JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2019
·Vol. 140
·期 4
·1725-1735
·
IF 2.471
Qian Yecheng,Zhang Yue,Sun Jinhe,Song Chao,Jing Yan,Shao Fei,Jia Yongzhong,Tao Zhengyuan,Wang Xingquan,Liu Hong
Magnesium chloride hexahydrate, as a phase change materials, is investigated usually to store solar energy. Here, the effect of hydrophilic modification of expanded graphite with Triton X-100 on the thermophysical properties of magnesium chloride hexahydrate was presented. Differential scanning calorimetry, scanning electron microscope, Fourier transform infrared spectroscopy and thermal gravimetric analysis, etc., were used. The magnesium chloride hexahydrate/hydrophilic expanded graphite composite phase change materials had more excellent thermal characteristics than magnesium chloride hexahydrate/expanded graphite composite phase change materials and pure magnesium chloride hexahydrate. The results showed that hydrophilic expanded graphite could better promote the endothermic and exothermic properties of magnesium chloride hexahydrate. After hydrophilic modification, the composites with higher melting enthalpy, better thermal conductivity and less supercooling were obtained. And the leakage test demonstrated that the hydrophilic modification of expanded graphite can reduce the leakage of magnesium chloride hexahydrate powerfully.
研究领域:
材料科学
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能源工程
✓ 已验证
产品关联
DOI
高影响因子
AUSTRALIAN JOURNAL OF CHEMISTRY
·
2018
·Vol. 71
·期 6
·416-421
·
IF 1.059
Ouyang Dong,Zhihong Zhang,Zhenhai Fu,Xiang Li
A new phase-change material (PCM) CaCl2·6H2O + MgCl2·6H2O + NH4Cl was investigated in this paper. MgCl2·6H2O and NH4Cl were mixed with CaCl2·6H2O to obtain CaCl2·6H2O as a eutectic hydrate salt. The results show that the eutectic composition of the PCM is as follows: 90 wt- % CaCl2·6H2O, 6.25 wt- % MgCl2·6H2O and 3.75 wt- % NH4Cl; the undercooling degree is less than 1.5°C when the nucleating agent is 2 wt- % SrCl2·6H2O or 1.5 wt- % Ba(OH)2·8H2O. The phase-change temperature and latent heat are respectively 25.3°C and 144.3 J g−1 when the composition is 90 wt- % CaCl2·6H2O, 6.25 wt- % MgCl2·6H2O, 3.75 wt- %, NH4Cl, with 2 wt- % SrCl2·6H2O as nucleating agent, and 2 wt- % carboxymethyl cellulose as thickener. In addition, when the composition is changed to 90 wt- % CaCl2·6H2O, 6.25 wt- % MgCl2·6H2O, 3.75 wt- % NH4Cl, 1.5 wt- % Ba(OH)2·8H2O and 2 wt- % carboxymethyl cellulose, the phase change temperature and latent heat are 25.2°C and 139.3 J g−1, respectively.
研究领域:
材料科学
·
热能存储
·
化学工程
✓ 已验证
DOI
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2022
·
IF 7.693
Xingang Xu,Chang Shu,Lu Yang,Xin Li,Fazhou Wang
This study brings a novel magnesium oxychloride cement-based photocatalytic material. Basic magnesium chloride whisker (BMCW) was modified by nano-SiO 2 to improve the loading capacity of TiO 2 photocatalyst. Then, TiO 2 was supported in BMCW/SiO 2 to form the basic magnesium chloride whisker photocatalytic materials (BMCWPM). The effects of pH values and TiO 2 supporting concentrations on physio-chemical properties and photocatalytic performance were investigated in detail. As TiO 2 hydrosol pH value is about 7.55, the loaded BMCWPM has the best degradation efficiency on gaseous toluene. BMCWPM synthesized with 5 % TiO 2 supporting concentration shows the best photocatalytic efficiency of unit TiO 2 , also shows an excellent photocatalytic cyclic stability, the photocatalytic degradation efficiency and reaction rate of gaseous toluene are exceeding 55 % and 22.7*10 −7 mol/m 2 min, respectively. This study provides a kind of photocatalytic material with high efficiency and durability, which is expected to apply in wall decoration materials for air purification.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING & TECHNOLOGY
·
2025
·Vol. 48
·期 9
·e70109
·
IF 1.6
Pengfei Yao,Guangpin Lin,Yi Su,Li Shu,Yingpin Wen,Fengli Yang
The isomerization of glucose catalyzed by attapulgite (ATP) modified by MgCl 2 was investigated. The catalytic performance of ATP on glucose isomerization was significantly enhanced after MgCl 2 modification (Mg-ATP), achieving a fructose yield of 36.5 % and a selectivity of 90.2 % in an aqueous system at 120 °C for 1 h. Combined with the characterization results, it could be concluded that the microstructure of ATP has been changed after MgCl 2 modification, leading to an increase in surface area and the number of weak basic sites, which are beneficial for the glucose isomerization reaction.
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DOI
高影响因子
JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2018
·Vol. 48
·期 10
·1131-1138
·
IF 2.262
Ling Ziye,Li Suimin,Zhang Zhengguo,Fang Xiaoming,Gao Xuenong,Xu Tao
Abstract Household water heating systems incorporating phase change materials (PCMs) can store solar thermal energy and reduce energy consumption. MgCl 2 ·6H 2 O–Mg(NO 3 ) 2 ·6H 2 O eutectics have a melting point near 60 °C with a large energy storage density suitable for use in the thermal energy storage unit of a water heating system. However, the low thermal conductivity of the eutectic limits its heat extraction rate. In this study, we combine the eutectic and expanded graphite (EG) to prepare a high thermal conductivity composite PCM and study its cycling performance over 200 thermal cycles. The thermal conductivity of the composite PCM increased from 0.5 to 3.7 W m −1 K −1 , ensuring faster heating and cooling. The images obtained from scanning electron microscopy and leakage testing showed that the maximum loading mass fraction of the eutectic in the EG reached 85 wt %. Infrared spectra and X-ray diffractometry patterns confirm that composites with compositions between those of EG and the eutectic were composed of the physical mixture. Thermogravimetric analysis indicated that the composite PCM lost less mass at 300 °C compared to the pure eutectic, and differential scanning calorimetry demonstrated that the composite PCM had a melting point of 52.3 °C and a small subcooling degree of 2.7 °C, compared to 56.6 and 18.4 °C for the pure eutectic, respectively. All these measurements demonstrated that the composite PCMs changed less after 200 thermal cycles than the pure eutectic, which had an observable stratification caused by phase separation. The composite PCM developed was thermally conductive, shape-stabilized, and more thermally stable during cycling than the pure eutectic. Graphical Abstract
研究领域:
能源材料
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
SOLAR ENERGY MATERIALS AND SOLAR CELLS
·
2017
·
IF 4.784
Ziye Ling,Junwan Liu,Qianhao Wang,Wenzhu Lin,Xiaoming Fang,Zhengguo Zhang
MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectic has a proper melting point and high latent heat for solar water heating systems with latent heat storage . In this paper, the exact composition of the eutectic and the corresponding phase change temperature are determined by measuring the phase change characteristics of mixtures of MgCl 2 ·6H 2 O and Mg(NO 3 ) 2 ·6H 2 O in various ratios. MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectics, the melting temperature of which is around 58 °C, can be obtained with the mass fraction of MgCl 2 ·6H 2 O ranging from 35% to 50%. The eutectics are composited with porous fumed silica to improve its thermo-physical properties. The eutectic/SiO 2 composite retains a similar melting point of the pure eutectic, is of no liquid leakage even after melting while the SiO 2 weighs more than 15 wt%, and the specific enthalpy reaches 88.13 kJ kg −1 . The eutectic/SiO 2 composite has a thermal conductivity 5% higher than pure eutectics and better thermal stability and cycle stability. The thermogravimetric analysis shows its weight loss is 8.03% less than pure eutectic at 300 °C. And the eutectics suffers a decrease in phase change enthalpy after 100 thermal cycles by 9.2%, much lower compared with the 37.23% for pure eutectics due to the phase separation during the thermal cycles. Thermo-physical properties and stability of MgCl 2 ·6H 2 O-Mg(NO 3 ) 2 ·6H 2 O eutectic have been enhanced by fumed silica.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
高影响因子
Materialia
·
2023
·
IF 3.4
Dzi Shing Aaron Lau,Herng Ee Chieng,Chenmin Wang,Zhaoyang Li,Xiaoting Zhang,Dick Ho Kiu Chow,Ling Qin,William Weijia Lu
Calcium sulfate/phosphate cement (CSPC) is a calcium-based bioactive material which is degradable and used to repair bone defects, however, it is not recommended for patients with poor bone health due to the mismatch of time of bone regeneration and cement degradation. Previous studies suggested the addition of Magnesium (Mg) is a possible solution to enhance the performance of CSPC as Mg ions are beneficial to osteogenesis. However, the impact on bone healing induced by Mg is subtle since Mg 2+ ions regulate both osteoblastic and osteoclastic activities. This study examined the healing effect of pure Mg-enriched CSPC (Mg-CSPC) and magnesium chloride (MgCl 2 ) enriched CSPC (MC-CSPC). Mg-CSPC showed sustained release of Mg 2+ whereas MC-CSPC exhibited spike release of Mg 2+ and led to a higher rate of degradation. In vivo study in ovariectomized (OVX) rat model indicated a longer time of degradation in Mg-CSPC, which fully degraded at postoperative week 8. Mg-CSPC contained interconnective pores which allowed cell migration from the outer layers to the core of the cement and improved osteoinduction. On the other hand, MC-CSPC was fully degraded in less than 4 weeks after surgery and replaced by newly formed bone. In this study, MC-CSPC demonstrated a significantly higher rate of bone regeneration than Mg-CSPC and the optimum rate of bone regeneration was between weeks 4 to 7 after cementoplasty. Both histological and quantitative micro-CT analysis suggested MC-CSPC produced a higher quality of new bones and positively affected the surrounding bones. Taken together, this study suggests a fast release of Mg-contained scaffold is preferable for bone repair and the healing effect is continued even after complete degradation.
研究领域:
生物医学工程
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材料科学
·
骨科
✓ 已验证
DOI
高影响因子
BIOMACROMOLECULES
·
2024
·
IF 5.5
Tianmeng Kang,Zhaoyuan Guo,Yao Lu,Ju’e Cun,Wenxia Gao,Yuji Pu,Bin He
The healing of infected wounds is challenging for patients. In this paper, a hybrid hydrogel with strong tissue adhesion, self-healing, and antibiosis without antibiotics was developed as a dressing to promote the healing of infected chronic wounds. Acrylamide (PAM) was polymerized with N,N-methylene bis(acrylamide) (BIS) as the substrate, and self-assembled nanoparticles of carboxymethyl chitosan and chlorin e6 (CMCS/Ce6 NPs) trapped with magnesium (Mg2+) ions were dispersed in the hydrogel substrate. CMCS/Ce6 NPs provided favorable photodynamic antibiosis via the production of reactive oxygen species (ROS) under NIR irradiation. The hybrid hydrogels exhibited excellent self-healing properties, diverse adhesion, and biocompatibility. The in vivo results indicated that the hybrid hydrogel accelerated wound healing significantly via comprehensive factors of photodynamic antibiosis of CMCS/Ce6 NPs, cell proliferation promotion by Mg2+, good bioadhesion, and moisture retention of the PAM hydrogel, which promoted collagen deposition and blood vessel maturation.
研究领域:
生物医学工程
·
材料科学
·
创伤修复
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Chemistry-X
·
2022
·
IF 6.443
Xinyu Yang,Ru Zhao,Mengxia Wei,Huiyan Gu,Jialei Li,Lei Yang,Tingting Liu
An improved method denoted as salting out-solvent-free microwave rotary distillation (SOSFMRD) was successfully developed for the extraction of essential oils from fresh magnolia ( Oyama sieboldii ) leaves, in which we achieved the rotation of the reaction material by means of a rotating motor to subject the material to uniform microwave irradiation. Magnesium chloride was selected as the salting-out agent through a comparative study on the salting-out effects of different anions and cations of metal salts. The variables of SOSFMRD were systematically optimized. Under the obtained optimization conditions, the essential oil yield was 21.68 ± 1.02 mL/kgDW. Gas chromatography–mass spectrometry analysis showed that the main chemical constituent of O. sieboldii essential oil was dehydrocostuslactone, the content of which reached 30.23 ± 1.27 %. Compared with the other conventional methods, this method has a high yield and low energy consumption, which can effectively reduce impact on the environment.
研究领域:
化学工程
·
植物化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2022
·
IF 7.139
Xiaoxue Sun,Qinghua Wang,Shenghan Wu,Xinyu Zhao,Ligang Wei,Kunlan Li,Jingai Hao,Li Wei,Shangru Zhai,Qingda An
Ammonia is considered as a promising hydrogen or energy carrier. Ammonia absorption or adsorption is an important aspect for both ammonia removal, storage and separation applications. To these ends, a wide range of solid and liquid sorbents have been investigated. Among these, the deep eutectic solvent (DES) is emerging as a promising class of ammonia absorbers. Herein, we report a novel type of DES, i.e. , metal-containing DESs for ammonia absorption. Specifically, the NH 3 absorption capacity is enhanced by ca. 18.1–36.9% when a small amount of metal chlorides , such as MgCl 2 , MnCl 2 etc. , are added into a DES composed of resorcinol (Res) and ethylene glycol (EG). To our knowledge, the MgCl 2 /Res/EG (0.1:1:2) DES outperforms most of the reported DESs. The excellent NH 3 absorption performances of metal–containing DESs have been attributed to the synergy of Lewis acid–base and hydrogen bonding interactions. Additionally, good reversibility and high NH 3 /CO 2 selectivity are achieved over the MgCl 2 /Res/EG (0.1:1:2) DES, which enables it to be a potential NH 3 absorber for further investigations.
研究领域:
化学工程
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材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Qiuyan Bi,Shiai Xu
A positively charged PI/PDA/PEI nanofiltration membrane was prepared in this study by crosslinking between polyethyleneimine (PEI) and poly(dopamine) (PDA) on the polyimide (PI) support membrane for separating Mg 2+ and Li + from MgCl 2 /LiCl mixed solution, and its chemical structure, surface properties, and separation performance were investigated. The results indicate that the PI/PDA/PEI membrane has a thin positively charged layer and shows excellent rejections against many inorganic salts [MgCl 2 (93.1%) > MgSO 4 (86.5%) > Na 2 SO 4 (74.7%) > LiCl (37.6%)]. More importantly, the membrane exhibits long-term stability and good separation of Mg 2+ and Li + , and the Mg/Li ratio of the permeate of brine obtained from West Taijnar salt lake can be reduced from 65.3 to 5.0 at pH 6.5 by filtration.
研究领域:
膜科学
·
分离技术
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纳滤技术
·
离子分离
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表面改性
·
材料科学
✓ 已验证
DOI
高影响因子
Journal of Environmental Sciences
·
2018
·
IF 3.12
Yanjun Zhang,Changwei Zhao,Shaofeng Zhang,Ling Yu,Jiding Li,Li-an Hou
The lack of fresh water in the world makes the search for an effective method to decontaminate water an urgent priority. An important step is to remove different multivalent ions in salt treatment. Nanofiltration (NF) has been used for treating water containing different kinds of salts. In this work, sulfonate group-modified graphene oxide (SGO) was prepared, and added during the interfacial polymerization (IP) reaction to prepare SGO-modifiedNF membranes (PA-SGO). The chemical composition, structure and surface properties of PA and PA-SGO membranes were characterized by FT-IR, XPS, SEM, AFM, contact angle and zeta potential measurements. Their water flux , salt rejection and anti-fouling abilities were investigated systematically. The testing results showed that the water flux of PA-SGO (0.03% SGO) was 45.85 LMH under a pressure of 0.2 MPa, and the salt rejection varied in the order of Na 2 SO 4 (98.99%) > MgSO 4 (91.25%) > MgCl 2 (42.27%) > NaCl (21.96%). An anti-fouling experiment indicated that the PA-SGO membrane had good anti-fouling properties because of its decreased roughness and increased hydrophilicity and electronegativity. The PA-SGO membrane has good potential for use in removing salt ions from water.
研究领域:
环境科学
·
材料科学
·
水处理
✓ 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）