Such a conclusion has been made by specialists of the Republican State Enterprise “National Center for Mineral Raw Materials Complex Recycling of Republic of Kazakhstan” with participation of their colleagues from the A.V. Topchiev Institute of Petrochemical Synthesis (Russian Academy of Sciences).
Contemporary production of rubber and other plastic materials uses filling agents, which improve properties of the material. Among others, technical carbon or carbon white (hydrated silicon o?ide) are used as filling agents for rubber. Recent years witnessed significant raise of interest to creating composite materials with filling agents made of carbonic and siliceous nanostructures. A rather promising source of raw materials for their receiving is large-tonnage waste of rice production – rice husk, which includes polysacharides, lignine, neutral and tarry matter and silicon dioxide. High-clean silicon dioxide, silicon carbide and silicon are already produced from rice husk. Now, it is time to get a nanostructural silicocarbonous material.
To make a filling agent from rice husk, the raw material is to be carbonized, i.e., the carbon content should be increased in it. When selecting optimal conditions, the researchers exposed rice husk to thermal decomposition in the temperature interval of 450 to 1,000ºC at the heating rate of 15 to 20ºC per minute in the atmosphere of outlet gases, controlling the output and content of obtained solid products. As temperature increases, the silicocarbonous material output decreases, the organic carbon content remains practically constant, and the silicon dioxide content rises. Tests have shown that it is better to process rice husk at the temperature of 650ºC. Under these conditions, nanodimensional particles of amorphous carbon and silicon dioxide are received, which are easily distributed in the caoutchouc matrix and improve rubber compound’s processing characteristics, including durability and plasticity. Tire rubber and general mechanical rubber goods with application of carbonizers from rice husk and its derivatives as a filling agent exceed by quality analogous products manufactured with technical carbon or carbon white. Besides, new silicocarbonous filling agents (due to higher content of hydrocarbon phases) enable to reduce plasticizer consumption or to do without it at all.
The obtained results allow to consider carbonizers from rice husk and its derivatives as promising nanostructural filling agents for elastomers.
Olga Myznikova | alfa
Light green plants save nitrogen without sacrificing photosynthetic efficiency
21.11.2017 | Carl R. Woese Institute for Genomic Biology, University of Illinois at Urbana-Champaign
Filling intercropping info gap
16.11.2017 | American Society of Agronomy
The WHO reports an estimated 429,000 malaria deaths each year. The disease mostly affects tropical and subtropical regions and in particular the African continent. The Fraunhofer Institute for Silicate Research ISC teamed up with the Fraunhofer Institute for Molecular Biology and Applied Ecology IME and the Institute of Tropical Medicine at the University of Tübingen for a new test method to detect malaria parasites in blood. The idea of the research project “NanoFRET” is to develop a highly sensitive and reliable rapid diagnostic test so that patient treatment can begin as early as possible.
Malaria is caused by parasites transmitted by mosquito bite. The most dangerous form of malaria is malaria tropica. Left untreated, it is fatal in most cases....
The formation of stars in distant galaxies is still largely unexplored. For the first time, astron-omers at the University of Geneva have now been able to closely observe a star system six billion light-years away. In doing so, they are confirming earlier simulations made by the University of Zurich. One special effect is made possible by the multiple reflections of images that run through the cosmos like a snake.
Today, astronomers have a pretty accurate idea of how stars were formed in the recent cosmic past. But do these laws also apply to older galaxies? For around a...
Just because someone is smart and well-motivated doesn't mean he or she can learn the visual skills needed to excel at tasks like matching fingerprints, interpreting medical X-rays, keeping track of aircraft on radar displays or forensic face matching.
That is the implication of a new study which shows for the first time that there is a broad range of differences in people's visual ability and that these...
Computer Tomography (CT) is a standard procedure in hospitals, but so far, the technology has not been suitable for imaging extremely small objects. In PNAS, a team from the Technical University of Munich (TUM) describes a Nano-CT device that creates three-dimensional x-ray images at resolutions up to 100 nanometers. The first test application: Together with colleagues from the University of Kassel and Helmholtz-Zentrum Geesthacht the researchers analyzed the locomotory system of a velvet worm.
During a CT analysis, the object under investigation is x-rayed and a detector measures the respective amount of radiation absorbed from various angles....
The quantum world is fragile; error correction codes are needed to protect the information stored in a quantum object from the deteriorating effects of noise. Quantum physicists in Innsbruck have developed a protocol to pass quantum information between differently encoded building blocks of a future quantum computer, such as processors and memories. Scientists may use this protocol in the future to build a data bus for quantum computers. The researchers have published their work in the journal Nature Communications.
Future quantum computers will be able to solve problems where conventional computers fail today. We are still far away from any large-scale implementation,...
15.11.2017 | Event News
15.11.2017 | Event News
30.10.2017 | Event News
22.11.2017 | Business and Finance
22.11.2017 | Physics and Astronomy
22.11.2017 | Physics and Astronomy