CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Hao Liu,Ying Zhang,Liyang Liu,Tianxiang Chen,Xingcong Zhang,Peng Hu,Chao Xiong,Jie Zhou,Hao Zhang,Lihui Dong,Tsz Woon Benedict Lo,Bing Nan,Xiaohui He,Hongbing Ji
Dispersing metals from nanoparticles to clusters is often achieved using ligand protection methods, which exhibit unique properties such as suppressing structure-sensitive side reactions. However, this method is limited by the use of different metal precursor salts corresponding to different ligands. An alternative approach, the ion exchange (IE) method, can overcome this limitation to some extent. Nevertheless, there is still an urgent need to address the stabilization of metals (especially precious metals) by using IE method. Here, we reported a Pt cluster catalyst prepared mainly by anchoring Pt atoms via O located near the framework Zn in zincosilicate zeolites and riveted by zeolite surface rings after reduction (reduced Pt/Zn-3-IE). The catalyst can achieve an initial propane conversion of 26% in a pure propane atmosphere at 550 °C and shows little deactivation even after 7.5 d of operation. Moreover, the alteration of catalyst by the introduction of framework Zn was also highlighted and interpreted.
研究领域:
催化
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材料科学
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化学工程
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纳米技术
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产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2024
·
IF 1.8
Zhuo Xing,Julong Song,Hong Pan
The zinc orthosilicate, Zn 2 SiO 4 ceramics, exhibit great potential as microwave dielectric materials due to their low dielectric constant and ultrahigh quality factor. The solid-state synthesis of Zn 2 SiO 4 ceramics often results in the presence of a secondary phase of ZnO, however, leading to significantly lower Q × f values. Cold-isostatic-pressing (CIP) and nonstoichiometry have been proven effective in purifying the Zn 2 SiO 4 but need elaborate process and composition manipulation. In this work, it was found that the particle size of SiO 2 plays a crucial role in purifying the Zn 2 SiO 4 phase. Specially, nano-sized SiO 2 particles (15 and 30 nm) led to the formation of a ZnO secondary phase in synthesized Zn 2 SiO 4 ceramics, while micro-sized (2 and 10 µm) resulted in pure-phase Zn 2 SiO 4 with excellent microwave properties. Notably, when prepared with 10 µm SiO 2 and sintered at 1 340°C, the resulting Zn 2 SiO 4 exhibited outstanding microwave performances with a Q × f value of 122 570 GHz, a temperature coefficient of frequency τ f of −51.9 ppm/°C, and a dielectric constant ( ε r ) of 6.5. These findings highlight the importance of controlling particle size during synthesis to achieve desired material properties such as purity and excellent microwave performances.
研究领域:
材料科学
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电子工程
✓ 已验证
产品关联
DOI
高影响因子
MICROPOROUS AND MESOPOROUS MATERIALS
·
2016
·
IF 3.349
Wenbo Wang,Guangyan Tian,Li Zong,Qin Wang,Yanmin Zhou,Aiqin Wang
A hierarchical mesoporous hybrid Zn-silicate adsorbent with superior adsorption performance for aureomycin (AMC) and tetracycline (TC) has been successfully synthesized by employing an “all-into-one” strategy and one-pot hydrothermal reaction , using naturally abundant, low-cost red palygorskite clay (RPAL), sodium silicate and zinc salts as raw materials. The morphologies and crystal forms of the Zn-silicates can be tuned by altering the dosage of Zn 2+ ions. Low-crystalline sheet-like Zn-silicates were formed at the Si/Zn ratio of 3:1 and 2:1, and zinc orthosilicates were obtained at the Si/Zn ratio of 1:1 and 1:2. A systematic study on their adsorption abilities for the antibiotics AMC and TC indicates that the sheet-like Zn-silicate has higher adsorption capacity for AMC and TC than zinc orthosilicate, and the Zn-silicate with Si/Zn ratio of 3:1 has the best adsorption capacity of 384 mg/g for AMC and 337 mg/g for TC, which is obviously higher than that of RPAL (154 mg/g for AMC and 140 mg/g for TC). The adsorption properties are dependent on the pore size and surface charges, instead of specific surface area. The average pore sizes of 10.62–11.50 nm and the negative surface charge (−42.54 mV) resulting from the –Si(M)O − groups are beneficial to the adsorption for both AMC and TC. The adsorption process mainly involves with monolayer coverage, and chemo-adsorption plays a key role for the enhanced adsorption capacity. The results suggest that the Zn-silicates derived from natural abundant clay mineral have superior performance, and could be candidates to remove AMC and TC from the wastewater with high amounts of AMC and TC.
研究领域:
环境科学
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材料科学
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产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
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IF 4.9
Chang Chen,Feifei Peng,Ruyi Zhang,Shaowu Jiu,Yanxin Chen
Organic coatings cannot provide long-term corrosion protection to steel bars in sand-based autoclaved aerated concrete because they are prepared at high temperatures and pressures. Herein, potassium silicate, zinc silicate, and aluminum powder were used as the raw materials to prepare inorganic aluminum powder–modified zinc silicate–potassium silicate coatings with anticorrosive properties. The physical, mechanical, microscopic, and anticorrosion properties of the prepared inorganic coatings were investigated using X-ray diffraction, Fourier-transform infrared spectroscopy, Raman spectroscopy , thermogravimetry–differential scanning calorimetry, scanning electron microscopy, electrochemical impedance spectroscopy , and potentiodynamic polarization. The results showed that aluminum powder increased the density of the zinc silicate–potassium silicate coatings and significantly improved the corrosion resistance and mechanical properties of the coatings. The prepared coatings exhibited stable qualities with no heat absorption and release before 317°C. The adhesive strength and impact resistance of the coatings were as high as 1.65 MPa and 50 kg·cm, respectively. The electrochemical test results showed that the coating resistance ( R c ), charge-transfer resistance ( R ct ), and polarization resistance ( R p ) of the 5.5–50Zn 2 SiO 4 –40Al coating were 7835, 135,915, and 89,568 Ω·cm 2 , respectively, which exhibited the optimal corrosion resistance.
研究领域:
材料科学
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腐蚀与防护
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 64
·37355-37364
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IF 3.049
Yun Chen,Wenge Qiu,Jiayuan Sun,Shining Li,Guangmei Bai,Shenghua Li,Chenghui Sun,Siping Pang
A reliable in situ self-generating template strategy has been developed for the synthesis of flowerlike carbon nanosheets by hydrothermal carbonization in the presence of both silica and zinc acetate using glucose as the carbon source. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), atomic force microscopy (AFM), powder X-ray diffraction (XRD), Raman spectroscopy, nitrogen sorption isotherm measurement (BET) and element analysis revealed the morphology, crystal phase structure, porosity and chemical composition. The formation of the zinc silicate nanosheet template was due to the hydrolysis of amorphous silica and self-assembly under hydrothermal conditions. The resulting flowerlike carbon nanosheets proved to be an excellent palladium catalyst support.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Xueli Hu,Yuanhang Zhou,Yingying Zhou,Yun Bai,Ruiting Chang,Peng Lu,Zhi Zhang
Under the new crown pneumonia (COVID-19) epidemic, the intensive use of therapeutic drugs has caused certain hidden danger to the safety of the water environment. Therefore, the core-shell microporous zinc silicate (SiO 2 @ZSO) was successfully prepared and used for the adsorption of chloroquine phosphate (CQ), tetracycline (TC) and ciprofloxacin (CIP) for eliminating the threat of COVID-19. The adsorption efficiencies of 20 mg L −1 of CQ, TC and CIP by SiO 2 @ZSO were all up to 60% after 5 min. The adsorption capacity of SiO 2 @ZSO for CQ, TC and CIP can reach 49.01 mg g −1 , 56.06 mg g −1 and 104.77 mg g −1 , respectively. The adsorption process is primarily physical adsorption, which is heterogeneous, spontaneous and preferential. Moreover, the effects of temperature, pH, salinity, and reusability on the adsorption of CQ, TC, and CIP on SiO 2 @ZSO were investigated. The adsorption mechanism mainly involves electrostatic attraction, partitioning and hydrogen bonding, which is insightful through the changes of the elements and functional groups before and after adsorption. This work provides a solution to the problems faced by the treatment of pharmaceuticals wastewater under the COVID-19 epidemic.
研究领域:
环境科学
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材料科学
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公共卫生
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2017
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IF 4.162
Yueyuan Li,Lihui Tian,Li Liu,Malik Saddam Khan,Guanhui Zhao,Dawei Fan,Wei Cao,Qin Wei
In this study, described an electrochemical immunoassay for insulin that is based on the use of zinc silicate spheres loaded with palladium nanoparticles (Zn 2 SiO 4 -PdNPs) that act as dual-function labels. The Zn 2 SiO 4 -PdNPs display high electrocatalytic activity towards the reduction of H 2 O 2 and high sensitivity in chronoamperometry . The Zn 2 SiO 4 -PdNPs decrease the electron transfer rate between the electrolyte and the surface of the electrode, which can increase the changed current and enhance the sensitivity of the immunosensor as detected by square wave voltammetry (SWV). Electrodeposited gold is used as the matrix material. The icosahedral gold nanocrystals are coated with the primary antibodies formed a 3D mode to against abundant of insulin. Under optimal conditions, the assay has a linear response in the 0.1 pg mL −1 to 50 ng mL −1 insulin concentration range, and the limit of detection of the SWV and CA methods are 0.25 fg mL −1 and 80 fg mL −1 , respectively. Moreover, the immunosensor holds an outstanding analytical performance for the insulin detection and has promising potential in clinical diagnosis.
研究领域:
生物医学工程
·
分析化学
✓ 已验证
DOI
PubMed
高影响因子
OPTICAL MATERIALS
·
2024
·
IF 3.8
Jing Yang,Li Li,Jie Wang,Meng Li,Hongxi Zhang,Liang Wei,Xiande Yang
Hybridized zinc silicate adsorbent (Zn–Si/(I/S)) with excellent adsorption property was synthesized by hydrothermal-roasting process based on Illite/Smectite (I/S) clay. The morphological structures and elemental compositions of adsorbents were analyzed by various characterization techniques, and the Zn–Si/(I/S) adsorbent had a 2-D film-like structure. In addition, the average pore size was obviously increased. The Zn–Si/(I/S) adsorbent had a good adsorption performance for cationic dyes and antibiotics, and the adsorption process was influenced by the structure, pore size, type and surface groups of the pollutants. The results of adsorption isotherm, kinetic and thermodynamic model fitting showed that: i) the adsorption performance depended on the pore size and surface charge rather than the specific surface area, ii) the proposed second-order kinetic model and Freundlich isotherm model fitted the adsorption process of RhB better, iii) the thermodynamic analysis proved that the adsorption process proceeded spontaneously by heat absorption. In summary, the adsorption mechanism was controlled by electrostatic attraction, chemical conjugation, ion exchange, hydrogen bonding interactions and pore adsorption.
研究领域:
材料科学
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环境科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
OPTIK
·
2015
·
IF 0.677
Xijia He,Xuhui Xu,Cuiqiong Yan,Jianbei Qiu
Bi-doped zinic silicate glasses (SG) and germanate glasses (GG) were prepared and the relationship between Bi near infrared (NIR) luminescence and the glass structures were investigated. The absorption, visible luminescence, and X-ray photoelectron spectroscopy (XPS) spectra revealed that the lower valence state of Bi ions containing NIR active centers increased with the decrease of optical basicity in the two sets of glasses. However, the NIR emission in these glasses cannot be merely explained by the theory of optical basicity. In the SG glasses, there is no obvious structural change, the NIR luminescence can be well interpreted by theory of optical basicity. But there is a distinct transformation in the GG glasses, the abnormal fluorescence phenomenon can be connected with the local structure regulating effect. The mechanisms of the NIR emission and local structure regulating effect were discussed.
研究领域:
材料科学
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光学
✓ 已验证
产品关联
DOI
高影响因子
VIEW
·
2025
·
IF 8.5
Na Sun,Zhaowenbin Zhang,Jiajing Wang,Yuan Yang,Jianhui Wang,Tianxing Chen,Yiqi Wang,Haodong Xiao,Ping Gu,Zhaoyang Wang,Jiang Chang,Jing Ji
Retinal degenerative diseases, primarily owing to the gradual loss of neuronal cells, could lead to blindness. Transplantation of retinal progenitor cells (RPCs), which had the unique ability to differentiate into neuronal cells, offered promising therapeutic potential for these diseases. However, a critical challenge in stem cell therapy was the efficient promotion of the directed proliferation and differentiation of progenitor cells. To overcome this limitation, we formulated a zinc silicate bioceramic (ZS) composite hydrogel. The experimental outcomes demonstrated that this novel material possessed substantial advantages and immense possibilities for mimicking the extracellular matrix environment, thereby effectively modulating stem cell proliferation and differentiation. Notably, it enhanced the differentiation of RPCs into neurons while suppressing glial cell differentiation. In particular, ZS had an exceptional capacity to induce the differentiation of RPCs into photoreceptor cells, a specialized type of neuronal cell. It was important to highlight that the ZS composite hydrogel predominantly facilitated the differentiation of RPCs through activation of the Tiam2-Rac signaling pathway. Concurrently, it stimulated proliferation via activation of the AKT and ERK signaling pathways. The Zn ions in the ZS composite hydrogel primarily promoted the proliferation of RPCs, while the synergistic effect of Zn ions and Si ions contributed to reducing inflammatory factor expression and promoting the neuronal differentiation of RPCs. In conclusion, the meticulous modulation of RPC proliferation and differentiation mediated by ZS bioceramics held promise for novel therapeutic strategies of retinal degenerative diseases and neurodegenerative disorders.
研究领域:
生物医学工程
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眼科研究
·
再生医学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2022
·Vol. 10
·期 46
·9639-9653
·
IF 7.571
Xinyuan Yuan,Teliang Lu,Fupo He,Tingting Wu,Xiaolan Wang,Jiandong Ye
Biomaterials in combination with multiple bioactive ions could create a favorable microenvironment for bone remolding. Herein, zinc silicate/β-tricalcium phosphate (ZS/β-TCP) composite ceramic scaffolds with different amounts of ZS (5, 10, and 15 wt%) were constructed using a three-dimensional fiber deposition (3DF) technique. The physicochemical, osteogenic and angiogenic properties of these interconnected macroporous scaffolds were investigated systematically. Simultaneously, GeneChip, alkaline phosphatase (ALP), western blot (WB) and polymerase chain reaction (PCR) were utilized to elucidate the underlying mechanism of the enhancement in osteogenic differentiation. The results showed that the incorporation of ZS significantly improved the mechanical performance by more than 5 fold in comparison with the β-TCP ceramic scaffold (4.79 ± 0.99 MPa). The ZS modified β-TCP scaffolds greatly supported the cytoactivity, adhesion, proliferation of mouse bone marrow mesenchymal stem cells (mBMSCs) and human umbilical vein endothelial cells (HUVECs). The expression levels of osteogenic genes and proteins as well as angiogenic genes were markedly upregulated by the sustained release of bioactive ions (mainly Si and Zn) from the composite scaffolds. The 10ZS/β-TCP demonstrated the best overall performance in vitro. Moreover, the 10ZS/β-TCP displayed a high bone volume fraction, bone maturity and angiogenesis after implantation in the rat skull defects for 6 weeks. It was further verified that ZS/β-TCP scaffolds stimulated the osteogenic differentiation of mBMSCs by activating the p38 signaling pathway directly. The 10ZS/β-TCP ceramic scaffold holds great potential for the fast repair of bone defects, and deep understanding of the mechanism will facilitate the formulation of new strategies for bone repair.
研究领域:
生物材料
·
组织工程
·
骨再生
·
细胞生物学
·
分子生物学
✓ 已验证
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）