Energy & Green Tech
In recent times, hydrogen has drawn significant attention as a potential clean energy resource as an alternative to fossil fuels. In particular, there has been active research and development of water electrolysis technology ...
Jan 28, 2022
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517
Energy & Green Tech
Proton exchange membrane fuel cells (PEMFCs) are power cells that can transform the chemical energy produced during the electrochemical reaction between hydrogen and oxygen into electrical energy. While these cells could ...
Energy & Green Tech
Nanodiamonds may be tiny, but they can help with one of the biggest problems facing humanity today: climate change.
Dec 16, 2021
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130
Electronics & Semiconductors
Imagine an iPad or a Kindle for the blind, with inflatable Braille that changes shape under a user's touch. A Cornell-led collaboration has made a crucial component for such a technology: A haptic array of densely packed ...
Oct 5, 2021
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491
Engineering
The separation of light hydrocarbon mixtures is among the most important petrochemical and industrial processes. This process is currently regarded as highly energy intensive, as it has so far been carried out using conventional ...
Engineering
Small changes in membrane design can have a large impact on the performance of a new technology developed at KAUST that uses waste heat from solar cells for seawater desalination.
Aug 3, 2021
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1395
Energy & Green Tech
The energy density of traditional lithium-ion batteries is approaching a saturation point that cannot meet the demands of the future—for example in electric vehicles. Lithium metal batteries can provide double the energy ...
Jun 17, 2021
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11
Engineering
By now, it's well known that circulating outdoor air in buildings is safer than recirculating indoor air. That point was driven home by the pandemic. Problem is, it's just not cost-effective.
Jun 17, 2021
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26
Energy & Green Tech
Generating energy from the difference in salt concentration between sea water and river water sounds like magic, yet it really works! Blue energy, as this rather obscure form of sustainable power is commonly known, has huge ...
Jun 10, 2021
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13
Engineering
Filtration membranes are critical to a wide variety of industries around the world. Made of materials as varied as cellulose, graphene, and nylon, they serve as the barriers that turn seawater into drinking water, separate ...
May 11, 2021
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30
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 < 2nm), mesoporous (2nm < dp < 50nm) and macroporous (dp > 50nm). 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 three groups: inorganic, polymeric or biological membranes. These three types of membranes differ significantly in their structure and functionality.
This text uses material from Wikipedia, licensed under CC BY-SA
