scholarly journals Metallization of Carbon Fibers by Double and Triple Copper Composition

2015 ◽  
Vol 16 (1) ◽  
pp. 185-192
Author(s):  
H.O. Sirenko ◽  
M.B. Skladanyuk ◽  
L.M. Soltys
Keyword(s):  
Crystal Structure ◽  
Carbon Fibers ◽  
Copper Content ◽  
Coating Process ◽  
Carbon Fibres ◽  
Application Technology ◽  
Surface Layers ◽  
Foundations Of Physics ◽  
Theoretical Foundations ◽  
Layer Coating

The theoretical foundations of physics and chemistry and application technology of single- and double-layer coating based on Cu0+Cu2O, Ni0+P, Pb0 on the surface of carbonated fibers have been reviewed. The changes of surface layers crystal structure of carbon fibres in the course of copper-plating have been investigated. The metallic coating process using modified formaldehyde and zinc technology was realized. It is established that copper content in copper – copper oxide increases when using two-layer alternately modified formaldehyde and zinc methods.

scholarly journals V-shaped switching ferroelectric liquid crystal structure stabilized by dielectric surface layers

2008 ◽  
Vol 77 (3) ◽  
Author(s):  
A. Hammarquist ◽  
K. D’Havé ◽  
M. Matuszczyk ◽  
N. A. Clark ◽  
J. E. Maclennan ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Liquid Crystal ◽  
Dielectric Surface ◽  
Ferroelectric Liquid Crystal ◽  
Surface Layers ◽  
Liquid Crystal Structure

scholarly journals Influence of Cu(NO3)2 content used in thermal shock method on the photocatalytic activity of Cu-Modified ZnO nanoparticles

2021 ◽  
Vol 5 (3) ◽  
pp. first
Author(s):  
Thế Luân Nguyễn ◽  
Tiến Khoa Lê ◽  
Châu Ngọc Hoàng ◽  
Hữu Khánh Hưng Nguyễn ◽  
Thị Kiều Xuân Huỳnh
Keyword(s):  
Crystal Structure ◽  
Methylene Blue ◽  
Photocatalytic Activity ◽  
Thermal Shock ◽  
Photoelectron Spectroscopy ◽  
Copper Content ◽  
Uv Light ◽  
Copper Nitrate ◽  
X Ray ◽  
Doped Zno

The Cu doped ZnO photocatalysts were prepared on ZnO substrate modified with copper nitrate by thermal shock method with different ratio % molar Cu : Zn = 0.3, 0.5, 1.0, 2.0 and 5.0 in order to study the impacts of copper content on the photocatalytic activity of ZnO under both UV and Vis light irradiation. The crystal structure, morphology bulk and surface were investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Their photocatalytic activities were studied via time-dependent degradation of methylene blue in aqueous solution. The results exhibit that crystal structure and morphology of Cu doped ZnO photocatalysts is not modified significally than ZnO original but surface charateristicschanged greatly. The photocatalyst was doped with copper content under 2% showed formation of Cu species. These samples perform photocatalytic activity higher than ZnO. The CuNZO-0.05-500 had the highest rate constants for methylene blue degradation (kUV = 6,901 h-1, kVIS = 0,224 h-1), which are about 2.2 times and 1.3 times higher than unmodified ZnO under UV light and Vis light, respectively. However, the CuNZO-5.0-500 which had the formation of CuO phase and unchangeable ZnO's surface has photocatalytic activity similar to pure ZnO.

The Peculiarities of Mass Transfer in the Surface Layer of Materials under Extreme Heating

2021 ◽  
Vol 1037 ◽  
pp. 449-456
Author(s):  
Andrey V. Brover ◽  
Galina I. Brover ◽  
Olga B. Moysova ◽  
Valeriya E. Yankovskaya
Keyword(s):  
Crystal Structure ◽  
Mass Transfer ◽  
Plastic Deformation ◽  
Laser Heating ◽  
Alloying Elements ◽  
Simultaneous Action ◽  
Surface Layers ◽  
Linear Defects ◽  
Transfer Parameters ◽  
Local Plastic Deformation

Possible causes of mass transfer acceleration of carbon atoms and alloying elements in the surface layers of steels and alloys under extreme heating, under pulsing laser irradiation in particular, are considered. The research shows that the anomaly accelerated mass transfer, including diffusion in particular, in steels and alloys under fast laser heating has a cooperative character and is a result of a simultaneous action of several processes of different physics. It is proved that the carbon atoms mass transfer parameters and alloying elements depend on the scale and the level of emerging tension, relaxation of which goes along with a local plastic deformation, and occurrence of increased number of linear defects in crystal structure.

Thermal Expansion of Composite System Epoxy Resin/Recycled Carbon Fibers

2020 ◽  
Vol 994 ◽  
pp. 162-169
Author(s):  
Štěpánka Dvořáčková ◽  
Dora Kroisová
Keyword(s):  
Experimental Study ◽  
Thermal Expansion ◽  
Epoxy Resin ◽  
Carbon Fibers ◽  
Composite System ◽  
Linear Thermal Expansion Coefficient ◽  
Linear Thermal Expansion ◽  
Carbon Fibres ◽  
Sample Matrix ◽  
Composite Systems

This experimental study deals with the problematics of thermal expansion α [10-6/K] of the composite systems based on recycled carbon fibres reinforced epoxy resin. The epoxy resin CHS – EPOXY 520 (EPOXY 15), cured with the hardener P11 (Districhem, s.r.o.), was chosen as a sample matrix. Recycled carbon fibres with a diameter of 7 μm and a length of 100 μm (Easy Composites Ltd.) were the filler. In the experiment, samples with the fulfilment of 10, 20, 40, 60, 80, 90 and 100 phr were prepared. The samples were being poured into silicone molds, cured at an overpressure of 0.7 MPa and a temperature of 23 ± 2 °C for 24 hours. A thermomechanical analyzer was used to determine the thermal expansion of composite systems. The addition of recycled carbon fibers to epoxy resin can reduce the coefficient of linear thermal expansion at 20°C in half, from the original α = 45 to 55 × 10-6/K for non-filled epoxy resin to α = 25 to 27 × 10-6/K for filled epoxy resin. Optimal filling is at the level of 40 phr, with higher filling there is no further reduction of the linear thermal expansion coefficient.

Characterization and Synthesis of Functional TiO2 Sol-Gel Coatings on the Glass

2006 ◽  
Vol 510-511 ◽  
pp. 94-97
Author(s):  
Dae Yong Shin ◽  
Myung Gi So ◽  
Sang Mok Han
Keyword(s):  
Thin Film ◽  
Crystal Structure ◽  
Spin Coating ◽  
Air Pollutants ◽  
Water Drop ◽  
Sol Gel ◽  
Molecular Size ◽  
Coating Process ◽  
Tio2 Films ◽  
Spin Coating Process

Thin film photocatalysts of TiO2 coated on the glass were prepared to self-clean and eliminate air pollutants by spin coating process with Ti(OC3H7 i)4, including PEG. The surface structure of TiO2 films changed according to the molecular size of PEG. It was found that NOx was efficiently eliminated by the TiO2 film photocatalyst. The contact angle of water drop on the TiO2 films decreased to less than 10°. It revealed the hydrophilic property of TiO2 films. The morphology and the crystal structure of TiO2 films were affected most.

Studies Regarding the Influence of Loading Force on the Wear Intensity in Case of Polymeric Composite Materials Reinforced with Short Carbon Fibers

2014 ◽  
Vol 1036 ◽  
pp. 36-39
Author(s):  
Radu Caliman
Keyword(s):  
Composite Materials ◽  
Carbon Fibers ◽  
Research Work ◽  
Polymeric Composite ◽  
Wear Intensity ◽  
Tantalum Carbide ◽  
Carbon Fibres ◽  
Polymeric Composite Materials ◽  
Pin On Disc ◽  
Short Carbon

This paper presents a study of the wearing behaviour of polymeric composite materials reinforced with short carbon fibres. Reinforces carbon fiber materials are more effective if refer to specific properties per unit volume compared to conventional isotropic materials. The composite materials used in this research work are obtained combining epoxy with short carbon fibres with titanium carbide and tantalum carbide in order to investigate the wearing intensity of the obtained composites. Varying the percent of epoxy from 29,35% to 43,92% and the percent of short carbon fibres from 35,43% to 53,70%, two different composite materials are obtained and tested. Wearing intensity tests are carried out, at room temperature, in dry conditions, on a pin-on-disc machine. The friction coefficient was measured maintaining constant the rotational speed (14 m/s) and time (120s) and varying the pin-on-disc pressing force: 4, 8 and 12 daN. The pressing load had different effects on the wearing behaviour of the composite coating in dry friction condition. With low percent of epoxy and high percent of carbon fibers the wearing intensity is touching the highest value and gradually decreases with the increasing load, while in low percent of carbon fibers the wearing intensity became larger gradually along with the load increasing.

scholarly journals Investigation on the flexural properties of nanofillers loading on the Jute/Carbon/PLA nanocomposites

2020 ◽  
Vol 14 (4) ◽  
pp. 7424-7433
Author(s):  
Nur Aqilah Sairy ◽  
Norkhairunnisa Mazlan ◽  
Mohamad Ridzwan Ishak ◽  
Nik Noriman Zulkepli
Keyword(s):  
Polymer Nanocomposites ◽  
Carbon Fibers ◽  
Flexural Modulus ◽  
Polymer Nanocomposite ◽  
Fiber Reinforced Polymer ◽  
Carbon Fibres ◽  
Nanocomposite Fiber ◽  
Reinforced Polymer ◽  
Flexural Analysis ◽  
Fractured Surface

Presence of fibers and fillers in a composite can be an efficient way to arrest crack either at macro or micro levels. In this work, woven jute and carbon fibers were arranged alternately in PLA (Polylactic Acid) nanocomposite. Graphene or nanoclay was embedded into PLA matrix to make polymer nanocomposite. Fiber reinforced polymer nanocomposites were prepared by varying the concentration of graphene or nanoclay in the PLA matrix and alternate woven jute/carbon fibers was then bind with the PLA nanocomposite. Influence of graphene or nanoclay concentration and presence of woven fibres in the composite was quantified by flexural analysis. Flexural strength and flexural modulus were found to increase at 3wt% of nanofiller concentration for both graphene/jute/PLA and nanoclay/jute/PLA nanocomposites with increment up to 37% and 31%, respectively. FTIR was used to determine the interaction between PLA and nanofillers. Morphology observation by Scanning Electron Microscopy (SEM) was done to investigate the fractured surface of the hybrid jute/carbon fibres reinforced PLA nanocomposite.

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