3 edition of Performance Modification Via Membrane Stretching found in the catalog.
May 12, 2007
by American Water Works Research Foundation
Written in English
|The Physical Object|
|Number of Pages||140|
The surface structures and properties of a membrane largely determine its in-service performance during a filtration process. Here we report a facile hydrophilization method via co-deposition of mussel-inspired polydopamine (PDA) and polyethyleneimine (PEI) on a polypropylene microfiltration membrane. The deposition time is greatly shortened and the surface hydrophilicity is significantly. The blending of additives in the polyethersulfone (PES) matrix is an important approach in the membrane industry to reduce membrane hydrophobicity and improve the performance (flux, solute rejection, and reduction of fouling). Several (hydrophilic) modifications of the PES membrane .
In order to study the effect of pore aspect ratio on the permeability-selectivity performance of microfiltration and ultrafiltration membranes, a study was conducted in which the aspect ratio of the pores was changed while keeping the pore cross-section area by: 4. Recently, membrane distillation (MD) has emerged as a versatile technology for treating saline water and industrial wastewater. However, the long-term use of MD wets the polymeric membrane and prevents the membrane from working as a semi-permeable barrier. Currently, the concept of antiwetting interfaces has been utilized for reducing the wetting issue of MD. This review paper discusses the Cited by: 1.
In the research into oxygen reduction reaction (ORR) catalysts that are applicable to proton exchange membrane fuel cells (PEMFCs), many efforts have been made over a long time period to increase the catalytic activity and reduce the cost. Conductive carbon black is Cited by: 3. Improved Anti-Fouling Performance of Sintered Alumina Membrane Filters Modified with Grafted-on PEG-Brush Polymer. Dennis A. Nielsen 1, Lasse Christiansen 1, Allan H. Holm 2, Karin Dooleweerdt 2, Leonid Gurevich 1,* and Peter Fojan 1. 1 Department of Physics and Nanotechnology, Aalborg University, Aalborg East, Denmark; 2 Grundfos Holding A/S, Bjerringbro, DenmarkCited by: 1.
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The hypothesis of this research was that by stretching microfiltration or ultrafiltration membranes, their performance, in terms of flux and rejection, could be improved.
Stretching a membrane was envisioned to stretch its pores, or change the aspect ration of the s: Morehouse Jason, Leah Worel, Douglas Lloyd. performance modification via membrane stretching Download Book Performance Modification Via Membrane Stretching in PDF format.
You can Read Online Performance Modification Via Membrane Stretching here in PDF, EPUB, Mobi or Docx formats. Strength and Conditioning for Sports Performance is an essential course text for any degree level student.
Performance modification via membrane stretching. [Douglas R Lloyd;] Home. WorldCat Home About WorldCat Help. Search. Search for Library Items Search for Lists Search for Contacts Search for a Library. Create lists, bibliographies and reviews: or Search WorldCat. Find items in libraries near you.
This report tests the hypothesis that by stretching microfiltration of ultrafiltration membranes their flux and rejection performance would be improved due to.
A TFC membrane prepared via interfacial polymerization has higher water permeability compared to other asymmetric membranes; however, it is limited by monomer availability and reactivity. The preparation method for a TFC NF membrane could be replaced by other methods such as layer-by-layer assembly and direct surface modification to produce the enhanced positively charged membrane and solvent resistance membrane.
The influence of membrane pore size modification on membrane performance was investigated and It was shown that the flux can be increased and decreased by stretching membranes (Worrel et al., The objective of this research is to demonstrate changes in performance characteristics of track-etched microfiltration (MF) membranes by uniaxial stretching, and to predict changes in the characteristics of pore entrances, such as major and minor axis, aspect ratio, and pore area, from known membrane properties and stretching conditions.
We analyze the pore structure changes during the fabrication of polypropylene-based microporous membranes via the stretching method.
The membranes were prepared via melt extrusion followed by annealing and stretching at room temperature and at an elevated temperature (cold and hot stretching steps, respectively).Cited by: CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): To my family and friends, who have given love, support, and patience.
Acknowledgements I would like to thank my advisor, Dr. Douglas Lloyd, and the members of the Membrane Group, Dr. Desmond Lawler and Dr. Benny Freeman, for their guidance throughout this project. I would also like to thank the other members of the.
Membrane surface properties critically affect membrane performance as it is the membrane surface that contacts the feed. Chemical modification of membrane surfaces is an attractive method to impart desirable surface properties while retaining the desired bulk polymer properties such as mechanical and chemical resistance and membrane by: 7.
Membrane Modification: Technology and Applications is written for engineers, scientists, graduate students, and researchers in the field of membrane science and technology, materials science, applied physics, chemistry, and environmental science. The book presents the complete range of membrane modification techniques used to increase efficiency of membrane : $ Membrane Modification: Technology and Applications composite membranes were prepared via the phase inversion technique and corona air plasma was employed to modify the membrane surface in.
The results for permeate flux and salt rejection show that it is possible to construct membranes for membrane distillation even from intrinsically hydrophilic materials after surface modification. Surface modification of membranes has become a key issue in membrane science and technology.
The major aim of surface modification is improving the performance of the membranes. Written by professors, engineers, and researchers in the field, the book covers recent advances and comprehensively describes novel and most-used membrane characterization techniques.
Modification of different materials and geometrics include flat-sheet, hollow-fiber, and nano-fiber membranes as well as different membrane processes such as reverse osmosis, membrane distillation, gas separation, pervaporation, and membrane fuel.
The observed solvent activation effect on membrane performance can be explained in terms of two counteracting structural deformation mechanisms of the PA layer depending on the solvency power of the solvent.
As previously mentioned, solvent-induced swelling of the PA layer can lead to the formation of a more open and looser PA structure. This is known as a defect-generation process, which would increase water permeance Cited by: Membrane wetting caused by low surface tension pollutants in feed solution has been a major challenge for membrane distillation (MD), and omniphobic m.
Biaxial stretching is a physical method where membranes are stretched to modify their properties in an effort to improve overall membrane performance.
This modification induces significant and permanent membrane pore deformation, which may result in improved porosity [ 20 ].Cited by: 1. ePTFE membranes were prepared through thermo-mechanical stretching. Thermal modification was performed to take control over morphology of fibrillated structure of ePTFE and membranes with fibril.
Membrane modification by polyelectrolytes is a promising approach for the improvement of membrane antifouling performance as both charge and hydrophilicity of the selective layer can be increased at the same time which leads to a dramatic increase of antifouling stability [ 10 ].
However, compared to the stretching ratio, the stretching rate had less influence on the membrane structure and performance. In general, as the stretching ratio was 50% and the stretching rate was 20 mm/min, the tensile strength was increased by 36% to MPa, and the pure water flux was as high as L/(m2hbar), while the mean Author: Yuanhui Tang, Yakai Lin, Hanhan Lin, Chunyu Li, Bo Zhou, Xiaolin Wang.The membrane performance was all characterized by using a dead-end filtration system with an effective membrane area of 4 cm 2 and a trans-membrane pressure of 6 bar at 25 °C.
All membranes need to be conditioned at 6 bar by nitrogen pressurization for 1 h with the test solution to obtain a steady permeability before the : Jing Cai, Xue-Li Cao, Yi Zhao, Fu-Yi Zhou, Zhaoliang Cui, Yong Wang, Shi-Peng Sun.In order to understand and predict the performance of microfiltration and ultrafiltration membranes, several efforts have been made to formulate models for the membrane performance under the influence of fouling [3,4,5,6], pore size distribution [2,7], and pore shape [8,9].Variation in pore sizes has been found to affect membrane performance by: 4.