Modification and Characterization of Nano-Ag/TiO2 Antimold Agent for Wood Materials

Lin, Lin; Yang, Yingni; Via, Brian K.; Liu, Yi; Guo, Huajun; Zhang, Fan

doi:10.13073/fpj-d-17-00016

Cited by 7 publications

(5 citation statements)

References 15 publications

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“…It was noteworthy that the treated Sm 2 O 3 with 20 pph KBE903 exhibited a higher footprint of KBE903 than those with 5 pph and 10 pph, probably due to the excessive use of KBE903 during the surface treatment that led to higher amounts of KBE903 remaining in the filler. The schemes showing the mechanism of grafting KBE903 on the surface of Sm 2 O 3 are shown in Figure 3 , which includes three main steps, namely hydrolysis, condensation, and the formation of hydrogen and covalent bonds [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

Simulation of Neutron/Self-Emitted Gamma Attenuation and Effects of Silane Surface Treatment on Mechanical and Wear Resistance Properties of Sm2O3/UHMWPE Composites

et al. 2021

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This work reports on the simulated neutron and self-emitted gamma attenuation of ultra-high-molecular-weight polyethylene (UHMWPE) composites containing varying Sm2O3 contents in the range 0–50 wt.%, using a simulation code, namely MCNP-PHITS. The neutron energy investigated was 0.025 eV (thermal neutrons), and the gamma energies were 0.334, 0.712, and 0.737 MeV. The results indicated that the abilities to attenuate thermal neutrons and gamma rays were noticeably enhanced with the addition of Sm2O3, as seen by the increases in µm and µ, and the decrease in HVL. By comparing the simulated neutron-shielding results from this work with those from a commercial 5%-borated PE, the recommended Sm2O3 content that attenuated thermal neutrons with equal efficiency to the commercial product was 11–13 wt.%. Furthermore, to practically improve surface compatibility between Sm2O3 and the UHMWPE matrix and, subsequently, the overall wear/mechanical properties of the composites, a silane coupling agent (KBE903) was used to treat the surfaces of Sm2O3 particles prior to the preparation of the Sm2O3/UHMWPE composites. The experimental results showed that the treatment of Sm2O3 particles with 5–10 pph KBE903 led to greater enhancements in the wear resistance and mechanical properties of the 25 wt.% Sm2O3/UHMWPE composites, evidenced by lower specific wear rates and lower coefficients of friction, as well as higher tensile strength, elongation at break, and surface hardness, compared to those without surface treatment and those treated with 20 pph KBE903. In conclusion, the overall results suggested that the addition of Sm2O3 in the UHMWPE composites enhanced abilities to attenuate not only thermal neutrons but also gamma rays emitted after the neutron absorption by Sm, while the silane surface treatment of Sm2O3, using KBE903, considerably improved the processability, wear resistance, and strength of the composites.

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Section: Resultsmentioning

confidence: 99%

Simulation of Neutron/Self-Emitted Gamma Attenuation and Effects of Silane Surface Treatment on Mechanical and Wear Resistance Properties of Sm2O3/UHMWPE Composites

et al. 2021

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“…Ag nanoparticles can significantly enhance the photocatalytic activity of TiO 2 by restraining the recombination of electron-hole pairs, which can lead to the improvement of the anti-mold effect of TiO 2 under natural light, weak light, and dark conditions [15,16]. Furthermore, nano-Ag has synergistic anti-mold effects with TiO 2 due to its own anti-mold abilities [17]. However, after doping with Ag, the enhanced polarity of TiO 2 makes it easier to agglomerate [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Enhanced Anti-Mold Property and Mechanism Description of Ag/TiO2 Wood-Based Nanocomposites Formation by Ultrasound- and Vacuum-Impregnation

et al. 2020

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Ag/TiO2 wood-based nanocomposites were prepared by the methods of ultrasound impregnation and vacuum impregnation. The as-prepared samples were characterized by field emission scanning electron microscopy (FESEM), energy-dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), mercury intrusion porosimetry (MIP), and water contact angles (WCAs). The anti-mold properties of the Ag/TiO2 wood-based nanocomposites were improved by 14 times compared to those of the original wood. The nano-Ag/TiO2, which was impregnated in the tracheid and attached to the cell walls, was able to form a two-stage rough structure and reduce the number of hydroxyl functional groups on the wood surfaces. The resulting decline of wood hydrophobic and equilibrium moisture content (EMC) destroyed the moisture environment necessary for mold survival. Ag/TiO2 was deposited in the wood pores, which reduced the number and volume of pores and blocked the path of mold infection. Thus, the anti-mold properties of the Ag/TiO2 wood-based nanocomposite were improved by cutting off the water source and blocking the mold infection path. This study reveals the anti-mold mechanism of Ag/TiO2 wood-based nanocomposites and provides a feasible pathway for wood-based nanocomposites with anti-mold functions.

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“…The TG curves show that the thermal degradation process of the poplar and modified poplar can be roughly divided into the following three stages: The first stage is the drying stage, where the temperature between 25 and 120 • C is mainly the result of mass loss caused by the evaporation of water. The second stage is the charring stage, where the temperature between 120 and 380 • C mainly corresponds to the pyrolysis of cellulose and hemicellulose in the wood and the gradual formation of char in the C-C bond in the lignin unit benzene-propane graphite structure [28][29][30]. However, during this stage, a new pyrolysis phase occurs in the modified poplar at 140-220 • C, which may be generated with glyoxal hydrate or oligomer degradation in the composite modifier.…”

Section: Effect Of Silica Sol/mg Resin Modification On the Thermal St...mentioning

confidence: 99%

Study on Modification of Poplar Wood via Composite Impregnation with Silica Sol/Melamine–Glyoxal Resin

Liu,

Li,

Qin

et al. 2023

Polymers

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In order to overcome the defects of fast-growing poplar wood, such as low strength and poor toughness, this paper introduces a method of modifying poplar wood via impregnation with silica sol/melamine–glyoxal (silica sol/MG) resin and explores its effects on the physical, mechanical, and thermal properties of poplar wood. It was found via scanning electron microscopy that the composite modifier covered and filled the cell lumen, cell interstitial space, and cell wall pores of poplar wood. Further, infrared spectroscopy and X-ray photoelectron spectroscopy analyses confirmed that chemical cross-linking occurred between the silica sol/MG resin composite modifier and the internal groups of poplar wood and that the Si-O-Si flexible long chains introduced in the composite modifier formed a cross-linking network with poplar wood such as Si-O-Si and Si-O-C, which led to the improvement of the physical and mechanical properties and the enhancement of the thermal stability of poplar wood. The method provides a theoretical basis for the high-value utilization of fast-growing poplar wood.

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Modification and Characterization of Nano-Ag/TiO2 Antimold Agent for Wood Materials

Cited by 7 publications

References 15 publications

Simulation of Neutron/Self-Emitted Gamma Attenuation and Effects of Silane Surface Treatment on Mechanical and Wear Resistance Properties of Sm2O3/UHMWPE Composites

Simulation of Neutron/Self-Emitted Gamma Attenuation and Effects of Silane Surface Treatment on Mechanical and Wear Resistance Properties of Sm2O3/UHMWPE Composites

Enhanced Anti-Mold Property and Mechanism Description of Ag/TiO2 Wood-Based Nanocomposites Formation by Ultrasound- and Vacuum-Impregnation

Study on Modification of Poplar Wood via Composite Impregnation with Silica Sol/Melamine–Glyoxal Resin

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