CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Hongyang Lian,Peisheng Li,Yantao Xu,Xiaochun Zhang
Bamboo is a sustainable, functional and rapidly growing natural material with excellent potential in sustainable building and industrial applications. However, as a structural material, bamboo is hindered by its low mechanical strength and poor mildew resistance. In this study, a simple and sustainable process was developed to partially remove lignin and hemicellulose from bamboo through alkaline pretreatment , combined with thermal mechanical compaction, to convert natural bamboo into a lightweight, high-strength, mildew resistant, and durable multifunctional structural material. The results showed that the comprehensive control effectiveness of the alkaline dense bamboo against Aspergillus niger , Penicillium citricola and Trichoderma viridis was 96.2%, the anti-mildew performance was significantly improved. Compared with natural bamboo, the flexural, tensile, and compressive strength of alkaline dense bamboo increased by 6.9 times, 2.5 times, and 4.6 times, respectively, reaching 578 MPa, 410 MPa, and 145 MPa. Compared with some synthetic structural materials with excellent mechanical properties, the alkaline dense bamboo also exhibited superior specific tensile strength and Shore hardness . The multifunctional alkaline dense bamboo prepared in this study provides the possibility for bamboo resources to be widely used in the field of structural engineering.
研究领域:
材料科学
·
林业工程
·
可持续发展
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Lu Han,Yi-fan Wang,Lin Zhu,Xi-ya Shan,Wen-qi Cui,Xing-hai Zhou,Yuan Gao,Li-hua Lyu
Lightweight and robust aerogels with multifunctionality are highly desirable to meet the technological demands of current society. Herein, we designed lightweight, elastic, and superhydrophobic multifunctional organic–inorganic fibrous hybrid aerogels which were assembled with organic aramid nanofibers and inorganic hierarchical porous carbon fibers. Thanks to the organic–inorganic fiber hybridization strategy, the optimal aerogels possessed remarkable compressibility and elasticity. Benefiting from the microscopic hierarchical porous structure of carbon fibers and the macroscopic macroporous lamellar structure of aerogels, the optimal aerogels exhibited superb lightweight property, conspicuous electromagnetic microwave absorption ability, and outstanding oily wastewater purification capacity. As for electromagnetic microwave absorption, it achieved a strong reflection loss of −41.8 dB, and the effective absorption bandwidth reached 6.86 GHz. Besides, the oil adsorption capacity for trichloromethane reached as high as 93.167 g g–1 with a capacity retention of 95.6% after 5 cycles. Meanwhile, it could act as a gravity-driven separation membrane to continuously separate trichloromethane from a trichloromethane–water mixture with a high flux of 7867.37 L·m–2·h–1, even for surfactant-stabilized water-in-n-heptane emulsions of 3794.94 L·m–2·h–1. Such a strategy might shed some light on the construction of multifunctional aerogels toward broader applications.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES COMMUNICATIONS
·
2021
·
IF 6.617
Lei Zhao,Hongyan Wu,Wenling Jiao,Xia Yin,Yang Si,Jianyong Yu,Bin Ding
Health risks are more likely to occur in cold environments, making warm equipment highly in demand. Fluffy fibrous sponge obtained from direct electrospinning exhibited a great application prospect in heat retention fields but are often hampered by their weak mechanical stability and flammability used in high-temperature environments. How to create such materials having the robust mechanical property, flame retardancy and efficient thermal insulation simultaneously was a huge challenge. Herein, we report on a one-step method to manufacture superelastic and lightweight 3D fibrous sponge with antiflame function. The premise of this strategy is that polysulfone (PSU) can form a stable fluffy structure in a high-humidity environment, while polyurethane (PU) can absorb deformation energy caused by external forces. By adding OP-100A, the carbonization speed of PSU/PU fibrous sponge was increased and the antiflaming property was improved. Thanks to the polymer combination strategy, the fibrous sponge prepared has excellent tensile properties with the elongation at break reaching 160%, and unique elastic energy of compression with almost no plastic deformation after 100 compressions tests. Furthermore, the fibrous sponge also has obvious advantages in ultralight property, flame retardant property and heat retention property. The successful preparation of fibrous sponge opens a new way for the development of superelastic, lightweight, and flame-retardant heat retention materials.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2022
·
IF 5.477
Bingying Gao,Chao Yao,Linqiang Mao
Background Advanced aerogels with lightweight, flame retardant and rapid cooling properties are urgently needed as thermal insulators in harsh environments. Method The Cr 2 O 3 −Al 2 O 3 aerogels were fabricated by simple method and freeze-dried process. A large number of pores were produced in the microstructure of samples by carbonization of soluble starch during calcination. Findings The porous structure makes the density of prepared Cr 2 O 3 −Al 2 O 3 aerogel as low as 0.0060 g·cm −3 and the thermal conductivity as high as 0.30 W m −1 ·K −1 , which indicates that the sample has good thermal dissipation and rapid cooling performance. The effect of calcination temperature on cooling rate was studied. The results show that material cooling can be divided into two stages, the second stage is the speed control step. With the increase of the calcination temperature, the cooling rate of sample improves and the cooling time decreases. The prepared Cr 2 O 3 −Al 2 O 3 aerogels have good flame retardancy and cannot ignite upon exposure to the burner for 2 min. The flame retardancy and rapid cooling mechanism of the sample was also studied. The Cr 2 O 3 −Al 2 O 3 aerogels have the advantages of lightweight, flame retardancy and rapid cooling, which has potential application prospects in the field of flame retardant cooling coatings.
研究领域:
材料科学
·
热能工程
✓ 已验证
DOI
高影响因子
ACS Omega
·
2020
·
IF 2.87
Dinghao Wu,Chao Ye,Yawen Liu,Jing Ren,Yuan Yao,Shengjie Ling
Light, strong, and ductile materials (LSDMs) are desired in many emerging fields, such as biomedicine, aerospace industries, and structural engineering materials. However, producing such materials remains a significant challenge because their structures cannot confer the desired mechanical properties. In this study, we developed a silk fiber “welding” strategy to construct bioinspired LSDMs. The key to the welding process is to etch the surface of silk fiber through a partial dissolution process. The dissolved silk proteins further serve as welding materials or glues to bond the silk fibers together. Remarkably, these silk-LSDMs are not only lightweight (with the densities of around 0.28 g cm–3) but also strong and tough. Their compression strength reaches up to 13.8 ± 3.4 MPa, which is higher than those of most natural and engineered porous materials. These favorable structural and mechanical characteristics, together with outstanding biocompatibility of silk proteins, render these silk-LSDMs applicable in regenerated engineered tissues and water treatment materials.
研究领域:
材料科学
·
生物医学工程
·
结构工程
✓ 已验证
DOI
高影响因子
Journal of Cleaner Production
·
2021
·
IF 9.297
Chong Fu,Jianwei Liang,Gao Yang,Abd alwahed Dagestani,Wei Liu,Xudong Luo,Baobao Zeng,Haidong Wu,Meipeng Huang,Lifu Lin,Xin Deng
With rapid economic development in recent years, the efficient utilization of waste glass has received increasing attention. The major challenge is to improve the economic and social benefits of waste glass recycling and to improve the self-driving force of waste glass recycling in related industries. In this paper, the researchers proposed a new recycling strategy for waste glass, using low-cost waste glass powder as raw material to prepare light-weight and high-strength porous ceramic materials with self-cleaning properties by combining the emulsion template self-assembly method with a surface hydrophobic coating treatment technology. The open porosity of the prepared ceramics can be controlled at 50–70% and the ceramics have ultra-high compressive strength (i.e., 50–141 MPa). The water contact angle on its surface is as high as 162.2°, which affords remarkable anti-dirt properties, stability, and superhydrophobic performance for milk, coffee, beer, soy sauce, and other staining liquids. Moreover, the water contact angle remains unchanged at a high temperature (500 °C) and in an acid-base environment. More importantly, even if the hydrophobic coating on the surface is destroyed, the superhydrophobicity and self-cleaning ability of the ceramic materials can be restored after remodification and the reuse is excellent. Ceramic materials offer the advantages of low price, a simple process, environmental protection, and high energy efficiency, and they show great potential and broad prospects for application. At the same time, the proposed method provides a very effective way to comprehensively utilize waste glass and has remarkable economic and social benefits.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Buyue Zhao,Yonghai Wang,Haiming Huang
Fibrous porous ceramics play a vital role in the field of thermal protection systems. In this work, novel lightweight Y 2 Si 2 O 7 fibrous porous ceramics were successfully prepared based on Y 2 Si 2 O 7 fibrous membranes by molding method. The effects of mechanical dispersion speed and heat treatment temperature on the properties of Y 2 Si 2 O 7 fibrous porous ceramics were characterized. The results revealed that benefiting from the appropriate fiber length, the ceramics had a better performance at a mechanical dispersion speed of 4000 revolutions per minute. The density, shrinkage, and compressive strength of the ceramics increased, but the porosity decreased slightly with the increasing heat treatment temperature. The prepared Y 2 Si 2 O 7 fibrous porous ceramics exhibited favorable properties like low density (0.37 g/cm 3 ), high porosity (90.56%), good high-temperature resistance (∼1350 °C), and low thermal conductivity (∼0.12 W m −1 K −1 at 27 °C, ∼0.566 W m −1 K −1 at 1000 °C). These properties indicate that Y 2 Si 2 O 7 fibrous porous ceramics could be a promising candidate as thermal insulation materials in high-temperature environments.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2020
·Vol. 12
·期 1
·165
·
IF 3.426
Hao Sun,Hongjie Bi,Xin Lin,Liping Cai,Min Xu
The growing demand for lightweight, renewable, and excellent thermal insulation materials has fueled a search for high performance biomass materials with good mechanical compressibility and ultralow thermal conductivity. We propose a fabrication method for making a lightweight, anisotropic, and compressible wood aerogel with aligned cellulose fibers by a simple chemical treatment. The wood aerogel was mainly composed of highly aligned cellulose fibers with a relative crystallinity of 77.1%. The aerogel exhibits a low density of 32.18 mg/cm3and a high specific surface area of 31.68 m2/g due to the removal of lignin and hemicellulose from the wood. Moreover, the multilayer structure of the aerogel was formed under the restriction of wood rays. Combined with a nanoscale pore, the aerogel presents good compressibility and an ultralow thermal conductivity of 0.033 W/mK. These results show that the wood aerogel is a high quality biomass material with a potential function of thermal insulation through optimizing structures.
研究领域:
材料科学
·
生物质工程
·
林业科学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2025
·
IF 14.3
Qiang Gao,Ping Hu,Yuxuan Xia,Yuan Cheng,Guangdong Zhao,Jiaxin Feng,Zibin Chen,Xinghong Zhang
Ultra-high temperature ceramic composites (UHTCCs) with low density and exceptional heat resistance are essential for hypersonic vehicle applications, enabling increased payload capacity and higher Mach numbers. However, developing a fabrication process that enables UHTCCs with both lightweight and superior thermal protection performance is still a challenge. To tackle this problem, in this study, a combinatorial process of vibration-assisted slurry impregnation and polymer infiltration pyrolysis was developed to fabricate gradient lightweight C f /ZrB 2 -SiC composites, consisting of continuous carbon fiber fabric, ZrB 2 -SiC and a carbon aerogels (CAs) layer. The resulting composites exhibit a low density of (0.62–0.96 g cm −3 ) but excellent oxidation and ablation resistance, which can withstand ultrahigh temperatures between 2100 °C and 2500 °C. The porous C f /CAs layer, with a density of 0.38 g cm −3 and specific bending and compressive strengths of 43.47 MPa/(g cm −3 ) and 15.53 MPa/(g cm −3 ), respectively, provides both structural integrity and lightweight properties to the C f /ZrB 2 -SiC composite. Furthermore, the density of the composites can be precisely tailored by adjusting the thickness of the C f /ZrB 2 -SiC layer, allowing for customized fabrication to meet diverse service environment requirements. This flexibility highlights the adaptability of the combined processing techniques. The unique combination of controllable low-density properties and exceptional oxidation and ablation resistance endows gradient lightweight C f /ZrB 2 -SiC composites are promising as lightweight, ultra-high temperature thermal protection systems for hypersonic vehicle applications.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 11
·2486
·
IF 3.1
Xin Tao,Yange Wan,Ruoyu Zhang,Yuqing Zhang,Yu Wang,Xiaolei Yu,Mingchao Wang
Lightweight and high-strength insulation materials have important application prospects in the aerospace, metallurgical, and nuclear industries. In this study, a highly porous silica fiber reinforced phenolic resin matrix composite was prepared by vacuum impregnation and atmospheric drying using quartz fiber needled felt as reinforcement and anhydrous ethanol as a pore-making agent. The effects of curing agent content on the structure, composition, density, and thermal conductivity of the composite were studied. The mechanical properties of the composite in the xy direction and z direction were analyzed. The results showed that this process can also produce porous phenolic resin (PR) with a density as low as 0.291 g/cm3, where spherical phenolic resin particles are interconnected to form a porous network structure with a particle size of about 5.43 μm. The fiber-reinforced porous PR had low density (0.372~0.397 g/cm3) and low thermal conductivity (0.085~0.095 W/m·K). The spherical phenolic resin particles inside the composite were well combined with the fiber at the interface and uniformly distributed in the fiber lap network. The composite possessed enhanced mechanical properties with compressive strength of 3.5–5.1 MPa in the xy direction and appeared as gradual compaction rather than destruction as the strain reached 30% in the z direction. This research provides a lightweight and high-strength insulation material with a simple preparation process and excellent performance.
研究领域:
材料科学
·
航空航天工程
·
复合材料研究
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Xianfei Xie,Xiaoyu Deng,Sheng Wang,Jianfeng Dai
Three-dimensional porous carbon-based materials have garnered significant attention due to their outstanding structural properties and remarkable microwave absorption capabilities. However, the construction of well-defined 3D carbon material structures currently relies on complex preparation processes and stringent conditions. In this study, hollow nitrogen-doped carbon flowers (HNC) with large specific surface area and multilevel pore structure were successfully prepared by a simple carbonization and etching process. This unique structure not only greatly reduces the material density, but also introduces nitrogen atoms that can generate more dipole polarization, effectively improving impedance matching and enhancing electromagnetic wave absorption performance. Notably, the material exhibits optimal electromagnetic wave absorption at a 25 % fill rate, with a minimum reflection loss (RL min ) of −55.49 dB at a thickness of 3.248 mm and an effective absorption bandwidth of 4.4 GHz. Given its straightforward preparation process, HNC holds the potential to be one of the options for high-performance microwave absorber materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 7
·期 3
·474-478
·
IF 5.976
Renji Bian,Gaoling He,Weiqiang Zhi,Shanglin Xiang,Tingwei Wang,Dongyu Cai
This work for the first time reports a freeze-casting route for fabricating an ultralight MXene aerogel (ρ < 10 mg cm−3) without using external supporters. It shows that this route is scalable for producing MXene aerogels with large sizes. These aerogels contain micro-sized pores determined by the morphology of ice crystals and demonstrate strong absorption ability for various organic solvents. More strikingly, they show excellent EMI shielding performance (up to 75 dB) with extremely low reflection (<1 dB). This gives rise to a specific shielding effectiveness of 9904 dB cm3 g−1 owing to the ultralow density of the aerogels.
研究领域:
材料科学
·
电磁学
·
纳米技术
✓ 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）