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Luminescence of samarium doped hydroxyapatite containing strontium:Effects of doping concentration

Journal of Rare Earths 2022年第3期40卷 398-405,I0002页

作者： Pu Chen Fen Wang Yinpo Qiao Zhen Zhang shaanxi key laboratory of green preparation and functionalization for inorganic materials School of Materials Science and EngineeringShaanxi University of Science and TechnologyXi'an 710021China

A series of samarium(Sm)doped hydroxyapatites containing strontium(Sr)with controllable and adjustable luminescence were designed and prepared via chemical hydrolysis co-precipitation *** effects of doping concentration of Sm on the structure,composition,photoluminescence(PL),energy transfer,substitute site,fluoresce lifetime and luminescence color of samples were *** is shown that the introduction of Sr ions induces the structure and composition change for Sm doped *** typical transitions of Sm^(3+) at 564,601,648 and 707 nm due to^(4)G_(5/2)→^(6)H_(J/2)(J=5,7,9 and 11)transition under the excitation of 404 nm were *** PL intensity is affected by the Sr/Ca ratio and Sm concentration,and the optimal concentration of Sm is 0.8 mol%when Sr/Ca ratio equals 7/*** non-radiative transitions and energy transfer of Sm ions are the main reason for the quenching,and the interactions among ions are ascribed to dipole-dipole type by theoretical ***,the ratio of PL intensity between 601 and 648 nm(r_(O/R)=I_(601nm)/I_(648nm))indicates the symmetry and substitution process of Sm ions to Ca/Sr *** fluorescence lifetime(τ)decreases with the concentration of Sm increasing,which is the result of the decrease of distance and the enhanced interaction between Sm *** CIE chromaticity coordinates and luminescence color of samples are in the orange-red region and have close relation with the concentration of ***,the cytotoxicity evaluation and confocal laser scanning microscopy(CLSM)observation of samples via cells indicate the good biocompatibility and safe use of this kind of bio-based luminescent materials for their potential efficient fluorescence labeling and detection.

关键词： Samarium Strontium Hydroxyapatite Photo-luminescence Energy transfer Cytotoxicity evaluation

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Ultralight pyrolytic carbon foam reinforced with amorphous carbon nanotubes for broadband electromagnetic absorption

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International Journal of Minerals,Metallurgy and materials 2023年第3期30卷 570-580页

作者： Luo Kong Sihan Luo Shuyu Zhang Guiqin Zhang Yi Liang School of materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021China

For electromagnetic wave-absorbing materials,maximizing absorption at a specific frequency has been constantly achieved,but enhancing the absorption properties in the entire band remains a *** this work,a 3D porous pyrolytic carbon(PyC)foam matrix was synthesized by a template *** carbon nanotubes(CNTs)were then in-situ grown on the matrix surface to obtain ultralight CNTs/Py C *** in-situ grown amorphous CNTs were distributed uniformly and controlled by the catalytic growth time and can enhance the interface polarization and conduction loss of *** the electromagnetic wave enters the internal holes,the electromagnetic energy can be completely attenuated under the combined action of polarization,conductivity loss,and multiple *** ultralight CNTs/Py C foam had a density of 22.0 mg·cm^(-3)and a reflection coefficient lower than-13.3 d B in the whole X-band(8.2-12.4 GHz),which is better than the conventional standard of effective absorption bandwidth(≤-10 dB).The results provide ideas for researching ultralight and strong electromagnetic wave absorbing materials in the X-band.

关键词： ultralight carbon foam amorphous carbon nanotubes broadband electromagnetic absorption

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Defective TiO_(2)-graphene heterostructures enabling in-situ electrocatalyst evolution for lithium-sulfur batteries

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Journal of Energy Chemistry 2021年第11期30卷 508-515,I0011页

作者： Yanqi Feng Hui Liu Yi Liu Fuwei Zhao Junqi Li Xuanmeng He School of materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021ShaanxiPR China

Lithium-sulfur (Li-S) batteries are considered as one of the promising next-generation energy storage systems because of their high energy density. While the low utilization of sulfur and sluggish reaction kinetics would lead to degradation of electrochemical performance and thus hinder the practical application of Li-S batteries. Herein, a double-shelled TiO_(2)-graphene heterostructure (H-TiO_(2)/rGO) with abundant oxygen vacancies (OVs) and highly exposed active plane as advanced host material in Li-S batteries is designed. This rational structure not only provides sufficient active sites and lower bandgap for lithium polysulfides (LiPSs), but also builds smooth adsorption-diffusion-conversion of LiPSs on catalyst, which greatly reduces interfacial energy barrier and promotes the utilization of sulfur through suppressing the devastating shuttling effect. Combining the synergetic merits of strong anchoring ability and catalyzing the of LiPSs, the electrode (S-TiO_(2)/rGO-1) exhibits superior rate performance and long lifespan (1000 cycles at 1C, 0.023% capacity loss per cycle) with high columbic efficiency. This work paves an alternative way to establish smooth adsorption-diffusion-conversion of polysulfides on catalyst in Li-S batteries and provides a new sight to understand catalyst design in energy storage devices.

关键词： Oxygen vacancy TiO_(2) Heterostructure Li-S batteries

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Microstructure and mechanical properties of Ti_(3)(Al,Ga)C_(2)/Al_(2)O_(3) composites prepared by in situ reactive hot pressing

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Journal of Advanced Ceramics 2020年第6期9卷 782-790页

作者： Yuan FANG Xiaohua LIU Yuxia FENG Jianfeng ZHU Wei JIANG School of Material Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi’an 710021China

In this study,Ti_(3)(Al,Ga)C_(2)/Al_(2)O_(3) composites were successfully synthesized by in situ hot pressing at 1350℃ for 2 h using Ti,Al,TiC,and Ga_(2)O_(3) as raw materials.X-ray diffraction and scanning electron microscopy were used for characterizing the phase identities and microstructures of the sintered *** dependence of the Vickers hardness and flexural strength on the Al_(2)O_(3) content was found to be in single-peak ***_(3)(Al_(0.6),Ga_(0.4))C_(2)/10.3vol% Al_(2)O_(3) composite exhibited significantly improved mechanical *** hardness and flexural strength of the composite reached 6.58 GPa and 527.11 MPa,which were 40% and 74% higher than those of Ti_(3)AlC_(2),*** of solid solution and incorporation of second phase of Al_(2)O_(3) resulted in the opposite influence on the fracture ***,the hardening and strengthening mechanisms were discussed in detail.

关键词： Ti_(3)AlC_(2) solid solution ceramic composites microstructure mechanical properties

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Improved thermal conductivity and breakdown strength of PVDF-based composites by improving the dispersion of BN

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High Voltage 2022年第3期7卷 595-605页

作者： Yanxin Li Zhuo Wang Menglei Kong Zhihui Yi School of materials Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi'anChina

In order to adapt to the development of electronic devices,it is necessary to improve the thermal conductivity and breakdown strength of *** nitride(BN)is an ideal candidate material with high breakdown strength and thermal ***-fore,the introduction of BN nanosheets into the polyvinylidene fluoride(PVDF)matrix can improve the thermal conductivity and breakdown strength of the composites at the same ***,BN nanosheets can easily agglomerate in the matrix,which limits the improvement of the properties of the *** overcome this difficulty,appropriate water-bath heating was used to improve the fluidity of ***,the dispersion of the filler is *** the volume fraction of BN nanosheets is 3%and the preparation temperature is 45℃,the energy storage density of the compos-ites reached 18.5 J/cm^(3) at 540 kV/*** this point,the thermal conductivity was 0.49 W/(m⋅K),3.5 times that of the pure PVDF film.

关键词： composites conductivity strength

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Growth of ultra-dense MoS_(2) nanosheets on carbon fibers to improve the mechanical and tribological properties of polyimide composites

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Friction 2021年第5期9卷 1150-1162页

作者： Jin YANG Qingfeng XIAO Zhe LIN Yong LI Xiaohua JIA Haojie SONG School of materials Science&Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science&TechnologyXi’an 710021China

To enhance the interface bonding of polyimide(PI)/carbon fiber(CF)composites,CFs were functionalized by introducing a polydopamine(PDA)transition layer,whose active groups provide absorption sites for the growth of molybdenum disulfide(MoS_(2))nanosheets and improve the bonding strength with *** and dense MoS_(2) nanosheets with thicknesses of 30–40 nm on the surface of the PDA@CF were obtained via a subsequent hydrothermal *** a result,the interface between the CF and the PI matrix becomes more compact with the help of the PDA transition layer and MoS_(2) *** is beneficial in forming PI/CF–MoS_(2) composites with better thermal stability,higher tensile strength,and enhanced tribological *** lubricating and reinforcing effects of the hybrid CF–MoS_(2) in the PI composite are discussed in *** tensile strength of the PI/CF–MoS_(2) composite increases by 43%,and the friction coefficient and the wear rate reduce by 57%and 77%,respectively,compared to those of the pure *** values are higher than those of the PI/CF composites without MoS_(2) *** results indicate that the CF–MoS_(2) hybrid material can be used as an additive to improve the mechanical and tribological properties of polymers.

关键词： carbon fibers(CFs) polydopamine MoS_(2)nanosheets interface tribology

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Enhanced adsorptive removal of Cr(VI)in aqueous solution by polyethyleneimine modified palygorskite

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Chinese Journal of Chemical Engineering 2020年第10期28卷 2650-2657页

作者： Jiahong Wang Tongtong Sun Atif Saleem Yao Chen School of Environmental Science and Engineering Shaanxi University of Science and TechnologyXi'an 710021China shaanxi key laboratory of green preparation and functionalization of inorganic materials Xi'an 710021China

Polyethyleneimine(PEI)modified palygorskite(Pal)was used for the adsorption of Cr(VI)in aqueous *** absorbent was characterized by Fourier transform infrared spectroscopy(FT-IR)and thermogravimetric analysis(TGA).Characterized results confirmed that the Pal has been successfully modified by *** modification of PEI increased the Cr(VI)adsorption performance of the Pal by the adsorption combined reduction mechanism,and amino groups of the adsorbent play the main role in the enhanced Cr(VI)*** maximum adsorption capacity was 51.10 mg·g^-1 at pH4.0 and 25°*** adsorption kinetics of Cr(VI)on the adsorbent conforms to the Langmuir isotherm *** maximum adsorption occurs at pH3,and then the adsorption capacity of PEI-Pal was decreased with the increase of p H *** adsorption kinetics of Cr(VI)on PEI-Pal was modeled with pseudo-second-order *** addition of Cl^-,SO4^2-and PO4^3-reduced the Cr(VI)adsorption by competition with Cr(VI)for the active sites of *** Cr(VI)saturated PEI-Pal can be regenerated in alkaline solution,and the adsorption capacity can still be maintained at 30.44 mg·g^-1 after 4 *** results demonstrate that PEI-Pal can be used as a potential adsorbent of Cr(VI)in aqueous solutions.

关键词： Palygorskite Polyethyleneimine Adsorption Cr(VI)

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Tetraethylenepentamine-functionalized magnetic mesoporous composites as a novel adsorbent for the removal Cr(Ⅲ)-ethylenediaminetetraacetic acid in complex solution

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Chinese Journal of Chemical Engineering 2024年第4期68卷 16-26页

作者： Zhi Hu Jiahong Wang Tongtong Sun School of Environmental Science and Engineering Shaanxi University of Science&TechnologyXi'an 710021China shaanxi key laboratory of green preparation and functionalization of inorganic materials Xi'an 710021China

A novel tetraethylenepentamine(TEPA) functionalized magnetic mesoporous silica adsorbent(FNMs/TEPA) was prepared for the adsorption of Cr(Ⅲ)-ethylenediaminetetraacetic acid(EDTA)from wastewater. The characterization of the prepared adsorbent certified that TEPA was modified onto the magnetic mesoporous silicon(FNMs), while FNMs/TEPA maintained the ordered mesoporous and pristine magnetic properties. The batch adsorption experiments demonstrated that TEPA significantly enhanced the removal capacity of the adsorbent for Cr(Ⅲ)-EDTA. FNMs/TEPA exhibited an excellent adsorption property(13.84 mg·g-1) at p H 4.0. Even in the presence of high concentrations of coexisting ions and organic acids, the adsorption performance of FNMs/TEPA was stable. Experimental characterization and DFT demonstrated that the adsorption of Cr(Ⅲ)-EDTA was ascribed to the electrostatic interaction, hydrogen bonding, and complexation between Cr(Ⅲ)-EDTA and amino groups on the adsorbent surface. The analysis of the independent gradient model(IGM) shows that electrostatic interaction is the main mode of action in the adsorption process. Moreover, FNMs/TEPA demonstrated remarkable reusability in three regeneration cycles. These findings indicated that FNMs/TEPA possessed excellent application prospects in the disposal of wastewater containing Cr(Ⅲ)-EDTA.

关键词： TEPA functionalized magnetic mesoporous silicon Adsorption Cr(III)-EDTA Density functional theory calculations

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preparation of CeO_(2) abrasives by reducing atmosphere-assisted molten salt method for enhancing their chemical mechanical polishing performance on SiO_(2)substrates

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Journal of Rare Earths 2023年第10期41卷 1627-1635,I0006页

作者： Ning Xu Jiahui Ma Qi Liu Yuxin Luo Yongping Pu School of Material Science and Engineering Shaanxi University of Science&TechnologyXi'an710021China shaanxi key laboratory of green preparation and functionalization for inorganic materials Xi'an710021China

Ce^(3+)as the active site on the CeO_(2)abrasive surface is the key to enhancing the material removal rate(MRR).The CeO_(2)abrasives with high chemical activity were prepared by the molten salt method under a reducing *** crystal structure and morphology of CeO_(2)abrasive s were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),Fourier transform infrared spectroscopy(FT-IR),ultraviolet—visible diffuse reflectance spectroscopy(UV-Vis DRS),and X-ray photoelectron spectroscopy(XPS).The CeO_(2)abrasives were obtained under different atmospheres(Air,Ar,and Ar/H_(2)).With the enhancement of the reducing atmosphere,the morphology of the abrasives transforms from spherical to octahedral,while more oxygen vacancies and Ce^(3+)are generated on the surface of CeO_(2)*** CMP experiments show that the MRRs of the CeO_(2)-Air,CeO_(2)-Ar,and CeO_(2)-Ar/H_(2)abrasives on SiO_(2)substrates are 337.60,578.74,and 691.28 nm/min,***,as confirmed by atomic force microscopy(AFM),the substrate surfaces exhibit low roughness(20.5 nm)after being polished using all of the prepared ***,the MRR of CeO_(2)-Ar/H_(2)abrasives is increased by 104.76%compared with CeO_(2)-air *** improved CMP performance is attributed to the increased Ce^(3+)concentration and the octahedral morphology of the abrasives enhancing the chemical reaction and mechanical removal at the abrasive-substrate interface.

关键词： CeO_(2) Chemical mechanical polishing(CMP) Reducing atmosphere Material removal rate(MRR) Molten salt method Rare earths

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Novel advances in metal-based solar absorber for photothermal vapor generation

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Chinese Chemical Letters 2020年第9期31卷 2159-2166页

作者： Zhengtong Li Chengbing Wang School of materials Science&Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialShaanxi University of Science&TechnologyXi'an 710021China

Access to safe drinking water has become an extremely urgent research topic wo *** recent years,the technology of solar vapor generation has been extensively explored as a potential and effective strategy of transforming elements content in *** this review,the basic concepts and theories of metal-based photothermal vapor generation device(PVGD) with excellent optical and thermal regulatory are *** the view of optical regulation,how to achieve high-efficiency localized evaporation in different evaporation system(i.e.,volumetric solar heating and interface solar heating) is discussed;from the aspect of thermal regulation,the importance of selective absorption surface for interfacial PVGD is *** on the above discussion and analysis,we summarize the challenges of metal-based desalination device.

关键词： Solar vapor generation Plasmonic effect Optical adjustment Solar selective absorption surface Interfacial evaporation

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