Desalination of seawater based on a nanofiber membrane. Free Technical Library News

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Desalination of sea water based on nanofiber membrane

06.07.2021

Korean scientists have created a desalination method that can make seawater drinkable in minutes. To do this, they used a membrane distillation process.

Thanks to the method of membrane distillation, scientists were able to remove 99,9% of the salt from the water within one month. However, the main problem in developing this method was that such filters stop filtering water after the membrane gets wet, so it was necessary to create a material that would be as resistant to moisture as possible. And at the same time, it must retain the ability to filter water. As a result, the membrane was made of polymer nanofibers, which are made by electrospinning, when the threads of the membrane fiber are formed in an electrostatic field.

The scientists used a polymer blend of polyvinylidene fluoride and hexafluoropropylene as a base and a silicate airgel mixed with a low concentration polymer as a shell to produce a composite membrane with a superhydrophobic surface. If commercialized, this solution could help alleviate the drinking water crisis exacerbated by climate change, as it is less energy-intensive.

Most modern desalination plants consume a large amount of energy for their operation. In addition, as a result of the operation of desalination stations, brine remains in the residue, which is then poured back into the seas and oceans. According to the UN, more than 3 billion people around the world suffer from water scarcity.

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Black box for man 18.10.2003

Newly founded American company "Bodymedia" specializes in technical means of tracking human health.

The bracelet, designed by the company, is worn on the arm above the elbow. Inside the device weighing 85 grams are sensors for motion, temperature, pulse and electrical resistance of the skin.

The device for five days records the pulse rate, skin temperature, its resistance (it indicates the release of sweat), the temperature of the air near the skin (which allows you to calculate the release of heat by a person) and physical activity. All this data is then transferred wirelessly to a computer and sent via the Internet to a doctor who makes recommendations for lifestyle changes.

The recorded parameters allow you to notice, for example, hypodynamia or restless sleep of the wearer of the bracelet, not to mention an increase in temperature or heartbeat.

In the future, the company intends to add some other sensors to the device, such as blood pressure.

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