CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Huiting Liu,Jianzhou Jin,Yongjin Yu,Huimin Liu,Shuoqiong Liu,Jiyun Shen,Xiujian Xia,Hongfei Ji
Excellent physical and chemical properties of halloysite nanotube make it potential to reinforce cement composites. In this study, effects of halloysite nanotube on mechanical properties of oil well cement were investigated. The results showed that the compressive and flexural strength of cement with 3% halloysite nanotube was increased by 40.8% and 49.2%, respectively and the elasticity modulus decreased by 20.01% after curing for 28 days, which demonstrated that halloysite nanotube cement had high strength and good toughness. TG-DTA, SEM, XRD, MIP tests were carried out to study the hydration products and microstructure changes in cement samples after adding halloysite nanotube. Optimized hydration products, lower permeability up to 38.82%, cross-linking and denser microstructure all contributed to excellent mechanical properties of oil well cement with halloysite nanotube.
研究领域:
材料科学
·
石油工程
·
水泥化学
·
纳米复合材料
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Guodong Zhang,Zhe Liu,Yaning Kong,Fei Wang
Hydrate-based adsorption and hydration natural gas (AHNG) technology was reported to achieve large methane storage density under mild conditions. In order to enhance methane uptake, a composite nano porous material of MIL-101(Cr)@AC was prepared through fluorine-free hydrothermal reaction, and methane adsorption isotherms for both dry and wet samples were measured under hydrate favorable conditions. Hydrate in-situ formation loaded by the composite material was also carried out, while hydrate kinetics was evaluated by Raman spectrum. It was found that MIL-101(Cr) remains cubic symmetric structure when activated carbon (AC) was doped, but its size decreases with the increase in AC doping amount, while the specific surface area and pore volume significantly increase, and this enhances methane adsorption that increases by 65.58%. More enhanced methane uptake was obtained when wet sample was applied due to adsorption and hydration synergy, wherein methane physical adsorption ability remains, while formed hydrate stores extra methane. The contribution of hydrate to methane uptake is up to 40%, so large methane storage density is anticipated, methane volumetric uptake is up to 179.3 V/V under a mild condition (9.3 MPa and 274.15 K), which increases by 38.03%. Compared with our recently reported ZIF-8@AC, methane storage capacity in this new material increases by 36.5% (Chem. Eng. J., 2023, 455, 140503). In addition, hydrate progressive growth with the increase in adsorption pressure was observed, the area ratio of hydrate large cages to small one finally approaches to the theoretical value of 3:1, suggesting approximately complete conversion of pre-adsorbed water.
研究领域:
材料科学
·
能源化学
·
多孔材料
·
气体储存
·
物理化学
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2026
·
IF 19.9
Xun Wang,Yin Qiao,Zesheng Song,Lirong Yang,Yang Yu,Ziye Yu,Chu Zeng,Sitong Peng,Feng Liu
Polyimide (PI) is recognized as a high-performance biomaterial membrane due to its high mechanical strength, excellent biocompatibility, biological stability, and highly tunable chemical structure. However, the intrinsic hydrophobicity of PI blood fluid contact ultrafiltration (UF) membrane materials poses risks related to separation efficiency and stability, as well as complications arising from biofouling and immune cascades. In this study, benzimidazolium-based phosphorylated zwitterionic PI (BI-ZFPI-Me/Et/ i -Pr) polymers were synthesized via polycondensation and phosphorylation using three different reagents (MeOEP, EtOEP, and i-PrOEP). These polymers were then used to prepare intrinsic flat-sheet blood-contacting UF membranes via NIPS. All phosphorylated zwitterionic PI membranes not only exhibited reduced water contact angle (19.8°/17.0°/16.8°vs. 57.2°) but also demonstrated superior UF performance, with FRR values exceeding 93% and cycle stability far surpassing that of the pristine BI-FPI membrane (76.9%). Among the three zwitterionic membranes, BI-ZFPI-Me, due to its optimal hydrophilic-hydrophobic balance, showed excellent hemocompatibility—including a hemolysis rate < 0.5%, high plasma recalcification time (28 min), and anti-complement activation—while BI-ZFPI- i -Pr exhibited the best cell viability (93.3%), enhanced endothelial cell compatibility, and promoted M2 macrophage polarization. This study indicates that intrinsic zwitterionic phosphate polyimides show promising potential in biomaterial separation membranes due to excellent multifunctional biological anti-fouling, anticoagulation, and biocompatibility.
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Yunqi Zhao,Xiaochuan Xu,Zheng Sun,Xiaowei Gu
This study investigates the influence of calcination temperature (650 °C, 750 °C, 850 °C) of magnesite tailings on the hydration properties, microstructure and performance of basic magnesium sulfate cement (BMSC) prepared using the calcination products. Through isothermal calorimetry, compressive strength tests, water resistance evaluation and hydration products analysis, the influencing mechanism was systematically investigated. The results indicate that a lower calcination temperature (650 °C) resulted in the greatest specific surface area and the reactivity of α -MgO in the calcined magnesite tailings. The setting time, hydration rate, and microscopic morphology of the 5·1·7 phase were predominantly influenced by reactivity variation from calcination temperature. Lower calcination temperatures led to the formation of magnesia with higher reactivity. This higher reactivity shortened the setting time of BMSC, advanced the acceleration period and facilitated the formation of the 5·1·7 phase with higher aspect ratios. In contrast, the cumulative heat of hydration, compressive strength, water resistance, and content of hydration products reached their optimum values when the tailings were calcined at 750 °C, which can be attributed to the highest α -MgO content achieved at this temperature. An excessive calcination temperature (850 °C) resulted in substantial formation of Mg(OH) 2 , which was detrimental to strength development. The BMSC prepared from magnesite tailings calcined at 750 °C exhibited excellent mechanical properties and water resistance, and reduced carbon emission and energy consumption by more than 60 % compared to Portland cement and about 30 % compared to conventional BMSC, demonstrating its feasibility and environmental benefits for BMSC production.
研究领域:
材料科学
·
水泥化学
·
可持续建筑材料
·
水化动力学
·
矿物加工
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Yanqi Gu,Shayu Li,Yuehong Xu,Jiaguang Han,Miao Gu,Zhipeng Cai,Yan lv,Guoxin Xie,Tianbao Ma,Jianbin Luo
The influence of an external magnetic field on the picosecond network dynamics of the salt (KCl) solution is investigated by terahertz time-domain spectroscopy. Because hydration changes the motions of water molecules clusters, we test hydration by measuring the change of dielectric loss caused by the slow relaxation of water molecules clusters. We find experimentally that the magnetic field enhances the number of water molecules involved in hydration and the radius of dynamic hydration layer in salt solutions. However, with the increasing concentration, there is a downward in the hydration enhancement per equivalent. Meanwhile, the simulated results show the number of water molecules in hydration layers increases which is consistent with our experimental results. Besides, the simulation reveals that external magnetic field mainly affects the second hydration layer and the stability of water molecules network in hydration layer is enhanced with external magnetic field .
研究领域:
物理化学
·
生物物理
·
分子生物学
·
光谱学
·
溶液化学
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2021
·
IF 6.141
Xiaoling Wang,Chenchen Gong,Jianguo Lei,Jing Dai,Lingchao Lu,Xin Cheng
The main focus of this study was to investigate the effect of silica fume (SF) and nano-silica (NS) on hydration behavior and mechanism of high sulfate resistance Portland cement (HSRPC), and were analyzed in terms of chemical shrinkage, setting time, compressive strength, rheology, pore structure, hydration heat, and hydration products. Experimental results showed that 5 wt% SF deepened the secondary hydration reaction of HSRPC, because calcium hydroxide (CH) produced by HSRPC hydrating effectively stimulated the pozzolanic activity of SF at later ages. Compared with HSRPC, the 28 d total porosity and CH content of HSRPC with 5 wt% SF respectively reduced by 6.1% and 4.4%. The corresponding compressive strength increased by 14.4%. 0.1–0.3 wt% NS moved up the acceleration period of the hydration and reduced setting time. Meanwhile, NS with high pozzolanic activity evidently increased chemical shrinkage and compressive strength at early ages. Compared with HSRPC, the 28 d total porosity of HSRPC with 5 wt% SF and 0.3 wt% NS reduced by 16.3%. The CH content in TG-DTG curve was reduced by 24.7%, which was consistent with the reduction of CH characteristic peak value. Therefore, in the later hydrating process, the synergistic effect of SF and NS significantly promoted the second hydration reaction.
研究领域:
土木工程
·
材料科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Xiaoda Wang,Yuqing Zhao,Lumin Han,Ling Li,Anton A. Kiss
Cylcohexanol is an essential bulk chemical that can be produced via cyclohexene hydration, a liquid-liquid two-phase reaction that is limited by the low reaction rate and the equilibrium conversion. Adding an appropriate solvent is the most promising method to break through these limitations. However, in previous works the solvent was almost blindly selected without a global consideration. In this work, a rational multiscale method is proposed for the effective selection of an economical and sustainable solvent for the direct hydration of cyclohexene. At the molecular scale, liquid-liquid phase equilibrium was estimated using group contribution methods to rapidly screen the potential solvent candidates from a range of organics, based on the partition coefficient. At the reactor scale, the candidates were experimentally investigated to pick out the solvents that could significantly improve the conversion, without introducing side reactions or deactivating the catalyst. At the process scale, the total annual cost (TAC), CO 2 emission, and other metrics were calculated to evaluate the eco-efficiency of all solvents. Using this multi-scale method, acetophenone was selected as an eco-efficient solvent from over 100 organics, resulting in the reduction of TAC by 8 % and CO 2 emission by 17 % in the production process. Using acetophenone also led to the increase of cyclohexanol yield from 12.3 % to 27.6 % without the occurrence of side reactions and catalyst deactivation.
研究领域:
化学工程
·
可持续化学
·
过程系统工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2021
·
IF 6.141
Zhengbin Yan,Pengwei Yang,Jiaxin Huang,Qian Jia,Jing Wen,Jinmei Dong,Weixin Zheng,Chenggong Chang,Hongning Wang,Ruoyu Chen
In this work, the Magnesium oxychloride cement (MOC) added with five kinds of inorganic salts (CaCl 2 , Ca(NO 3 ) 2 , KCl, LiCl, and NH 4 NO 3 ) were prepared under the low temperature (5 ℃), and the effects of inorganic salts on the hydration reaction and engineering properties were investigated. The results show that the addition of inorganic salt can significantly improve the hydration reaction rate, increase the content of the 5-phase, and shorten the curing time. Compared with pure MOC, the compressive strength of MOC added with CaCl 2 increased by about 128% after 7 days of curing. Moreover, the existence of inorganic salts weakened the surface shielding layer [Mg(H 2 O) 6 ] 2+ of active MgO, thereby improving the zeta potential of active MgO and promoting the diffusion rate of Mg 2+ . Overall, these results could provide valuable information for studying the hydration reaction and engineering performance of MOC at low temperatures.
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
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
·
2015
·Vol. 54
·期 3
·385-396
·
IF 3.83
Qiuwen Wang,Hui Tang,Peiyi Wu
Dynamic phase transition and self-assembly mechanism of thermosensitive poly(ethylene oxide)- b -poly( N -vinylcaprolactam) (PEO- b -PVCL) copolymer are explored deeply. A gradual dehydration process with predominated hydrophobic interactions among copolymer chains in the phase transition process distinguishes the copolymer from homopolymer. PVCL in the inner zone is restricted and counter-balanced by the PEO segments based on the sequence order of representative groups during the heating-cooling cycles. Remarkably, PEO shell experiences unusual hydration process, which is first discovered. This hydrophilic shell plays as water absorption sponge layer and captures expelled water from PVCL core, accompanied by gradient distribution of water existed in the assembly structures. Peculiarly, pseudo-linear changes of the integral area of free CO are presented compared with inflection point in the hydrated CO integral area, which propose that a part of hydrated CO forms incomplete dehydrated states. During the cooling process, perfect reversibility is observed without obvious hysteresis. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016 , 54 , 385–396
研究领域:
高分子科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Yuyao Zhang,Xiaoying Zhu,Baoliang Chen
The adhesion force evolution of protein on surfaces with continuously varied hydrophobicity/hydration layer has not been completely clarified yet, limiting the further development of environmental applications such as membrane anti-biofouling and selective adsorption of the functional surfaces. Herein, chemical force spectroscopy using atomic force microscopy (AFM) was utilized to quantify the evolution of the adhesion forces of protein on hydration surfaces in water, where bovine serum albumin (BSA) was immobilized on an AFM tip as the representative protein. The stiffness, roughness and charge properties of the substrate surfaces were kept constant and the hydrophobicity was the only variant to monitor the role of hydrated water layers in protein adhesion. The adhesion force increased non-monotonically as a function of hydrophobicity of substrate surfaces, which was related to the concentration of humic acid, and independent of pH values and ionic strength. The non-monotonic variation occurred in the range of contact angle at 60−80° due to the mutual restriction between solid–liquid interface energy and solid–solid interface energy. Hydrophobic attraction was the dominant force that drove adhesion of BSA to these model substrate surfaces, but the passivation of hydration layers at the interface could weaken the hydrophobic attraction. In contrast to the measurements in water, the adhesion forces decreased as a function of surface hydrophobicity when measured in air, because capillary forces from condensation water dominated adhesion forces. The passivation of hydration layers of protein was revealed by quantitatively determining the evolution of adhesion forces on the hydration surfaces of varying hydrophobicity, which was ignored by traditional adhesion theory.
研究领域:
生物物理学
·
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Jianyu Xu,Qing Liu,Hongda Guo,Miaomiao Wang,Zongjin Li,Guoxing Sun
Concrete usually possesses drawbacks of low flexural strength and prone to crack. In this research, Field's metal with a low melting point was introduced into the cement matrix to improve the crack resistance, thereby enhancing the flexural strength and toughness of cement matrix. A comparative study was conducted to elucidate the effects of the Field's metal on the mechanical behavior , microstructure, capillary permeability, hydration, and electrical properties of cement paste . By tuning the fraction of the Field's metal, the flexural strength and toughness showed the highest increase of 41% and 94%, respectively. The enhancement of flexural properties can be attributed to the filling effect of the low melting metal into the voids in the matrix, bridging effect of metal particles and the higher flexural strength as well as the higher fracture toughness of the metal. This approach opens a new research direction for the design and application of an innovative functional building materials .
研究领域:
土木工程
·
建筑材料
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2019
·
IF 4.046
Wenguang Jiang,Xiangguo Li,Yang Lv,Dongbing Jiang,Zhuolin Liu,Chenhao He
Substituting part of cement clinker with superfine blast furnace slag (SFBFS) is a wonderful way to solve the problems of environmental pollution and resource consumption caused by cement manufacture. In this study, a low clinker cement containing high volume SFBFS was prepared with nano silica (NS) for property improving. The low clinker cement containing no more than 70% SFBFS exhibited higher mechanical strength than plain cement. At 90 d, the compressive and flexural strength of low clinker cement containing 70% SFBFS were 9.8% and 27.3% higher than that of plain cement. The hydration exothermic action of low clinker cement were significantly decreased, in comparison to plain cement. The results of X-ray powder diffraction and thermogravimetric analysis revealed that SFBFS was involved in the pozzolanic reaction, resulting in the consumption of CH and the production of C-S-H. The result of mercury intrusion porosimetry demonstrated that the incorporation of SFBFS refined the pore structure of blended cement pastes. In addition, NS played an important role in improving the mechanical strength, promoting the hydration and modifying the pore structure of low clinker cement blended with SFBFS.
研究领域:
建筑材料学
·
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）