This page contains a list of user images about Membrane which are relevant to the point and besides images, you can also use the tabs in the bottom to browse Membrane news, videos, wiki information, tweets, documents and weblinks.
Music video by Rihanna performing Take A Bow. YouTube view counts pre-VEVO: 66288884. (C) 2008 The Island Def Jam Music Group.
The Truth About Love available on iTunes NOW http://smarturl.it/tal Music video by P!nk performing Just Give Me A Reason. (C) 2012 RCA Records, a division of...
Sometimes you promise someone forever but it doesn't work out that way. Watch Katy Perry and Diego Luna star in the sixth chapter of the "Teenage Dream" stor...
Download This Song: http://bit.ly/KzLBGB Click to Tweet this Vid-ee-oh! http://bit.ly/Nt9lg8 Hi. My name is Nice Peter, and this is EpicLLOYD, and this is th...
Macklemore & Ryan Lewis present the official music video for Can't Hold Us feat. Ray Dalton. Can't Hold Us on iTunes: https://itunes.apple.com/us/album/cant-...
This video accidentally turned out kind of sad, ME SO SOWWY IT NOT POSED TO BE SAD WHO WANTS HUGS AND COOKIES? Also, FYI for anyone attempting this, it takes...
Jimmy reveals that he is f*@#ing Ben Affleck.
So i was pretty hesitant to make this video... but after all of your request, here is my Draw My Life video! Check out my 2nd Channel for more vlogs: http://...
A substitute teacher from the inner city refuses to be messed with while taking attendance.
Buy at iTunes: http://goo.gl/zv4o9. New album on sale now! http://turtleneckandchain.com.
download this song: http://bit.ly/ERB17 click to tweet this vid-ee-oh! http://clicktotweet.com/vCJ_8 This. Is. Merchandise: http://bit.ly/ERBMerch Hi. My nam...
Music video by Rihanna performing Disturbia. YouTube view counts pre-VEVO: 48070735. (C) 2008 The Island Def Jam Music Group.
Buy on iTunes: http://www.Smarturl.it/TTT Amazon: http://idj.to/svJVGM Music video by Rihanna performing Where Have You Been. ©: The Island Def Jam Music Group.
A membrane is a thin, film-like structure that separates two fluids. It acts as a selective barrier, allowing some particles or chemicals to pass through, but not others. In some cases, especially in anatomy, membrane may refer to a thin film that is primarily a separating structure rather than a selective barrier.
The concept of a membrane has been known since the eighteenth century, but was used little outside of the laboratory until the end of World War II. Drinking water supplies in Europe had been compromised by the war and membrane filters were used to test for water safety. However, due to the lack of reliability, slow operation, reduced selectivity and elevated costs, membranes were not widely exploited. The first use of membranes on a large scale was with microfiltration and ultra-filtration technologies. Since the 1980’s, these separation processes, along with electrodialysis, are employed in large plants and, today, a number of experienced companies serve the market.
A membrane is a layer of material which serves as a selective barrier between two phases and remains impermeable to specific particles, molecules, or substances when exposed to the action of a driving force. Some components are allowed passage by the membrane into a permeate stream, whereas others are retained by it and accumulate in the retentate stream.
Membranes can be of various thickness, with homogeneous or heterogeneous structure. Membrane can also be classified according to their pore diameter. According to IUPAC, there are three different types of pore size classifications: microporous (dp < 2 nm), mesoporous (2 nm < dp < 50 nm) and macroporous (dp > 50 nm). Membranes can be neutral or charged, and particles transport can be active or passive. The latter can be facilitated by pressure, concentration, chemical or electrical gradients of the membrane process. Membranes can be generally classified into synthetic membranes and biological membranes.
Industrial use 
Certain features of membranes are responsible for the interest in using them as substitutes to consolidated industrial separation processes, like distillation, adsorption or extraction. Some advantages noted include:
- Less energy-intensive, since they do not require major phase changes
- Do not demand adsorbents or solvents, which may be expensive or difficult to handle
- Equipment simplicity and modularity, which facilitates the incorporation of more efficient membranes
- "Membranes on Polyolefins Plants Vent Recovery, Improvement Economics Program". by Intratec, ISBN 978-0615678917, Q3 2012.
- Zydney, Andrew L.; Zeman, Leos J. (1996). Microfiltration and ultrafiltration: principles and applications. New York: CRC. ISBN 0-8247-9735-3.
- Macroporous Materials Containing Three Dimensional Periodic Structures
- Mulder, Marcel (1996). Basic principles of membrane technology (2 ed.). Kluwer Academic: Springer. ISBN 0-7923-4248-8.