DALTON TRANSACTIONS
·
2021
·Vol. 51
·期 4
·1481-1488
·
IF 4.39
Maierhaba Abudoureheman,Juanjuan Zheng,Peng Wang,Bo Wei,Zhiyong Guo,Zhaohui Chen,Yanna Chen
The exploration of A–Mo–P–O (A = Rb, Cs) systems has allowed several new Mo(V) phosphates, Rb2MoP2O9, Rb6Mo2P4O19 and Cs6Mo2P4O19, to be synthesized through the spontaneous nucleation method. Single-crystal X-ray diffraction analysis reveals that the identical stoichiometry compounds Rb2MoP2O9 and Cs2MoP2O9 belong to different space groups C2/c and Pbca, respectively. Both compounds consist of dissimilar 1D [Mo–O–P]∞ chains with different repeated building units, while monovalent cations fill in spaces to form 3D structures. However, Rb6Mo2P4O19 and Cs6Mo2P4O19 are isostructural and crystallize in the same space group of P21/c. They exhibit a 3D framework structure with 0D Mo2O5O6P4O8 groups, which are separated by Rb/Cs atoms. Interestingly, structural relationships between the different monophosphates of the A–Mo–P–O (A = Rb, Cs) systems are presented in which distinct polyanionic configurations appear owing to the A/P ratios, as well as the size of the univalent cations. Further, detailed structural comparisons, optical properties and theoretical calculations are also discussed.
研究领域:
材料科学
·
化学
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DOI
PubMed
高影响因子
NUCLEAR TECHNOLOGY
·
2022
·
IF 1.667
Yanhui Wang,Qiao Jiang,Yexin Yang,Jianfeng Cheng,Chenyang Bao,Yuelong Pan,Yu Liu,Gang Yang,Yangchun Leng,Xianguo Tuo
The alteration of the morphology of bentonite, a key barrier to isolating high-level radioactive waste in deep geological repositories under long-term interaction with groundwater, was studied. Bentonite colloids were prepared from Gaomiaozi bentonite, and its various properties were analyzed by various characterization methods. The effects of various factors on the adsorption of Cs(I) and Co(II) on bentonite colloids were investigated by batch static adsorption experiments. The results showed that the colloids were mainly composed of montmorillonite and were lamellar in shape, with a zeta potential of −enton mV and an average size of approximately 209.10 nm. The adsorption of Cs(I) and Co(II) by the colloids was a rapid process, and 31.78 and 88.24 mg/g, respectively, were adsorbed at equilibrium. Pseudo-second-order kinetic fitting showed that chemisorption plays a dominant role and acid-base interactions affect adsorption by influencing the stability of colloids and the chemical form of simulated nuclides. This work can be helpful for evaluating the safety of waste repositories.
研究领域:
环境科学
·
放射性废物管理
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DOI
高影响因子
International Journal of Nanomedicine
·
2016
·
IF 4.32
Ping Sun,Wei Huang,Mingji Jin,Qiming Wang,Bo Fan,Lin Kang,Zhonggao Gao
Nanoparticle-mediated small interfering RNA (siRNA) delivery is a promising therapeutic strategy in various cancers. However, it is difficult to deliver degradative siRNA to tumor tissue, and thus a safe and efficient vector for siRNA delivery is essential for cancer therapy. In this study, poly(ethylene glycol)-modified chitosan (PEG-CS) was synthesized successfully for delivering nucleic acid drug. We deemed that PEGylated CS could improve its solubility by forming a stable siRNA loaded in nanoparticles, and enhancing transfection efficiency of siRNA-loaded CS nanoparticles in cancer cell line. The research results showed that siRNA loaded in PEGylated CS (PEG-CS/siRNA) nanoparticles with smaller particle size had superior structural stability in the physical environment compared to CS nanoparticles. The data of in vitro antitumor activity revealed that 4T1 tumor cell growth was significantly inhibited and cellular uptake of PEG-CS/siRNA nanoparticles in 4T1 cells was dramatically enhanced compared to naked siRNA groups. The results from flow cytometry and confocal laser scanning microscopy showed that PEG-CS/siRNA nanoparticles were more easily taken up than naked siRNA. Importantly, PEG-CS/siRNA nanoparticles significantly reduced the growth of xenograft tumors of 4T1 cells in vivo. It has been demonstrated that the PEG-CS is a safe and efficient vector for siRNA delivery, and it can effectively reduce tumor growth and prevent metastasis.
研究领域:
癌症治疗
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药学
·
纳米技术
·
分子生物学
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DOI
PubMed
高影响因子
JOURNAL OF RARE EARTHS
·
2022
·
IF 4.632
Lingyun Li,Ziwei Zhou,Fazheng Huang,Senlin Peng,Yantang Huang,Guoqiang Wang,Xinxu Li,Fei-Fei Chen,Chengkai Yang,Xin-Xiong Li,Yan Yu
The Er 3+ doped double perovskite Ba 2 CaWO 6 crystal is a promising ratiometric thermometer based on the fluorescence intensity ratio (FIR) of transitions from 2 H 11/2 and 4 S 3/2 to the lowered 4 I 15/2 level. However, the Ca 2+ vacancy defect caused by the charge difference between rare-earth ions and the substituted alkaline-earth ions gives rise to the non-radiative probability and limits the thermal sensitivity. Here, the up-conversion luminescence and thermometric performance of Er 3+ , Yb 3+ doped Ba 2 CaWO 6 are tuned by tri-doping with alkaline ions. The Ca 2+ vacancy defect can be eliminated by the introduction of Na + , which occupies the Ca 2+ site when it is doped into Ba 2 CaWO 6 with Er 3+ and Yb 3+ . On the contrary, the doping of Cs + into Ba 2 CaWO 6 with Er 3+ and Yb 3+ enhances the defect concentration because it occupies the site of Ba 2+ . Thus, the tri-doping of Na + reduces the non-radiative probability and enhances the quantum efficiency of Er 3+ , leading to the improvement of the thermometric sensitivity of Ba 2 CaWO 6 . As a result, we get an excellent thermometric Ba 2 CaWO 6 :8%Yb 3+ ,3.5%Er 3+ ,6%Na + powder with a luminescence lifetime of 515 μs and maximum thermal sensitivity ( S r ) of 1.45%/K, which is more than three times higher than that of the BCWO:Er 3+ powder.
研究领域:
材料科学
·
光学
·
温度测量
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Sibo Zhao,Hengbin Mao,Weishan Ma,Mingliang Li,Shao Gang,Bingbing Fan,Hailong Wang,Hongliang Xu,Hongxia Lu
All-inorganic halide perovskite nanocrystals (NCs) have attracted much attention in many fields. However, the poor stability of NCs and the toxicity of Pb have greatly hindered their practical applications. Reducing the proportion of Pb with the concept of high-entropy and coating NCs with an outer layer have been regarded as effective strategies to solve the problems. Herein, We have successfully synthesized the all-inorganic high-entropy dual-phase Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Cd 1/5 )Br 3 /Cs(Pb 1/5 Mn 1/5 Ni 1/5 Zn 1/5 Cd 1/5 ) 2 Br 5 (Cs‘B’Br 3 /Cs‘B’ 2 Br 5 ) perovskite NCs with good luminescence properties by a high-energy ball milling method; On the basis of which, Cs‘B’Br 3 /Cs‘B 2 ’Br 5 NCs are coated with SiO 2 and EVA resin. Due to the amorphous SiO 2 protection, the Cs‘B’Br 3 /Cs‘B 2 ’Br 5 @SiO 2 NCs maintained 93% of their emission intensity after 90 days compared to their uncoated counterparts. The PL intensity of Cs‘B’Br 3 /Cs‘B 2 ’Br 5 NCs /EVA was significantly enhanced by a factor of 4.7 for compared to the uncoated NCs. In addition, the PL emission intensity of the Cs‘B’Br 3 /Cs‘B 2 ’Br 5 NCs /EVA remained 93.7% after 90 days, and the emission peak intensity remained approximately 63% after 8 h of placement in an enclosed environment at 80% humidity through the dense polymer chains and the hydrophobic nature of the film. Finally, the film could expand its application prospects in the field of flexible device.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yuxi Wang,Pan Cheng,Tiange Chen,Mingyue Li,Qihao Guo,Qin Cheng,Dong Wang,Ke Liu
Developing monolithic materials for chromatography columns with a novel interconnected porous structure is vital for the enhancement of the separation efficiency of RNA purification processes. Herein, a porous nanofibrous sponge (PNFS) is constructed by freeze molding and freeze-drying a nanofiber dispersion with ethylene vinyl alcohol copolymer nanofibers as the skeleton, chitosan (CS) and polyethylenimine (PEI) as the binders, and glutaraldehyde (GA) as the crosslinking agent. The results show that when the CS content of the dispersion is 1.5 wt %, PNFS demonstrates a high static adsorption capacity of 406.5 mg/g (30.7 mg/m2) and a dynamic adsorption capacity of 382.6 mg/g (28.9 mg/m2) at a flow rate of 1 mm/min. Moreover, PNFS shows a high specific adsorption performance toward RNA in the presence of bovine serum albumin, lecithin, or DNA by adjusting the solution pH value and the method of gradient elution. Besides, PNFS presents exceptional performance in the rapid separation of RNA from HT22 cells without degradation. This result can be attributed to optimized morphology, pore structure, and comprehensive performance of PNFS, benefiting from the synergistic effect of the highly oriented porous structure and CS–PEI interaction derived from the high-density adsorption ligands on the channel walls of PNFS. This work provided an efficient strategy to handle the permeability/adsorptivity trade-off for ion-exchange chromatographic materials.
研究领域:
生物工程
·
材料科学
·
分子生物学
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产品关联
DOI
PubMed
高影响因子
Journal of Environmental Chemical Engineering
·
2024
·
IF 7.4
Kang Li,Chenxi Li,Yisa Liu,Jiong Dong,Lili Xu,Yanran Li,Ruixin Ma,Shina Li
The widespread application of nuclear energy has increased the risk of contamination by radionuclide 137 Cs. Prussian blue analogues are considered to be excellent materials for the removal of 137 Cs from wastewater due to their unique structure. In this work, Cs + adsorbent for PBAs with Fe-Co framework, potassium iron hexacyanocobaltate (PBA Fe ), was synthesized by room temperature precipitation method. Systematic structural characterization and performance results of PBA Fe showed that it has a specific surface area of 452.8 m 2 /g and an average pore size of 8.6 nm, providing more active sites for Cs + . The adsorption of Cs + on PBA Fe exhibited fast reaction kinetics (within 10 min) and high adsorption capacity (82.90 mg/g), and the removal rate of Cs + reached 98.57 %. The efficient removal of Cs + by PBA Fe in various real water environments showed its excellent selectivity and potential for practical application. In addition, adsorption mechanism studies showed that the adsorption of Cs + was achieved by ion exchange with K + in the PBA Fe lattice. PBA Fe has the advantages of simple synthesis and good selectivity, and has potential application in the harmless treatment of Cs + in radioactive wastewater.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS SCIENCE FORUM
·
2020
·
IF 0
Gui Juan Li,Hai Xi Luo,Wei Xia,Xue Feng Xu,Yu Zhang
Nano coir cellulose whiskersare materials abstracted from mesocarp of coconut shell which was modified by using KH570 as a coupling agent and modified nano coir cellulose whiskers need to be dispersed in chitosan/polyvinyl alcohol (CS/PVA) mixture solution. Because of regular structure and high crystallinity, nano coir cellulose whiskers could be applied in medical materials.In this paper, the results obtained with solution casting method by characterizing and analyzing structure, thermal properties, crystallization behavior and morphology of nano coir cellulose whiskers enhanced CS/PVA composite filmby FTIR, DSC, TG, XRD and SEM test. Different content of modified nano coir whiskers and CS/PVA composite film were preparedand themechanical properties of the composite film were also conducted. The results show that the tensile strength and Young's modulus of the CS/PVA composite film with modified nano coir whiskers are significantly improved, and Elongation break increases at first and then decreases, which indicates nano coir cellulose whiskers are good materials for medical purpose.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
Journal of Environmental Sciences
·
2023
·
IF 6.9
Shanshan Feng,Jingshuai Gao,Shouzhu Li,Xun Cao,Jie Ni,Xiuli Yue,Wei Zheng,Yuyao Li,Xueqi Hu,Yao Zhang,Sheng Feng
To improve the selective separation performance of silica nanofibers (SiO 2 NFs) for cesium ions (Cs + ) and overcome the defects of Prussian blue nanoparticles (PB NPs), PB/SiO 2 -NH 2 NFs were prepared to remove Cs + from water. Among them, 3-aminopropyltriethoxysilane (APTES) underwent an alkylation reaction with SiO 2 , resulting in the formation of a dense Si-O-Si network structure that decorated the surface of SiO 2 NFs. Meanwhile, the amino functional groups in APTES combined with Fe 3+ and then reacted with Fe 2+ to form PB NPs, which anchored firmly on the aminoated SiO 2 NFs surface. In our experiment, the maximum adsorption capacity of PB/SiO 2 -NH 2 NFs was 111.38 mg/g, which was 31.5 mg/g higher than that of SiO 2 NFs. At the same time, after the fifth cycle, the removal rate of Cs + by PB/SiO 2 -NH 2 NFs adsorbent was 75.36% ± 3.69%. In addition, the adsorption isotherms and adsorption kinetics of PB/SiO 2 -NH 2 NFs were combined with the Freundlich model and the quasi-two-stage fitting model, respectively. Further mechanism analysis showed that the bond between PB/SiO 2 -NH 2 NFs and Cs + was mainly a synergistic action of ion exchange, electrostatic adsorption and membrane separation.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2025
·Vol. 334
·期 2
·1287-1297
·
IF 1.6
Li Yifan,Cao Shuang,Yang Qingming,Wang Yuannuo,Wang Jingyang,Jiao Caishan,Zhang Meng,Zhang Lei
The removal of Cs and Sr from high level radioactive waste is very important for ecological protection. However, simultaneous immobilization of Cs and Sr is rarely reported. In this work, a perovskite structure CsSr 2 Ta 3 O 10 was synthesized by molten salt method. CsSr 2 Ta 3 O 10 has good thermal stability up to 900 °C at least. Under the γ irradiation of Co-60, most of the material maintained its structural integrity. CsSr 2 Ta 3 O 10 demonstrates a wide range of pH durability, where Cs is stable in the pH range from 4 to 12 and Sr from 2 to 12. Its frame structure remains stable in the pH range from 2 to 12 and will not be decomposed. Further sintering of CsSr 2 Ta 3 O 10 ceramic waste forms results in a high density of 93% − 95%. Moreover, leaching experiments conclude that the long-term leaching rates of Cs and Sr begin to stabilize after 14 days, reaching the order of 10 0 and 10 −3 g·m −2 ·d −1 . These results provide a possibility for the simultaneous immobilization of Cs and Sr.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 2
·382-388
·
IF 1.1
Cao Tian,Li Wei,Ren Lin,Song Tao,Song Jie,Lin Jiacheng,Yang Li,Liu Wenxiu,Wang Ping,Feng Shaojie
The adsorption of phosphate was conducted by the complex of chitosan/polyacrylamide/ferric(CS/PAM/Fe(III)) prepared. The SEM images and XPS spectra confirmed the successful adsorption of phosphate. The adsorption process was studied by varying the influencing aspects like pH, co-existing ions, contact time, and initial phosphate concentration. The experimental results indicate that the adsorptive capacity decreases with the increase of pH. However, it is commendable that there is still a adsorption capacity of more than 5 mg/g when the pH is 8–11. The adsorption kinetics can be accurately described by the pseudo-second-order model and is controlled by both chemisorption and surface diffusion. The adsorption process is a single layer adsorption. This paper proposed that the adsorption mechanism of CS/PAM/Fe(III) complex is the joint action of electrostatic attraction and ligand exchange.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Materials Today Bio
·
2025
·
IF 10.2
Qiumei Lan,Mengtian Fan,Fengmei Zhang,Qian Gong,Jiayan Zhong,Miao Yi,Qiqi Zeng,Jianqiang Chen,Yiming Pan,Nana Geng,Biao Kuang,Yu Du,Chuanrong Zhao,Deping Zeng,Chunliang Zhao,Zhen Li,Guixue Wang,Fengjin Guo
Bone regeneration remains a formidable challenging due to impaired energy metabolism and the limited osteogenic potential of transplanted stem cells. Mitochondrial homeostasis orchestrates osteogenesis, with mitophagy maintaining the metabolic rhythm essential for bone formation. However, the role of autophagy related gene 7(ATG7), a pivotal regulator of mitochondrial function, in bone regeneration remains elusive. In this study, we developed a ATG7-overexpressing bone marrow mesenchymal stem cells (ATG7-BMSCs) encapsulated within a thermoresponsive chitosan (CS) hydrogel, creating a biocompatible, living platform capable of adapting to physiological conditions. The hydrogel exhibited excellent injectability, physiological gelation at 37 °C, and prolonged biocompatibility, providing a favorable microenvironment for stem cell survival and proliferation. The system was evaluated through in vitro assays for mitochondrial function and osteogenic differentiation, as well as in vivo using rat cranial and femoral defect models. Mechanistically, ATG7 activation enhanced mitophagy, preserved mitochondrial integrity, reduced reactive oxygen species (ROS) accumulation, and reactivated oxidative phosphorylation via the PI3K-AKT signaling pathway, thereby reprogramming osteogenic metabolism and promoting differentiation. Conversely, ATG7 deficiency led to mitochondrial dysfunction, glycolytic dependence, and impaired bone formation. In vivo, the ATG7-BMSC@CS hydrogel markedly accelerated new bone formation and mineral density recovery while maintaining excellent injectability, biocompatibility, and systemic safety. Collectively, this study identifies ATG7-driven mitophagy as a critical regulator of osteogenic metabolism and bone formation, and establishes a smart, living hydrogel platform that seamlessly integrates metabolic reprogramming with stem cell delivery. This strategy provides a conceptual blueprint for next-generation, metabolism-oriented bone repair at the intersection of cell biology, biomaterials, and precision medicine.
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DOI
PubMed
高影响因子
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