New Technologies for Producing Multifunctional Reinforced Carbon Plastics

In this article we investigated properties of elementary carbon fibers after their activation and subsequent deposition of thin layers of metal coatings on their surface. For deposition we used copper, titanium and stainless steel. We investigated influence of various technologies of preliminary processing of the fiber surface on the value of the adhesion strength of the metal coating to the carbon tape and on the mechanical properties of elementary fibers. We established that the strength of carbon plastics at interlayer shear increases by 10-30% when using carbon tapes and fabrics with a metal coating.

Kinetics study of spreading processes of epoxy binders on carbon cloth surface with metal coating

The results of experimental studies of kinetics of spreading processes of epoxy binders on the surface of a carbon (cloth) tape depending on a reinforcement pattern are presented. A copper coating of 100 nm thickness was deposited on reinforced materials by magnetron sputtering. It has been found out that a metal coating on the surface of a carbon tape and cloth leads to a considerable increase in the rate of spreading processes only for the laying-out pattern 0°, when binder movement in capillaries is provided. The deposition of a copper coating on the surface of the carbon tape and cloth has considerably the bigger influence on kinetics of the spreading processes, increasing it by 35%.

Investigation of structure and properties of elemental carbon fibers with metal coating

Four types of metal coatings made of stainless steel, silver, titanium and copper were deposited on the surface of unidirectional carbon tape by the magnetron sputtering technology. The experimental evaluation results of strength of elemental carbon fibers with the metal coatings and strength of carbon-filled plastics based on them during the interlaminar displacement are presented. When producing the carbon-filled plastics an epoxy binder and the vacuum infusion technology were used. It has been found out that all the used metal coatings lead to an increase in strength of the carbon-filled plastics during the interlaminar displacement. The carbon tape with the stainless steel coating has the highest strength increase (by 50%). However, during long-term storage, the coating effectiveness of the metalized carbon tapes decreases.

Comparative Performance of Four Electrodes for Measuring the Electromechanical Response of Self-Damage Detecting Concrete under Tensile Load

Self-damage or/and stress-sensing concrete is a promising area of research for measuring the electromechanical response of structural materials using more robust sensors. However, the copper and silver paste sensors widely used in such applications can be expensive and have detrimental effects on the load carrying capacity and durability of the structural systems upon which they are installed. Accordingly, this study compared the performance of four electrode types—conventional copper tape with silver paste (CS), copper film with type 1 carbon tape (CC1), copper film with type 2 carbon tape (CC2), and copper wire and film with type 2 carbon tape (WC2)—to develop an economical and practical electrode for measuring the electromechanical response of self-damage-detecting concrete. The CC1 electrode exhibited comparable performance to the CS electrode in measuring the electromechanical response of self-damage-detecting concrete, despite requiring a longer polarization time (80 s) than the CS electrode (25 s). The CS electrode exhibited a higher damage-sensing capacity (GF2), whereas the CC1 electrode exhibited a higher strain-sensing capacity (GF1), as well as good damage-sensing capacity. Therefore, the CC1 electrode using copper film with type 1 carbon tape was determined to be the best alternative to the conventional CS electrode.

Partículas ambientales en bronquio y tejido pulmonar humano

Objectives. Identify environmental particles in bronchus and human lung tissue through the SEM technique Methodology. The samples were fixed by immersion in 2% glutaraldehyde for 2 hours, then a wash with 1x pH 7 phosphate buffer and light agitation (x3) (1x, 2x and x3) was performed. Finally, the samples were critically dried out with a Samdri 795 team from Tousimis. This was the process to which the samples were taken for EDS analysis with a Jeol JSM 6610LV equipment, operating at 10kV, with Oxford Xmax EDS detector and Oxford AZtec software. The observation in the scanning electron microscope was performed with secondary electron detector. For the assembly, a sample holder was used for scanning electron microscopy, on a double-sided carbon tape substrate. The samples were given a coating with conductive material (99.9% gold) by sputtering with the Denton Vacuum V equipment. Contribution. In lung, 21 elements were identified, in addition to observing the shape and size of the particles. These images were compared with some other environmental particles presented by diverse authors. The uses of these elements were consulted and it was identified that some of them are used in the automotive, electrical and medical industries, and they also have a great influence on food.