Journal "Scientific Israel Technological Advantages" ,vol.14,2012

Journal "Scientific Israel- Technological Advantages" Vol.14 no. 1, 2012

NANOSTRUCTURED BINDER FOR ACID-RESISTING BUILDING MATERIALS

O.Figovsky-1, Yu. Borisov-2, D.Beilin-1

1-Polymate Ltd, International Nanotechnology Center, Migdal HaEmek, Israel, 2- Voronezh State University of Architecture and Civil Engineering, sita1@netvision.net.il

ABSTRACT

Acid-resting building materials based on liquid glass find wide application in construction as silicate polymer concretes, filler pasties, putties, etc Significant increase in strength, heat- and fire resistance of silicate matrix was achieved by introducing into the composition the tetrafurfuryl esters of orthosilic acid (tetrafurfuryloxisilane- TFS). Introduction the TFS additive into binding medium leads to formation of nanoparticles SiO2 which acts as nucleation centers of crystallization, and furfural alcohol which fills silicate matrix and forms a cross-linked polymer. The developed nanostructured binder provided the basis for obtaining the acid resistant silicate polymer concrete and void fillers .

ALTERNATIVE TECHNOLOGY OF MULTIPLE INCREASING THE LEVEL OF CONSUMER PROPERTIES OF CONVENTIONAL MATERIALS ENGINEERING AND FUNCTIONAL PURPOSE

G.Volkov

Moscow State Technical University ,Moscow, Russia, recom.moscow@gmail.com

ABSTRACT

The final part of modern nanotechnologies is nanoparticles, which couldn't be used as engineering material. Complicated multistage technologies are used for its compacting, which makes production cycle much longer and incerases the cost of obtained bulk material. This calles into question its technical application. We are offering technology of one stage formation of bulk nanomaterials. This technology is experimentally proved on model system carbon-carbon. The material consists of carbon nanoparticles 10 nm in diameter, bind with nanosized carbon matrix and is producing as pips and plates with dimensions up to 200mm. Nanomaterial exceeds carbon materials of traditional technologies on consumer properties up to 300 times. Unique properties of carbon nanomaterial are supported by existance of industrial production and implemented in technical devices with above-world-level properties. The offering technology of bulk nanomaterials forming in one stage process can be modified for producting of materials with properties above achieved level from the raw material of any other chemical composition using gas-phase, liquid- and solid-phase crystallization processes.

 

NANOSTRUCTURES: INVESTIGATION Of THE SPECIAL PHYSICAL PROPERTIES

O. Figovsky-1, D. Pashin, I. Nasyrov, Z. Khalitov, E. Semenov , D. Valeeva- 2, M.Khusainov- 2,3, Yu.Proshin-3

1 -Polymate Ltd., International Nanotechnology Research Center, Migdal HaEmek, Israel, 2- Kazan State Technical University, 3-Kazan State Technical University, Kazan, Russia, pashin@addnano.ru

Contents

1.Structure and diffraction by radial cylindrical crystals: two-dimensional case

2,Simulation of the Fresnel d    Diffraction in a hole of nanotube

3.Superconducting spintronic devices based on ferromagnet / superconductor nanostructures

1. Structure and diffraction by radial cylindrical crystals: two-dimensional case

ABSTRACT

The formation of radial cylindrical crystals is possible at precipitation atoms on a cylindrical substrate. The structure and diffraction by two-dimensional ideal radial crystal is considered. The specific diffraction effect – an essential dependence of position of some reflexes on the size of crystal, is found. The basic differences from a case of layer nanotube are revealed.

2. Simulation of the Fresnel diffraction in a hole of nanotube

ABSTRACT

Spectral dependences and distributions of diffraction intensity of short-wave radiation (x-ray, particles of corresponding energies) by non-chiral, chiral, spiral and radial lattices in internal hole of nanotube are calculated. The significant increase of intensity, diffracted by some kinds of nanotubes at characteristic lengths of waves, is shown. Differences and abnormal character of radiation propagation through the hole are determined.

3. Superconducting spintronic devices baserd on ferromagnet/superconductor nanostructuires

ABSTRACT

The layered nanostructures ferromagnet / superconductor (F/S) due to combination of incompatible in homogeneous materials properties are the most perspective materials for use in the new field of electronics – a superconducting spintronics. A new type of logical devices based on the layered F/S nanostructures and combining the advantages of the superconducting and magnetic recording channels in one sample is offered. Each channel can be separately controlled by weak magnetic field or current pulse and the switching time is of order of 10-10 – 10-11 s. The realization of such devices on base of high-temperature superconductors will allow using cheap nitrogen instead of expensive helium for cooling.

 

Journal "Scientific Israel- Technological Advantages" Vol.14 no. 2-3, 2012

DURABILITY AND DEFORMABILITY OF REINFORCED CONCRETE BENDING STRUCTURES STRENGTHENED BY POLYMERIC COMPOSITES

I. S. Surovtsev , Y. M. Borisov

Voronezh State University of Architecture and Civil Engineering, Voronezh, Russia, rector@vgasu.vrn.ru

ABSTRACT

The paper is devoted to the experimental investigation of the actual behavior of reinforced concrete beams strengthened by polymeric composite materials in bending. Such technology allows to avoid the risk of ignition and fire in case of traditional methods of strengthening using welding.

 

BEHAVIOUR OF CONCRETE STRUCTURES UPON THE IMPACT OF UV AND RAIN OF NATURAL ACIDITY pH

R. Wasserman

Western Galilee Academic College, Acre, Israel, wassermn@gmail.com

ABSTRACT

A common basic assumption in civil engineering is that rainwater is chemically neutral (pH = 7.0). However, even under pristine conditions, rainwater is often more acidic due to natural emissions of organic acids. Even natural rain acidity may be very aggressive against natural stones and concrete. A harmful impact of UV radiation on the concrete durability was discussed by the authors for the first time in 2006. The objective of the current research was the characterization of weathering processes occurred in the wet cast concrete subjected to the normal acidic rain and UV radiation, and the evaluation of their possible effect on the reinforced concrete durability. It was revealed that organic acids contained in rain of the natural acidity promote an intense concrete carbonation, even when a permeability of concrete looks to be low.

 

QUANTITATIVE ACOUSTIC EMISSION NON-DESTRUCTIVE INSPECTION METHOD AND IT APPLICATION FOR REVEALING, TYPIFYING AND ASSESSING FLAWS IN SPECIMENS PREPARED BY LASER SINTERING

G. Muravin, B. Muravin

 Integrity Diagnostics Ltd., Netanya, Israel, gm@.muravin.com

ABSTRACT

Quantitative Acoustic Emission Non-Destructive Inspection (QAE NDI) technology, photo-elastic, optical and electron fractography methods were used for:

- Revealing, typifying, and assessing flaws in specimens prepared by laser sintering.

- Determination of non-uniformity of powder melting, appearance of secondary micro- cracks during macro- crack development, and other disadvantages of technological processes.

- Establishing interdependence between the J-integral values of the revealed flaw, design criteria acceptable J-integral values of flaws for specific specimens and criteria for rejecting specimens from operation.

- The optimal intervals (steps) of laser beam displacement.

It was also established that the main crack in a system of micro-cracks under dynamic loading could start to propagate earlier and faster, and for greater lengths than an individual main crack. These accompanied by specific variations of the characteristics of AE signals, increase in the J-integral value of the main crack and a significant decrease resistance specimens to fracturing.

 

Journal "Scientific Israel- Technological Advantages", Vol.14 no. 4, 2012

NANOSTRUCTURES: INVESTIGATION Of THE SPECIAL PHYSICAL PROPERTIES

(Continuation. Beginning is in SITA-Journal v.14, no.1, 2012)

O. Figovsky-1, D. Pashin, Z. Khalitov, D. Valeeva, A. Chkanov, A. Khadiev-2

1- Polymate Ltd., International Nanotechnology Research Center, Migdal HaEmek, Israel, 2-Kazan State Technical University, ashin@addnano.ru

Contents

4. The peculiarities of structure and Diffraction by Misfit Mixed-Layer Nanotubes

5. The Quantitative Theory of Diffraction by Spiral Nanotubes

 

4. The peculiarities of structure and diffraction by misfit  mixed-layer nasnotubes

ABSTRACT

The analysis of diffraction by separate mixed-layer goffered nanotube's lattice is offered. Two extreme cases of the large and small size of coherent scattering regions (CSR) in a radial direction are considered. The qualitative explanation of observed diffraction effects is given.

5. The quantitative theory of diffrtaction buy spiral nanotubes

ABSTRACT

The quantitate ive theory of diffraction by spiral nanotubes of any chemical composition is offered. Distribution of diffraction intensities along layer lines and layer planes, strong and diffuse reflexes, pseudoorthogonality effect has been simulated and analyzed. The investigation is oriented to electron microdiffraction from a single nanotube.

 

FRACTURE AND CRACK RESISTANCE OF SILICATE POLYMER CONCRETE

O.Figovsky-1, D. Beilin-1, Yu. Zemlyanushnov-2

1- Polymate Ltd- International Nanotechnology Research Center. Migdal HaEmek, Israel, 2- Moscow State University of Civil Engineering, Moscow, Russia, sita1@netvision.net.il

ABSTRACT

The important quality of SPS's products and structures is the resistance to occurrence and development of cracks. This paper deals with experimental and theoretical study of fracture and crack resistance of SPC and is continuation and development of preceding works of authors.

 

OSCILLATION THEORY OF HETEROGENEOUS CATALYSIS AND ITS USE FOR IDENTIFICATION OF THE REACTION SCHEME AND KINETICS: CATALYTIC LIQUID-PHASE BENZENE-RING HYDROGENATION AS AN EXAMPLE

V.E. Ostrovskii

Karpov Institute of Physical Chemistry, Moscow, Russia; vostrov@cc.nifhi.ac.ru;ostrovskii.victor@mail.ru

ABSTRACT

The heterogeneous-catalysis oscillation theory given earlier by us only briefly is grounded and detailed. The oscillation theory bears on the following available conclusions made in the last decades: thermally-stabilized surfaces are homogeneous, chemisorbed layers are of island structure, and the rates of chemisorption are multifold higher than the rates of catalysis. According to the oscillation theory, any surface reveals itself under stationary catalysis as a single whole rather than as a conglomerate of catalytically active centers that "work" independently of one another. The start of a reaction run, which begins from an act of chemisorption of a source molecule at one of the surface centers, leads to a shift of the gas/surface equilibrium over the entire crystal surface and to a chemical act of any other chemical nature at another surface center etc. up to desorption of a product molecule from a center distant from the first and second ones. The surfaces are covered with two-dimensional island chemadphases, each consisting of a multitude of chemadmolecules, and any catalytic process includes a rate-determining step (RDS) and a residual equilibrium portion; therewith, the knowledge of the chemical natures of the RDS and of all chemadphases, which occur at the surface, is necessary and sufficient for deduction of the kinetic equation for the process. As an example, an original reaction scheme for the heterogeneous catalytic liquid-phase benzene-ring hydrogenation in benzene-substituted substances at Ni, Pt, Pd, Ru, Ir, and Rh catalysts is proposed on the oscillation theory basis and the procedure of kinetic-equation deduction is considered. The resulted kinetic equation is capable of describing all kinetic dependences describable by the available kinetic equations and has additional possibilities.

 

NONISOCYANATE POLYURETHANES BASED ON CYCLIC CARBONATES  AND NANOSTRUCTURED COMPOSITES

O. Figovsky, L. Shapovalov, A. Leykin, O. Birukova, R. Potashnikova

Polymate Ltd. – International Nanotechnology Research Center, Migdal HaEmek, Israel , contact@polymateltd.com

ABSTRACT

The article reviews production and application of the nonisocyanate polyurethanes based on cyclic carbonate oligomers. Nonisocyanate polyurethane (NIPU) networks are obtained by reaction between the polycyclic carbonate oligomers and aliphatic or cycloaliphatic polyamines with primary amino groups. This results into formation of the crosslinked polymer with β-hydroxyurethane groups of different structure defined as polyhydroxyurethane polymer. The article discusses NIPU and hybrid NIPU (HNIPU), which contains also epoxy and acrylic compounds. Significant attention was paid to the formation of the materials based on renewable raw materials. The authors provide an overview of the recent publications in this field with a more detailed description of the Polymate Ltd. achievements.