WEAR
·
2020
·
IF 4.108
Wei Sun,Xiaojun Liu,Kun Liu,Wei Wang,Jiaxin Ye
Nanosized α-phase alumina has been one of the few inorganic fillers that could induce 10 −7 mm 3 /Nm ultralow wear rates of PTFE for the past two decades. We report here two additional oxide fillers, beryllia (BeO) and germania (GeO 2 ) particles, that exhibit comparable wear reduction ability when filled in PTFE. Particle size and surface chemistry analysis revealed that the beryllia and germania particles had different structure and size from the alumina fillers used in this study whereas their composites shared similar ultralow wear rates and carboxylate salt rich tribofilms to the alumina PTFE system. Results in this study support both a particle structure driven and a tribochemistry driven wear reduction hypothesis for the alumina PTFE composite as previously suggested; whereas more systematic investigations are needed to elucidate wear resistance mechanisms in the beryllia and germania filled PTFE composites.
研究领域:
材料科学
·
表面工程
·
摩擦学
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产品关联
DOI
高影响因子
Journal of Functional Biomaterials
·
2023
·Vol. 14
·期 3
·154
·
IF 4.8
Yingqi Ji,Shun Yang,Jian Sun,Congqin Ning
The treatment of infective or potentially infectious bone defects is a critical problem in the orthopedic clinic. Since bacterial activity and cytocompatibility are always contrary factors, it is hard to have them both in one material. The development of bioactive materials with a good bacterial character and without sacrificing biocompatibility and osteogenic activity, is an interesting and valuable research topic. In the present work, the antimicrobial characteristic of germanium, GeO2was used to enhance the antibacterial properties of silicocarnotite (Ca5(PO4)2SiO4, CPS). In addition, its cytocompatibility was also investigated. The results demonstrated that Ge–CPS can effectively inhibit the proliferation of bothEscherichia coli(E. coli) andStaphylococcus aureus(S. aureus), and it showed no cytotoxicity to rat bone marrow-derived mesenchymal stem cells (rBMSCs). In addition, as the bioceramic degraded, a sustainable release of germanium could be achieved, ensuring long-term antibacterial activity. The results indicated that Ge–CPS has excellent antibacterial activity compared with pure CPS, while no obvious cytotoxicity was observed, which could make it a promising candidate for the bone repair of infected bone defects.Keywords:implant material;silicocarnotite;germanium dioxide;antibacterial activity;cytocompatibility
研究领域:
生物医学工程
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材料科学
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微生物学
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DOI
PubMed
高影响因子
e-Journal of Surface Science and Nanotechnology
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2016
·
IF 0
T. Wei,L. Z. Pei,N. Lin
Ce doped germanium dioxide nanowires with cubic GeO2 and tetragonal CeGeO4 phases have been synthesized by the hydrothermal route using sodium dodecyl sulfate (SDS) as the surfactant. The nanowires have the length and diameter of about 20 μm and 50–200 nm, respectively. The SDS assisted growth process is proposed to explain the formation of the Ce doped germanium dioxide nanowires. Ce doped germanium dioxide nanowires is used as the photocatalyst for the photocatalytic degradation of gentian violet (GV) under solar light irradiation. The roles of the solar light irradiation time, content of the nanowires and GV concentration on the photocatalytic degradation of GV are investigated. GV can be totally degraded under solar light irradiation for 240 min using 15 mg nanowires in 10 mL GV solution with the concentration of 10 mg · L−1. The Ce doped germanium dioixde nanowires show good application potential for the removal of organic pollutants under solar light irradiation. [DOI: 10.1380/ejssnt.2016.4]
研究领域:
材料科学
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环境科学
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DOI
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Zihang Zeng,Xujun Wang,Tianhui Yang,Yuanyuan Li,Xiaofeng Liu,Peng Zhang,Bo Feng,Taiping Qing
Designing highly active nanozymes for bioanalysis and environmental sensing remains a challenge. In this study, transition metal, palladium (Pd) and iron (Fe), doped germanium oxide (GeO 2 ) nanozyme was designed and optimized. Compared with the pristine GeO 2 nanozyme, the transition metal doped GeO 2 nanozyme have lower Michaelis-Menten constants and higher catalytic activity , indicating that the Pd and Fe doped GeO 2 nanozyme not only enhance their affinity for the substrate but also improve its catalytic activity. In addition, a colorimetric sensor based on the GeO 2 @Pd–H 2 O 2 -TMB system was constructed for the visual detection of simazine in water samples due to the good affinity between TMB and simazine. This sensor has good selectivity and sensitivity with a detection limit of 6.21 μM because of the highest catalytic performance of GeO 2 @Pd nanozyme. This study broadens the application of nanozymes in environmental field and other nanozymes can also be enhanced in activity by simple transition metal doping.
研究领域:
生物分析
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环境传感
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纳米技术
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催化
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产品关联
DOI
PubMed
高影响因子
MATERIALS & DESIGN
·
2025
·
IF 7.9
Jiaxiang Liu,Linping He,Da Li,Xin Wang,Lin Liu,Jianqing Lin,Kaiyan Huang
Medicine counterfeiting is a serious issue worldwide, involving potentially devastating health repercussions. Optical technologies have emerged as a promising solution for anti-counterfeiting tagging of pharmaceuticals. However, conventional systems relying on human-visible authentication modes remain susceptible to trial-and-error decryption, posing security vulnerabilities. To address this limitation, we have developed a novel multi-mode phosphor, Mg 3 Y 2 Ge 3 O 12 :Bi 3+ /Pr 3+ /Yb 3+ /Er 3+ (MYGBP-Yb/Er), featuring distinctive visible and non-visible spectral characteristics for high-security medicine anti-counterfeiting. This material simultaneously demonstrates green up-conversion luminescence (UCL) under 980 nm excitation, red down-shifting luminescence (DSL) upon UV stimulation, and persistent luminescence (PersL) spanning UV to visible spectral regions after UV excitation. The UV PersL component, while completely invisible to human vision, serves as a robust hidden authentication layer that can only be revealed through specialized detection using bandpass filters coupled with charge-coupled device (CCD) cameras. This unique combination of visible and non-visible luminescent features enables the realization of information protection that resists conventional counterfeiting attempts. In addition, changing the doping elements (such as Tb 3+ or Ho 3+ ) can achieve the regulation of the luminescence performance. Ultimately, we establish a sophisticated multi-level medicine verification system based on these phosphors, enhancing protection against forgery through its integrated visible authentication and CCD-readable covert security features.
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DOI
高影响因子
FUEL PROCESSING TECHNOLOGY
·
2025
·
IF 7.7
Luxin Zhang,Lu Wang,Weiwei Shi,Yi Feng,Rong Chen
Abundant lipids-containing sewage sludge are potential inexpensive alternative substrate for biodiesel production. Herein, a novel polyoxometalate, Cs 10 [H 1.8 Ge 3.2 Nb 11 O 39 ], with desirable acid-base bifunctionality, was synthesized. It demonstrated high efficiency in facilitating biodiesel production from sewage sludge, through in-situ esterification/transesterification, resulted in maximum biodiesel yields of 94.4 %. The catalyst exhibited good resistance to free fatty acids and demonstrated high water tolerance, retaining over 60 % yield even at 99 wt% moisture. To predict and optimize biodiesel yield from sewage sludge, this study presents a novel machine learning framework that integrates Radial Basis Function (RBF) interpolation-based data augmentation with Artificial Neural Network (ANN) modeling, achieving a high coefficient of determination (R 2 = 0.96) and reduced prediction errors. The incorporation of RBF-enhanced data augmentation effectively mitigates model overfitting while improving cost-effectiveness. The influence of each parameter and relative importance of key reaction parameters on biodiesel production was elucidated by SHapley Additive exPlanations and partial dependence analysis. The physicochemical characteristics of the produced biodiesel met the specifications of international standards, indicating its potential to replace diesel fuel. This study not only offers a new approach to advancing sustainable biodiesel production processes with cheap substrates but also provides practical guidance for sewage sludge treatment and upcycling.
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DOI
高影响因子
Journal of Water Process Engineering
·
2025
·
IF 6.7
Hanjun Wu,Shiyin Gui,Zhenyue Zhang,Wenda Guo,Xiangyi Deng,Junxia Yu
In this work, chitosan was modified by extracting the polyphenols rich in pomegranate peels to prepare the bio-composite material (PPPs-CS), which was applied to capture the dispersed metal germanium (Ge(IV)) in wastewater. The experimental results indicate that PPPs-CS exhibits the best adsorption performance for Ge(IV) at pH 7.0 with a dosage of 0.7 g/L. The adsorption behavior conforms to the pseudo-second-order kinetics and the Langmuir model, with the maximum adsorption capacity fitted by the Langmuir model reaching 71.34 mg/g. The results of dynamic adsorption mass transfer simulations showed that the capture behavior of PPPs-CS on Ge(IV) was dominated by the chemical adsorption of monomolecular layer. The adsorption partition coefficient of PPPs-CS for Ge(IV) with coexisting metal ions of Mn(II), Cd(II), Ca(II) and Ga(III) was as high as 11.23 L/g, exhibiting a selectivity coefficient more than 3.5 times higher than that of competing ions and demonstrating superior selectivity. After five adsorption-desorption cycles, the capture rate was still greater than 87 %. DFT calculations indicated that the uptake of Ge(IV) by PPPs-CS might be due to the ion exchange and complexation between the catechol groups on the surface of the PPPs-CS and Ge(OH) 4 . The pomegranate peel polyphenols could effectively improve the diversity and chemistry of the active sites for Ge(IV) binding by chitosan and enhance the specific recognition performance for Ge(IV). Overall, PPPs-CS has significant advantages and potential as environmentally friendly and cost-effective materials for the recovery of Ge(IV) from wastewater.
研究领域:
环境科学
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材料科学
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化学工程
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废水处理
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重金属回收
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2025
·
IF 7.2
Wenqian Xu,Xiangyu Zhang,Yuqiang Wang,Dingjun Jia,Dangli Gao
Persistent luminescence (PersL) materials hold immense potential for information storage and anti-counterfeiting applications. However, realizing non-volatile optical memory remains challenging. Herein, we design Mg 2 GeO 4 :Bi 3+ ,Ln 3+ (Ln = Tb, Eu) PersL phosphors via non-equivalent substitution engineering, where Bi 3+ and Ln 3+ ions deliberately occupy non-equivalent Mg1/Mg2 sites to create bistable deep traps. This strategy generates an ultra-broadband, high-density trap distribution, enabling strong photo/thermo-stimulated luminescence for recalling excitation-field temperatures. The trapped carriers exhibit temperature-dependent storage and release dynamics, allowing reconstruction of excitation thermal histories. Based on this unique behavior, reconfigurable optical memory anti-counterfeiting patterns in phosphor films are demonstrated. The trapping mechanism, validated by thermoluminescence and XPS spectra, reveals that carrier redistribution follows Fermi-Dirac statistics governed by the interaction between trap levels and thermal lattice waves. This work opens new avenues for non-volatile optical data storage with high security and spatiotemporal resolution.
研究领域:
材料科学
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光学存储
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发光材料
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固态物理
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信息安全
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·Vol. 51
·期 14
·18513-18519
·
IF 5.6
Haixia Zheng,Zhongxiang Shao,Faling Ling,Li Li,Guotao Xiang,Yongjie Wang,Xianju Zhou
The effectiveness of near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) is primarily determined by the NIR phosphors. Unfortunately, there is still a shortage of effective broadband near-infrared luminescent materials which emit NIR light with wavelengths exceeding 800 nm. Herein, Cr 3+ doped SrGe 4 O 9 phosphors were prepared by a high-temperature solid-state reaction. The phosphor exhibits a wide NIR emission spanning from 650 to 1250 nm, with the center located at approximately 846 nm. It demonstrates a full width at half maximum (FWHM) of 190 nm and a quantum yield of 66.9 % when excited by the blue light at 442 nm. When subjected to 373 K, the luminescence intensity of the phosphor remains above 80 % of the value at room temperature . The application in night vision and biological imaging have been realized by the prepared SrGe 3.99 O 9 : 1%Cr 3+ phosphor combined with a commercial 440 nm blue chip.
研究领域:
材料科学
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光电子学
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光子学
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发光材料
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固态照明
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产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·Vol. 46
·期 6
·118067
·
IF 6.2
Hongji Zou,Jie Li,Ziyi Zhang,Ying Tang,Weiping Gong,Liang Fang
Novel low-permittivity Mg 7 Ga 2 GeO 12 ceramics with unique crystal structure consisting of rock-salt and β -Ga 2 O 3 blocks were prepared by the solid-state method. When sintered at 1380 °C, it showed ultra-high Q × f = 145,000 ± 300 GHz, low ε r = 10.5 ± 0.1, and τ f = −50.7 ± 1.0 ppm/°C. The positive deviation between the ε r and ε r (C–M) (8.7) of 21.2 % was due to the underestimating dielectric polarizability. The Phillips-Van Vechten-Levine (P-V-L) theory results indicated that the (Mg4/Ga1)-O bond had the greatest impact on the ε r and thermal stability, while the (Ga5/Ge1)-O bond mainly contributes to lattice energy. The intrinsic dielectric properties were analyzed by infrared reflectivity spectra. To demonstrate its potential for practical applications, a dielectric resonator antenna (DRA) based on Mg 7 Ga 2 GeO 12 ceramic was designed and fabricated, exhibiting a high gain (6.6 dBi) and radiation efficiency (> 98.3 %).
研究领域:
材料科学
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陶瓷与复合材料
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微波工程
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电子封装
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介电材料
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产品关联
DOI
高影响因子
MATERIALS LETTERS
·
2025
·
IF 2.7
Dinghan Jin,Tingting Yan,Dongyang Xi,Gege Li,Meng Li
This work synthesizes 2D layered K 6 H 4 Nd 2 Ge 6 O 20 via hydrothermal methods. Structural analysis reveals vertex-linked NdO 6 and GeO 4 /GeO 4 H units with interlayer K + and hydrogen bonding, while X-ray photoelectron spectroscopy (XPS) confirms the trivalent state of Nd ions. Correlative microscopy conclusively establish the correspondence between macroscopic lamellar morphology and the c-axis layered framework, with the c-axis dictating crystal growth. The compound exhibits intense Nd 3+ near-infrared (NIR) emission (1064 nm), showcasing potential for photonic applications and advancing rare-earth germanate design principles.
研究领域:
材料科学
·
无机化学
·
光物理
·
稀土材料
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产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Sur Lig,Kai Li,Yu Zhang,Hala Muji,Ze Wang,Qixu Tian,Rimai Na,Xinyu Gu,Yuansong Gao,Kefu Chao
Exploring multiple emission bands from single rare-earth doped phosphors and developing design principles to enhance brightness and temperature sensing capabilities are key challenges in advanced optical applications and research. Herein, we report a novel Sr 6 Ge 2 O 7 Cl 6 :Eu 2+ (SGOC:Eu 2+ ) phosphor and that exhibits three emission bands at 400, 501, and 670 nm. These bands are resolved into four Gaussian peaks, attributed to 5d-4f transitions of Eu 2+ ions occupying four distinct Sr 2+ sites. Resolved into four Gaussian peaks, attributed to 5d-4f transitions of Eu 2+ occupying four distinct Sr 2+ sites. Energy levels were quantified via Van Uitert equation and lattice distortion analysis. The unique thermal quenching disparity between high-energy (400 nm) and low-energy (501 nm) emissions enables superior temperature sensing, achieving absolute and relative sensitivities of 3.07 % K −1 (298 K) and 15.22 % K −1 (498 K), respectively, via fluorescence intensity ratio (I 400 /I 501 ). Ge/Si substitution enhances Eu 2+ incorporation, elevating luminescence intensity by 282 % and quantum efficiency from 23.6 % to 57.5 %, attributed to suppressed non-radiative losses and modified local lattice symmetry. A white LED fabricated with SGOC:Eu 2+ exhibits exceptional color rendering (Ra = 96). This work highlights the critical role of multi-site engineering in designing high-performance phosphors for ultra-sensitive optical thermometry and efficient solid-state lighting, providing a blueprint for next-generation photonic materials.
研究领域:
材料科学
·
光学材料
·
光子学
·
发光材料
·
固态化学
·
传感器与传感技术
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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）