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Researchers from India extract graphene from flowers

A team of scientists from the Center for Materials for Electronics Technology (C-MET) and Savitribai Phule Pune University (SPPU) in India has reportedly managed to extract graphene from wild flowers (bougainvillea vines). According to the scientists at C-MET and SPPU, these flowers, when dried and chemically treated, can be used to extract graphene. The team has fabricated supercapacitors using the produced graphene, and is now undertaking final trials of their performance. The experiment involved programmed heating of the dried petals, at temperatures ranging from 250 degrees Celsius to 1,000 degrees Celsius.

New electrolytic capacitors from RS components

RS Components has announced availability of 2 new series of high-performance electrolytic capacitors manufactured by Panasonic. Offering excellent characteristics for a wide variety of applications, the V-TC and V-TCU series of aluminium electrolytic capacitors are specialised miniaturised components offering ripple current and high capacitance. The V-TC and V-TCU series are based on the proven V-TP series from Panasonic, but benefit from 1.2 to 1.5 times higher ripple current capabilities at +125C. In addition, the V-TCU parts also offer 1.2 to 2.2 times larger capacitance values, ranging from 220µF up to 680µF, while also downsizing by one aluminium-can size, for example from G to F size or from F to D8. The surface-mount capacitors feature a footprint ranging from 6.3 x 7.7mm up to 10mm x 10.2mm, and typical lifetimes of 2000 hours for smaller can sizes and 3000 hours for larger devices. 

New metallized polypropylene AC filtering film capacitors by Vishay

Vishay Intertechnology has introduced a new series of metallized polypropylene AC filtering film capacitors optimized for high humidity environments. The Vishay Roederstein MKP1847H is the industry’s first full-range AC filtering film capacitor series to withstand demanding temperature humidity bias (THB) testing, 85C, 85% RH for 1,000 hours at rated voltage, without altering its electrical characteristics. The capacitors released today are designed to ensure extremely stable capacitance and ESR values over a long service life under harsh environmental conditions during operation. The robust devices are ideal for input and output filtering in outdoor renewable energy inverters and critical applications such as UPS for sensitive datacenters. The capacitors feature segmented film and offer rated capacitance from 1µF to 35µF and low ESR down to 3m ohm. The devices provide high ripple current capabilities up to 24.5A and rated voltages of 250VAC, 310 VAC, 350 VAC, and 480VAC.

New batteries that can run on ultra-low temperatures

Engineers at the University of California San Diego have developed a breakthrough in electrolyte chemistry that enables lithium batteries to run at temperatures as low as -60 degrees Celsius with excellent performance, in comparison, today’s lithium-ion batteries stop working at -20 degrees Celsius. The new electrolytes also enable electrochemical capacitors to run as low as -80 degrees Celsius, their current low temperature limit is -40 degrees Celsius. While the technology enables extreme low temperature operation, high performance at room temperature is still maintained. The new electrolyte chemistry could also increase the energy density and improve the safety of lithium batteries and electrochemical capacitors. The work is published online by the journal Science on 15 June, 2017. 


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