CEMENT & CONCRETE COMPOSITES
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2024
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IF 10.8
Han Wang,Liguo Wang,Junlin Lin,Yali Li,Zeyu Lu,Jinyang Jiang
The random distribution of pozzolanic materials (PM) using direct mixing strategy reduces their contact possibility with hydration-released calcium hydroxide (CH), and limits the corresponding reinforcing efficiency to cement-based materials via pozzolanic reaction. In this study, a target dispersion strategy of PM nearby CH was proposed using super absorbent polymers (SAPs) as the carrier. On the one hand, nano silica (NS) and calcined clay (CC), two typical PM, can be encapsulated into SAPs through the hydrogen bonding interaction; on the other hand, the region around SAPs was enriched with more water and higher Ca 2+ concentration, which triggered the in situ crystallization of CH. In this case, the contact possibility between the NS or CC (NS/CC) and hydration-released CH was improved by the target dispersion strategy, and resulted in a 60 %–253 % increase in pozzolanic reaction degree (PRD) of NS/CC. Furthermore, the reinforcing effect of NS/CC on compressive strength of cement paste was enhanced by 25 % through this strategy. Therefore, the current study introduces a novel method for increasing the pozzolanic reinforcing efficiency of cement-based materials by turning the random to target dispersion of PM nearby CH.
研究领域:
土木工程
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材料科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2024
·Vol. 26
·期 1
·62
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IF 4.9
Yuankun Wang,Chongli Wang,Weidong Lin,Qin Wang,Baisong Li,Cheng Chen,Ye Yuan,Francis Verpoort
α-Hydroxy ketones are a crucial class of organic compounds prevalent in natural products and pharmaceutical molecules. The CO2-promoted hydration of propargylic alcohols is an efficient method for the synthesis of α-hydroxy ketones. Herein, an ionic liquid (IL) was designed to catalyze this reaction individually under atmospheric CO2pressure, volatile organic solvents, and additives. This IL, constructed from the molybdate anion, can be recycled from industrial (NH4)2MoO4production wastewater, demonstrating its high tolerance to catalytic environments and significant potential for practical applications. To our knowledge, this is the first instance of an oxometallate-based IL catalyst being utilized for the CO2-promoted hydration of propargylic alcohols. Further mechanistic studies revealed the bifunctionality of this IL in activating both CO2and substrates.
研究领域:
有机化学
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催化化学
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绿色化学
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DOI
PubMed
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 7
·1456
·
IF 4.2
Kaihe Lv,Haokun Shen,Jinsheng Sun,Xianbin Huang,Hongyan Du
Shale hydration dispersion and swelling are primary causes of wellbore instability in oil and gas reservoir exploration. In this study, inulin, a fructo-oligosaccharide extracted from Jerusalem artichoke roots, was modified by acylation with three acyl chlorides, and the products (C10-, C12-, and C14-inulin) were investigated for their use as novel shale hydration inhibitors. The inhibition properties were evaluated through the shale cuttings hot-rolling dispersion test, the sodium-based bentonite hydration test, and capillary suction. The three acylated inulins exhibited superb hydration-inhibiting performance at low concentrations, compared to the commonly used inhibitors of KCl and poly (ester amine). An inhibition mechanism was proposed based on surface tension measurements, contact angle measurements, Fourier-transform infrared analysis, and scanning electron microscopy. The acylated inulin reduced the water surface tension significantly, thus, retarding the invasion of water into the shale formation. Then, the acylated inulin was adsorbed onto the shale surface by hydrogen bonding to form a compact, sealed, hydrophobic membrane. Furthermore, the acylated inulins are non-toxic and biodegradable, which meet the increasingly stringent environmental regulations in this field. This method might provide a new avenue for developing high-performance and ecofriendly shale hydration inhibitors.
研究领域:
石油工程
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材料科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·Vol. 34
·期 33
·2401732
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IF 18.5
Xiaoyun Xu,Zhuang Wang,Yupei Su,Ke Zhang,Min Li,Qi Zhang,Shuai Zhang,Yi Zhao,Qinfei Ke,Hong Hu,Robert J. Young,Shanshan Zhu,Jinlian Hu
Hydration-induced shape-morphing behavior has been discovered in many natural fiber-based materials, yet this smart behavior in regenerated fibers from biopolymers lacks investigation. Here, hierarchically structured silk fibers are developed with anisotropic long-range molecular organization and water-responsive effects resembling natural spider silk. The regenerated silk fibers exhibit the water-triggered shape-memory effect and a water-driven cyclic response. The reversible hydrogen bonds and transformation in the metastable secondary structure from α-helices/random coils to β-sheets are explored as the mechanisms responsible for the water-responsiveness. The silk fibers obtained possess a tensile strength higher than 104 MPa at a fracture strain of ≈100%, showing noticeable toughness. The water-responsive silk fibers exhibit a shape recovery rate of ∼83% and generate a maximum actuation stress of up to 18 MPa during the water-driven cyclic contraction that outperforms most traditional natural textile fibers. The regenerated silk fibers show potential for use in water-driven actuators, artificial muscle, and smart fabrics based on the integration of suitable mechanical properties and water responsiveness.
研究领域:
材料科学
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生物医学工程
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纺织科学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Pei Ren,Meiqi Han,Xingan Wang,Mu Zhang,Xudong Sun
Y 2 O 3 and CaO are ideal ceramic materials for precision casting of TiAl alloy, overcoming challenges associated with intricate component removal, such as turbine blades, leveraging the stability of Y 2 O 3 and the water solubility of CaO. To address these challenges, we employed Isobam104 in a novel gel casting method, serving as both a dispersant and a gelling agent. This method enabled us to create a stable Y 2 O 3 –CaCO 3 slurry with high solid content (up to 55 vol%) and low viscosity (101.51 mPa·s at a shear rate of 10 s −1 ). Following sintering at 1500 °C for 2 h, Y 2 O 3 –CaO composite ceramics were produced. Surprisingly, two distinct characteristics of CaO were noted. One showed a rod-shaped morphology with high chemical reactivity crucial for water solubility, while the other displayed a flat-like feature, forming a well-maintained interface due to its coherent or semi-coherent matching relationship with Y 2 O 3 , thereby providing excellent hydration resistance. Ultimately, we acquired composite ceramics showcasing a 30-day “shelf life" alongside exceptional water solubility. This establishes the theoretical groundwork for storing and employing soluble ceramic cores in the precision casting of TiAl alloy.
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
MOLECULES
·
2023
·Vol. 28
·期 7
·3202
·
IF 4.6
Zhonglei Meng,Rongxiu Qin,Rusi Wen,Guiqing Li,Zhongyun Liang,Junkang Xie,Zhangqi Yang,Yonghong Zhou
In this study, seven types of α-hydroxycarboxylic acids were selected to form composite catalysts with boric acid, and their catalytic properties were studied using the catalytic hydration of α-pinene. The results showed that the composite catalyst of boric acid and tartaric acid had the highest catalytic activity. With an α-pinene, water, acetic acid, tartaric acid, and boric acid mass ratio of 10:10:25:0.5:0.4, the reaction temperature was 60 °C, the reaction time was 24 h, the conversion of α-pinene was 96.1%, and the selectivity of terpineol was 58.7%. The composite catalyst composed of boric acid and mandelic acid directly catalyzed the hydration of α-pinene in the absence of a solvent. Under the optimal conditions, the conversion of α-pinene reached 96.1%, and the selectivity of terpineol was 55.5%. When the composite catalyst catalyzed α-pinene to synthesize terpineol in one step, the terpineol was optically active, and terpineol synthesized using the two-step method with the dehydration ofp-menthane-1,8-diol monohydrate was racemic. These composite catalysts may offer good application prospects in the synthesis of terpineol.Keywords:α-hydroxycarboxylic acid–boric acid complexes;green catalyst;hydration of α-pinene;solvent-free;terpineol;p-menthane-1,8-diol monohydrate
研究领域:
催化
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有机化学
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绿色化学
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DOI
PubMed
高影响因子
DESIGNED MONOMERS AND POLYMERS
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2024
·
IF 1.8
Guide Liu,Xin Zheng,Guoliang Xie,Gongliang Liu
To explore the effect of polycarboxylate superplasticizers on the strength and hydration performance of alkali slag building materials, this study prepared cross-linked polycarboxylate superplasticizers with different ratios of hydrogen peroxide, methyl allyl alcohol polyoxyethylene ether, acrylic acid, polyethylene glycol diacrylate, monomer aqueous solution, reducing agent, chain transfer agent, etc. according to certain ratios, and tested their effects on the hydration performance and strength of alkali slag building materials. Through experimental analysis, it was found that the higher the proportion of cross-linked polycarboxylate based high-efficiency water-reducing agents, the lower the initial flowability of building material slurry; The addition of cross-linked polycarboxylate water-reducing agent will prolong the initial and final setting time of alkali slag building materials, delaying the hydration time of building materials; Cross linked polycarboxylate superplasticizers can reduce the electrical conductivity of alkali slag building material slurry, delaying its hydration rate; Different ratios of water-reducing agents have a significant impact on the water reduction rate of alkali slag building materials, with V2 water-reducing agent having the highest water-reduction rate of 28.6%; Cross linked polycarboxylate superplasticizers can increase the flexural and compressive strength of alkali slag building materials. Therefore, cross-linked polycarboxylate water-reducing agents have shown great potential in regulating the properties of alkali slag building materials.
研究领域:
材料科学
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建筑工程
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DOI
PubMed
高影响因子
IEEE SENSORS JOURNAL
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2025
·Vol. 26
·期 1
·1054-1066
·
IF 4.5
Mingpeng Yang,Jinghan Cheng,Wangping Zhou,Jun Cai
The dynamic monitoring of human hydration status is essential for ensuring health and safety during work or training in high-temperature environments. Hydration status is closely associated with electrolyte concentrations in sweat, particularly sodium and potassium. Wearable sweat sensors based on potentiometric methods offer unique advantages such as low power consumption, continuous monitoring, and noninvasive operation, making them promising tools for electrolyte analysis. However, existing devices are limited by insufficient hardware–software integration for sweat collection and continuous analysis, as well as significant accuracy loss in potentiometric measurements caused by fluctuations in skin and sweat temperature. In this study, a fully integrated wearable sweat patch was developed, incorporating a microfluidic sweat collection unit, a flexible multifunctional sensor array (Na+, K+, and temperature sensors), and flexible electronic circuits. Experimental results demonstrated that the sensor array exhibited reliable linear response, repeatability, anti-interference capability, and mechanical strain tolerance. Moreover, the proposed temperature correction strategy was validated in correction solutions and on-body tests, consistently achieving superior compensation performance within the 20 °C–40 °C range. The developed wearable sweat patch with integrated temperature correction enabled high-precision, real-time monitoring of hydration status. Owing to its robust performance and multifunctional design, this device shows great potential for applications in sports performance evaluation, health monitoring, personalized management, and physiological protection under extreme environments.
研究领域:
生物医学工程
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可穿戴传感器
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生理监测
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微流控技术
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电化学传感器
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Ziqi Ren,Yifu Zhang,Tianming Lv,Xianfang Tan,Hanmei Jiang,Zhenhua Zhou,Changgong Meng
The development of electrode materials for aqueous ammonium-ion supercapacitors (NH 4 + -SCs) has garnered significant attention in recent years. Poor intrinsic conductivity, sluggish electron transfer and ion diffusion kinetics, as well as structural degradation of vanadium oxides during the electrochemical process, pose significant challenges for their efficient ammonium-ion storage. In this work, to address the above issues, the core–shell V 2 O 5 · n H 2 O@poly(3,4-ethylenedioxithiophene) composite (denoted as VOH@PEDOT) is designed and prepared by a simple agitation method to boost the ammonium-ion storage of V 2 O 5 · n H 2 O (VOH). The 3,4-ethylenedioxithiophene (EDOT) monomer polymerizes on the VOH surface to form a polymer shell resulting in the formation of VOH@PEDOT core–shell structure, and also introduces oxygen vacancies. The conductive PEDOT coating enhances the conductivity of VOH, facilitates electron transfer and transport capabilities, as well as relieves the structural degradation of VOH. As expected, with the breaking/formation of hydrogen bond between NH 4 + and V-O layers, VOH@PEDOT exhibits more efficiently reversible (de)intercalation of NH 4 + , thus having a high specific capacitance of 409F·g −1 at 0.5 A·g −1 and improve cyclic stability in NH 4 Cl/PVA electrolyte. The study demonstrates that the conducting polymer can enhance the electrochemical performance of vanadium oxides for NH 4 + -SCs, offering new insights for designing and developing vanadium oxide electrode materials for high-efficient NH 4 + storage.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Frontiers in Materials
·
2024
·
IF 2.6
Fang Yunhui,Wang Zhaopeng,Yan Dongming,Lai Huazhen,Ma Xiuxing,Lai Junying,Liu Yi,Zhong Lina,Chen Zhanhua,Zhang Xiaofang,Lin Zhijun,Wang Dongye
A series of polycarboxylate superplasticizers (PCEs) with different side-chain densities, main chain polymerization degrees, and side-chain lengths were designed and synthesized using a novel highly active ethylene glycol mono vinyl ether polyethylene glycol as the ether monomer. The influence of polycarboxylate ether on the rheological properties, interface adsorption, and hydration characteristics in cement paste was investigated through characterization of charge density, rheological properties, adsorption behavior, and hydration heat. The results indicate that the adsorption process of PCE on cement particles is spontaneous physical adsorption, and the hydration kinetics fitting reveals that the geometric crystal growth exponent n is in the range of 1–2, with needle-like and lamellar hydration products formed. With a decrease in side-chain density, the broadening of molecular weight distribution and the increase of charge density accelerate the flow of slurry, reduces saturation adsorption, and delays cement hydration. A decrease in main chain polymerization degree results in a downward trend in molecular weight and charge density, leading to larger molecular conformations, reduced slurry flow, decreased saturation adsorption, and delayed cement hydration. As the side-chain length of PCE (molecular weight) increases, the charge density decreases, and the molecular conformation exhibits a compact structure with reduced slurry flow, decreased saturation adsorption, and delayed cement hydration. In cases of low side-chain density, short side chains, and low molecular weight, enhanced adsorption capacity and faster adsorption rates are observed, resulting in the lower viscosity and a delay in the cement hydration process.
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
Applied Materials Today
·
2026
·
IF 7
Man Li,Xuelong Wang,Min Liang,Bingjie Fu,Jieting Chang,Xingpu Liu,Huidi Meng,Hailin Zhang,Changyou Gao
Composite xerogels composed of chitosan and BaSO 4 particles. • Optimal formulation of CS/BaSO 4 xerogels for multimodal imaging. • Hydrated xerogels with appropriate modulus and tissue compatibility. • Resistance of displacement post implantation in vivo . Tissue markers can effectively indicate diseased sites within the body. However, conventional metal-based markers are severely limited by imaging artifacts and high migration risks resulting from mechanical mismatch with soft tissues. Herein, we developed a composite xerogel system composed of chitosan and BaSO 4 particles. Through comprehensive screening, 20–40 wt% BaSO 4 was established as the optimal functional window, within which 40BS-C (a composite xerogel containing 40 wt% BaSO 4 and 60 wt% chitosan) was identified as the optimal formulation for balancing multimodal micro-CT/ultrasound (US)/magnetic resonance imaging (MRI) and mechanical compliance. Upon hydration equilibrium, the compressive modulus of approximately 10 MPa was significantly lower than that of metallic or other rigid materials. Favorable imaging capabilities were shown in both micro-CT and US in vitro . Furthermore, volume swelling and the formation of a moderately thick fibrous capsule provided effective physical anchoring, resulting in significantly lower relative displacement of the markers (4.4–4.6 mm) compared to the metallic counterparts (6.9 mm). A 6-month in vivo animal study confirmed that the markers exhibited favorable multimodal imaging stability (with a micro-CT signal-to-background ratio of 5.43 for the optimal 40BS-C, and an overall US dimensional deviation < 5%) and biocompatibility compared with clinical titanium markers. In summary, this optimized multimodal and anti-migratory marker system provides a reliable strategy for precise lesion localization, demonstrating promising potential for clinical translation. Download: Download high-res image (171KB) Download: Download full-size image
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DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
·
IF 5.4
Mingxue Song,Xu Bai,Yuebing Liu,Jian Liu,Meiguang Jiang,Yuheng Ma,Yibo Liu
Copper ions promote selective dithiooxamide adsorption on chalcopyrite. • The adsorbed layer increases chalcopyrite hydration and suppresses flotation. • Molybdenite remains floatable, enabling low-dosage copper-molybdenum separation. Efficient separation of chalcopyrite and molybdenite remains challenging because both minerals exhibit high natural floatability, which limits the development of a stable flotation contrast in bulk Cu-Mo concentrates. Dithiooxamide (DTO) was used as an organic ligand to selectively depress chalcopyrite under near-neutral conditions. Single-mineral micro-flotation showed that, at pH 7 with 9 mg/L Cu 2 + and 8 mg/L DTO, chalcopyrite recovery decreased to 0.42%, whereas molybdenite recovery remained approximately 80%. When used individually, Cu 2+ and DTO yielded chalcopyrite recoveries of 83.42% and 69.31%, respectively, indicating that their combined use markedly enhanced chalcopyrite depression. For an artificial mixed mineral treated at pH 7 with 6 mg/L Cu 2+ and 8 mg/L DTO, the concentrate contained 44.95% Mo at 78.34% recovery. The corresponding Cu grade and recovery were 8.66% and 26.12%, respectively. Cu 2+ /DTO treatment reduced the chalcopyrite contact angle from 92.98° to 68.50° and increased its mean local impedance from 110149 to 162525 Ω. In contrast, the wettability and impedance of molybdenite changed only slightly. FTIR, SEM-EDS, and XPS analyses suggest that DTO-related species are preferentially enriched on chalcopyrite. These results are consistent with the formation of a polar interfacial layer that increases chalcopyrite hydrophilicity while exerting a limited effect on molybdenite. The findings provide an interfacial-chemistry basis for a low-alkalinity, low-dosage reagent scheme for Cu-Mo separation. Download: Download high-res image (261KB) Download: Download full-size image
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DOI
高影响因子
危险品化学品经营许可证（带存储）