JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 29
·期 1
·244-250
·
IF 2.019
Du Liting,Li Yu,Li Shouchun,Li Haiying,Liu Li,Cheng Yali,Duan Haojie
The hierarchical porous and nonporous SnO 2 microflowers was successfully synthesized by a simple hydrothermal method and followed by calcination procedure. The microstructure and morphology of the product were characterized by X-ray diffraction, energy dispersive X-ray spectroscopy, and scanning electron microscopy (SEM). The SEM images display that the prepared SnO 2 is a microflower composed of countless thin sheets, and each of the sheets covered in a series of porous by calcining at 500 °C. Nevertheless, there is no porous when it treated at 400 °C. The results of comparison show that the hierarchical porous SnO 2 microflowers (HPSM) sensors possess a preferable gas-sensing property. The response of HPSM sensors to 100 ppm ethanol is 205.6 at the optimum operating temperature 240 °C. Which sensitivity is almost 3.9 higher than the hierarchical nonporous SnO 2 microflowers (HNSM) (52.9). Meanwhile, the response and recovery times of HPSM (HNSM) are 3 s (3 s) and 45 s (145 s) to 100 ppm ethanol, respectively. What’s more, the minimum concentration of ethanol that we can detect is 0.1 (1.0) ppm, and the response value is 1.9 (2.0). At last, both HPSM and HNSM own a good selectivity.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 5
·3332-3340
·
IF 2.599
Ding Dong,Zhou Bo,Fu Wuyou,Lv Pin,Yao Huizhen,Liu Li,Wang Jun,Yang Haibin
Herein, we report an ionic cross-linkage process of synthesizing [001] preferred oriented anatase TiO 2 nanowires and nanotubes hybrid structure (TWTs) based on anodization method wherein varied amounts of TiF 6
2− ions are added in synthetic process. We show how the TiF 6
2− ions switch the growth direction of TWTs from [101] to [001] (denoted as T 101 WTs and T 001 WTs, respectively) and change their geometrical morphologies, i.e., small ionic radii TiF 6
2− ions migrate and partly replace the TiO 6
2− octahedra under electric field, which separate out and leave vacancies during annealing process, resulting in a reconstruction of TiO 2 . Importantly, absorption property and photoelectrochemical (PEC) performance of T 001 WTs exceed those of T 101 WTs. Furthermore, CdS QDs are assembled onto TWTs photoelectrodes by successive ionic layer adsorption and reaction technique. Likewise, T 001 WT/CdS presents superior absorption capability and enhanced PEC performance to those of T 101 WT/CdS. This could be attributed to their preponderances of improved light absorption capability and decreased electron recombination.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2017
·Vol. 22
·期 2
·581-590
·
IF 2.316
Liu Yi,Ma Xiaoyan,Sun Kun,Yang Kaiqi,Chen Fang
As a kind of organic–inorganic hybrid materials with nanocage structure, polyhedral oligomeric silsesquioxane (POSS) has the advantages of good interaction with polymer and excellent thermal and mechanical stability. Star-shaped polyhedral POSS-poly(methyl methacrylate) (POSS-(PMMA
n
) 8 ) with different molecular weights had been synthesized by sequential atom transfer radical polymerization (ATRP) with POSS-(C 3 H 6 Cl) 8 as the initiator. Electrospun polyvinylidene fluoride (PVDF) composite gel polymer electrolytes (GPEs) modified by POSS-(PMMA
n
) 8 were prepared, and their electrochemical and mechanical properties were assessed. The POSS-(PMMA
n
) 8 particles were found to improve thermal stability and mechanical strength of the GPEs without decreasing electrochemical properties. Among all composite GPEs studied, the best comprehensive performance was obtained from PVDF-[POSS-(PMMA 46 ) 8 ] GPE: the porosity was 60.0%, and the tensile strength and the elongation at break were 4.94 MPa and 52.2%, respectively. Besides, the ionic conductivity was 4.85 × 10 −3 S cm −1 at room temperature, the electrochemical window could reach 6.0 V, and the interfacial impedance with Li electrode was 256.15 Ω. The cells with POSS-(PMMA) 8 -modified composite electrolytes also have good cycle performance. These results suggest that the PVDF-[POSS-(PMMA) 8 ] composite GPEs are suitable for lithium-ion battery applications.
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JOURNAL OF SOLUTION CHEMISTRY
·
2017
·Vol. 46
·期 12
·2281-2292
·
IF 1.342
Liu Bijun,Tian Yin,Yu Qianhong,Li Qiang,Mu Wanjun,Tan Zhaoyi,Wu Fengchang,Wang Dongqi,Li Xingliang
O-Phospho- l -serine is one of the naturally occurring phosphorylated amino acids, having important pharmacological activity and bioactivity. The protonation constants of O-phospho- l -serine were determined by means of potentiometric titrations at 25 °C and ionic strength of 0.5 mol·L −1 (NaCl). The heat effects of the protonation reaction of the O-phospho- l -serine were measured by direct calorimetry. NMR spectroscopy has demonstrated that the first protonation site occurs at the nitrogen atom in the amino group, followed by one of the oxygen atoms in the phosphono group, and finally the carboxyl oxygen atom. This trend is in good agreement with the enthalpy of protonation and quantum chemical calculations. These data will help to predict the speciation of O-phospho- l -serine in physiological systems.
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Nano-Micro Letters
·
2017
·Vol. 10
·期 1
·1-10
·
IF 4.849
Li Jingwei,Xu Weiming,Luo Jiaxian,Zhou Dan,Zhang Dawei,Wei Licheng,Xu Peiman,Yuan Dingsheng
The exploration of low-cost and efficient bifunctional electrocatalysts for oxygen evolution reaction and hydrogen evolution reaction through tuning the chemical composition is strongly required for sustainable resources. Herein, we developed a bimetallic cobalt–manganese sulfide supported on Ni foam (CMS/Ni) via a solvothermal method. It has discovered that after combining with the pure Co 9 S 8 and MnS, the morphologies of CMS/Ni have modulated. The obtained three-dimensionally hexagram-like CMS/Ni nanosheets have a significant increase in electrochemical active surface area and charge transport ability. More than that, the synergetic effect of Co and Mn has also presented in this composite. Benefiting from these, the CMS/Ni electrode shows great performance toward hydrogen evolution reaction and oxygen evolution reaction in basic medium, comparing favorably to that of the pure Co 9 S 8 /Ni and MnS/Ni. More importantly, this versatile CMS/Ni can catalyze the water splitting in a two-electrode system at a potential of 1.47 V, and this electrolyzer can be efficiently driven by a 1.50 V commercial dry battery.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2017
·Vol. 28
·期 23
·17772-17777
·
IF 2.019
Li Jiajia,Han Xiuxun,Zhao Yun,Li Jian,Wang Min,Dong Chen,Hao Zhaomin
A novel Cu 3 BiS 3 nanorods film was prepared by a facile dip-coating method and its compositional, structural and optoelectronic properties were systematically characterized. A possible reaction mechanism of Cu 3 BiS 3 was also discussed briefly. Optical absorption investigation revealed that Cu 3 BiS 3 nanorods film has a direct band gap of 1.46 eV. Photoelectrochemistry of hydrazine free unannealed film displays a strong p-type photoresponse, as high as ∼1.0 × 10 −4 A/cm −2 at an applied potential of −0.5 V versus Ag/AgCl under the visible light irradiation. The photocurrent response measurement on the Cu 3 BiS 3 nanorods film sheds light on the potential application as a low-cost, high-reproducibility and high-yield nanorods preparing approach towards efficient Cu 3 BiS 3 photoelectricity and photovoltaic materials.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 35
·期 12
·1463-1473
·
IF 1.692
Yang Zhen,Li Ning,Yang Xiao-xue,Zhang Xiao-a,Jiang Sheng-ling,Lyu Ya-fei
o -Carborane-containing poly(hydroxy ethers) ( P1 , P2 and P3 ) were synthesized via “advancement reaction” of o -carborane-containing bisphenol ( 4 ) and diglycidyl ether of bisphenols (DGEBA and 1 ). FTIR and 1 H-, 13 C-, and 11 B-NMR were utilized to characterize the obtained polymers. TGA test was conducted under nitrogen and air. It is found that the shielding effect of carborane moiety on its adjacent aromatic structures contributes to high initial decomposition temperatures, while oxygen in air has an adverse effect on the initial decomposition temperature. The oxygen can combine with polymer chain to form peroxide and hydroperoxide groups, which are more reactive during the degradation process. Besides, o -carborane-containing poly(hydroxy ethers) have high char yield at elevated temperatures. The boron atom combines with oxygen from the polymer structure or/and from air, thus to form a three-dimensional network linked with B—O—B and B—C bonds, and retain the polymer weight to a large extent.
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Frontiers of Materials Science
·
2017
·Vol. 11
·期 3
·223-232
·
IF 1.471
Wei Lulu,Lu Beibei,Li Lei,Wu Jianning,Liu Zhiyong,Guo Xuhong
A novel β-cyclodextrin-poly(2-(2-methoxyethoxy)ethyl methacrylate)- co -poly(ethylene glycol) methacrylate (abbreviated as: β-CD-(P(MEO 2 MA- co -PEGMA)) 21 ) was prepared by using the one-step strategy, and then the star-shaped copolymers were used in the atom transfer radical polymerization (ATRP). The structure of star-shaped β-CD-(P(MEO 2 MA- co -PEGMA)) 21 copolymers were studied by FTIR, 1 H NMR and gel permeation chromatography (GPC). The star-shaped copolymers could self-assembled into micelles in aqueous solution owing to the outer amphiphilic β-CD as a core and the hydrophilic P(MEO 2 MA- co -PEGMA) segments as a shell. These thermo-responsive starshaped copolymers micelles exhibited lower critical solution temperature (LCST) in water, which could be finely tuned by changing the feed ratio of MEO 2 MA to PEGMA. The LCST of star-shaped β-CD-(P(MEO 2 MA- co -PEGMA)) 21 copolymer micelles were increased from 35°C to 58°C with the increasing content of PEGMA. The results were investigated by DLS and TEM. When the temperature was higher than corresponding LCSTs, the micelles started to associate and form spherical nanoparticles. Therefore, β-CD-(P(MEO 2 MA- co -PEGMA)) 21 star-shaped copolymer micelles could be potentially applied in nano-carrier, nano-reactor, smart materials and biomedical fields.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2017
·Vol. 123
·期 9
·1-9
·
IF 1.455
Leng Yumin,He Junbao,Li Bo,Xing Xiaojing,Guo Yongming,Ye Liqun,Lu Zhiwen
The different sized and shaped Au NPs have intrigued considerable attention, because they possess different surface plasma resonance (SPR) absorption bands and thus result in many colorimetric Au NP-based detection applications. In this article, four different sized and shaped Au NPs of nanodots/rods were prepared and characterized. The as-prepared Au NPs were modified by the negatively charged anions of [SCH 2 CO 2 ] 2− to investigate both the size and shape effects of modified Au NPs on colorimetric detection of Co 2+ and the corresponding SPR absorption properties. The different-shaped Au NPs possess different SPR absorption properties. The Au nanorods appeared to be colorimetric sensitive for Co 2+ sensing.
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MICROCHIMICA ACTA
·
2017
·Vol. 184
·期 11
·4359-4365
·
IF 4.58
Zhou Yunlei,Li Bingchen,Wang Minghui,Wang Jun,Yin Huanshun,Ai Shiyun
The authors describe a fluorometric assay for microRNA. It is based on two-step amplification involving (a) strand displacement replication and (b) rolling circle amplification. The strand displacement amplification system is making use of template DNA (containing a sequence that is complementary to microRNA-21) and nicking enzyme sites. After hybridization, the microRNA strand becomes extended by DNA polymerase chain reaction and then cleaved by the nicking enzyme. The DNA thus produced acts as a primer in rolling circle amplification. Then, the DNA probe SYBR Green II is added to bind to ssDNA to generate a fluorescent signal which increases with increasing concentration of microRNA. The method has a wide detection range that covers the10 f. to 0.1 nM microRNA concentration range and has a detection limit as low as 1.0 fM. The method was successfully applied to the determination of microRNA-21 in the serum of healthy and breast cancer patients.
Schematic of a fluorometric microRNA assay based on two-step amplification involving strand displacement replication and rolling circle amplification. DNA probe SYBR Green II is then bound to ssDNA to generate a fluorescent signal which increases with increasing concentration of microRNA.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-8
·
IF 4.259
Su Yanbin,Ma Xiaowei,Su Yanwen,Mu Tongxing,Li Yanhe,Jiang Ning,Su Yuyun,Zhang Qi
Inappropriate use of ethanol (EtOH) had led to noticeable health problems, but a beneficial phenomenon was found that EtOH displayed unique influences for toxic trans-crotonaldehyde (TCA) derived from mitochondrial lipid peroxidation. The influences of EtOH on the structure of TCA were systematically probed by UV-vis & Raman spectroscopy in the absence and presence of mitochondria, respectively. The maximum UV-vis peak at 301 nm of TCA was red shifted by hydroxyl (-OH) and methyl (-CH 3 ) of EtOH, respectively. Raman stretching band of aldehyde (-CH=O) of TCA (TCA-CH=O) was split by the -CH 3 of EtOH. The -CH 3 increased TCA-CH=O stretching frequency while the -OH induced it. The more exposed -OH, the less stretching frequency. The ectopic -CH 3 red shifted the UV-vis peak at 301 nm and Raman band of TCA-CH=O. In mitochondria, EtOH red shifted Raman stretching band of TCA-CH=O. Raman stretching bands of C-H, C-O and C-C of EtOH were red shifted, while Raman stretching bands of -CH 2 and C-C-O of EtOH disappeared. The paper unearths the influences of EtOH to trap and transform the structure of TCA-CH=O. This discovery has an important contribution to eliminate TCA in order to protect and repair mtDNA by means of the decrease of 8-oxoG.
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高影响因子
International Journal of Peptide Research and Therapeutics
·
2017
·Vol. 25
·期 1
·161-168
·
IF 0.904
Yu Zhiliang,Zhang Ling,Qin Wangrong,Yin Jianhua,Qiu Juanping
Polymyxin E (colistin) has been considered as an important peptide antibiotic for clinical treatment of Gram-negative pathogens by selectively targeting lipopolysaccharide on the outer membrane. Recent reports showed that colistin can also kill Gram-positive bacteria, but the mechanism of colistin against Gram-positive bacteria remains unclear. In this study, we found that colistin can kill its producer Paenibacillus polymyxa , a Gram-positive bacterium, by both disrupting its cell integrity and inducing oxidative stress. Enhancement of the cell permeability is the major action of colistin against P. polymyxa . In relative, colistin-induced oxidative stress plays an associated role in killing of P. polymyxa . Notably, we, for the first time, found that exogenous catalase is able to intensify the colistin-induced killing by inhibiting the intracellular catalase activity and thus increasing oxidative stress. Our findings would shed light on a not yet clearly described bactericidal mechanism of colistin against Gram-positive bacteria. More importantly, our findings pave the road for the future to lower clinical use of colistin for avoiding bacterial resistance.
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