N
N. P. Shapkin
Researcher at Far Eastern Federal University
Publications - 45
Citations - 185
N. P. Shapkin is an academic researcher from Far Eastern Federal University. The author has contributed to research in topics: Specific surface area & Positron annihilation spectroscopy. The author has an hindex of 6, co-authored 45 publications receiving 126 citations.
Papers
More filters
Journal ArticleDOI
Reactive Spark Plasma Synthesis of Porous Bioceramic Wollastonite
E. K. Papynov,E. K. Papynov,Oleg O. Shichalin,I. Yu. Buravlev,I. Yu. Buravlev,A.S. Portnyagin,A.A. Belov,A.A. Belov,V. Yu. Maiorov,Yu. E. Skurikhina,E. B. Merkulov,V. O. Glavinskaya,V. O. Glavinskaya,A. D. Nomerovskii,A. D. Nomerovskii,A. V. Golub,N. P. Shapkin +16 more
TL;DR: In this article, a reactive spark plasma synthesis (R-SPS) method was proposed for the synthesis of a porous (Ssp = 12.7-8.56 m2/g) and structurally strong composite material based on wollastonite (CaSiO3) containing 20 wt % hydroxyapatite (HAP).
Journal ArticleDOI
Composition and structure of amorphous silica produced from rice husk and straw
L. A. Zemnukhova,A. E. Panasenko,E. A. Tsoi,G. A. Fedorishcheva,N. P. Shapkin,A. P. Artem’yanov,V. Yu. Maiorov +6 more
TL;DR: In this paper, the effect of the nature of raw materials and processing procedure on the physicochemical properties of amorphous silica is examined, and the porosity of the samples has been evaluated by different techniques: nitrogen desorption (Barrett-Joyner-Halenda method), water vapor adsorption, sorption of organic dyes (methylene blue and brilliant green), and positron annihilation spectroscopy.
Journal ArticleDOI
Organomodified aluminosilicates as friction geomodifiers
TL;DR: In this paper, the effect of chitosan-modified natural silicates on tribotechnical characteristics of additives and formation of a surface layer in friction of surfaces was studied.
Journal ArticleDOI
Polyvinyl- and polyphenylsilsesquioxanes and their films: an investigation by X-ray diffractometry, positron diagnostics, and 29Si NMR spectroscopy
N. P. Shapkin,Yu. N. Kulchin,V. I. Razov,S. S. Voznesenskii,V. V. Bazhenov,M. V. Tutov,N. N. Stavnistyi,Valery G. Kuryavyi,Arseny B. Slobodyuk +8 more
TL;DR: In this paper, the cross section surface areas of polyvinyl-silsesquioxane chains were measured and the sizes of "traps" of the free and ordered volumes and the ratio of the T2 and T3 units in (RSiO1,5) was determined by time positron diagnostics, 29Si NMR spectroscopy, and X-ray diffractometry.
Journal ArticleDOI
Spark Plasma Sintering-Reactive Synthesis of SiC and SiC–HfB2 Ceramics Based on Natural Renewable Raw Materials
N. P. Shapkin,E. K. Papynov,E. K. Papynov,Oleg O. Shichalin,Oleg O. Shichalin,I. Yu. Buravlev,I. Yu. Buravlev,Elizaveta P. Simonenko,N. P. Simonenko,A.P. Zavjalov,A.A. Belov,A.A. Belov,A.S. Portnyagin,A.S. Portnyagin,Andrey V. Gerasimenko,A. N. Dran’kov,A. N. Dran’kov +16 more
TL;DR: In this paper, an original method for producing a ceramic material based on silicon carbide and its composite with the addition of hafnium diboride (SiC-HfB2) from organic raw materials of natural origin is presented.