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Start Over Author "Shumin Yang" Journal journal of wood science
4 results on '"Shumin Yang"'

1. Self-healing coatings for inhibiting corrosion of ferrous metals exposed to preservative-treated bamboo

Author

Qingping Wang, Jinzhen Cao, Xing’e Liu, Shumin Yang, and Mingliang Jiang

Subjects
Self-healing coating, Ferrous metal corrosion, Preservative-treated bamboo, Microcapsule, Organic preservative, Forestry, SD1-669.5, Building construction, TH1-9745
Abstract

Abstract This study aims to provide an effective method of inhibiting the corrosion of ferrous metals exposed to preservative-treated bamboo, thereby prolonging material service life and reducing maintenance costs. The synthesis and characterization of microcapsules were first described. The characterization included the particle size, surface morphology, thermal stability, and core content of microcapsules. The results showed that microcapsules had good thermal stability and high core loading. Then, the self-healing performance and corrosion resistance of self-healing coatings were evaluated. The results indicated that self-healing coatings can identify and heal the damage automatically and had a more positive effect on inhibiting metal corrosion. Also, the mechanical properties of self-healing coatings were analyzed. The results demonstrated that microcapsule embedment did not almost affect the mechanical properties of self-healing coatings.

Published
2020
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2. Comparison of physical and mechanical properties of four rattan species grown in China

Author

Shumin Yang, E’lin Xiang, Lili Shang, Xing’e Liu, Genlin Tian, and Jianfeng Ma

Subjects
Rattan, Physical–mechanical properties, Calamus, Species, Forestry, SD1-669.5, Building construction, TH1-9745
Abstract

Abstract Rattan cane is an important forest product only second to timber and bamboo, with higher economic value and ecological benefits. Physical and mechanical properties are more important quality performance indexes, which are highly correlated with the processing and utilization of rattan cane. The present paper describes a study of main physical and mechanical properties in different heights of rattan cane for four rattan species, and also makes a comparison of property for Calamus simplicifolius grown in different sites. The relationship between species, cane position, density and mechanical properties of the rattan in China is also discussed. The results show that the physical and mechanical properties differ among four rattan species, and they follow irregular variation pattern with height. The physical–mechanical properties have no significant difference among species except modulus of elasticity, and the same as the different geographical areas. The basic density and mechanical properties gave a more moderate correlation with quadric equation. This result will provide basic data support for property modification and commercial utilization of rattan resources.

Published
2020
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3. Effect of different silicon sources on rattan-based silicon carbide ceramic prepared by one-step pyrolysis

Author

Shumin Yang, Lili Shang, Jianfeng Ma, Heshuai Cui, Genlin Tian, Yu Zheng, and Xing’e Liu

Subjects
Materials science, Silicon, Scanning electron microscope, Whiskers, chemistry.chemical_element, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, 0104 chemical sciences, Biomaterials, chemistry.chemical_compound, chemistry, Chemical engineering, visual_art, Specific surface area, Silicon carbide, visual_art.visual_art_medium, Ceramic, Composite material, Fourier transform infrared spectroscopy, 0210 nano-technology, Pyrolysis
Abstract

Rattan-based silicon carbide (R-SiC) ceramics, R-SiCSiO2 and R-SiCSi, were successfully prepared from silica (SiO2) sol and silicon (Si) powder, respectively. The rattan powder was impregnated, respectively, with SiO2 sol at ambient temperature and liquid melt-Si at high temperature. This was followed by one-step direct pyrolysis at 1500 °C under an argon (Ar) atmosphere. The final SiC samples were analyzed using mass analysis, X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier transform infrared spectroscopy (FT-IR), scanning electron microscope (SEM), energy dispersive X-ray analysis (EDAX), and nitrogen (N2) physisorption techniques. Experimental results showed that the mass residual of R-SiCSi (42.56 wt%) was almost equal to R-SiCSiO2 (42.45 wt%). However, R-SiCSiO2 had a higher yield of SiC, a higher specific surface area and a more intact porous morphology preserved from the rattan biomass. In addition, some rod-like SiC whiskers and tablet-like SiC particles were found in R-SiCSiO2. By comparison, R-SiCSi had a large amount of unreacted Si, as well as certain amount of SiC and unreacted C. Thus, it can be concluded that SiO2 sols are more appropriate for use in preparation of SiC from rattan, whatever the porous microstructure, yield, and purity of SiC.

Published
2016

4. Changes in bamboo fiber subjected to different chemical treatments and freeze-drying as measured by nanoindentation

Author

Lili Shang, Xing’e Liu, Xi Yang, Genlin Tian, and Shumin Yang

Subjects
040101 forestry, Bamboo, Materials science, 04 agricultural and veterinary sciences, 02 engineering and technology, Nanoindentation, 021001 nanoscience & nanotechnology, Biomaterials, chemistry.chemical_compound, chemistry, 0401 agriculture, forestry, and fisheries, Lignin, Hemicellulose, Fiber, Composite material, Fourier transform infrared spectroscopy, 0210 nano-technology, Environmental scanning electron microscope, Secondary cell wall
Abstract

The effects of chemical treatments (H2O2 + CH3COOH, acidified NaClO2, and NaOH) and freeze-drying on bamboo fibers were studied at a submicron level, to characterize chemical and mechanical changes to the secondary cell wall. Specifically, a field emission environmental scanning electron microscope (FE-ESEM) and imaging fourier transform infrared spectroscopy (FTIR) were used to demonstrate degradation in morphology and molecular structure, and nanoindentation was used to track changes in micromechanical properties. The results showed that cellular structures after chemical treatments clearly displayed wrinkles, pores, and microfibrils. The decreased bands at 1508 cm-1 and 1426 cm−1 showed that lignin was degraded on treatment of H2O2 + CH3COOH and acidified NaClO2, which directly resulted in a decrease in hardness (H) in the secondary cell wall for treated fibers. In addition, a diminishing peak at 1733 cm−1 caused by NaOH solution indicated that hemicellulose was seriously degraded. It resulted in a decreased modulus (E r) by 13.71 % in bamboo fibers, while no obvious reduction was observed in the first two steps.

Published
2016

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