Arabian Journal of Chemistry
·
2020
·
IF 4.762
Lang Wen,Xuedan Chen,Chao Chen,Ruisong Yang,Min Gong,Yiguo Zhang,Qingshan Fu
Chitosan/MOF composite porous monolith used in water remediation as adsorbent can realize high-efficient removal of pollutant in water and facile recycling from water. However, dissolution of chitosan (without crosslinking) in acidic aqueous solution will cause breakage of composite monolith. Herein, we report a chitosan/UiO-66 monolith prepared by ice-templating method. Specially, a pre-crosslinking treatment (by glutaraldehyde) is employed before the monolith formation, which obviously boosts its stability in aqueous solution. The composite monolith is evaluated by SEM, N 2 adsorption, XRD, and batch adsorption tests for Congo Red (CR). The results show that the composite monolith possesses a typical ice-templating structure with hierarchical (mirco- / meso- and macro-) pores. UiO-66 particles are embedded on the surface of chitosan matrix, and the crystal structure of UiO-66 is not changed obviously by the crosslinking and freezing process. The composite monolith exhibits high adsorption efficiency (90% of CR was removed from its aqueous solution in 60 min) and the maximum adsorption capacity of 246.21 mg/g (derived from Langmuir model) can be reached. After adsorption, the monolith is collected by a facile procedure and recovered using ethanol for evaluating its reusability. After 4 cycles, the CR removal efficiency of the composite monolith still remains ~90% of the initial efficiency. This work demonstrates that the simple crosslinking procedure before monolith formation can ensure the intact shape of the chitosan/MOF monolith during adsorption.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2022
·
IF 6.449
Meiling Zhang,Mengmeng Li,Qiuyu Xu,Wei Jiang,Mohan Hou,Lefan Guo,Ni Wang,Yanjiao Zhao,Lifang Liu
Nanocellulose-based aerogels are widely used in various fields due to the lightweight and porous features. The pore structure plays a decisive role in the performances, but controllable fabrication of the nanocellulose-based aerogel with a tunable structure is still a challenge. Herein, we reported a facile approach to prepare nanocellulose aerogel with a designable pore structure by ice-induced self-assembly. The relationship between the properties and structure was investigated by simply tuning factors such as temperature gradient, freezing rate, infiltration interface, and solute concentration. The as-prepared aerogel exhibited regulable density (2.35–15.96 mg/cm 3 ), pore size (2 nm-500 µm), and desirable flexibility which is suitable for thermal insulation application. The research provides new insight into the controllable preparation and functional application of nanocellulose-based aerogels.
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 FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jiaojiao Feng,Yiqing Zhou,Zetong Zhuang,Haonan Xiong,Chun Li
Sodium alginate (SA) aerogels have received extensive attention in environmental modification, energy-related systems, and thermal insulation due to their good processability, nontoxicity, and biodegradability. However, achieving superior mechanical properties remains a significant challenge for SA aerogels as engineering materials. In this work, superstrong SA aerogels are prepared via an effective in situ crosslinking method, consisting of ice-templated preassembly followed by a specially designed dissolution process in mixing GDL/EtOH/H 2 O (δ-glucolactone/ethanol/water) solution. Upon optimization of heat and mass transfer during the ice dissolution process, along with the unique ice template effect, a homogeneous, highly crosslinked, and long-range oriented structure in high-solid fraction SA matrices is obtained. The resultant SA aerogels (248.0 ± 4.4 mg cm −3 ) exhibit an outstanding specific modulus of 1.45 ± 0.15 GPa cm 3 g −1 ( E = 360 ± 32 MPa, σ y = 14.8 ± 0.8 MPa), remarkable energy absorption capability (32.1 ± 4.4 kJ kg −1 ), and considerable thermal insulation performance (0.044 ± 0.007 W m −1 K −1 ). The present strategy paves a way for the fabrication of high-performance SA-based engineering materials with well-oriented microstructures and superior multifunctionality.
研究领域:
材料科学
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环境科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2023
·Vol. 20
·期 5
·2737-2746
·
IF 2.1
Zhaoping Hou,Xinhe Yang,Zihan Tian,Liangliang Liu
Porous Al 2 O 3 ceramic beads with a small-scale lamellar pore structure were prepared by the dripping-ice templating method. The densification behavior of lamellar walls and the attrition resistance of porous Al 2 O 3 beads were investigated. For the two-dimensional structural lamellar walls, the intrinsic pores shrunk, and the necking area grew during the sintering process, leading to the densification of lamellar walls and the shrinking of porous beads. In addition, the two-dimensional lamellar walls and three-dimensional Al 2 O 3 bulk are compared and possibilities of elaborating of the discrepancy in grain size and pore morphology are discussed. Attrition resistance was determined by a grinding test. The dominant attrition mechanism of porous Al 2 O 3 beads is abrasion. High sintering temperature led to a decrease in the attrition rate due to a wider necking area and denser pore walls.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
AICHE JOURNAL
·
2016
·Vol. 62
·期 12
·4186-4192
·
IF 2.98
Miao Yang,Jingjun Wu,Hao Bai,Tao Xie,Qian Zhao,Tuck-Whye Wong
Significance Directional freezing (DF) is a fast, scalable, and environmental friendly technique for fabricating monoliths with long-range oriented pores, which can be applied toward a wide variety of materials. However, the pore size is typically larger than 20 μm and cannot be spatially controlled, which prevent the technique from being used more widely. In this work, effect of wettability of the freezing substrate on the pore size of monolithic polyethylene glycol cryogels is studied. Smaller pores can be generated via more hydrophilic substrates, and tubular pores smaller 5 μm can be created using a poly(vinyl alcohol) coated copper substrate. A numerical fitting between water contact angle of the substrates and pore size is then obtained. Moreover, pore size can be locally varied duplicating wetting patterns of the substrates. The concept of using two dimensional patterns to build monoliths with three dimensional microstructures can probably be extended to other material systems. DF is an effecient and scalable processing method for fabricating materials with long-range oriented pores. However, the smallest pore feature size reported is around 20 µm, which is in many cases too large for application such as separation and catalysis. We show here, with exemplary cryogels, that both spatial control and feature size reduction (by one order of magnitude) can be realized in DF by controlling the wettability of the ice growth substrate. © 2016 American Institute of Chemical Engineers AIChE J , 62: 4186–4192, 2016
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2015
·Vol. 11
·期 46
·6205-6213
·
IF 8.368
Xiaoliang Zeng,Yimin Yao,Zhengyu Gong,Fangfang Wang,Rong Sun,Jianbin Xu,Ching-Ping Wong
Owing to the growing heat removal issue of modern electronic devices, polymer composites with high thermal conductivity have drawn much attention in the past few years. However, a traditional method to enhance the thermal conductivity of the polymers by addition of inorganic fillers usually creates composite with not only limited thermal conductivity but also other detrimental effects due to large amount of fillers required. Here, novel polymer composites are reported by first constructing 3D boron nitride nanosheets (3D-BNNS) network using ice-templated approach and then infiltrating them with epoxy matrix. The obtained polymer composites exhibit a high thermal conductivity (2.85 W m −1 K −1 ), a low thermal expansion coefficient (24–32 ppm K −1 ), and an increased glass transition temperature ( T g ) at relatively low BNNSs loading (9.29 vol%). These results demonstrate that this approach opens a new avenue for design and preparation of polymer composites with high thermal conductivity. The polymer composites are potentially useful in advanced electronic packaging techniques, namely, thermal interface materials, underfill materials, molding compounds, and organic substrates.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2025
·
IF 8.9
ZhiWei Ling,Qiuchen Wang,Bin Wu,Ru Xia,Jiasheng Qian
The ability to dissipate accumulated heat in integrated circuits determines the performance, safety, and service life of electronic devices. The regulation of orderly heat transfer pathways in composites is a breakthrough to improve the heat dissipation performance. Herein, the heat transfer property of PI-based composites along the horizontal direction was realized by twice regulation of ice-templating and hot-pressing on the transfer pathways composed of boron nitride-coated silver wires (AgNWs@BN-NH 2 ). The in-plane thermal conductivity (4.14 W m −1 K −1 ) of nearly 15 times greater than the through-plane thermal conductivity (0.28 W m −1 K −1 ) manifested the anisotropic heat dissipation capacity of the AgNWs@BN-20/PI 10 . The heat transfer behavior of composites under pressure was further analyzed by finite element simulation. The change of the pressure value mapped in the model structure indicated that the secondary regulation achieved the optimal horizontal heat transfer effect. Due to the insulating and flame-retardant nature of BN-NH 2 , AgNWs@BN-20/PI 10 exhibited volume resistivity of over 10 14 Ω, limited oxygen index of ∼ 38 %, and peak heat release rate of less than 20 W g −1 . This strategy offers a promising idea for the development of multifunctional polymer-based thermal management materials with directional heat transfer performance in the electronic applications.
研究领域:
材料科学
·
热管理技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Shoujuan Lai,Chunxiao Lv,Shuai Chen,Ping Lu,Xilin She,Li Wan,Hongwei Wang,Jin Sun,Dongjiang Yang,Xiaoliang Zhao
Transition metal phosphides (TMPs) have been regarded as an alternative to Pt-based catalysts for hydrogen evolution reaction (HER) on account of their high performance and low cost. The ultrathin two-dimensional (2D) nanosheets of TMPs can expose abundant active sites and facilitate the transfer of mass/charge to enhance HER performance. However, the synthesis of ultrathin 2D nanosheets of TMPs is still a great challenge. Herein, we reported a novel and scalable strategy to prepare 2D ultrathin nickel phosphide nanosheets (∼2.5 nm) by using alginate as precursor through ice-templating process. The role of ice-templating is that the growth of the ice crystals would squeeze Ni-alginate into 2D nanosheets, and then forming Ni-alginate aerogels . The three-dimensional (3D) interconnected porous network of aerogels was advantageous to reduce the lattice strains of subsequent oxidation and phosphorization process. It is the key step to prepare 2D ultrathin nickel phosphides (Ni 2 P and Ni 5 P 4 ) nanosheets. As expected, all the prepared Ni 5 P 4 nanosheet aerogels displayed remarkable HER performance in 1 M KOH electrolyte. Especially, due to their ultrathin 2D nanosheets and high P percentage, the Ni 5 P 4 -500-350 sample with excellent long-term stability exhibits a low overpotential of 147 mV at current density of 10 mA cm −2 and a low Tafel slope of 57 mV dec −1 .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 32
·期 39
·2205309
·
IF 19.924
Meng Li,Nifang Zhao,Mengning Wang,Xuangeng Dai,Hao Bai
Biological structural materials realize outstanding mechanical properties by assembling hard and soft components into complex hierarchical structures, which provide abundant inspirations for synthetic materials. Specifically, conch shell exhibits around ten times higher toughness than widely-explored nacre due to its cross-lamellar architecture at nano- to macroscopic scales. Previously, conch-shell-inspired materials are realized by 3D-printing. However, it remains challenging to translate the properties of conch shell into synthetic materials because of the limited approaches to duplicating complex architecture with high ceramic contents. Here, a surface-pattern-induced ice-templating strategy is reported to fabricate conch-shell-inspired composites with a cross-lamellar structure across a 10 7 -fold range of length. This is realized by directional freezing on a grooved surface, which has previously been confirmed to induce preferential ice growth. These composites have a flexural strength of 165 MPa and a work of fracture of 8.2 kJ m –2 , which are 2.5 and 2 times, respectively, higher than those of conch shell. Such conch-shell-inspired structure yields a toughness twice that of nacre-mimetic structure due to multiple crack deflections. Additionally, the impact resistance of these composites is comparable to those of aluminum alloys. The research provides a feasible approach to fabricating bioinspired materials with complex architectures and multifunctionality.
研究领域:
材料科学
·
生物力学
·
制造工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2021
·
IF 7.664
Bin Wu,Jiaojiao Li,Xu Li,Gang Qian,Peng Chen,Ru Xia,Jiasheng Qian
Polymer-based thermal conductivity composites composed with nanoscale fillers are promising thermal conductors to dissipate accumulated heat of integrated circuits in electronic devices, while interfacial thermal resistance (ITR) and disordered conductive pathways caused by the size effect of fillers limit their heat transfer performance. Herein, gravitational-driven ice-templated oriental arrangement of ionic liquid (IL) modified microscale carbon fibers (CFs) were conducted to improve thermal conductivity via both weakening phonons scattering effect and forming horizontal orientation heat transfer pathways in composites. The cation-π interaction between CFs and the hydrogen bonding between CFs and epoxy resin induced by IL effectively reduced ITR in composites. As a result, the composite including 22.3 vol% CFs reached a maximum in-plane thermal conductivity of 7.98 W m −1 K −1 . The mechanical properties of the composite were also developed. This insight provides a strategy for the construction of high-performance composites with potential applications in thermal management materials.
研究领域:
材料科学
·
热管理材料
✓ 已验证
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 41
·1802824
·
IF 9.598
Hui Li,Xiaoliang Zhao,Hongli Liu,Shuai Chen,Xianfeng Yang,Chunxiao Lv,Huawei Zhang,Xilin She,Dongjiang Yang
Transition metal phosphides (TMPs) are certified high performance electrocatalysts for the hydrogen evolution reaction (HER). The ultrathin 2D structure of TMPs can offer abundant adsorption sites to boost HER performance. Herein, an ice-templating strategy is developed to prepare CoP aerogels composed of 2D ultrathin CoP nanosheets (<1.5 nm) using sustainable alginate biomass (seaweed extract) as the precursor. The highly porous aerogel structure can not only deliver facile mass transfer, but also prevent aggregation of the nanosheets into layered structures. As expected, the obtained CoP nanosheet aerogels exhibit remarkable stability and excellent electrocatalytic HER performance at all pH values. For instance, the sample CoP-400 presents a low overpotential of 113, 154, and 161 mV versus RHE at a current density of 10 mA cm −2 in 0.5 m H 2 SO 4 , 1 m KOH, and 1 m phosphate buffer solution, respectively. In addition, CoP-400 displays low Tafel slopes at all pH values due to the interconnected highly porous structure of the aerogel, indicating that the sample can provide low-resistance channels for mass transport. Density functional theory calculations reveal that P-top and Co bridge on (011) facet of CoP are more favorable sites during the process of HER in acid and alkaline solutions, respectively.
研究领域:
材料科学
·
电化学
·
催化
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Xingyu Yi,Rui Zhou,Liang Liu,Shirong Xu,Hong Sun,Kenji Ogino,Yimin Fan
Formaldehyde (FO) and nanochitin suspension (DEChN) were combined to synthesize stable hydrogels via ice-templated chemical/physical crosslinking. The synthesis process involved the mixing of formaldehyde and nanochitin, followed by ammonia-induced gas phase coagulation to achieve dual crosslinking, thereby enhancing the mechanical properties of the hydrogels. The chemically crosslinked hydrogel exhibited a storage modulus of 680.05 Pa, whereas the demonstrated an approximately 5-times increase in storage modulus of 3110.34 Pa for DEChN(5)/FO(1), along with a reduced surface area and improved structural stability. Filtration experiments revealed that the dual-crosslinked hydrogel achieved nearly complete removal of microplastics (∼3 μm in diameter), with a flux of 8.22 mL cm −2 h −1 , outperforming both the chemically (5.05 mL cm −2 h −1 ) and physically (3.01 mL cm −2 h −1 ) crosslinked samples. This enhanced performance was attributed to the larger pore size and robust channel structure in dual crosslinked hydrogels. The nanochitin hydrogels offered a more straightforward fabrication process, superior filtration efficiency, and cost-effectiveness, highlighting their scalability for practical water purification systems.
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
危险品化学品经营许可证（带存储）