Showing posts with label Carbon. Show all posts
Showing posts with label Carbon. Show all posts

Tuesday, 5 September 2017

Supercapacitive Performance of Porous Carbon Materials Derived from Tree Leaves


Converting Fallen Leave – Porous Carbon Material

An innovative system of converting fallen tree dried leaves to porous carbon material which could be utilised in producing high tech electronics have been found by researchers in China. Researchers have defined in a study printed in the Journal of Renewable and sustainable energy, on the procedure of converting tree leaves into a system of integrating into electrodes as active resources. Initially the dried leaves are ground into powder and thereafter heated to 220 degrees Celsius for about 12 hours which formed a powder comprised of small carbon microspheres.

The carbon microspheres are then said to be preserved with a solution of potassium hydroxide and heated on gradually increasing the temperature in sequences from 450 to 800 degrees Celsius. Due to the chemical treatment it tends to corrode the surface of the carbon microspheres which tends to make it tremendously permeable.

The concluding production which is a black carbon powder is said to have a great surface area owing to the existence of several small holes which tend to have been chemically carved on the surface of the microspheres. The great surface area provides the ultimate produce with unusual electrical properties.

Permeable Microspheres

Led by Hongfang Ma of Qilu University of Technology in Shandong, the detectives followed a succession of standard electrochemical test on the permeable carbon microspheres in order to enumerate their possibility for utilisation in electronic devices.

The current-voltage curves for these materials showed that the element tends to make exceptional capacitor. Additional tests indicated that the materials had in fact been super capacitors having precise capacitances of 367 Fards/gram.

 These were said to be over thrice the value seen in some of the graphene super capacitors. Capacitor is said to be an extensively utilised element which tends to store energy on holding a charge on two conductors, which are detached from each other with the support of an insulator.

Super capacitor tend to store 10 to 100 times the energy as an ordinary capacitor and has the tendency of accepting and delivering charges much quicker than a usual rechargeable battery. Hence super capacitive materials have the potentials for an extensive selection of energy storage essential in particular in computer technology as well as hybrid or electric vehicles.

Enhance – Electrochemical Properties

The roadsides of northern China are said to be scattered with deciduous phoenix trees which produce abundant fallen leaves during autumn and these leaves are usually burnt in the colder climate, aggravating the air pollution issue of the country.

The investigators in Shandong, China, had recently found the new system of resolving this issue by means of converting waste biomass into porous carbon materials which could be used in energy storage technology. Besides tree leaves, the team together with the others have also succeeded in changing potato waste, corn straw, pine wood, rice straw as well as other agriculture wastes into carbon electrode materials.

Professor Ma together with her colleagues expects to enhance more on the electrochemical properties of porous carbon materials by augmenting the preparation procedure and enabling fixing or adjustment of the raw materials.

Sunday, 3 January 2016

Scientists Discover New Form of Carbon Harder Than Diamonds

New Form of Q-carbon Discovered

Jay Narayan together with his colleagues discovered a new type of solid carbon known as Q-carbon that enables them to create diamond connected structures within room temperature and at ambient atmospheric pressure in the air.

 The two solid formulas or phases of carbon are graphite and diamond and this would be a new phase which the researchers believe seems to be harder than diamonds. Narayan who had authored three papers comprising of one in the Journal of Applied Physics on the work with doctoral student AnaghBhaumik, had mentioned in a statement that `they have now created a third solid phase of carbon and the only place it could be found in the natural world would be probably in the core of some planets.Together with being harder than diamonds, Q-carbon seems to be ferromagnetic, which means that it is easily magnetized and tends to glow whenever it is exposed to low levels of energy.

Narayan further adds that the strength of the Q-carbon and low work function, its inclination in releasing electrons, tends to make it very likely in the development of new electronic display technologies. He adds that Q-carbon could be used also in creating various single crystal diamond objects.

Discovery – Synthesis/Processing of Nanodiamond/Microdiamond

The researchers had mentioned in another study on the discovery in the journal APL Materials that `this discovery had opened a new chapter in synthesis and processing of nanodiamond as well as microdiamond for various application which could be ranging from abrasive powders, novel catalytic properties, myriads of biomedical and microelectonic, smart displays and nanoelectronic applications.

 In order to come up with Q-carbon, the researchers started with a substrates like sapphire, glass or a plastic polymer and the substrate is later coated with amorphous carbon. This is hit with only a lase pulse which tends to last about 200 nanoseconds. The pulse tends to cause the temperature of the carbon to stretch to 4,000 Kelvin or around 6,740 degrees Fahrenheit and thereafter rapidly cools down. The outcome of the procedure is a film of Q-carbon between 20 nanometers and 500 nanometers thick.

Two Provisional Patents Filed – Q-carbon/Diamond Creation Techniques

The cooling rate can be handled by utilising various substrates and altering the duration of the laser pulse. On changing the rate of cooling they are capable of creating diamond structures within Q-carbon. Narayan had stated that `these diamond objects tend to have a single crystalline structure which makes them stronger than polycrystalline material which is all done at room temperature and at ambient atmosphere.

 So not only does this enable them to develop new applications but the procedure tends to be comparatively economical. However, the researchers agreed that there seems to be plenty of queries with regard to Q-carbon, adding that they were still in the early stage of comprehending how to handle it.

 He had commented that they know a lot about diamond and can make diamond nanodots but they do not know yet how to make Q-carbon nanodots or microneedles and that is something which they are working on. Two provisional patents on the Q-carbon and diamond creation techniques have been filed by North Carolina State.