ADVANCED POWDER TECHNOLOGY
·
2016
·
IF 2.478
Wei Chen,Xiaoping Zhang,Mairambek Mamadiev,Chunhu Zhao,Zihao Wang,Hanjiang Xu
Layers from two different delaminated dispersions of 3-aminopropyltriethoxysilane (APTES)-intercalated montmorillonite (Mts) and octylamine (OA)-intercalated graphene oxide (GO) could be co-stacked to obtain APTES-intercalated Mts (Mts-APTES)/OA-intercalated GO (GO-OA) interstratified composites (MAGO). The synthesized composites were characterized by XRD, FTIR, BET, TGA, TEM and XPS, which showed that MAGO had been prepared successfully. The optimal concentration of APTES was 8% in anhydrous toluene which avoided self-polymerization of APTES while facilitating the nucleophilic attack of APTES amine groups and the protic character of ethanol to compete with silane for the intimal hydroxyl groups by H-bonding. The MAGO demonstrated an extremely fast Cr(VI) removal from aqueous solution with a high removal efficiency at low pH. Data from batch studies of the adsorption process followed pseudo-second-order kinetics. The results fit a Langmuir model of adsorption, with maximum adsorption capacities of MAGO composites at pH 3.0 being 44.25 mg g −1 , 47.46 mg g −1 , 49.58 mg g −1 under 30 °C, 40 °C, 50 °C, respectively, which were much higher than capacities of some conventional adsorbents. The reusability of the MAGO composite was also determined through adsorption-desorption studies, providing evidence for the potential use of MAGO composite in the removal of Cr(VI) from acidic wastewater.
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Materials Science & Engineering C-Materials for Biological Applications
·
2016
·
IF 3.42
Kai Chen,Jiacheng Li,Yuhong Feng,Furui He,Qingfeng Zhou,Dunchao Xiao,Yiyuan Tang
Amphiphilic polymers that form self-assembled structures in aqueous media have been investigated and used for the diagnosis and therapy of various diseases, including cancer. In our work, a series of environment-sensitive hydrophobic alginates (Ugi-Alg) with various weight-average molecular mass values (Mw ~ 6.7 × 10 5 –6.7 × 10 4 g/mol) were synthesized via Ugi reaction. The structure of Ugi-Alg was characterized by 1 HNMR spectrometer. The electrostatic self-assembly of different molecular weight (Mw) and composition (M/G ratio) of Ugi-Alg chain under various Na + concentrations, was investigated by dynamic light scattering, electron spin resonance experiments, and transmission electron microscopy. Result showed that by comparing to other Ugi-Alg, the mid-Mw Ugi-Alg (Mw ~ 2.8 × 10 5 g/mol) could form stable and homogeneous nanoparticles in low Na + concentration solution. However, G/M values exerted no obvious effect on nanoparticles structure. Additionally, steady-shear flow, thixotropy and dynamical viscoelasticity tests were performed to characterize the rheological behavior of Ugi-Alg aqueous solutions as influenced by Mw and M/G ratio. All of the samples exhibited a non-Newtonian shear-thinning behavior above a critical shear rate ( γ ̇ c 2 ). The greater the Mw, the more sensitive the temperature-dependent behavior will be. The upward-downward rheograms showed that all of the systems evaluated in this study displayed a hysteresis loop, indicating a strong thixotropic behavior, and the thixotropic of mid-Mw Ugi-Alg was the strongest. The dynamical viscoelastic properties were characterized by oscillatory frequency sweep, revealing the gel-like viscoelastic behavior of mid-low Ugi-Alg and the fluid-like viscoelastic behavior of high-Mw Ugi-Alg.
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PubMed
高影响因子
RSC Advances
·
2017
·Vol. 7
·期 77
·49074-49082
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IF 3.108
Yizhou Huang,Yazhou Tian,Yuanyuan Li,Xiaocun Tan,Qing Li,Jue Cheng,Junying Zhang
A series of epoxy systems with tunable rigid-flexibility were prepared by the curing reaction of bisphenol F diglycidyl (DGEBF), a single-ended amine with alkyl chains (n-butyl, octyl, dodecyl), 4,4′-diaminodiphenylmethane (DDM) and 4,4′-diaminodicyclohexylmethane (H-DDM). By means of adjusting the composition of the curing agent (the molar ratio between H-DDM and DDM), nano- and submicron-sized phase separations were observed by atomic force microscopy (AFM). And diffraction peaks were not observed in the wide angle X-ray scattering (WAXS) characterization which revealed that there was no crystallization in the modified epoxy resin. Besides, the result of nanoIR characterization proved that the aggregation of aliphatic chains led to the microphase separation structure, which can remarkably improve the mechanical properties of epoxy resins. The effects of side chains on the mechanical and thermal properties of epoxy networks were investigated. Especially, the EC8-5′ (the molar ratio between H-DDM and DDM was 45/55, the mass ratio of the n-octyl amine to DGEBF was 5 : 100) sample exhibited splendid mechanical properties with an attractive tensile strength of 88.4 MPa, an elongation at break of 6.6% and a tensile modulus of 3.5 GPa.
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THERMOCHIMICA ACTA
·
2017
·
IF 2.236
Bin Xu,Boyi Wang,Caixia Zhang,Jing Zhou
In this study, we adopted the organic precursor thermal decomposition method to prepare Cu 2 O-Cu-MWCNTs/paraffin light-thermal conversion phase change material via one-step. The phase, micro morphology, phase change behavior, thermal reliability and thermal stability of the products were respectively characterized by XRD, SEM, DSC and TGA. We also investigated their light-thermal conversion properties. The results indicated when the content of precursor was 0.005 mol and 0.01 mol, the average particles size of hybird particles (Cu and Cu 2 O) were 30 nm and 400 nm, respectively. It was also found that the light-heat conversion performance of Cu 2 O-Cu-MWCNTs/paraffin were better than that of MWCNTs/paraffin with the same mass fraction. After we conducted analyses of UV–vis diffuse reflection spectra and thermal conductivity, We attributed the better light-heat conversion performance of Cu 2 O-Cu-MWCNTs/paraffin to the high light absorption ability of Cu 2 O and the reduction of interface thermal resistance between MWCNTs and paraffinresulting from Cu and Cu 2 O decorated MWCNTs.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 12
·3035-3041
·
IF 5.256
Kaisi Liu,Bin Yao,Yongfeng Li,Zhanhui Ding,Hao Sun,Yuhong Jiang,Gang Wang,Daocheng Pan
Herein, we successfully prepared dithiocarbamate-based Cu2ZnSnS4 (CZTS) precursor solutions using various amino groups such as methylamine, ethylamine, propylamine, butylamine, amylamine, hexylamine, octylamine, and ethanolamine. These solutions exhibited a distinguishing wetting behavior, viscosity, and stability and could be used to fabricate CZTS thin films by a simple spin-coating and annealing process. We compared the thermogravimetric analysis of the precursor solutions and the XRD patterns of the as-prepared CZTS films and clear differences between the samples were observed. Furthermore, we fabricated high-quality CZTS films using the ethanoldithiocarbamate-based CZTS precursor solution, and the Cu2ZnSn(S,Se)4 solar cell with the best power conversion efficiency (7.66%) under 1.5 AM illumination was achieved.
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Journal of Materials Chemistry C
·
2017
·Vol. 5
·期 46
·12044-12049
·
IF 5.256
Hai Wang,Hechun Lin,Xianqing Piao,Pei Tian,Minjie Fang,Xue’e An,Chunhua Luo,Ruijuan Qi,Ye Chen,Hui Peng
Organometal halide perovskites, as promising semiconductor materials for achieving future low-cost optoelectronic devices, suffer from inherent instability and undergo extremely fast degradation under exposure to moisture, UV light, or high temperature. Herein, we present a facile and low cost approach for the preparation of perovskite-based composite films via blending CH3NH3PbBr3 nanocrystals (MAPbBr3 NCs) with two kinds of commercially available silicone resins. The highest photoluminescence quantum yield of the prepared composite films is up to 62%. The composite films of MAPbBr3 NCs with phenyl methyl silicon resin (PMSR) show unprecedented stability against water, heat and UV exposure. Their applications as paints or as phosphors for the fabrication of green and white light LEDs are demonstrated.
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Small
·
2016
·Vol. 13
·期 6
·1602637
·
IF 8.315
Junli Liu,Yong Yang,Bing Ni,Haoyi Li,Xun Wang
Graphical Fullerene-like nickel oxysulfide hollow nanospheres with ≈50 nm are constructed by in situ growth on the surface of nickel foam by taking advantage of solvothermal reaction. The as-prepared composite exhibits exhilaratingly high HER and OER performance in 1 m KOH, which opens up a very promising aspect for non-noble metal chalcogenides as bifunctional electrocatalysts.
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PubMed
高影响因子
Advanced Optical Materials
·
2016
·Vol. 4
·期 11
·1732-1737
·
IF 5.359
Wen-Gao Lu,Cheng Chen,Dengbao Han,Linhua Yao,Junbo Han,Haizheng Zhong,Yongtian Wang
Graphical The comparison between organic–inorganic CH 3 NH 3 PbBr 3 quantum dots and all inorganic halide perovskite CsPbBr 3 quantum dots allows to understand the structural difference and corresponding optical properties. Using Z-scan measurements, it is revealed that colloidal CH 3 NH 3 PbBr 3 exhibits enhanced two-photon absorption properties compared to those of CsPbBr 3 quantum dots due to their structural difference.
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BULLETIN OF THE KOREAN CHEMICAL SOCIETY
·
2017
·Vol. 38
·期 7
·700-705
·
IF 0.602
Sheng Wang,Yanbing Lv,Ruili Wu,Lin Song Li,Huaibin Shen,Ming Xing,Xia Chen
The high-quality green-emitting CdS 0 . 5 Se 0 .5 /8Zn 1 − x Cd x S/2ZnS QDs with “8” and “2” monolayers (ML) of corresponding shell were first synthesized by “thermal-cycling coupled single precursor” (TC-SP) approach. The component-gradient Zn 1− x Cd x S interlayer played a key role in the growth of thick shell by gradually buffering the large lattice mismatch (~9%) between the CdS 0 . 5 Se 0 .5 core and ZnS shell. Moreover, the Zn 1− x Cd x S gradient interlayer as well as ZnS outshell increased the potential barrier to prevent excitons from being trapped by surface defects. The photoluminescence quantum yields of the as-synthesized CdS 0 . 5 Se 0 .5 /8Zn 1 − x Cd x S/2ZnS core/shell QDs can reach to 70% in organic media and still maintain 60% after aqueous phase transfer. The green-emitting CdS 0 . 5 Se 0 .5 /8Zn 1 − x Cd x S/2ZnS core/shell QDs may be good candidates for applications of biomedical and photoelectric field.
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MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Xiaofei Ma,Wenyi Wu,Qin Wang,Jinqiu Xu,Liangliang Cai
This study integrated a chiral selector with micelle pseudostationary phase to develop a novel chiral separation method in capillary electrophoresis. A new type of nanomicelles materials was prepared via amidation reaction using the carboxymethyl-β-cyclodextrin (CM-β-CD) as the hydrophilic group and long chain fatty amines as the hydrophobic group. This novel amide compound self-assembled into nanomicelles in a buffer solution, acting as both a chiral selector and pseudostationary phase. The separations of model drugs were notably improved when compared to the single CM-β-CD system and CM-β-CD/sodium dodecyl sulfate micellar electrokinetic capillary chromatograph system. This study optimized several separation parameters and comprehensively characterized the nanomicelles through several methods such as infrared spectroscopy, nuclear magnetic resonance spectroscopy, particle size determination, and transmission electron microscopy (TEM). Additionally, amlodipine was chosen as the model analyte to determine drug loading in both the single CM-β-CD system and the nanomicelles system using high performance liquid chromatography. The findings indicated that nanomicelles exhibited superior drug loading capacity. The particle size and TEM analysis visually confirmed the distribution of enantiomers in the hydrophobic core of nanomicelles. The proposed nanomicelles showed promise in chiral separation and this strategy opened up new pathways for the development of functional chiral materials.
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ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Jianyong Pan,Jingyang Hu,Xinning Dong,Yuhui Wang,Xiaoyu Zhang,Martyn A. McLachlan,Zhongrui Wang,Jiaqi Zhang,Lijun Zhang
Memristors based on perovskite materials demonstrate significant potential for applications in information encryption and storage. However, the stability and durability of their device structures remain major challenges for commercial deployment. In this study, Mn:CsPbCl 3 perovskite nanocrystals capped with short-chain ligands are synthesized at a controlled ratio using an in situ ligand passivation strategy. Compared with long-chain ligands, short-chain ligands possess higher surface adsorption energy, which enhances nanocrystal size uniformity and enables more effective attachment to the perovskite surface at adsorption sites. This process mitigates surface defects in the nanocrystals, thereby decreasing the randomness in conductive filaments formation and enhancing device stability. Furthermore, short-chain ligand capping improves the contact at the material-electrode interface correspondingly reducing leakage current. The fabricated short-chain Al/Mn:CsPbCl 3 /FTO memristor exhibits good reconfigurable storage behavior. By adjusting the compliance current, a transition from non-volatile to volatile storage modes is successfully achieved. Leveraging the device's electrical characteristics, binary image encryption, and storage functions are realized. Overall, this work demonstrates the importance of surface defects on the operational stability of nanocrystal memristors and provides a foundation for the application of perovskite memristors in information encryption and secure transmission.
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Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2025
·
IF 4.6
Shuang Xi,Xingwang Shen,Junjie Li
There are inevitable cracking defects in pressureless bonded joints with single nanoparticle system silver (Ag) pastes, which could potentially compromise the long-term service reliability of the bonded joints. To address this issue, a novel hybrid Ag paste suitable for pressureless sintering was developed by introducing micron Ag flakes into the modified Ag nanoparticles. The effects of process parameters, such as the mass ratio of Ag nanoparticles to micron-sized Ag flakes in the paste and the sintering time, on the electrical performance of the sintered films and the bonding performance of the joints were investigated. The mechanism of sintering reliability enhancement of micro-nano hybrid Ag paste was also investigated. After a long time of high-temperature aging, micro-nano hybrid Ag paste joints with optimized micro/nano ratio exhibit reduced surface defects (with porosity of 22.19 % for hybrid Ag paste joints while 28.67 % for nano-Ag paste joints), which contributes to the enhanced mechanical stability compared to nano-Ag paste bonded joints (with shear strength of 45.78 MPa for hybrid Ag paste joints while 33.38 MPa for nano-Ag paste joints). The obtained hybrid Ag paste with high mechanical service reliability and superior repeatability would find a broad application prospect in the field of power device packaging.
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危险品化学品经营许可证（带存储）