JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2024
·
IF 5.8
Yongqiang Zhang,Zhiwei Zhou,Bingchu Mei
The high optical quality Nd 3+ doped asymmetrical (Ca x Sr 1-x ) 5 (PO 4 ) 3 F transparent ceramics were successfully fabricated using the hot-pressing method. The phase composition, in-line optical transmittance, microstructure and fluorescence properties were discussed. The findings revealed that the Ca 2+ and Sr 2+ were dissolved in Sr 5 (PO 4 ) 3 F crystal cell instead of forming a new heterophase structure. The prepared ceramics exhibited an in-line transmittance of 75 % at 1μm and 55 % at 600 nm, demonstrating high transparency rather than translucency. The emission intensity and FWHM of neodymium doped ceramic samples can be significantly enhanced through co-doping with Ca 2+ and Sr 2+ . Furthermore, by adjusting the Ca/Sr ratio, these samples can achieve controllable emission light within the wavelength range between neodymium doped FAP and S-FAP emissions. The fluorescence lifetime was obviously improved compared with Nd: FAP and slightly reduced compared with Nd: S-FAP. Moreover, the fluorescence lifetime trend varies in accordance with the alteration of lattice constant.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2014
·
IF 2.726
Yi Cao,Baoping Lin,Ying Sun,Hong Yang,Xueqin Zhang
La x Sr 1 − x Co 0.1 Mn 0.9 O 3 − δ (0.3 ⩽ x ⩽ 1) perovskite nanofibers (LNF- x ) are firstly prepared by a simple electrospinning method. The microstructure, morphology and electrochemical properties of La x Sr 1 − x Co 0.1 Mn 0.9 O 3 − δ (0.3 ⩽ x ⩽ 1) are systematically studied through scanning electron microscopy (SEM), X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer–Emmett–Teller (BET) surface area measurements and electrochemical analyzer etc. The results show that the nanofibers maintain the fibrous structure with perovskite phase after annealed at 700 °C. And with the increase of Sr content in La x Sr 1 − x Co 0.1 Mn 0.9 O 3 − δ (0.3 ⩽ x ⩽ 1), the diameter range of the samples tend to decrease and the roughness of surface enlarge as well. Furthermore, when 1 M KOH electrolyte is employed, a maximum capacitance of 485 F g −1 at a current density of 1 A g −1 is achieved for the LNF-0.7 as electrode material.
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
CHEMISTRY OF MATERIALS
·
2020
·
IF 9.567
Dongjie Liu,Xiaohan Yun,Peipei Dang,Hongzhou Lian,Mengmeng Shang,Guogang Li,Jun Lin
Recently, there has been growing interest in developing Bi3+-activated luminescence materials for optoelectronic applications. Herein, new yellow/orange-emitting ABZn2Ga2O7:Bi3+ (ABZGO, A = Ca, Sr; B = Ba, Sr) phosphors with tunable optical properties are synthesized by an alkaline earth cation substitution. When Sr2+ substitutes Ca2+ and Ba2+, the excitation wavelength has a red shift from 325 to 363 nm, matching well with the n-UV chip based white light-emitting diodes (WLEDs). CaBaZn2Ga2O7:0.01Bi3+ (CBZGO:0.01Bi3+) exhibits two evident emission peaks at 570 and 393 nm originating from the respective occupation of Ca and Ba sites by Bi3+ ions. The optical tuning of the CBZGO:Bi3+ phosphor is achieved by changing the Bi3+ doping content and excitation wavelength based on the selected site occupation. Differently, both SrBaZn2Ga2O7:0.01Bi3+ (SBZGO:0.01Bi3+) and Sr2Zn2Ga2O7:0.01Bi3+ (SZGO:0.01Bi3+) phosphors exhibit a single broad emission band, peaking at 600 and 577 nm, respectively. Two different Bi3+ sites are also verified respectively in SBZGO and SZGO hosts by the Gaussian fitting of the asymmetric PL spectra and lifetime analysis. The different luminescence behaviors of ABZGO:0.01Bi3+ phosphors should be ascribed to the synergistic effect of the centroid shift, crystal-field splitting, and Stokes shift. Moreover, the temperature-dependent PL spectra reveal that cation substitutions of Sr2+ for Ca2+ and Ba2+ can efficiently improve the thermal stability of ABZGO:0.01Bi3+ phosphors. In view of different thermal responses to various temperatures for two emission peaks of the CBZGO:0.01Bi3+ phosphor, an optical thermometer is designed and has a good relative sensitivity (Sr = 1.453% K–1) at 298 K. Finally, a WLED with CRI = 97.9 and CCT = 3932 K is obtained by combining SZGO:0.01Bi3+ and BAM:Eu2+ phosphors with a 370 nm n-UV chip, demonstrating that SZGO:0.01Bi3+ is an excellent yellow-orange-emitting phosphor for n-UV WLED devices. This work stimulates the exploration of optical tuning by cation substitution to obtain remarkable luminescence materials for optical temperature sensing and WLED applications.
研究领域:
材料科学
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光电子学
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发光与荧光粉
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固态照明
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温度传感
✓ 已验证
DOI
高影响因子
Nature Communications
·
2020
·Vol. 11
·期 1
·1-7
·
IF 12.121
Liu Xu,Xu Wen Wu,Huang Xinyu,Wang Endong,Cai Xiao,Zhao Yue,Li Jin,Xiao Min,Zhang Chunfeng,Gao Yi,Ding Weiping,Zhu Yan
The discovery of atomically precise nanoclusters is generally unpredictable, and the rational synthesis of nanoclusters guided by the theoretical design is still in its infancy. Here we present a de novo design of Au 36 (SR) 24 nanoclusters, from theoretical prediction to experimental synthesis and characterization of their physicochemical properties. The crystal structure of an Au 36 (SR) 24 nanocluster perfectly matches the simulated structural pattern with Au 4 tetrahedral units along a two-dimensional growth. The Au 36 (SR) 24 nanocluster indeed differs from its structural isomer whose kernel is dissected in an Au 4 tetrahedral manner along a one-dimensional growth. The structural isomerism in the Au 36 (SR) 24 nanoclusters further induces distinct differences in ultrafast electron dynamics and chirality. This work will not only promote the atomically precise synthesis of nanoclusters enlightened by theoretical science, but also open up exciting opportunities for underpinning the widespread applications of structural isomers with atomic precision.
研究领域:
纳米材料科学
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物理化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sensor Review
·
2025
·
IF 1.4
Zhaopeng Li,Pei Li,Peisi Yin,Xin Zhao,Yangting Hu,Fei Sun,Xia Sun,Zhenhe Wang
Purpose This paper aims to develop a highly sensitive resistive gas sensor for accurately detecting ethyl formate to achieve reliable and real-time monitoring of fish meal spoilage. Design/methodology/approach Based on the one-step solvothermal reduction method, in a specific triethylene glycol solution environment and high temperature, the 3D ZnO sensing material with a jackfruit-like structure was prepared for detecting ethyl formate gas in fish meal. Findings The gas sensor based on 3D ZnO displays high sensor response (69.68–100 ppm) at 280°C and 43% RH and good sensor response (12.18–100 ppm) at 280°C and 80% RH, ultra-low detection limit of 10 ppb at 43% RH, excellent selectivity, repeatability and long-term stability. The sensing mechanism is due to the gain or loss of electrons caused by the sensor surface reaction. The unique jackfruit-like structure, abundant oxygen vacancies and large surface area may be another factor contributing to its excellent ethyl formate gas sensing performance. Originality/value The authors first developed an ethyl formate gas sensor, and the results were compared with the previously published data. The analysis showed the ZnO gas sensor demonstrated excellent sensing performance. This work highlights the potential of high response ethyl formate gas sensors to accurately evaluate fish meal quality.
研究领域:
材料科学
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食品科学
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产品关联
DOI
高影响因子
Sensor Review
·
2022
·Vol. 42
·期 1
·76-88
·
IF 1.544
Haowei Zhang,Lili Sun,Chengli Song,Ying Liu,Xueting Xuan,Fei Wang,Jing Zhong,Li Sun
Purpose Design, fabricate and evaluate all-solid-state wearable sensor systems that can monitor ion concentrations in human sweat to provide real time health analysis and disease diagnosis capabilities. Design/methodology/approach A human health monitoring system includes disposable customized flexible electrode array and a compact signal transmission-processing electronic unit. Findings Patterned rGO (reduced-graphene oxide) layers can replace traditional metal electrodes for the fabrication of free-standing all solid film sensors to provide improved flexibility, sensitivity, selectivity, and stability in ion concentration monitoring. Electrochemical measurements show the open circuit potential of current selective electrodes exhibit near Nernst responses versus Na+ and K+ ion concentration in sweat. These signals show great stability during a typical measurement period of 3 weeks. Sensor performances evaluated through real time measurements on human subjects show strong correlations between subject activity and sweating levels, confirming high degree of robustness, sensitivity, reliability and practicality of current sensor systems. Originality/value In improving flexibility, stability and interfacial coherency of chemical sensor arrays, rGO films have been the developed as a high-performance alternative to conventional electrode with significant cost and processing complexity reduction. rGO supported solid state electrode arrays have been found to have linear potential response versus ion concentration, suitable for electrochemical sensing applications. Current sweat sensor system has a high degree of integration, including electrode arrays, signal processing circuits, and data visualization interfaces.
研究领域:
生物医学工程
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材料科学
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电子工程
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DOI
高影响因子
Sensor Review
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2024
·Vol. 44
·期 3
·388-394
·
IF 1.6
Xiaotong Zhang,Qiu Zhang
PurposeThe purpose of this study is to develop a molecular imprinting electrochemical sensor for the specific detection of the anticancer drug amsacrine. The sensor used a composite of bacterial cellulose (BC) and silver nanoparticles (AgNPs) as a platform for the immobilization of a molecularly imprinted polymer (MIP) film. The main objective was to enhance the electrochemical properties of the sensor and achieve a high level of selectivity and sensitivity toward amsacrine molecules in complex biological samples.Design/methodology/approachThe composite of BC-AgNPs was synthesized and characterized using FTIR, XRD and SEM techniques. The MIP film was molecularly imprinted to selectively bind amsacrine molecules. Electrochemical characterization, including cyclic voltammetry and electrochemical impedance spectroscopy, was performed to evaluate the modified electrode’s conductivity and electron transfer compared to the bare glassy carbon electrode (GCE). Differential pulse voltammetry was used for quantitative detection of amsacrine in the concentration range of 30–110 µM.FindingsThe developed molecular imprinting electrochemical sensor demonstrated significant improvements in conductivity and electron transfer compared to the bare GCE. The sensor exhibited a linear response to amsacrine concentrations between 30 and 110 µM, with a low limit of detection of 1.51 µM. The electrochemical response of the sensor showed remarkable changes before and after amsacrine binding, indicating the successful imprinting of amsacrine in the MIP film. The sensor displayed excellent selectivity for amsacrine in the presence of interfering substances, and it exhibited good stability and reproducibility.Originality/valueThis study presents a novel molecular imprinting electrochemical sensor design using a composite of BC and AgNPs as a platform for MIP film immobilization. The incorporation of BC-AgNPs improved the sensor’s electrochemical properties, leading to enhanced sensitivity and selectivity for amsacrine detection. The successful imprinting of amsacrine in the MIP film contributes to the sensor's specificity. The sensor's ability to detect amsacrine in a concentration range relevant to anticancer therapy and its excellent performance in complex sample matrices add significant value to the field of electrochemical sensing for pharmaceutical analysis.
研究领域:
生物医学工程
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Neurogastroenterology and Motility
·
2016
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IF 1.817
Hongfei Li,Ji-Hong Chen,Zixian Yang,Min Huang,Yuanjie Yu,Shiyun Tan,Hesheng Luo,Jan D Huizinga
Background/Aims Neurotensin is a gut-brain peptide with both inhibitory and excitatory actions on the colonic musculature; our objective was to understand the implications of this for motor patterns occurring in the intact colon of the rat. Methods The effects of neurotensin with concentrations ranging from 0.1–100 nM were studied in the intact rat colon in vitro, by investigating spatio-temporal maps created from video recordings of colonic motility before and after neurotensin. Results Low concentration of neurotensin (0.1–1 nM) inhibited propagating long distance contractions and rhythmic propagating motor complexes; in its place a slow propagating rhythmic segmental motor pattern developed. The neurotensin receptor 1 antagonist SR-48692 prevented the development of the segmental motor pattern. Higher concentrations of neurotensin (10 nM and 100 nM) were capable of restoring long distance contraction activity and inhibiting the segmental activity. The slow propagating segmental contraction showed a rhythmic contraction—relaxation cycle at the slow wave frequency originating from the interstitial cells of Cajal associated with the myenteric plexus pacemaker. High concentrations given without prior additions of low concentrations did not evoke the segmental motor pattern. These actions occurred when neurotensin was given in the bath solution or intraluminally. The segmental motor pattern evoked by neurotensin was inhibited by the neural conduction blocker lidocaine. Conclusions Neurotensin (0.1–1 nM) inhibits the dominant propulsive motor patterns of the colon and a distinct motor pattern of rhythmic slow propagating segmental contractions develops. This motor pattern has the hallmarks of haustral boundary contractions.
研究领域:
生理学
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胃肠病学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Bingbing Liu,Yifei Zhang,Peidong Yang,Yanfang Huang,Yubin Xue,Hu Sun,Shuzhen Yang,Guihong Han
Zinc electrolyte crystallization sediment (ZECS) generated in the zinc hydrometallugy industry contains valuable metals of strontium (Sr), manganese (Mn), and zinc (Zn), which has economical value but poses potential detrimental to the environment. However, the extraction and recovery of Sr is extremely difficult due to the thermodynamically stable Ca and Sr sulfate cocrystallization structure in ZECS. The destruction of refractory sulfate cocrystallization structure is a prerequisite for Sr extraction, and the carbothermal reduction roasting method is demonstrated to be efficient for the phase reconstruction. In this study, a stepwise Sr, Mn, and Zn recovery process from ZECS via carbothermal reduction roasting-acid leaching-selective precipitation-multistage extraction was proposed. In the reduction roasting procedure, all the sulfates including CaSO 4 , SrSO 4 , and Ca 0.7 Sr 0.3 SO 4 are reduced to soluble sulfides. Meanwhile, most MnO 2 is converted to a low-valence Mn product (MnO) that is soluble in acid, and the reduced Zn (g) is volatilized which can be collected from the flue dust. In the acid leaching procedure, the leaching efficiencies of Sr, Ca, and Mn are as high as 97.34%, 97.44%, and 95.49% respectively, while 99.50% Si in the form of silica is enriched in the leaching residue. After that, high-purity Sr solution was obtained after selective precipitation for Mn removal and D2EHPA multistage extraction for Ca removal. 97.41% Mn in the leaching solution is precipitated by adjusting the pH value to 9.5 with NaOH solution. After four-stage extraction, 79.60% Sr and only 0.35% Ca are retained in the aqueous phase. The purified solution contains 2.88 g/L Sr, 0.052 g/L Ca, and 0.014 g/L Mn, which can be used to prepare industrial SrCO 3 product via the carbonation operation. Thermodynamic behavior and reduction roasting reconstruction mechanism of Ca and Sr sulfate cocrystallization structure in ZECS were discussed in this work. The distributions of main metal elements (Sr, Ca, Mn, and Zn) in ZECS during the carbothermal reduction roasting-acid leaching-selective precipitation-multistage extraction process were also systematically studied.
研究领域:
冶金学
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环境科学
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产品关联
DOI
高影响因子
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
·
2026
·
IF 3.3
Qishuai Huang,Shouqian Zhao,Yali Sun
Determining rare earth elements (REEs) and Sr-Nd isotope ratios at low abundance levels in ultramafic rocks remains a significant challenge. This study presents a simplified method for the separation of trace multi-elements using a tandem column of SR-TODGA resin combination, and thereby the elements at very low levels, and 87Sr/86Sr and 143Nd/144Nd ratios in ultramafic rocks were determined by inductively coupled plasma-mass spectrometry (ICP-MS) and thermal ionization mass spectrometry (TIMS). The samples were digested using HF-HNO3, and prepared to HNO3-H3BO3 solutions. After loading the sample solutions onto the tandem column, Sr was eluted from the SR resin column using 10 mL of 0.045 M HNO3. The TODGA column was eluted sequentially with 10 mL of 0.45 M HNO3 and 1.4 M HF for Zr, Hf, Th and U, 7 mL of 2.1 M HCl for La, Ce and Pr, 5 mL of 1.5 M HCl for Nd, and 10 mL of 0.06 M H2SO4 for other REEs (Sm-Lu and Y). The procedural recovery yields were evaluated by adding standards, and they ranged from 97.3% for La to 103.9% for Th. The blank ranges from 0.01 ng (Ho, Tm and Lu) to 24.4 ng (Sr). Eight ultramafic reference materials, JP-1, DTS-2b, UB-N, MUH-1, SARM-6, Harz01, DZΣ-1 and DZΣ-2, were analyzed, and the analytical results exhibit good agreement with certified and literature values. Therefore, the proposed method can be applied to accurately analyze both the contents of multi-elements at very low levels and Sr-Nd isotopic ratios in ultramafic rocks.
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产品关联
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高影响因子
JOM
·
2021
·Vol. 73
·期 6
·1745-1753
·
IF 2.474
Li Ke,Li Shuiyuan,Ai Fanrong,Yan Jinchao,Zhou Kui
Strontium (Sr) is a trace metal ion that exists in natural bones. It not only regulates metabolism but also promotes osteoblast differentiation and the formation of new bones. In this study, a new method was developed to prepare Sr-doped hydroxyapatite (HA) three-dimensional (3D) porous scaffolds. A preliminary scaffold was obtained by an extrusion 3D printing method using HA–sodium alginate composite slurry as printing ink. Then, the obtained scaffolds were immersed in a strontium chloride (SrCl 2 ·6H 2 O) solution of different concentrations (1 wt.%, 5 wt.%, 10 wt.%, and 15 wt.%) for 24 h. Finally, the scaffolds were dried and then sintered at 1200°C to obtain the final scaffolds. The Sr-doped scaffolds were characterized by scanning electron microscopy, x-ray diffraction, Fourier-transform infrared spectroscopy, mechanical testing, and cell culture testing. The results show that the Sr-doped HA scaffold has better compactness and compressive strength than the HA-0Sr scaffold, and promotes cell proliferation and osteoblast differentiation. This indicates that the alternative method is suitable for preparing ion-doping ceramic scaffolds for bone tissue engineering.
研究领域:
生物材料学
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医学工程
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
IONICS
·
2025
·
IF 2.6
Wan ZiYi,Lv JingBo,Zhang YaXin
High-entropy perovskite oxides (HEPOs) have emerged as promising electrode materials for supercapacitors. In this study, we successfully synthesized a series of HEPOs La 1- x Sr x (Co 0.2 Mn 0.2 Fe 0.2 Ni 0.2 Cu 0.2 )O 3 , using the sol–gel method. We thoroughly investigated the impact of Sr doping on the electrochemical properties of HEPO materials. Our findings indicate that the incorporation of a small amount of Sr enhances ionic conductivity and promotes the formation of oxygen vacancies and ionic vacancies within the crystal structure. The incorporation of Sr significantly improves the electrochemical performance of HEPOs materials. La 0.9 Sr 0.1 (Co 0.2 Mn 0.2 Fe 0.2 Ni 0.2 Cu 0.2 )O 3 electrode exhibits a maximum specific capacitance of 204.33 F/g at a scan rate of 2 mV/s, a significant increase compared to the undoped La(Co 0.2 Mn 0.2 Fe 0.2 Ni 0.2 Cu 0.2 )O 3 sample. Furthermore, La 0.9 Sr 0.1 (Co 0.2 Mn 0.2 Fe 0.2 Ni 0.2 Cu 0.2 )O 3 electrode exhibits excellent rate performance, maintaining 74% of its capacity when the current density was increased from 1 to 5 A/g. It also exhibits good cycling stability, with nearly no attenuation after 1000 cycles. Therefore, these results underscore the potential of our synthesized high-entropy perovskite oxides as electrode materials for supercapacitors applications.
研究领域:
材料科学
·
电化学
·
储能技术
✓ 已验证
产品关联
DOI
高影响因子
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