POLYMER
·
2025
·
IF 4.5
Bowen Tan,Liming Tao,Shoubing Chen,Zenghui Yang,Qihua Wang,Lihe Guo,Zhangzhang Tang,Rui Yang,Qian Dou,Xinrui Zhang,Yuqi Li,Tingmei Wang
Developing polyurethane that can withstand ultra-low temperatures is key to expanding its applications in low-temperature environments. Spider silk demonstrates high toughness in low-temperature environments due to its hierarchical hydrogen bonds network. Inspired by spider silk, a polyurethane elastomer (SPU-DTP x ) with exceptional strength, superior toughness, low-temperature resistance, and recyclability were synthesized. The dense hydrogen bonds in the urethane bonds lead to curled and entangled molecular chains at low temperature. SPU-DTP 0.8 achieves a maximum tensile strength of 86.71 MPa, maximum elongation at break reaching 226.93 % at −90 °C, with toughness of SPU-DTP 0.8 of 109.98 MJ m −3 , only 37.27 % lower than that at 20 °C. Utilizing hydrogen bonds and molecular chain migration, SPU-DTP 0.8 demonstrates excellent recyclability, maintaining key mechanical properties after reprocessing. This elastomer could endure extreme supercold temperatures and offer considerable promise for creating elastic devices, flexible spacecraft, and soft robots designed for use in extremely low-temperature environments like outer space or polar areas.
研究领域:
材料科学
·
生物仿生学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Xiaoyu Li,Naichao Chen,Jin Cheng,Xianqiang Chen,Biao Guo,Fei Jin,Hong Wang
The Li 2 MoO 4 -MoO 3 ceramic system can be densely sintered at ultralow temperatures (< 500 °C). However, the phase composition of the Li 2 MoO 4 -MoO 3 system at a molar ratio of 1:1 has always been controversial. In this study, the traditional solid-state method was used to synthesize Li 4 Mo 5 O 17 (400 °C, 10 h) and Li 2 Mo 2 O 7 (350–400 °C, 4 h). Li 2 Mo 2 O 7 is an intermediate phase that can be converted to Li 4 Mo 5 O 17 at higher temperatures. The Li 4 Mo 5 O 17 ceramic could be sintered and densified at only 490 °C in air, exhibiting a relative density of 95.6% and excellent dielectric properties , including ε ′= 12.79 and tan δ = 0.0004 at 1 GHz. Such an ultralow sintering temperature and dielectric loss indicate that the Li 4 Mo 5 O 17 ceramic is a good candidate for high-frequency capacitance applications.
研究领域:
材料科学
·
电子材料
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Qiuyan Quan,Tianyu Zhao,Zhuo Luo,Bai-Xue Li,Hao Sun,Hao-Yu Zhao,Zhong-Zhen Yu,Dongzhi Yang
Although conductive hydrogel-based flexible electronic devices have superb flexibility and high conductivities, they tend to malfunction in dry or frigid areas. Herein, an ultralow-temperature tolerant, antidrying, and conductive composite hydrogel is designed for electronic skin applications on the basis of the synergy of double-cross-linked polymer networks, Hofmeister effect, and electrostatic interaction and fabricated by in situ free radical polymerization of 2-acrylamido-2-methyl-1-propanesulfonic acid and acrylic acid in the presence of poly(vinyl alcohol) and conductive MXene sheets, followed by impregnation with LiCl. Thanks to the synergy of LiCl and the charged polar terminal groups of the synthesized polymers, the composite hydrogel can not only bear an ultralow temperature of −80 °C without freezing but also maintain its original mass. Meanwhile, the resultant hydrogel possesses satisfactory self-regeneration ability benefiting from the moisturizing effect of LiCl. The conductive network of MXene sheets greatly improves the ionic conductivity of the hydrogel at low temperatures, exhibiting an ionic conductivity of 1.4 S m–1 at −80 °C. Furthermore, the electronic skin assembled by the multifunctional hydrogel is efficient in monitoring human motions at −80 °C. The antifreezing and antidrying features along with favorable ionic conductivity, high tensile strength, and outstanding flexibility make the composite hydrogel promising for applications in frigid and dry regions.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2021
·Vol. 33
·期 36
·2102096
·
IF 30.849
Qiang Ma,Shenglong Liao,Yingchao Ma,Yanji Chu,Yapei Wang
Elastomers presenting good elasticity, ductility, and chemical resistance at low temperatures can serve as superior performers for explorations in extremely cold environments. However, no commercially available elastomer to date can comprehensively fulfill those demands. Here, a perfluoropolyether (PFPE)-based network crosslinked by dynamic urethane chemistry is demonstrated, which may satisfy the demands of application in ultracold environments. As the crucial constitute in such a crosslinked network, PFPE provides the elastomer with excellent elasticity at a temperature down to −110 °C and outstanding ductility within the cryogenic temperature range. Importantly, the high proportion of fluorocarbon segment also provides wonderful compatibility to most organic solvents, accounting for the low-swelling characteristics of the elastomer in sealing applications. Furthermore, the dynamic crosslinking feature allows the cured elastomer to be reprocessed like thermoplastic polymers, which affords great promise to recycle and reuse the elastomer after its disposal. Inherently, this elastomer would inspire a worldwide interest in the design of elastic devices that are adaptable to extremely low temperature.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Chongjie Zhang,Xiang Xu,Niyu Yao,Chunhao Wang,Juan Guan,Zheng Zeng,Liqing Li
Environmental problems caused by the utilization of fossil energy are becoming more and more serious, so now more attention has been paid to the use of renewable energy. Pyrolysis of biomass is a method that convert biomass energy into hydrogen, but this method is subject to the performance of the catalyst for the pyrolytic reaction. In this study, NiCo 2 O 4 was synthesized by coprecipitation method and examined by microstructure and textual characterizations. The ability of NiCo 2 O 4 to pyrolyze toluene and produce hydrogen was evaluated by temperature-programmed experiment and lifetime test. It was found that the sample could pyrolyze toluene at the concentration of 1500 ppm at 300 °C with a hydrogen production of 0.6%, suggesting toluene was completely pyrolyzed. In the longevity test, toluene can be completely pyrolyzed for at least 5 h at 400 °C, with a high hydrogen yield of above 80% maintained during the pyrolysis process. As the pyrolysis reaction progresses, NiCo 2 O 4 was gradually reduced to nickel-cobalt alloy by hydrogen from the pyrolysis of toluene, indicating the actual active site of nickel-cobalt alloy. This study gives a hint for developing a good catalyst for the ultra-low temperature biomass pyrolysis to produce hydrogen.
研究领域:
能源科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2022
·
IF 8.025
Chenmin Zheng,Wanping Huang,Yuping Zou,Wensi Huang,Peng Fei,Guoguang Zhang
In this study, pectin was modified with phenylalanine by ultra-low temperature enzymatic method to improve its gel properties. The grafting ratio of phenylalanine amidated pectin was studied under different reaction conditions. The highest value (29.21 %) was reached a reaction temperature of −5 °C and time of 12 h. Further analysis indicated that phenylalanine and high methoxyl pectin combined at the solid-liquid two phase interface under the catalysis of papain to form phenylalanine amidated pectin. Moreover, the physicochemical properties of pectin hydrogel and its feasibility as a sustained-release drug carrier were discussed. The results showed that phenylalanine amidated pectin can form hydrogel with a certain strength under acidic conditions, and there is no need to add a lot of soluble solids and divalent cations. Besides, the phenylalanine amidated pectin hydrogel as a sustained release carrier of drugs showed more sustained and complete drug release.
研究领域:
材料科学
·
药学
·
生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 107
·期 7
·4878-4890
·
IF 3.5
Qi Yuan,Yutong Meng,Tao Wang,Wencai Hu,Sen Wang,Gaobin Liu,Qiyao Wang,Kuoming Song,He Zhao,Shuai Yan,Xin Li
Li 2 (Mg 1– x Cu x ) 2 Mo 3 O 12 (0 ≤ x ≤0.1) ceramics were prepared using the conventional solid-phase method to study the effect of the Cu 2+ substitution for Mg 2+ on the sintering behavior, crystal structure, and microwave dielectric properties of ceramics. The experimental results show that the substitution of Cu 2+ for Mg 2+ reduces the sintering temperature of the ceramics to 550°C. X-ray diffraction patterns show that the introduction of Cu 2+ does not produce a new phase, but rather promotes the formation of Li 2 (Mg 1– x Cu x ) 2 Mo 3 O 12 solid solution. The microwave dielectric properties of the ceramics are influenced by the cell parameters, bond lengths, and structural stability. However, Cu 2+ creates oxygen vacancies during sintering, thereby deteriorating the dielectric properties ( Q × f decreases). The microwave dielectric properties of Li 2 (Mg 1– x Cu x ) 2 Mo 3 O 12 ceramics are optimal at a sintering temperature of 550°C and x = 0.02, with ε r = 9.17, Q × f = 7960 GHz, and τ f = –58.77 ppm/°C. Additionally, these ceramics are compatible with Al electrodes.
研究领域:
材料科学
·
晶体学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2019
·Vol. 30
·期 5
·5008-5013
·
IF 2.195
Du Liting,Liu Li,Tang Xiaonian,Li Yu,Xu Suyan,Gong Yimin,Yang Yang
Pure Fe 2 O 3 microspheres and Gd 2 O 3 /Fe 2 O 3 loose microspheres were synthesized successfully by a facile hydrothermal method and followed with calcined. The structure and elemental composition were provided by the X-ray powder diffraction (XRD) and energy-dispersive spectroscopy (EDS). Additionally, the morphology was characterized by scanning electron microscope (SEM) and transmission electron microscope (TEM), which show the loose surface state of Gd 2 O 3 /Fe 2 O 3 microspheres. Finally, the property of the gas-sensing sensor based on Gd 2 O 3 /Fe 2 O 3 loose microspheres was investigated systematically. It exhibits ultrahigh sensitivity of 268.6 to 100 ppm acetone at low operating temperature 220 °C, which is 9.8 times higher than the pure Fe 2 O 3 microspheres sensor (27.5/100 ppm). Remarkably, the response of Gd 2 O 3 /Fe 2 O 3 loose microspheres sensor to 0.1 ppm acetone is 2.3. Furthermore, the sensor shows fast response and recovery time (6/36 s) and splendid selectivity to acetone.
研究领域:
材料科学
·
传感技术
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2020
·Vol. 30
·期 27
·2001619
·
IF 16.836
Jiaxin Li,Lie Wang,Yang Zhao,Shangyu Li,Xuemei Fu,Bingjie Wang,Huisheng Peng
Lithium-carbon dioxide (Li-CO 2 ) batteries are considered promising energy-storage systems in extreme environments with ultra-high CO 2 concentrations, such as Mars with 96% CO 2 in the atmosphere, due to their potentially high specific energy densities. However, besides having ultra-high CO 2 concentration, another vital but seemingly overlooked fact lies in that Mars is an extremely cold planet with an average temperature of approximately −60 °C. The existing Li-CO 2 batteries could work at room temperature or higher, but they will face severe performance degradation or even a complete failure once the ambient temperature falls below 0 °C. Herein, ultra-low-temperature Li-CO 2 batteries are demonstrated by designing 1,3-dioxolane-based electrolyte and iridium-based cathode, which show both a high deep discharge capacity of 8976 mAh g −1 and a long lifespan of 150 cycles (1500 h) with a fixed 500 mAh g −1 capacity per cycle at −60 °C. The easy-to-decompose discharge products in small size on the cathode and the suppressed parasitic reactions both in the electrolyte and on the Li anode at low temperatures together contribute to the above high electrochemical performances.
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Chenmin Zheng,Yuping Zou,Yufan Huang,Bihua Shen,Peng Fei,Guoguang Zhang
In traditional industry, amidated pectin was usually prepared by adding ammonia gas under the alkaline condition or ethanol system which degrades the galacturonic acid chain of pectin and weakens the advantage of amidated pectin in gel. In this study, amidated pectin with ultra-high viscosity and low gelation restriction were prepared by grafting with the neutral aliphatic amino acids through enzymatic method at ultra-low temperature to extend the application of the pectin in food , daily use chemical, medicine and other fields. The amino acid grafting ratio of alanine amidated pectin (V-PE), valine amidated pectin (A-PE) and leucine amidated pectin (L-PE) were 14.12%, 24.36% and 18.94%, respectively. The results of dynamic viscosity showed that the dynamic viscosity of high methoxy pectin (HMP) increased from 186 to 39799 (V-PE), 20396 (A-PE) and 23781 mPa s (L-PE), respectively. Through ultra-low temperature enzymatic, the V-PE with the highest amino acid grafting ratio had the highest solution viscosity and gel hardness. Furthermore, the hydrogel has better thermal stability, which can maintain the three-dimensional network structure of the gel at higher temperatures without collapse. Amidated pectin with ultra-high viscosity and low gelation restriction can provide valuable information in applications such as food and medicine.
研究领域:
食品科学
·
生物化学
·
医药工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Juan Wang,Xiaoyu Wang,Yongzhao Yang,Qianlong Fu,Feng Hu,Zijian Zhang,Shuang Li
Silicon carbide (SiC) ceramic membranes are promising components for the efficient treatment of various wastewaters in membrane-based techniques. However, the high preparation temperature and then the high production cost inhibits their large-scale application. Here, an ultra-low temperature sintering process was proposed to prepare SiC ultrafiltration membrane. When the ceramic membrane was heated at 600 °C in air, a selective layer comprised of α-SiC and β-SiC formed without the emergence of crystalline silica. The thickness of the membrane layers was determined by the solid content and viscosity of the slurry. Well-dispersed SiC grains and homogeneous-distributed pores formed in the selective layers when using 100 nm SiC powders. The water flux and emulsion flux were investigated to verify the permeability of the ceramic membrane. Thus, this work proposes an energy-saving process for the preparation of SiC UF membrane and achieves the preparation of SiC UF membrane at ultra-low temperature.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Xiaofei Wang,Jinping Li,Cheng Yang,Hui Zhang,Songhe Meng
It is difficult to achieve densification for metastable ceramics at ultra-low temperatures sintering due to insufficient sintering kinetics. Here, one strategy is proposed to enhance ceramic densification based on the principles of grain refinement and interface modification, in conjunction with a cold sintering process (CSP, 190 °C, 1 − 240 min, and 350 MPa) to achieve ceramic fabrication in a solid-liquid coexistence sintering environment. ZrW 2 O 8 @ZrO 2 metastable composites as an example to demonstrate the effect of surfactant on grain tailoring and interfacial structure design during the hydrothermal assembly. The results show that the densities and mechanical strengths of the composite ceramics were significantly improved after the shape tailoring. Furthermore, the shape-tailored strawberry-like nanostructure enables the ZrW 2 O 8 to be split into smaller individual units, which allows the composites to achieve a high-level of zero thermal expansion ( α ‾ = 0.045 × 10 −6 °C −1 [-10 − 300 °C]). Such a methodology can effectively solve ceramic densification in ultra-low temperature sintering and provide a practical path for the fabrication of metastable ceramics.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）