MICROSYSTEM TECHNOLOGIES-MICRO-AND NANOSYSTEMS-INFORMATION STORAGE AND PROCESSING SYSTEMS
·
2015
·Vol. 22
·期 4
·677-686
·
IF 0.875
Wang Lei,Liu Wenfang,Li Shuang,Liu Tingting,Yan Xingxing,Shi Yuye,Cheng Zeneng,Chen Chuanpin
Conventional ways to produce microfluidic devices cost a lot due to the requirements for cleanroom environments and expensive equipment, which prevents the wider applications of microfluidics in academia and in industry. In this paper, a dry film photoresist was utilized in a simple way to reduce the fabrication cost of microfluidic masters. Thus, a fast prototyping and fabrication of microstructures in polydimethylsiloxane microchips through a replica molding technology was achieved in a low-cost setting within 2.5 h. Subsequently, major manufacturing conditions were optimized to acquire well-resolved microfluidic molds, and the replicated microchips were validated to be of good performance. A T-junction channel microchip was fabricated by using a dry film master to generate water droplets of uniform target size. Meanwhile, a gated injection of fluorescein sodium and a contactless conductivity detection of Na + were both performed in a crosslink channel microchip via capillary electrophoresis, in other words, this fast prototyping and fabrication method would be an efficient, economical way to embody structural design into microfluidic chips for various applications.
✓ 已验证
DOI
高影响因子
PLANT AND SOIL
·
2015
·Vol. 390
·期 1
·337-349
·
IF 2.952
Fan Xianwei,Hu Haiyang,Huang Guiyuan,Huang Feiyan,Li Youzhi,Palta Jairo
Background and aims Plant-growth promoting rhizobacteria (PGPR) can promote plant performance under water deficit, but the physiology and biochemistry of the promoting process induced by PGPR under different water deficits is not well known in maize ( Zea mays L). Methods A glasshouse study was conducted to determine the effects of Burkholderia sp. LD-11 on morphophysiological traits for plant growth and homeostasis between reactive oxygen species (ROS) and antioxidant enzymes under five regimens in two maize inbred lines. Results Soil inoculation with Burkholderia sp. LD-11 promoted biomass accumulation and improved instantaneous water-use efficiency (WUEi), regardless of the soil water availability. It also triggered production of indole-3-acetic acid (IAA), decreasing the accumulation of abscisic acid (ABA) induced by the water deficit, alleviated ROS accumulation, and resulted in a reduction in lipid peroxidation induced by the water deficits. Soil inoculation also enhanced the tolerance to water deficit through reducing stomatal aperture by increasing the sensitivity of stomatal conductance ( g
s ) to small changes in ABA concentration in the leaves. Conclusions Soil inoculation with Burkholderia sp. LD-11 enhanced root systems and WUEi, offering a potential avenue for improving maize tolerance to water deficit.
✓ 已验证
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 2
·1-16
·
IF 23.2
Yuan Liying,Zhao Wenxin,Miao Yukun,Wang Chang,Cui Anguo,Tian Zhongning,Wang Ting,Meng Alan,Zhang Meng,Li Zhenjiang
The inadequate impedance matching and weak attenuation capability for incident electromagnetic waves exhibited by carbon fibers (CF) are critical factors limiting their application served as absorbing materials. Constructing a nanocomposite system that simultaneously exhibits both dielectric loss and magnetic loss characteristics is a feasible strategy to overcome these limitations. In the present study, a core-shell CF@PPy@CoFe 2 O 4 nanocomposite is fabricated through electrodeposition and subsequent hydrothermal methods to enhance the attenuation capacity and impedance matching of bare CF. Under the synergistic effects of diverse components and a peculiar network structure, the nanocomposite demonstrates optimized conductive loss and polarization loss, which results in a remarkable electromagnetic wave absorption performance with a minimum reflection loss (RL min ) of -55.33 dB and an effective absorption bandwidth (EAB) of 6.48 GHz (12 ~ 18 GHz) at optimal thicknesses of 2.11 and 2.42 mm, respectively, suggesting its promising application as a candidate absorber. More importantly, the exploration concerning the absorption mechanism provides significant insights into the attenuation modes of the dielectric-magnetic loss hetero-junction, which is beneficial for developing similar absorbing materials. Graphical abstract
CF@PPyCoFe 2 O 4 nanocomposite displays an efficient electromagnetic wave absorption capacity by virtue of its excellent conductive loss and polarization loss.
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Research
·
2017
·Vol. 11
·期 4
·515-521
·
IF 0.927
Fu Wei,Huang Kai,Cai Hong-Hong,Li Jian,Zhai De-Li,Dai Zhi-Cong,Du Dao-Lin
Heavy metal pollution of the soil has become a global threat to the terrestrial environment, food security, and human health due to their non-biodegradable and high persistent characteristics in the soil. However, the effective measurements for the restoration of these polluted soils are rare; therefore, this study was conducted to investigate the role of four naturalized plants ( Celosia argentea , Praxelis clematidea , Eupatorium adenophora , and Solidago canadensis ) as potential resources for the remediation of cadmium
contamination through a tolerance and accumulation experiment. The plants’ morphological phenotype (growth and biomass), physiological phenotype (relative chlorophyll content, leaf nitrogen content, root cell activity, and reactive oxygen species), and cadmium accumulation were evaluated using the hydroponic method. The results showed that cadmium induced an excess of reactive oxygen species in the roots, and the growth of C. argentea is depressed greatly. Praxelis clematidea , E. adenophora , and S. canadensis were identified to have a higher tolerance to cadmium accumulation and could be used as potential species for phytoremediation after further investigation of the actual remediation results in the field.
✓ 已验证
产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2017
·Vol. 24
·期 12
·11289-11298
·
IF 2.741
Pan Shuihong,Feng Chuchu,Lin Jialu,Cheng Lidong,Wang Chengjun,Zuo Yuegang
The spatial distribution and seasonal variations of methylmercury (MeHg) in Wen-Rui-Tang (WRT) River network were investigated by monitoring the MeHg concentrations in surface water samples collected from 30 sites across the river network over four seasons. Detection frequencies and concentrations of MeHg were generally higher in January, indicating that low sunlight irradiation, wind speed, and temperature conditions might enhance the persistence of MeHg in surface water. The MeHg levels varied with sampling locations, with the highest concentrations being observed in the industrial area especially around wastewater outfall, revealing that the mercury contamination in WRT River mainly comes from the industrial wastewater. Photodegradation of MeHg in WRT River surface water and the effects of natural constituents such as fulvic acid (FA), ferric ions (Fe 3+ ), nitrate (NO 3
− ), and dissolved oxygen on the MeHg photodegradation in aqueous solutions were studied under the simulated sunlight. The experimental data indicated that the indirect photodecomposition of MeHg occurred in WRT River surface water. Photodegradation of MeHg in FA solution was initiated by triplet 3 FA* or MeHg-FA* via electron transfer interaction under light irradiations. The Fe 3+ and NO 3
− can absorb light energy to produce ·OH and enhance the photochemical degradation of MeHg. The MeHg photodecompositions in FA, nitrate, and Fe 3+ solutions were markedly accelerated after removing the dissolved oxygen.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2016
·Vol. 25
·期 4
·1296-1303
·
IF 1.969
Zhang Qin,Shi Xu-Hua,Chen Han-Jia
Three kinds of degradable and blood-compatible polyurethane (PU) were synthesized by coupling hydroxyl-terminated poly(vinylpyrrolidone) (PVP) with diisocyanate-terminated PU. The chemical structure and molecular weight of the synthesized copolymer were systematically characterized by nuclear magnetic resonance spectrum ( 1 HNMR), Fourier transform infrared spectroscopy (FTIR) and gel permeation chromatography (GPC). The hydrophilicity and water absorption of the synthesized PU was increased by introducing PVP segment. To evaluate the hemocompatibility and degradability of the modified PU films, the extent of platelet adsorption, plasma recalcification time, hemolysis and degradation were measured. All results indicated that the blood compatibility and degradability of the PU films were improved significantly after introduction PVP segment into PU.
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 25
·7095-7103
·
IF 3.125
Yu Linpo,Liu Yang,Zhou Ming
Ruthenium(II) complexes with carboxylic acid as a bioconjugatable group, i.e., [Ru(bathophenanthroline disulfonate)(2,2′-bipyridine)(4-methyl-4′-(3-carboxypropyl)-2,2′-bipyridine)] 0 , (C 49 H 38 N 6 O 8 S 2 Ru), and [Ru(bathophenanthroline disulfonate) 2 (4-methyl-4′-(3-carboxypropyl)-2,2′-bipyridine)] 2− · 2Na + , (C 63 H 44 N 6 O 14 S 4 RuNa 2 ) were characterized spectroscopically and electrochemically. As potential labels for electrochemiluminescence (ECL) immunoassays, the ECL intensities of the free labels in homogenous aqueous buffer solutions were compared under a condition that is similar to the one employed by a commercial clinical immunoassay system. The two labels were found to be more emissive and, thus, can be detected at 10 - 12 pM compared with 5× 10 −12 pM of the label currently used in the commercial ECL system. Furthermore, the improved ECL emission of the free labels in homogenous solutions was proven to be translated into more intense ECL signal in heterogeneous sandwich immunoassay and, thus, leading to a lower limit of detection in immunoassay. The data obtained from these ECL labels shed light on the further development of ECL-based clinical immunoassay technology.
Electrochemiluminescence immunoassays were carried out with three different ruthenium(II) complex labels. It was proved that the higher signal intensities found with the novel labels in homogeneous solutions were maintained in heterogeneous sandwich format.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY
·
2016
·
IF 3.031
Fuxing Xu,Qiankun Dang,Xinhua Dai,Xiang Fang,Yuanyuan Wang,Li Ding,Chuan-Fan Ding
Collision induced dissociation (CID) is one of the most established techniques for tandem mass spectrometry analysis. The CID of mass selected ion could be realized by ion resonance excitation with a digital rectangular waveform. The method is simple, and highly efficient CID result could be obtained by optimizing the experimental parameters, such as digital waveform voltage, frequency, and q value. In this work, the relationship between ion trapping waveform voltage and frequency at preselected q value, the relationship between waveform frequency and the q value at certain ion trapping voltage for optimum CID efficiency were investigated. Experiment results showed that the max CID efficiency of precursor reserpine ions can be obtained at different trapping waveform voltage and frequency when q and β are different. Based on systematic experimental analysis, the optimum experimental conditions for high CID efficiency can be calculated at any selected β or q. By using digital ion trap technology, the CID process and efficient fragmentation of parent ions can be realized by simply changing the trapping waveform amplitude, frequency, and the β values in the digital ion trap mass spectrometry. The technology and method are simple. It has potential use in ion trap mass spectrometry.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHINESE JOURNAL OF POLYMER SCIENCE
·
2016
·Vol. 34
·期 11
·1373-1385
·
IF 1.811
An Min-fang,Xu Hao-jun,Lv You,Zhang Li,Gu Qun,Tian Feng,Wang Zong-bao
Ultra-high molecular weight polyethylene (UHMWPE)/chitin nanocrystal (CNC) fibers were prepared. Compared with the pure UHMWPE fibers, the ultimate tensile strength and Young’s modulus of UHMWPE/CNC fibers are improved by 15.7% and 49.6%, respectively, with the addition of chitin nanocrystals (CNCs) of 1 wt%. The melting temperature ( T
m ) of UHMWPE/CNC fibers was higher than that of pure UHMWPE fibers. Pure UHMWPE fibers and UHMWPE/CNC fibers were characterized with respect to crystallinity, orientation and kebab structure by wide-angle X-ray diffraction (WAXD), small-angle X-ray scattering (SAXS) and scanning electron microscopy (SEM). It is found that the CNCs act as the shish structure in UHMWPE/CNC fibers and the kebab crystals are grown around the CNCs. There was almost no difference between pure UHMWPE fibers and UHMWPE/CNC fibers in orientation. But the degree of crystallinity of various stages of UHMWPE/CNC fibers was respectively higher than the corresponding stage of pure UHMWPE fibers. Moreover, the addition of 1 wt% CNCs improved the thickness of kebab crystals and accelerated the transformation of kebab to shish.
✓ 已验证
产品关联
DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2016
·Vol. 294
·期 11
·1815-1821
·
IF 1.89
Ge Lingling,Li Xia,Friberg Stig E.,Guo Rong
Janus emulsions are prepared by one-step vibrational mixing of two immiscible oils, silicone oil, SO, with density of 0.964 g/cm 3 and sunflower oil saturated with dimethyl phthalate, VO (DMP), with density of 0.991 g/cm 3 , and an aqueous solution of sodium dodecyl sulfate as continuous phase. The destabilization of Janus emulsion is followed by the change of layer dimension as well as the microscope image, illustrating the two main aspects of creaming and coalescence. The fundamental impasse of the final separation of the Janus drop oils against unfavorable free energy change is resolved by a numerical analysis on a model emulsion with realistic interfacial tension values to show a thermodynamically favored path to the final destabilization process.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2016
·Vol. 18
·期 5
·1-9
·
IF 2.101
Liu Fenfen,He Juan,Zeng Mulang,Hao Juan,Guo Qiaohui,Song Yonghai,Wang Li
Abstract In this work, a facile strategy to synthesize Cu–hemin metal-organic frameworks (MOFs) with peroxidase-like activity was reported. The prepared Cu–hemin MOFs were characterized by various techniques such as scanning electron microscopy, transmission electron microscopy, X-ray powder diffraction, Fourier transform infrared spectroscopy, UV–visible absorbance spectra, and so on. The results showed that the prepared Cu–hemin MOFs looked like a ball-flower with an average diameter of 10 μm and provided a large specific surface area. The Cu–hemin MOFs possessing peroxidase-like activity could be used to catalyze the peroxidase substrate of 3,3,5,5-tetramethylbenzidine in the presence of H 2 O 2 , which was employed to detect H 2 O 2 quantitatively with the linear range from 1.0 μM to 1.0 mM and the detection limit was 0.42 μM. Furthermore, with the additional help of glucose oxidase, a sensitive and selective method to detect glucose was developed by using the Cu–hemin MOFs as catalyst and the linear range was from 10.0 μM to 3.0 mM and the detection limit was 6.9 μM. This work informs researchers of the advantages of MOFs for preparing biomimetic catalysts and extends the functionality of MOFs for biosensor application. Graphical Abstract
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2016
·Vol. 183
·期 6
·2047-2053
·
IF 4.831
Cui Malin,Zhao Yuan,Wang Chan,Song Qijun
Colloidal iridium nanoparticles (IrNPs) were synthesized through an environmentally friendly approach by using trisodium citrate as the capping molecule in an aqueous medium. The resulting colloidal IrNPs have a typical diameter of 2.5 nm and display absorption bands at 250, 400 and 600 nm. They possess uniform morphology, good dispersibility, excellent stability in water, and exhibit strong surface enhanced Raman scattering (SERS) activity with an enhancement factor (EF) of 3.5 × 10 5 at the 1512 cm‾ 1 peak when using Rhodamine 6G as the probe molecule. The excellent SERS performance of the IrNPs was exemplarily applied to the determination of the industrial colorant Sudan Red I. The peak intensity of the Raman band at 1236 cm‾ 1 is linearly related to the concentration of Sudan Red I which can be determined by SERS in the 2 nM to 8 μM concentration range with a limit of detection as low as 0.6 nM. In our perception, this strong SERS activity of the IrNPs has a large potential in the SERS-based quantitation of various chemical substances.
Iridium nanoparticles (IrNPs) were synthesized using trisodium citrate as the capping in aqueous medium in a single step. The dispersible and uniform IrNPs with strong surface enhanced Raman scattering activity were exemplarily applied to the determination of Sudan red I.
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）