COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2019
·
IF 6.282
Le Cheng,Jiachun Feng
In this work, form-stable phase change composites (PCCs) was prepared based on wood flour (WF), the by-product of timber industry, via delignification and impregnation with myristyl alcohol (MA). After delignification, the micro-channel structure inherited from wood was still maintained and unblocked in delignified wood flour (dWF), which are beneficial to accommodate and restrict solid-liquid phase change materials (PCMs). The dWF/MA PCCs exhibit excellent leakage-proof properties even at temperature much higher than the melting point of MA and high phase change enthalpy. The dWF/MA PCCs were further used to fabricate composite boards by bonding with urea–formaldehyde (UF) resin. The temperature management effect of dWF/MA/UF boards was tentatively demonstrated through constructing building models and measuring the inner temperature-time curves. This work provides a promising way to fully utilize and functionalize WF and broad its application in energy-related areas.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Biobased Materials and Bioenergy
·
2023
·Vol. 17
·期 2
·225-231
·
IF 0.5
Wang Lei,Miao Lei,Chen Dong-Chu,Zhang Min
The recycling use of wood sawdust to process composite boards has received much attention in recent years. To avoid the use of chemical adhesives, natural cellulose-based materials were often used as adhesives to combine wood sawdust. Rather than utilizing nanocellulose, the report
herein describes a method to prepare a robust composite board that is based on microfibrous cellulose, which is a low-cost commercial product. To effectively cross-link wood sawdust and microfibrous cellulose, phosphoric acid-activated glutaraldehyde was used as catalyst. Compared to its uncross-linked
counterpart, the modulus of elasticity and modulus of rupture of the composite board that had been cross-linked by glutaraldehyde and phosphoric acid were significantly strengthened to 3.45±0.06 GPa and 36.5±3.5 MPa, respectively. Moreover, the moisture resistance of the cross-linked
composite board was also enhanced. After soaking in water for 24 h, the mass swelling ratio and thickness swelling ratio of cross-linked composite board had only changed 49% and 21%, respectively. These performances even exceeded that of composite board prepared from nanocellulose. The method
described in this work may have applications in commercial processing and the recycling of wood sawdust.
研究领域:
材料科学
·
林业工程
✓ 已验证
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2024
·Vol. 39
·期 5
·1223-1228
·
IF 1.3
Cao Lijiu,Zhang Jiyao,Wang Xinqi,Zhang Xinhe,Huang Jian,Chen Yufang,Jin Tao
Through exploring the effects of low pH on the composite system of desulfurization gypsum (DG) enhanced by melamine-formaldehyde resin (MF), it is found that the inducing of sulfate-ion, in contrast to chloride and oxalate ions, favors the longitudinal growth of the crystalline form of the hydration product, which was relatively simple and had the highest length to width ( L / D ) ratio. At the same time, MF can also improve L / D ratio of gypsum hydration products, which favors the formation of hydrated whiskers. Finally, in a composite system composed of hemihydrate gypsum, MF, and glass fibers, when dilute sulfuric acid was used to regulate pH=3–4, the tight binding formed among the components of the composite system compared to pH=5–6. The hydration product of gypsum adheres tightly to glass fiber surface and produces a good cross-linking and binding effect with MF. The flexural strength, compressive strength, elastic modulus, and water absorption of the desulphurized gypsum composite board is 22.7 MPa, 39.8 MPa, 5 608 MPa, and 1.8%, respectively.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Electronic Materials
·
2021
·
IF 3.314
Jindou Shi,Ye Tian,Wenxing Gao,Meimei Xu,Yuanting Wu,Wanyin Ge
Exploring a convenient method to solve the stability problem of all-inorganic halide perovskite nanocrystals (NCs) has become an urgent task in their practical application. In recent years, cesium lead halide perovskite CsPbX3 (X = Cl, Br, and I) NCs, as the star material for the development of next-generation optoelectronic devices, have stimulated tremendous interest due to their excellent optical and electronic properties. Unfortunately, the performance of CsPbX3 NCs will become impaired due to interference from the external environment. Here, a convenient one-pot method was proposed, and the transition of CsPbBr3 quantum dots to two-dimensional CsPbBr3/CsPb2Br5 composite plates (CPs) was achieved by adjusting the reaction time. Large-scale octagonal CsPbBr3/CsPb2Br5 CPs were quickly obtained, and the morphology and phase transition in the entire reaction time period were explored. Subsequently, the products obtained at different reaction times were evaluated for long-term storage stability under air conditions, and the results showed that the CsPbBr3/CsPb2Br5 CPs exhibited excellent photoluminescence stability. The proposed preparation method presents a convenient way to improve the stability of CsPbX3 with low cost. On the other hand, by incorporating these products into thermoplastic polyurethane (TPU), a waterproof ink material that can be written directly was realized, where CsPbBr3/CsPb2Br5/TPU waterproof composite ink exhibits excellent stability and recyclability under aqueous solutions at different temperatures, which will provide a new choice for the commercial development of perovskite.
研究领域:
材料科学
·
化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Guanyu Han,Yaqing Liu,Guizhe Zhao
As the frequency range and application scenarios of electromagnetic devices continue to expand and diversify, developing materials with both broad frequency response and excellent wide-angle absorbing performance has become increasingly important. However, research on the mechanisms and strategies for enhancing the wide-angle absorption performance of all-dielectric metamaterials is still limited. Furthermore, stable absorbing plate materials with consistent structural and electromagnetic properties are essential for metamaterial design. The commonly used functional particles often experience uncontrollable sedimentation, leading to significant and irregular changes in the structure and electromagnetic characteristics of composite materials. In this work, a layer-by-layer gel/integrated solidification (LG/IS) process is proposed, enabling the fabrication of a uniform composite plate. Based on this plate, a double-layer stepped metamaterial (DSMM) with cubic copper cores (CCC) embedded in each unit cell is designed and manufactured. The introduction of CCCs strengthens the internal electromagnetic field through mechanisms such as electromagnetic resonance and unit coupling, improving impedance matching and extending the absorption bandwidth to 11.20 GHz, a 10.89 % increase compared to ordinary DSMM. Additionally, embedding CCCs stabilizes the electromagnetic field at large incident angles, significantly enhancing wide-angle absorption performance. This work provides valuable theoretical guidance and technical support for the bandwidth expansion and optimization of wide-angle absorption in all-dielectric metamaterials.
研究领域:
电磁学
·
材料科学
·
微波技术
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2025
·
IF 6.2
Gang Tang,Cunlong Fu,Xuhao Zhen,Mengfan Guan,Xin Wang,Dan Deng,Xiuyu Liu
Wood materials have been basic building and structural materials for thousands of years, but because of their particular composition, the flammability and flame retardant modification of wood composites have attracted widespread attention. In this study, a new strategy was designed for flame retardant modification of commercial wood boards, and a series of wood samples were prepared with improved hydrophobic and flame retardant properties via delignification, impregnation of phytic acid (PA) and 3, 5-diamino-1,2,4-triazole (ATA-N), and surface hydrophobic modification of trimethoxymethylsilane. After impregnation with PA and ATA-N, the wood samples exhibited outstanding flame retardant properties, and the Wood@PA/ATA-N sample presented a limit oxygen index (LOI) of more than 80 % and a UL-94 V-0 rating. In addition, the peak heat release rate (PHRR), total heat release (THR) and total smoke production (TSP) of Wood@PA were 92.0 %, 68.0 % and 63.0 % lower than those of the untreated wood. Moreover, surface treatment with organosilane significantly improved the hydrophobicity of the wood surface, and the water contact angle of the surface for Wood@PA/ATA-N/MTMS reached 93.4°, indicating a highly hydrophobicity. In conclusion, the strategies of delignification, flame retardant impregnation and surface modification could significantly improve the flame retardancy and hydrophobic properties of wood samples, thereby increasing their useful life and application value in construction and structural materials.
研究领域:
材料科学
·
高分子科学
·
消防安全工程
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）