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
Kakao in Monokultur verträgt Trockenheit besser als Kakao in Mischsystemen
18.09.2017 | Georg-August-Universität Göttingen
Ultrasound sensors make forage harvesters more reliable
28.08.2017 | Fraunhofer-Institut für Zerstörungsfreie Prüfverfahren IZFP
Plants and algae use the enzyme Rubisco to fix carbon dioxide, removing it from the atmosphere and converting it into biomass. Algae have figured out a way to increase the efficiency of carbon fixation. They gather most of their Rubisco into a ball-shaped microcompartment called the pyrenoid, which they flood with a high local concentration of carbon dioxide. A team of scientists at Princeton University, the Carnegie Institution for Science, Stanford University and the Max Plank Institute of Biochemistry have unravelled the mysteries of how the pyrenoid is assembled. These insights can help to engineer crops that remove more carbon dioxide from the atmosphere while producing more food.
A warming planet
Our brains house extremely complex neuronal circuits, whose detailed structures are still largely unknown. This is especially true for the so-called cerebral cortex of mammals, where among other things vision, thoughts or spatial orientation are being computed. Here the rules by which nerve cells are connected to each other are only partly understood. A team of scientists around Moritz Helmstaedter at the Frankfiurt Max Planck Institute for Brain Research and Helene Schmidt (Humboldt University in Berlin) have now discovered a surprisingly precise nerve cell connectivity pattern in the part of the cerebral cortex that is responsible for orienting the individual animal or human in space.
The researchers report online in Nature (Schmidt et al., 2017. Axonal synapse sorting in medial entorhinal cortex, DOI: 10.1038/nature24005) that synapses in...
Whispering gallery mode (WGM) resonators are used to make tiny micro-lasers, sensors, switches, routers and other devices. These tiny structures rely on a...
Using ultrafast flashes of laser and x-ray radiation, scientists at the Max Planck Institute of Quantum Optics (Garching, Germany) took snapshots of the briefest electron motion inside a solid material to date. The electron motion lasted only 750 billionths of the billionth of a second before it fainted, setting a new record of human capability to capture ultrafast processes inside solids!
When x-rays shine onto solid materials or large molecules, an electron is pushed away from its original place near the nucleus of the atom, leaving a hole...
For the first time, physicists have successfully imaged spiral magnetic ordering in a multiferroic material. These materials are considered highly promising candidates for future data storage media. The researchers were able to prove their findings using unique quantum sensors that were developed at Basel University and that can analyze electromagnetic fields on the nanometer scale. The results – obtained by scientists from the University of Basel’s Department of Physics, the Swiss Nanoscience Institute, the University of Montpellier and several laboratories from University Paris-Saclay – were recently published in the journal Nature.
Multiferroics are materials that simultaneously react to electric and magnetic fields. These two properties are rarely found together, and their combined...
19.09.2017 | Event News
12.09.2017 | Event News
06.09.2017 | Event News
22.09.2017 | Medical Engineering
22.09.2017 | Physics and Astronomy
22.09.2017 | Physics and Astronomy