CELLULOSE
·
2013
·Vol. 21
·期 1
·519-528
·
IF 3.476
Liu Kai,Lin Xinxing,Chen Lihui,Huang Liulian,Cao Shilin
In order to enhance the antibacterial and mechanical properties of agar films, the chitosan-methylisothiazolinone (C–MIT) complex was first prepared by the ionic gelation method, and the characterization of the C–MIT complex was carried out by Fourier transform infrared spectroscopy, transmission electron microscopy, and Thermo gravimetry. Chitosan was successfully crosslinked with tripolyphosphate for the nanoencapsulation of methylisothiazolinone, and the C–MIT complex was spherical in shape with a diameter of about 10 nm. The C–MIT/MFC biocomposites obtained through the adsorption of the C–MIT complex on the microfibrillated cellulose (MFC) was then incorporated into the agar films. In comparison with the pure agar films, the tensile strength of the agar composite films was increased by about 19 % at the loading of 10 wt% of C–MIT/MFC biocomposites, and antibacterial tests demonstrated that the agar composite films exhibited remarkable antibacterial activities against both Escherichia coli and Staphylococcus aureus . This work provides a new approach to utilizing multifunctional agar films in the medical field.
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高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2013
·Vol. 31
·期 3
·399-406
·
IF 1.27
Tan Ye-qiang,Song Yi-hu,Zheng Qiang
Colloidal suspensions of glutaraldehyde (GA) crosslinked or grafted graphene oxide (GO) sheets were fabricated by simply tailoring the feed sequence. The different structures were confirmed by Fourier transform infrared spectra and X-ray diffraction. As demonstration of the utilities, the different colloidal suspensions were used to prepare free-standing papers by flow-directed filtration and poly(vinyl alcohol) (PVA)-based nanocomposite films by casting. Free-standing papers from GA crosslinked GO sheets exhibited better mechanical properties than unmodified GO paper, while nanocomposite films from GA grafted GO exhibit higher tensile strength and Young’s modulus.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2012
·Vol. 19
·期 9
·1-7
·
IF 1.733
Yang Hong Yu,Zhang Xiu Mei,Duan Li Jie,Zhang Ming Yao,Gao Guang Hui,Zhang Hui Xuan
A series of fluorescent multiblock PEG-polyurethane copolymers with free carboxyl groups were synthesized by one-step method and their chemical structure and properties were investigated. The multiblock PEG-polyurethane copolymers were composed of poly(ethylene glycol) (PEG), 1,6-hexamethylene diisocyanate, 2,2-bis(hydroxymethyl) propionic acid and a fluorescent dye erythrosine B (EB). The resulting polymers were examined by 1 HNMR, FT-IR, gel permeation chromatography (GPC), ultraviolet visible spectroscopy (UV–vis), fluorescent spectroscopy. As a result, the UV–vis spectra showed that EB can be successfully conjugated into PEG-polyurethane during the one-step reaction. And the UV absorption peaks of samples were blue-shift and strengthened with decreasing of pH values, indicating that PEG-polyurethane-EB can be a pH-dependent fluorescent probe in a broad pH range. We expect that more applications would be possible for the fluorescent PEG-polyurethane with free carboxyl groups owing to its free functional groups and simultaneously imaging along with pH values.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 8
·1-7
·
IF 2.175
Cui Hongtao,Zhao Yunan,Ren Wanzhong,Liu Yan,Wang Minmin
First aqueous non-silica foams, solely stabilized by CoOOH nanoparticles, were prepared by a new colloidal strategy. Highly water-soluble CoOOH nanoparticles with size of 1.5 nm were produced from the reaction between Co(OH) 2 nanosheets and ammonia. The foams were formed through the hand-shaking of the high-concentration colloid formed by the redisolving of CoOOH nanoparticles in water. The stability of the foams was attributed to the reduction of surface tension induced by the hydrophilic CoOOH particles and the support of particulate network in the void between bubbles. These two factors also provided resistance for the bubble collapse during the evaporation of solvent, resulting in the keeping of the original foam morphology after drying and the formation of a hierarchically hollow structure of CoOOH. Herein, we proved that the highly hydrophilic nanoparticles also can stabilize liquid foams. This conclusion is different from the classic theory on foams, which may provide new insight for foams and also a pathway for the preparation of inorganic hollow structure.
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高影响因子
Journal of Superconductivity and Novel Magnetism
·
2023
·Vol. 36
·期 3
·965-974
·
IF 1.8
Liu Chaocheng,Hu Jiyu,Xu Haifeng
The modulation of ions substitution has been regarded as a promising route to induce magnetic transition and tailor intrinsic properties for spinel ferrites as expected. Herein, Fe-substituted Co(Ga 2- x Fe x )O 4 spinel ferrites have been successfully prepared by a solid-state method. It is shown that the lattice constant increases gradually with the rising amount of Fe substitution due to a larger ionic radius of Fe than that of Ga. More importantly, a significant improvement in magnetic properties has been achieved under the effort of Fe substitution, especially in intrinsic coercivity ( H c ). Correspondingly, the saturation magnetization ( M s ), H c , and Curie temperature ( T C ) increase from 11.01 emu/g, 0.29 kOe, and 10 K to 86.05 emu/g, 11.45 kOe, and 318 K respectively based on Fe substitution. Our work realizes a marked modulation of magnetic properties in Co(Ga 2- x Fe x )O 4 , providing a fundamental strategy for magnetism tuning as well as the development of magnetic devices.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2013
·Vol. 15
·期 3
·1-9
·
IF 2.175
Pang Shuting,Zhou Zhan,Wang Qianming
A new class of terbium hybrids within the silica framework has been synthesized using modified silylated derivatives of aromatic acids. These organic–inorganic materials have very homogenous spherical shapes (diameter around 60 nm) and exhibit characteristic green emissions in DMSO/H 2 O (1:1). Significantly, they present highly selective and rapid (1–2 s) emission quenching effects with respect to tryptophan compared to other essential amino acids for human. In addition, enhanced thermal stabilities can be achieved in these hybrid materials.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2019
·Vol. 23
·期 10
·2969-2977
·
IF 2.531
Ma Mei,Zhang Jiali,Shen Wenzhuo,Guo Shouwu
Transition metal oxides (TMOs), such as Fe 3 O 4 , Co 3 O 4 , and NiO, assume large lithium ion storage capacities, but suffer severe structure pulverization and rapid electrochemical performance fading during lithiation/delithiation cycling. In the work, the transition metal oxide particles are cladded and bridged with graphene oxide (GO) sheets forming GO/TMO composites with unique three-dimensional network structure. As anode for lithium ion battery, the as-assembled GO/TMO composites show superior reversible specific capacity, rate capability, and cycling stability over the corresponding bare TMOs. It is illustrated that the GO sheets tightly clad on the TMO particle surfaces can suppress the volume variation, prevent the structure pulverization of the particles, and promote the formation of stable solid electrolyte interphase film during the lithiation/delithiation processes, which afford consequently the GO/TMO composites with decent cycling stability and fast lithium ion diffusion rate and decent electrochemical kinetic properties. Therefore, it can be envisaged that to clad and bridge properly with GO sheets should be generally useful for improving the structure stability and the electrochemical performances of the anode materials undergoing the chemical reactive lithium ion storage mechanisms. In addition, the simple synthesis method and low production cost are beneficial to its practical application.
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2015
·Vol. 19
·期 6
·1827-1831
·
IF 2.446
Hou Junke,Song Jie,Niu Yubin,Cheng Chuanjun,He Hong,Li Yutao,Xu Maowen
P2-type Na 0.67 Ni 0.33 Ti 0.67 O 2 is explored as a titanium-based anode material for sodium ion batteries. The as-prepared Na 0.67 Ni 0.33 Ti 0.67 O 2 delivers a reversible capacity of 129.2 mAh g −1 at 0.05 C with smooth charge–discharge curves. A simple carbon-coating technique was used to improve the electronic conductivity of Na 0.67 Ni 0.33 Ti 0.67 O 2 particles. The carbon-coated Na 0.67 Ni 0.33 Ti 0.67 O 2 delivers a higher reversible capacity of 163.7 mAh g −1 and exhibits better rate capability than the as-prepared Na 0.67 Ni 0.33 Ti 0.67 O 2 .
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高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2019
·Vol. 23
·期 10
·2785-2792
·
IF 2.531
Shao Dingsheng,Wang Xianyou,Li Xiaolong,Luo Kaili,Yang Li,Liu Lei,Liu Hong
The performance of solid-state lithium ion battery mainly depends on the performance of the electrolyte and the interface between the electrolyte and the electrodes. Improving the interface contact between the electrolyte and the electrodes is vital for development of solid-state battery. In this work, the gel polymer electrolytes are prepared by thermal initiation and used as quasi-solid-state electrolytes in the LiFePO 4 /Li battery. In order to enhance the interface properties between the electrolyte and the electrodes, we adopt in situ polymerization strategy to form electrolyte in the inner of the battery. The scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and electrochemical impedance spectroscopy (EIS) are used to characterize the physico-chemical and electrochemical performance of gel polymer electrolytes. The final results show that the strategy of in situ polymerization of electrolyte in the inner of the battery can significantly improve the contact between the electrodes and electrolyte. The as-prepared quasi-solid-state battery shows lower interface resistance and significantly improved cycle performance. Therefore, the strategy of in situ polymerization of electrolyte in the inner of the battery provides a useful idea for solving the interface problem of quasi-solid-state batteries.
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高影响因子
IRANIAN POLYMER JOURNAL
·
2018
·Vol. 28
·期 1
·39-49
·
IF 1.278
Yang Zhouxiaoshuang,Zou Hu,Liu Hui,Xu Wenshuang,Zhang Lulu
To compare the synthesis and drug release of random and block copolymers, random and block copolymerizations of oligo(ethylene glycol)methyl ether methacrylate (OEGMA) and 1′-(2-methacryloxyethyl)-3′,3′-dimethyl-6-nitrospiro-(2H-1-benzopyran-2,2′-indoline) (SPMA) were carried out by atom transfer radical polymerization. The 1 H NMR and GPC results indicated the targeted random and block copolymers were successfully synthesized. Critical micelle concentrations of random and block copolymers were determined as 0.0178 mg/mL and 0.0265 mg/mL, and the micelle aggregation numbers of the random and block copolymers were calculated as approximately 17 and 13, respectively, indicating that more molecular chains were required to form a stable polymeric micelle for a random than its block copolymer. A lower critical solution temperature of 37 °C, the human body temperature, was obtained for two copolymer samples, suggesting that they might have potential application in the biomedical field. During the self-assembly, the morphology of block copolymer micelles was more regular than that of random copolymer, and both copolymers exhibited the exchange of hydrophilic and hydrophobic segments called as “Schizophrenic” behavior under UV light irradiation at 50 °C. With doxorubicin as a model molecule in drug release control, heating and ultraviolet light irradiation could accelerate the drug release process to some extent, indicating the potential application of the resulting random and block copolymers in drug release and bioengineering.
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2015
·Vol. 74
·期 2
·528-536
·
IF 1.532
He Mengyao,Chen Ruoyu
CuMnCoO x thin films for solar thermal absorber applications were prepared by a citric acid-based sol–gel dip coating method. The citric acid (CA) and polyethylene glycol 200 (PEG 200) were selected as a complexing agent and an esterifying agent respectively. The influence of different preparation conditions, i.e. (Cu + Mn + Co)/CA molar ratios and PEG/CA molar ratios, on film structure and optical properties were studied. Texture properties (crystallinity, grain size, surface topography) were obtained by using X-ray diffraction, field emission scanning electron microscopy and atomic force microscopy. Adhesion strength and thermal stability of the films were also tested. Absorption study indicated that pure spinel phase with a particle size of ~18 nm was a decisive factor in improving the intrinsic solar-absorbing capacity. Meanwhile, the generation of the uneven pores (pore size ~300 nm) on the film surface further lengthened the absorb path in UV–Vis spectrum. The single films displaying the best reflectance spectra and the highest solar absorptance (α > 0.93) were deposited from solutions containing molar ratio (Cu + Mn + Co)/CA/PEG = 1, which were much higher than that reported in the literature (88 %). The study showed that the intrinsic absorbing ability of the transition-metal oxide absorbers could be expanded by using a citric acid-based sol–gel route. Graphical
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高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2017
·Vol. 46
·期 10
·5877-5883
·
IF 1.579
Wang Yan,Han Jing,Guo Fu,Ke Xiaoxing
Grain orientations are a significant factor under high-density current stressing, but there are few literature reports about the influence of grain orientation on electromigration in composite solder joints. Most research relating to the electromigration behavior of composite solders have been carried out by adding different kinds of reinforced particles in order to relieve the electromigration phenomena, while the impacts of grain orientation on the electromigration have been neglected. In this paper, Sn-3.5Ag composite solder joints reinforced by 2 vol.% Cu were fabricated to investigate the effects of Sn grain orientation on electromigration. The one-dimensional single-grained solder joints were stressed under a constant current density of 10 4 A/cm 2 for different times at room temperature. The samples, of which the c -axis of the Sn grains was nearly parallel to the electron flow direction, exhibited serious electromigration-induced phenomena after current stressing for 528 h. However, electromigration was not observed in the samples where the Sn grains had their c -axis perpendicular to the electron flow direction. Therefore, the grain orientations have a great influence on the electromigration behavior in composite solders and Cu atoms moved faster along the c -axis of the Sn grains than along the a - and b -axes during current stressing.
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高影响因子
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