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Production of AAC in Russia: history, present stage, perspectives

100%

Levchenko V.

2011

tom nr spec.

125-127

The history of cellular concrete production in the USSR and Russia is recounted. Currently there are 52 AAC plants in Russia, with the capacity of over 30 thousand cubic meters, other 21 plants are being constructed and prepared to start. Autoclaved aerated concrete has a significant portion of the construction market and has great prospects. In 2008 the Autoc!aved Aerated Concrete Producers Association has been founded for producers to bring together, to create standard documentation, to share experience and to meet other challenges.

Formation and structural characterization of silver nanoparticles in ormosil sol-gel films

51%

Reisfeld R. , Saraidarov T. , Levchenko V.

Optica Applicata

2008

tom Vol. 38, nr 1

83-92

Silver nanoparticles were obtained in situ in ormosil sol-gel films with attached urethane groups. Optical spectra of the silver nanoparticles in the films show red shift of absorption maximum with increasing silver concentration from 2% to 10%. In the solutions lambda max is shifted from 390 nm till 425 nm; in the films lambda max is shifted from 438 nm till 456 nm. Structural characterizations of the composite sol-gel films incorporated by silver nanocrystals have been studied by: scanning electron microscopy (SEM), atomic force microscope (AFM), energy dispersion X-rays analysis (EDAX), high resolution transmission electron microscopy (HRTEM), selected area electron diffraction (SAED) and scanning transmission electron microscopy (STEM). Two types of silver nanoparticles with sizes of 1-2 nm and 20-40 nm were observed. The crystal grow process and particle sizes depend on the starting concentrations of silver ions, reaction temperature and time. The small silver particles are arranged in micro pores of the matrix, as shown from STEM images. SAED confirms the silver face-centered cubic crystal lattice.