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| 1 | Local Structure Analysis of Lead Zinc Niobate-Barium Titanate Ceramic by X-Ray Absorption Spectroscopy and Density Functional Calculation显示文摘The local structure of an alternative Pb(Zn_(1/3)Nb_(2/3))O3-based perovskite ceramic is investigated. The 0.07 BaTiO_3-0.93 Pb(Zn_(1/3)Nb_(2/3))O_3 ceramic is synthesized using a combination of Zn_3 Nb_2 O_8 B-site precursor and BaTiO_3 perovskite phase stabilizer. Then, x-ray absorption spectroscopy and density functional theory are employed to calculate the local structure configuration and formation energy of the prepared samples. Ba2+ is found to replace_Pb)^(2+) in A-site with Zn^(2+) occupying B-site in Pb(2 n_(1/3)Nb_(2/3))O_3, while in the neighboring structure, Ti^(4+)replaces Nb^(5+) in B-site with Pb^(2+) occupying A-site. With the substitution of BaTiO_3 in Pb(Zn_(1/3)Nb_(2/3))O_3, the bond length between Zn2+ and Pb^(2+) is longer than that of the typical perovskite phase of Pb(Zn_(1/3)Nb_(2/3))O_3.This indicates the key role of BaTiO_3 in decreasing the steric hindrance of Pb^(2+) lone pair, and the mutual interactions between Pb^(2+) lone pair and Zn2+ and the formation energy is seen to decrease. This finding of the formation energy and local structure configuration relationship can further extend a fundamental understanding of the role of BaTiO_3 in stabilizing the perovskite phase in PbZn_(1/3)Nb_(2/3)O_3-based materials,which in turn will lead to an improved preparation technique for desired electrical properties. | Kanokwan Kanchiang Phakkhananan Pakawanit Rattikorn Yimnirun | 2017 | Chinese Physics Letters2017，34，8： | 0 |
| 2 | Fabrication of fluoroalkylsilane/zeolitic imidazolate framework composites for highly efficient superhydrophobic coating显示文摘Superhydrophobic bagasse paper was successfully engineered by facile spray coating with a zeolitic imidazolate framework composite modified by 3,3,3-trifluoropropyltrimethoxysilane(FAS)and used as a filter membrane with special wettability for oil/water separation.Surface characteristics such as surface morphology,surface moieties,roughness,and wettability were observed.The addition of FAS decreased the apparent surface energy between solid surfaces and liquids with a polar contribution of surface free energy as low as 0 mN m−1.The formation of the FAS layer was confirmed by transmission electron microscopy and X-ray photoelectron spectroscopy core-level spectra.Three-dimensional surface topography revealed an increase in the spray coating cycle that enhanced the hydrophobicity of the coated paper.The results confirmed that not only microstructures but also the presence of functional groups with low surface energy(such as FAS)can promote surface hydrophobicity.The spray-coated paper with FAS/ZIF in the presence of a small amount of nanocellulose provided a superhydrophobic surface after the first spray cycle.The separation efficiency was up to 85%and was slightly affected by oil viscosity.Moreover,this can be used as a filter membrane for water-in-oil emulsions.In the present work,simple spray-coated paper is a promising candidate material for gravity-driven oil/water separation and water repellent coating. | Preyaphan Kheaw-in Chanatip Samart Narong Chanlek Phakkhananan Pakawanit Prasert Reubroycharoen Guoqing Guan Suwadee Kongparakul Suda Kiatkamjornwong | 2022 | Carbon Resources Conversion2022，5，1： | 0 |
| 3 | Tailoring charge affinity,dielectric property,and band gap of bacterial cellulose paper by multifunctional Ti_(2)NbO_(7)nanosheets for improving triboelectric nanogenerator performance显示文摘Transparent,flexible,and high-performance triboelectric nanogenerator(TENG)from nature-derived materials are required for sustainable society development.However,low triboelectricity from natural material is generally observed.Tunable electronic band diagram(EBD)through facile manipulation is one of the efficient methods to promote the TENG output,requiring fundamental,in depth understanding.Herein,we employed the high quality,single crystal-like Ti_(2)NbO_(7)nanosheets(NSs)with dual dielectric and semiconducting properties as filler for bacterial cellulose(BC)-based TENG.Several techniques including X-ray diffraction(XRD),scanning electron microscopy(SEM),atomic force microscopy(AFM),ultraviolet–visible(UV–vis)absorption,energy dispersive X-ray spectroscopy(EDS),and synchrotron radiation X-ray tomographic microscopy(SRXTM)were applied to characterize the long-range structure,microstructure,optical properties,elemental composition,and three-dimensional(3D)distribution of components in the composites.The semi-transparent and flexible 5 vol.%Ti_(2)NbO_(7)NSs/BC preserved the integrity of cellulose,contained well-dispersed nanosheets,reduced optical band gap(4.20 vs.5.75 eV for BC),and increased surface roughness.The dielectric permittivity and conductivity increased with nanosheets content.Adding negatively-charged Ti_(2)NbO_(7)NSs could regulate the charge affinity of BC composite via shifting of Fermi energy over that of Al.It is found that adding 5 vol.%NSs into the BC film improved electrical outputs(~36 V and~8.8μA),which are 2–4 times higher than that of pure BC,even when paired with Al which lies adjacent in triboelectric series.Our work demonstrated the method to enhance BC-based TENG performance through EBD regulation using multifunctional Ti_(2)NbO_(7)NSs. | Saichon Sriphan Utchawadee Pharino Thitirat Charoonsuk Phieraya Pulphol Phakkhananan Pakawanit Orawan Khamman Wanwilai Vittayakorn Naratip Vittayakorn Tosapol Maluangnont | 2023 | Nano Research2023，16，2： | 0 |
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