ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Jia Chen,Zhilin Chen,Xianbo Hou,Liming Chen
Efficient thermal insulators that can maintain their efficacy at extreme temperatures are in pressing demand, particularly in fields such as energy saving, aerospace, and sophisticated equipment. Herein, a novel and facile polymerization-regulated optimal strategy is adapted to realize the comprehensive performance of polyimide (PI) aerogel membranes with mechanical robustness, high flexibility, hydrophobicity, light transmittance, and efficient thermal insulation. Benefiting from the hydrolysis of monomers and chemical imidization reaction process verified by a thermo-chemo-mechanically coupled theoretical model, the viscosity of precursors, shrinkage rate, and microstructure of aerogels are precisely controlled, leading to a low thermal conductivity range of 0.023–0.044 W/(m·K). The fabricated PI aerogel membranes, which undergo a remarkable transformation from their initial brittle and opaque nature to a state of high flexibility and transparency, exhibit a 3.0 times increase in tensile strength (4.6 MPa) and a 8.4 times improvement in elongation at break (20.6%) over previous studies while demonstrating an exceptional light transmittance of 92.5% across a wide spectral range from 500 to 2500 nm. Additionally, the PI aerogel membranes possess superior mechanical properties and a wide temperature resistance range extending from −196 to 300 °C. These flexible PI aerogel membranes can be effectively adjusted to meet the practical application of a circular ring solar thermal collector, which displayed a high solar heat collection temperature of 135 °C at a thickness of 0.5 mm. The coordination between the thermophysical properties and mechanical properties of the PI aerogel membranes in this work holds great promise for application requirements of thermal insulators in optical elements under harsh environments.
研究领域:
材料科学
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能源工程
·
航空航天工程
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产品关联
DOI
PubMed
高影响因子
Acta Metallurgica Sinica-English Letters
·
2024
·
IF 2.9
Zeng Yanwei,Xu Peng,Liu Guoqiang,Wang Tianguan,Lei Bing,Feng Zhiyuan,Zhang Ping,Meng Guozhe
Chloride-induced corrosion of steel reinforcement is the key factor leading to the degradation of reinforced concrete building durability. Improving the corrosion resistance of oxide scale of rebar has always been a research hotspot in the field of civil engineering materials. A ZIF-8 modified Ce–Sol–gel (ZCS) film was prepared on oxide scale of plain steel rebars by sol–gel method. It is observed that the | Z | 0.01 Hz value of the ZCS film reached 320 kΩ cm 2 , which is about 29 times higher than that of blank rebar in simulated concrete pore (SCP) solution with 0.1 M NaCl. Then, they were inserted into mortar block and curing them in a curing box at T = 20 ± 2 °C and RH = 95 ± 2% for 28 days. Subsequently, these samples were subject to electrochemical impedance spectroscopy in 3.5 wt% NaCl. The | Z | 0.01 Hz value of the rebar with the ZCS film was six times higher than that of the blank rebar after immersing for 20 days, resulting in an overall increase in corrosion resistance for rebar. The results indicated that the modification by ZIF-8 could reduce the porosity of Ce–sol–gel (CS) film and improved the “labyrinth effect” of the film. Additionally, the negative charge on the surface of ZIF-8 in alkaline condition increased the repulsion effect with Cl − , significantly reducing the sensitivity of rebar to Cl − .
研究领域:
土木工程材料
·
防腐蚀技术
✓ 已验证
产品关联
DOI
高影响因子
Journal of CO2 Utilization
·
2020
·
IF 5.993
Huan Wen,Lei Zhang,Yingjie Du,Ziyuan Wang,Yunhong Jiang,Hongjie Bian,Jiandong Cui,Shiru Jia
In this study, we synthesized for the first time a bimetal-based inorganic-carbonic anhydrase (CA) hybrid nanoflower to immobilize CA using Cu 2+ and Zn 2+ instead of single metal ion. Subsequently, the synthesized bimetallic hybrid nanoflowers (CANF) were embedded into the poly(vinyl alcohol) (PVA)-chitosan (CS) hydrogel networks to obtain PVA/CS@CANF hydrogel membrane. The CANF exhibited a significantly higher activity recovery of 70 % compared with 35 % with CA/Zn 3 (PO 4 ) 2 hybrid nanoflowers and 10 % with CA/Cu 3 (PO 4 ) 2 hybrid nanoflowers. The PVA/CS@CANF hydrogel membrane possessed excellent mechanical strength, high catalytic activity, and were easy to flow out without centrifugation or filtration. At the same time, the PVA/CS@CANF displayed higher thermostability, storage stability, and pH stability than free CA and CANF , and superior reusability and CO 2 capture capacity. The hydrogel membrane maintained more than 75 % of its original activity after 8 cycles. However, CANF only maintained 12 % of its original activity. Furthermore, the amount of CaCO 3 produced by PVA/CS@CANF membrane was 9.0-fold and 2.0-fold compared with free CA and CANF, respectively. Therefore, This approach to synthesizing bimetallic-based protein hybrid hydrogel membrane could have a bright future in CO 2 capture.
研究领域:
生物化学
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材料科学
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环境科学
✓ 已验证
DOI
高影响因子
DESALINATION
·
2025
·
IF 9.8
Yuhang Li,Bingbing Chen,Huiyan Gao,Qiuyue Hu,Xing Gao,Yuanlin Fu,Aoxiang Zhang,Tieqiang Wang,Jun Zhou,Yu Fu
The effective separation of dyes and desalination represents a critical challenge in treating high-salinity dye wastewater. Herein, we propose an ultra-thin bifunctional gel membrane fabricated via a gas-liquid interface-assisted soft spray technique. This method enables precise control over membrane thickness while preserving a nano-porous architecture, which synergistically enhances both permeability and selectivity. By incorporating graphene oxide (GO), the membrane exhibits exceptional photothermal properties, enabling efficient solar-driven evaporation of separated salt solutions. The proposed two-stage treatment strategy sequentially achieves dye/salt separation and desalination, ultimately yielding potable water. During filtration, the membrane demonstrates a high separation flux of 37.3 L·m −2 ·h −1 (0.1 MPa) with >99 % dye rejection, while maintaining low salt retention (<8 %), highlighting its potential for dye recovery from hypersaline wastewater. In the subsequent desalination phase, the gel-based evaporator achieves an evaporation rate of 1.76 kg·m −2 ·h −1 under one-sun irradiation (1 kW·m −2 ), coupled with excellent salt resistance. Notably, the membrane exhibits outstanding antibacterial performance and anti-fouling properties, maintaining stable operation over 50 cycles. This stepwise approach not only enables resource recovery but also enhances the sustainability of wastewater management through simultaneous dye reclamation and freshwater production.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 13
·2905
·
IF 5
Xiaozhi Ouyang,Cheng Huang,Sha Cheng,Pengchao Zhang,Wen Chen
Ultrathin hydrogel films composed of cross-linked polymer networks swollen by water, with soft and moisturized features similar to biological tissue, play a vital role in flexible biosensors and wearable electronics. However, achieving efficient and continuous fabrication of such films remains a challenge. Here, we present a microfluidic-based strategy for the continuous fabrication of free-standing ultrathin hydrogel films by using laminar flow, which can be precisely controlled in the micrometer scale. Compared with conventional methods, the microfluidic-based method shows advantages in producing hydrogel films with a high homogeneity as well as maintaining the structural integrity, without the need of supporting substrates and sophisticated equipment. This strategy allows the precise control over the thickness of the hydrogel films ranging from 15 ± 0.2 to 39 ± 0.5 μm, by adjusting the height of the microfluidic channels, with predictable opportunities for scaling up. Therefore, our strategy provides a facile route to produce advanced thin polymer films in a universal, steerable, and scalable manner and will promote the applications of thin polymer films in biosensors and wearable electronics.Keywords:microfluidic;laminar flow;ultrathin hydrogel film;continuous fabrication;controlled thickness
研究领域:
材料科学
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生物医学工程
·
微流控技术
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Ruiping Tong,Zhihui Ma,Rui Yao,Ping Gu,Tengfei Li,Linfeng Liu,Fazhan Guo,Mingshun Zeng,Junfei Xu
Flexible and stretchable substrates based on pure natural polymers have attracted widespread attention for next-generation “green” electronics. However, fabrication of stretchable and “green” electronic sensors with integrated high stretchability, optical transmittance and good conductivity still remains tremendous challenges. Herein, alginate ionic gel films (AIGFs) with integrated high stretchability (tensile strength of 4.13 MPa and 191.1 % fracture strain) and excellent transparent properties (transparency of ∼92 %) are achieved by the glycerol inducing physical crosslinking and CaCl 2 initiating ionic crosslinking, a simple soaking and drying strategy. The obtained gel films not only exhibit good ionic conductivity , but also high reliability, wide-range sensing, and multiple sensitivity to external stimulus. More importantly, these ionic conductive gel films as green substrates are successfully utilized for construction of flexible and patterned optoelectronic devices. This promising strategy will open up new powerful routes to construct highly stretchable, transparent, and ionic conductive substrates for multifunctional sensors and devices.
研究领域:
材料科学
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电子工程
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Shijie Hou,Zhiming Ha,Yangchen Yu,Kexin Li,Lei Lei,Yuzheng Xia,Xiaonong Chen,Bifa Fan,Shuxian Shi
Efficient heat dissipation is crucial for the performance and longevity of compact electronic devices, which face significant thermal management challenges. This study introduces a reusable and self-hygroscopic heat dissipation hydrogel using poly(vinyl alcohol) (PVA) and soluble acrylic resins (AR) as the matrix, lithium chloride (LiCl) as the hygroscopic component, and borax and aluminum ions (Al3+) as cross-linking agents. The dynamic covalent cross-linking and physical cross-linking provide enhanced recyclability and mechanical strength, allowing the hydrogel to maintain excellent performance through repeated heat dissipation cycles. The influence of Li+ concentration on the hydrogel’s hygroscopic properties was evaluated, revealing that at 10.0 mol/L Li+, nearly 100% of the water was reabsorbed within 6 h at 20.0 °C. The hydrogel demonstrated superior self-hygroscopic properties and maintained long-term functionality across multiple cycles. The hydrogel effectively reduced surface temperatures of heat sources by up to 20 °C compared with commercial heat fins. The reversible cross-linking mechanism enables the hydrogel to undergo bond breakage and reformation, facilitating recyclability and extending its practical lifespan. This innovative hydrogel presents a promising solution for advancing thermal management in electronic devices and contributes to global sustainable development.
研究领域:
材料科学
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热能工程
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2022
·
IF 4.326
Yongfang Chen,Liping Gan,Hanlin Zhang,Dongya Yang,Fengxian Qiu,Tao Zhang
Heat preservation, breathability, and unidirectional liquid penetration properties of wearable materials are vital for personal thermal management applications. Herein, flexible wearable Kevlar aerogel membranes with breathable and unidirectional liquid penetration properties were fabricated by underwater protection spraying of PDMS-trichlorotoluene onto one side of a Kevlar aerogel membrane and magnetron sputtering of Al nanoparticles on the other side of a Kevlar aerogel membrane PDMS (Al-KAM-PDMS). The results indicated that the PDMS side played an important role in improving the unidirectional liquid penetration property due to the asymmetric wettability property and an aerogel structure. To simulate unidirectional liquid penetration, simulated sweat can be penetrated from the PDMS side to the Al side of Al-KAM-PDMS within 14.4 s, implying excellent permeability. The Al side with high infrared reflectivity (72.77%) demonstrates that infrared radiation can be reflected back to the human body to achieve passive heating. An infrared image shows that Al-KAM-PDMS enables a simulated skin temperature decrease of 5 °C under a low temperature environment as compared to the Kevlar aerogel. The introduction of PDMS into Al-KAM-PDMS endows the membrane with high tensile stress of 5.60 MPa. In addition, Al-KAM-PDMS also possesses excellent breathability, showing its potential in wearable materials. Because of the exceptional unidirectional liquid penetration, breathability, and radiant heat insulation ability, Al-KAM-PDMS is a promising wearable material to help maintain a comfortable microclimate for individuals in outdoor environments.
研究领域:
材料科学
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热能工程
·
纺织科学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2024
·Vol. 18
·期 7
·1-14
·
IF 6.1
He Qian,Gao Junkai,Chen Zhongzhi,Ding Yuanjing,Xia Mengsheng,Xu Pengtao,Chen Yan
To avoid resource wastage and secondary environmental pollution, recycling and reusing waste wood powder is still a great challenge. Moreover, the poor viscosity and irregular pore size of wood powder limit its practical application. This study employed a green and convenient wood powder reconstitution strategy to achieve highly adhesive bonding and pore size control between wood powder particles, thus preparing a high-strength and super hydrophilic wood powder membrane. The wood powder fibers were partially dissolved and regenerated to create a reconstituted wood powder hydrogel membrane, using waste wood powder as the raw material. The wood powder reconstitution strategy offers advantages such as environmental friendliness, simplicity, cost-effectiveness, and strong universality. Furthermore, the materials exhibit excellent self-cleaning properties and superhydrophilicity. Driven by gravity, the membrane can purify oily wastewater and dyes. Additionally, the reconstitution strategy offers a new pathway for recycling wood powder.
研究领域:
材料科学
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环境科学
·
绿色化学
✓ 已验证
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Zhenjie Ma,Xiangshang Chen,Gaoyang Zhou,Yue Jia,Huayan Chen,Xiaolong Lu
A stability-enhanced extraction gel membrane (EGM) with a thin functional layer of carrier for metal ion recovery was prepared and improved by cross-linking technology. Hydroxyl-terminated polybutadiene (HTPB) was used as the coupling agent to form a cross-linked network skeleton. Polymethylhydrosiloxane (PMHS) and HTPB were hydrosilylated to form a compact cross-linked structure. In addition, the D2EHPA (carrier) was fixed on polymer cross-linked structure. The prepared stability-enhanced EGM was characterized by SEM, EDS, ATR-IR, XPS . The influence of preparation parameters was studied and compared systematically. The optimum preparation conditions obtained from the data indicate that the total polymer concentration is 8 wt%, the mass ratio of HTPB/PMHS is 1:2, and the mass ratio of TEOS/VTES is 1:1. After 72 h of stability experiments, the mass transfer flux decreased from 2065.46 mg m −2 h −1 –1718.82 mg m −2 h −1 , the overall flux attenuation rate is only 16.8 %, which is 50.8 % lower than that of EGM without surface enhancing layer. In comparison, the flux attenuation rate of the traditional supported liquid membrane (SLM) even reached 100 % after 66 h. Therefore, the stability-enhanced EGM prepared in this study presents obviously higher operating stability compared with the EGMs operated at same conditions. The results suggest a potential approach for metal ions removal from water with high efficiency and stability.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Ye Tian,Xiaoshuang Wei,Zhi Jian Wang,Pengju Pan,Fangyuan Li,Daishun Ling,Zi Liang Wu,Qiang Zheng
We report a facile approach to prepare ultrathin physical hydrogel films based on the Marangoni effect, which drives an ethanol solution of poly(stearyl acrylate-co-acrylic acid) (P(SA-co-AAc)) to rapidly spread on the water surface. The subsequent solvent exchange leads to sol–gel transition, where the long alkyl chains of SA units segregate to form physical cross-linking junctions. The resultant disk-shaped single-network (SN) gel films are uniform with tunable thickness (40–80 μm) and diameter (5–12 cm) and possess robust mechanical properties with tensile breaking stress, σb, and breaking strain, εb, being 0.3–1.1 MPa and 30–290%, respectively. The mechanical properties of SN gel films can be further improved by introducing ductile poly(N-isopropylacrylamide) (PNIPAm) into the preformed gel matrix, which forms strong hydrogen bonds with the first network. The obtained physical double-network (DN) hydrogel films are transparent and show excellent mechanical performances with σb of 3–5 MPa and εb of 100–500%. Due to the ultrathin thickness of gel films and response of PNIPAm to saline solutions, the tough DN gel films exhibit fast response (≤60 s) and large stroke force (0.5 MPa) after switching the environment from water bath to saline solution, making them an ideal material to design artificial muscles, soft actuators, and chemomechanical devices.
研究领域:
材料科学
·
生物工程
·
软体机器人
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2021
·
IF 4.089
Hao Zhang,Yuenan Zhang,Ling Fu,Ozioma Udochukwu Akakuru,Zongbao Wang,Aiguo Wu,Yujie Zhang
Water pollution has been increasingly becoming a serious environmental and health challenge in recent years. This is compounded by the often coexisting oil pollution and heavy metal pollution. It is of great practical significance to develop materials that can simultaneously deal with these two kinds of water pollution problems. In this study, a simple and green approach is proposed for preparing matrix-free citric acid modified alginate-based aerogel membrane by simple sol spraying, chemical cross-linking, and freeze-drying methods. The aerogel membrane with dense upper and lower surfaces and a loose interlayer possesses the properties of superhydrophilicity and underwater superoleophobic and strong antiadhesion performances, and it can realize the separation of highly viscous miscible oil–water emulsions with a separation efficiency of over 99.5%, even in corrosive and high-salt environments. The membrane has shown strong stability during 3000 min of uninterrupted cross-flow filtration of emulsion, which reflects the good long-term separation performance of the membrane. The prepared membrane can also be used for the removal of various heavy metal ions from water under gravity, with a removal efficiency >99% and an adsorption capacity of about 240 mg/g for Pb2+. The modified membrane which features low cost, a simple and green preparation process, excellent oil–water separation, and heavy metal removal capabilities possesses great application potential in the treatment of polluted water.
研究领域:
环境科学
·
材料科学
✓ 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）