CHEMICAL ENGINEERING JOURNAL
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2018
·
IF 6.735
Kai Wang,Shien Pei,Zhishun He,Liang-ai Huang,Shasha Zhu,Jianfeng Guo,Haibo Shao,Jianming Wang
Nanostructured silicon/carbon composites with enhanced lithium storage are especially attractive for lithium-ion batteries (LIBs). The SiAl/Al-MOF core-shell precursor is prepared by the self-corrosion reaction of SiAl alloy with an organic acid in the hydrothermal condition, and the following rational annealing and etching treatments lead to the formation of the porous silicon microsphere@C (pSiMS@C) core-shell composite. The pSiMS@C composite is composed of an amorphous carbon shell and the porous silicon microsphere core consisting of interconnected nanowires, manifesting a novel core-shell structure. The as-prepared pSiMS@C electrode delivers a reversible capacity of 1027.8 mAh g −1 after 500 cycles at 1 A g −1 , with a good capacity retention of 79%. The carbon shell may markedly improve the electronic conductivity, and the porous silicon microsphere core may promote the kinetics for Faradic reaction and diffusion process and alleviate the huge volume change during the charge/discharge cycling, responsible for the excellent lithium storage performance of the pSiMS@C core-shell composite.
研究领域:
材料科学
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能源存储
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产品关联
DOI
高影响因子
CRYSTENGCOMM
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2018
·Vol. 20
·期 40
·6351-6357
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IF 3.304
Kui-Suo Yang,Yi-Lian Li,Yang-Yang Ma,Li-Na Feng,An-Ping Wu,Yan Qiao,Jin-Rong Bao,Wen-Xian Li,Xiao-Wei Zhu,Ran-Bo Yu
A novel core–shell–shell SiO2@CePO4:Tb@SiO2 submicro-sphere was controllably synthesized by a bridging ligand organosilane HOOCC6H4N(CONH(CH2)3Si(OCH2CH3)3)2 (MABA-Si) connecting the silica core and rare earth ions. The as-synthesized samples were investigated using scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and infrared spectroscopy (IR). It is found that SiO2@CePO4:Tb@SiO2 has a ∼25 nm outermost shell, a ∼4 nm intermediate shell, and a ∼200 nm core. SiO2@CePO4:Tb@SiO2 exhibits stable photoluminescence properties in aqueous solution: its photoluminescence intensity was unquenched even after 15 days. The core–shell–shell submicro-spheres were found to have better photoluminescence than the core–shell submicro-spheres because the SiO2 shell protected the phosphor materials and then improved its photoluminescence intensity and biocompatibility. A formation mechanism of the core–shell–shell SiO2@CePO4:Tb@SiO2 submicro-spheres was proposed. Thus, the low-cost preparation of the core–shell–shell SiO2@CePO4:Tb@SiO2 submicro-spheres could be rationally achieved using SiO2.
研究领域:
材料科学
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纳米技术
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光学
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化学
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DOI
高影响因子
MACROMOLECULAR RAPID COMMUNICATIONS
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2020
·Vol. 41
·期 17
·2000307
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IF 4.886
Kesong Tian,Junyan Wang,Wanchun Guo,Ruifei Li,Ling Cao,Zhaopeng Xu,Haiyan Wang
Yolk–shell magnetic nanoparticles@nitrogen-enriched Carbon nanostructures with a magnetic core and a hollow nitrogen-enriched carbon shell exhibit considerable promise in various applications, such as drug delivery, heterogenous catalysts, removal of metal ions and organic pollutants, and screening of biomolecules, due to their strong magnetic response, unique cavities, and the selective absorption ability of nitrogen-enriched groups. However, their complicated synthesis always involves possible surface modification, layer-by-layer deposition of a sacrificial middle layer and an outer nitrogen-enriched layer on magnetic nanoparticles, subsequent carbonization, and final removal of the sacrificial middle layer. Herein, yolk–shell Fe 3 O 4 @nitrogen-enriched carbon nanostructures are constructed based on NH 4 + ion-induced one-step deposition of SiO 2 and Resorcinol-3-aminophenol-formaldehyde cocondensed resin (R-APF) dual layers onto poly acrylic acid-modified Fe 3 O 4 nanoclusters without any extra surface modification. The N-Carbon shell thickness of the yolk–shell Fe 3 O 4 @Void@N-Carbon nanostructure can be finely tailored though tailoring the feeding amount of aminophenol and resorcinol to tune the thickness of the outer R-APF resin shell onto Fe 3 O 4 @SiO 2 intermediate particles. This NH 4 + ion-induced one-pot deposition of double layers can effectively promote synthesis efficiency of this kind of yolk–shell nanostructure.
研究领域:
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
PubMed
高影响因子
Journal of Materials Chemistry B
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2015
·Vol. 4
·期 5
·893-901
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IF 4.726
Fu-xing Lin,Jie-lin Rong,Mo-zhen Wang,Dan-dan Bao,Yun Wang,Zhen-xing Gong,Yu-fang Gu,Yu Zhao,Xue-wu Ge
A core–shell structured chitosan (CS)-based gene vector with a sustainable gene transfection effect was designed and successfully prepared in this study. The pEGFP was first combined with the thiolated and N-alkylated chitosan (TACS). Then, hydroxybutyl chitosan grafted with poly(ethylene glycol) (EG–HBC) was coated on the pEGFP-loaded TACS particles. The prepared pEGFP-loaded TACS@EG–HBC particles have a size of about 200 nm and little cytotoxicity. The in vitro and in vivo gene transfection experiments indicate that the pEGFP-loaded TACS@EG–HBC particles possess a better sustainable gene transfection capacity and a high transfection efficiency, which should be attributed to the biodegradation of the CS-based shell, the thiolation and N-alkylation modification on CS cores, and the grafted PEG chains with better biocompatibility. The in vivo gene expression of the loaded pEGFP can persist up to 60 days. This novel gene vector has a theoretical and practical significance for gene therapy with sustained transfection effect.
研究领域:
药学
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生物技术
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基因治疗
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产品关联
DOI
PubMed
高影响因子
POLYMER ENGINEERING AND SCIENCE
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2024
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IF 3.2
Yangbo Xu,Rulin Shen,Juntao Tang,Xiangfu Zou,Wenhu Wan,Haibo Guo
Shell materials play significant impact on corrosion resistance and mechanical properties on self-healing coating of composite with core-shell nanofiber. In this paper, three promising shell materials were investigated to optimize the performance of self-healing coating. Self-healing core-shell nanofibers with different shell materials were prepared with coaxial electrospinning. The resulting nanofibers were used to prepare self-healing corrosion resistance coating. The tensile test revealed a notable enhancement in the tensile strength of PA6 core-shell nanofiber epoxy composite coatings compared with the epoxy coating, demonstrating increase of 26.92%. Friction and wear test indicated reductions in the friction coefficients of PAN, PVDF, and PA6 core-shell nanofibers by 13.82%, 12.44%, and 26.27%, respectively. The self-healing and anti-corrosion abilities were evaluated through electrochemical impedance spectroscopy (EIS) test. All three coatings exhibited exceptional self-healing efficiencies exceeding 90%, highlighting the substantial potential of the chosen shell materials as nanocontainers for self-healing agent. Results indicate that the nanofibers with PA6 as shell material can achieve the best enhancement performance, which has a greater potential for the corrosion protection and long-lasting use of offshore wind turbine tower coatings. Highlights Optimizing coating performance by screening coaxial nanofibers for shell materials Shell material can improve the tensile strength of coating up to 26.92% Friction coefficient of PA6 nanofiber coating was about 15% lower than PAN and PVDF All three coatings exhibited exceptional self-healing efficiencies exceeding 90%
研究领域:
材料科学
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腐蚀与防护
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纳米技术
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产品关联
DOI
高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2025
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IF 4
Xingyun Zhao,Chengxiao Zhao,Rongfang Wu,Jiangyan Jin,Xiaojian Liu,Zhenwei Zhang,Siyu Yang,Ke Li,Zhenyu Li,Xuemei Qin
The development of core-shell materials for achieving more efficient and rapid chromatographic separations has remained a key objective in separation science. In this study, monodisperse SiO 2 particles (2–4 µm in diameter) were utilized to fabricate core-shell spheres through a combined approach involving a modified sol-gel process and a biphasic system. The synthesis employed 1,6-bis(triethoxysilyl) hexane (BTMSH), 1,2-bis(triethoxysilyl) ethane (BTEE) as a bridging agent with cetyltrimethylammonium bromide (CTAB) acting as a co-template. Notably, the shell thickness could be precisely tailored within the range of 70∼300 nm through systematic optimization of stirring rate, solvent selection, and silica precursor type. The separation of aromatics analytes was evaluated and that baseline separation was achieved for both molecules on all the columns packed n -octadecyltrichlorosilane modified core-shell silica particles with tunable shell thickness. Column efficiencies up to ∼168, 325 plates m -1 were achieved for pyrene on the CS X-E -C18 column ( n -octadecyltrichlorosilane modified core-shell silica). In addition, a hydrophilic interaction liquid chromatography (HILIC) core-shell stationary phase that amide modified core shell silica was prepared (named as CS X-E -AM) via an improved polymerization coating approach and applied for oligosaccharides separation. The results demonstrated that the core-shell spheres were prepared with tailored shell structure and exhibited that the column was stable and could meet the requirement for HPLC separation.
研究领域:
分析化学
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材料科学
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色谱技术
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产品关联
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Ziteng Wang,Yijin Cai,Mingxuan Li,Xiaoru Wan,Li Mi,Wenge Yang,Yonghong Hu
Chitin oligosaccharides (CTOS) possess potential applications in food, medicine, and agriculture. However, lower mass transfer and catalytic efficiency are the main kinetic limitations for the production of CTOS from shrimp shell waste (SSW) and crystalline chitin. Chemical or physical methods are usually used for pretreatment to improve chitinase hydrolysis efficiency, but this is not eco-friendly and cost-effective. To address this challenge, a chitinase nanoreactor with the liquid-solid system ( Bc ChiA1@ZIF-8) was manufactured to boost the one-step degradation of SSW and crystalline chitin. Compared with free enzyme, the catalytic efficiency of Bc ChiA1@ZIF-8 on colloidal chitin was significantly improved to 142 %. SSW and crystalline chitin can be directly degraded by Bc ChiA1@ZIF-8 without any pretreatments. The yield of N , N′ -diacetylchitobiose [(GlcNAc) 2 ] from SSW and N -acetyl- D -glucosamine (GlcNAc) from crystalline chitin was 2 times and 3.1 times than that of free enzyme, respectively. The reason was that Bc ChiA1@ZIF-8 with a liquid-solid system enlarged the interface area, increased the collision frequency between enzyme and substrate, and improved the large-substrates binding activity of chitinase. Moreover, the biphasic system exhibited excellent stability, and the design showed universal applicability. This strategy provided novel guidance for other polysaccharide biosynthesis and the conversion of environmental waste into carbohydrates.
研究领域:
生物化学
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环境科学
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食品科学
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DOI
PubMed
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2022
·Vol. 29
·期 51
·77851-77863
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IF 5.19
Jiang Changjin,Zhang Ting,Li Shuhui,Yang Zhaoguang
Fe(III)-chitosan and Fe(III)-chitosan-CTAB composites were prepared using an ionotropic gelation method. Various techniques were used to analyze the morphology, structure, and property of the adsorbents, including SEM, EDS, FT-IR, XPS, and zeta potential. Compared with Fe(III)-chitosan, Fe(III)-chitosan-CTAB was more effective for As(V) adsorption at a wide range of pH (3.0–8.0). The adsorption of As(V) onto Fe(III)-chitosan and Fe(III)-chitosan-CTAB could reach equilibrium in 20 min, and their maximum adsorption capacities were 33.85 and 31.69 mg g ‒1 , respectively. The adsorption kinetics was best described by the pseudo-second-order model ( R 2 = 0.998 and 0.992), whereas the adsorption isotherm was fitted well by the Freundlich model ( R 2 = 0.963 and 0.987). The presence of H 2 PO 4 – significantly inhibited the adsorption of As(V) onto Fe(III)-chitosan and Fe(III)-chitosan-CTAB, and humic acid also led to a slight decrease in As(V) adsorption by Fe(III)-chitosan-CTAB. Over 94% of As(V) at the initial concentration of no more than 5 mg L –1 was removed from real water by the two adsorbents. 1% (w/v) NaOH solution was determined to be the most suitable desorption agent. Fe(III)-chitosan and Fe(III)-chitosan-CTAB still maintained their initial adsorption capacities after five adsorption–desorption cycles. Based on different characterization results, both electrostatic attraction and surface complexation mechanisms played important roles in As(V) adsorption on Fe(III)-chitosan and Fe(III)-chitosan-CTAB.
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
PubMed
高影响因子
FUEL
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2023
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IF 7.4
Shanshan Shao,Yifan Wang,Laixin Ma,Ziheng Huang,Xiaohua Li
The improved CO 2 adsorption capacity and selectivity is the focus of research on the carbon-based CO 2 adsorbent, while nitrogen-containing groups on the surface of adsorbent have an important effect on the CO 2 adsorption. In this study, nitrogen self-doped hierarchical porous carbon was prepared from three kinds of crustacean shells, namely, hairy crab shell, crayfish shell and greasyback shrimp shell. It revealed that the pore structure of porous carbon can be regulated well with the varied activation temperature and the amount of KOH. With the favorable activation temperature of 800℃ and the mass ratio of activator to carbon (A/C) of 1:1, the obtained porous carbon with different carbon precursors exhibited relatively high specific surface area (1430.63–1734.64 m 2 /g), large pore volume (0.70–1.48 cm 3 /g) and developed pore-size distribution. Consequently, among the three kinds of hierarchical porous carbon tested, that prepared form greasyback shrimp displayed the excellent CO 2 adsorption of 5.144 and 4.325 mmol/g at 1 bar, 273 K and 298 K and the highest CO 2 /N 2 selectivity was observed of 32.32, attributed to the volume of mesopore and micropore and the type of nitrogen-containing groups. The effects of nitrogen-containing groups in porous carbon on the CO 2 adsorption and CO 2 /N 2 selectivity were analyzed, and it revealed that the CO 2 /N 2 selectivity of porous carbon was positively correlated with pyrrolic N. In conclusion, the porous structures and nitrogen-containing groups of porous carbons both contribute to the CO 2 adsorption and selectivity. The porous carbon with well recycling performance in this study presented a practical application prospect.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
·
IF 7.7
Jinming Ye,Yi Ru,Huifen Weng,Liling Fu,Jun Chen,Fuquan Chen,Qiong Xiao,Anfeng Xiao
A new type of core-shell microsphere was prepared by a pre-crosslinking method, consisting of cross-linked agarose microspheres as the core and agarose-dextran as the shell. After optimizing the preparation process, the microspheres with a uniform particle size were obtained and characterized using cryo-scanning electron microscopy to determine their surface and cross-sectional morphology. Results from flow rate-pressure and chromatographic performance tests showed that the core-shell agarose microspheres were supported by the core microspheres and composed of composite polysaccharides, forming an interpenetrating polymer network structure as a hard shell. The core-shell agarose microspheres showed a 300.5 % increase in linear flow rate compared to composite polysaccharide microspheres prepared from shell materials and a 141.5 % increase compared to 6 % agarose microspheres. Additionally, the large pore structure of the shell combined with the fine pore structure of the core improved the material separation efficiency in the range of 0.1–2000 kDa. These findings suggest that core-shell natural polysaccharide microspheres have great potential as a separation chromatographic medium.
研究领域:
生物材料
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分析化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Shuibo Wang,Biao Wu,Qiuju Zhang,Yiming Li,Lin Zhu,Hongbo Yu,Hongfeng Yin
The selective hydrogenation of cinnamaldehyde (CAL) to prepare cinnamyl alcohol (COL) is challenging as the unwanted hydrogenation of C C bond in CAL is thermodynamically more favorable than the hydrogenation of C O bond. We herein designed core–shell structured nanoparticles (NPs) that consisted of Pt cores and Sn shells to catalyze the CAL to COL conversion. By simply changing the amount of Sn precursor, we generated Pt@Sn NPs with different Sn shell thickness and catalytic performance. Among the samples, Pt@Sn/SiO 2 with Pt/Sn of 1/1 achieved the highest CAL conversion (87.2 %) as well as the COL selectivity (95.4 %), which were 5-fold and 6-fold, respectively, higher than those of Pt/SiO 2 . This catalyst was also applicable to the hydrogenation of other α, β-unsaturated aldehyde and unsaturated carbonyl compounds. Both experiments and theoretical calculations indicated that the strong Pt-Sn interaction and the partial coverage of Pt by Sn facilitated their adsorption of C O bonds, thus enhancing the conversion of CAL and the selectivity towards COL.
研究领域:
催化化学
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材料科学
·
理论计算
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产品关联
DOI
高影响因子
Cell Reports Physical Science
·
2022
·
IF 7.832
Qing Zeng,Danye Liu,Hui Liu,Lin Xu,Penglei Cui,Dong Chen,Jing Wang,Jun Yang
Construction of core-shell nanostructures with ultrathin shells is a powerful way to leverage the lattice strain effect to enhance surface activity for a given catalytic reaction. Herein, we report a gold-catalyzed approach for growing a large variety of subnanometer-thick metal shells of up to several atomic layers on the gold cores. This strategy relies on a gold-catalyzed reduction of various metal precursors, in both aqueous and organic solvents, in which the metal atoms nucleate on the gold seed surfaces instead of self-nucleating in the solution. In addition, by coupling this gold catalysis with the galvanic replacement reaction, the ultrathin shell composition could be tuned to further optimize the lattice strain effect in the shell layer. This provides an effective way to equip the core-shell nanostructures with the desired catalytic performance in some key electrochemical reactions, for example, the ethanol oxidation reaction and oxygen reduction reaction.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）