COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2017
·
IF 2.714
Jingwen Song,Kai Ma,Tifeng Jiao,Ruirui Xing,Lexin Zhang,Jingxin Zhou,Qiuming Peng
Graphene oxide (GO)-based nanocomposite films via facile and appropriate self-assembly methods have demonstrated many potential applications in wide fields. This study demonstrates a facile and clean route to prepare graphene oxide-dye composite films using Langmuir-Blodgett (LB) technique at room temperature. By electrostatic interaction between cationic dye molecules and negatively charged GO sheets as well as π-π interactions, GO-dye composite LB films were formed spontaneously. As a soft platform for dye molecules, GO sheets induce dye molecules to self-assemble and form highly ordered structures containing H-aggregates and/or J-aggregates. The morphological characterization results show the formation of GO-dye composite films with smooth and dense surfaces. And the spectral results reveal that dye molecules stack in well-organized aggregates on the surface of GO sheets corresponding to monomers in bulk solution. The present research work about GO-dye composite films by LB method may provide new clues to prepare organized composite films and demonstrate potential applications in many fields.
研究领域:
材料科学
·
纳米科技
·
表面化学
·
胶体与界面科学
·
功能薄膜
✓ 已验证
DOI
高影响因子
JOURNAL OF SOLID STATE CHEMISTRY
·
2021
·
IF 3.498
Sai-Li Zheng,Yonghe He,Xiao-Kang Qiu,Yuan-Hui Zhong,Lai-Hon Chung,Wei-Ming Liao,Jun He
A novel metal-organic framework [CuCN(TMBP)·H 2 O] n ( TCuCN ) has been synthesized by the reaction of 3,3′,5,5′-tetramethyl-4,4′-bipyrazole (TMBP) and CuCN. Its structure was determined by single-crystal X-ray diffraction (SCXRD) analysis and further characterized by power X-ray diffraction (PXRD) analysis, FT-IR spectroscopy and thermogravimetric (TG) analysis. Previously reported structurally analogous TCuCl , TCuBr , TCuI have also been synthesized for Br 2 adsorption comparison. All of these four MOFs exhibited reversible uptake of Br 2 vapor judging by the unchanged PXRD patterns . Among four MOFs, Br 2 -loaded TCuI showed the most uptake amount of Br 2 (15.7 wt%), providing the formula to be TCuI ·0.33Br 2 . The different uptake amount of Br 2 for TCuX (X = CN, Cl, Br, I) should be mainly ascribed to the intermolecular interaction between CuX and Br 2 .
研究领域:
无机化学
·
材料化学
·
配位化学
·
多孔材料
·
气体吸附
✓ 已验证
DOI
高影响因子
Small Methods
·
2018
·Vol. 2
·期 6
·1800017
·
IF 0
Pingan Zhu,Tiantian Kong,Chunmei Zhou,Leyan Lei,Liqiu Wang
Natural systems have exceptional capabilities of constructing structures across multiple length scales for remarkable performances from limited choices of building blocks. However, simultaneous control over structures at both the macroscopic and microscopic length scales is restricted by the high requirements in the type and property of building blocks. Here, directed self-assembly of microdroplets in an evaporating liquid is harnessed to fabricate large-scale ordered films with precisely controlled microstructures. Evaporation-induced variations in liquid confinement allow microdroplets to reassemble for large-scale ordered patterns. Deformation of microdroplets into different shapes accurately defines multiple topographical structures at the microdroplet level. The fabrication process is facile and scalable, and works with various materials for manufacturing functional films with tunable properties. These results suggest a facile yet effective strategy for engineering microstructures by combining directed self-assembly with manipulation of the property of building components for both structural fidelity and diversity.
研究领域:
材料科学
·
纳米科技
·
软物质物理
·
表面科学
·
功能薄膜
✓ 已验证
DOI
MATERIALS LETTERS
·
2014
·
IF 2.269
Jianxiu Liu,Dafeng Zhang,Xipeng Pu,Daoyou Dong,Peiqing Cai,Hyo Jin Seo
Magnetically separable Zn 1− x Cd x S/γ-Fe 2 O 3 ( x =0–1) photocatalysts were synthesized by a one-step combustion method. The structures, morphologies, absorbance, optical and photocatalytic properties of the samples were studied by X-ray powder diffraction, scanning electron microscopy, transmission electron microscopy , ultraviolet–visible spectrophotometry and photoluminescence . The experimental results show that the formation of hexagonal Zn 1− x Cd x S and γ-Fe 2 O 3 and the combination of them were one-pot achieved. The Cd 2+ content has a significant influence on the absorbance of visible light and fluorescence properties. The magnetic properties of samples ensure the magnetic separation by using a magnet. CdS/γ-Fe 2 O 3 shows the best photocatalytic performance compared with other samples, ascribed to its small energy band gap and matching energy band structure between CdS and γ-Fe 2 O 3 . Moreover, no obvious deterioration was observed in the stability tests.
研究领域:
材料化学
·
光催化
·
纳米材料
·
环境功能材料
·
无机合成
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2019
·
IF 5.77
Tingting Cheng,Siqi Li,Lan Xu,Adnan Ahmed
A modified electrospinning (MES), which consists of a copper mesh collector and an air pump placed behind it, was presented to fabricate nanofiber membranes (NFMs) with controllable large pore sizes by adjusting the MES parameters, such as copper mesh size, air velocity, applied voltage, flow rate and collecting distance. The controllable preparation mechanism of NFMs with large pore sizes was systematically investigated by experimental research and theoretical analysis. And the effects of the copper mesh grid dimensions, air velocity, applied voltage, flow rate and collecting distance on the pore sizes of NFMs were demonstrated. The results showed that NFMs with large pores produced successfully by the MES, and the pore sizes were all micrometer scale. And the optimal average pore size reached 14.45 μm 2 at the grid size of copper mesh of 4 mm×4 mm, the air velocity of 5 m/s, the applied voltage of 12 kV, the flow rate of 1.0 mL/h and the collecting distance of 18 cm.
研究领域:
材料科学
·
生物医学工程
·
纳米技术
·
组织工程
·
过滤材料
✓ 已验证
DOI
高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2013
·Vol. 23
·期 6
·1492-1500
·
IF 1.174
Zhang Nan,Fan Yu-Hua,Bi Cai-Feng,Zhang Xia,Zhang Peng-Fei,Zhang Zhong-Yu,Li Xin
Three novel transition metal coordination polymers, [Ni(C 18 H 16 N 3 O 2 ) 2 ·2CH 3 OH]
n
( 1 ), [Zn(C 18 H 16 N 3 O 2 ) 2 ·4CH 3 OH]
n
( 2 ) and [Cd(C 18 H 16 N 3 O 2 ) 2 ·2CH 3 OH]
n
( 3 ) (C 18 H 16 N 3 O 2 =2-acetylpyridine- d -tryptophan) were synthesized and characterized by elemental analysis, IR, UV, 1 H NMR and X-ray diffraction single crystal analysis. The analyses of the structures indicate that all three materials crystallize in the tetragonal crystal system, space group P 4 1 2 1 2. They have similar structures; i.e., the Schiff base coordinates in its deprotonated form and behaves as a hexadentate (4N+2O) coordinated ligand to form a distorted octahedron geometry. On the other hand, as a result of the alternate arrangement of chains through N–H···O intermolecular hydrogen bonds interactions, 2-D layers are formed for the three complexes. Furthermore, the luminescent properties and thermal stabilities of the three complexes were investigated.
研究领域:
无机化学
·
配位化学
·
材料化学
·
晶体工程
·
光物理化学
✓ 已验证
DOI
高影响因子
CARBOHYDRATE POLYMERS
·
2018
·
IF 5.158
Lei Du,Amin GhavamiNejad,Zhi-Chao Yan,Chandra Sekhar Biswas,Florian J. Stadler
Here, we report on the effect of functional copolymer poly(N-isopropylacrylamide-co-4-vinyl-phenylboronic acid) (NIBA) on the rheology and network structure formed by sodium alginate (SA) through linear and nonlinear viscoelasticity measurements. The hydrogel moduli at pH 3 increased with increasing NIBA addition, while the yield point decreased. Furthermore, these hydrogels showed strain-softening behavior, weak G″-overshoot marking the onset of nonlinearity, and good self-healing properties after large deformation. The zero-strain nonlinearity parameter (Q 0 ) was found to be more sensitive to NIBA-addition than the linear viscoelastic properties. The blends showed a clear peak in the startup test except for SA alone and the peak intensity increased with increasing NIBA-concentration. Finally, based on all data, gelation mechanism and interaction of SA and NIBA will be clarified.
研究领域:
高分子材料科学
·
生物医学工程
·
软物质物理
·
药剂学
·
组织工程
✓ 已验证
DOI
高影响因子
Nano Energy
·
2014
·
IF 10.211
Xiaolei Jiang,Huayun Xu,Jing Liu,Jian Yang,Hongzhi Mao,Yitai Qian
Hierarchical mesoporous Li 2 Mn 0.5 Fe 0.5 SiO 4 consisted of nanoparticles or nanoplates has been successfully synthesized for the first time by a hydrothermal method . Their carbon-coated composites are obtained by a heat treatment in the presence of citric acid. These composites were characterized by powder X-ray diffractometry, scanning and transmission electron microscopy , Raman spectroscopy , and thermogravimetric analysis . The lithium storage capacity and cycling performance of the optimized Li 2 Mn 0.5 Fe 0.5 SiO 4 /C composite are greatly enhanced when tested as a cathode material in lithium-ion batteries (LIBs). It exhibits a discharge capacity of 125 mAh g −1 after 60 cycles at a rate of 0.1 C. This superior electrochemical property could be ascribed to high purity and mesoporous structure of Li 2 Mn 0.5 Fe 0.5 SiO 4 , which greatly enhances the electronic conductivity as well as the diffusion coefficient of lithium ions .
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
固体化学
✓ 已验证
DOI
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2018
·Vol. 303
·期 10
·1800339
·
IF 2.69
Zhandong Gu,Yichao Xu,Lie Chen,Ruochen Fang,Qinfeng Rong,Xu Jin,Lei Jiang,Mingjie Liu
Conductive hydrogels have attracted considerable attention due to their promising applications in a variety of fields. However, conductive hydrogels prepared by conventional strategies usually suffer from poor mechanical properties and low fatigue resistance. In this study, a synergistic strategy to fabricate macroporous conductive hydrogels (PC-hydrogels) by introducing macroporous structure to the hydrogels is reported. The polypyrrole can distribute uniformly in the hydrogel network, thus endowing the hydrogels with good electrical conductivity and outstanding fatigue resistance. Moreover, the combination of stiff polypyrrole and soft hydrogel network can enhance the mechanical properties of the hydrogel. As a result, the PC-hydrogels show negligible performance degradation after being compressed for more than 1200 cycles. Furthermore, the PC-hydrogels-based sensors can detect a variety of human motions with different intensities and ranges. The outstanding mechanical reliability and electrical conductivity make these PC-hydrogels suitable for application in areas of strain sensors and wearable devices.
研究领域:
生物材料
·
生物医学工程
·
柔性电子
·
纳米医学
·
组织工程
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2017
·
IF 3.133
Yanrong Wang,Hui Huang,Qingshui Xie,Yuanpeng Wang,Baihua Qu
Sodium-ion batteries (SIBs) have gained more and more interest for grid-level energy storage applications compared with current lithium-ion batteries (LIBs). In this paper, well-uniform and dispersed spindle-shaped NiCo 2 O 4 particles were synthesized by solvothermal method, and then graphene-encapsulated NiCo 2 O 4 (NiCo 2 O 4 @G) was formed core-shell nanostructures , which greatly enhanced the electronic and ionic (electro-active) conduction and also effectively buffering to accommodate the strain. Benefit from its structure feature, the prepared NiCo 2 O 4 @G core-shell nanostructures composite shows good cycling with a capacity of up to ∼400 mAh g −1 (100 mA g −1 ) in 100 cycles for NIBs anode. The facile synthesis process and excellent SIBs behaviors in this paper are expected to be extended in developing other anode materials in battery system.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米材料
·
电池技术
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ao Li,Binfang He,Guangchao Jin,Dongmei Liu,Jingbo Chen
Li-rich manganese-based cathode material is expected to be extremely promising for next-generation lithium-ion batteries due to its high specific capacity derived from additional anion redox behavior and low cost of the main element manganese. However, the irreversible release of lattice oxygen results in poor structural stability and inferior electrochemical performances , such as low initial Coulomb efficiency, irreversible capacity decay and serious voltage decay, which limits its commercialization. Herein, a simple strategy to improve the structural stability and electrochemical performances by one-step treatment with triethylamine (TEA) at moderate temperature is reported. TEA was used as a surface treatment reagent to prepare the modified Li-rich manganese-based cathode materials with oxygen vacancies and local structural distortion on the surface. The presence of surface distortion layer and oxygen vacancies inhibits irreversible oxygen release. The result exhibits that initial Coulomb efficiency, rate performance and initial discharge specific capacities are improved. After 100 cycles at a current density of 1 C, the specific capacity of the surface-treated material is 204.3 mAh g -1 (172.6 mAh g -1 for the pristine material), with a capacity retention of 81.26%. Even at a high current density of 10 C, the discharge specific capacity of 139.4 mAh g -1 is still achieved, demonstrating the excellent electrochemical performance. This study provides a simple and effective strategy for constructing special surface structures on Li-rich manganese-based materials to achieve high performance.
研究领域:
材料科学
·
电化学
·
能源存储
·
锂离子电池
·
固态化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2014
·Vol. 52
·期 17
·2442-2453
·
IF 3.245
Bingyan Jiang,Lei Zhang,Jie Yan,Qingquan Huang,Bing Liao,Hao Pang
A series of well-defined thermoresponsive graft polymers with different lengths and graft densities, poly(glycidyl methacrylate)- graft -poly( N -isopropylacrylate) (PGMA- g -PNIPAM), were successfully prepared by combination of controlled/living free radical polymerization and click chemistry. Effects of grafting length and density on the thermoresponsive behavior, aggregating mean diameter, and self-assembly morphology are systematically investigated. The thermosensitive characteristics of graft polymers in aqueous solution prove that the length and graft density had positive co-relationship with the lower critical solution temperature value and mean diameter of micelles as well as the size distribution, while the effect of graft length of polymers is more significant than that of density. Transmission electron microscopy analysis shows that the conformations of PGMA 45 - g -PNIPAM 20 and PGMA 45 - g -PNIPAM 46 with longer length and bigger grafting density in aqueous solutions are spherical nanoparticles with the increasing trend of the diameters, while that of PGMA 45 - g -PNIPAM (73, 50%) shows a spherical-like morphology, which indicates that the graft length and density have a significant effect on the mean diameter of micelle but not on the self-assembly morphology. These results reveal that to obtain desired thermoresponsive behavior and self-assembly morphology of functional polymers, it is essential to design and fabricate the structure of graft polymers with proper length and graft density. © 2014 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2014 , 52 , 2442–2453
研究领域:
高分子化学
·
材料科学
·
纳米医学
·
药物递送
·
生物材料
·
智能响应材料
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）