Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-11
·
IF 3.159
Guo Chaozhong,Li Yanrong,Xu Ya,Xiang Qin,Sun Lingtao,Zhang Weizhong,Li Wensheng,Si Yujun,Luo Zhongli
Synthesis of metal-free carbon-based electrocatalysts for oxygen reduction reaction (ORR) to replace the conventional platinum-based catalysts has currently become a hot topic of research. This work proposes an activation-assisted carbonization strategy for the fabrication of nitrogen-doped nanoporous carbon microfibers (Me-CFZ-900) with a high BET surface area (~ 929.4 m 2 g −1 ) via using melamine as a promoter/nitrogen source and bamboo-carbon biowastes as the carbon source with the help of a zinc chloride activator. Electrochemical tests showed that the Me-CFZ-900 material has exhibited excellent ORR electrocatalytic activity and long-term stability, and also displayed a quasi-four-electron ORR pathway in alkaline electrolyte. We also find that the graphitic-N may be the catalytically active site for the ORR, but the formation of planar-N can further help to promote the ORR activity for our catalysts. The results open a new space and provide a new idea to prepare valuable porous nanocarbon materials on the basis of carbonaceous solid wastes for catalysis of a wide range of electrochemical reactions in the future.
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BULLETIN OF MATERIALS SCIENCE
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2019
·Vol. 42
·期 1
·1-5
·
IF 1.264
Zhou Wei,Xie Qian,Li Junjie,Zhengwei Cao,Peng Feng
A simple and economic \(\hbox {CO}_{{2}}\) bubbling crystallization reactor for preparation of strontium carbonate \((\hbox {SrCO}_{3})\) was designed. Through monitoring pH and conductivity, hollow \(\hbox {SrCO}_{{3}}\) fibres without any morphology control agents were successfully obtained. The effects of temperature and \(\hbox {CO}_{{2}}\) flow rate on the morphology of \(\hbox {SrCO}_{{3}}\) were analysed. This study presents a new method for carbonate crystal control and growth.
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Journal of Bionic Engineering
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2019
·Vol. 16
·期 1
·38-46
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IF 2.463
Zhang Xuemei,Fu Feng,Gao Xiaoming,Hou Xiufang
Magnetically driven super-hydrophobic materials were prepared by Fe 3 O 4 nanoparticles and stearic acid, which were deposited on the surface of polyurethane sponges. The presence of the Fe 3 O 4 nanoparticles makes the sponge have the magnetic, and the micro-nano hierarchical structure and hydrophobic functional groups lead to the sponge have excellent superhydrophobicity. The as-prepared sponge exhibited excellent absorption capacities for various oils and organic solvents ranging from 23.8 times to 86.7 times of its own weight. Moreover, the oil separation capacities still keep a high value after 50 cycles of squeezing the saturated absorbed as-prepared sponge. All of these satisfactory properties make the as-prepared sponge as a candidate of ideal absorbents for oily industrial wastewater and oil spills in oceans.
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Food Biophysics
·
2019
·Vol. 14
·期 2
·142-153
·
IF 2.411
Jiao Wenjuan,Li Lin,Fan Penghui,Zhao Di,Li Bing,Rong Hui,Zhang Xia
The effect of xanthan gum on the freeze-thaw stability of wheat gluten was evaluated during a 60-day storage period at −18 °C with thawing every 5 days for 4 h at 25 °C. The physicochemical and rheological properties of wheat gluten-xanthan gum mixtures with multiple scales were analyzed. In the control samples (wheat gluten without xanthan gum), the molecular weight by size-exclusion chromatography-multiple angle laser light scattering (SEC-MALLs), content of free SH groups measured by UV/VIS spectrophotometry, and the hole sizes in the wheat gluten network structure shown by SEM increased as the freeze-thaw storage time increased, while the surface hydrophobicity index (H 0 ) decreased. For the wheat gluten-xanthan gum mixtures, more disulfide bonds were preserved and numerous small pores in the wheat gluten structure were observed. Meanwhile, the sample with 0.225% xanthan gum (w/w) had the lowest content of free SH groups. The wheat gluten-xanthan gum mixtures had more α-helixes than the control samples with the same freeze-thaw storage time. Rheological analysis showed that the wheat gluten-xanthan gum mixtures had higher elasticity and viscosity than the control samples. Overall, the addition of xanthan gum improved the freeze-thaw stability of the wheat gluten network.
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MICROCHIMICA ACTA
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2019
·Vol. 186
·期 2
·1-9
·
IF 5.479
Liu Lirong,Zhu Gangbing,Zeng Wei,Yi Yinhui,Lv Baohe,Qian Junjuan,Zhang Depeng
Silicon quantum dots (SiQDs) were synthesized from N-[3-(trimethoxysilyl)propyl]-ethylenediamine and catechol by a hydrothermal method. Transmission electron microscopy, Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy were used to characterize the morphology and structure of quantum dots. The SiQDs were then placed on gold nanoparticles (AuNPs). When Cys is added to this solution, Cys will penetrate the SiQDs “shell” of the SiQDs/AuNP composite. This is due to the interaction and conformational differences of Cys and other substance with AuNPs and leads to the dispersion of the aggregated SiQD/AuNPs. A color change from purple to red can be visually observed, and the (green) fluorescence of SiQDs (with excitation/emission peaks at 430/520 nm) is restored. This dual-readout nanoprobe was successfully applied to the selective and sensitive detection of cysteine (Cys) in (spiked) serum and urine samples. The detection limit is 3.5 nmol·L −1 (at an S/N ratio of 3), and the method works on the 0.01 to 2 μM Cys concentration range.
Schematic illustration of a method for synthesizing silicon quantum dots (SiQDs) and coating them on gold nanoparticles (AuNPs) as an optical probe for colorimetric and fluorometric determination of cysteine.
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JOURNAL OF ELECTRONIC MATERIALS
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2019
·Vol. 48
·期 3
·1511-1521
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IF 1.676
Fan Libing,Ma Qianli,Tian Jiao,Li Dan,Xi Xue,Dong Xiangting,Yu Wensheng,Wang Jinxian,Liu Guixia
Here, we report a strategy for constructing {[Tb(BA) 3 phen + Eu(BA) 3 phen]/PAN}//[PANI/PAN] (BA = benzoic acid, phen = phenanthroline, PANI = polyaniline, PAN = polyacrylonitrile) hetero-structured microyarns simultaneously endowed with the bi-functionality of tunable luminescence colors and electrical conductivity by using a conjugate electrospinning technique. The obtained hetero-structured microyarns are composed of [Tb(BA) 3 phen + Eu(BA) 3 phen]/PAN luminescent nanofibers and PANI/PAN electrically conductive nanofibers, realizing efficient separation of dark-colored PANI from rare earth (RE) complexes, and thus the enhanced luminescent performance is obtained. Under 276-nm ultraviolet light excitation, the emitting light color of the hetero-structured microyarns can be adjusted in a broad range of green–yellow–red by changing the proportion of RE complexes. The electrical conductivity of the hetero-structured microyarns also can be modulated via tuning the percentages of PANI. These hetero-structured microyarns, by virtue of their luminescent properties and electrical performance, are expected to be applied in multifunctional applications.
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Journal of Food Measurement and Characterization
·
2019
·Vol. 13
·期 2
·1159-1165
·
IF 1.415
Musa Abubakr,Jiang Bo,Ma Haile,Gasmalla Mohammed A. A.,Abdalhai Mandour H.,Al-alfarga Ammar
In this work, alternansucrase enzyme from Leuconostoc citreum SK24.002 was used to produce di-glycosyl-stevioside through acceptor reaction. This was detected by high-performance liquid chromatography (HPLC) and was isolated using AB-8 macroporous resin and semi-preparative HPLC. With the help of mass spectroscopy, 1D NMR (H 1 and C 13 ) and 2D NMR (COSY, HMQC, HMBC) the di-glycosyl-stevioside structure was identified to be 13-{[α-D-glucopyranosyl-(1→3)-α-D-glucopyranosyl-(1→6)-β-D glucopyranosyl-(1→2)-β-D-glucopyranosyl]oxy} kaur-16-en-19-oic acid β-D glucopyranosyl eater. In order to increase the modified stevioside (di-glycosyl-stevioside) product and reduce production time, the impact of velocity of shaking on the di-glycosyl-stevioside production was also evaluated, using 75–150 rpm for 24 h at 25 °C. The results showed that the di-glycosyl-stevioside production increased significantly (p < 0.05) from 0.35 ± 0.0.01 mg/mL for 75 rpm to 1.0667 ± 0.0152 mg/mL for 150 rpm at 6 h during the glycosylation reaction.
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MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 2
·1-8
·
IF 5.479
Li Zhentao,Mao Zhenkun,Chen Zilin
This work reports on the in-situ growth of a metal organic framework (MOF) composed of zinc(II), adeninate and biphenyldicarboxylate on the inner wall of a capillary, and the use of this MOF as a stationary phases in open-tubular capillary electrochromatography. The inner wall of a fused-silica capillary was first modified with 3-aminopropyltriethoxysilane to create surface amino sites, and then the MOF was synthesized by in-situ growth. The modified capillary was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. The results proved the successful growth of the MOF. The resultant open-tubular column showed good separation selectivity towards neutral compounds, acidic and basic compounds including nonsteroidal anti-inflammatory drugs, sulfa drugs and small biomolecules. In addition, the modified column is stable and repeatable. The precisions (expressed as RSDs) of the retention time for intra-day ( n = 5) and inter-day (n = 5) separations and between columns ( n = 3) are less than 0.5, 1.6 and 4.7%, respectively. Conceivably, this new kind of MOF represents a most useful novel stationary phase in electrochromatographic separations.
Schematic presentation of the open-tubular column modified with bio-MOF-1 by in situ hydrothermal reaction with adeninate, Zn(II) and biphenyldicarboxylate for capillary electrochromatographic separations.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 11
·8613-8626
·
IF 3.442
Wang Danfeng,Liang Na,Kawashima Yoshiaki,Cui Fude,Yan Pengfei,Sun Shaoping
This study proposed a novel injectable nanocarrier for paclitaxel (PTX) based on biotin-modified bovine serum albumin (BSA). First, the biotin-modified BSA (biotin-BSA) was successfully synthesized and characterized by FT-IR analysis. Then, the PTX-loaded biotin-BSA nanoparticles (NPs) were prepared by disulfide bond reducing method and stabilized through the formation of intermolecular disulfide bonds. The influence of solution pH, glutathione concentration, temperature and organic solvent on the formation of NPs was studied. Under the optimized conditions, the PTX-loaded NPs had a mean diameter of 163 nm with zeta potential of − 35 mV. Transmission electron microscopy analysis showed that the NPs were sphere in shape and had a narrow size distribution. XRD and DSC spectra confirmed the successful encapsulation of PTX in the NPs in an amorphous state. The MTT assay verified that the in vitro cytotoxicity of PTX-loaded biotin-BSA NPs to biotin receptor-positive MCF-7 cells was a little higher than that of Taxol ® . The cellular uptake experiments by flow cytometry demonstrated the biotin receptor-mediated endocytosis of biotin-BSA NPs. It can be concluded that the PTX-loaded biotin-BSA NPs were a promising drug delivery carrier for PTX.
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IONICS
·
2018
·Vol. 25
·期 2
·727-735
·
IF 2.347
Feng Aihu,Yu Yang,Mi Le,Yu Yun,Song Lixin
In this work, the MXene Ti 3 C 2 with excellent electrical conductivity is obtained by etching Ti 3 AlC 2 with NH 4 HF 2 solution. The electrosorption performance, the electrochemical and physicochemical properties of as-prepared Ti 3 C 2 are characterized. The results demonstrate that NH 4 HF 2 -etched Ti 3 C 2 possesses the better intercalation pseudo-capacity and the specific capacitance is up to 78 F∙g −1 , which is an increase of 34% than HF-etched Ti 3 C 2 . In addition, the desalination capacity of NH 4 HF 2 -etched Ti 3 C 2 enhances 35.5% than that of HF-etched Ti 3 C 2 . When the initial conductivity of NaCl is ~ 1000 μS/cm, the desalination capacity of NH 4 HF 2 -etched Ti 2 C 3 electrode is 12.1 mg∙g −1 , and the pseudo-first-order model can well describe the electrosorption kinetics of NH 4 HF 2 -etched Ti 3 C 2 electrode. Furthermore, the regeneration performance of the NH 4 HF 2 -etched Ti 3 C 2 electrode is excellent. This study indicates a new kind of effective electrode material to improve the desalination performance of capacitive deionization (CDI) technology.
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Nanoscale Research Letters
·
2018
·Vol. 13
·期 1
·1-8
·
IF 3.125
Lu Junlin,Shang Chaoqun,Meng Qingguo,Lv Haiqin,Chen Zhihong,Liao Hua,Li Ming,Zhang Yongguang,Jin Mingliang,Yuan Mingzhe,Wang Xin,Zhou Guofu
A series of novel visible light driven all-solid-state Z-scheme BiOBr 0.3 I 0.7 /Ag/AgI photocatalysts were synthesized by facile in situ precipitation and photo-reduction methods. Under visible light irradiation, the BiOBr 0.3 I 0.7 /Ag/AgI samples exhibited enhanced photocatalytic activity compared to BiOBr 0.3 I 0.7 and AgI in the degradation of methyl orange (MO). The optimal ratio of added elemental Ag was 15%, which degraded 89% of MO within 20 min. The enhanced photocatalytic activity of BiOBr 0.3 I 0.7 /Ag/AgI can be ascribed to the efficient separation of photo-generated electron–hole pairs through a Z-scheme charge-carrier migration pathway, in which Ag nanoparticles act as electron mediators. The mechanism study indicated that ·O 2 − and h + are active radicals for photocatalytic degradation and that a small amount of ·OH also participates in the photocatalytic degradation process.
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MICROCHIMICA ACTA
·
2018
·Vol. 185
·期 12
·1-10
·
IF 5.705
Wang Meng-Meng,Chen Shuai,Zhang Dan-Dan,Yu Yong-Liang,Wang Jian-Hua
A sorbent for selective extraction of phosphoproteins was obtained by immobilization of a Ce(IV)-substituted polyoxometalate on ethylenediamine-functionalized graphene oxide (CeEGO). The resulting composites exhibit an adsorption capacity of 981 mg g −1 for β-casein due to the synergistic effect of metal-affinity interaction between Ce(IV) and phosphate groups and π-stacking interaction between the polyoxometalate framework and the phosphate groups. The results of LC-MS and SDS-PAGE analysis show that the CeEGO composites can be applied to the extraction of phosphoproteins from protein mixture, and as little as 50 μg mL −1 of the phosphoprotein β-casein can be detected by SDS-PAGE. It was also applied to the extraction of β-casein from spiked biological samples such as drinking milk, whole blood and swine heart tissue extract.
An efficient sorbent is obtained by immobilization of a Ce(IV)-substituted polyoxometalate on ethylenediamine-functionalized graphene oxide (CeEGO). The resulting composites exhibit highly selective capture capacity towards phosphoproteins due to the synergistic effect of metal-affinity interaction between Ce(IV) and phosphate groups and π-stacking interaction between the polyoxometalate framework and the phosphate groups.
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