CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2019
·
IF 1.911
Junqiang Zhang,Shu Zhang,Mei Zhong,Zhi Wang,Guoyu Qian,Junhao Liu,Xuzhong Gong
CaO needs to show high activity to be used as Ca-sorbent and slagging agent. Hydration activity is an important characteristic to evaluate the activity of CaO. In this study, carbide slag from polyvinyl chloride (PVC) industry was utilized as precursor for preparing high activity CaO. The roles of crystallite grain, average pore diameter (APD) and volume fraction of pore < 200 nm in diameter (VF200) in hydration activity of CaO from carbide slag (CS-CaO) were respectively investigated. The hydrolysis kinetics model of CaO shows a three-dimensional spherically symmetric diffusion model (D4), which suggests that hydration activity was mainly associated with APD and VF200 of CS-CaO with limited correlation to the crystal size. Specifically, the hydration activity of CS-CaO is increased with increasing VF200, while decreased with increasing APD. Under the invariable calcination temperature, the core–shell structure formed by the addition of graphite or CaCO 3 to CS effectively inhibits the sintering of CS-CaO and improves VF200. Consequently, the hydration activity of CS-CaO increased from 22.79 °C·min −1 to 27.19 °C·min −1 and to 29.27 °C·min −1 , with addition of 5% graphite or 5% CaCO 3 into carbide slag, respectively.
研究领域:
材料科学
·
环境工程
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产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2017
·
IF 3.169
Jinfeng Sun,Hu Shi,Binbin Qian,Zhiqiang Xu,Weifeng Li,Xiaodong Shen
This work investigates the influence of synthetic C-S-H/polycarboxylate(PCE) nanocomposites (CPNs) on the hydration and properties of hydrated cement pastes. HPEG-PCE copolymers exhibiting side chain length of 45 ethylene oxide (EO) units was utilized to synthesize CPNs by precipitating C-S-H from Na 2 SiO 3 and Ca(NO 3 ) 2 in the PCE solution. A Box-Behnken Design (BBD) for the Response Surface Methodology (RSM) was employed to statistically optimize the sizes of the resultant. The prepared CPNs were characterized by particle size distribution (PSD), X-ray diffraction (XRD), Fourier transform infrared spectra (FT-IR) and thermo gravimetric/derivative thermo gravimetric (TG/DTG) analyses. The influence of CPNs on the hydration properties of cement were assessed and discussed in terms of hydration kinetics, mechanical properties, phase composition and pore structure analysis. The experimental results showed that the optimum synthetic parameters, an experimental temperature of 30.1 °C, reactant flow velocity of 0.63 ml/min and initial volume of PCE solution of 28.5 ml, produced CPNs with a minimum size of 329.12 nm. It was demonstrated that PCE polymers were either grafted on the surface or partially intercalated in the interlayer regions of C-S-H, and their introduction also increased the distance between C-S-H interlayers. Cement hydration was significantly promoted as a result of an increased heat release, even at low CPNs content. The early compressive strength of the mortar significantly improved with increasing CPNs content due to the accelerated cement hydration of the CPNs: the 0.6 wt.% CPNs content improved the compressive strength by 18.97%. Moreover, the inclusion of CPNs is advantageous for pore modification: the total porosity decreased by 25.77% after 3 days. Finally, phase composition analysis confirmed that no new crystalline phase was produced upon CPNs addition.
研究领域:
建筑材料科学
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化学工程
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产品关联
DOI
高影响因子
MACROMOLECULES
·
2016
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IF 5.554
Xu Li,Bolin Li,Xiaodong Zhang,Chengcheng Li,Zhirui Guo,Dongshan Zhou,Xiaolin Lu
Understanding the interfacial molecular structures of antifouling polymers in solutions is extremely important in research and applications related to chemistry, biology, and medicine. However, it is generally challenging to probe such buried solid/liquid interfaces in situ. We herein report a molecular-level study on detecting the interfacial molecular structures of an antifouling hydrogel material, poly(2-hydroxyethyl methacrylate) (PHEMA), in contact with water and bovine serum albumin (BSA) solution in situ using sum frequency generation (SFG) vibrational spectroscopy. To compare to and validate our in situ experiments, molecular-level structures of the substrate/PHEMA interface before and after water exposure were also detected. The detected strong O–H vibrational signals from water and hydroxyethyl and carbonyl vibrational signals from PHEMA prove that the PHEMA surface hydration was attributed to the interaction between water and PHEMA side hydrophilic groups. SFG experimental results verify that the adsorbed BSA molecules at the PHEMA/solution interface were disorderly arranged, supported by data from the laser scanning confocal microscopic (LSCM) experiment. This indicates the weak interaction between the BSA molecules and PHEMA surface. This direct detection of the surface hydrated structures of PHEMA sheds light on understanding the interfacial properties of antifouling materials in aqueous environments. The capability reported here to probe the PHEMA/solution interface and the hidden substrate/PHEMA interface after water exposure can be applied to investigate a broad range of interfaces of antifouling materials.
研究领域:
化学
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生物学
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医学
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产品关联
DOI
高影响因子
Journal of Building Engineering
·
2021
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IF 5.318
Ting Zhang,Baoguo Ma,Hongbo Tan,Huahui Qi,Tao Shi
Both sodium carbonate (NC) and sodium phosphate (NP) could immediately precipitate in the presence of calcium ions (Ca 2+ ), and these precipitates would deposit on the surface of cement as one layer in cement paste . However, these precipitates have different effects on the hydration of cement. In this study, effect of NC and NP on cement hydration was discussed, and the different effect between these two was investigated. Setting time, hydration heat, conductivity of cement suspension , and compressive strength of cement paste were examined, and the hydrates were analyzed with XRD and TG-DTG. The precipitates synthesized in saturated calcium hydroxide solution were characterized with XRD, TEM, and SEM. Then one model was proposed to illustrate the mechanism of the effect of NC and NP on cement hydration. The results indicated that NC accelerated cement hydration, but NP retarded it. And the results of TEM and SEM showed that calcium carbonate (the precipitate formed by NC and Ca 2+ )) could well crystalize with directional growth, there is a large amount of interspace in the calcium carbonate-based layer, which would benefit the transports of water molecules and dissolved ions. However, the calcium phosphate precipitate (the precipitate formed by NP and Ca 2+ )) seemed to have a large amount of amorphous structure with a much more compact layer structure than calcium carbonate. The difference in composition and structure of the layer was responsible for the effect of NC and NP on cement hydration. The mechanism behind accelerating effect of NC was due to the interspace in the calcium carbonate based layer which facilitated the ion dissolution of system, while that for retarding effect of NP was because the calcium phosphate-based layer formed on the surface of cement grains seemed compact enough to restrict the transports of water molecules and dissolved ions. Such consequences were expected to give deeper insight into the effect of the surficial structure of cement grains on early hydration of cement paste.
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2021
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IF 5.316
Sara Adeeba Ismail,Lulu Jiang,Peng Zhong,Truls Norby,Donglin Han
La 2 Ce 2 O 7 is known to be a disordered fluorite, i.e., 50% La-doped CeO 2 , exhibiting oxide ion conduction with contributions from protons in wet atmospheres and minority electrons under reducing conditions. Here, we report the effect of additional doping by partial substitution of La 3+ with divalent alkaline earth cations A 2+ ( A = Ca, Sr, Ba) on the hydration behavior and electrical conductivity of La 2 Ce 2 O 7 . A single-phase cubic fluorite structure was obtained for La 2 Ce 2 O 7 , (La 1- x Ca x ) 2 Ce 2 O 7-δ ( x = 0–0.3), (La 1- x Sr x ) 2 Ce 2 O 7-δ ( x = 0–0.2), and (La 1- x Ba x ) 2 Ce 2 O 7-δ ( x = 0–0.05). Substitution by A 2+ enhanced the degree of hydration, which may be attributed to increased concentration of hydratable oxygen vacancies and coordination of oxide ions by A 2+ in addition to La 3+ , while the basicity of the different A 2+ seemed unimportant. The doping increased ionic conductivity slightly, while the n-type electronic conductivity under reducing atmospheres increased considerably. XPS analyses indicated that the concentration and binding energy of Ce 3d electrons decreased with increasing doping level of Ca, implying an enhanced mobility of electrons which may be attributed to an observed decrease in lattice parameter .
研究领域:
材料科学
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电化学
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产品关联
DOI
高影响因子
ADVANCED MATERIALS
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2023
·Vol. 35
·期 16
·2210753
·
IF 29.4
Yong Qi,Liujun Song,Changtong Zhou,Shufen Zhang
Shape-memory photonic crystals (SMPCs) transform the nanoscale deformation of copolymers into structural color through an undifferentiated response to stimuli; however, activatable selective responses are extremely rare. Herein, activatable dual confined shape-memory effects (CSMEs) derived from the remodeling of the interchain hydrogen bonds (H-bonds) in cold-programmable SMPCs are revealed. The first level is the water-triggered reconstruction of interchain H-bonds, which can activate/lock the collapsed skeleton, showing shape recovery/retention in response to ethanol vapor. The second level is the pressure-induced reorganization of interchain H-bonds that results in the recovered skeleton being locked even when exposed to ethanol vapor or water, while the background porous structure can switch between collapse and recovery. Dual CSMEs result from the Laplace pressure difference and the binding effect of interchain H-bonds in the skeleton according to insights of swelling, in situ deformation tracking, multidimensional infrared spectra, and water wetting/evaporation simulations. The signal interference, source code extraction, and color enhancement of structurally colored patterns can be implemented using CSMEs. This work opens up a new method for fabricating activatable responsive structural color and contributes to the expansion of nanophotonic technology in water printing, erasable watermarks, signal amplifiers, and information coding.
研究领域:
材料科学
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纳米光学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Lumin Yang,Xiaoduo Zhao,Xiaozhu Liao,Rui Wang,Zengjie Fan,Shuanhong Ma,Feng Zhou
The lubrication deficiency in joints is a major cause of osteoarthritis. One of the most commonly used treatment means is to inject artificial lubricants, but there is a potential risk of infection during the injection process. Therefore, developing artificial lubricants with dual functions of friction-reduction and antibacterial is urgent. In this work, a novel polysaccharide-derived lubricant with simultaneous anti-bacteria and water-lubrication properties, called CS-MPC-N, is developed by grafting 2‑methacryloyloxylethyl phosphorylcholine (MPC) and nisin peptide onto backbone of chitosan (CS). Compared to the control CS, CS-MPC-N exhibits good lubrication and friction-reduction properties because of its excellent water solubility. Especially, CS-MPC-N shows low friction coefficient (0.03 ∼ 0.05) at the sliding interfaces of artificial joints materials or even natural articular cartilages. Moreover, CS-MPC-N can effectively inhibit the proliferation of Staphylococcus aureu, exhibiting excellent antibacterial effect. This kind of novel polysaccharide-derived lubricant is expected to be used in treating infectious arthritis.
研究领域:
材料科学
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生物医学工程
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药学
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骨科
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2022
·Vol. 147
·期 23
·13125-13134
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IF 4.755
Lu Xiaolei,Jia Jian,Ye Zhengmao,Du Peng,Chen Heng,Wu Jiaming,Cheng Xin
Nitrogenous strength enhancer is an organic chemical additive, which is popularly used to regulate cement hydration and improve cement properties. In this work, the effect of N, N-di(hydroxyethyl)glycine (bicine) on the hydration process and the properties of Portland cement were systematically investigated. The results obtained indicate that bicine significantly changes the morphology of portlandite crystals from a parallel-stacked lamellar shape to a distorted one and also decreases the pore size of the hardened cement paste at early age. The C–S–H phase in the hardened cement paste presents a higher Ca/Si ratio when adding bicine. Additionally, low doses of bicine can accelerate the hydration of C 3 A and C 3 S at lower dosage and promote the conversion of AFt to AFm. Thus, the mechanical performance would increase 30.9% and 13.6% at 3 d and 7 d only with 0.03% bicine, respectively. However, adding excessive bicine is not beneficial for the strength development in the early and late ages.
研究领域:
建筑材料学
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化学工程
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土木工程
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2023
·
IF 8.4
Fuying Zhu,Haochen Qiu,Fei Wang,Xing Zhang,Guo-Ping Lu,Yamei Lin,He Huang
CO2 conversion by stable, cost-effective carbonic anhydrase (CA)-like nanozymes emerges as an efficient and sustainable approach for CO2 fixation. In this work, a novel iron-based nanomaterial (Fe10@CN-Mg) was first reported to be a CA mimic, in which FeNx sites and Mg(OH)2 play a synergistically catalytic effect for CO2 conversion. Although this material has much lower metal content and cost, it has comparable kinetic constants (Km 6.37 mM and Vmax 30.74 mM/min) and a significantly higher CaCO3 formation rate (20.60 g·g–1·h–1, the quality of CaCO3 produced per hour per gram of the catalyst) than that of reported CA mimics. Fe10@CN-Mg is stable when processed at extreme pH, high temperature, organic solvents, and high ionic strength and also retains high activity after long storage times (two months) and seven cycles. In addition, Fe10@CN-Mg was successfully applied to convert CO2 into cyclic carbonates with high economic efficiency.
研究领域:
材料科学
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环境化学
·
催化
·
可持续能源
✓ 已验证
产品关联
DOI
高影响因子
Advanced Science
·
2025
·
IF 14.1
Xing Chen,Yifan Ma,Lingfei Zhao,Lingbin Che,Dianwen Song,Zihan Wu,Changsheng Liu,Yuan Yuan
Injectable bone cements are recognized as ideal solution for bone augmentation due to their minimally invasive introduction strategy. However, current clinical formulations and composites, while demonstrating improvements in certain areas, often fail to comprehensively address challenges, including rheological injectability, mechanical stability, interconnected porosity, degradability, and bioactivity. To overcome limitations, a novel bone cement comprising linear polyhydroxy PEGylated poly(glycerol sebacate) (L-PEGS) and calcium phosphate cement (CPC) is developed. The incorporation of L-PEGS enhances injectability and reinforces the mechanical weakness of CPC, resulting in improvement in compressive strength (increased by 16.7 folds) and fatigue resistance (1000 cycles). Owing to linear polyhydroxy backbone, L-PEGS initiates self-reinforcing cross-linking reaction synchronized with the hydration of CPC into hydroxyapatite. This hydration reinforcement is mediated by its abundant hydroxyl groups and high water absorption capacity, which accelerate hydration kinetics. Concurrently, the cross-linking reaction generates in situ carbon dioxide, resulting in porous microarchitecture that facilitates hydration process, enhances cement degradability, and promotes nutrient exchange and new bone ingrowth. In vitro and vivo studies confirmed that L-PEGS/CPC substantially enhances osteogenesis compared to clinical materials. Collectively, this injectable, hydration-driven, and self-reinforcing bone cement offers comprehensive solution to the challenges in current bone graft materials, holding promise for clinical bone repair.
研究领域:
生物医学工程
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生物材料
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组织工程
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骨科
·
再生医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Building Engineering
·
2025
·
IF 7.4
Yuyang Zhao,Xu Fang,Shunfan Guo,Xiangming Zhou,Binmeng Chen
Wet carbonation emerges as a pivotal technology for CO 2 sequestration and performance enhancement, wherein hydration and carbonation occur simultaneously and interactively. However, the mutual influence between these processes remains insufficiently understood. In our work, to maximize wet carbonation efficiency, CO 2 flow rate is set at 150 mL/min, which demonstrates the lowest residual alite (12.38 wt%) and high TG weight loss (34.57 wt%). Under identical CO 2 injection conditions, various durations for pre-hydration and wet carbonation duration are set to study the reaction dynamics of pre-hydrated alite under wet carbonation. During the pre-hydration stage, calcium hydroxide (CH) formed initially is preferentially carbonated, while C-S-H coatings on alite particles mitigates CO 2 penetration, slowing down alite carbonation and extending the pH plateau. As a result, pre-hydration stabilizes the system pH and delays alite dissolution, among which the unhydrated sample (Pre-H0) yields the highest reaction degree between 10 and 40 min of carbonation. In the wet carbonation stage, amorphous calcium carbonate (ACC) forms consistently which is stable at high pH and with dissolved silicate oligomer and converses to vaterite and calcite as carbonation time extends due to the decreased pH and polymerized silicates. In the post-hydration stage, residual alite continuously hydrates to stabilize ions concentration and pH of liquid phase. Solid-phase transformations include C-S-H formation via alite hydration and secondary hydration of CH with silica gel, alongside phase transitions among ACC, vaterite, and calcite.
研究领域:
材料科学
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水泥化学
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碳封存
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反应动力学
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矿物碳化
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产品关联
DOI
高影响因子
CRYSTENGCOMM
·
2012
·Vol. 14
·期 6
·1994-1997
·
IF 3.842
Pipi Wang,Guanjun Li,Yiping Chen,Shangwen Chen,Stuart L. James,Wenbing Yuan
Using a small planetary ball mill, liquid-assisted grinding (LAG) of metal salts or oxides (ZnO, CdO, CdCO3, Cu(OAc)2·H2O, Co(OAc)2·4H2O, Mn(OAc)2·4H2O, Ni(OAc)2·4H2O, FeSO4·7H2O) with two equivalents of isonicotinic acid (HINA) and small amounts of water (up to 5.6 molar equivalents) gave discrete aquo complexes trans-[M(INA)2(OH2)4] (M = Zn, Cd, Cu, Fe, Co, Ni, Mn) efficiently within 30 min. For M = Zn, Cd and Cu these complexes readily undergo reversible formal dehydration to the extended network structures [M(INA)2] (M = Zn, Cu) or [Cd(INA)2(OH2)]·DMF by further LAG with non-aqueous liquids such as methanol or DMF. Overall, the mechanochemical dehydrations are more effective than heating or immersion in bulk solvents. The work demonstrates a two-step mechanochemical synthesis of coordination networks via discrete aquo complexes which may be preferable to single step reactions or grinding-annealing procedures in some cases. For example, the two step method was the only way to prepare [Cd(INA)2(OH2)]·DMF mechanochemically and the porous network Cu(INA)2 could not be obtained from the aquo complex by heating.
研究领域:
化学
·
材料科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）