Obtaining Nanofibers Na-CMC in Mechanomagnetic Activated Water Solution for the Purpose of Reinforcing Concrete Structure

The authors have studied the impact of mechanomagnetic activation (MMA) of the solutions NA-CMC, widely used for mixing water-cement paste, on the structure and properties of cement composites. By the method of dynamic light scattering, the appearance of nanosize particles of grouting fluid’s dispersion phase has been proved. On the base of the results of X-ray diffraction analysis, there have been found alterations of cement stone structure; the influence of MMA on the processes of structure formation has been proved; the principal components of cement stone structure have been identified.

Nanotechnology for Air Remediation

The world around us is a gift of God. A thrust to know and reconnoiter the environment around us is innate. Man has drastically explored and utilized the resources hidden in nature, but unfortunately in this sprint of development, the natural environment is severely affected. It is the need of the hour to focus on methodologies for environmental remediation. Many technologies have been developed to reduce the pollution causing factors. Use of nanotechnology for the sake of saving environment is an emerging field. Nano-technology is based on nano-sized (smaller than 1 micron) materials. Nanosize particles have initiated the advancement in new and low cost techniques for environmental pollution control including air pollution.

Comment on the paper ‘Shape effect of nanosize particles in unsteady mixed convection flow of nanofluid over disk with entropy generation’

The present comment concerns some doubtful results included in the paper ‘Shape effect of nanosize particles in unsteady mixed convection flow of nanofluid over disk with entropy generation’.

Research of Concentrations of Ultrafine and Finely Dispersed Aerosols in the Atmosphere of a Southern Urals Mining Region

Until now the world has not had a consistent standard establishing the maximum permissible concentrations of aerosols, that is, of nanosize particles in the air. At the same time, in the foreign literature it is proved that nanoparticles upon deposition in the human lungs may stay there for longer time than larger-size particles because of a more complicated process of a human body self-cleansing and stronger interaction of such particles with human body tissues and organs. Some types of nanosize particles (for instance, titanium or carbon dioxides) more easily penetrate the barrier layer of an epithelial cell and enter interstitial tissue or blood flow. The article presents the results of a pioneering research into concentrations of ultrafine and finely dispersed aerosols in the atmosphere of a mining region. The available literature data on concentrations of submicron-size particles (0.5-5 μm) in the atmosphere of mining regions and operating areas of underground mines and open pits cannot be referred to as nanoparticles. They must be classified as medium and coarse aerosols having a radically different effect on a human body. The studies are performed with the supportof the Russian Science Foundation (Project No14-37-00050)

INVESTIGATIONS INTO NANOSCALE PARTICLES AS PART OF INDUSTRIAL AEROSOLS AND PARTICULATE MATTER IN THE AIR OF WORKING AREA

Results of practical researches in the working area of mining, rubber and chemical industries in respect to the nanoscale particles content are reported. For reference, the air of the workplace of management and white-collars employees not involved in the production process was investigated. Research results are shown in the form of nanoparticles number concentration using peak particle distribution in cm3 and nanosize particles range, which accounts for the peak distribution, nm. For each kind of production. jobs with the highest possible characteristics in respect to the workplace to be compared to were set. Investigations reported can be used in assessing working conditions and occupational risks of exposure to nanomaterials in production processes as well as in manufacturing processes with nanoparticles formotion.