scholarly journals Microstructure and Hydrophobic Properties of Nano-Cu-Coated Wood-Based Composites by Ultrasonic Pretreatment

2020 ◽  
Vol 10 (16) ◽  
pp. 5448
Author(s):  
Hongbo Mu ◽  
Yanan Wang ◽  
Yongqi Tian ◽  
Xiaoming Duan ◽  
Jingkui Li ◽  
...  
Keyword(s):  
Composite Materials ◽  
Magnetron Sputtering ◽  
Metallic Copper ◽  
Copper Film ◽  
Added Value ◽  
Practical Significance ◽  
Wood Veneer ◽  
Hydrophobic Properties ◽  
Water Contact ◽  
Wood Based Composite

The combination of nano-metal and wood to prepare copper-coated wood-based composite materials has important research value and practical significance for improving the function of wood, expanding the application field of wood, and adding added value. In this paper, 31-year-old wood (Pinus sylvestris L. var. mongholica Litv) veneer was taken as the research object. The wood veneer was pretreated by ultrasonic wave, and copper film was deposited on the surface of the wood veneer by magnetron sputtering to prepare “environmentally friendly” copper-plated wood-based composite materials. The microstructure and hydrophobic properties of Cu-coated wood-based composites were characterized and studied. With the increase in coating time, the diffraction peak intensity of wood cellulose gradually decreased, and the diffraction peaks of Cu (111), Cu (200), and Cu (220) of metallic copper appeared. Under the sputtering condition of a substrate temperature of 200 °C, the copper film deposit on the surface of the wood was uniform and densely arranged. The surface water contact angle reached 149.9°. Ultrasonic treatment increases the porous structure of wood, and the rough metal copper film interface was constructed on the surface of wood by magnetron sputtering to transform the surface wettability of the wood from hydrophilic to super-hydrophobic. The lotus leaf effect was realized on the wood surface.

scholarly journals Copper Rich Composite Materials Based on Carboxylic Cation Exchangers and Their Thermal Transformation

Polymers ◽  
2021 ◽  
Vol 13 (18) ◽  
pp. 3199
Author(s):  
Elżbieta Kociołek-Balawejder ◽  
Ewa Stanisławska ◽  
Irena Jacukowicz-Sobala ◽  
Igor Mucha
Keyword(s):  
Composite Materials ◽  
Thermal Transformation ◽  
Thermal Analyses ◽  
Metallic Copper ◽  
Matrix Decomposition ◽  
Exchange Capacity ◽  
Practical Significance ◽  
Ion Exchange Capacity ◽  
Cation Exchangers ◽  
Xrd Patterns

The effect of a cupric deposit (Cu2+, CuO) on the thermal decomposition of carboxylic cation exchangers (CCEs) is not known, and such studies may have practical significance. CCEs have a very high ion exchange capacity, so an exceptionally large amount of CuO (which is a catalyst) can be precipitated inside them. Two CCEs, macroreticular (Amberlite IRC50) and gel-like (Amberlite IRC86), served as a polymeric support to obtain copper-rich hybrid ion exchangers. Composites with CuO particles inside a polyacrylic matrix (up to 35.0 wt% Cu) were obtained. Thermal analyses under air and under N2 were performed for CCEs in the H+ and Cu2+ form with and without a CuO deposit. The results of sixteen experiments are discussed based on the TG/DTG curves and XRD patterns of the solid residues. Under air, the cupric deposit shifted the particular transformations and the ultimate polymeric matter decomposition (combustion) toward lower temperatures (even about 100–150 °C). Under N2, the reduction of the cupric deposit to metallic copper took place. Unique composite materials enriched in carbonaceous matter were obtained, as the products of polymeric matrix decomposition (free radicals and hydrogen) created an additional amount of carbon char due to the utilization of a certain amount of hydrogen to reduce Cu (II) to Cu0.

scholarly journals Research on the Gradual Process of the Metallization Structures and Mechanical Properties of Wood Veneer

Symmetry ◽  
2018 ◽  
Vol 10 (11) ◽  
pp. 550 ◽  
Author(s):  
Jingkui Li ◽  
Ruoying Wang ◽  
He Tian ◽  
Yanan Wang ◽  
Dawei Qi
Keyword(s):  
Mechanical Properties ◽  
Magnetron Sputtering ◽  
Wood Surface ◽  
Deposition Time ◽  
Copper Film ◽  
Wood Cellulose ◽  
Wood Veneer ◽  
Gradual Process ◽  
Veneer Surface ◽  
Moduli Of Elasticity

In order to improve the mechanical properties of the wood surface and explore the mechanical effect of wood veneer surface metallization, the 31-year-old Pinus sylvestris is taken as the research object and Cu is deposited on the wood surface by magnetron sputtering to achieve wood veneer metallization. Based on X-ray diffraction (XRD) and nanoindentation, a research on the gradual process of the structures and mechanical properties of wood veneer metallization was carried out. The results indicate that wood veneer metallization does not affect the crystallization zone of wood, there are still wood cellulose characteristic peaks and the crystalline structure of the wood cellulose is not damaged; the thickness of the copper thin film increases with the increase of the deposition time, the cellulose characteristic peak strength gradually decrease, and the relative crystallinity also decreases; the characteristic diffraction peaks of Cu (111), Cu (200), and Cu (220) appear near the diffraction angle 2θ which is equal to 43.3°, 50.4°, and 74.1°, and the diffraction peak intensity increases with increase of deposition time, the copper film of the metal wood veneer crystallizes well; the load–displacement of wood veneer decreases significantly with the increase of deposition time, while the moduli of elasticity and hardness increase rapidly. The load–displacement of the samples which were coated for 15 min decreased by 80%, while the moduli of elasticity and hardness of these samples increased by 24.1 times and 17.3 times, respectively. From the results of Scanning Electron Microscope (SEM) measurement of the metallization of wood veneer, it can be seen that the uniform and continuous copper film can be formed on the wood veneer surface by using the magnetron sputtering method. This paper provides a basis for wood veneer surface metallization, which is of great significance for the functional improvement of wood, the expansion of wood application fields, and the enhancement of added value.

Wood Functional Modification Based on Deposition of Nanometer Copper Film by Magnetron Sputtering

2020 ◽  
Vol 70 (3) ◽  
pp. 340-349
Author(s):  
Jingkui Li ◽  
Yanan Wang ◽  
He Tian ◽  
Dawei Qi ◽  
Ruoying Wang
Keyword(s):  
Electrical Conductivity ◽  
Magnetron Sputtering ◽  
Physical Properties ◽  
Sheet Resistance ◽  
Wood Surface ◽  
Room Temperature ◽  
Copper Film ◽  
Base Temperature ◽  
Wood Veneer ◽  
Thin Copper Film

Abstract It can be helpful for selected applications to improve the functionality of wood by compounding nano-metal materials with wood, endowing the wood surface with certain physical properties, for example, metallicity, electrical conductivity, and hydrophobicity. Therefore, in this study, a thin copper film was deposited on the surface of Pinus sylvestris L. var. mongholica Litv. veneer by magnetron sputtering. The film was applied at both room temperature and 200°C to obtain nano-copper–wood composites. The physical properties of wood-based nano-metal composites were characterized. The results indicated that the wood veneer metallization had no effect on the crystallization zone of wood; there were still wood cellulose characteristic peaks, but the intensity of the diffraction peak decreased. At the same time, there were characteristic diffraction peaks of copper. The mechanical properties of the wood veneer surface changed greatly; the surface of copper-plated wood veneer had good electrical conductivity and the wettability of the wood surface transformed from hydrophilic to hydrophobic. When the base temperature was 200°C, not only was the sheet resistance of the sample with coating time of 15 minutes about 4.6 times that of the sheet resistance of the sample at room temperature, but also the quality of the copper film on the wood surface was better than that at room temperature. The copper film was mainly composed of small particles with a compact arrangement.

scholarly journals Preparation of Assembled Carbon Soot Films and Hydrophobic Properties

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2318 ◽  
Author(s):  
Lei Zhao ◽  
Kang Zhao ◽  
Wei-Guo Yan ◽  
Zhifeng Liu
Keyword(s):  
Self Assembly ◽  
Lithium Ion ◽  
Deionized Water ◽  
Mixed Solution ◽  
Hydrophobic Properties ◽  
Water Contact ◽  
Wetting Properties ◽  
Candle Soot ◽  
Number Of Layers ◽  
Carbon Soot

In this paper, a simple, inexpensive, and rapid method for the fabrication of controlled layer candle soot film has been reported by interface self-assembly and transferred method. The mechanism of candle soot self-assembly is explained and their morphology, elemental composition, optical, and wetting properties are characterized. The uniformity and thickness of prepared films especially depend on the concentration of candle soot mixed solution (alcohol and deionized water). The results show that the optimal concentration of candle soot solution is approximately ~0.2% wt/mL. In addition, the absorption spectra of the controlled-layer candle soot films are determined by the number of layers and the surface morphology. The hydrophobic properties of candle soot films are closely related to their layer number. When these films reach to the fourth layer, the water contact angle and roll-off angle are measured as 142° ± 2° and 6°, respectively. The controlled assembly CS films have the potential application in photo/electrocatalysis, solar cells, lithium-ion batteries, and water splitting.

scholarly journals Preserving the Cellular Tissue Structure of Maize Pith Though Dry Fractionation Processes: A Key Point to Use as Insulating Agro-Materials

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5350
Author(s):  
Claire Mayer-Laigle ◽  
Laia Haurie Ibarra ◽  
Amélie Breysse ◽  
Marina Palumbo ◽  
Frédéric Mabille ◽  
...  
Keyword(s):  
Particle Size ◽  
Composite Materials ◽  
Plant Biomass ◽  
Cellular Tissue ◽  
Added Value ◽  
Vascular Bundles ◽  
Dry Fractionation ◽  
Promising Alternative ◽  
Structural Support ◽  
Electrostatic Separator

Plant biomass has various compositions and structures at different scales (from the component organs to their constitutive tissues) to support its functional properties. Recovering each part of the plant without damaging its structure poses a challenge to preserving its original properties for differential dedicated end uses, and considerably increases its added value. In this work, an original combination of grinding based on shearing stress and separation based on particle size and density was successfully used to sort rind (65% w/w) and pith (35% w/w) from maize stem internodes. More than 97% of the rind was isolated. The pith alveolar structure was well preserved in coarse particles, making them suitable for insulation bio-based composite materials, a promising alternative to conventional nonbiodegradable insulation panels. Boards produced from the dry fractionated pith exhibited thermal conductivities like those produced from hand dissected pith, with values equal to 0.037 W·mK−1 and 0.039 W·mK−1, respectively. In the finest fraction (particle size <1 mm), the pith vascular bundles (around 300–400 µm in diameter) were dissociated from parenchyma cells and successfully isolated using a cutting-edge electrostatic separator. Their structures, which provide the plant structural support, make them potentially valuable for reinforcement in composite materials.

scholarly journals IMPACT OF CREATIVE INDUSTRIES ON THE VISUAL IMAGE OF A CITY

2019 ◽  
pp. 70-72
Author(s):  
A. M. Tormakhova
Keyword(s):  
Urban Space ◽  
Visual Image ◽  
Creative Industries ◽  
Economic Feasibility ◽  
Individual Development ◽  
Added Value ◽  
Practical Significance ◽  
City Development ◽  
Modern City ◽  
The City

The aim of the article is to highlight the specificity of visual transformations that occur in the modern urban space under the influence of the development of creative industries. The research methodology involves an interdisciplinary approach and engaging a range of cultural, sociological, and philosophical works. The works of modern foreign researchers Z.Bauman, Ch. Landry, D.Hezmondhalsh are attracted.The sphere of urban planning and the problem of creative industries are being studied. Thanks to creative industries is appears new jobs, the solution of social problems (especially in poor areas), as well as the transformation of urban space. The modern city is a reflection of the transformational processes taking place in the world. There is a change in the form of regulation of the city development policy, from the state to the municipal. There are conditions for activating creative industries that can be defined as an individual creative background, skill or talent that can create added value and jobs through the production and exploitation of intellectual property. The development of creative industries has economic feasibility, but this process is accompanied by a change in the image of the city. Urban space is the text of culture, which often combines non-interconnected components. The visual image of the modern city is repulsive and attractive, it is difficult to bring it to a single concept, but it continues to be the center of human life. Scientific novelty lies in the study of the relationship of the development of creative industries in the urban space and their impact on the visual image of the city. Practical significance is connected with the emphasis on the need to invent an individual development strategy for each city as a “creative city”, where the sphere of cultural production is leading. Promising is the direction of creative industries in a single direction and minimizing the factors influencing the negative perception of the vision of the city.

scholarly journals Aqueous poly(N-Vinylformamide-co-Vinylamine) as a suitable adhesion promoter for wood veneer/biopolyethylene composite materials

BioResources ◽  
2017 ◽  
Vol 12 (4) ◽  
pp. 8134-8159
Author(s):  
Rico John ◽  
Katja Trommler ◽  
Katja Schreiter ◽  
Carolin Siegel ◽  
Frank Simon ◽  
...  
Keyword(s):  
Composite Materials ◽  
Photoelectron Spectroscopy ◽  
Ph Value ◽  
Structural Parameters ◽  
Degree Of Hydrolysis ◽  
Adhesion Promoter ◽  
Wood Veneer ◽  
X Ray ◽  
Young’S Moduli ◽  
Veneer Surface

Wood veneer/biopolyethylene (bio-PE) biocomposite materials were produced by using poly(N-vinylformamide-co-vinylamine) (PVFA-co-PVAm) copolymers as a phase-mediating reagent. In a preliminary step, PVFA-co-PVAm was adsorbed onto the wood veneer component from aqueous solution. In its adsorbed form, it served as an adhesion promoter and improved the compatibility between both the highly polar wood veneer and weakly polar bio-PE surface. Structural parameters and their effect on the adsorption process, such as the degree of hydrolysis (DH) of poly(N-vinylformamide) (PVFA) (30, 50, and > 90%), the molecular weight of PVFA-co-PVAm (Mw 10,000, 45,000, or 340,000 g/mol), and the pH value (4, 7, and 11) influenced the resulting wetting behavior of the PVFA-co-PVAm-modified wood veneer surface. Thus, the hydrophobizing effect of the PVFA-co-PVAm was clearly detectable because the contact angle with water was considerably increased up to 116° by adsorption of PVFA-co-PVAm 9095 at pH 11. The adsorbed amount of PVFA-co-PVAm was determined by energy-dispersive X-ray (EDX) spectroscopy and X-ray photoelectron spectroscopy (XPS). The PVFA-co-PVAm-coated wood veneers were consolidated with bio-PE in a hot press process. The modified composite materials showed remarkably improved Young’s moduli (552 MPa) and tensile strengths (4.5 MPa) compared to former composite materials produced without PVFA-co-PVAm modification.

Effects of Continuous and Discontinuous Deposition Time in Reactive Direct Current Magnetron Sputtering of Titanium Dioxide Thin Films

2015 ◽  
Vol 1131 ◽  
pp. 251-254
Author(s):  
Montri Aiempanakit ◽  
Chantana Salawan ◽  
Kamon Aiempanakit
Keyword(s):  
Thin Films ◽  
Grain Size ◽  
Surface Morphology ◽  
Magnetron Sputtering ◽  
Direct Current ◽  
Deposition Time ◽  
Spherical Shape ◽  
Contact Angles ◽  
Water Contact ◽  
Direct Current Magnetron Sputtering

The effect of continuous and discontinuous deposition time on the properties of TiO2 thin films deposited by reactive direct current magnetron sputtering (DCMS) on glass substrates was investigated. The deposition processes were designed for a condition of continuous deposition time D1 (60 min) and three conditions of discontinuous deposition time D2 (30 min × 2 times), D3 (15 min × 4 times), and D4 (1 min × 60 times). The crystal structure, surface morphology, and hydrophilicity of TiO2 thin films were characterized by X-ray diffraction, atomic force microscope, and water contact angle method, respectively. It was found that the increasing of discontinuous deposition time (conditions from D1 to D4) shows the changing of grain size from big grain size with spherical shape to small grain size with oval shape. The crystallinity of TiO2 films decrease with increasing the discontinuous deposition time. The water contact angles also decrease as a function of increasing discontinuous deposition time. These results may be explained from the accumulation of heat on the substrate which affected the phase composition and surface morphology of TiO2 thin films.

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