JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2019
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IF 4.029
Changzhi Yin,Ying Tang,Junqi Chen,Feihu Li,Yijun Huang,Chunchun Li,Xianran Xing,Liang Fang
Two melilite ceramics Sr 2 AGe 2 O 7 (A = Mg, Zn) with low permittivity were prepared by a solid-state reaction method. The crystal structure and microstructure of the ceramics were characterized by X-ray diffraction, transmission electron microscopy , Raman spectroscopy , and scanning electron microscopy. Both ceramics crystallized in a single melilite structure with a tetragonal space group P-42 m (113) and exhibited homogeneous microstructures. Optimum microwave dielectric properties with relative permittivity ( ε r ) of 8.56, quality factor ( Q × f ) of 28,800 GHz, and temperature coefficient of resonance frequency ( τ f ) of −70.5 ppm/°C were obtained in Sr 2 MgGe 2 O 7 sintered at 1330 °C. Sr 2 ZnGe 2 O 7 possessed ε r of 8.81, Q × f of 35,700 GHz, and τ f of −84.4 ppm/°C when sintered at 1290 °C. Thermal stability of resonance frequency was accessible when the negative τ f values of Sr 2 AGe 2 O 7 were adjusted after the formation of composite ceramics with CaTiO 3 .
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JOURNAL OF MOLECULAR LIQUIDS
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2019
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IF 4.561
Hengxin Fang,Zhixu Tang,Xinjuan Liu,Yongli Huang,Chang Q. Sun
It has been a long pursuit to discriminate the ionic roles of mono- and di-valent salt solutions in modulating the hydrogen bonding network and solution properties. We attended this issue by examining the effect of concentrated YX 2 (Y Mg, Ca, Sr; X Cl, Br) solvation on O:H O bonds transition from the mode of ordinary water to hydration in terms of the number fraction f YX2 ( C ) and the segmental O:H O bond phonon stiffness shift Δω(C) with C being the solute concentration. The invariant df Y ( C ) / dC at C ≤ <0.05 suggests that the small Y 2+ forms a constantly-sized hydration droplet with weak responding to interference of other ions because its hydrating H 2 O dipoles screen mostly its electric field. However, the number inadequacy of the highly-ordered hydrating H 2 O dipoles partially screens the large X − . The X − ↔ X − electrostatic repulsion weakens its electric field. The concentration-trend consistency of the f YX2 ( C ), the solution conductivity σ YX2 ( C ), and surface stress (contact angle) θ YX2 ( C ) for YX 2 solutions clarifies their common origin of ionic polarization. However, the Jones–Dale notion disobedience of the viscosity η YX2 ( C ) suggests the dominance of the inter-ion repulsion.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
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2018
·Vol. 48
·期 10
·1131-1138
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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
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Frontiers in Chemistry
·
2018
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IF 4.155
Li Yinong,Tian Chen,Liu Weizhen,Xu Si,Xu Yunyun,Cui Rongxin,Lin Zhang
Nano-Mg(OH)2 is attracting great attention as adsorbent for pre-concentration and recovery of rare earth elements (REEs) from low-concentration solution, due to its superior removal efficiency for REEs and environmental friendliness. However, the nanoparticles also cause some severe problems during application, including aggregation, blockage in fixed-bed column, as well as the difficulties in separation and reuse. Herein, in order to avoid the mentioned problems, a carbon cloth (CC) supported nano-Mg(OH)2 (nano-Mg(OH)2@CC) was synthesized by electrodeposition. The X-ray diffraction and scanning electron microscopy analysis demonstrated that the interlaced nano-sheet of Mg(OH)2 grew firmly and uniformly on the surface of carbon cloth fibers. Batch adsorption experiments of Eu(III) indicated that the nano-Mg(OH)2@CC composite maintained the excellent adsorption performance of nano-Mg(OH)2 toward Eu(III). After adsorption, the Eu containing composite was calcined under nitrogen atmosphere. The content of Eu2O3 in the calcined material was as high as 99.66%. Fixed-bed column experiments indicated that no blockage for Mg(OH)2@CC composite was observed during the treatment, while the complete blockage of occurred to nano-Mg(OH)2 at an effluent volume of 240 mL. Moreover, the removal efficiency of Mg(OH)2@CC was still higher than 90% until 4,200 mL of effluent volume. This work provides a promising method for feasible application of nanoadsorbents in fixed-bed process to recycle low-concentration REEs from wastewater.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
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2024
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IF 13.3
Muhammad Mubeen,Jingmao Zhao,Mohammad Tabish,Jingbao Wang,Mubashar Mahmood,Hassan Murtaza,Muhammad Jawad,Baomin Fan,Ghulam Yasin
Dual threats of over-film (degradation) and under-film filiform corrosion (FFC) pose a significant challenge to the reliable application of Zn-Al-Mg coated steel (ZAM-steel), necessitating the development of effective protection strategies. This study introduces a novel MRS@GO nanohybrid, integrated within epoxy (EP) coatings, to enhance the corrosion resistance of ZAM-steel in 3.5 wt% NaCl solution. The hierarchical structure of MRS@GO synergistically combines the barrier properties of an insulating material (MRS) with the electrochemical benefits of a conducting material (GO), providing superior protection. This dual functionality significantly improves the overall performance and durability of ZAM-steel, making it a promising candidate as the decorative coating for the automotive industry.
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PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Han-Bing Chen,Lan-Yue Cui,Wan-Nian Liu,Shu-Chang Zhang,Yu Wang,Shuo-Qi Li,Cheng-Bao Liu,Rong-Chang Zeng
Biomedical magnesium (Mg) alloys have attracted widespread attention because of their excellent biocompatibility and biodegradability as bone implants. However, the rapid rate of corrosion in the human environment and post-surgical bacterial infections have limited their clinical applications. It is a good way to prepare drug-loaded composite coatings on the surface of Mg alloys via esterification reaction, but the effects of molecules chain length on coating formation, degradation, drug loading and release behaviors are not really clear. Herein, mannitol (MAN) and polyvinyl alcohol (PVA) loaded with levofloxacin (Lvf) were selected to prepare corrosion-resistant and anti-bacterial coatings on micro-arc oxidation (MAO) coated AZ31 alloys. The results suggested that the composite coatings exhibited optimized corrosion resistance, superior antibacterial activity and outstanding biocompatibility. The drug released from both composite coatings was exceeded the minimum inhibitory concentration (MIC) of Lvf (0.5 μg/mL). Compared to MAN, PVA with longer molecular chains had better drug loading capacity and release rate, which ascribed to the mainly hydrogen-bond interaction between PVA and Lvf, except for esterification reaction. The porosity, pore diameter and roughness of MAO coating were decreased with the addition of MAN or PVA, promoting the adhesion and growth of the osteoblasts. The results provided a new insight into drug-controlled release coatings on Mg alloys as bone implants against bacterial infections.
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DESALINATION
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2024
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IF 8.3
Xi Gao,Yan Wang,Xiaomeng Liu,Rongzi Zhang,Haidong Sun,Panpan Yin,Yongxing Huo,Rongping Yun,Xu Xiang
The development of granular adsorbents with high adsorption capability and high cycle stability is of great significance for the application in efficiently extracting lithium from salt lake brine. Herein, the structure of granular aluminum-based adsorbents was regulated by adding water-soluble polymer PEG. The results showed that the molecular weight of PEG was closely related to the pore structure and surface hydrophilicity of the granular adsorbents. With the decrease of the molecular weight of PEG, the specific surface area, the average surface pore size, and the hydrophilicity of granular adsorbents increase. The optimized adsorbent PSF-PEG600@AD formed a complex pore structure with surface macropores and internal mesopores as well as excellent hydrophilicity. The mechanical strength and wear resistance are enhanced. This unique porous structure and surface hydrophilicity enable PSF-PEG600@AD rapid adsorption equilibrium in the old brine of Qarhan salt lake with a Mg/Li ratio of 323 within 4 h. The adsorption capacity remains as high as 99.02 % after 10 static adsorption-desorption cycles, showing excellent cyclic stability. This study guides a direction in preparing high-performance granular adsorbents with adjustable pore structure and surface properties.
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Materials Today Nano
·
2024
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IF 8.2
Asim Arshad,Brundha Chidambaram,Abdullah Nasir,Tianxiang Yang,Menglong Sun,Nosheen Zafar,Sining Yun
Constructing multicomponent electrocatalysts towards efficient energy conversion is widely adopted strategy, in this regard, high performance metal/nonmetal codoped carbon electrode materials have attained great consideration. Still, the electroacatalytic susceptibility, abundant intrinsic active sites, and stable electrochemical performance in different electrolytes are considered as underline challenges, which can be addressed by rational structural modifications to build a hybrid electroactive material. In this work, unique Sn based multicomponent carbon nanospheres are firstly developed as highly efficient bi-functional electrocatalysts in solar cells and hydrogen evolution. The designed electrocatalysts feature the combined effect of dispersed bimetal active sites and sufficient nitrogen components within spherical carbon framework, which readily enhanced the charge transfer rate via multiple channels, boosting the triiodide reduction reaction (IRR) and hydrogen evolution reaction (HER). As a result, solar cell with Mn/Sn-NC based counter electrodes (CEs) exhibited an excellent power conversion efficiency (PCE) of 8.39 %, outperforming Pt (7.67 %). Moreover, superior HER kinetics are also demonstrated by Mn/Sn-NC with a small overpotential of 127.8 mV at 10 mA cm −2 and tafel slope of 77 mV dec −1 . The rational design of the carbon nanospheres with MnSn 2 bimetal nanoparticles and N doping promotes a high electrochemically active surface area, low charge-transfer resistance, excellent electrochemical stability, and superior electrocatalytic activity, providing a promising route to construct highly efficient materials towards multiple energy conversion applications.
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Journal of Materials Chemistry B
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2018
·Vol. 6
·期 6
·966-978
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IF 4.776
Pei Wang,Pan Xiong,Jing Liu,Shuang Gao,Tingfei Xi,Yan Cheng
Magnesium (Mg) alloys have been intensively investigated as potential absorbable coronary stent materials as their use avoids risks such as late inflammation and restenosis generated by permanent metallic implants. Besides that, clinical trials on coronary stents fabricated from Mg alloys have made great progress recently. However, the over-rapid corrosion rate, magnesium corrosion-induced thrombosis formation and delayed endothelium regeneration continue to be problematic for coronary artery stent therapy. In this study, silk fibroin blended with heparin and GREDVY (Gly-Arg-Glu-Asp-Val-Tyr) peptide was immobilized on a HF-pretreated MgZnYNd alloy surface via a polydopamine layer to improve its corrosion resistance, blood compatibility and endothelialization. Standard electrochemical measurements along with the long-term immersion results indicated that the functionalized MgZnYNd alloy had preferable anti-corrosion abilities compared with the bare MgZnYNd alloy. The modified surface exhibited outstanding hemocompatibility with reduced platelet adhesion, hemolysis rate and prolonged blood coagulation time. Human umbilical vein endothelial cell (HUVEC) and vascular smooth muscle cell (VSMC) co-culture results revealed more attached HUVECs on the functionalized samples than on the MgZnYNd alloy surfaces. The excellent corrosion retardation, hemocompatibility and re-endothelialization of the multi-functional coating indicate a promising method in the field of biodegradable magnesium-based implantable cardiovascular stents.
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Catalysis Science & Technology
·
2025
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IF 4.2
Dajian Li,Alfin Kurniawan,Tania Roy,Jin Wang,Cheng lan Liu,Ze Zhen Wang,Rong Zhen Mu,Chun Hui Zhou
The efficient production of allyl alcohol from glycerol is of great importance due to its significance as a valuable intermediate in chemical industries. While catalytic conversion of glycerol to allyl alcohol by solid acid catalysts, carbon deposition (coking) is prone to occur on the catalyst surface, leading to slow down the conversion process and fast deactivation of the catalyst. In this study, we obtained an efficient catalyst for the preparation of allyl alcohol from gas-phase glycerol by controlling the pore structure and surface acidity of the catalyst. The characterization results showed that hydrochloric acid and citric acid removed the silicon and aluminium elements from montmorillonite, and the acidity, pore volume, and surface area ratio of Na-MMT (SBET=34.5 m2 g-1, VT=0.19 cm3 g-1) of the porous montmorillonite(HA1MMT) catalyst were all improved (SBET=97.9 m2 g-1, VT=0.28 cm3 g-1); After adding MoOx and VOx, the selectivity of Mo/V-HA1MMT catalyst for allyl alcohol was improved. The XPS characterization results indicate that the synergistic effect of Mo and V can promote the transfer of electrons during the reaction process of glycerol conversion. Within 480 minutes of catalyzing glycerol dehydration reaction, Mo0.6V0.4(5)-HA1MMT was almost deactivated (Conv.= 19.5%, Sel.allyl alcohol=31.2%) due to carbon deposition. When the catalyst was doped with calcium and magnesium components, a new active phase CaMo4 was discovered on the catalyst, and the acidity of Ca0.5Mg0.5-Cat. (Cat. is Mo0.6V0.4(5)-HA1MMT) decreased to 214.0 μmol g-1. The coking resistance performance of Ca0.5Mg0.5-Cat. was improved, and after 660 minutes of reaction, the catalyst was deactivated (Conv.= 32.1%, Sel.allyl alcohol=30.1%) due to carbon deposition. During the 3rd catalyst regeneration test, Ca0.5Mg0.5-Cat. still maintained high activity (Conv.= 63.3%, Sel.allyl alcohol=35.2%, Sel.acrolein=31.2%). The results of this study indicate that suitable pore structure and acidity are crucial for designing a catalyst with coking resistance properties.
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MICROCHEMICAL JOURNAL
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2024
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IF 4.9
Wenrong Cai,Yanjing Shi,Datong Wu,Junyao Li,Laidi Xu,Yong Kong
This work proposes a novel dual-signal electrochemiluminescence ( ECL) immunosensor based on energy resonance transfer (RET) for the detection of β2-Microglobulin (β2-MG). Introducing carbon vacancy into g-C 3 N 4 (V C -g-C 3 N 4 ) can lead to the narrowing of the band gap and the reduction of LUMO, thereby significantly enhancing the ECL efficiency of the material. Meanwhile, Zr-MOF can effectively load Ru(bpy) 3 2+ (Ru-Zr-MOF), enabling its stable existence on the electrode. The ECL emission spectrum of V C -g-C 3 N 4 overlaps well with the fluorescence excitation spectrum of Ru-Zr-MOF, indicating an effective ECL-RET effect between them. As the concentration of β2-MG increases, the intensity of anodic ECL signal gradually increases, while the intensity of cathodic ECL signal gradually decreases. The difference between the cathodic and anodic ECL signals has a good linear relationship within the concentration range from 0.2 pg/mL to 200 ng/mL, with a detection limit of 27.73 fg/mL. The constructed immunosensor can be used for practical analysis in human serum. The proposed sensor has great potential in clinical detection of β2-MG, providing new insights for biomolecular detection and disease diagnosis.
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LANGMUIR
·
2025
·
IF 3.9
Xiaoming Yu,Meiling Zhang
This study introduces a robust, self-healing superhydrophobic coating for magnesium (Mg) substrates, leveraging the synergistic effects of MQ organosilicon polymer, octadecylamine (ODA), polydopamine (PDA), and copper-loaded graphene oxide (GO). The coating exhibits exceptional superhydrophobicity, outstanding stability in harsh environments, superior resistance to smudging, and effective self-cleaning capabilities. Electrochemical impedance spectroscopy (EIS) in 3.5 wt % NaCl solution demonstrates an impedance modulus (|Z|) at f = 0.01 Hz and polarization resistance (Rp) of 3.49 × 108 Ω cm2 and 3.88 × 108 Ω cm2, respectively, 7 orders of magnitude higher than AZ31B. After 35 days of immersion, |Z|f=0.01 Hz and Rp remain at 3.97 × 107 Ω cm2 and 4.63 × 107 Ω cm2, respectively, highlighting long-term corrosion protection. In cases of damage or corrosion, the dynamic coordination of PDA-Cu2+ enables self-healing, fully recovering visible coating defect up to 10 μm in width within 24 h in 3.5 wt % NaCl solution. This work presents a promising approach for durable, self-healing superhydrophobic coatings with exceptional mechanical and chemical stability.
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