Energy & Green Tech
Green hydrogen is a serious contender to become a renewable energy carrier. For example, we could use it to store solar and wind energy during peaks in order to utilize the energy when the sun is no longer shining and the ...
Oct 26, 2023
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Energy & Green Tech
The food industry generates enormous amounts of waste and by-products, including from poultry production. Each year, some 40 million metric tons of chicken feathers are incinerated. This not only releases large amounts of ...
Oct 20, 2023
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64
Energy & Green Tech
Proton exchange membrane fuel cells (PEMFCs) hold promise as a replacement for fossil fueled engines in heavy-duty vehicles. Reducing the platinum content in catalysts is pivotal for scaling up in such applications. Yet, ...
Sep 22, 2023
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Engineering
A chilly winter morning, the car windshield shrouded in a thick layer of frost. Who has not experienced the frustration of scraping ice or waiting for the defroster to work? It is a daily winter struggle, but what if this ...
Sep 6, 2023
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Energy & Green Tech
The supply–demand imbalance of clean water has resulted in a global sustainability crisis. The United Nations World Water Developments Report 2023 reveals that 2–3 billion people are suffering from a shortage of water.
Sep 5, 2023
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Engineering
Membrane technologies can provide efficient purification of unclear water sources to address a growing water shortage. However, when engineers develop state-of-the-art membranes, they are constrained by a lack of selectivity ...
Energy & Green Tech
Did you know rivers carry about 40 trillion metric tons of river water into the ocean every year? This meeting point, known as the estuary, holds great potential for electricity generation.
Jul 27, 2023
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12
Engineering
Researchers at CU Boulder have developed a new membrane water filtration system based around air bubbles that can help address water scarcity issues around the world.
Jul 25, 2023
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61
Engineering
The ocean isn't just impacted by climate change—it may also be part of the solution to reversing it.
Jul 24, 2023
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20
Engineering
Effectively extracting valuable resources from water could go a long way toward enhancing national security while also helping the environment. Two recent studies from the lab of Prof. Menachem Elimelech offer perspectives ...
Jul 24, 2023
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34
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
