JOURNAL OF CRYSTAL GROWTH
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2014
·
IF 1.693
Huanyong Li,Zhi Gu,Haiyang Zhang,Wenwei Li
A modified chemical vapor transport system is developed to grow ZnSe single crystals from zinc–selenium source materials, where iodine serves as the chemical transport agent to avoid the kinetics limitations of the congruent sublimation conditions. ZnSe crystals with different crystalline quality are obtained under various growth conditions. The thermodynamic properties of Zn-Se-I 2 system are studied by combining the mass conservation with the vapor-solid reactions related to crystal growth. The mass transport is analyzed by using the diffusion-convection mathematical model. Depending on initial iodine concentration and the designed temperature difference between source zone and growth zone, the optimum growth conditions can be predicted based on the calculated maximum growth rate. Comparing growth results with theoretical analysis indicates that Zn-Se-I 2 system affords a feasible route to grow ZnSe crystals. High quality ZnSe crystal can be achieved under the theoretically optimized growth conditions.
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Materials Research Express
·
2014
·Vol. 1
·期 1
·015033
·
IF 0
Yanyan Chen,Shenjie Li,Lijian Huang,Daocheng Pan
Au+ ions have been successfully incorporated into the lattice of ZnxCd1−xS quantum dots as luminescent centers via an aqueous method. The dopant emission can be tuned in the range of 445 to 570 nm, and the highest quantum yield can reach as high as 30%. Our results showed that Au+ ions can be used as an excellent luminescent dopant in doped quantum dots. Finally, these water-soluble quantum dots can be used directly in PL imaging of HepG2 cells without conjugating any biological targets, indicating a high potential application in bio-labeling.
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ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Meng He,Xiaoyi Chen,Kui Cheng,Wenjian Weng,Huiming Wang
The topography at the micro-/nanoscale level and bioactive composition of material surfaces have been thought to play vital roles in their interactions with cells. However, it is still a challenge to further modify special topography with biodegradable composition or vice versa. In this study, TiO2 nanorod films covered with microscale-distributed Zn-containing calcium phosphate (Zn-CaP) were prepared, trying to create a micro-/nanoscale topography and Zn2+ release capability. MC3T3-E1 cells cultured on TiO2 nanorod film with sparsely distributed Zn-CaP (TiO2/S-ZCP) had significantly higher biological responses than those on the films with densely distributed Zn-CaP (TiO2/D-ZCP) and fully covered Zn-CaP (F-ZCP). TiO2/S-ZCP film was demonstrated to facilitate osteogenic differentiation much more strongly than F-ZCP and TiO2/D-ZCP films based on evaluations of ALP, related gene expressions, and extracellular matrix mineralization. The higher osteogenic differentiation on TiO2/S-ZCP film is ascribed to the micro-/nanoscale topography from Zn-CaP coverage promoting cell adhesion and filopodia extension, and inducing differentiation-orientation in the initial stage. And consequently Zn2+ release results in enhancement of differentiation. Therefore, we believe that better organization of the micro-/nanotopography and bioactive ion release on the surface would be a promising way to enhance osteogenic activity for orthopedic and dental implants.
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SURFACE & COATINGS TECHNOLOGY
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2016
·
IF 2.139
Qiuhua Yuan,Jianbo Wu,Caoping Qin,Anping Xu,Ziqiang Zhang,Songxin Lin,Xiangzhong Ren,Peixin Zhang
Zn-doped hydroxyapatite/polylactic acid (HA/PLA) composite coatings fabricated by spin-coating technique have rarely been studied by other researchers in recent years. In this study, Zn-doped hydroxyapatite (Zn-doped HA) powder were synthesized by chemical precipitation method, and then Zn-doped hydroxyapatite/polylactic acid (Zn-doped HA/PLA) composite coatings were coated on stainless steel substrates using a spin-coating technique for the first time. The effects of heat treatment in air at 600 °C on the composition and morphology of Zn-doped HA/PLA composite coatings with a series of molar ratios of zinc (0 mol%, 5 mol%, 10 mol%, 15 mol% and 20 mol%) were studied. The obtained samples were characterized by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). The results showed that Zn 2 + ions had replaced the partial Ca 2 + ions and were doped into hydroxyapatite lattice successfully. The synthetic hydroxyapatite nanoparticles showed rod-like morphology, whereas the substitution of the Zn ions restrained the growth of Zn-doped HA crystal and decreased its size. The surface morphology of Zn-doped HA/PLA composite coatings after sintering at 600 °C for 1 h exhibited a uniform, porous structure with a thickness of 60 μm or so. The introduction of PLA in composite coatings could keep metal substrates from catalyzing the decomposition of HA caused by high temperature heat treatment.
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WATER AIR AND SOIL POLLUTION
·
2016
·Vol. 227
·期 10
·1-8
·
IF 1.551
Li Ying,Yang Lijiao,Chen Cheng,Lan Yeqing
In this paper, Zn(0)-catalyzed ozonation degradation of acid orange 7 (AO7) and its impact factors including solution pH, Zn loading, and AO7 initial concentration were investigated through a series of bath experiments. The results demonstrated that Zn could markedly accelerate the degradation of AO7 by ozone (O 3 ) and the degradation efficiency of AO7 increased by 77 and 71 % within 30 min as compared with those in the systems of O 3 alone and Zn/air, respectively. The reuse of Zn resulted in a slight decline in AO7 degradation, suggesting that a coating of ZnO on the surface of Zn particles weakened Zn catalytic activity. The optimal removal of AO7 was achieved in a wide pH range of 4 to 10, and a lower or higher pH was not conducive to the degradation of AO7. In addition, the degradation efficiency of AO7 increased with Zn loading but decreased with AO7 initial concentration. The introduction of free radical scavengers into the system of AO7/Zn/O 3 confirmed that O 2
•− , rather than •OH, was the main free radicals responsible for the rapid removal of AO7. The degradation of AO7 by O 3 assisted with Zn could be well expressed with pseudo-first-order kinetic model.
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MOLECULES
·
2017
·Vol. 22
·期 2
·305
·
IF 2.861
Jingwei Rui,Fei Liu,Rijie Wang,Yanfei Lu,Xiaoxia Yang
A series of Zn-modified NaY zeolites were prepared by the liquid-phase ion-exchange method with different Zn sources, including Zn(NO3)2, Zn(Ac)2and ZnSO4. The samples were tested as adsorbents for removing an organic sulfur compound from a model gasoline fuel containing 1000 ppmw sulfur. Zn(Ac)2-Y exhibited the best performance for the desulfurization of gasoline at ambient conditions. Combined with the adsorbents’ characterization results, the higher adsorption capacity of Zn(Ac)2-Y is associated with a higher ion-exchange degree. Further, the results demonstrated that the addition of 5 wt % toluene or 1-hexene to the diluted thiophene (TP) solution in cyclohexane caused a large decrease in the removal of TP from the model gasoline fuel. This provides evidence about the competition through the π-complexation between TP and toluene for adsorption on the active sites. The acid-catalyzed alkylation by 1-hexene of TP and the generated complex mixture of bulky alkylthiophenes would adsorb on the surface active sites of the adsorbent and block the pores. The regenerated Zn(Ac)2-Y adsorbent afforded 84.42% and 66.10% of the initial adsorption capacity after the first two regeneration cycles.Keywords:Zeolite;Zinc sources;adsorption;desulfurization;ion exchange
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FOOD CHEMISTRY
·
2025
·
IF 9.8
Yangjing Li,Wei Tian,Tao Chen,Yanfei Li,Runan Zhao,Yuxin Li,Xuesong Chi,Di Wu,Yinan Du,Jiangning Hu
Mitigating food spoilage from microbial infections remains a critical challenge in food preservation. Although Zn 2+ ions are used as chemical bactericides, their use alone often requires high doses. A novel nanomaterial, Zn@MNPs, combining photothermal properties with the controlled release of Zn 2+ , was synthesized through a coordination of Zn 2+ with melanin nanoparticles (MNPs) derived from cuttlefish ink. Zn@MNPs were capable of attaching onto the bacterial surfaces, enabling high-efficiency release of Zn 2+ under mildly acidic conditions typically associated with bacterial infections. This leads to sustained antibacterial activity, causing bacterial membrane rupture and leakage of intracellular components. Incorporating Zn@MNPs into polyvinyl alcohol (PVA)-based films improved their ability to block UV light and reduce oxygen and water vapor permeability. These films effectively reduced dehydration, preserved nutritional content, and extended fruit shelf life. This study highlights the potential of Zn@MNPs-based PVA films as biodegradable, bioactive packaging materials for enhancing food preservation and safety.
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ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Xiaoquan Han,Tianqi Li,Jianxun Zhao,Shang Gao,Jing Zhao,Wanqiang Liu
Despite the recent resurgence of rechargeable aqueous zinc batteries (RAZBs), challenges persist for Zn metal anodes, including dendrite growth and corrosion in mild aqueous electrolytes during cycling. Developing a simple and effective solution is crucial. This study introduces a one-step strategy to create a protective layer at room temperature comprising the superconductor Nb3Sn and embedded Zn foil. The Nb3Sn–Zn composite, with a high Zn2+ transfer number and uniform nucleation sites, exhibits excellent zinc affinity and synergistic effects. This composite effectively inhibits dendrite growth by controlling Zn nucleation and prevents Zn corrosion and hydrogen evolution by shielding the Zn metal surface from electrolyte attack. The Nb3Sn–Zn composite shows remarkable electrochemical properties, including a low voltage hysteresis, high Coulombic efficiency, and prolonged cycling stability. Furthermore, a full cell utilizing the Nb3Sn–Zn anode and MnO2 cathode demonstrates superior rate capability and cycle life stability. The present research introduces an innovative methodology for the design of dendrite-free Zn anodes suitable for practical applications.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 2
·1286-1296
·
IF 2.599
Cao Sheng,Zheng Jinju,Dai Chencheng,Wang Lin,Li Chengming,Yang Weiyou,Shang Minghui
In this report, doping concentration-dependent photoluminescence (PL) properties of Mn-doped ternary Zn–In–S quantum dots (QDs) were studied by using steady-state and time-resolved PL spectroscopy. The QDs PL was firstly significantly intensified with the increasing Mn doping concentration and then decreased after the doping concentration increased up to 7.5 at.%. However, their decay lifetimes exhibit a monotone decrease with Mn doping concentration ranged from 0 to 10 at.%. It can be concluded that the PL intensity was mainly determined by two factors: one was the increased efficiency of energy transfer from host excitons to Mn 2+ ion accepter, and the other was the decreased efficiency of the emission from a Mn 2+ ion, which was caused by the increased component of exposed Mn 2+ ions on QDs surface and the accelerated interaction between adjacent dopants. The competition of above two exciton relaxation dynamics processes determined the trend of the PL intensity, while the latter was responsible for the monotonously decreased lifetime of the Mn 2+ ion emission with the increasing Mn doping concentration.
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JOURNAL OF POWER SOURCES
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2017
·
IF 6.395
Li-Yuan Zhang,Meng-Ran Wang,Yan-Qing Lai,Xiao-Yan Li
N-doped microporous carbon as an exceptional metal-free catalyst from waste biomass ( banana peel as representative ) was obtained via fast catalysis carbonization , followed by N-doping modification. The method achieves a relatively high C conversion efficiency of ∼41.9%. The final carbon materials are doped by N (∼3 at.%) and possess high surface area (∼1097 m 2 g −1 ) and abundant micropores . Compared to commercial Pt/C materials, the as-prepared carbon catalyst exhibits a comparable electrocatalytic activity and much better stability. Furthermore, the metal-free catalyst loaded Zn-air battery possesses higher discharge voltage and power density as compared with that of commercial Pt/C. This novel technique can also be readily applied to produce metal-free carbon catalysts from other typical waste biomass (e.g., orange peel, leaves) as the carbon sources. The method can be developed as a potentially general and effective industrial route to transform waste biomass into high value-added microporous carbon with superior functionalities.
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ACS Applied Energy Materials
·
2024
·
IF 5.4
Huan Tu,Xiaogang Li,Yanhui Zhou,Zongnan Wang,Rui Wu,Hu Zhou,Chunfeng Meng,Yutao Xue,Iltaf Khan,Aihua Yuan
Aqueous zinc-metal batteries are regarded as the most promising energy conversion and storage devices in the near future because of high volume energy density, low cost, and extreme safety. However, the practical industrialization of zinc-metal batteries is still facing the challenges of poor Zn anode reversibility, such as Zn dendrite propagation, interface corrosion, and hydrogen evolution reaction. Here, we report an optimized Zn2+ solvation structure composite electrolyte modified by trimethyl phosphate (TMP) additive, which can suppress the rough growth of Zn dendrites, the formation of H2, the corrosion of zinc, and the formation of passivation layer. Because TMP has a higher Gutmann donor number than H2O, the higher electron cloud density of O atoms in TMP enhances the strength of hydrogen bonds with H2O. Resultantly, the coordination environment of Zn2+ with H2O is broken instead of reconstructed Zn2+ solvation structure with moderate TMP additive. The electrochemical reversibility of the Zn anode is enhanced in the optimized electrolyte with TMP. Consequently, the cycling stability of Zn plating/stripping is promoted by 15% TMP modified electrolyte with high CE of 99.22% at 1 mA cm–2, stably cycled for 850 cycles compared with short-term lifespan less than 200 cycles in the blank electrolyte. The Zn||Zn symmetrical cells can sustain dendrite-free for more than 3000 h with overpotentials of 0.1 V. In addition, the Zn||V2O5 full cell can contribute an unexceptionable long-term cycling stability for over 1000 cycles even at 1 A g–1 with the reversible capacity retention of 66 mA h g–1. This work proposes a facile strategy to regulate the metal-ion solvation structure in aqueous metal batteries.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Peng Liu,Yeping Liu,Zhexu Gai,Fei Yang,Yanzhao Yang
Despite significant progress in nanozyme research and the advancement of analytical techniques, the inherent lack of specificity for target analytes often limits their utility in analysis. Integrating specific recognition capabilities into inorganic nanomaterials, independent of biological catalysts or adaptors, represents a crucial breakthrough in the field. Detecting Sarcosine (Sar) in human urine has recently emerged as a non-invasive biomarker for prostate cancer (PCa), presenting a valuable diagnostic tool. This study introduces a novel method for embedding molecular imprinting sites directly onto the surface of a Zn/Ce-based zeolitic imidazolate framework (Zn/Ce-ZIF) nanozyme, facilitating the development of a highly specific colorimetric assay for precise Sar measurement. By utilizing the lanthanide metal cerium as the catalytic element and ZIF-8 as the structural scaffold, we synthesized spherical Zn/Ce-ZIF nanozymes with exceptional oxidase-like catalytic efficiency. The efficiency of molecular imprinting experiments and the ability of molecularly imprinted polymers (MIPs) to identify target molecules were significantly enhanced by using theortical calculations to screen suitable functional monomers. The molecularly imprinted nanozyme (Zn/Ce-ZIF@MIP) initiates a colorimetric oxidation reaction of 3,3′,5,5′-tetramethylbenzidine (TMB), wherein the presence of Sar facilitates selective recognition and capture by the MIP shell, modulating the colorimetric response by hindering TMB’s access to the catalytic site. An intelligent color extraction detection device has been developed for the rapid perception of Sar. This colorimetric sensing platform has been validated through the detection of Sar in simulated urine samples. Overall, the application of surface molecular imprinting enhances the functionality of nanozymes in analytical fields.
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