JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2015
·Vol. 26
·期 8
·5937-5945
·
IF 1.569
Zhang Dongzhi,Yin Nailiang,Xia Bokai
In this paper, we synthetized a hybrid composite of zinc oxide (ZnO) nanocrystalline-decorated reduced graphene oxide (rGO) via a facile hydrothermal process, and fabricated a methane gas sensor by using the ZnO–rGO hybrid composite as sensing film coated on a ceramic tube with Ni–Cr heater. The presence of nanorod-shaped ZnO nanocrystalline and rGO nanosheets was characterized by scanning electron microscopy, X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy, UV–Vis diffuse reflectance and photoluminescence spectra measurement. The sensing properties of the ZnO–rGO film sensor were investigated by exposing to various concentration of methane gas at different temperature. It was found that the presented sensor exhibited unique advantages in methane gas sensing with concentration spanning from 100 to 4000 ppm, such as outstanding repeatability, fast response-recovery time as well as good selectivity, at an optimal operating temperature of 190 °C. The gas response of the ZnO–rGO hybrid composite was superior to that of the pure ZnO and rGO counterpart in methane gas sensing. The possible and proposed sensing mechanism for the sensor is mainly attributed to its nano-hybrid structure and special interactions at p–n heterojunction. This observed results highlight the ZnO–rGO hybrid composite as a candidate material for constructing methane gas sensors.
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ANALYTICAL LETTERS
·
2014
·
IF 1.019
Hualing Zhu,Shumin Cui,Weiping Wang,Jigen Miao,Jiuju Feng,Jianrong Chen
A simple and rapid efficient method was developed for the determination of phthalate esters using dispersive liquid–liquid microextraction followed by gas chromatography with flame ionization detection. A mixture of isopropanol (0.75 mL, dispersant) and carbon tetrachloride (30 µL, extractant) with sodium chloride (1%, w/v) was used for extraction. Under optimum conditions, the method provided linear calibration curves between 0.5 and 200 µg L−1 for dibutyl phthalate, and 1.0 and 200 µg L−1 for butyl benzyl phthalate, diethyl phthalate, and diisooctyl phthalate. The relative standard deviations for intra-day and inter-day analyses were less than 5.8% and 6.9%, respectively, with enrichment factors between 229 and 424. Two wine samples were analyzed with recoveries between 70.1% and 119.3%.
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AICHE JOURNAL
·
2015
·Vol. 61
·期 6
·2028-2034
·
IF 2.748
Kaihong Chen,Wenjun Lin,Xini Yu,Xiaoyan Luo,Fang Ding,Xi He,Haoran Li,Congmin Wang
Five kinds of anion-functionalized ionic liquids (ILs) with different basicity and substituent were selected, prepared and applied in the capture of SO 2 from flue gas, where the concentration of SO 2 is only 2000 ppm. The effect of the anion on SO 2 absorption capacity, desorption residue, and available absorption capacity under 2000 ppm was investigated. The relationship between available absorption capacity and absorption enthalpy was also studied. Through a combination of thermodynamic analysis and quantum calculation, the results indicated that the effect of the cation in the IL on absorption enthalpy was significant. However, the effect of chain length in the cation was weak. Hence, a new IL with low molecular weight, [P 4442 ][Tetz], was further designed and applied for the capture of SO 2 , which shows the high absorption capacity of 0.18 g SO 2 per g IL and excellent reversibility for 2000 ppm SO 2 . © 2015 American Institute of Chemical Engineers AIChE J , 61: 2028–2034, 2015
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FUEL
·
2017
·
IF 4.601
Wenbo Zhao,Qian Zhao,Zheng Zhang,Jiaju Liu,Rui Chen,Yuan Chen,Jian Chen
Acidic gas capture by traditional aqueous amine solution requires a plenty of energy for solvent regeneration. A phase-change capture system was considered to be a promising alternative because only the CO 2 -rich phase needs to be recovered and the CO 2 -lean phase can be reused directly without disposal, improving the energy utilization efficiency. Based on this principle, the phase-change absorption behavior of linear polyamines including ethylenediamine (EDA), diethylenetriamine (DETA), triethylenetetramine, tetraethylenepentamine, and cyclic diamines including piperazine (PZ) and triethylene diamine (DABCO) in organic solvents was investigated in the present work. The result indicated that polyamines could react with CO 2 to form carbamate precipitates except DABCO, which had no absorption effect. For the absorption of SO 2 , polyamines could react with SO 2 and water from air to form rare organic sulfites except DABCO, which merely absorbed two SO 2 molecules to form the electron transfer complex DABCO·(SO 2 ) 2 . The peculiar absorption behavior of DABCO for CO 2 and SO 2 implied that it is a highly selective phase-change desulfurizer for flue gas. The sequence of decomposition temperature for the CO 2 capture product was DETA-carbamate > EDA-carbamate > PZ-carbamate, while for the SO 2 capture product was [EDAH 2 ][SO 3 ] > [PZH 2 ][SO 3 ]·H 2 O > DABCO·(SO 2 ) 2 .
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
·
IF 2.567
Yuyao Huang,Dahuan Liu,Ziping Liu,Chongli Zhong
In this work, ZIF-9 membranes were successfully synthesized using temperature-switching synthesis method. Compared with the conventional hydrothermal synthesis at a constant temperature, this method could promote the growth of crystals on the support. Scanning electron microscopy (SEM) demonstrated that the obtained membranes had continuous and well-intergrown layer with a denser surface and better crystal size uniformity. As a result, gas separation performance was enhanced. It is also found that the properties of membrane can remain almost stable at a relatively broad range of operating temperature and transmembrane pressure drop, which is beneficial for the practical operation of membrane in the separation process. More importantly, this synthesis strategy can be conveniently extended to the preparation of other MOF membranes with improved performance.
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JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Jianlin Peng,Yonggang Shi,Zhishuai Yang,Meiling Qi,Feng Wang
Dicyanuric-functionalized polycaprolactone (DPCL) was explored for its separation performance in gas chromatography (GC). The statically coated DPCL capillary column (0.25 mm, i.d.) showed column efficiency of 3460 plates/m determined by naphthalene at 120 °C. McReynolds constants and Abrahaḿs system constants were also determined to evaluate the polarity and possible molecular interactions of the stationary phase. As a result, DPCL column exhibited excellent separation performance for diverse types of analytes with good peak shapes. Most interestingly, it shows unique amphiphilic selectivity and high-resolution capability for both apolar to polar isomers. In addition, DPCL column had good column repeatability with the RSD values below 0.06% for run-to-run, 0.09–0.40% for day-to-day and 1.7–3.6% for column-to-column, and good thermal stability up to 280 °C. The high selectivity and resolving capability demonstrate the great advantages of the DPCL stationary phase for simultaneous determination of analytes of great variety in complex samples.
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PubMed
高影响因子
JOURNAL OF CHROMATOGRAPHY A
·
2016
·
IF 3.926
Wei-Qi Xie,Xin-Sheng Chai
This work reports on a novel method for the determination of isocyanate groups in the related organic intermediates by a reaction-based headspace gas chromatography. The method is based on measuring the CO 2 formed from the reaction between the isocyanate groups in the organic intermediates and water in a closed headspace sample vial at 45 °C for 20 min. The results showed that the method has a good precision and accuracy, in which the relative standard deviation in the repeatability measurement was 5.26%, and the relative differences between the data obtained by the HS-GC method and the reference back-titration method were within 9.42%. The present method is simple and efficient and is particularly suitable to be used for determining the isocyanate groups in the batch sample analysis.
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高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Shidong Dai,Nana Prempeh,Dagang Liu,Yimin Fan,Mingyue Gu,Yu Chang
With the increasing demand of environmental monitoring for toxic and odorous ammonia gas it is desired to develop specific green, cost-effective and in situ passive colorimetric alternatives to current complex instrumentations. In this work, we designed an ammonia gas sensor based on cholesteric liquid crystal films of copper(II)-doped cellulose nanocrystals (CNC Cu(II)) whose structure, optical and sensing properties were investigated. The hybrid films using the low doping Cu(II) as a color-tuning agent inherited the chiral nematic signature and optical activity of CNCs, suggesting a strong chelation between copper ions and negatively charged CNCs. The sensing performance illustrates that the CNC Cu(II)125 film was sensitive to ammonia gas which could merge into nematic layers of CNCs and trigger-sensed to copper ions chelated on CNCs, consequently arousing a red-shift of reflective wavelength as well as an effective colorimetric transition. Such a hybrid film is anticipated to boost a new gas sensing regime for fast and effective on-site qualitative investigations.
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PubMed
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Nano Research
·
2017
·Vol. 11
·期 1
·511-519
·
IF 7.354
Gao Zhiyi,Lou Zheng,Chen Shuai,Li La,Jiang Kai,Fu Zuoling,Han Wei,Shen Guozhen
Wearable gas sensors that are lightweight, portable, and inexpensive have great potential application in the real-time detection of human health and environmental monitoring. In this work, we fabricated flexible fiber gas sensors with single-walled carbon nanotube (SWCNT), multi-walled carbon nanotube (MWCNT), and ZnO quantum dot-decorated SWCNT (SWCNTs@ZnO) sensing elements. These flexible fiber gas sensors could be operated at room temperature to detect target gases with good sensitivity and recovery time. They also exhibited superior long-term stability, as well as good device mechanical bending ability and robustness. Integrating these flexible gas sensors into face masks, the fabricated wearable smart face masks could be used to selectively detect C 2 H 5 OH, HCHO, and NH 3 by reading the corresponding LEDs with different colors. Such face masks have great potential application in the Internet of Things and wearable electronics.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2017
·
IF 3.133
Tianming Li,Mou He,Wen Zeng
Previously, the formation of polyhedral Cu 2 O crystal is usually proposed like that the seed crystals grow outward following the relative growth rates (R values) along different directions ( Inside-out Pattern ) or that the surrounding building blocks aggregate toward the center followed by ripening ( Outside-in Pattern ). However, in this study, simply mixing aqueous Cu(CH 3 COO) 2 , NaOH, and D-(+)-glucose in the order listed at 70 °C for a period, a distinct growth manner of Cu 2 O polyhedron was observed based on carefully recording the solution color changes and the elaborate time-dependent SEM/TEM observations, which was referred to All-direction Pattern . More specifically, the initially formed Cu 2 O nanoshuttles first self-aggregated into porous braided structure with well-defined cubic framework and then condensed into solid cube from all direction via consuming the surrounding fragments everywhere possible, rather than in gradient densification from inside-out or outside-in. After that, the solid cube fell into the common Outside-in Pattern , i.e., adsorbing the surroundings followed by ripening. Although many complex polyhedral submicrostructures have been already reported, to our best knowledge, Cu 2 O crystal that grows in such manner is barely observed. It is believed that such interesting growth mechanism of polyhedral crystals could be general. What's more, the 30 min-Cu 2 O powder was made into a gas sensor towards ethanol, the performance of which has reached the level of application.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2016
·Vol. 32
·期 6
·924-928
·
IF 1.086
Qi Pengjia,Wang Ziying,Wang Rui,Xu Yinan,Zhang Tong
Synthetic graphene composite was modified on a transducer of quartz crystal microbalance(QCM) to fabricate a gas sensor for low concentration nitrogen dioxide(NO 2 ) detection. The gas sensing properties of the QCM coated with SnO 2 -rGO and AgNPs-SnO 2 -rGO composites were investigated when exposing QCM to low NO 2 con-centration(2.05—20.5 mg/m 3 ) atmosphere at room temperature. The sensing performances of the QCM with AgNPs-SnO 2 -rGO composites were enhanced by the introduction of Ag nanoparticles, and the QCM modified with AgNPs-SnO 2 -rGO composites could detect NO 2 at room temperature.
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Coatings
·
2017
·Vol. 7
·期 1
·16
·
IF 2.175
Hejie Yang,Yimin Gao,Weichao Qin
The corrosion behavior of Ni-P coating deposited on 3003 aluminum alloy in flue gas condensate was investigated by electrochemical approaches. The results indicated that nitrite acted as a corrosion inhibitor. The inhibiting effect of nitrite was reduced in solutions containing sulfate or nitrate. Chloride and sulfate accelerated the corrosion of Ni-P coatings greatly. This can provide important information for the researchers to develop special Ni-P coatings with high corrosion resistance in the flue gas condensate.Keywords:electroless Ni-P coating;anion;3003 aluminum alloy;flue gas condensate;pitting corrosion
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危险品化学品经营许可证（带存储）