The Air Permeability and the Porosity of Polymer Materials Based on 3D-Printed Hybrid Non-Woven Needle-Punched Fabrics.

The possibility of controlling the porosity and, as a result, the permeability of fibrous non-woven fabrics was studied. Modification of experimental samples was performed on equipment with adjustable heating and compression. It was found that the modification regimes affected the formation of the porous structure.

A New Approach to Carbon Nanotube Filament Nanostructuring for Additive Manufacturing.

A new technique of additive prototyping filament volumetric nanostructuring based on the high-speed mechanical mixing of acrylonitrile-butadiene-styrene (ABS) copolymer granules and single-walled carbon nanotube (CNT) powder (without prior dispersion in solvents) is considered. The morphological spectra of scanning electron microscopy (SEM) images of nanostructured filament slice surfaces were obtained and characterized with the original mathematical simulation. The relations of structural changes in the "ingredient-matrix" polymer system with dielectric and mechanical properties of the ABS-based filaments were established.

Formation of Molybdenum Blue Nanoparticles in the Organic Reducing Area.

Molybdenum blue dispersions were synthesized by reducing an acidic molybdate solution with glucose, hydroquinone and ascorbic acid. The influence of the H/Mo molar ratio on the rate of formation of molybdenum particles was established. For each reducing agent, were determined the rate constant and the order of the particle formation and were established the conditions for the formation of aggregative stable dispersion with the maximum concentration of particles.

Simple Synthesis of Molybdenum Carbides from Molybdenum Blue Nanoparticles.

In recent years, much attention has been paid to the development of a new flexible and variable method for molybdenum carbide (MoC) synthesis. This work reports the applicability of nano-size clusters of molybdenum blue to molybdenum carbide production by thermal treatment of molybdenum blue xerogels in an inert atmosphere. The method developed made it possible to vary the type (glucose, hydroquinone) and content of the organic reducing agent (molar ratio R/Mo).

Molybdenum-Tungsten Blue Nanoparticles as a Precursor for Ultrafine Binary Carbides.

Herein, we demonstrate a promising method for the synthesis of ultrafine carbide particles using dispersions of molybdenum-tungsten nanoparticles. Dispersions of molybdenum-tungsten blue nanoparticles with different initial molar ratios of molybdenum/tungsten were synthesized through the reduction of molybdate and tungstate ions by ascorbic acid in an acidic medium (pH = 1.0-2.

Synthesis of Microporous MoC-WC Binary Carbides by Thermal Decomposition of Molybdenum-Tungsten Blues.

Molybdenum and tungsten carbides are perspective catalytic systems. Their activity in many reactions is comparable to the activity of platinum group metals. The development of the synthesis method for of highly dispersed binary molybdenum and tungsten carbides is an important task.

Synthesis of MoC by Thermal Decomposition of Molybdenum Blue Nanoparticles.

In recent years, the development of methods for the synthesis of MoC for catalytic application has become especially important. In this work a series of MoC samples was synthesized by thermal decomposition of molybdenum blue xerogels obtained using ascorbic acid. The influence of the molar ratio reducing agent/Mo [R]/[Mo] on morphology, phase composition and characteristics of the porous structure of MoC has been established.