CHINESE JOURNAL OF POLYMER SCIENCE
·
2019
·Vol. 38
·期 1
·17-23
·
IF 2.804
Chi Wei-Wen,Zhang Rong-Yuan,Han Ting,Du Jian,Li Hong-Kun,Zhang Wei-Jie,Li Yong-Fang,Tang Ben Zhong
The copper-catalyzed and metal-free azide-alkyne click polymerizations have become efficient tools for polymer synthesis. However, the 1,3-dipolar polycycloadditions between internal alkynes and azides are rarely employed to construct functional polymers. Herein, the polycycloadditions of dibutynoate ( 1 ) and tetraphenylethene-containing diazides ( 2 ) were carried out at 100 °C for 12 h under solvent- and catalyst-free conditions, producing soluble poly(methyltriazolylcarboxylate)s (PMTCs) with high molecular weights in high yields. The resultant polymers were thermally stable with 5% weight loss temperatures up to 377 °C. The PMTCs showed aggregation-induced emission (AIE) properties. They could work as fluorescent sensors for detecting explosive with high sensitivity, and generate two-dimensional fluorescent photopatterns with high resolution. Furthermore, their triazolium salts could be utilized for cell-imaging applications.
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JOURNAL OF MATERIALS SCIENCE
·
2019
·Vol. 54
·期 23
·14469-14482
·
IF 3.442
Gao Xing,Gong Xinchao,Nguyen Tat Thang,Du Wenxin,Chen Xueqi,Song Zihui,Chai Rusong,Guo Minghui
In this study, a luminescent material of wood-based carbon quantum dots (CQDs)/Ce 0.7 Zr 0.3 O 2 with a regular, uniform shape, and a high color purity was synthesized by a facile method. Ce x Zr 1− x O 2 solid-solution oxides ( x = 0.7) were prepared by a hydrothermal method, and CQDs were adsorbed on the as-obtained Ce 0.7 Zr 0.3 O 2 nanoparticles. The crystal structure was identified by powder X-ray diffraction and Rietveld refinement. In addition, the effect of adsorbed CQDs on the luminescence properties of Ce 0.7 Zr 0.3 O 2 was systematically investigated by Raman spectroscopy, elemental analysis, electron spin resonance spectroscopy, and photoluminescence spectroscopy, as well as decay curve and quantum yield (QY) measurements. Herein, a promising strategy of surface engineering, that is, reduction of the surface defect concentration in Ce 0.7 Zr 0.3 O 2 by the adsorption of CQDs to decrease the nonradiative transition processes at defect sites was described. As expected, the adsorption of CQDs decreased the Ce–O bond length and the surface defect concentration of Ce 0.7 Zr 0.3 O 2 , thereby effectively decreasing the nonradiative transition processes and suppressing fluorescence quenching. Hence, CQDs/Ce 0.7 Zr 0.3 O 2 with a perfect cubic structure exhibits a performance improvement in terms of the luminescence and QY value. Furthermore, a light-emitting diode device was fabricated using as-synthesized CQDs/Ce 0.7 Zr 0.3 O 2 , emitting apparent yellow light with a high color purity (93.3%), with International Commission on Illumination coordinates of (0.5239, 0.4531), and a low correlated color temperature (2271 K) under a driven current of 60 mA, suggesting that CQDs/Ce 0.7 Zr 0.3 O 2 exhibits potential for practical applications.
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JOURNAL OF NANOPARTICLE RESEARCH
·
2019
·Vol. 21
·期 8
·1-13
·
IF 2.009
Shu Miao,Li Xing
The specific capacity (781 mAh g −1 ) of SnO 2 as anode materials for lithium-ion batteries (LIBs) is much higher than that of commercial graphite materials (372 mAh g −1 ), which attracts great attention from researchers. In this paper, a series of Mn x Co 0.5− x Sn 0.5 O 2 ( x = 0.00, 0.15, 0.25, 0.35, 0.50) and SnO 2 porous nanofibers and nanoparticles are prepared through a single-spinneret electrospinning technique followed by a calcination process. The electrochemical properties of porous nanofibers and nanoparticles have been measured and discussed, and the results show that porous nanofibers have better performance when doped with manganese and cobalt components. With the increase of manganese contents, the electrochemical capability of the batteries is improved. As a demonstration, the Mn 0.50 Co 0.00 Sn 0.5 O 2 ( x = 0.50) porous nanofibers present the first discharge capacity of 1347.3 mAh g −1 , and after 100 cycles, Mn 0.50 Co 0.00 Sn 0.5 O 2 possesses the higher discharge capacity of 131.6 mAh g −1 when compared with the other materials.
Mn x Co 0.5− x Sn 0.5 O 2 ( x = 0.5) porous nanofibers were prepared through an electrospinning technique with a calcination process, which present the first discharge capacity of 1347.3 mAh g −1 at a current density of 100 mAh g −1 .
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Scientific Reports
·
2019
·Vol. 9
·期 1
·1-9
·
IF 4.011
Yang Yushan,He Haishan,Li Yougui,Qiu Jian
Robust, buoyant, superhydrophobic PVB/SiO 2 coatings were successfully formed on wood surface through a one-step solvothermal method and a nanoimprint lithography method. The as-prepared PVB/SiO 2 /wood specimens were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR), thermogravimetric/differential thermogravimetric (TG–DTG) analyses. The superhydrophobic property and abrasion resistance of rose-petal-like wood were measured and assessed by water contact angle (WCA) and sand abrasion tests. The results show that PVB/SiO 2 /wood not only exhibited a robust superhydrophobic performance with a WCA of 160° but also had excellent durability and thermostability during the sand abrasion tests and against corrosive liquids. Additionally, the as-prepared PVB/SiO 2 /wood specimens show high buoyancy.
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PubMed
高影响因子
POLYMER JOURNAL
·
2019
·Vol. 51
·期 11
·1211-1222
·
IF 2.639
Liu Guanghua,Lin Guanquan,Tan Mingyi,Zhou Hongjun,Chen Huayao,Xu Hua,Zhou Xinhua
To improve the utilization of pesticides and reduce the amount of pesticides used, sustained-release nanoparticles were prepared. Soybean protein isolate (SPI) and carboxymethyl cellulose (CMC) were modified to obtain hydrazine-modified SPI and aldehyde-modified CMC, respectively, and SPI-CMC was prepared by the condensation of hydrazine and aldehyde groups, forming a hydrazone bond. SPI-CMC was heated and loaded with avermectin (AVM) to obtain AVM/SPI-CMC. The encapsulation efficiency property, anti-ultraviolet property, sustained-release characteristics, pH responsiveness, and toxicological profiles were studied. The particles in the formulation were spherical-like, with sizes ranging between 150 and 250 nm. The encapsulation efficiency increased with the addition of SPI, which reached 44.49% when SPI was added in a mass ratio of m SPI-HYD : m CMC-ALD = 2:1. The percentage of remaining AVM in AVM/SPI-CMC was 31.47% higher than that in the AVM solution after UV irradiation for 43 h. Moreover, the nanoparticles were responsive to pH. SPI-CMC had no significant effect on the insecticidal toxicity of AVM. Environmental friendly SPI-CMC could protect and release pesticides continuously, which could improve the efficiency of pesticides.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2018
·Vol. 29
·期 7
·5287-5292
·
IF 2.324
Cao Renping,Quan Guanjun,Shi Zhihui,Gou Qingdong,Chen Ting,Hu Zuofu,Luo Zhiyang
Novel LiBaPO 4 :Bi 3+ yellow-emitting phosphor is synthesized by high temperature solid-state reaction method in air. With excitation 260 nm, LiBaPO 4 :Bi 3+ phosphor emits yellow light with the chromaticity coordinate (0.4272, 0.4657) and color rendering index 77.7. Emission band peaking at ~ 588 nm of LiBaPO 4 :Bi 3+ phosphor in the range of 400–790 nm is attributed to the 3 P 1 → 1 S 0 electron transition of Bi 3+ ion. Excitation band monitored at 588 nm in the range of 220–300 nm is assigned to the 1 S 0 → 3 P 1 electron transition of Bi 3+ ion. The optimal Bi 3+ ion concentration in LiBaPO 4 :Bi 3+ phosphor is ~ 1.0 mol%. Time resolved spectra and fluorescence lifetime data confirm that there is only Bi 3+ ion luminous center in LiBaPO 4 :Bi 3+ phosphor. The luminous mechanism is analyzed by configurational coordinate diagram of Bi 3+ ion. The experiment results are helpful to develop other new Bi 3+ -doped optical materials for solid-state lighting.
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FIBERS AND POLYMERS
·
2017
·Vol. 18
·期 12
·2278-2286
·
IF 1.113
Zhan Yi-zhen,Zhao Xue,Wang Wei
Three azo dyes had been synthesized using N-propyl substituted, dibromo-substituted and dicyano-substituted phthalimides as diazo components. All of the synthesized intermediates and dyes have been characterized by MS, 1H-NMR and IR analyses. The dyeing behaviour and fastness properties of these dyes had been investigated. The absorption maxima of the dyes were observed in the range 360 to 700 nm. The results indicated that dyes caused hypsochromism effect after -Br substitution and dyes caused bathochromism effect after -CN substitution. IR spectra of hydrolyzed dye showed that C=O groups appeared under relatively mild alkaline conditions. Compared with electron density, steric hindrance effect is an more important influence factor than electron density in hydrolysis reaction process. Exhaustion of dyed polyester/elastane fabrics decreased obviously as the pH value increased. In order to ensure dyeing levelness, heating rate of prepared dyes will be strictly controlled. Due to alkali-clearable property and interaction energy of dye-fiber and dye-dye, the dyes have good colorfastness.
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IONICS
·
2017
·Vol. 24
·期 9
·2697-2704
·
IF 2.062
Li Yanfei,Yu Jie,Chen Shouhui,Huang Zhenzhong,Wang Li
In this work, the commercial carbon paper was firstly peeled in K 2 CO 3 solution and then was further treated in a KNO 3 solution to form functional exfoliation graphene (FEG) on the commercial carbon paper. The FEG/carbon paper was characterized by Raman spectra and scanning electron microscopy, confirming that some typical layered fold graphenes were successfully peeled off and stood on the carbon paper matrix. Then, Fe 3 O 4 nanoparticles (NPs) were grown on the surface of FEG/carbon paper and the as-prepared Fe 3 O 4 NPs/FEG/carbon paper was directly used as supercapacitor electrode. The specific capacitance of Fe 3 O 4 NPs/FEG/carbon paper was about 316.07 F g −1 at a current density of 1 A g −1 . Furthermore, the FEG/carbon papers were also functionalized by benzene carboxylic acid to form FFEG/carbon papers, and then the Fe 3 O 4 NPs were grown on the surface of FFEG/carbon paper. The specific capacitance of Fe 3 O 4 NPs/FFEG/carbon paper was 470 F g −1 at a current density of 1 A g −1 , superior to some previous reported results. This work might provide a new strategy to prepare various nanostructures on FFEG/carbon papers for future applications.
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MICROCHIMICA ACTA
·
2017
·Vol. 185
·期 1
·1-8
·
IF 4.58
Wen Yilin,Yuan Jianyong,Chen Jun,Zhao Yilin,Niu Yazhen,Yu Chao
This research describes a nanowire network-based method for detecting the activity of myeloperoxidase (MPO), a biomarker of acute coronary syndromes (ACS). Trimetallic CuPdPt nanowire networks (CuPdPt NWNWs) were prepared by a one-step chemical reduction method. The metallic precursors quickly form nanowire network structures without the need for additional capping agents or surfactants. This process creates a product with a clean surface. The NWNWs were dropped onto a glassy carbon electrode (GCE) to obtain a sensor with good catalytic activity towards the reduction of hydrogen peroxide (H 2 O 2 ), which was used as an electrochemical probe working at −0.4 V (vs. SCE). It also provided a large surface for further modification. Next, an antibody against MPO was immobilized on the modified GCE via the stable conjunction between Cu, Pt, Pd and amino groups. Upon binding of MPO to the antibody on the GCE, the current response to H 2 O 2 was reduced by 35 μA·cm −2 . The immunosensor had a linear response within the 100 fg·mL −1 to 50 ng·mL −1 MPO concentration range and a 33 fg·mL −1 detection limit (at an S/N ratio of 3). The recovery of spiked serum samples ranged from 99.8 to 103.6%. This result suggests that the method can be applied to the quantitation of MPO in human serum samples.
A trimetallic CuPdPt nanowire networks was placed on a glassy cabon electrode (GCE) to design an immunosensor for myeloperoxidase (MPO), a biomarker for the acute coronary syndrome (ACS). Antibody against MPO was immobilized on the network via conjugation between Cu, Pt, Pd and amino groups. Amperometric i-t measurements were conducted to quantify the amount of MPO that binds to the antibody on the surface of the modified GCE.
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JOURNAL OF PLANT GROWTH REGULATION
·
2017
·Vol. 37
·期 3
·745-754
·
IF 2.073
Zhang Qi,Li Li,Li Jiayu,Wang Haibin,Fang Changxun,Yang Xiaoyan,He Haibin
An allelopathic rice PI312777 and a non-allelopathic rice Lemont were hydroponically cultured and treated with extracts of seeds and tissues and root exudates of barnyard grass ( Echinochloa crus-galli , BYG) to induce an allelopathic response. The results of bioassays showed that the % inhibition of two rice leaf extracts was significantly ( p < 0.05) increased by treatment with BYG root exudates. This induced trait was dosage- and time-dependent. The highest % inhibition for both PI312777 and Lemont was obtained following treatment with 15 mL of BYG root exudates for 2 days. Under these conditions, total allelopathy (TA) values of PI312777 on root length, plant height, and plant dry weight of BYG were 73.39, 68.01, and 70.42%, respectively, and induced allelopathy (IA) values were 21.53, 17.04, and 16.62%, respectively, accounting for 24–29% of TA. Correspondingly, TA values of Lemont were 28.38, 21.38, and 23.38%, respectively, and IA values were 14.49, 11.37, and 12.11%, respectively, accounting for 51–53% of TA. The % inhibition of two rice culture solutions was in agreement with the results of their leaf extracts. The total contents of 7 phenolic acids in the culture solutions of PI312777 and Lemont were 2.18 and 1.47 times, respectively, as much as those in the control solutions. The phenylalanine ammonia-lyase ( PAL ) gene in PI312777 leaves was significantly up-regulated after induction treatments. The results indicated that rice allelopathy is a chemical induction mechanism, and confirmed that chemical induction to raise rice allelopathy is a practical and feasible method.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2017
·Vol. 35
·期 12
·1572-1586
·
IF 1.692
Cong Houluo,Xu Sen,Zheng Sixun
A series of mixed, random cylindrical brush copolymers bearing polystyrene (PS) and poly( ε -caprolactone) (PCL) side chains were synthesized via the combination of ring-opening polymerization (ROP) and atom transfer radical polymerization (ATRP). These novel cylindrical brush copolymers have been characterized by means of nuclear magnetic resonance (NMR) spectroscopy, gel permeation chromatography (GPC) and differential scanning calorimetry (DSC). It was found that the mikto-armed cylindrical brush copolymers were microphase-separated in bulks and that the morphologies were dependent on the mass ratios of PS to PCL side chains. One of the cylindrical brush copolymers was employed to incorporate into epoxy thermoset to investigate effect of the mikto-armed cylindrical brush architecture on the reaction-induced microphase separation behavior. Depending on the concentration of the cylindrical brush in epoxy, the thermosets can display the morphologies with the spherical, worm-like and lamellar PS microdomains dispersing in continuous thermosetting matrices.
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Scientific Reports
·
2017
·Vol. 7
·期 1
·1-15
·
IF 4.259
Sun Zhi,Zuo Lihua,Sun Tongwen,Tang Jinfa,Ding Daling,Zhou Lin,Kang Jian,Zhang Xiaojian
To clarify and quantify the chemical profiling of XueBiJing injection (XBJ) rapidly, a feasible and accurate strategy was developed by applying ultra high performance liquid chromatography-Q Exactive hybrid quadrupole-orbitrap high resolution accurate mass spectrometry (UHPLC-Q-Orbitrap HRMS). A total of 162 components were characterized, including 19 phenanthrenequinones, 33 lactones, 28 flavonoids and 12 phenolic acids and 51 other compounds. Among them, 38 major compounds were unambiguously quantified by comparing with reference standards. Meanwhile, 38 representative compounds were simultaneously detected in XBJ samples by Q-Orbitrap HRMS. Satisfactory linearity and correlation coefficient were achieved with wide linear range. The precisions, repeatability, stability and recovery were meeting requirements. The validated method was successfully applied for simultaneous determination of 38 bioactive compounds in 10 batches XBJ samples. In addition, the similarity evaluation of fingerprintings was applied to assess the quality of XBJ. And the results were evaluated by multiple statistical strategies and five compounds might be the most important chemical markers for chemical quality control of XBJ. Finally, a rapid and simple UPLC-MS/MS method was developed for determination of five markers in XBJ sample. This research established a high sensitive and efficient strategy for integrating quality control, including identification and quantification of XBJ.
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