The Experts below are selected from a list of 54 Experts worldwide ranked by ideXlab platform
Qifang Li - One of the best experts on this subject based on the ideXlab platform.
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Improving Dielectric and Mechanical Properties of CaCu3Ti4O12 Nanowire/Epoxy Composites through a Surface-Polymerized Hyperbranched Macromolecule
ACS Applied Electronic Materials, 2019Co-Authors: Liuyang Li, Zheng Zhou, Guangxin Chen, Qifang LiAbstract:A core–shell structured organic–inorganic hybrid, that is, a Hyperbranched aromatic polyamide (HB-Pa)-coated calcium copper titanate nanowire (CCTO NW), was prepared through a two-step solvent-thermal method followed by in situ polymerization. The morphology and structure of CCTO NWs and HB-Pa-coated CCTO NWs (HB-Pa@CCTO NWs) were characterized by transmission electron microscopy and Fourier transform infrared spectroscopy. The high dielectric constant composites with notable mechanical properties were fabricated based on the epoxy resin (EP) matrix by using the core–shell structured HB-Pa@CCTO NWs as dielectric filler. At the same mass fraction, the composites filled with HB-Pa@CCTO NWs exhibited more excellent dielectric and mechanical properties than those filled only with synthesized CCTO NWs. At 40 wt % HB-Pa @CCTO NWs content, a relatively high dielectric constant (18) and a low dielectric loss (0.05) at 1 kHz were synchronously obtained. The simultaneous increases in dielectric and mechanical prope...
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improving dielectric and mechanical properties of cacu3ti4o12 nanowire epoxy composites through a surface polymerized Hyperbranched Macromolecule
ACS Applied Electronic Materials, 2019Co-Authors: Liuyang Li, Zheng Zhou, Guangxin Chen, Qifang LiAbstract:A core–shell structured organic–inorganic hybrid, that is, a Hyperbranched aromatic polyamide (HB-Pa)-coated calcium copper titanate nanowire (CCTO NW), was prepared through a two-step solvent-thermal method followed by in situ polymerization. The morphology and structure of CCTO NWs and HB-Pa-coated CCTO NWs (HB-Pa@CCTO NWs) were characterized by transmission electron microscopy and Fourier transform infrared spectroscopy. The high dielectric constant composites with notable mechanical properties were fabricated based on the epoxy resin (EP) matrix by using the core–shell structured HB-Pa@CCTO NWs as dielectric filler. At the same mass fraction, the composites filled with HB-Pa@CCTO NWs exhibited more excellent dielectric and mechanical properties than those filled only with synthesized CCTO NWs. At 40 wt % HB-Pa @CCTO NWs content, a relatively high dielectric constant (18) and a low dielectric loss (0.05) at 1 kHz were synchronously obtained. The simultaneous increases in dielectric and mechanical prope...
Zhiliang Zhang - One of the best experts on this subject based on the ideXlab platform.
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controllable synthesis of silver nanoparticles in Hyperbranched Macromolecule templates for printed flexible electronics
RSC Advances, 2015Co-Authors: Zhiliang Zhang, Huayong ZhangAbstract:In this work, a series of different generation Hyperbranched Macromolecules were synthesized and exploited for the template-directed synthesis of silver nanoparticles (AgNPs). The results obtained from UV-vis spectra, transmission electron microscopy and scanning electron microscopy images showed that the synthesized AgNPs was nearly uniform, monodisperse and the mean AgNP size was 31.2 ± 3.6, 25.6 ± 2.7 and 21.8 ± 2.2 nm, corresponding to the respective generation of Hyperbranched Macromolecules employed. Based on the as-synthesized AgNPs, a sequence of flexible electrocircuits were successfully fabricated by ink-jet printing technique and exhibited very low resistivity in the range of 8.26 × 10−8–7.62 × 10−8 Ω m after laser sintering treatment. This method provided a facile and efficient strategy to synthesize uniform and monodisperse AgNPs, and would have enormous potential in applications for flexible electronics, electrochemical devices and biosensor assembly.
Liuyang Li - One of the best experts on this subject based on the ideXlab platform.
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Improving Dielectric and Mechanical Properties of CaCu3Ti4O12 Nanowire/Epoxy Composites through a Surface-Polymerized Hyperbranched Macromolecule
ACS Applied Electronic Materials, 2019Co-Authors: Liuyang Li, Zheng Zhou, Guangxin Chen, Qifang LiAbstract:A core–shell structured organic–inorganic hybrid, that is, a Hyperbranched aromatic polyamide (HB-Pa)-coated calcium copper titanate nanowire (CCTO NW), was prepared through a two-step solvent-thermal method followed by in situ polymerization. The morphology and structure of CCTO NWs and HB-Pa-coated CCTO NWs (HB-Pa@CCTO NWs) were characterized by transmission electron microscopy and Fourier transform infrared spectroscopy. The high dielectric constant composites with notable mechanical properties were fabricated based on the epoxy resin (EP) matrix by using the core–shell structured HB-Pa@CCTO NWs as dielectric filler. At the same mass fraction, the composites filled with HB-Pa@CCTO NWs exhibited more excellent dielectric and mechanical properties than those filled only with synthesized CCTO NWs. At 40 wt % HB-Pa @CCTO NWs content, a relatively high dielectric constant (18) and a low dielectric loss (0.05) at 1 kHz were synchronously obtained. The simultaneous increases in dielectric and mechanical prope...
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improving dielectric and mechanical properties of cacu3ti4o12 nanowire epoxy composites through a surface polymerized Hyperbranched Macromolecule
ACS Applied Electronic Materials, 2019Co-Authors: Liuyang Li, Zheng Zhou, Guangxin Chen, Qifang LiAbstract:A core–shell structured organic–inorganic hybrid, that is, a Hyperbranched aromatic polyamide (HB-Pa)-coated calcium copper titanate nanowire (CCTO NW), was prepared through a two-step solvent-thermal method followed by in situ polymerization. The morphology and structure of CCTO NWs and HB-Pa-coated CCTO NWs (HB-Pa@CCTO NWs) were characterized by transmission electron microscopy and Fourier transform infrared spectroscopy. The high dielectric constant composites with notable mechanical properties were fabricated based on the epoxy resin (EP) matrix by using the core–shell structured HB-Pa@CCTO NWs as dielectric filler. At the same mass fraction, the composites filled with HB-Pa@CCTO NWs exhibited more excellent dielectric and mechanical properties than those filled only with synthesized CCTO NWs. At 40 wt % HB-Pa @CCTO NWs content, a relatively high dielectric constant (18) and a low dielectric loss (0.05) at 1 kHz were synchronously obtained. The simultaneous increases in dielectric and mechanical prope...
Hua Wang - One of the best experts on this subject based on the ideXlab platform.
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synthesis and oxidative stability of Hyperbranched Macromolecule bridged hindered phenols
New Journal of Chemistry, 2017Co-Authors: Cuiqin Li, Hua Wang, Weiwei Kang, Zhiqiu Zhang, Jun WangAbstract:A series of Hyperbranched Macromolecule-bridged hindered phenols was successfully synthesized with 3-(3,5-di-tert-butyl-4-hydroxy-phenyl)-propionyl chloride and a series of 1.0 generation (1.0G) Hyperbranched Macromolecules. Their antioxidant ability was investigated by DPPH˙ scavenging assay and oxygen uptake test to establish the correlation between the alkyl-chain length of the core in the bridged group and antioxidant property of Hyperbranched Macromolecule-bridged hindered phenols. Effective concentration that scavenges 50% radical (EC50), reaction rate that scavenges 50% radical (TC50) and antiradical efficiency (AE) have been reported with DPPH˙ assay, and the results indicate that the antioxidant activity decreased with an increase in the alkyl-chain length of the bridged groups. The inhibition period (tinh), the rate constant of inhibition (kinh) and the stoichiometric factor (n) were used to evaluate the ability of inhibiting styrene against AIBN-induced oxidation for Hyperbranched Macromolecule-bridged hindered phenols. The results showed that the steric effect of the Hyperbranched Macromolecule-bridged hindered phenols increased with an increase in the alkyl-chain length of the bridged groups, which led to a decline in the reactivity between the hindered phenols and free radicals produced in the AIBN-induced oxidation process of styrene. For the simple free radical systems, the oxidative stabilities of the Hyperbranched Macromolecule-bridged hindered phenols decreased with an increase in the alkyl-chain length of the bridged groups.
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Reversible and Multisensitive Quantum Dot Gels
Macromolecules, 2011Co-Authors: Hua Wang, Qing-hui ZhouAbstract:Functional fluorescent semiconductor quantum dot (QD) based gels prepared via immobilizing QDs in organic matrices have shown promising properties, but the compatibility of QDs and organic matrix is not good, and the interactions of the ligands on the surface of QDs with organic matrix are weak, which lead to poor dispersion of QDs in the formed gel and decrease of photoluminescence after gelation in some cases. In this work, we report a Hyperbranched Macromolecule that can not only act as an excellent ligand to stabilize QD but also act as a good gelator that can gel QD solution to form a reversible and multiresponsive fluorescent gel. This Hyperbranched Macromolecule-capped QD is stable, and the sol–gel switching can be easily realized via heating and ultrasonicating. Most important, the formed QD gel shows stronger fluorescence than that of the corresponding solution. This novel QD-Hyperbranched Macromolecule inorganic/organic hybrid network shows great promise in fields such as imaging, sensors, drug ...
Jia Ling Pu - One of the best experts on this subject based on the ideXlab platform.
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Synthesis and Mesogenic Properties of a Novel Hyperbranched Triphenylene-Based Discotic Liquid Crystal
Key Engineering Materials, 2010Co-Authors: Chunxiu Zhang, Jia Ling Pu, Zhi Qun He, Ming Zhang, Hao Wu, Ya Nan LiAbstract:A novel triphenylene-based hyper-branched Macromolecule was synthesized from the functional compound-2, 6, 10-trihydroxy-3, 7, 11–tris (pentyloxy) triphenylene serving as core, using α,ω-dibromodecane as spacer and 1-bromopentane as terminal group for end capping by using a very simple synthesis method, one-pot reaction. The structure of the Hyperbranched Macromolecule was determined by FTIR and 1HNMR. The molecule weight and the molecular weight distribution were measured by GPC. Mesophase and their structural orders were determined using a polarized optical microscope and a differential scanning calorimeter.
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Observation of disorder effects on charged carrier mobility in triphenylene-based discotic materials
Journal of Luminescence, 2006Co-Authors: Chunxiu Zhang, Zhi Qun He, Junjie Wang, Dong-dong Wang, Yongsheng Wang, Zhongxiao Li, Jia Ling PuAbstract:Abstract A discotic 2,6,10-trihydroxy-3,7,11-tripentyloxytriphenylene material and a triphenylene-based Hyperbranched Macromolecule were synthesized, in which the latter was prepared from AB m molecules in a one-pot reaction. Adipic chloride and butyryl chloride were chosen as terminal groups to the 2,6,10-trihydroxy-3,7,11-tripentyloxytriphenylene. Mesophase and their structural orders were determined using a polarized optical microscope and a differential scanning calorimeter. Carrier mobilities of the pure and composite materials were measured via a time-of-flight method. A change in carrier mobility on the morphology of the materials was further discussed. It was found that degree of crystallization was the key for a discotic triphenylene material to possess charge-transporting properties, no matter it is ordered or disordered.