CONSTRUCTION AND BUILDING MATERIALS
·
2023
·
IF 7.4
Runzhuo Cao,Junfen Yang,Guoxin Li,Qun Zhou,Mengdie Niu
Exposure of cement-based structures to sulfuric acid environments can cause significant degradation. Therefore, this study focuses on the effect of nano-SiO 2 on the sulfuric acid resistance of ordinary Portland cement (OPC)-sulfoaluminate cement (SAC) composites (as repair material). Samples were exposed to three concentrations of acid solution. The degradation kinetics, chemistry, and microstructures of the composites were analyzed. The results of degradation kinetics (dimensional change, mass and strength loss) showed that the nano-SiO 2 modified composites had a lower degradation rate compared to the composites without nano-SiO 2 . XRD, TG, MIP and SEM analyses demonstrate that nano-SiO 2 promoted hydration and improved structural compactness, which can not only enhance the diffusion resistance of composites to H + and SO 4 2- , but also form a protective barrier in acid environments. However, diffusion–dissolution-precipitation is still the main mode of degradation in composites subjected to sulfuric acid attack, regardless of nano-SiO 2 content mixed into the composite system.
研究领域:
材料科学
·
土木工程
✓ 已验证
产品关联
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2020
·
IF 4.419
Guoxin Li,Qingfeng Liu,Mengdie Niu,Li Cao,Bing Nan,Chen Shi
Nanosilica (NS) with ultra-fine structure and high pozzolanic activity frequently used to reinforce cement-based materials. In this study, NS was selected to modify CSA-OPC blends to meet the critical engineering properties of rapid repair materials, such as fast setting hardening, high early strength and sustainable late strength. The effects of NS on the setting time, mechanical strength, phase and mass change of hydrates and pore structure of binary blends were investigated. Results indicated that NS largely shortens the setting time. The remarkable enhancement in the early strength compared to other substitution levels by adding 1.0wt. %NS, and the sustainable late strength was maintained. XRD and TG-DTA demonstrate that ettringite was the main hydrate and its content evidently increase with the inclusion of NS. Furthermore, SEM micrographs was observed that NS effectively improves the binding between the hydrates. The utilization of NS resulted in less porosity and more homogeneous binary mortar as seen in MIP test.
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Cheng-Han Lee,Pin-Han Chen,Wei-Sheng Chen
Boron has a high applied value from the past to now. It can be used in composite material, aerospace industry, semiconductor industry, and many other areas. Nonetheless, boron resources are only located in some countries, so it is strenuous to acquire. To obtain more boron and reach the goal of resources circulation, boron was recovered from the desalination brine through Amberlite IRA 743 resin in this study. Because extreme climate change makes people have insufficient freshwater, desalination technology has matured since the 20th century. Although it can cope with freshwater scarcity, the by-product, brine, is detrimental to the environment. The only merit of brine is that it is a concentrated solution, so the boron concentration in brine is higher than in some ores. This recovering system then uses the characteristics of brine to get boron. The research could be divided into three parts. First, the adsorption isotherm model was investigated, and the saturated adsorption capacity of boron through Amberlite IRA 743 resin was 74.34 mg/g and conformed to the Langmuir model. The second part surveyed the optimal parameters of boron adsorption through Amberlite IRA 743 resin. The results revealed that 18.9 mg/L of boron could be fully adsorbed from brine under pH 10, L/S ratio of 200, contacting period of 128 min, and temperature at 328 K. On the other hand, different agents would be tested to desorb the boron from the resin, and the boron product could be generated. In a nutshell, through this research, people can reduce the side effect of brine and circulate boron resources in an eco-friendly method.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Mofan Li,Donghai Yang,Shiyi Lv,Xinming Zhao,Jianwei Wang,Minmin Xia,Limin He
Electric field-based synchronous coupling with magnetic fields has shown great potential in enhancing the efficiency of electric dehydration for crude oil. However, the mechanisms underlying electric-magnetic coupling and its influence on droplet coalescence are not yet entirely understood. This study aims to investigate the coalescence dynamics of salt-laden water droplets in oil under an electric-magnetic coupling field. Experimental investigations using high-speed cameras and simulations employing electrohydrodynamic/molecular dynamic methods were conducted to elucidate differences in critical coalescence conditions. The results revealed a significantly higher critical electric field strength required for droplet coalescence under the influence of an electric-magnetic coupling field compared to a single electric field. This behavior can be attributed to changes in the migration direction and aggregation region of ions caused by the electric-magnetic coupling effect. Consequently, the charge at the end of droplets decreases, and the weight of the electric field force competes with the capillary force, thereby hindering coalescence. Furthermore, the study revealed that at an ion concentration of 1000 mg·L −1 , the critical electric field strength exhibited a maximum enhancement rate of 18.2 %. This enhancement can be attributed to the combined effect of ionic migration, which becomes more pronounced at higher concentrations, and the influence on the polarization of water molecules. However, when the electric field frequency was increased to 500 Hz, the migration of ions was shortened, resulting in a significantly reduced enhancement rate of only 0.909 %. Finally, the mathematical relationships between the coupled magnetic field reinforced critical electric field strength for different control parameters were determined by fitting the data points. In summary, this study provides novel scientific insights into the deep dehydration of crude oil by investigating the effects of electric-magnetic coupling on droplet coalescence. The findings present valuable guidance for optimizing the efficiency of dehydration processes and ensuring the safe and stable production in oil industrial applications.
研究领域:
石油工程
·
电动力学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Mofan Li,Donghai Yang,Lei Tian,Haotian Liu,Liangyu Cai,Limin He
Combining a magnetic field with an electric field offers a promising approach for enhancing oil–water separation, yet its underlying mechanisms are not fully understood. We systematically investigated the dynamic deformation of salt-containing water droplet suspended in oil under an electric–magnetic coupling field. Integrating high-speed camera experiments with molecular dynamics simulations, we found that the dynamic response amplitude of droplet is reduced compared to a single electric field. Our analysis suggests that ions deflect under electric–magnetic coupling, affecting ion enrichment and water molecule polarization, thereby weakening droplet tip charge and induced electric forces, which suppresses droplet deformation. Increasing the electric capillary number and ion concentration enhances suppression, whereas improving the electric field frequency to 500 Hz almost eliminates this suppression effect. Notably, the degree of droplet deformation inhibition remains consistent across different viscosity ratios. These research findings offer insights for designing dehydrators to intensify oil–water separation.
研究领域:
物理学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Green Energy & Environment
·
2022
·
IF 12.781
Guolang Zhou,Linlin Chen,Xiaowei Li,Guiling Luo,Zhendong Yu,Jingzhou Yin,Lei Fan,Yanhong Chao,Lei Jiang,Wenshuai Zhu
The extraction of lithium from salt lakes or seawater has attracted worldwide attention because of the explosive growth of global demand for lithium products. The LiMn 2 O 4 -based electrochemical lithium recovery system is one of the strongest candidates for commercial application due to its high inserted capacity and low energy consumption. However, the surface orientation of LiMn 2 O 4 that facilitates Li diffusion happens to be prone to manganese dissolution making it a great challenge to obtain high lithium inserted capacity and long life simultaneously. Herein, we address this problem by designing a truncated octahedral LiMn 2 O 4 (Tr-oh LMO) in which the dominant (111) facets minimize Mn dissolution while a small portion of (100) facets facilitate the Li diffusion. Thus, this Tr-oh LMO-based electrochemical lithium recovery system shows excellent Li recovery performance with high inserted capacity (20.25 mg g −1 per cycle) in simulated brine. In addition, the dissolution rate of manganese per 30 cycles is only 0.44% and the capacity maintained 85% of the initial after 30 cycles. These promising findings accelerate the practical application of LiMn 2 O 4 in electrochemical lithium recovery.
研究领域:
材料科学
·
电化学工程
✓ 已验证
产品关联
DOI
高影响因子
Gels
·
2023
·Vol. 9
·期 10
·805
·
IF 4.6
Fengbao Liu,Jinsheng Sun,Xianbin Huang,Yuan Geng
Currently, conventional polymeric filtrate reducers with high-temperature resistance for use in drilling fluids have high molecular weights, which greatly affects the rheological properties. Therefore, to address the challenges in regulating the rheology and filtration performance of high-density drilling fluids at high temperatures, it is essential to develop low-molecular-weight filtrate reducers with high-temperature resistance. In this study, a low-molecular-weight filtrate reducer with high-temperature resistance (LMF) was prepared via free radical polymerization from acrylamide and 2-acrylamido-2-methyl-1-propanesulfonic acid as monomers, tertiary dodecyl mercaptan as a chain transfer agent, and ammonium persulfate as the initiator. LMF was then characterized by infrared spectroscopy, thermogravimetric analysis, and gel permeation chromatography. The obtained filtrate reducer exhibits a weight-average molecular weight (Mw) of 3819 and an initial thermal decomposition temperature of 300.7 °C, indicating good thermal stability. The effects of LMF dosage, temperature, and NaCl dosage on the rheology and filtration performance of mud samples were also investigated, and the mechanism of action was revealed by zeta potential, particle size distribution, scanning electron microscopy, and adsorption measurements. The results reveal that LMF increases the mud sample viscosity and reduces its filtration. For example, the filtration of the mud sample with 2 wt% LMF was 7.2 mL, a reduction of 70% compared to that of a blank mud sample. Further, after aging at 210 °C for 16 h, the filtration of the same sample was 11.6 mL, and that of a mud sample with 2 wt% LMF and 35 wt% NaCl after aging at 180 °C for 16 h was 22 mL. Overall, we have reported a scheme to prepare a low-molecular-weight filtrate reducer with high-temperature resistance and superior filtrate-reducing effects, laying the foundation for the investigation and development of low-molecular-weight filtrate reducers.Keywords:low molecular weight;high-temperature resistance;salinity tolerance;filtrate reducer
研究领域:
石油工程
·
材料科学
·
化学工程
✓ 已验证
DOI
PubMed
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Cheng-Han Lee,Wei-Sheng Chen,Jun-Yi Wu
Cesium can be widely used in many industries now. However, the primary reservoir of cesium is often located in high mountains and deserts, so it is challenging to obtain cesium resources. To solve this problem, cesium was recovered from waste desalination brine through Dowex G26 resin in this study. Due to the lack of water resources, desalination technology was developed since the 20th century. Nevertheless, its by-product, brine, is harmful to the environment. To reduce the threat of waste brine, this experiment aims to provide a simple procedure to recover cesium resources from brine. The study could be divided into three parts. First, the adsorption isotherms and the thermodynamics parameters such as enthalpy, entropy, and Gibbs free energy of cesium adsorption were investigated. In the second part, the batch experiments would explore the optimal adsorptive period, pH value, and liquid-solid ratio (L/S ratio) of cesium adsorption through Dowex G26 resin. The results showed that the adsorption of cesium fit with the Langmuir model, and the reaction was spontaneous. On the other hand, cesium could be recovered efficiently under the conditions of 4 min of contacting time, pH 9, and L/S ratio of 1,000. After adsorbing, the cesium could be desorbed through nitric acid, and solid cesium nitrate would be obtained by drying the desorbed solutions. In the end, the Dowex G26 system would be compared with the t-BAMBP/kerosene system and t-BAMBP/C 2 mimNTf 2 system to demonstrate its advantages and drawbacks.
研究领域:
环境科学
·
化学工程
·
材料科学
·
资源回收技术
·
吸附技术
✓ 已验证
DOI
高影响因子
Regenerative Biomaterials
·
2024
·
IF 5.6
Xie Lijun,Zhang Yan,Cao Binji,Jiao Xiaoyi,Yue Xusong,Xu Yan,Yang Xianyan,Yang Guojing,Wang Yingjie,Shen Jian,Wang Cong,Weng Xisheng,Gou Zhongru
It is known that magnesium phosphate cements (MPCs) show appreciable mechanical strength and biocompatibility, but the hydration reaction processes often lead to intense heat release while the hydration products present weak resistance to mechanical decay and low bioactivity. Herein we developed an MPC-based system, which was low-heat-releasing and fast-curing in this study, by compounding with self-curing calcium silicate cements (CSCs). The MPC composed of magnesium oxide (MgO), potassium dihydrogen phosphate (KH2PO4), disodium hydrogen phosphate (Na2HPO4), magnesium hydrogen phosphate trihydrate (MgHPO4·3H2O) and chitosan were weakly basic, which would be more stable in vivo. The physicochemical properties indicated that the addition of CSCs could increase the final setting time while decrease the heat release. Meanwhile, the CSCs could endow MPC substrate with apatite re-mineralization reactivity, especially, which add 25 wt.% CSCs showed the most significant apatite deposition. What’s more, the mechanical evolution in buffer demonstrated CSCs could enhance and sustain the mechanical strength during degradation, and the internal constructs of cement implants could still be reconstructed by μCT analysis in rabbit femoral bone defect model in vivo. Particularly, appropriate CSCs adjusted the biodegradation and promoted new bone tissue regeneration in vivo. Totally, the MPC/CSCs composite system endows bioactivity and sustain mechanical strength of the MPC, which may be promising for expending the clinical applications of MPC-based bone cements.
研究领域:
材料科学
·
生物材料
·
生物医学工程
·
骨科
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Results in Engineering
·
2024
·
IF 6
Thi Thi Mar,Yunlong Xue,Yu Chang,Zijian Yu,Zhongxiao Du,Bing Cao,Rui Zhang
Pervaporation emerges as a promising technique for brine treatment. In this investigation, we employed a PVDF substrate layer and applied various coating solutions using a simple spray technique to produce a composite pervaporation membrane. The composite membrane's chemical structure, morphology, hydrophilicity, swelling property, surface roughness, and crosslinking conditions were thoroughly investigated. Notably, the PVDF/PEI/P(SS-MA) composite membrane exhibited outstanding desalination performance, demonstrating high salt rejection and flux of 308.7 ± 13.8 kg m −2 h −1 when subjected to a 3.5 wt% sodium chloride solution. Even at an elevated brine concentration of 20 wt%, the membrane maintained a commendable flux of 88.76 ± 5.4 kg m −2 h −1 at 72 °C. These findings underscore the efficacy of the developed composite membrane for brine desalination applications.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Foods
·
2022
·Vol. 12
·期 1
·101
·
IF 5.561
Shiyao Zhang,Yue Xiao,Yongli Jiang,Tao Wang,Shengbao Cai,Xiaosong Hu,Junjie Yi
The effects of (fresh/aged) brine and (pool/jar) containers on the flavor characteristics of pickled chili peppers were investigated based on a multivariate analysis integrated with kinetics modeling. The results showed that the effect of brine on organic acid, sugar, and aroma was more dominant than that of containers, while free amino acids production was more affected by containers than brines. Chili pepper fermented using aged brine exhibited higher acidity (3.71–3.92) and sugar (7.92–8.51 mg/g) than that using fresh brine (respective 3.79–3.96; 6.50–9.25 mg/g). Besides, chili peppers fermented using pool containers showed higher free amino acids content (424.74–478.82 mg/100 g) than using a jar (128.77–242.90 mg/100 g), particularly with aged brine. As for aroma, the number of volatiles in aged brine was higher (88–96) than that in fresh brine (76–80). The contents of the esters, alcohols, and ketones were significantly higher in the aged brine samples than those in fresh brine (p< 0.05), while terpenes in chili pepper fermented using the pool were higher than those using the jar. In general, jar fermentation with aged brine contributed more flavor to pickled chili peppers than other procedures.Keywords:fermented chili pepper;flavor;brines;containers;multivariate data analysis
研究领域:
食品科学
·
微生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Polymers
·
2020
·Vol. 12
·期 4
·955
·
IF 3.426
Hongzhong Tan,Jincheng Mao,Wenlong Zhang,Bo Yang,Xiaojiang Yang,Yang Zhang,Chong Lin,Jianfa Feng,Hao Zhang
Three kinds of drag reducer were synthesized by inverse emulsion polymerization and named PHWAM-1, PHWAM-2, and PHWAM-3. Drag reduction (DR) tests showed that the three drag reducers have different DR characteristics in fresh water and various saline waters because of their different types of hydrophobic monomers. PHWAM-1, without hydrophobic monomers, performs better in fresh water, while PHWAM-2 and PHWAM-3, with hydrophobic monomers, perform better in brine. In addition, PHWAM-3, which has twin-tailed hydrophobic monomers, performs best in high-concentration brine. Measurements of micro-particle size and observations of spatial structure suggest that although the stronger hydrophobic polymer has no DR advantage over a linear polymer in fresh water, the molecular chains form a mutually associative supporting structure that improves the DR performance over that of a linear polymer in high-concentration brine.Keywords:hydrophobic associating polymer;drag reducer;salt tolerance
研究领域:
化学工程
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）