CEMENT AND CONCRETE RESEARCH
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2025
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IF 13.1
Haochuan Wang,Xin Liu,Chong Wang,Wei Wang,Jinxiang Hong,Pan Feng
Ultra-early mechanical properties are critical for shotcrete performance, significantly influenced by ettringite and calcium silicate hydrate (C-S-H) formed during the initial hydration stage and free water. This study investigates the individual and synergistic effects of these phases on mechanical behavior using equivalent cement pastes. In this system, cement was entirely replaced with dolomite particles of matching size distribution, with the controlled introduction of free water, ettringite, and C-S-H. The validity of these equivalent systems was confirmed through comprehensive characterization. Mechanical performance was subsequently evaluated using compression, shear, Vickers hardness and nanoindentation tests. Results revealed that free water remarkably weakened the mechanical properties, whereas both ettringite and C-S-H enhanced strength by reducing voids and reinforcing weak particle interfaces. Ettringite primarily contributed to interparticle friction, while C-S-H enhanced cohesion at interfaces including dolomite-dolomite, dolomite-ettringite and ettringite-ettringite contacts. When co-existing, C-S-H formed within the porous ettringite network, not only establishing a multi-scale filling structure but also stabilizing the dolomite-ettringite skeleton. These findings advance our understanding of the early-age mechanical development of shotcrete and highlight the potential of equivalent cement systems as robust tools for research into cementitious materials.
研究领域:
土木工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Biomaterials Science
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2024
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IF 5.8
Hui Zhi,Yingxi Qin,Yang Li,Fengya Wang,Liang Feng
As water-saturated polymer networks, the easy water loss of hydrogels directly affects their end-use applications. Minimizing the ratio of free water and increasing the ratio of bound water in the gel system has become key to extending the service life. In this work, an ionogel is prepared that effectively regulates the proportion of free water and bound water through the formation of wrinkle angles by the hydrophilic and hydrophobic chains in the gel system and the non-volatile nature of the ionic liquid. Acrylamide and N-acryloyl phenylalanine are used as free radical comonomers, and phenol red is used as an acid–base indicator. The ionic liquid is used as a dispersant to stabilize the whole framework. Due to the hydrogen bonding interactions, electrostatic interactions, and ion–ion interactions, the ionogel exhibits good stretchability, adhesion, pH sensitivity, and stability. The ionogel can be stretched in multiple directions without cracking and can be bent 180° after being left in air for 45 days. Assembling the ionogel into a wearable device can effectively monitor the pH value of sweat during exercise. The detection results are displayed in the form of RGB values, providing a preliminary diagnosis of the health of the human body.
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
Energy Storage Materials
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2024
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IF 18.9
Qiaoyi Yan,Zhengqiang Hu,Zhengzheng Liu,Feng Wu,Yi Zhao,Renjie Chen,Li Li
The uneven deposition of zinc and hydrogen generation at the zinc anode interface constitute major impediments to the lifespan of aqueous zinc-ion batteries. Herein, an amphoteric ion additive, choline phosphate (CP), is proposed to stabilize the battery anode interface. The remarkable interplay between choline ions and phosphate groups assumes a pivotal role in homogenizing zinc ion deposition and regulating the behavior of free water molecules. Due to the negative electric field adsorption on the surface of the zinc anode, the positively charged choline ions will be adsorbed on its surface preferentially and prevent the approach of water molecules. The phosphate group interacts strongly with the zinc ion, permeating the solvated structure of these ions, regulating zinc ion flux, and immobilizing free water molecules through hydrogen bonding to impede unwanted side reactions. In summary, using CP additives yields a profound enhancement in enabling significantly extended cycle lifespans of both Zn//Zn symmetric batteries and LiFePO 4 full batteries.
研究领域:
电化学
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能源材料
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电极界面工程
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储能技术
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电池化学
✓ 已验证
DOI
高影响因子
ACS Nano
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2024
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IF 15.8
Chuan Li,Xiaohong Zhu,Donghong Wang,Shuo Yang,Rong Zhang,Pei Li,Jun Fan,Hongfei Li,Chunyi Zhi
Hydrogels are widely used as quasi-solid-state electrolytes in aqueous batteries. However, they are not applicable in high-voltage batteries because the hydrogen evolution reaction cannot be effectively suppressed even when water is incorporated into the polymer network. Herein, by profoundly investigating the states of water molecules in hydrogels, we designed supramolecular hydrogel electrolytes featuring much more nonfreezable bound water and much less free water than that found in conventional hydrogels. Specifically, two strategies are developed to achieve this goal. One strategy is adopting monomers with a variety of hydrophilic groups to enhance the hydrophilicity of polymer chains. The other strategy is incorporating zwitterionic polymers or polymers with counterions as superhydrophilic units. In particular, the nonfreezable bound water content increased from 0.129 in the conventional hydrogel to >0.4 mg mg–1 in the fabricated hydrogels, while the free water content decreased from 1.232 to ∼0.15 mg mg–1. As a result, a wide electrochemical stability window of up to 3.25 V was obtained with the fabricated hydrogels with low concentrations of incorporated salts and enhanced hydrophilic groups or superhydrophilic groups. The ionic conductivities achieved with our developed hydrogel electrolytes were much higher than those in the conventional highly concentrated salt electrolytes, and their cost is also much lower. The designed supramolecular hydrogel electrolytes endowed an aqueous K-ion battery (AKIB) system with a high voltage plateau of 1.9 V and contributed to steady cycling of the AKIB for over 3000 cycles. The developed supramolecular hydrogel electrolytes are also applicable to other batteries, such as aqueous lithium-ion batteries, hybrid sodium-ion batteries, and multivalent-ion aqueous batteries, and can achieve high voltage output.
研究领域:
材料科学
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电化学
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能源存储
✓ 已验证
DOI
高影响因子
Journal of Future Foods
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2025
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IF 7.2
Yang Lin,Qiaolian Xu,Yanqing Mao,Ping Shao,Xiangmin Li
This study investigated the synergistic effect of Tremella polysaccharides (TFPS) and sodium caseinate (SC) at different ratios on water distribution in emulsions. The stability and rheological properties of the emulsion were analyzed and compared to a control group without TFPS. Results indicated that the TFPS-SC emulsion had a smaller particle size (132.6-452.47 μm), with a maximum emulsification activity index of 36.08 m 2 /g at 1:1 ratio of TFPS to SC. Additionally, the TFPS-SC emulsion at a ratio of 2:1 exhibited the highest zeta potential of -39.4 mV and the highest emulsification stability index of 65.31 min. The interaction between TFPS and SC in aqueous solutions was characterized by using turbidity measurements, confocal laser scanning microscopy, surface hydrophobicity, and spectroscopy. The molecular forces involved in the interaction between TFPS and SC were also examined. Low field nuclear magnetic resonance and magnetic resonance imaging studies have demonstrated that TFPS/SC can enhance the water holding capacity of emulsions, increase the accumulation of bound water, reduce the release of free water, and maintain a relatively high hydrogen proton density to retain water. TFPS-SC strongly bind to lipids, which could inhibit oil digestion and decomposition, showing the potential to be a feasible alternative to fat. These findings are significant for the regulation of TFPS and SC in food applications, especially fat replacement in foods.
研究领域:
食品科学
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食品化学
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胶体科学
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营养学
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生物大分子相互作用
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）