INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
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2022
·Vol. 24
·期 1
·504
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IF 6.208
Zhilan Du,Dashuang Wang,Xinfang Zhang,Zhiyu Yi,Jihai Tang,Pingan Yang,Rui Cai,Shuang Yi,Jinsong Rao,Yuxin Zhang
In this work, a novel core-shell structure material, NiFe layered double hydroxide (NiFe LDH) loaded on SiO2microspheres (SiO2@NiFe LDH), was synthesized by a one-step hydrothermal method, and the spontaneous electrostatic self-assembly process. The morphology, structure, and microwave absorption properties of SiO2@NiFe LDH nanocomposites with different NiFe element ratios were systematically investigated. The results show that the sample of SiO2@NiFe LDH-3 nanocomposite has excellent microwave absorption properties. It exhibits broadband effective absorption bandwidth (RL < −10 dB) of 8.24 GHz (from 9.76 GHz to 18.0 GHz) and the reflection loss is −53.78 dB at the matched thickness of 6.95 mm. It is expected that this SiO2@NiFe-LDH core-shell structural material can be used as a promising non-precious, metal-based material microwave absorber to eliminate electromagnetic wave contamination.Keywords:SiO2microspheres;LDH;microwave absorption;core-shell structure
研究领域:
材料科学
·
电磁学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Jinrong Gao,He Bai,Xiao Ling,Yunjiang Yang,Xinru Liu,Zhipeng Fan,Jinrong Bao,Wenxian Li,Ying Liu,Xiaowei Zhu
A rare earth organic complex, SiO 2 @ATPA-Si-RE (RE = Eu, Tb), exhibiting a core-shell structure, was synthesized using the ligand (HOOC) 2 C 6 H 3 NHCONH(CH 2 ) 3 Si(OCH 2 CH 3 ) 3 (ATPA-Si) to connect the silica microspheres core and coordinate with rare earth ions. The pH value of the reaction was adjusted to produce organic complex shells with thicknesses of 2.0 nm and 5.0 nm, while the SiO 2 core measured a diameter of 125 nm. Luminescence spectra indicated that the emission intensity of the SiO 2 @ATPA-Si-RE (RE = Eu, Tb) core-shell structure was stronger than that of the ATPA-Si-RE organic complex due to a perfect match between the triplet energy level of SiO 2 @ATPA-Si and the excited energy level of rare earth ions (Eu 3+ , Tb 3+ ). Remarkably, the core-shell structure with a 2.0 nm shell thickness possessed a greater emission intensity compared to the 5.0 nm shell thickness. Moreover, these findings unveiled the tunability of luminescence color, ranging from green or red to white, by adjusting the doping ratio of Eu 3+ and Tb 3+ ions and the coating thickness of complexes. Particularly, a warm white light emission, characterized by CIE coordinates (0.389, 0.347), a color rendering index value of 86.7, and a low correlated color temperature value of 3550 K, was achieved using the organic complex with a 2.0 nm thickness coated on SiO 2 microspheres with a doping ratio of Eu 3+ at 0.7 mmol and Tb 3+ at 0.3 mmol. Conversely, the complexes with a 5.0 nm coating thickness and Tb 3+ doping ratio of 0.3 mmol yielded a cold white light emission. These findings demonstrate the potential applications in next-generation lighting industry and display systems.
研究领域:
材料科学
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光学
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Peijun Liu,Wenjie Zhang,Da Chen,Lili Yang
Lanthanum doped MgTiO 3 (La–MgTiO 3 ; n (La): n (Mg) = 0.05:0.95) was synthesized using a sol–gel method, and a layer of this material was supported on quartz microspheres to produce La–MgTiO 3 ( x% )/SiO 2 microspheres (LMTO( x% )/SiO 2 ; where x% represents the weight fraction of La–MgTiO 3 in the microspheres). The crystal size of MgTiO 3 decreased from 43.4 nm in La–MgTiO 3 to 29.2 nm in LMTO( 20 % )/SiO 2 , and the bandgap energies increased from 3.34 eV (La–MgTiO 3 ) to 3.91 eV (LMTO( 20 % )/SiO 2 ). The supported La–MgTiO 3 contributed the most to the total surface area of the LMTO( x% )/SiO 2 microspheres; further, the specific surface area of the microspheres decreased with decreasing La–MgTiO 3 content. The photoluminescence intensity of the microspheres was significantly lower than that of La–MgTiO 3 . The activity of La–MgTiO 3 was enhanced after loading onto the quartz microspheres. The maximum photocatalytic activity was obtained using LMTO( 40 % )/SiO 2 , while the azophloxine degradation efficiency slightly decreased after five reaction cycles.
CAS / MDL:
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2023
·
IF 6.2
Dian Wang,Xiang Wan,Jiafei Wang,Debby Mangelings,Qin Xu,Fazhi Xie,Xianhuai Huang,Weihua Li,Han Xuan,Wensheng Zou,Qishu Qu
Background Due to its high chemical stability, sufficient rigidity and zwitterionic ion exchange properties, TiO 2 can be considered as an alternative stationary phase material to SiO 2 for high performance liquid chromatography . TiO 2 stationary phase is usually prepared by coating TiO 2 onto SiO 2 support by sol-gel method. However, in the traditional coating method, in order to overcome the rapid hydrolysis rate of tetrabutyl orthotitanate, only a very low concentration of tetrabutyl orthotitanate can be used, resulting in a low loading of TiO 2 on the support. Results TiO 2 core-shell spheres with a good monodispersity were prepared using 0.25 mol L −1 tetrabutyl orthotitanate. The specific surface area, pore volume , pore diameter and TiO 2 loading of the TiO 2 core-shell spheres were 66 m 2 g −1 , 0.15 cm 3 g −1 , 9.8 nm and 57%, respectively. The core-shell spheres were derivatized with n-octadecyltrichlorosilane and then packed into a stainless steel column to test the separation performance for neutral, basic and acidic samples in liquid chromatography. A baseline separation of polyaromatic hydrocarbons was achieved, showing a column efficiency for fluorene of 118075 plates m −1 . The prepared stationary phase was also used to separate acidic and basic mixtures, and column efficiencies of 54500 and 25836 plates m −1 were obtained for N , N -dinitroaniline and p -chlorophenol, respectively. The relative standard deviations of the retention times of polyaromatic hydrocarbons for run-to-run, day-to-day and column-to-column repeatability were all below 5.1%. Significance and novelty This work demonstrated that TiO 2 can be coated in the pores of the shell of SiO 2 core-shell spheres with high TiO 2 loading using a high concentration of tetrabutyl orthotitanate as the titania source. The experimental results show that the TiO 2 coated core-shell spheres can be a good alternative stationary phase for liquid chromatography.
研究领域:
分析化学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Materials Research Express
·
2017
·Vol. 4
·期 12
·125503
·
IF 1.068
Jiaxi Liu,Gang He,Nan Lu,Jiangtao Li
Photo-absorption enhanced black TiO2–SiO2 microspheres were prepared by flame spraying synthesis. The phase composition, microstructure, infrared absorption, and emission property of the synthesized samples were investigated. Compared with the rutile TiO2 raw material, the visible light and near-infrared absorptivity of the flame sprayed TiO2 is significantly enhanced. The addition of SiO2 promotes the rutile-to-anatase phase transformation and appearance of Ti3+ species. The prepared sample with a composition of 40 at.% TiO2–60 at.% SiO2 exhibits the highest absorption of above 95% in 0.79–2.5 µm, and the highest emissivity of above 0.96 in 3–5 µm and 8–14 µm. The black TiO2–SiO2 microspheres with enhanced photo-absorption properties can be used as a promising optical-thermal conversion material.
研究领域:
材料科学
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光学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 19
·2200571
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IF 6.389
Tingyu Yang,Yihua Zhu,Xiaoling Yang,Jianhua Shen
Perovskite quantum dots (PQDs) have attracted widespread attention in optoelectronic fields due to their excellent optical properties. However, their instability issue hampers their further development and practical application. Herein, CsPbBr 3 PQDs embedded in mesoporous SiO 2 microspheres (CsPbBr 3 PQDs/MSs) are prepared by the high-temperature solid-phase melting method due to the confinement effect. The prepared CsPbBr 3 PQDs/MSs are treated by saturated Na 2 SO 4 to form PbSO 4 precipitation to fulfill the mesoporous gap. And such treatment endows the QDs with excellent water, light irradiation, and heating stability. The prepared products can maintain over 80% of the original fluorescence intensity even when it is immersed in water for 2 weeks. The CsPbBr 3 PQDs/MSs are utilized in the white light-emitting diode device with Commission Internationale de L'Eclairage color coordinates of (0.3407, 0.3357) at 20 mA, and exhibit excellent photo stability at high power.
研究领域:
材料科学
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光学工程
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纳米技术
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产品关联
DOI
高影响因子
Optical Materials Express
·
2022
·Vol. 12
·期 2
·479-488
·
IF 3.074
Jiling Xue,Jiling Xue,Zhaomin Tong,Zhaomin Tong,Yifei Ma,Yifei Ma,Mei Wang,Mei Wang,Suotang Jia,Suotang Jia,Xuyuan Chen,Xuyuan Chen,Xuyuan Chen
Volume scattering diffusers (VSDs) with different thicknesses were fabricated for speckle reduction investigation in a two-diffuser system. The VSDs were obtained by spin-coating the mixture of SiO2 microspheres and SU-8 photoresist, where the monodispersed SiO2 microspheres were synthesized by the Stöber method with an average diameter of 1.43 µm. The Mie scattering effect of the VSDs was observed owing to the refractive index difference between the SiO2 microspheres and the SU-8 photoresist. The speckle reduction effect of the two-diffuser system comprising cascaded stationary and moving VSDs was experimentally studied. The result can be used in designing more effective speckle reduction techniques in laser displays.
研究领域:
光学工程
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材料科学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2022
·
IF 9.965
Chaohu Xiao,Qimeige Hasi,Shanshan Wang,Yuhan Zhang,Hailing Li,Lu Zhang,Lihua Chen,An Li
Solar steam generation (SSG) is one of the promising technologies for seawater desalination and contaminated water purification . However, SSG devices are always restricted by poor insulation performance, insufficient solar spectrum absorption and serious salt-fouling. Here, a double-layered novel SSG system was fabricated by using poly(ionicliquid)s gels with hollow SiO 2 microspheres in-situ doping to enhance the thermal insulation of lower layer, and co-modified the top surface by polypyrrole (PPy) and silver particles to strengthen the solar absorption capability. Benefiting from the low thermal conductivity (0.082 W m −1 k −1 ), strong light absorption ( ca . 96%) and adequate water transport capability of poly(ionic liquid)s gels. As SSG device, a superb photothermal conversion efficiency of 90.5% is achieved under 1 sun illumination. Moreover, the poly(ionic liquid)s gels based SSG system also shows good desalination performance in artificial sea water and high concentration brine, and the purified water from artificial seawater can achieve the WHO's standard for drinking water . Therefore, this work combined attractive in-situ doping and co-modified strategies for fabricating high performance and thus shows significant potential for real applications.
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
ACS Sensors
·
2020
·
IF 7.333
Xing Lu,Guobao Zhou,Jian Zhang,Wei Xie,Yiwen Yang,Yanbo Zeng,Zulei Zhang,Hailong Wang,Lei Li
A novel SiO2@ MIPIL fluorescence sensor for the highly sensitive detection of 2,4,6-trichlorophenol was prepared by using surface molecularly imprinting technology with SiO2 microspheres as carriers and 3,3′-(anthracene-9,10-diylbis(methylene))bis(1-vinyl-1H-imidazole-3-ium) chloride as a double recognition fluorescence functional monomer. The prepared molecularly imprinted polymer (SiO2@MIPIL) was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, laser confocal microscopy, and nuclear magnetic resonance. Compared with the polymer obtained via bulk polymerization (MIPIL), the surface molecularly imprinted polymer (SiO2@MIPIL) has a better linear range (0.1–50 nM), lower detection limit (89 pM), and shorter detection time (approximately 1.5 min). The fluorescence sensor also shows good specificity, high sensitivity, good stability, and reusability. Satisfactory results were obtained when using this sensor in industrial wastewater and spiked environmental water.
研究领域:
分析化学
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环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
GREEN CHEMISTRY
·
2025
·
IF 9.2
Man Yang,Shuhao Qin,Youchang Yang,Mingmi Wu,Ting Lei,Yufei Liu,Huiju Shao
Owing to the global transition toward carbon neutrality, lithium-ion batteries (LIBs) are experiencing unprecedented demand growth as key energy storage components. A contact-electro-catalysis (CEC) method has been utilized in recycling spent LIBs for some time due to the process economy, efficiency and environmental sustainability. However, systematic investigations into the effects of the microstructure and surface chemical environment of dielectric materials on their catalytic activity in the CEC process remain scarce. Here, we demonstrated that the metal leaching efficiency simultaneously depended on the size and porous structure of SiO2 microspheres. Appropriate size and narrow distribution could dominantly diminish the scattering intensity of ultrasonic waves to gather energy and then facilitate the formation of cavitation bubbles to generate abundant electrons and radicals. Similarly, the porous structure also promoted the generation of electrons and radicals by enhancing aqueous-phase contact interfaces. Moreover, we manipulated the surface chemical environment of porous SiO2 microspheres by incorporating sodium alginate (SA) and polyethyleneimine (PEI). Hydroxyl, carboxyl and amino groups and –COO−/–NH3+-microstructures not only accelerated electron transfer from water molecules to SiO2 microspheres, inducing hydroxyl radicals, but also boosted electron transfer from SiO2 microspheres to O2, generating superoxide radicals. Consequently, under the experimental conditions established in this study, approximately 100% leaching efficiency of metals in the spent ternary cathode was achieved in 8 h at 80 °C due to the synergistic effect of hydroxyl and superoxide radicals. We anticipate this innovative strategy will significantly expand the applicability of CEC in LIB recycling, thereby addressing the growing global demand for sustainable LIBs.
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DOI
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Yawei Wang,Qiaoling He,Yamei Hao,Xue Ji,Tian Wu,Jie Li,Chengjia Xiong
Vertical deposition method is a simple, cheap and common method for fabricating photonic crystals (PCs). However, a majority of PCs are obtained based on the traditional vertical deposition method from one glass slide, the method is low efficiency. Herein, it is proposed to efficiently fabricate uniform PCs by an optimized vertical deposition method from double or multiple glass slides of simple moulds. Amounts of SiO 2 spheres, distances of two glass slides of moulds, preparation temperatures and different diameters of SiO 2 spheres are investigated for obtaining uniform PCs. And different types of PCs (the bottom-middle-top 3D PCs, bilayer 2D PCs and amorphous PCs) are also fabricated based on the optimized vertical deposition method. The above method is a simple, cheap and high-efficiency way for mass production of uniform PCs. Meanwhile, the chemicals with similar refractive indices (isomers and cis-trans isomers) can be easily distinguished under high humidity based on dynamic reflection spectra of the PCs. For example, the difference in the refractive indices of m - xylene and p - xylene is only 0.002, the difference of desorption balance time of PCs is 263 s. The PCs have potential applications in visual detections, isomer recognitions and monitoring of volatilization rates of trace liquids.
研究领域:
材料科学
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光学
·
化学传感器
✓ 已验证
产品关联
DOI
高影响因子
Molecular Catalysis
·
2024
·
IF 3.9
Yuqiu Wu,Fanjin Meng,Jiaolong Fu,Yuyang Zhou,Huan Fan,Xin Ju,Liangzhi Li
D-xylose, a biomass derivative, is used as a substrate to generate D-xylulose and D-ribulose with high-added value through a cascade reaction. During this process, the thermal stability and catalytic efficiency of rate-limiting enzymes during cascade reactions are important issues that must be addressed in industrial applications. In this study, we prepared and validated PDA/SiO 2 microspheres as highly loaded immobilization carriers by oxidative self-polymerization of polydopamine (PDA) on silica (SiO 2 ) microspheres. D-xylose was successfully catalyzed by the co-immobilized D-5-phosphate ribose isomerase B (RpiB) and D-tagatose-3-epimerase (DTE), denoted PDA/SiO 2 -RpiB-DTE, to produce D-ribulose and D-xylulose. After immobilization, the K m of co-immobilized RpiB and DTE decreased, which suggested increased substrate affinity. The half-life of the co-immobilized enzymes was 3.5–8 fold higher than that of the free enzymes at 50–70 °C, and the inactivation rate constant was reduced, demonstrating that immobilization improved significantly the thermal stability. The conversion of D-xylose at 10 mM was 29.98% under optimal conditions, which contained 9.85% D-ribulose and 20.13% D-xylulose. PDA/SiO 2 -RpiB-DTE showed up to 89.10% initial enzyme activity after 3 recycle runs. The thermal stability and recovery aspects were improved by immobilization, which facilitates the use of biomass to produce high-value-added products and further exploitation.
研究领域:
生物技术
·
酶工程
·
生化工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）