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Search by tag «Nanoparticles» 20 results
Fluorescent carbon nanoparticles, also known as carbon dots, were first described in the early ‘00s. But even today, scientists around the globe still have not reached a consensus on their inner structure and emission process. Carbon dots have a great deal of potential applications due to their biocompatibility with the human body and the ease and low cost of their production as compared to semiconductor quantum dots. Researchers from ITMO University have published two research papers in which they put forth their answers to the burning questions about carbon dots.
ITMO University scientists in collaboration with their colleagues from the Swedish University of Agricultural Sciences (SLU University), Uppsala, Sweden, have developed biocomposites made of proteins based on natural spider silk and optically active nanoparticles. What is remarkable about the new material is that it combines the properties of natural silk fiber and synthetic particles. The biocomposite has unique mechanical characteristics and can give a detectable optical response when exposed to infrared radiation, which makes it a potential candidate for biomedical applications. This article was published in ACS Applied Materials & Interfaces.
An international team of physicists has produced first evidence of particles capable of scattering light in lateral direction by suppressing forward and backward scattering. The researchers studied the physics behind this phenomenon and confirmed their theoretical results with an experiment in the microwave spectral range, proving that lattices or metasurfaces made of these materials can be completely invisible. These results can be used in a variety of applications including light routing, binary-coded holograms, and sensors. The study was published in Physical Review Letters.
Ksenia Mosina, a Master’s student at ITMO University’s SCAMT Laboratory, went to Canada as part of her student exchange program to participate in research on the synthesis of gold core-shell nanoparticles for biosensing and photocatalysis. The results of the research were published in Nanoscale. In this interview with ITMO.NEWS, Ksenia shares about her experiences and the skills she acquired in the Canadian laboratory.
A team of ITMO University scientists and their international colleagues has developed a method of reversible adjustment of the nanosized light sources radiation color. While earlier studies suggested that the radiation color could only be specified during the nanoparticle synthesis stage, the new research reveals that it also can be changed in fully-formed particles. Stability and electromagnetic resonances of the particles are retained during this adjustment, which opens new possibilities for production of optical chips, LEDs, and optoelectronic devices. The findings are published in Nano Letters.
An international research team has studied a new cell visualisation and drug delivery system based on nanoparticles coated with luminescent dye molecules. Scientists have found out that the particle material and the distance between the dye and the particle’s surface affect the intensity of the luminescent signal. It turned out that silicon nanoparticles coated with dye molecules are more efficient than similar particles made of gold. Thanks to their biocompatibility, silicon particles can be used for cell visualisation and drug delivery. The research was published in Scientific Reports.
Physicists from ITMO University and Australian National University have developed the first-ever controlled nanodiamond-based light source. Experiments have shown that diamond shells can double the emission speed of light sources and help control them without any additional nano- and microstructures. This result was achieved due to artificially created defects in the diamonds’ crystal lattice. Results of this research are important for the development of quantum computers and optical networks. The study is published in Nanoscale.
Russian scientists have developed a multifunctional nanodevice based on dielectric nanoparticles coupled with a metal film. The device can be used to measure the temperature of surrounding molecules. Experiments have also shown that heat resistance in proteins can be increased by changing the nanoparticles’ chemical properties. The resulting nanostructures are very biocompatible, which makes them potentially useful in biomedicine. The results were published in Laser & Photonics Reviewers and the Journal of Biophotonics.
Researchers from ITMO University and their international colleagues have developed the first three-dimensional dynamic model of an interaction between light and silicon nanoparticles. They used a supercomputer with graphic accelerators for the calculations. Results showed that when exposed to short, intense laser pulses, silicon particles temporarily lose their symmetry and their optical properties become strongly heterogeneous. Such a change in properties depends on particle size; therefore it can be used to control light at nanoscale and in ultrafast information processing devices. The study was published in Advanced Optical Materials.
Targeted delivery of medicine and genetic material to cells and tissue can be solved using micro- and nanoparticles of various types. Research in this field tends to be interdisciplinary and calls for collaboration between biologists, chemists and physicists. Mikhail Zyuzin, a postdoctoral researcher at ITMO University’s Faculty of Physics and Engineering, is working with colleagues from Russia and abroad to develop new methods of targeted drug delivery. He spoke with ITMO.NEWS about his research and working with other scientists.