scholarly journals Properties of Pinus modified with silicon–titanium binary oxides

BioResources ◽  
2020 ◽  
Vol 16 (1) ◽  
pp. 747-763
Author(s):  
Xiaoling Liu ◽  
Songwu Chen ◽  
Yunlin Fu
Keyword(s):  
Wood Surface ◽  
Color Change ◽  
Sol Gel ◽  
Resistance Testing ◽  
Chemical Bonds ◽  
Noticeable Increase ◽  
Aging Resistance ◽  
Tio2 Gel ◽  
Unmodified Wood ◽  
Modified Wood

Modification of Pinus yunnanensis using SiO2–TiO2 was carried out via the sol–gel method. The aim was to improve the hydrophobicity, aging resistance, and photocatalysis of the wood surface via the formation of new chemical bonds with penetrated SiO2 and TiO2. The air-dried P. yunnanensis wood underwent penetration, gelation, aging, and drying. The wood was exposed to high temperatures for modification, and its microstructure, composition, photodegradability, resistance to aging, dimensional stability, and hydrophobicity were then determined. The results indicated that during modification, SiO2–TiO2 gel was generated in the wood, and the content of the gel increased as penetration time was extended. No structural change in the wood was observed. Meanwhile, chemical bonds were formed among SiO2, TiO2, and wood. The contact angle of the modified wood increased noticeably relative to that of unmodified wood. This increase indicated a noticeable increase in the hydrophobicity of the wood surface. The modified wood exhibited high photocatalytic degradation; however, its durability was not evident. The water absorption and thickness swelling of the modified wood markedly increased. After ultraviolet-aging resistance testing, the color change in the surface of the modified wood was noticeably less than that of the unmodified wood.

scholarly journals Highly Hydrophobic and Self-Cleaning Heat-Treated Larix spp. Prepared by TiO2 and ZnO Particles onto Wood Surface

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 986
Author(s):  
Dong Xing ◽  
Yan Zhang ◽  
Jianpeng Hu ◽  
Lihong Yao
Keyword(s):  
Wood Surface ◽  
Hydrothermal Reaction ◽  
Sol Gel ◽  
Treated Wood ◽  
Visual Observation ◽  
Hydrophobic Properties ◽  
Heat Treated ◽  
Zno Particles ◽  
Highly Hydrophobic ◽  
Modified Wood

The deposition of TiO2/ZnO on heat-treated wood was prepared by a hydrothermal reaction and sol-gel method. Highly hydrophobic wood was successfully prepared with low surface free energy. The surface-modified wood samples were characterized by 3D-laser shape measurement microscopy, scanning electron microscopy, energy-dispersive spectroscopy, and Fourier transform infrared spectroscopy for the microstructure and chemical composition investigation. The deposited TiO2 or ZnO markedly made the wood surface brighter, which was demonstrated by visual observation and spectrophotometer. The TiO2/ZnO particles were successfully loaded onto the surface of the wood, proven by SEM-EDS and FTIR analyses. The contact angle of TiO2 and ZnO-modified wood reached 123.9° and 134.1° respectively, which is obviously higher than that of the control at 88.9°. The hydrophobic properties of the TiO2/ZnO modified wood samples were directly related to the shapes of clusters and spheres of particles, which increased the roughness of the wood surface. This study shows the hydrophobic properties of the TiO2/ZnO-modified wood and provides the color and roughness changes for the painting process of heat-treated wood.

scholarly journals Wood protective coatings based on fluorocarbosilane

Cellulose ◽  
2019 ◽  
Vol 26 (18) ◽  
pp. 9853-9861 ◽  
Author(s):  
Karol Szubert ◽  
Agnieszka Dutkiewicz ◽  
Michał Dutkiewicz ◽  
Hieronim Maciejewski
Keyword(s):  
Wood Surface ◽  
Protective Coatings ◽  
Sol Gel ◽  
Chemical Bonds ◽  
Gel Method ◽  
Sol Gel Method ◽  
Effective Barrier

Abstract The effectiveness of protective coatings based on 3-(2,2,3,3,4,4,5,5-octafluoropentyloxy)propyltriethoxysilane in the protection of wood surface from the effects of water was tested. No earlier attempts at using the mentioned fluorocarbosilane for the protection of wood have been reported in the literature. The coatings were deposited by the sol–gel method. As a result of the generation of chemical bonds between the wood surface and silane, a coating was produced that permanently increased the wood hydrophobicity. Fluorinated chains attached to the silicon atoms make an effective barrier preventing the access of water and limiting the effects of water on the wood surface.

Aging resistance and photocatalytic activity of a wood surface coated with a Zr4+-doped SiO2/TiO2 film

BioResources ◽  
2020 ◽  
Vol 15 (3) ◽  
pp. 6404-6419
Author(s):  
Zhigao Liu ◽  
Luning Xuan ◽  
Yunlin Fu
Keyword(s):  
Photocatalytic Activity ◽  
Composite Film ◽  
Wood Surface ◽  
Photoelectron Spectroscopy ◽  
Sol Gel ◽  
Crystal Form ◽  
Physicochemical Characteristics ◽  
Doping Amount ◽  
X Ray ◽  
Aging Resistance

A Zr4+-doped SiO2/TiO2 composite film (Zr4+-doped STCF) was prepared on a wood surface via a sol-gel method to improve its photocatalytic activity and aging resistance. The physicochemical characteristics of the composite film were analyzed by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and low-temperature N2 sorption methods. The photocatalytic degradation of methyl orange and its aging resistance under ultraviolet light were tested. The results showed that the composite film had an anatase TiO2 crystal form, and the addition of Zr4+ to the composite film noticeably improved photocatalytic activity and aging resistance. The highest degradation percentage occurred at 0.5 wt% Zr4+ (59.2%) when the Zr4+ ion doping amount was 2.5 wt%, and the aging resistance of the composite film also peaked under these conditions. The wood surface coated with Zr4+-doped STCF exhibited strong aging resistance and photocatalytic activity, which protected the surface from discoloration and decomposition. As it degraded organic pollutants, the modified wood surface had a good self-cleaning function.

scholarly journals Wood Surface Changes of Heat-Treated Cunninghamia lanceolate Following Natural Weathering

Forests ◽  
2019 ◽  
Vol 10 (9) ◽  
pp. 791
Author(s):  
Xinjie Cui ◽  
Junji Matsumura
Keyword(s):  
Heat Treatment ◽  
Wood Surface ◽  
Color Change ◽  
Thermal Modification ◽  
Protective Measure ◽  
Surface Color ◽  
Natural Exposure ◽  
Heat Treated ◽  
The Impact ◽  
Cunninghamia Lanceolate

To quickly clarify the effect of heat treatment on weatherability of Cunninghamia lanceolate (Lamb.) Hook., we investigated the surface degradation under natural exposure. A comparison between heat-treated and untreated samples was taken based on surface color changes and structural decay at each interval. Over four weeks of natural exposure, multiple measurements were carried out. Results show that color change decreased in the order of 220 °C heat-treated > untreated > 190 °C heat-treated. The results also indicate that the wood surface color stability was improved via the proper temperature of thermal modification. Low vacuum scanning electron microscopy (LVSEM) results expressed that thermal modification itself had caused shrinking in the wood surface structure. From the beginning of the weathering process, the heat treatment affected the surface structural stability. After natural exposure, the degree of wood structure decay followed the pattern 220 °C heat-treated > 190 °C heat-treated > untreated. Therefore, when considering the impact on the structure, thermal modification treatment as a protective measure to prevent weathering was not an ideal approach and requires further improvement.

scholarly journals Hydrogenolysis of C−O Chemical Bonds of Broad Scope Mediated by a New Spherical Sol-Gel Catalyst

ChemistryOpen ◽  
2017 ◽  
Vol 7 (1) ◽  
pp. 80-91 ◽  
Author(s):  
Valerica Pandarus ◽  
Rosaria Ciriminna ◽  
Geneviève Gingras ◽  
François Béland ◽  
Mario Pagliaro ◽  
...  
Keyword(s):  
Sol Gel ◽  
Chemical Bonds ◽  
Broad Scope

FTIR and color change of the modified wood as a result of artificial light irradiation

2010 ◽  
Vol 99 (3) ◽  
pp. 144-149 ◽  
Author(s):  
Dan Rosu ◽  
Carmen-Alice Teaca ◽  
Ruxanda Bodirlau ◽  
Liliana Rosu
Keyword(s):  
Color Change ◽  
Light Irradiation ◽  
Artificial Light ◽  
Modified Wood

scholarly journals RESEARCH OF THE SWELLING KINETICS OF PINE WOOD, MODIFIED WITH AMINO-BORATES

2018 ◽  
Vol 3 (3) ◽  
pp. 81-88
Author(s):  
Ирина Котлярова ◽  
Irina Kotlyarova ◽  
Ирина Степина ◽  
Irina Stepina
Keyword(s):  
Control Sample ◽  
Swelling Kinetics ◽  
Wood Composite ◽  
Wood Material ◽  
Pine Wood ◽  
Weight Method ◽  
Kinetics Of ◽  
Water Sorption Capacity ◽  
Unmodified Wood ◽  
Modified Wood

Wood swells at the contact with capillary and liquid water. This process leads to premature destruction of wood material due to the decrease in its strength characteristics. It is possible to reduce wood swelling in various ways: deep impregnation by hydrophobic reagents, covering the surface with paints and varnishes etc. However, in this case the texture of wood is masked and its unique properties are lost. When modifying wood with amino-borates the supramolecular structure of cellulose is ordered, the specific surface of wood decreases, and its water sorption capacity is reduced. In this regard, we have researched the influence of boron-nitrogenous modifiers of various concentrations on pine wood swelling. The swelling ability of the modified wood was estimated by weight method. As a control sample the samples of unmodified wood were used. On the basis of the obtained experimental data the differential curves of swelling were built and the velocity constants of swelling were determined by a graphic method. As a result of the research it has been established that modifying wood with amino-borates leads to the decrease of equilibrium extent of swelling, and the velocity constant of swelling depends on the nature and concentration of the modifier and its influence on the microstructure of a wood composite.

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