The mercury test of catalysts that has been used and considered universal for 100 years, turned out to be ambiguous. This conclusion was made by a group of scientists including a RUDN chemist. The group confirmed that the test required additional control experiments to verify its results. T ... more
Promising sensors for submarines, mines and spacecraft
Researchers from the Physics Department of Moscow State University and their colleagues have discovered a mechanism that allows gas sensors, based on nanocrystalline metal oxides, to work at room temperature. This invention will raise the efficiency of environmental monitoring at nuclear power plants, on submarines and spacecrafts.
Scientists have proposed a new fundamental principle of operation of hydrogen sensors. Unlike most resistive gas detectors, it does not need to be heated and only requires visible light. This discovery will significantly reduce the energy consumption of the sensor and expand its scope.
"Such sensors can be used in explosive environments or be built into mobile devices without constructing additional heat sink systems," said Alexander Ilyin, a co-author of the study, a PhD student at the Physics Department of Moscow State University.
Researchers have found out that composites based on zinc and indium oxides can significantly increase the sensitivity of the sensor to hydrogen. Physicists have also proposed an explanation for the hypersensitivity of the designed composite. In their opinion, the sensor response mechanism consists in a change in the processes of generation and recombination of nonequilibrium electrons when the composite is interacting with hydrogen. Composites with a certain structure provide a more significant change in these processes.
Samples for the sensor were made from nanocrystalline indium and zinc oxide powders. The structure and particle size were studied by the means of transmission electron microscopy and x-ray diffraction. The electrical and sensor characteristics of the structureswere studied in the new designed setup, in which the required temperature of the composite and the concentration of hydrogen were well controlled.
The obtained results would allow the scientists to develop a new type of resistive hydrogen sensor that works under additional illumination without heating. Such sensors are promising not only for effective monitoring of environmental pollution in industrial plants, but also for constant monitoring of air in closed facilities (submarines, mines, spacecraft) where the slightest change in the chemical composition can lead to human casualties.
A postgraduate student of the Faculty of Geology of MSU, working with an international scientific group, participated in chemical analysis of biomarkers -- compounds that remained after the decomposition of organic remains of the genus Beltanelliformis. These organisms populated the Earth i ... more
Specialists from the biological faculty of Moscow State University have studied the way the photoactive orange carotenoid protein (OCP) exchanges carotenoid with proteins of similar structure. The discovery will boost the development of OCP-based antioxidant drugs aimed at protecting health ... more
- 1analytica 2020: World’s leading trade fair to be held virtually
- 2Sweat for health: Sensor Patches as Fitness Trackers
- 3analytica 2020: The world’s leading trade fair extends its reach with analytica virtual
- 4Portable, point-of-care COVID-19 test could bypass the lab
- 5Researchers dramatically downsize technology for fingerprinting drugs and other chemicals
- 6Attacking tumours directly on identification
- 7Towards a cell-based interceptive medicine in Europe
- 8Giant nanomachine aids the immune system
- 9Leap forward in the fight against antibiotic resistance
- 10New device can measure toxic lead within minutes