CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Wang Baomin,Deng Shuang
Graphene nanoplatelets (GNPs) with extraordinary mechanical properties have been widely cooperated in special and high-performance composites. However, the impact of GNPs on hydration process in cement composites is still ambiguous and controversial. In this research, the GNPs was dispersed by dispersants with ultrasonication. The GNPs/cement composites were prepared and their hydration process were monitored by isothermal calorimetry (TAM Air) and 29 Si NMR analysis. In addition, the pore structure and microstructure of GNPs/cement composites were tested with Mercury intrusion porosimeter (MIP) and Scanning electron microscope (SEM). And phase analysis was discussed by analysis of XRD and TG/DTG spectrums. The experimental results suggest that GNPs may contribute to accelerate the hydration reaction and more hydration products generated because of sufficient ion exchange in earlier ages and in this basis, a more compact microstructure and better mechanical properties of GNPs cement composites achieved.
研究领域:
材料科学
·
土木工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 6
·2445
·
IF 3.4
Run Shi,Yuehan Hao,Deping Chen,Wenxin Liu
Reactive magnesia cement is considered an eco-efficient binder due to its low synthesis temperature and CO2absorption properties. However, the hydration of pure MgO–H2O mixtures cannot produce strong Mg(OH)2pastes. In this study, nesquehonite (Nes, MgCO3·3H2O) was added to the MgO–H2O system to improve its strength properties, and its hydration products and pore structure were analyzed. The experimental results showed that the hydration product changed from small plate-like Mg(OH)2crystals to interlaced sheet-like crystals after the addition of a small amount of Nes. The porosity increased from 36.3% to 64.6%, and the total pore surface area increased from 4.6 to 118.5 m2/g. At the same time, most of the pores decreased in size from the micron scale to the nanometer scale, which indicated that Nes had a positive effect on improving the pore structure and enhancing the compressive strength. Combined with an X-ray diffractometer (XRD), a Fourier transform infrared spectrometer (FTIR), and a simultaneous thermal analyzer (TG/DSC), the hydration product of the sample after Nes addition could be described as xMgCO3·Mg(OH)2·yH2O. When Nes was added at 7.87 and 14.35 wt%, the x-values in the chemical formula of the hydration products were 0.025 and 0.048, respectively. These small x-values resulted in lattice and property parameters of the hydration products that were similar to those of Mg(OH)2.Keywords:nesquehonite;reactive magnesia;Mg(OH)2;magnesium carbonate hydroxide;pore structure;nanopore
研究领域:
材料科学
·
土木工程
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Shuai Peng,Longqian Xu,Shihai Deng,Yunfeng Mao,Zhenyu Zhao,Deli Wu
The solar-driven evaporation technology provides a green alternative for solving water scarcity. However, it remains challenging to improve the steam conversion efficiency due to the difficulties in simultaneously coordinating light absorbance, water regulation, and thermal management for broadband solar evaporators. Here, an unconventional solar evaporative modulator material─ultra-interfacial adherent dimethyl sulfoxide polyvinyl alcohol (DMSO–PVA) hydrogel (DPH) was presented. The material is based on the regulation of the PVA–PVA intra- and PVA–water interchain hydrogen bonds by DMSO, which established an adaptive high-cross-linking and homogeneous network. The consequent ultra-thin hydrogel exploited an insulating polymer backbone and intracavity hydration domain to simultaneously improve the light absorption and thermal localization and activate the water molecule. As a proof-of-concept, under 1 sun illumination (1 kW m–2), a DPH-based graphene fiber membrane [ultra-thin hydrogel membrane (UHM)] achieved 97% light absorption, 2.33 kg m–2 h–1 water evaporation, and high salt-resistant evaporation (1.48 kg m–2 h–1 under 25 wt % brine). Compared to the pure graphene membrane, UHM increased the vaporization by 64%, decreased the heat diffusion by over 14-folds, and reduced the environmental heat loss by 2.6-folds. DPH possesses scalability and versatility in bridging nanoscale photothermal materials and solar evaporator geometric architecture and will facilitate the possibility of advanced solar thermal applications.
研究领域:
材料科学
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能源工程
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2021
·Vol. 138
·期 42
·51253
·
IF 3.125
Hao Wang,Yihang Gao,Xuhong Jia,Quanyi Liu
Present polymer inhibitors depend on a major inhibitory group to restrain bentonite hydration, and monomer design is concerned to improve the inhibition and stability through complex copolymerization. Conveniently, a homopolymer (PIL-NH 2 ) that contained primary amine and cationic imidazolium as bi-functional groups was proposed, aiming to provide two synergistic inhibitory modes. Comprehensive methods were conducted to characterize the chemical structure and inhibitory performance of PIL-NH 2 . The ζ potential absolute value of bentonite suspension was decreased by PIL-NH 2 from 28.7–33.3 mV to 4–7 mV, and the increment of bentonite particle size d 50 was observable from 1.83892 μm to over 200 μm. With water squeezed out, the lattice spacing d 001 of hydrated bentonite was reduced from 1.9070 to 1.2683 nm due to PIL-NH 2 intercalation. The ESEM images revealed that inhibited bentonite showed a tight structure with classical dehydration phenomenon, and the hydrogen bond between PIL-NH 2 and bentonite was further confirmed according to the FT-IR result. In mechanism analysis, the electrostatic attraction and hydrogen bond existed simultaneously for PIL-NH 2 to adsorb bentonite. The two adsorption modes from bi-functional groups were synergistic to improve inhibition remarkably. PIL-NH 2 maintained high performance during the whole hydration process, including crystalline hydration, osmotic hydration, and hydrated dispersion.
研究领域:
材料科学
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地质工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Qinglong Xie,Yuqiang Zhou,Yilei Wang,Tongbo Pan,Ying Duan,Shangzhi Yu,Weirong Ji,Yong Nie
Catalytic hydration of acrolein to 3-hydroxypropionaldehyde (3-HPA) is a key step for the chemical production of 1,3-propanediol (1,3-PDO) from renewable glycerol. However, a main issue of low reaction rate and long reaction time exists in the conventional hydration process. Here, we developed a microwave-assisted system for the efficient conversion of acrolein to 3-HPA. Simultaneous cooling method was adopted to maintain continuous microwave irradiation and meanwhile stable temperature during the reaction. The effects of catalyst type, temperature, catalyst loading and microwave power on acrolein conversion and 3-HPA selectivity were examined. Kinetic study showed that microwave irradiation could help for the reduction in activation energy, which led to acceleration in reaction rate during the acrolein hydration process. In addition, the density functional theory (DFT) calculations on the adsorption and reaction behavior of reactants molecules on the catalyst are consistent with the experimental results, which confirm the intensification effect of the microwave field.
研究领域:
化学工程
·
催化
·
可再生能源
·
理论化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY
·
2023
·
IF 9
Danchao Huang,Xin Li,Yang Bai,Gang Xie,Shilin Chen,Hong Chen,Jian Zhang,Renxin Liang,Pingya Luo
Inhibiting the surface hydration of clay is the main task for the water-based drilling fluids used in the development of shale gas . Branching polyethyleneimine (BPEI) completely inhibits the clay surface hydration. However, the use of BPEI is limited by its high toxicity. In this paper, BPEI was modified by grafting with hydroxyethyl groups to reduce the toxicities of BPEI hydration inhibitors . The structures and properties of the modified BPEI were characterized by infrared spectroscopy, mass spectrometry, the luminescent bacteria method, isothermal adsorption, X-ray diffraction, thermogravimetric analysis, contact angle measurement , scanning electron microscopy, X-ray photoelectron spectroscopy and molecular simulations. The relative luminescence rate of the modified BPEI inhibitors increased from 14 % to 62 % with increases in the number of grafted hydroxyethyl groups. After hydrated sodium montmorillonite (Na–Mt) contacted the modified BPEI inhibitors, the basal spacings of the Na–Mt decreased from 1.90 nm to a minimum of 1.40 nm, and the DTG curve had only one low-temperature peak. Molecular simulations showed that the energy for adsorption of the inhibitor on the Mt surface increased with increases in the number of grafted hydroxyethyl groups. These results suggested a structure-activity relationship for inhibition and the biological toxicity of the modified BPEI inhibitor. That is, within the range of 20:1 to 5:1 for the molar ratios of amino and hydroxyl groups, increases in the number of grafted hydroxyethyl groups gradually decreased the biological toxicities of BPEI inhibitors, and the inhibition performance was gradually enhanced. BPEI-OH4 (amino:hydroxyl = 5:1) showed the best performance among the modified BPEI inhibitors. This provides an excellent inhibitor and a low-toxicity modification method, which will facilitate the development of environmentally friendly high-performance water-based drilling fluids.
研究领域:
材料科学
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环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2023
·
IF 19
Ben Wu,Guofang Zhang,Jiawen Ji,Rong-Hua Luo,Junkang Chen,Feng-Liang Liu,Emerson Coy,Sergio E. Moya,Qi Li,Xiaoman Suo,Xinyue Chen,Yong-Tang Zheng,Yang Li,Guocheng Wang
In this study, a novel strategy is developed for the first time, referred to as high-concentration cobalt ion-assisted hydration (HCCAH) utilizing zeolitic imidazolate framework-67 (ZIF-67) as a precursor, to produce independent and flat α-cobalt hydroxide nanosheets (CHN). These nanosheets offer abundant contact sites for binding with virus surface proteins. The formation of CHN involves the in situ transformation from ZIF-67, due to the matching of the hydrolysis rate of ZIF-67 and in situ growth rate of cobalt hydroxide orchestrated by high concentration of cobalt ions. Notably, the CHN contains a higher proportion of trivalent cobalt, which is shown to enhance the binding with the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Spike protein and induce protein structural denaturation, as demonstrated by molecular dynamics (MD) simulation. Antiviral experiments using pseudovirus and authentic viruses have confirmed the promising antiviral performance of CHN. Furthermore, both in vitro and in vivo experiments have demonstrated the excellent biocompatibility of CHN. This research opens up new possibilities for the application of cobalt hydroxide nanosheets and serves as a valuable reference for the design of antiviral nanomaterials.
研究领域:
材料科学
·
病毒学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Hao Zhang,Xueling Xu,Guangyao Zhang,Jie Yang,Yi Lu
Developing active and stable electrocatalysts for oxygen evolution reaction is of great significance to generate oxygen and hydrogen by seawater electrolysis, which however remains some issues that high energy consumption and chloride corrosion. Here we pioneered a polymer/inorganic hybrid engineering strategy for achieving excellent salt resistance solar evaporation and oxygen evolution performance (OER). The La 0.9 Sr 0.1 CoO 3 /nickel foam–cellulosic aerogel (LSC1/NF–CA) was synthesized by engineering Trimethylamine N–oxide (TMAO) polymer brush onto the surface of hybrid aerogels composed of La 0.9 Sr 0.1 CoO 3 /Ni foam (LSC1/NF) and cellulose/polyvinyl alcohol, which has good hydrophilic features, intrinsic solar capture capacity, and stable OER performance in seawater. Benefiting from the synergy of solar desalination with surface hydration effect of TMAO, the LSC1/NF–CA presents a superior catalytic activity , requiring a lower overpotential of 341 mV and a tafel slope of 58.2 mV dec −1 at 10 mA cm −2 under 6.0 sun illumination . Our results establish a new strategy that can guide the design of stable and efficient polymer/inorganic hybrid catalysts, which shows a promising prospect as alternatives to noble metal–based catalysts for seawater splitting.
研究领域:
材料科学
·
催化化学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Energy Research
·
2024
·
IF 2.6
Zhang Shusong,Liu Tianyu,Chen Qingyuan,Xiao Bao,Xian Xiaokang,Ye Zhongbin
The study investigated the effects and mechanisms of clay content, emulsion water content, pH, and metal cations on clay-crude oil emulsions. The results indicate the following: 1) At a water content of 50 V/V%, montmorillonite can form emulsions with crude oil at different concentrations, with the highest stability observed at 5 wt% content. In contrast, chlorite, illite, and kaolinite cannot form emulsions at low concentrations. 2) Under acidic conditions, montmorillonite, illite, and chlorite cannot form emulsions with crude oil, or the emulsions are highly unstable. However, kaolinite forms more stable emulsions under acidic conditions. In alkaline environments, emulsions formed by all clay minerals exhibit increased stability. 3) The order of the effectiveness of different metal cations in reducing the stability of montmorillonite-crude oil emulsions is K+ > Na+ > Mg2+ > Ca2+, while for chlorite, illite, and kaolinite, it is Mg2+ > Ca2+ > K+ > Na+. 4) The factors that influence the stability of clay-crude oil emulsions are the arrangement of clay particles in water and the dispersion capability of clay particles in water. The most significant influencing factor is the arrangement of clay particles in water.
研究领域:
化学工程
·
材料科学
·
石油工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2024
·
IF 7.4
Bin Zeng,Wenjin Han,Shaojie Jia,Liwu Mo
Grinding aids and hydration accelerators (GA-HAs) are important admixtures for reducing energy consumption and enhancing cement performance, however, widely used alkanolamine GA-HAs have the drawback of only enhancing early strength while contributing little to the later strength development. In this study, a new amide-alcohol bearing admixture named Diethanolamine-Citrate (DC) was synthesized by using diethanolamine (DEA) and citric acid (CA). The addition of DC improved the particle size distribution of cement, delayed the initial setting time and shortened the final setting time of cement, and enhanced the fluidity of cement. The 28d compressive strengths of cement mortar added with DC were 16.4 % and 11.4 % higher than that of control group and cement mortar added with TEA, respectively. The incorporation of DC promoted the dissolution of cement, accelerated the overall hydration process of cement, increased the production of C-S-H and AFm, reduced the pore size and porosity, produced smaller (Sub-micron grains and nano-grains), tightly accumulated and partially amorphous CH. Moreover, CA is cheap and readily available industrial product that can reduce the cost of GA-HAs as synthetic feedstock . This study represents a breakthrough in preparing organic cement GA-HAs and provides a new approach to developing a novel type of amide-alcohol cement admixtures .
研究领域:
建筑材料学
·
材料化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
·
2019
·
IF 1.479
Kun Wang,Hao Pang,Hao Huang,Linxia Song,Jianheng Huang,Yangyang Zhao
Multi-armed polycarboxylate superplasticizers (SPCEs) were prepared via esterification-copolymerization in aqueous media from various polyols (including glycerol, xylitol and mannitol), acrylic acid (AA) and isopentenyl oxy polyethylene glycol ether (TPEG). The structures of the SPCEs (SPCE-prop, SPCE-pent and SPCE-hex bearing three, five and six arms, respectively) were characterized by NMR and GPC. The influences of the SPCEs on the fluidity, adsorption and early hydration behaviors of cementitious systems were investigated in detail and are discussed herein. Experimental results indicated that as the number of pendant arms increased, the dispersion performance, compactness of the cement microstructures and set retarding effects increased initially and subsequently decreased (SPCE-pent offered the best performance). This effect was primarily due to the synergistic effects of steric hindrance and electrostatic repulsions. Further results indicated that SPCE-pent can be used as a high-range delivery admixture to produce high performance concrete.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
FOOD CHEMISTRY
·
2025
·
IF 9.8
Zhiling Tang,Yiyuan Zou,Haoran Luo,Zehua Zhang,Fayin Ye,Guohua Zhao
Buckwheat noodles (WB) are always superior in health effects but inferior in textural quality to wheat noodles (W). Artemisia sphaerocephala Krasch gum (AsKg) has been proven to be an improver for the latter. To elaborate on this, the effects of physical state (dry or pre-hydrated) and addition mode (pre-addition or delayed addition) of AsKg on the quality of buckwheat noodles (buckwheat:wheat = 3:7, w/w) were investigated in this work as four procedures, namely, dry/pre-addition (DP), dry/delayed addition (DD), pre-hydrated/pre-addition (HP), and pre-hydrated/delayed addition (HD). The dough mixing property, water distribution, rheological behavior, the structure of the gluten network, and noodle quality were determined. The results indicated that on most occasions, the improvements were in a procedure order of HP > DD > HD > DP, corresponding to the same order in their levels of gluten hydration. These findings are of practical significance for producing high-quality buckwheat noodles.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）