ENERGY & FUELS
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2025
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IF 5.3
Minghang Mao,Kefeng Yan,Chang Chen,Xiaosen Li,Zhaoyang Chen,Gang Li,Yi Wang
As a new type of clean energy, the exploitation of natural gas hydrate resources is key in global energy development of the future. A fundamental understanding of the heat transfer characteristics of natural gas hydrate reservoirs is critical for effective natural gas hydrate exploitation. In this work, the heat transfer characteristics of the sediments on marine natural gas hydrate reservoirs were investigated by using experiments and machine learning algorithms. The thermal conductivities of natural marine sediments from the marine natural gas hydrate reservoir and their primary porous media (quartz sand, Illite, and montmorillonite) were measured. The effects of the porous media component, the water content, the salt concentration, and the phase state change on the thermal conductivity of the reservoir were discussed. The experimental results show that the thermal conductivity of the reservoir depends not only on the inherent thermal conductivity of the porous media but also on the heat transfer mode between the components. The effective thermal conductivity of the porous media system is proportional to the water content and inversely proportional to the salt concentration in porous media. The swelling characteristics of porous media affect the heat transfer mode of the system, thus affecting the extent of change in the effective thermal conductivity with variations in the water content and salt concentration. During the phase transition process, the swelling characteristics of the porous media slow down the heat transfer process, an effect that can be mitigated by the swelling inhibition caused by salt. Additionally, the performances of six machine learning algorithms were evaluated using four evaluation indicators. Results show that the gradient boosted decision trees (GBDT) can yield good predicted values of the thermal conductivity of porous media in a marine natural gas hydrate. A feature importance analysis further reveals that the salt concentration and porous media components are the essential factors influencing the thermal conductivity of marine gas hydrate reservoirs.
研究领域:
能源地质学
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机器学习应用
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2019
·
IF 6.361
Huaxiu Xu,Yun Tan,Wenhui Rao,Di Wang,Shimei Xu,Wang Liao,Yu-Zhong Wang
Hydrogels are known as soft and wet materials. Development of metal-like hydrogels with super strong and malleable properties is highly desirable as it allows for broader application and reprocessability. Here we report a dual nanocomposite hydrogel with peculiar mechanical properties in water-poor region. The gel with water content of 35% exhibits excellent recovery and fatigue resistance with elongation at break exceeding 800%, while the gel with 15 wt% of water content shows an ultra-high compressive strength and modulus of more than 1 GPa. The dual nanocomposite structure and bound water endowed the gel with high strength. Besides, the gel modulus can be easily switched by temperature change in a reversible way due to hybrid crosslinking network of the hydrogel in which physical network breaks and reforms rapidly while chemical network remains the gel state. So the gel shows a force-driven softening behavior and can be molded into different shapes due to reversible thermo-induced modulus decline. The softening behavior is also beneficial for the self-healing of the gel. The peculiar mechanical properties make the hydrogel a potential candidate for a new generation of advanced engineering materials .
研究领域:
材料科学
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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
Materials Research Express
·
2024
·Vol. 11
·期 11
·115308
·
IF 1.8
Yang Gao,Huanjun La,Haonan Min,Zhenzhong Hou
Hydrogels have demonstrated significant potential in wound dressings, owing to their adjustable water content, excellent biocompatibility, and other advantages. An ideal wound dressing requires absorbing exudate while maintaining mechanical properties to prevent secondary damage to the wound under external pressure. In this study, Polyacrylic Acid (PAA)/Chitosan (CS) double network hydrogels were prepared via radical polymerization, and the swelling ratio, compressive modulus, and other parameters were experimentally measured. A hyperelastic finite element model of the hydrogel was then established, and its rationality was validated by experiments. Based on the model, the impacts of CS content and dynamic water content on the compressive properties of PAA/CS hydrogels were analyzed. Tetracycline hydrochloride was loaded into PAA/CS hydrogels, the drug release performance and adhesion experiments were carried out. The results indicated that, compared with the hydrogels with 2.5% and 5% CS content, the hydrogel with 1% CS content had the highest swelling ratio, which was 1774%. Meanwhile, its equilibrium water content could attain 94.6%. When the water content varied within the range from 45% to 75%, the compressive strength of the hydrogel with 5% CS content ranged from 0.33 MPa to 1.22 MPa, similar to that of skin tissue. Additionally, the prepared drug-loaded PAA/CS hydrogels exhibited a drug release pattern approximately following the Korsmeyer-Peppas model within 7 days. They also exhibited remarkable adhesion to porcine skin and different substrate surfaces. This study provides a basis for the clinical application of PAA/CS double network hydrogels as wound dressings in the repair of infected wounds.
研究领域:
生物材料学
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医学工程
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产品关联
DOI
高影响因子
STAR Protocols
·
2025
·
IF 1.3
Zihang Shen,Zheyu Dong,Jiabao Bai,Daochen Yin,Zhi Sheng,Yijie Cai,Zheng Jia
Summary Hydrogels are prone to dehydration over prolonged use, leading to changes in their properties. Inspired by the human skin’s stratum corneum, we present a protocol for the fabrication and application of a low-water-content polyelectrolyte hydrogel (L-hydrogel) that maintains mechanical and electrical properties over time. We describe steps for preparing a hygroscopic monomer through an ionic exchange reaction and a low-water-content hydrogel by UV crosslinking reaction and testing the material behaviors of L-hydrogel. We then detail procedures for preparing and testing L-hydrogel-based devices. For complete details on the use and execution of this protocol, please refer to Shen et al. 1
研究领域:
材料科学
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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
Extreme Mechanics Letters
·
2025
·
IF 4.5
Jingping Wu,Zhengjin Wang,Xiao Liu,Yong Zheng,Yang Gao,Jian Hu
Hydrogels with high water content and toughness are essential to various applications in smart materials and biomimetic systems. However, there exists a conflict between water content and toughness. To enhance toughness, high polymer chain density or water-free reinforcements are usually introduced into hydrogel matrices, which inevitably lead to a reduction in water content. In this study, we present a facile method for preparing water-abundant and tough hydrogels through ion transfer printing. By utilizing sodium alginate/polyacrylamide (Alg/PAAm) hydrogels as a flexible matrix and Fe 3+ ions as stiffening agents, we selectively introduce Fe 3+ ions into predefined regions of the hydrogel matrix, resulting in well-structured composite hydrogels comprising soft Alg/PAAm matrix and hard Fe 3+ -crosslinked Alg/PAAm (Fe-Alg/PAAm) fibers. As both the matrix and fibers are stretchable and water-abundant, the composites exhibit impressive stretchability ( ε ∼1000 %) and water content ( p ∼95 %). Notably, the alternating arrangement of the soft and hard fiber/matrix architecture effectively prevents crack propagation during loading by inducing stress deconcentration at the crack tip, thereby leading to exceptional toughness ( Γ ∼22000 J/m 2 ). This simple method introduces a universal design strategy for constructing stretchable, water-abundant, and tough hydrogels, considering that ionic crosslinking with multi-valent cation crosslinkers is widely used in hydrogels. Beyond the Fe 3+ and Alg/PAAm hydrogel system discussed here, this concept can be extended to various combinations of multi-valent ions and hydrogel networks containing opposite charges.
研究领域:
材料科学
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生物材料
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智能材料
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Ruidong Cheng,Xuehui Zhang,Jie Li,Hua Zheng,Qiuyu Zhang
Most natural supporting tissues possess both exceptional mechanical strength, a significant amount of water, and the anisotropic structure, as well as nanoscale assembly. These properties are essential for biological processes, but have been challenging to emulate in synthetic materials. In an effort to achieve simultaneous improvement of these trade-off features, a hydrogen bonding-induced self-assembly strategy was introduced to create nanoporous plastic-like polymer hydrogels. Multiple hydrogen bonding-mediated networks and nanoporous orientation structures endow transparent hydrogels with remarkable mechanical robustness. They exhibit Young’s modulus of up to 223.7 MPa and a breaking strength of up to 10.3 MPa, which are superior to those of most common polymer hydrogels. The uniform porous nanostructures of hydrogen-bonded hydrogels contribute to a significantly larger specific surface area compared to conventional hydrogels. This allows for the retention of high mechanical properties in environments with a high water content of 70 wt %. A rubbery stage is observed during the heating process, which can reverse and reshape the manufacture of objects with various desired 2D or 3D shapes using techniques such as origami and kirigami. Finally, as a proof-of-concept, the outstanding mechanical properties of poly(MAA-co-AA-co-NVCL) hydrogel, combined with its high water content, make it suitable for applications such as smart temperature monitors, multilevel information anticounterfeiting, and artificial muscles.
研究领域:
材料科学
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生物材料
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化学工程
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DOI
PubMed
高影响因子
ACS Sustainable Chemistry & Engineering
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2022
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IF 9.224
Yu-Xiong Ju,Run-Ze Hu,Ping-Yue Wang,Yu-Shi Shen,Fei-Fan Shuang,Jun Wang,Peng Song,Wei-Guo Zhao,Xiao-Hui Yao,Dong-Yang Zhang,Tao Chen
Poly(vinyl alcohol) (PVA) is a safe high-molecular polymer with good biocompatibility that can be prepared into hydrogels with high tensile strength by salting out. However, inorganic ions will cause PVA chains to form strong crystals through intramolecular H-bond interactions, resulting in dehydration of PVA chains and greatly reducing the water content of hydrogels. Herein, inspired by the structural model of straw rammed earth bricks, a PVA, silk nanofiber (SNF), and chitosan (CS) composite hydrogel (PSC) were prepared with a high Young’s modulus (8.85 ± 0.24 MPa), acceptable tensile strength (4 ± 0.28 MPa), and high fatigue threshold (8.09 ± 0.5 kJ/m2). Because SNF plays the role of straw-formed hydrogen bonds (H-bonds) with PVA and CS, the formation of H-bonds between PVA chains was inhibited, leading to more free hydrophilic groups (−OH). Therefore, the water content increased significantly to as high as 87%. By fabricating the structure of straw rammed earth bricks in hydrogels, PSC had both a high Young’s modulus and a high water content, even though the crystallinity of PVA decreased. PSC also showed antibacterial properties against Escherichia coli and Staphylococcus aureus due to CS and are expected to be further applied in biomedicine and tissue engineering.
研究领域:
生物材料学
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组织工程学
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产品关联
DOI
高影响因子
SCIENTIA HORTICULTURAE
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2024
·
IF 3.9
Xien Zhou,Zehong Chen,Zhenlin Wang,Daozong Sun,Lihong Yang,Guoqi Yan,Shuran Song
Most pesticide spraying studies focus on increasing droplet deposition on target surfaces, with little consideration of post-deposition pesticide droplet absorption mechanisms. The pesticide droplet absorption efficiency of leaves is related to environmental factors and plant growth status during pesticide application. In field environments, irrigation-based soil moisture content regulation is a key plant growth status adjustment method. A theoretical pesticide droplet leaf absorption model was established to study the effects of soil moisture content on droplet absorption. Controlled environment experiments were carried out to investigate the absorption of pesticide droplets, and a chi-square test was used to verify the model reliability. The results showed that pesticide droplet leaf absorption flux first increased and then decreased with increasing soil water content. The diurnal leaf water potential and stomatal conductance variationsindicated a memory effect, resulting in diurnal variationsin the pesticide droplet leaf absorption flux. Under the same soil water conditions, the absorption flux first increased and then decreased from 8 am to 6 pm (Beijing Time). Effective application of pesticides can be significantly enhanced by controlling soil moisture content and selecting the appropriate spraying time. The best spraying combination improved the application effectiveness nearly threefold overthat of the worst combination. The results are crucial for rational pesticide use, crop spraying optimization, and water savings.
研究领域:
植物生理学
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农业科学
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DOI
高影响因子
Energies
·
2021
·Vol. 14
·期 15
·4520
·
IF 3.004
Xiaokang Yang,Jiaqi Sun,Guang Jiang,Shucheng Sun,Zhigang Shao,Hongmei Yu,Fangwei Duan,Yingxuan Yang
Membrane water content is of vital importance to the freezing durability of proton exchange membrane fuel cells (PEMFCs). Excessive water freezing could cause irreversible degradation to the cell components and deteriorate the cell performance and lifetime. However, there are few studies on the critical membrane water content, a threshold beyond which freezing damage occurs, for cold storage of PEMFCs. In this work, we first proposed a method for measuring membrane water content using membrane resistance extracted from measured high frequency resistance (HFR) based on the finding that the non-membrane resistance part of the measured HFR is constant within the range of membrane water content of 2.98 to 14.0. Then, freeze/thaw cycles were performed from −50 °C to 30 °C with well controlled membrane water content. After 30 cycles, cells with a membrane water content of 8.2 and 7.7 exhibited no performance degradation, while those higher than 8.2 showed significant performance decay. Electrochemical tests revealed that electrochemical surface area (ECSA) reduction and charge transfer resistance increase are the main reasons for the degradation. These results indicate that the critical membrane water content for successful cold storage at −50 °C is 8.2.Keywords:freezing durability;cold start;membrane water content;performance degradation;proton exchange membrane fuel cell
研究领域:
能源科学
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材料科学
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Zihao Guo,Chenyi Shao,Yitian Su,Lan Chen,Qiaoling Kang,Xianhe Meng,Chengbin Jin,Tingli Ma,Meiqiang Fan,Dongliang Peng,Lijing Yan
Hydrogel electrolytes have distinguished themselves in aqueous zinc metal batteries due to their strong designability and diverse functions, especially in inducing even zinc deposition and inhibiting side reactions. While the high water content of hydrogel electrolytes can enhance Zn2+ ionic conductivity, it also tends to exacerbate undesirable water-related side reactions; thus, how to realize fast zinc ion transport kinetics under low water content remains a challenge. This work introduces carboxylated cellulose nanofibers with ample and diversified polar functional groups into cross-linking polyacrylamide networks to form hydrogel electrolytes. The strong hydrophilic groups of cellulose nanofibers, including carboxyl, hydroxyl, and inter/intramolecular ether bonds, not only grasp water molecules to facilitate desolvation of [Zn(H2O)6]2+ but also disperse the single-site binding energy to Zn2+ through multiple adjacent O atoms, effectively reconciling the conflicting demands of high Zn2+ ionic conductivity and low water content. Beyond their favorable mechanical properties, the as-prepared hydrogel electrolytes can induce flat grain-stacking zinc deposition, mitigate side reactions, and suppress polyiodide shuttling. Consequently, symmetric/asymmetric batteries and aqueous zinc–iodine batteries demonstrate much improved electrochemical performance. This work provides a reference for intricately designing hydrogel electrolytes for aqueous zinc metal batteries with specific functions by screening molecular structures of the components.
研究领域:
材料科学
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电化学
·
能源存储
✓ 已验证
DOI
高影响因子
Soft Matter
·
2023
·Vol. 19
·期 20
·3700-3710
·
IF 3.4
Xiangnan He,Jianxiang Cheng,Zechu Sun,Haitao Ye,Qingjiang Liu,Biao Zhang,Qi Ge
Digital light processing (DLP)-based three-dimensional (3D) printing is an ideal tool to manufacture hydrogel structures in complex 3D forms. Using DLP to print hydrogel structures with high resolution requires the addition of water-soluble photo-absorbers to absorb excess light and confine photopolymerization to the desired area. However, the current photo-absorbers for hydrogel printing are neither efficient to absorb the excess light nor water-soluble. Herein, we report a volatile microemulsion template method that converts a wide range of commercial non-water-soluble photo-absorbers including Sudan orange G, quercetin, and many others to water-soluble nanoparticles with solubility above 1.0 g mL−1. After using these water-soluble photo-absorber nanoparticles, the highest lateral and vertical resolutions of printing high-water-content (70–80 wt%) hydrogels can be improved to 5 μm and 20 μm, respectively. Moreover, the quercetin nanoparticle can be easily washed out so that we achieve colorless and transparent printed hydrogel structures with excellent mechanical deformability and biocompatibility as well as thermally controllable variations on transparency and actuation. The proposed methods pave a new efficient way to develop water-soluble photo-absorbers, which helps to greatly improve the printing resolution of the high-water-content hydrogel structure and would be beneficial to extend the application scope of hydrogels.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jiexin Zou,Henghui Huang,Shahid Zaman,Keguang Yao,Shuang Xing,Ming Chen,Haijiang Wang,Min Wang
Stored hydrogen has become increasingly important as an efficient and clean energy source. Noiseless and highly efficient electrochemical hydrogen compressors (EHCs) have been employed in H 2 fueling stations, refrigeration, and hydrogen purification. However, unequal water distribution in EHCs during operation significantly affects the compression performance. Herein, we developed a gradient hybrid membrane (PFSA/PCTS-5 + 2.5 + 1 %) for use in EHCs by synthesizing phosphorylated chitosan (PCTS) using chitosan, 2-phosphonate butane-1, 2, 4-tricarboxylic acid, and other water-retaining components. Advanced physical characterizations were employed to analyze the morphology, chemical structure, proton conductivity, water uptake ratio, hydrophilicity, thermal stability, and mechanical properties of the membranes. Furthermore, the membrane electrode assemblies (MEAs) fabricated with PFSA/PCTS hybrid membranes exhibited significant performance enhancement at a 50 % RH. The PFSA/PCTS-5 + 2.5 + 1 %-based MEA yields an EHC that can compress H 2 up to 0.9 MPa in 419 s (at 50 % RH) and up to 1.0 MPa in 137 s (at 100 % RH) in compression testing. EIS analysis reveals that the ohmic resistance decreased markedly due to gradient hybrid structure of membrane. Such a remarkable performance is attributed to the gradient structure, high hydrophilicity of the functional groups (–OH, –NH 2 ), and good proton conductivity arising from the synergetic effect of phosphate groups and carboxyl groups .
研究领域:
能源材料科学
·
电化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）