THERMOCHIMICA ACTA
·
2023
·
IF 3.5
Yongchen Zhu,Jianwei Zhang,Weidong He
5-Amino-1H-tetrazole (5-ATZ), an environmentally friendly energy-containing material for new propellants, is gradually applied in high-energy propellants and its ionic salt compounds have received wide attention. This study focused on investigating the interaction mechanism of guanidinium-5-aminotetrazole (GA) and nitrocellulose (NC) by kinetic methods and TG-DSC-FTIR analysis. DSC and TG experiments indicated that there was a certain interaction during the pyrolysis process of NC and GA. Comparing the kinetic models of NC and peak 3 in NC-GA, it can be found that the addition of GA mainly affected the m-value and contribution in the second step B→C, and the mechanism function changed from F n to C n,m. TG-DSC-FTIR experiments indicated that the initial decomposition product of NC, NO 2 , participated in the thermal decomposition process of GA, and the two reacted chemically to form CO, N 2 O, which made NO 2 unable to completely oxidize the skeleton of NC to produce CH 2 O, HCOOH.
研究领域:
化学
·
材料科学
·
能源与推进剂研究
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Renjie Li,Yiran Pu,Jian Xu,Qingfeng Fu,Guisheng Liang,Xiangzhen Zhu,Lijie Luo,Yongjun Chen,Chunfu Lin
To meet the demand of high power and energy densities of Li-ion batteries, M-Nb-O compounds are of significance due to not only the intercalation pseudocapacitance but also the high theoretical capacities and excellent cycling stability. However, the exploration of M-Nb-O is very limited. Herein, we firstly report GaNb 49 O 124 as a novel intercalation-type M-Nb-O anode material . GaNb 49 O 124 microspheres (GaNbO-S) with an average diameter of ∼2 μm are fabricated through a hydrothermal method . Benefiting from the nanosized architecture, GaNbO-S delivers superior electrochemical performance in Li-ion batteries. A large reversible specific capacity of 294 mAh g −1 is obtained at 50 mA g −1 , while 205 mAh g −1 is reached at 4000 mA g −1 . Furthermore, GaNbO-S delivers long-term cycling life with a 72.0% capacity retention over 1800 cycles at 2000 mA g −1 . Thus, GaNb 49 O 124 microspheres could be developed as an efficient anode material for Li-ion batteries.
研究领域:
材料科学
·
电化学
·
能源存储
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DOI
高影响因子
Advanced Optical Materials
·
2024
·Vol. 12
·期 23
·2400762
·
IF 8
Wentao Niu,Xiulin Xie,Zhong Chen,Ruixin Sun,Yu Li,Shuaibing Wang,Yu Zhang,Chunhe Yang,Aiwei Tang
Recently, I-III-VI type quantum dots (QDs) have attracted considerable attention in display technology due to their large-scale tunable emission and environmentally friendly characteristics. However, within this family, narrow-bandwidth Cu-based QDs have rarely been reported. Herein, the synthesis of narrow-bandwidth blue-emitting Cu-Ga-S (CGS)-based QDs is reported by a hot-injection method for the first time, boasting a narrow full width at half-maximum (FWHM) of 29 nm, closely approaching that of traditional Cd-based QDs. Through precisely controlling the temperature of nucleation stage, CGS-based QDs showcase a representative blue emission at 475 nm, featuring the narrowest FWHM and a photoluminescence quantum yield (PLQY) of 32%. Besides, the femtosecond transient fluorescence (fs-TA) characterization indicates that the narrow-bandwidth luminescence is attributed to band-to-hole recombination rather than donor-acceptor pair (DAP) recombination. The work opens a new avenue for narrow-bandwidth I-III-VI QDs, offering increased potential for applications in blue-light-emitting devices.
研究领域:
材料科学
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光学
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产品关联
DOI
高影响因子
Nanoscale
·
2024
·Vol. 16
·期 28
·13654-13662
·
IF 5.8
Naiwei Wei,Hong Zhu,Danni Yan,Shuai Yang,Lili Xu,Shengli Zhang,Yuhui Dong,Yousheng Zou,Haibo Zeng
I–III–VI quantum dots (QDs) have gained widespread attention owing to their significant advantages of non-toxicity, large structural tolerance, and efficient photoluminescence potential. However, the disbalance of reactivity between the elements will result in undesired products and compromised optical properties. Reducing the activity of highly reactive group IB elements is the most common approach, but it will reduce the overall reactivity and lead to a wide dispersion of QD sizes. In this study, we propose a method to improve the overall reactivity of the reaction system using the highly active IIIA precursor InI3, which triggers rapid nucleation and promotes the formation of Ag(In,Ga)S2 (AIGS) QDs, resulting in monodisperse particle size distributions and a significantly improved photoluminescence quantum yield (PLQY) (from 12% to 72%). Furthermore, narrow band edge emission is realized by coating a gallium sulfide (GaSx) shell on the basis of obtaining high-quality AIGS QDs. The core/shell QDs exhibit a 90% PLQY with a full width at half maximum (FWHM) of only 31 nm at 530 nm. This study provides a viable design strategy to synthesize monodisperse AIGS QDs with a narrow peak width and efficient luminescence, promoting the application of AIGS QDs in the field of luminescent displays.
研究领域:
材料科学
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纳米技术
·
光学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
·
2019
·Vol. 166
·期 15
·D882
·
IF 3.12
Da-Wei Yang,Ke-Ke Chang,Xiao-Fei Hu,Ya-Lan Liu,Tai-Qi Yin,Shi-Lin Jiang,Mei Li,Wei Han,Zhi-Fang Chai,Wei-Qun Shi
The objective of this work is to explore the electrochemical and electrodeposition behaviors of Eu (III) cation at the liquid binary Al-Ga alloy cathode. In addition, the co-reduction behaviors of Eu (III), Al (III) and Ga (III) were also systematically studied on a W electrode. The results indicated that Eu (III) can be reduced on the binary Al-Ga alloy cathode, and Eu (III), Al (III) and Ga (III) also can be co-reduced on the W electrode to form Al-Eu/Ga-Eu intermetallic compounds. At the same time, the isothermal section phase diagram of the Al-Ga-Eu ternary system at 773 K was also calculated. In addition, Al-Eu and Ga-Eu alloys were prepared by potentiostatic and galvanostatic electrolyses in the LiCl-KCl-EuCl3 melt. Finally, the electrodeposition products were characterized by X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) coupled with Energy Dispersive Spectroscopy (EDS).
研究领域:
材料科学
·
电化学
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DOI
高影响因子
ACS Applied Energy Materials
·
2020
·
IF 4.473
Chao Chen,Yao Sun,Linchun He,Masashi Kotobuki,Emil Hanc,Yu Chen,Kaiyang Zeng,Li Lu
The Garnet-type solid electrolyte Li7La3Zr2O12 (LLZO) showing high ionic conductivity and a wide electrochemical potential window is considered as one of the most promising candidates for solid-state batteries. Among various doping derivatives, the Al- and Ga-doped LLZO electrolytes are intensively studied because of their ability to enhance the stability of the cubic structure and to promote good sinter ability as well. Despite showing great similarities in site preference and sintering behavior, the Al and Ga doping derivatives differ by 1 order of magnitude in total ionic conductivity. Therefore, a comparative study on the doping characteristics of Al and Ga with respect to ionic conductivity and sintering behavior is necessary. Herein, we simultaneously introduced Al and Ga into Li sites (AlxGa0.25–x-LLZO) to study their influences on the microstructure and electrochemical properties of LLZO. The results show that Ga doping enables a higher conductivity than Al doping and largely promotes sinter ability at the same time. Compared to Al single doping (Al0.25), Ga-contained compositions (x < 0.25) show significant grain growth. Moreover, a slight inclusion of Ga (Al0.20Ga0.05) not only modifies the sintering behavior that results in a microstructure transition from fine grains of Al0.25 (5–20 μm) to abnormally large grains (several hundred micrometers) but also greatly enhances the conductivity, yielding a value that is 3 times higher. However, further increases in Ga ratio in AlxGa0.25–x results in marginal increases in conductivity. The total conductivity reaches a maximum of 1.19 × 10–3 S cm–1 for Ga single doping (Ga0.25) at room temperature. In addition, Al0.25 also shows fast ion conducting behavior along the grain boundaries with a conductivity of 8.30 × 10–4 S cm–1. Consequently, this study sheds lights on the different doping characteristics between Al and Ga, providing guidance for fine composition engineering of these two promising dopants.
研究领域:
材料科学
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电化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Pengfei Pang,Yi Liu,Hu Wang,Mingjie Liao,Hongdou Wei,Jiangchao Chen,Shenfeng Long,Wenping Liu,Kunpeng Jiang,Guisheng Zhu,Huarui Xu,Yunyun Zhao
The cubic phase Li7La3Zr2O12 (c-LLZO) has garnered significant attention as a crucial solid-state electrolyte material for high-energy-density Li metal batteries due to its exceptional chemical stability and safety characteristics. Ga-doped LLZO (Ga-LLZO) has emerged as one of the leading systems owing to its superior ionic conductivity; however, the interfacial instability between Ga-LLZO and Li metal and its underlying mechanisms remain inadequately understood. This study systematically modulated the Ga content in Li6.4GaxLa3Zr2–(0.6–3x)Ta0.6–3xO12 (GaxTa0.6–3x). The aim was to investigate the ionic conductivity enhancement mechanism in Ga-LLZTO and analyze the failure behavior of its interface with Li metal during a high-temperature coating. Ultimately, this work seeks to determine the optimal Ga content for achieving a stable Li metal interface. The results reveal that the improvement in room-temperature ionic conductivity of Ga-LLZTO is attributed to Coulombic repulsion between Ga3+ and Li+. This enhancement effect is only effective below 45 °C. At elevated temperatures, Li+ possesses a sufficient intrinsic driving force for migration within the electrolyte lattice, while Ga3+ occupation of Li sites conversely impedes carrier mobility. Furthermore, the reaction between Ga-LLZTO and Li metal leads to the formation of the Li–Ga alloy and LiGaO2 phases. When the highly electronically conductive alloy phase forms at the electrolyte/Li metal interface, it promotes uniform electron distribution, reduces polarization voltage, and improves interfacial contact. Conversely, accumulation of Li–Ga alloy phases within the electrolyte bulk induces electrolyte failure. The results demonstrate a critical Ga doping threshold at x = 0.10. Within this threshold range, the critical current density (CCD) exhibits a negative correlation with Ga doping content. The Li||Ga0.10Ta0.30||Li symmetric cell demonstrates stable cycling for 537 h at a current density of 0.1 mA cm–2. The formation of detrimental Li2GaO2, Li5GaO4, and Li–Ga alloy phases within the electrolyte bulk induces soft short circuits, resulting in cell failure through a mechanism distinct from conventional Li dendrite penetration. The LiFePO4||Ga0.10Ta0.30||Li full cell achieves a discharge capacity of 144.1 mAh g–1 after 100 cycles with a capacity retention of 92.8%. In conclusion, this work clarifies the regulation mechanism of Ga-LLZTO stability and reveals the dual role of Li–Ga alloys. These findings provide a theoretical foundation for the rational application of Ga-doped garnet-type solid electrolytes.
研究领域:
材料科学
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电化学
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储能技术
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固态电池
·
陶瓷材料
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产品关联
DOI
PubMed
高影响因子
Materials Today Bio
·
2026
·
IF 11
Saadullah Khattak,Salim Ullah,Muhammad Tufail Yousaf,Jianliang Shen,Xiaoqun Xu,Hong-Tao Xu
Bacterial infection and severe inflammatory responses are major barriers to successful wound healing. Drug delivery systems have shown promise in precision medicine by enhancing the targeting and protection of therapeutic agents. However, their use is limited by challenges such as biocompatibility issues, structurally complex, high manufacturing costs, suboptimal drug loading, unstable release, and premature immune clearance. Although targeted delivery aims to improve efficacy, it may increase the risk of toxicity. Consequently, conventional non-carrier drugs often remain more practical and effective. Emerging vehicle-free systems with multifunctional capabilities show promise for precise targeting, controlled release, reduced toxicity, and simplified manufacturing. Here, we rationally designed and established a vehicle-free perfluoroalkyl material (PFAS)–gallium composites (PFASs@Ga) through introducing gallium (Ga) in PFASs, taking advantage of the collective merits of Ga’s antibacterial and pro-healing properties and PFAS’s well-recognized oxygen absorption, carrying of oxygen, chemical inertness, and tunable physicochemical properties. Extensive characterization showed well-defined morphology, elemental configuration, and distinct profiles of gallium ion release. The PFUnA@Ga composite improves gallium integration, Ga release, and O 2 delivery. This allowed it to demonstrate potent broad-spectrum antibacterial activity against bacteria, including MRSA and E. coli , which are known to be resistant. In a MRSA -infected wound model, PFUnA@Ga enhances wound closure and reduces bacterial load, thereby promoting regeneration and angiogenesis. The downregulation of pro-inflammatory M1 macrophages and the upregulation of anti-inflammatory M2 macrophages and CD31 + endothelial cells, representing immunomodulatory effects that facilitate inflammation resolution and vascularization. Results confirmed the composites’ antibacterial activity and accelerated wound-healing efficacy. This multifunctional composite offers a novel approach for advanced wound management. More specifically, the synergistic approach combines metal–ion mediated bacterial inactivation with sustained oxygenation to support infection control and tissue repair.
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2026
·
IF 9.6
Dong Liang,Xi Jiang,Yingxuan Guo,Yong Wang,Guidong Ju,Yafeng Chen,Quan Wang,Junfeng Liu
Alcohol electrooxidation is an important anodic reaction in alkaline electrochemical energy-conversion systems, yet its performance is often limited by sluggish reaction kinetics and catalyst deactivation associated with strongly adsorbed intermediates. Herein, Ga was introduced into the Pd 2 Sn intermetallic to regulate its surface reaction energetics. A series of composition-controlled ternary Pd 2 (Sn 1-x Ga x ) intermetallic nanoparticles were synthesized through a ligand-regulated colloidal strategy. Systematic compositional optimization identified Pd 2 (Sn 0.87 Ga 0.13 ) as the optimal catalyst, which exhibited enhanced catalytic activity, continuous operational stability, and electrochemical regenerability toward glycerol, methanol, and ethylene glycol oxidation in alkaline media. For glycerol oxidation, Pd 2 (Sn 0.87 Ga 0.13 ) delivered a mass activity of 3.21 A mg Pd −1 and a specific activity of 16.31 mA cm −2 , while quantitative product analysis identified glyceric acid as the predominant liquid product. Density functional theory calculations suggest that Ga incorporation modifies the surface reaction energetics by strengthening hydroxyl adsorption and weakening glyceric acid binding, thereby facilitating intermediate conversion and product desorption. This work suggest that precise Ga engineering of Pd 2 Sn intermetallics can effectively tune surface reaction energetics and provide a viable strategy for improving the catalytic performance and resistance to deactivation of alkaline alcohol oxidation electrocatalysts. Download: Download high-res image (441KB) Download: Download full-size image
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DOI
高影响因子
CRYSTAL GROWTH & DESIGN
·
2021
·
IF 4.076
Lei Wang,Xudong Liu,Xiaoguo Bi,Zhixin Ma,Jinsheng Li,Xudong Sun
(Ln + Nb) co-doped TiO2 polycrystalline ceramics possess remarkable dielectric behaviors, but their origin is still not fully understood. Compared to ceramic materials, a single crystal could keep most of the original material’s properties and eliminate interference due to grain boundaries and pores, thereby useful for exploring the origin of the material’s properties. Here, Ga3+ with a radius close to that of the Ti4+ ion was selected as an acceptor ion to study the properties. To this end, rutile single crystals and (Nb + Ga) co-doped rutile single crystals were prepared by the Verneuil method. The permittivity of the doped single crystal at frequencies from 20 Hz to 2 MHz was found to be greater than 15,000, and the dielectric loss was kept below 0.08. The latter value was much smaller than the reported values of rutile single crystal samples. Electrochemical impedance spectroscopy and X-ray photoelectron spectroscopy indicated significantly enhanced dielectric properties, mainly attributed to the highly localized electron-pinned defect dipoles rather than the surface barrier layer capacitor effect. The electrons tightly bounded by the local electric dipole defect clusters can only range over a very small distance, which made the doped crystal have a large dielectric constant over a wide frequency range and maintain a low dielectric loss. In sum, the use of single crystals as a research object greatly provided insights into the origin and optimization of giant dielectric properties of TiO2-based materials.
研究领域:
材料科学
·
介电与电磁材料
·
固态物理
·
晶体生长
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DOI
高影响因子
Science China-Physics Mechanics & Astronomy
·
2018
·Vol. 61
·期 9
·1-4
·
IF 2.754
Zhang Yue,Liu Wenhao,Si Jin,Zhu Xiyu,He Chengping,Zhao Haonan,Wen Hai-Hu
Superconductivity is observed in a new nontoxic cuprate system Ga-Ba-Ca-Cu-O, with T c = 82 K for GaBa 2 Ca 5 Cu 6 O 14 + δ ( 5 (Ga-1256) and T c = 116 K probably for GaBa 2 Ca 3 Cu 4 O 10+δ (Ga-1234) or GaBa 2 Ca 2 Cu 3 O 8+δ (Ga-1223), respectively. All compounds are fabricated by solid state reaction method under high pressure and high temperature. Samples are characterized by resistivity, magnetization and X-ray diffraction (XRD) measurements. The temperature dependence of magnetization measured in both zero-field-cooled and field-cooled processes on one sample (S1) shows two superconducting transitions at about 82 K and 113 K. The estimated shielding fraction for the phase with T c of 82 K is about 67%, while the fraction for another phase with T c of 113 K is quite small. The XRD Rietveld refinement for S1 indicates two main phases existing in the sample, Ga-1256 with fraction of about 58% and non-superconducting Ca 0.85 CuO 2 with fraction of about 42% respectively. Thus, we can conclude the superconducting phase with transition temperature of 82 K is due to Ga-1256. The resistivity measurement also confirms the superconductivity for S1, and the resistivity reaches zero at about 82 K. The temperature dependence of magnetization for another sample (S2) shows much higher superconducting shielding fraction for the phase with T c of 116 K, which may be a promising prospective for the synthesis of Ga-1234 or Ga-1223 phase.
研究领域:
凝聚态物理
·
超导物理
·
材料科学
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DOI
高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Zeyu Yin,Xiaobo Ma,Lijian Ni,Huaijun Sun,Yueyue Wang
The PEC sensor constructed from wide-bandgap Ga₂O₃ and narrow-bandgap CdS for enhanced tetracycline (TC) detection, overcoming conventional limitations like low sensitivity and complex operation. CdS/Ga₂O₃ composites were synthesized via a one-step hydrothermal method, enabling efficient separation and transport of photogenerated carriers through band modulation. Compared with pure CdS or Ga₂O₃, the heterojunction exhibited a sixfold photocurrent enhancement, improved response time, and superior stability. The sensor demonstrated excellent repeatability (RSD = 0.359%), selectivity, and sensitivity for TC concentrations from 1 pM to 50 μM, achieving a low detection limit of 0.045 μM. Tests on lake and river water confirmed high practical applicability, with RSD<2%. To further improve detection accuracy, three machine learning algorithms—SVR, Random Forest, and XGBoost—were applied to photoelectric response data across TC concentrations, using cross-validation and feature selection to build predictive models. Random Forest outperformed others, offering the best error evaluation and fitting accuracy while reinforcing the linear correlation between TC concentration and photoelectric response. This work provides new insights into quantitative antibiotic detection and underscores the potential of heterojunction engineering for PEC sensor optimization.
研究领域:
环境监测
·
分析化学
·
材料科学
·
光电化学
·
机器学习应用
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）