flow rate on sensor response have been investigated and the use of PVC and PTFE in place of cellulose acetate have been shown to reduce both effects. These membranes have also been shown to reduce the detrimental effects of fouling observed on the surfaces of cellulose acetate covered devices as they are powered in tap water.

Research on Reverse Osmosis Membrane Materials for Seawater Desalination

2012 ◽  
Vol 600 ◽  
pp. 100-103
Author(s):  
Juan Wang ◽  
Si Yu Lai ◽  
Yang He
Keyword(s):  
Cellulose Acetate ◽  
Reverse Osmosis ◽  
Fresh Water ◽  
New Technologies ◽  
Cellulose Acetate Membrane ◽  
Reverse Osmosis Membrane ◽  
Seawater Desalination ◽  
Membrane Materials ◽  
Multi Stage ◽  
Polyamide Membrane

97.5% of the water on Earth is salty, around one percent of that is brackish groundwater, and fresh water is becoming more and more precious. Mature desalination technologies as reverse osmosis, multi-stage flash, multi-effect distillation as well as electrodialysis are introduced in this paper. Of these, such reverse osmosis membranes as cellulose acetate membrane, polyamide membrane and nanomaterials enhanced membrane are discussed. In addition, several seawater desalination processes are presented, and the working manners of three other novel desalination technologies are illustrated. After all, none of the new technologies seem simple and cheap enough to offer much benefit to people, and the appropriate method should be chose according to different nations.

scholarly journals Modifying Cellulose Acetate Mixed-Matrix Membranes for Improved Oil–Water Separation: Comparison between Sodium and Organo-Montmorillonite as Particle Additives

Membranes ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 80
Author(s):  
Micah Belle Marie Yap Ang ◽  
Kiara Pauline O. Devanadera ◽  
Alyssa Nicole R. Duena ◽  
Zheng-Yen Luo ◽  
Yu-Hsuan Chiao ◽  
...  
Keyword(s):  
Cellulose Acetate ◽  
Separation Efficiency ◽  
Pure Water ◽  
Mixed Matrix Membranes ◽  
Inversion Method ◽  
Mixed Matrix ◽  
Water Separation ◽  
Water Emulsion ◽  
Antifouling Property ◽  
Matrix Membranes

In this study, cellulose acetate (CA) mixed-matrix membranes were fabricated through the wet-phase inversion method. Two types of montmorillonite (MMT) nanoclay were embedded separately: sodium montmorillonite (Na-MMT) and organo-montmorillonite (O-MMT). Na-MMT was converted to O-MMT through ion exchange reaction using cationic surfactant (dialkyldimethyl ammonium chloride, DDAC). Attenuated total reflectance-Fourier transform infrared (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) compared the chemical structure and composition of the membranes. Embedding either Na-MMT and O-MMT did not change the crystallinity of the CA membrane, indicating that the nanoclays were dispersed in the CA matrix. Furthermore, nanoclays improved the membrane hydrophilicity. Compared with CANa-MMT membrane, CAO-MMT membrane had a higher separation efficiency and antifouling property. At the optimum concentration of O-MMT in the CA matrix, the pure water flux reaches up to 524.63 ± 48.96 L∙m−2∙h−1∙bar−1 with over 95% rejection for different oil-in-water emulsion (diesel, hexane, dodecane, and food-oil). Furthermore, the modified membrane delivered an excellent antifouling property.

Cellulose Acetate Reverse Osmosis Membrane Structure

1972 ◽  
Vol 30 ◽  
pp. 528-529
Author(s):  
H. K. Plummer ◽  
E. Eichen ◽  
C. D. Melvin
Keyword(s):  
Cellulose Acetate ◽  
Reverse Osmosis ◽  
Membrane Structure ◽  
Freeze Drying ◽  
Dense Layer ◽  
Water Removal ◽  
Reverse Osmosis Membrane ◽  
Correct Interpretation ◽  
Electron Image ◽  
Scanning Electron

Much of the work reported in the literature on cellulose acetate reverse osmosis membranes has raised new and important questions with regard to the dense or “active” layer of these membranes. Several thickness values and structures have been attributed to the dense layer. To ensure the correct interpretation of the cellulose acetate structure thirteen different preparative techniques have been used in this investigation. These thirteen methods included various combinations of water substitution, freeze drying, freeze sectioning, fracturing, embedding, and microtomy techniques with both transmission and scanning electron microscope observations.It was observed that several factors can cause a distortion of the structure during sample preparation. The most obvious problem of water removal can cause swelling, shrinking, and folds. Improper removal of embedding materials, when used, can cause a loss of electron image contrast and, or structure which could hinder interpretation.

The Control of Cigarette Smoke Deliveries Using Heat-Shrinkable Films

1975 ◽  
Vol 8 (2) ◽  
Author(s):  
R. A. Crellin ◽  
G. O. Brooks ◽  
H. G. Horsewell
Keyword(s):  
Particulate Matter ◽  
Cellulose Acetate ◽  
Cigarette Smoke ◽  
Total Particulate Matter ◽  
Puff Volume ◽  
Cigarette Paper ◽  
High Degree

AbstractA ventilating filter for cigarettes has been developed which reduces the delivery of smoke constituents from the final two to three puffs. Since the normaI delivery for these three puffs can account for up to half the total particulate matter and nicotine delivered by the whole cigarette, usefuI reductions per cigarette can be produced. The ventilating filter consists of cellulose acetate tow wrapped in heat-shrinkable film and attached to a tobacco rod using perforated tipping paper. When the cigarette is smoked, the perforations remain closed by contact with the impermeable film until transfer of heat to the filter is sufficient to soften the filter tow and shrink the film. Ventilating air now enters the cigarette and reduces the smoke deliveries. The effectiveness of the ventilating filter is increased by using films which have a low shrink temperature, high shrink tension and a high degree of biaxiaI shrinkage. Increases in filter plasticiser level, tipping perforation area and puff volume improve the effectiveness of the ventilating filter but increases in cigarette paper porosity and tobacco butt length reduce the effectiveness

Characteristics and Potential Applications of Cellulose Acetate

2014 ◽  
Vol 68 (9) ◽  
pp. 1018-1024
Author(s):  
Shu Shimamoto ◽  
Shizuka Okada ◽  
Toshikazu Nakamura
Keyword(s):  
Cellulose Acetate ◽  
Potential Applications
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