ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Zhijian Song,Yingliang Liu,Xiaomin Lin,Zhishan Zhou,Xuejie Zhang,Jianle Zhuang,Bingfu Lei,Chaofan Hu
Room-temperature phosphorescence (RTP) with carbon dots (CDs) can be exploited further if the mechanism of trap-state-mediated triplet-state energy transfer is understood and controlled. Herein, we developed an in situ calcination method for the preparation of a CDs@ZnAl2O4 composite material that exhibits unique UV and visible light-excitable ultra-broad-band RTP. The ZnAl2O4 matrix can protect the triplet emissions of CDs by the confinement effect and spin–orbit coupling. In addition, benefitting from the efficient energy transfer between the inorganic trap state and the triplet state of CDs, the special yellow to red RTP of CDs@ZnAl2O4 composites can be realized. A slow-decaying phosphorescence at 570 nm with a lifetime of 1.05 s and a fast-decaying phosphorescence at 400 nm with a lifetime of 0.41 s were observed with UV irradiation of 290 nm, which originated from the surface and core triplet states of CDs, respectively. Based on the unique RTP performance, anti-counterfeiting and information encryption were successfully realized using the CDs@ZnAl2O4 composites with LED light or UV light.
研究领域:
材料科学
·
光电技术
·
纳米技术
✓ 已验证
DOI
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 87
·55489-55495
·
IF 3.108
Yumei Bu,Bin Cui,Weiwei Zhao,Zhenfeng Yang
A carrier possessing simple structure and composition, but with microwave-targeted-fluorescence multifunctional properties to precisely control the delivery of the drug was prepared. Herein, we have constructed the multifunctional Fe3O4@ZnAl2O4:Eu3+@mSiO2–APTES core–shell drug-carrier via direct precipitation method and sol–gel process with surfactant-assistance approach. This carrier is a monodisperse microsphere with an average particle size of 325 nm. Fe3O4 in the core has a high saturation magnetization and provides the Fe3O4@ZnAl2O4:Eu3+@mSiO2–APTES with good drug targeting properties. The ZnAl2O4:Eu3+ interlayer has the characteristic of fluorescent luminescence and can be used to monitor the transport of drugs in the body in real time. In addition, the ZnAl2O4:Eu3+ as a dielectric loss microwave absorbing material combines with the high magnetic loss Fe3O4 to form a composite material, which improved the microwave thermal response. Over 78.2% of VP16 molecules were released under microwave trigger. In addition, mesoporous silica nanoparticles in the outer layer improve the drug loading efficiency through organic modification. The results indicated that this multifunctional drug-carrier with simple structure and composition is a potential controlled drug delivery system in cancer therapy.
研究领域:
材料科学
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纳米技术
·
药学
·
生物医学工程
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产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Siyuan Zhao,Ke Ma,Kailong He,Xiaoxun Ma,Chengyi Dai
Due to cost and energy consumption constraints, converting benzene into ethylbenzene using low-cost syngas instead of ethylene as an alkylation reagent is significant. However, when using syngas as the reaction raw material, generating ethylated side chains on the benzene ring is challenging. Instead, toluene/xylene becomes the primary product. We used a three-bed series connection method in a reactor, achieving one-step high selectivity of syngas and benzene to produce ethylbenzene. In the first bed layer (ZnAl2O4/SAPO-34), the syngas was first converted into methanol/dimethyl ether (DME) on ZnAl2O4. Then, it was further converted into low-carbon olefins on SAPO-34, with the microporous shape-selective effect of SAPO-34, inhibiting the generation of toluene/xylene in the alkylation of benzene with methanol/DME. At the same time, we proved that the absence of microporous shape-selective effect acid sites on the outer surface of S34 can lead to the occurrence of side reactions of benzene and methanol/DME methylation. In the second bed layer, SAPO-34 could continue to convert unconverted methanol/DME in the first bed layer into low-carbon olefins. In the third layer (ZSM-5), ethylene and benzene underwent highly selective alkylation on ZSM-5 to convert it into ethylbenzene. We found a “volcanic” curve relationship between the selectivity of ethylbenzene and the Brønsted acid site density of ZSM-5. On the one hand, Brønsted acid could catalyze the formation of ethylbenzene from benzene and ethylene; On the other hand, excessive Brønsted acid could lead to the isomerization of ethylbenzene to toluene/xylene. When the Brønsted acid showed a site density of 0.7 mmol/g, the selectivity of ethylbenzene was as high as 87%, with a byproduct of xylene showing only 0.3%, which is usually difficult to separate from ethylbenzene. Finally, the three-bed catalytic system showed no deactivation after 100 h.
研究领域:
化学工程
·
催化科学
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产品关联
DOI
高影响因子
Crystals
·
2025
·Vol. 15
·期 7
·623
·
IF 2.4
Xuekai Lan,Bairui Chen,Huatao Tang,Changzhi Yin,Bin Tian,Wen Lei
Microwave dielectric ceramics are indispensable in modern communication technologies, playing a pivotal role in components such as filters, oscillators, and antennas. Among these materials, ZnAl2O4ceramics have garnered attention for their excellent quality factor (Q × f) and low dielectric constant (εr). However, their high sintering temperature (~1650 °C) limits practical applications. This study investigates ZnAl2-x(Zn0.5Si0.5)xO4(ZAZS) (x= 0.1–0.9) ceramics, where [Zn0.5Si0.5]3+substitutes Al3+, to reduce sintering temperature while maintaining high-performance microwave dielectric properties. ZAZS ceramics were synthesized via the solid-state reaction method and characterized for their structural, morphological, and dielectric properties. X-ray diffraction analysis confirmed the formation of a single-phase solid solution up tox= 0.8, with minor secondary phases appearing atx= 0.9. The substitution increased lattice parameters and enhanced material densification, as observed through SEM and relative density calculations. Microwave dielectric measurements showed that ZAZS ceramics achieved a maximumQ × fof 20,200 GHz and aτfvalue reduced to −62 ppm/°C atx= 0.8, whileεrdecreased from 7.90 to 6.98. Bond-valence calculations reveal that the reduction of the average Al/Zn/Si–O bond valence weakens octahedral rigidity, systematically tuningτftoward zero. These results demonstrate that ZAZS ceramics, with a reduced sintering temperature of 1400 °C, exhibit excellent potential for application in low-loss microwave devices.
研究领域:
材料科学
·
电子工程
·
无机非金属材料
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产品关联
DOI
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 12
·3479-3485
·
IF 6.641
Xiaole Yu,Yudong Hou,Haiyan Zhao,Jing Fu,Mupeng Zheng,Mankang Zhu
Based on the strong requirement for self-powered devices, energy harvesting by utilizing piezoelectric materials has recently attracted extensive attention. Transduction coefficient (d33·g33) is the core parameter of the piezoelectric energy harvesting materials, which is directly determined by the ratio of the piezoelectric charge constant (d33) to the dielectric constant (εr). Unfortunately, traditional solid solution design method generally causes a simultaneous increase or decrease in both d33 and εr, making it difficult to obtain a high d33·g33. In this work, a composite design strategy was proposed to separate the synergistic change of d33 and εr. This was achieved by introducing lower-εr ZnAl2O4 secondary phase into the popular 0.2Pb(Zn1/3Nb2/3)O3–0.8Pb(Zr1/2Ti1/2)O3 (PZN–PZT) perovskite matrix. Encouragingly, the εr value rapidly decreased, while d33 value improved within a certain range compared to those of pure PZN–PZT. This was ascribed to the formation of fine domain structures in composites caused by the heterogeneous interfacial effect. Subsequently, the cantilever beam type piezoelectric energy harvesters (PEHs) made from the optimal composites exhibited a high power density of 4.0 μW mm−3 at 1 g acceleration. More importantly, PEHs could harvest vibrational energy from the operating motor to charge a capacitor and instantly drive wireless micro-sensors, demonstrating their potential application in self-powered electronics. Under the guide of the composite design strategy proposed in this work, more high performance piezoelectric energy harvesting materials can be built in the future.
研究领域:
材料科学
·
能源技术
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2015
·
IF 2.999
Xin Ouyang,Songping Wu,Zhuolin Wang,Yunhao Liu
2ZnO⋅3B 2 O 3 -doped ZnAl 2 O 4 ceramics were synthesized via solid-state method. Influence of different 2ZnO⋅3B 2 O 3 additions on the microstructure, sintering behavior and microwave dielectric properties has been investigated. The results showed that zinc borate could effectively improve the densification and expand the sintering temperature range. Microwave dielectric properties of 2ZnO⋅3B 2 O 3 -doped ZnAl 2 O 4 ceramics were exhibited as follow: ε r = 8.32, Q × f = 93,600 GHz (at 14.0 GHz) and τ f = −68.5 ppm/°C. Spinel-structured zinc borate-doped ZnAl 2 O 4 ceramics possessed comparatively low sintering temperatures, wide temperature regions (about 100 °C), simultaneously, high Q × f and stable τ f values. These outstanding performance make them promising candidate materials for millimeter-wave devices at high frequency.
研究领域:
材料科学
·
无机化学
✓ 已验证
DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 12
·2626
·
IF 4.6
Minhui Pan,Linlin Zheng,Congyu Cai,Weiwei Wang
The photocatalytic reduction of CO2into valuable hydrocarbons presents significant potential. In this research, a ZnO/ZnAl2O4composite photocatalyst was synthesized using the hydrothermal method, resulting in a marked enhancement in CO yield—approximately three times greater than that achieved with pure ZnAl2O4nanoparticles. The formation of a Z-scheme heterojunction between ZnO and ZnAl2O4was observed, characterized by low interfacial charge transfer resistance, an abundance of reaction sites, and optimized charge transport pathways. Within this composite, ZnO contributes additional vacancies, thereby increasing active sites and enhancing the separation and migration of photogenerated carriers. In situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) analysis indicates that ZnAl2O4facilitates the formation of key intermediates, such as *COOH and HCO3−, thus promoting the conversion of CO2to CO. This study offers valuable insights into the design of heterogeneous catalysts with diverse active components to enhance the performance of CO2photocatalytic reduction through synergistic effects.
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产品关联
DOI
PubMed
高影响因子
SN Applied Sciences
·
2020
·Vol. 2
·期 5
·1-10
·
IF 0
Putra Ageng Trisna Surya Pradana
A spinel structure of zinc aluminate (ZnAl 2 O 4 ) particles provides a prospective material for photocatalytic applications. In this work, zinc aluminate spinel was prepared by an anion-exchange method derived from layered double hydroxides (LDHs) followed by thermal treatment. The mechanism, photoactivity, and effects of both anion substitute and temperature have been investigated. The chemical composition, morphologies, phase structures, porous structures and photocatalytic properties of samples were analyzed using thermogravimetric analysis, scanning electron microscopy, energy-dispersive X-ray spectroscopy, powder X-ray diffraction, gas sorption analysis, and ultraviolet–visible spectroscopy in detail. The results of mesoporous α -ZnAl 2 O 4 indicate that average crystallite size, total pore volume, and BET surface area obtain 9.3 nm, 0.337 cm 3 /g, and 206.13 m 2 /g, respectively. Moreover, zinc aluminate spinel shows well phase after heating at 700 °C and LDHs structures were completely collapsed. The photocatalytic performances of α -ZnAl 2 O 4 have been applied in p -nitrophenol reduction under visible light irradiation and required time at least 9 min. Finally, the new improved method constructs an excellent material for pretreatment of liquid pollutants containing high-level concentration at rapid treatment time.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
OPTICAL MATERIALS
·
2023
·
IF 3.9
Jiao Qu,Binquan Zhao,Qi Zhu
In the field of information encryption, multi-mode luminescent materials that can emit light in response to different forms of excitation are very important. Here, ZnAl 2 O 4 : x Ti 4+ ( x = 0, 0.25%, 0.5%, 0.75%, 1%, 1.25%) and ZnAl 2 O 4 :1%Ti 4+ , y Cr 3+ ( y = 0.1%, 0.2%, 0.3%) optical materials were synthesized by solid-state reaction method. The crystal structure does not significantly change after doping Ti 4+ and Cr 3+ . The single-doped Ti 4+ samples output blue light at 440 nm. Further doping Cr 3+ with y = 0.1%, 0.2% and 0.3%, the emission color shifts from blue to red under 254 nm excitation. There is energy transfer of Ti 4+ →Cr 3+ , and the largest efficiency is 54.0% at y = 0.3%. Because the thermal stabilities of emissions for Ti 4+ and Cr 3+ are quite different, the emissions at 440 nm (Ti 4+ ) and 700 nm (Cr 3+ ) exhibit significantly different responses to temperature. Furthermore, varying the excitation lights from 254 nm to 365 nm also yields different light outputs. Finally, three typical samples were designed for letters “CHN”. The “CHN” logo outputted lights of different colors at different temperatures, and the optical signals varied under different excitations. The colorful emission with different modes can be coded to achieve the application of multi-mode anti-counterfeiting, indicating that they have broad application prospects in this area.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2026
·
IF 6
Chanjuan Pan,Yao Zhang,Jingtao Zhao,Kunyang Wang
Persistent luminescence (PerL) materials have garnered immense research interest on account of their distinctive luminescent features, and the rational design of such materials together with the elucidation of their underlying PerL mechanisms remain prominent research frontiers. Nevertheless, realizing tunable multicolor PerL within a single-phase material still poses a formidable challenge. Herein, we develop a novel Mn 2+ -doped germanate glass and glass ceramic (GC) with tunable PerL. In the pristine glass, abundant oxygen vacancy defects enable intense red PerL with a persistence time exceeding 420 s. After heat treatment, ZnAl 2 O 4 nanocrystals are homogeneously precipitated within the glass matrix, accompanied by the generation of new defects; as a result, the derived GC material exhibits green PerL that also persists over 420 s. Owing to divergent excitation spectral profiles of Mn 2+ centers residing in these two dissimilar coordination environments, the GC sample achieves reversible green-to-red PerL emission simply by modulating the excitation wavelength. Benefiting from such unique luminescence behaviors, the as-fabricated glass and GC show great promise for applications in emergency illumination, information display, and advanced optical anti-counterfeiting. Beyond reporting a facile strategy for multicolor PerL material construction, this work also provides fundamental guidance for defect engineering and emission color manipulation of future PerL systems.
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·Vol. 50
·期 15
·26493-26502
·
IF 5.1
Lan Zhang,Meihui Xiao,Jiali Li,Lin Chen,Jun Sun,Jianjun Ding,Xiaoxiao Li,Yi Gong,Kang Zheng,Xian Zhang,Xingyou Tian
The Bi 2 O 3 –B 2 O 3 –SiO 2 –ZnO–Al 2 O 3 (BBSZA) glass/Al 2 O 3 composites are prepared by quenching and quenching-free methods and conducted a comparative analysis of their microstructures and properties. The results reveal that the BBSZA/Al 2 O 3 composite obtained by quenching free method has smaller pores and superior performance. Specifically, at a BBSZA content of 50 wt%, the composite exhibits a thermal conductivity of 5.352 W/m·K and a flexural strength of 193.54 MPa, which are 1.38 times and 2.08 times those obtained using the quenching method, respectively. XRD and TEM analyses , along with parallel experiments using other glasses, suggest that presintering crystallization may be the prerequisite for achieving denser composites via the quenching-free method. BBSZA glass reacts with Al 2 O 3 at the presintering process to generate a great amount of ZnAl 2 O 4 crystals, which enhances grain boundary energy and increases sintering density. This work provides insights into the low-cost and high-performance development of low temperature co-fired ceramics (LTCC).
研究领域:
材料科学
·
无机非金属材料
·
陶瓷学
·
复合材料工程
·
电子封装材料
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Dan Liu,Shizhi Tan,Xujia Pan,Fei Mao,Haojie Qian,Zebo Wu,Huibin Yin,Shiyuan Gao,Yongjun Xu
Cu-based catalysts are prone to sintering and deactivation under the high-temperature conditions of methanol aqueous-phase reforming of methanol (APRM). ZnAl 2 O 4 spinel has attracted much attention due to its flexible surface properties and tunable structural composition. Therefore, this study proposes a dual-modification strategy involving the incorporation of ZnO nanosheets and sesbania powder(SP)-derived carbon species on ZnAl 2 O 4 spinel support, thereby promoting the highly dispersed distribution of Cu nanoparticles and preparing a Cu/ZnO–ZnAl 2 O 4 –C catalyst (CZZAC). The H 2 production rate of the CZZAC catalyst is 66.22 μmolH 2 /g cat ./s under 210 °C. Based on the TPSR characterization analysis of the APRM reaction path, the results show that the CZZAC catalyst begins to produce hydrogen at 145 °C and follows the reaction path of the methyl formate intermediate product. This research has prepared a novel spinel nanosheet, demonstrating its effectiveness in preparing highly dispersed Cu catalysts, and providing a practical and economical alternative to noble metal catalysts.
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DOI
高影响因子
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