INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Fucheng Guan,Shi Feng,Jianbin Sun,Qiang Yang,Yihang Zhang,Zheng Li,Jing Tao,Xinbin Ji,Yonghe Wang,Da Bao,Jing Guo,Sen Zhang
Bio-aerogels have attracted much attention owing to their remarkable properties, but their brittle and poor elasticity has limited their further applications. Here, we propose a strategy of in-situ silanization crosslinking combined with unidirectional freeze casting (SUFC) to prepare superelastic sodium alginate (SA) aerogels. The resulting aerogel was ultra-light (0.048 g/cm 3 ), high porosity (96.86 %), and self-extinguishing from fire. Aerogels exhibited anisotropic properties, such as low-temperature elasticity (500 g compression at −70 °C 10-cycle, 99.6 % recovery), exceptional fatigue resistance (100-cycle at 50 % strain), and excellent thermal insulation (0.0696 W·m −1 ·K −1 ). Thus, the SUFC strategy provides considerable freedom for constructing multi-material, lamellar/honeycomb structured alginate-based aerogels, which pave the way to thermal insulation development at low temperatures.
研究领域:
材料科学
·
生物材料
·
能源与环境
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED ENGINEERING MATERIALS
·
2021
·Vol. 24
·期 1
·2101088
·
IF 3.862
Zhuyin Chen,Chuanzong Wu,Xinli Liu,Ting Shen,Lei Zhang
Herein, porous titanium materials with honeycomb pore structure are prepared by freeze casting. The effect of freezing temperature on the pore structure and mechanical properties is also investigated. As the freezing temperature decreases from −10 to −50 °C, the compressive strength decreases from 79.5 ± 9.2 to 55.0 ± 4.3 MPa, and then increases to 90.1 ± 4.4 MPa. Porous titanium with an average pore size of 111.3 ± 25.2 μm and porosity over 60% are obtained at −10 °C. And the porous titanium is observed to form a neatly arranged nanopore structure with an average pore size of 28.5 ± 2.8 nm on the surface after anodizing. These nanopore structures can promote MG-63 cell adhesion and proliferation, thus improving the biocompatibility of porous titanium. Further, in the simulated body fluid culture experiment, culturing for 3 days can induce Ca 2+ and PO 4 3− to nucleate and deposit on the surface of anodized porous titanium, while 7 days can deposit a lot of apatite on the surface. In contrast, no apatite deposition is observed on the surface of the porous titanium sample without anodizing. These prepared porous titanium materials with high porosity, large pore size, sufficient mechanical properties, good biocompatibility, and biological activity might be a potential biomedical material.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2024
·
IF 2.7
Xiaohua Li,Kunfeng Li,Huilong Shao,Shuang Zhao,Guobing Chen,Zhen Zhang,Zhicong Gan,Yilong Song,Zichun Yang
The freeze-casting is widely utilized as a tool for regulating micro-scale pore structures in the fabrication of flexible polyimide (PI) aerogels for applications in adsorption, filtration, and fire-retardant. Herein, a confinement-controlled freeze-casting method is developed to fabricate PI aerogels with excellent thermal insulation properties by designing multi-scale structural adaptability. In a confinement-controlled system, the enhanced solid/solid and solid/liquid interface interactions in the solution dispersion system induce dendritic evolution of ice crystals. Under the directional freezing, grown dendritic ice crystals squeeze the loaded particles to form polyamic acid salt (PAAs) cryogels. Followed by template removal and thermal imidization, PI aerogels with a micro/nano-scale slit-like porous structure were obtained. The PI aerogels are characterized by ultra-low density (as low as 9.82 mg/cm 3 ) and exceptional thermal insulation performance (25.0 mW/(m·K) at 25 °C).
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
ADVANCED ENGINEERING MATERIALS
·
2020
·Vol. 22
·期 11
·2000519
·
IF 3.217
Chuan Zong Wu,Zhu Yin Chen,Xinli Liu,Ting Shen,LiGuo Zu,Lei Zhang
Porous titanium scaffolds with high porosity and connected macropores are fabricated by adding zirconium acetate to control the ice crystal growth during freeze casting. The influences of zirconium acetate additives on the phase composition, pore structure, and mechanical properties of porous titanium are studied. As modified by zirconium acetate, the X-ray diffraction peaks of titanium moves to a smaller angle, and the zirconium is evenly distributed on the titanium matrix. With the increase in the concentration of zirconium from 0 to 60 g L −1 , the pore morphology of porous titanium changes from typical lamellar to the honeycomb, the pore size distribution becomes wider. The average pore size and porosity increases from 44 ± 11 to 126 ± 35 μm and from 46.4 ± 1.3 to 59.1 ± 1.3%, respectively. As the concentration of zirconium acetate is 40 g L −1 , the porosity and the pore size of the porous titanium scaffolds are comparable with those modified by 10 g L −1 zirconium acetate, but the compressive strength is 2.3 times higher. Zirconium acetate as an additive has an excellent performance in optimizing the pore structure and mechanical properties of water-based freeze-cast porous titanium.
研究领域:
生物材料学
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组织工程
·
金属材料科学
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医用植入材料
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多孔材料
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2021
·
IF 4.527
Linghao Wu,Cuiwei Li,Yufeng Chen,Chang-an Wang
Porous anorthite/mullite whisker ceramics with both high strength and low thermal conductivity have been successfully prepared by combining seed-assisted in situ synthesis and foam-freeze casting techniques. The addition of mullite seed was conducive to a reduction in the sintering shrinkage, pore size, and anorthite grain size. This increased the high aspect ratio of mullite whiskers, which enhanced the strength and diminished the thermal conductivity. Mullite whiskers overlapped to form a stable three-dimensional network structure similar to the bird's nest, which was also beneficial to heighten the mechanical properties of the prepared porous ceramics . Through this method, the prepared materials had a high apparent porosity of 87.7–90.2%, a low bulk density of 0.29–0.36 g/cm 3 , a high compressive strength of 0.65–3.31 MPa, and low thermal conductivity of 0.067–0.112 W/m·K. The results indicated that the method described here can fabricate porous ceramics with excellent properties for further thermal insulating applications.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2021
·
IF 5.302
Lei Han,Longhao Dong,Haijun Zhang,Faliang Li,Liang Tian,Guangqiang Li,Quanli Jia,Shaowei Zhang
With the rapid development of energy sources and aerospace engineering, high-performance thermal insulation materials with multiple functions are attracting more and more attentions. Non-oxide ceramic aerogels have application potential in thermal insulation under harsh conditions owing to their good thermal insulation performance and chemical stability. In this work, TiN aerogels were prepared by a combined freeze-casting and carbothermal reduction-nitridation method utilizing TiO 2 and chitosan as raw materials, at 1473 K for 3 h, with a C/TiO 2 molar ratio of 3/1. They showed a specific surface area of 167 m 2 /g and ultralow density of 0.07 g/cm 3 (the relative density of 1.3 %). Their thermal conductivity value was only 0.166 ± 0.0054 W/(m K at 673 K (TiO 2 solid content of 5 wt%). Moreover, the prepared aerogels possessed reasonably high mechanical strength and good high-temperature service performance, suggesting that they can be used under high-temperature conditions as an insulation material.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2020
·
IF 4.495
Yushi Qi,Kai Jiang,Changling Zhou,Wenbo Han,Zhiming Du
The development of novel cermet composites based on porous ceramics with high porosity, interconnected pore structure and good mechanical property has attracted considerable attention in engineering application. In this work, water-based freeze casting process was employed to fabricate ZrB 2 -SiC porous ceramic with aligned lamellar-channels structure using PAA-NH 4 as the dispersant. The results revealed that the well-dispersed suspension with best rheological behavior was obtained using 1.0 wt% PAA-NH 4 at pH 9. The crack-free porous ceramic exhibited small volume shrinkage ranging from 2.59 % to 1.87 %. By varying the solid loading, the fabricated samples displayed a tailored porosity ranging from 76.12% to 59.37% and an excellent compressive strength of 7 MPa to 78 MPa. After oxidation, the samples displayed a decreased porosity and an increased compressive strength. The ZrB 2 SiC porous ceramic fabricated in this work will be a promising candidate for the framework of cermet composite.
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
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Qiang Zhi,Shan Zhao,Nan-Long Zhang,Bao-Qiang Hou,Bo Wang,Jian-Feng Yang
The directional freezing of β-Si 3 N 4 whiskers suspensions followed by high-temperature sintering was employed for fabricating novel highly porous fibrous Si 3 N 4 three-dimensional (3D) scaffolds. A honeycomb-like structure was achieved, in which the directionally aligned lamellar walls were composed of the oriented fibrous Si 3 N 4 grains and bridged by the transverse grains. Ultrahigh porosities ranging from 97.8% to 90.2% and rather low densities from 0.073 to 0.320 g cm −3 could be obtained by controlling the Si 3 N 4 contents from 1.5 to 7.5 vol%. The longitudinal compressive strength was superior to the transverse and increased obviously from 0.19 to 3.7 MPa as the porosity decreased. The superior compressive strength was due to the excellent resistance to bucking-induced elastic instability for the lamellar fibrous Si 3 N 4 walls. Meanwhile, the dielectric constant and loss were decreased to 1.08 and 6.6 × 10 −4 , respectively. This study provides a strategy for fabricating porous Si 3 N 4 ceramics with ultrahigh porosities and improved strength.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Yunfei Li,Min Deng,Fan Chen,Yan Yan Farm,Ade Kurniawan,Peizhong Feng,Nan Sheng,Chunyu Zhu
Phase change materials (PCMs) have been widely applied in thermal energy storage and thermal management due to their high energy storage density, and good temperature stability during phase transitions. To address the critical problems of low thermal conductivity and leakage tendency of organic solid–liquid PCMs, this paper reports a simple, rapid and low energy input route for preparing porous AlN with bi-directional structure by freeze-casting combined with combustion synthesis, which are used as highly thermal conductive skeletons to support paraffin PCM. The highly porous AlN skeletons can avoid the leakage of melted paraffin, and when the AlN mass load was 56.74 wt% in the phase change composite (PCC), the thermal conductivity in horizontal and axial directions reach 15.63 and 11.72 W m −1 K −1 , respectively, which are 78.2 and 58.6 times higher than that of paraffin. Meanwhile, the PCC exhibits a good enthalpy of 82.3 J g −1 , which remains stable after long-term cycles of reversible phase changes. The bi-directional heat transfer enhancement provides the PCC with significant potential for applications in the thermal storage and thermal management.
研究领域:
材料科学
·
热工学
·
储能技术
·
复合材料
✓ 已验证
产品关联
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Xuexia Zhang,Minghui Liu,Hankun Wang,Ning Yan,Zhiyong Cai,Yan Yu
Cellulose aerogels have shown outstanding potential as renewable functional materials; however, their practical applications are still limited by inherent hydrophilicity and weak mechanical properties. To overcome hydrophilicity and fragility issues of aerogels, in this study, silylated bamboo-derived cellulose nanofibrils (CNF) aerogels with aligned porous structures were achieved by directionally freeze-casting a mixture of CNF suspension and methyltrimethoxysilane sol. The silylated CNF aerogels exhibited distinct aligned lamellar structures and significantly anisotropic mechanical properties. They had improved strength and stiffness in the axial direction (along the freezing direction) and excellent rapid shape recovery ability in the radial direction (perpendicular to the freezing direction) with a significant high shape recovery ratio of 92% after 100 cycles at 80% compression. Owing to their ultra-low density, hydrophobicity, and high compressive recoverability, the silylated CNF aerogels can be potentially used in a wide range of industrial applications, such as hydrophobic polymer nanocomposites, absorbents, and biomedical scaffolds.
研究领域:
材料科学
·
生物质材料
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 22
·9941-9951
·
IF 3.5
Zeng Dawei,Zhou Jiaxin,Wu Zhen,Sun Luchao,Wang Jingyang
Ultra-high temperature ceramics (UHTCs) are considered as promising thermal insulation materials applied in ultra-high temperature environments (> 2000 °C). However, the high thermal conductivity and high density limit their further development and application. Herein we adopt the strategies of introducing porous structure and high-entropy effect to solve the above problems. Thus porous high-entropy (Zr 0.25 Hf 0.25 Nb 0.25 Ti 0.25 )C ceramics were prepared. In order to obtain the uniform pore structure and high mechanical property, the camphene-based freeze-casting method was used in this study. The as-prepared porous samples exhibit high porosity of 92.01–73.57% and homogeneously interconnected pore structure with average pore size of 40.8–19.6 μm. Besides, this work realizes the aims of lightweight (0.65–2.15 g/cm 3 ) and low thermal conductivity (0.29–1.53 W/(m·K)). More importantly, porous samples still have the merit of high compressive strength (0.38–29.02 MPa) due to the even microstructure. The results show that highly porous high-entropy (Zr 0.25 Hf 0.25 Nb 0.25 Ti 0.25 )C with good overall properties can be an excellent candidate material for ultra-high temperature thermal insulation.
研究领域:
材料科学
·
陶瓷
·
热工学
·
机械工程
✓ 已验证
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Ruiqi Li,Yuan Liu,Jie He,Chunhong Zhang,Jianwei Bai,Yueling Sun,Wenxin Diao,XiaoYan Tang
The technology of solar-driven interfacial water evaporation (SDWE) is a promising approach for producing freshwater, which addresses the challenges of water scarcity and aims for sustainable desalination. However, the low rate of evaporation poses a major obstacle to the broader implementation of SDWE technology. In the present research, drawing inspiration from the porous structure of natural wood, we developed hydrogel evaporators with vertically aligned channels adjusting pore sizes, composed of polyacrylamide/hydroxypropyl cellulose, through directional freeze casting techniques. In view of excellent superhydrophilic properties and adjustable aperture, the transport of water was improved to meet the requirement of thermal management preferably, effectively reducing heat loss. Furthermore, by optimizing hydratable polymeric network within the polyacrylamide/hydroxypropyl cellulose evaporator, the enthalpy of water evaporation could was reduced, resulting in a higher evaporation rate. The hydrogel evaporator prepared achieved a remarkable rate of 2.68 kg m −2 h −1 and an efficiency of 90.0 % under irradiation of 1 sun. In addition, this hydrogel evaporator displayed excellent resistance to salt and maintained stability during evaporation, making it a viable option for purifying various non-potable water types. Thus, this research provides an innovative perspective for improving the efficacy of solar-driven interfaces in processes such as seawater desalination and wastewater treatment by managing water transport and decreasing evaporation enthalpy.
研究领域:
材料科学
·
环境工程
·
能源技术
✓ 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）