ANALYTICAL AND BIOANALYTICAL CHEMISTRY
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2019
·Vol. 411
·期 6
·1159-1167
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IF 3.286
Ju Yan Jun,Li Na,Liu Shi Gang,Liang Jia Yu,Gao Xin,Fan Yu Zhu,Luo Hong Qun,Li Nian Bing
The Red-emitting nitrogen-doped carbon dots (N-CDs) are synthesized using o-phenylenediamine by a one-step method, and can serve as a fluorescent probe for “turn off” detection of hematin in human red cells. The red-emitting N-CDs can be obtained only in acidic conditions and the emission of the red-emitting N-CDs is pH-dependent, indicating proton-controlled synthesis and emission. The red-emitting N-CDs are 2.7 nm in mean size and have a uniform dispersion and exhibit a high quantum yield (12.8%) and great optical properties. The developed sensing system for hematin displays a linear response from 0.4 to 32 μM with a detection limit of 0.18 μM. Importantly, this fluorescent probe demonstrates a good potential practicability for the quantitative detection of hematin in complex matrixes.
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PubMed
高影响因子
IONICS
·
2019
·Vol. 25
·期 9
·4109-4118
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IF 2.289
You Run,Han Xiang,Zhang Ziqi,Li Lianchuan,Li Cheng,Huang Wei,Wang Jianyuan,Xu Jianfang,Chen Songyan
Silicon is a promising anode material for the next generation of lithium-ion batteries. Binder plays an essential role in maintaining electrode integrity when Si undergoes dramatic volume change during lithiation/delithiation processes. Herein, an environmental friendly water-soluble binder of oxidized starch cross-linked sodium carboxymethyl cellulose (OS-CMC) possessing three-dimensional (3D) network structure is designed. The abundant hydroxyl and carboxyl groups and the 3D structure of the cross-linked binder not only enhance the bonding with Si nanoparticles surface but also greatly alleviate the mechanical stress, thus maintaining the integrity of electrode and conductive network. In addition, it can facilitate faster lithium-ion transportation at the interface of Si/OS-CMC. As a result, the Si anodes with OS-CMC binder show good electrochemical stability and better mechanical properties than that of Si anodes with OS or CMC binder. The Si anodes with OS-CMC binder exhibit a discharge capacity of 1922 mAh g −1 after 100 cycles at a current density of 0.4 A g −1 with a high initial discharge capacity of 3424 mAh g −1 and maintain a superior capacity of 1667 mAh g −1 at a high current density of 8 A g −1 . Our work provides a novel binder design for high-performance Si-based anodes.
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高影响因子
Nano Research
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2019
·Vol. 12
·期 5
·1173-1179
·
IF 8.515
Xu Yanchao,Cui Xiaoqiang,Wei Shuting,Zhang Qinghua,Gu Lin,Meng Fanqi,Fan Jinchang,Zheng Weitao
The development of highly efficient Pt-based alloy nanocatalysts is important but remains challenging for fuel cells commercialization. Here, a new class of zigzag-like platinum-zinc (Pt-Zn) alloy nanowires (NWs) with rough surface and controllable composition is reported. The merits of anisotropic one-dimensional nanostructure, stable high-index facets and coordinatively unsaturated Pt sites endow the composition-optimal Pt 94 Zn 6 NWs with a mass activity of 7.2 and 6.2 times higher than that of commercial Pt black catalysts toward methanol/ethanol oxidation, respectively. Alloying-induced d -band electron modulation and lattice strain effects weaken the adsorption strength of poisoning species, which originally enhances the catalytic activity of Pt-Zn NWs. This study provides a new perspective of Pt-Zn electrocatalysts with intrinsic mechanism for enhanced catalytic performance.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 5
·5109-5119
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IF 2.195
Xu Xiaoyang,Liu Qianqian,Wei Ting,Zhao Ying,Zhang Xiangjing
The NiMoO 4 sheets were grown on graphitic carbon nitride (g-C 3 N 4 ) using a very simple chemical precipitation method. The prepared g-C 3 N 4 /NiMoO 4 can be used as the electrode material of supercapacitors and exhibit a high specific capacitance of 1275 F g −1 at 0.25 A g −1 owing to the interconnected structure and presence of N by the incorporation of g-C 3 N 4 . In addition, the g-C 3 N 4 /NiMoO 4 //rGO hybrid supercapacitor was assembled by employing g-C 3 N 4 /NiMoO 4 and rGO as positive and negative electrode respectively. The assembled hybrid device can exhibit good electrochemical performances, such as the specific capacitance of 146 F g −1 , energy density of 90 Wh kg −1 and accepted cycle stability with 70% capacitance retention after 4000 continuous cycles. These results powerfully demonstrate that the prepared g-C 3 N 4 /NiMoO 4 can be applied as a potential candidate in the electrode material of supercapacitors.
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高影响因子
CELLULOSE
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2019
·Vol. 26
·期 5
·3183-3192
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IF 3.917
Pan Ying,Liu Longxiang,Song Lei,Hu Yuan,Jiang Shudong,Zhao Hongting
Abstract Cellulose nanofibers (CNFs) were modified with 2 bilayers coating composed of polyethlenimine (PEI), melamine and phytic acid using a layer-by-layer self-assembly technique. The (PEI + melamine/phytic acid) 2 based coating was successfully deposited on the surface of modified cellulose nanofibers (MCNFs). Herein, the CNF referred to the carbon source and the phytic acid was chosen as the acid source. Polyethylenimine and melamine served as the blowing agents. Then the CNF and MCNF were introduced to the polyvinyl alcohol (PVA) matrix to investigate the thermal decomposition, flammability, light transmittance and mechanical properties of the PVA/CNF and PVA/MCNF composites. The thermal decomposition of PVA-MCNF-6 (with 6 wt% MCNF) was retarded compared with that of pure PVA. Meanwhile, the addition of 6 wt% MCNF obviously reduced the peak heat release rate of PVA, as evidenced by the 37% reduction. The PVA/CNF and PVA/MCNF composites exhibited similar light transmittance compared with the pure PVA film. Moreover, the addition of CNFs in the PVA matrix resulted in higher tensile strength and elongation at break than those of the PVA matrix. Graphical abstract
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高影响因子
FOOD SCIENCE AND BIOTECHNOLOGY
·
2019
·Vol. 28
·期 4
·1235-1240
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IF 0.888
Kwon Yeji,Yu Seungmin,Choi Gwang Su,Kim Jang Hwan,Baik Mooyeol,Su Seung Tae,Kim Wooki
The roots of Rehmannia glutinosa (RG) have been widely used for medicinal purposes in Asia. The traditional processing of RG involves repetitive steaming and drying, and 9-time-steamed RG (NSRG) is the most commonly consumed form. For a development of a convenient processing method, RG was puffed at various pressures resulting in significantly increased solid extraction yield by up to 14%. The amount of the Maillard reaction product 5-hydroxymethylfurfural and the antioxidant capacities determined by the ABTS and DPPH radical scavenging assays were enhanced at increasing puffing pressure. Treatment of lipopolysaccharide-stimulated RAW 264.7 macrophages with RG extracts revealed that puffing of RG enhanced its suppression of the pro-inflammatory cytokine IL-6 by up to 37%. The 5-hydroxymethylfurfural contents, ABTS/DPPH radical scavenging capacities, and IL-6 regulatory effects of puffed RG samples were greater than those of the NSRG control, indicating that puffing is a desirable processing technique for development of nutraceuticals using RG.
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PubMed
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2019
·Vol. 23
·期 8
·2579-2588
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IF 2.531
Du Fangkai,Zhang Hui,Tan Xuecai,Ai Chenhao,Li Mengru,Yan Jun,Liu Min,Wu Yeyu,Feng Defen,Liu Shaogang,Han Heyou
A sensitive electrochemiluminescence (ECL) aptasensor based on 3D graphene is described for thrombin detection utilizing nitrogen-doped graphene quantum dots doped silica (NGQDs@SiO 2 ) nanocomposite labeling as an enhancer. Ru(bpy) 3 2+ -Pt nanoparticles (Ru-PtNPs) with an ECL signal were dropped onto a 3D graphene-modified electrode, and then, a complementary thrombin aptamer (cDNA) was conjugated to the Ru-PtNPs. Finally, NGQDs@SiO 2 , coupled with the thrombin aptamer as the booster, was attached to the electrode surface by using hybridization with the cDNA, and the ECL intensity was efficiently enhanced. The target thrombin induced the NGQDs@SiO 2 nanocomposites labeled with the thrombin (TB) aptamer to be extracted because of their strong binding with thrombin. The immobilization amount of NGQDs@SiO 2 on the modified electrode decreased. Thus, the presence of thrombin could result in a decrease in the ECL signal. On the basis of the signal amplification factors, the fabricated ECL aptasensor demonstrated excellent properties with concentrations varying from 2.0 pM to 50 nM and a detection limit of 23.1 fM.
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高影响因子
POLYMER BULLETIN
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2019
·Vol. 77
·期 6
·2855-2871
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IF 1.858
Zhang Yongjie,Fan Mingshuai,Li Xiaopei
Abstract Long-chain alkyl silicone is a type of modified silicones that finds potential applications in various areas. Long-chain alkyl fluorosilicone (LCAFS) can be considered as a modified long-chain alkyl silicone as it synergistically combines the properties of long-chain alkyl silicone and novel fluorosilicone. As far as we know, reports on the synthesis of LCAFS are rare. In this report, a facile method to synthesize LCAFS was explored. It was found that silicone bearing novel C30-45 alkyls and trifluoropropyl pendent groups, namely (C30-45 alkyl) methylsiloxane/trifluoropropylmethylsiloxane copolymer (TF-AMS), could be synthesized via a simple siloxane equilibration process between silanol-terminated polytrifluoropropylmethylsiloxane and (C30-45 alkyl)methyl silicone, a commercially available silicone that is generally considered as unreactive. The chemical structure of TF-AMS was characterized unambiguously by FTIR, NMR, GPC and DSC. The thermal stabilities of TF-AMS were investigated by TGA. Based on our experimental results, a plausible mechanism for the synthesis of TF-AMS was proposed. Graphic abstract A novel long-chain alkyl fluorosilicone was synthesized via a simple yet efficient siloxane equilibration process.
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高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 11
·6653-6667
·
IF 3.917
Chen Yiming,Zhou Lijie,Chen Lian,Duan Gaigai,Mei Changtong,Huang Chaobo,Han Jingquan,Jiang Shaohua
Abstract Directional freeze-drying is considered to regulate the structure of nanocellulose aerogels with special performances. In this work, TEMPO-oxidized cellulose nanofiber aerogels with high porosity (> 99.5%) and low density (~ 7 mg/cm 3 ) were produced by different freeze-drying methods. The effects of temperature, freezing reagents and freezing methods on the structure and properties of aerogels were investigated. Among them, an anisotropic cellulose aerogel was obtained using a simple and flexible directional freezing in ethanol of − 30 °C by a self-made directional freezer. Our results demonstrated that it could present honeycomb-like pores in the transverse direction and regular directional tunnels in the longitudinal direction, and some attractive features, such as high water adsorption (120 g/g) and stability in water. Compared with other aerogels, this anisotropic structure also provided the aerogel with excellent compressive property (15.2 kPa) and faster liquid transport (4.95 mm/s) in the longitudinal direction than in other directions. The distinctive aerogels based on nanocellulose by directional freeze-drying are also expected to be combined with multifunctional materials to achieve directional applications to meet the requirements of different fields. Graphic abstract
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
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2019
·Vol. 91
·期 1
·44-53
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IF 1.986
Cai Huafei,Jiang Yonggang,Li Liangjun,Feng Junzong,Feng Jian
Abstract Monodispersed silica sol with a small particle size, narrow size distribution, and high conversion was prepared via a modified Stöber method, and an orthogonal test method was used to investigate the influence of TEOS concentration, R (H 2 O/TEOS), ammonia concentration, and reaction temperature on the particle size, size distribution, and conversion of silica sol. It was found that the remarkable factors affecting the particle size from a large to a small order were ammonia concentration, reaction, temperature, and R (H 2 O/TEOS) value; similarly, the remarkable factors affecting the silica sol conversion from a large to a small order were the R (H 2 O/TEOS) value and reaction temperature in decreasing order of influence. None of the factors investigated in this study exhibited a significant effect on the particle size distribution. The optimal synthesis conditions for the preparation of monodispersed silica sol with small particle size and high conversion were as follows: TEOS concentration = 0.4 mol/L; R (H 2 O/TEOS) = 60; ammonia concentration = 0.10 mol/L; reaction temperature = 75 °C. The average particle size of monodispersed silica sol under optimum conditions was 5.25 ± 0.77 nm, and the conversion was 94.05%. Besides, this study also provides a systematic experimental and theoretical basis for the preparation of different particle sizes monodispersed silica sol with high conversion.
Monodispersed silica sol with small particle size, narrow size distribution and high conversion was prepared via a modified Stöber method, and orthogonal test method was used to investigate the influence of TEOS concentration, R (H 2 O/TEOS), ammonia concentration and reaction temperature on the particle size, size distribution and conversion of silica sol. Under the optimum conditions, the monodispersed silica sol with 5.27 ± 0.82 nm average particle size and 94.05% conversion rate was obtained.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 13
·9983-9994
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IF 3.442
Yang Meng,Wang Linlin,Cheng Yongbin,Ma Ke,Wei Xinran,Jia Pengxiang,Gong Yongkuan,Zhang Yang,Yang Jingfa,Zhao Jiang
A self-healing hydrogel was synthesized via the multi-component reaction of azobenzene-methacrylamide, β-CD and 3-methacrylamido phenylboronic acid. The orthogonal method was applied to analyze the influence of host–guest inclusion complexation, cross-linker and phenylboronic acid monomers content on mechanical properties and healing efficiency of the hydrogel. The results indicated that hydrogel showed autonomic self-healing behavior. The hydrogel demonstrated light-switchable self-healing ability and pH-sensitive swelling ratio. It was found that hydrogel showed high elongation, excellent resilience and low elastic hysteresis. The design of the combined host–guest interactions and boronate esters on the hydrogel showed advantage for improving the mechanical, self-healing and recovery properties simultaneously.
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高影响因子
Journal of Food Measurement and Characterization
·
2019
·Vol. 13
·期 3
·1820-1830
·
IF 1.415
Harlina Putri Widyanti,Shahzad Raheel,Ma Meihu,Wang Ning,Qiu Ning
In the present study, we investigated the effect of galangal extract on the lipid oxidation, antioxidant activity and fatty acid composition of salted duck eggs. Three groups of salted duck eggs were comparatively assessed: salted duck egg enriched with 0.1% and 0.5% (w/v) of galangal extract and salted duck egg without galangal extract as a control. Results showed that galangal extract significantly reduced 2-thiobarbituric acid reactive substances from 1.60 mg MDA kg −1 to 1.07 mg MDA kg −1 and anisidine values from 67.55 to 53.64 at the end of salting time, moreover, decrease in the levels of conjugated dienes were also noticed from 0.018 to 0.007% during the salting time compared to the control group. Furthermore, galangal extract along with salting time also had significant effects on the fatty acid composition. Oleic acid, followed by palmitic acid and margaric acid, were the predominant fatty acids found in salted duck eggs supplemented with galangal extract after 14 days of salting process. Results of DPPH-scavenging activity indicated that salted duck eggs supplemented with 0.5% (w/v) galangal extract had significantly higher antioxidant activity ( p < 0.05) than control at 28th day of salting. Further, analysis of electronic nose revealed that the addition of galangal extract could provide unique flavor to salted eggs during the curing process.
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高影响因子
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