JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2015
·Vol. 27
·期 3
·3021-3025
·
IF 1.569
Zhang Xiwei,Tang Zhenjie,Hu Dan,Wang Zhi,Yu Fengjun,Cui Haitao,Xu Tongshuai,Ju Lin
A facile method was used to oxidize p-type Zinc Selenide (ZnSe) nanowires into n-type Zinc Oxide (ZnO) through a 700 °C annealing process in air. Single crystal ZnSe nanowires, with a hole concentration of 0.805 × 10 18 cm −3 and
a negative photoconductivity, were oxidized into polycrystalline ZnO nanowires with an electron concentration of 4.88 × 10 18 cm −3 and a positive photoconductivity. Additionally, both the as-synthesized ZnSe nanowires and the post-oxidized ZnO nanowires presented excellent optoelectronic properties. This method can be used to construct radial p–n junctions or other nano-devices based on a single NW through a regioselective oxidation process.
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Food Analytical Methods
·
2015
·Vol. 9
·期 5
·1188-1198
·
IF 1.956
Xu Yong-Quan,Wang Chao,Li Chang-Wen,Liu Shun-Hang,Zhang Chen-Xia,Li Li-Wei,Jiang Dong-Hua
Aroma volatiles from ripened and raw pu-erh tea were extracted by headspace solid-phase microextraction (HS-SPME) and simultaneous distillation-extraction (SDE). They were then characterized and identified using gas chromatography-olfactometry (GC-O) and gas chromatography-mass spectrometry (GC-MS). The conditions of HS-SPME including fiber selections and sampling condition optimization have been previously investigated. With the two methods, 39 and 33 aroma-active compounds were detected and characterized in ripened and raw pu-erh tea samples, respectively. The aroma-active compounds with similar sensory descriptors were grouped into the same category, and the sum of individual aroma intensity values within each category showed that the floral aroma (33.01 %), stale/musty aroma (25.24 %), and woody aroma (11.17 %) were the major aroma categories in ripened pu-erh tea. Alcohols ( floral aroma notes), methoxyphenolic compounds ( stale/musty aroma notes), and ketones ( woody or floral aroma notes) play a vital role in the special flavor of ripened pu-erh tea. In raw pu-erh tea, the floral aroma (38.62 %) and fruity aroma (16.55 %) were the major aroma categories. These aromas were closely related to the characteristics of raw pu-erh tea aroma and its sensory perception.
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JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 52
·期 20
·12380-12389
·
IF 2.599
Li Jia-Chuang,Feng Fang,Yang Si-Han,Gu Yu-Ren,Xue Huai-Guo,Guo Sheng-Ping
Cu 3 Mo 2 O 9 nanorods (NRs) have been prepared via a facile hydrothermal method with subsequent heat treatment. The sample is characterized by the XRD, SEM, TEM, and XPS techniques. The results indicate that Cu 3 Mo 2 O 9 NRs crystallize in the orthorhombic space group Pnma and have the diameters at around 100 nm. As the anode material for lithium-ion batteries, Cu 3 Mo 2 O 9 NRs can deliver an initial discharge capacity of 1209 mAh/g at a current density of 300 mA/g in the potential window of 0.005–3 V, and a reversible capacity of 440 mAh/g can be maintained after 400 cycles. Furthermore, Cu 3 Mo 2 O 9 NRs still have the capacity of 437 mAh/g even at 1 A/g. The improved electrochemical performance of Cu 3 Mo 2 O 9 can be attributed to the effect of enhanced contact area and shortened Li + ions’ transport distance between the Cu 3 Mo 2 O 9 NRs and the electrolyte.
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CATALYSIS LETTERS
·
2021
·Vol. 151
·期 8
·2250-2256
·
IF 3.186
Liu Qi,Wang Shihao,Xu Gang,Wu Minghong,Chen Jianjun,Li Junhua
Abstract A novel TiO 2 -supported vanadium-substituted tungstophosphoric acid (PW 11 V/TiO 2 ) catalyst was designed and applied for selective catalytic reduction of NO x by NH 3 . Compared with the commercial tungstophosphoric acid (PW 12 /TiO 2 ), PW 11 V/TiO 2 displayed a nearly 90% activity improvement at 300 °C. In addition, the favorable resistance and stability to SO 2 were also obtained over PW 11 V/TiO 2 catalyst. Phase analysis and spectroscopy results indicated the vanadium was successfully incorporated into the molecular structure of PW 12 , and the Keggin framework still keep stable over the TiO 2 support. H 2 -TPR test proved the incorporation of vanadium promoted the redox ability of PW 11 V. The present study provides us an effective way to improve the performance of catalytic removal of NO x through tungstophosphoric acid catalyst. Graphic Abstract
After introduction of V species, the obtained PW 11 V/TiO 2 catalyst show better NH 3 -SCR performance and N 2 selectivity than PW 12 /TiO 2 catalyst.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Wang Enze,Xiong Zixin,Chen Zekun,Xin Zeqin,Ma Huachun,Ren Hongtao,Wang Bolun,Guo Jing,Sun Yufei,Wang Xuewen,Li Chenyu,Li Xiaoyan,Liu Kai
Solitary waves are unique in nonlinear systems, but their formation and propagation in the nonlinear fluid-structure interactions have yet to be further explored. As a typical nonlinear system, the buckling of solid thin films is fundamentally related to the film-substrate interface that is further vulnerable to environments, especially when fluids exist. In this work, we report an anomalous, solitary-wave-like blister (SWLB) mode of MoS 2 thin films in a humid environment. Unlike the most common telephone-cord and web buckling deformation, the SWLB propagates forward like solitary waves that usually appear in fluids and exhibits three-dimensional expansions of the profiles during propagation. In situ mechanical, optical, and topology measurements verify the existence of an interfacial water nanolayer, which facilitates a delamination of films at the front side of the SWLB and a readhesion at the tail side owing to the water nanolayer-induced fluid-structure interaction. Furthermore, the expansion morphologies and process of the SWLB are predicted by our theoretical model based on the energy change of buckle propagation. Our work not only demonstrates the emerging SWLB mode in a solid material but also sheds light on the significance of interfacial water nanolayers to structural deformation and functional applications of thin films.
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PubMed
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2021
·Vol. 29
·期 17
·24589-24598
·
IF 4.223
Zhang Jun,Wan Yi-ping,Liu Ze-hua,Wang Hao,Dang Zhi,Liu Yu
It is important to keep natural estrogen conjugates (C-NEs) intact in aqueous environmental sample before sample preparation; otherwise, this may influence the accurate determination of NEs. Therefore, this work thoroughly investigated the stability of C-NEs in three different aqueous environmental samples under four different storage conditions, room temperature, low temperature of 4 °C, low pH of 3, and addition of HgCl 2 at 2 g/L. Results showed that C-NEs in aqueous sample were easily deconjugated under low temperature of 4 °C, which has been widely used in sample collection and storage. Both the low pH of 3 and addition of HgCl 2 at 2 g/L under room temperature could keep C-NEs intact in domestic wastewaters and river water within 36 h, but the latter could keep C-NEs stable longer. This work is the first to show that low pH of 3 alone could keep C-NEs intact, which suggested that the combined condition at low temperature of 4 °C that has been widely used could be omitted. Meanwhile, compared to pH adjustment, addition of 2 g/L HgCl 2 into aqueous sample is more convenient and practical for 24-h composite sampling, which may be widely applied.
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APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
·
2019
·Vol. 125
·期 5
·1-9
·
IF 1.784
Feng Guyu,Wang Xinyue,Zhang Diantang,Xiao Xueliang,Qian Kun
The performance degradation of polypropylene (PP) fibers which induced by ultraviolet (UV) irradiation are commonly defect in service, especially in the outdoor environment. In this study, ZnO coated nano-TiO 2 with resistance in full range of UV irradiation is prepared by ultrasonic-microwave homogeneous precipitation method. The chemical structure, physical–chemical property, and atomic structure and surface morphology of the ZnO coated nano-TiO 2 are systematically investigated by FTIR, XRD, BET and TEM analysis. The uvioresistant PP fibers are prepared by melting blending method with PP and coated nano-TiO 2 as raw materials. The effect of coated nano-TiO 2 on UV resistance of PP fibers is described by carbonyl index, molecular weight and mechanical property. Results showed that PP fibers with coated nano-TiO 2 exhibited excellent UV shielding effect in full range of UV irradiation.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2016
·Vol. 408
·期 17
·4661-4667
·
IF 3.125
Zhou Lizi,Yang Zhaoguang,Zhi Tiantian,Zhou Zhou,Wang Xiaochen,Ren Chunmei,Qiu Bo
Succinylacetone was known to be a toxic metabolite of tyrosine in human and animals caused by blockage of the final step in tyrosine degradation pathway, but its existence in plant was unclear though the metabolic disturbance of tyrosine was also found in plant. A GC-MS method for determination of succinylacetone in Arabidopsis thaliana was developed for the first time. Both oximation and silylation were applied in the derivation procedure, and a low-temperature condition before completion of oximation was found to be necessary to obtain good linearity of the calibration curve due to the thermolability of succinylacetone. The specific chromatogram pattern formed by the four isomers of succinylacetone derivatives provided a helpful feature for its identification. The detection limit of the proposed method was 0.25 ppm in A. thaliana . The recoveries were between 95.4 and 109.3 % with the coefficient of variation ranging from 4.36 to 7.81 % for intra-day assays and 6.47 to 8.52 % for inter-day assays. Application to wild-type and the short-day sensitive cell death 1 mutant of A. thaliana represented an obvious correlation between the measured amount of succinylacetone and wilting symptom, suggesting the proposed method could be a powerful tool in further study on toxicology of succinylacetone and tyrosine catabolism in plants.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-11
·
IF 4.259
Wang Jing,Bu Yanyan,Wang Xiangfu,Seo Hyo Jin
Optical thermometry based on the up-conversion intensity ratio of thermally coupled levels of rare earth ions has been widely studied to achieve an inaccessible temperature measurement in submicron scale. In this work, a novel optical temperature sensing strategy based on the energy transfer from charge transfer bands of W-O and Eu-O to Eu 3+ -Dy 3+ ions is proposed. A series of Eu 3+ /Dy 3+ co-doped SrWO 4 is synthesized by the conventional high-temperature solid-state method. It is found that the emission spectra, emission intensity ratio of Dy 3+ (572 nm) and Eu 3+ (615 nm), fluorescence color, lifetime decay curves of Dy 3+ (572 nm) and Eu 3+ (615 nm), and relative and absolute sensitivities of Eu 3+ /Dy 3+ co-doped SrWO 4 are temperature dependent under the 266 nm excitation in the temperature range from 11 K to 529 K. The emission intensity ratio of Dy 3+ (572 nm) and Eu 3+ (615 nm) ions exhibits exponentially relation to the temperature due to the different energy transfer from the charge transfer bands of W-O and Eu-O to Dy 3+ and Eu 3+ ions. In this host, the maximum relative sensitivity S r can be reached at 1.71% K −1 , being higher than those previously reported material. It opens a new route to obtain optical thermometry with high sensitivity through using down-conversion fluorescence under ultraviolet excitation.
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Photonic Sensors
·
2019
·Vol. 10
·期 2
·97-104
·
IF 1.12
Tang Yiwen,Yuan Hui,Chen Jiangping,Xing Qiguo,Su Rongxin,Qi Wei,He Zhimin
We present a facile and effective method for fabrication of the localized surface plasmon resonance (LSPR) optical fiber sensor assisted by two polydopamine (PDA) layers with enhanced plasmonic sensing performance. The first PDA layer was self-polymerized onto the bare optical fiber to provide the catechol groups for the reduction from Ag + to Ag o through chelating and redox activity. As the reduction of Ag + proceeds, Ag nanoparticles (NPs) were grown in-situ on the PDA layer with uniform distribution. The second PDA layer was applied to prevent Ag NPs from oxidating and achieve an improvement of LSPR signal. The PDA/Ag/PDA-based optical fiber sensor has an enhanced LSPR sensitivity of 961 nm/RIU and excellent oxidation resistance. The stable PDA/Ag/PDA-based LSPR sensor with high optical performance is very promising for future application in optical sensing field.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2022
·Vol. 414
·期 20
·6047-6054
·
IF 4.478
Ma Qian,Qiao Juan,Liu Yufei,Qi Li
Recently, polymer-protected gold nanoparticles (AuNPs) have attracted extensive attention due to their good catalytic activities. However, how to regulate their catalytic activities by changing the polymer chain morphologies or the interactions between the ligands and the analytes through external stimuli is still a great challenge. This study describes a simple synthesis of AuNPs capped by thermo-responsive poly( N,N -dimethylacrylamide) (PDMAM). In comparison with three kinds of PDMAMs@AuNPs, PDMAM-2@AuNPs exhibited better peroxidase-mimic ability via the catalytic oxidation of 3,3’,5,5’-tetramethylbenzidine (TMB) with hydrogen peroxide (H 2 O 2 ) to generate oxidized TMB (oxTMB). Interestingly, its catalytic activity could be regulated by changing environmental temperature. Importantly, the addition of the antibiotic lomefloxacin endowed the PDMAM-2@AuNPs with enhancement in catalytic efficiency due to electrostatic interactions and the increased levels of reactive oxygen species. Based on this principle, a protocol for highly selective and sensitive monitoring of lomefloxacin has been constructed with the color change from pale blue to deep blue. The ultraviolet–visible absorbance of oxTMB at the wavelength of 650 nm showed a good linear relationship with antibiotic concentration in the range of 0.25–10.0 µM ( R 2 = 0.990). The limit of detection was 0.1 µM. The practical application of the proposed protocol with the promoted peroxidase-mimic activity for the measurement of lomefloxacin in capsules was realized. Graphical abstract
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CELLULOSE
·
2021
·Vol. 28
·期 5
·3249-3264
·
IF 5.044
Sun Ling,Xie Yutong,Wu Jiamin,Wang Huixin,Wang Shihao,Li Wennan,Zhang Jiaojiao,Zhang Zheng,Zhu Ping,Lu Zhou,Dong Chaohong
A novel flame retardant containing phosphorus and nitrogen elements, ammonium salt of N,N-dimethylene p-benzenesulfonic phosphonic acid (ADBSPA), was prepared by one-step continuous chemical method. The chemical structure of the ADBSPA was determined by nuclear magnetic resonance spectrum (NMR) and Fourier transform infrared (FTIR), and ADBSPA was processed onto cotton materials by immersion method. The flame retardancy of coated cotton materials was analyzed by limiting oxygen index (LOI) and Vertical burning test. The LOI value of cotton coated with 350 g/L ADBSPA increased from the original 18.2 ± 0.2% to 31.7 ± 0.2%, and the damaged length of this sample reduced to 6.6 ± 0.1 cm, which proved that ADBSPA enhanced the anti-burning ability of cotton materials. Cone calorimetry was used to evaluate the combustion behavior of cotton materials before and after coating. Compared with original sample, ADBSPA changed the combustion path of cotton materials, and the intuitive performance was that the ADBSPA-cotton-4 reserved 25.1 ± 0.5% of char residue at 250 s, and its peak heat release rate (PHRR) greatly reduced to 17 ± 1 kW/m 2 . The surface morphology of uncoated and coated cotton materials was characterized by scanning electron microscopy (SEM). It was observed that the coated sample still maintained a complete fiber skeleton after burning. In addition, thermogravimetric (TG) analysis confirmed that the coated cotton materials had good thermo-oxidative and thermal stability. All results pointed out that the phosphorus and nitrogen elements contained in ADBSPA as well as cotton cellulose constituted the three basic conditions of intumescent flame-retardant system. The polyphosphoric acid compounds formed by phosphorus element at high temperature promoted the dehydration of cotton fibers into char layer. The non-flammable gases produced by the nitrogen element in the combustion process covered the surface of fabrics, thereby playing the role of shielding heat and diluting combustible gases. Graphic abstract A novel phosphorus-nitrogen flame retardant was prepared by one-step continuous chemical method and applied to improve the thermal stability and anti-flammability of cotton materials.
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危险品化学品经营许可证（带存储）