IONICS
·
2021
·Vol. 27
·期 8
·3615-3626
·
IF 2.817
Lu Yao,Yang Quanling,Wang Shan,Liu Man,Chen Yu,Zhao Zhenghui,Akbar Abdul Rehman,Xiong Chuanxi,Hu Guo-Hua
The electrochemical performances of reduced graphene oxide (RGO)/poly-3,4-dioxyethylenethiophene (PEDOT) aerogels as supercapacitor electrode materials were evaluated. The PEDOT was synthesized by oxidative polymerization of 3,4-dioxyethylenethiophene (EDOT). It was doped by nonylphenol polyoxyethylene ether sulfate (NPES) in order to become a flowable material (F-PEDOT) at or near room temperature. Hydrothermal treatment of a mixture of graphene oxide (GO) and F-PEDOT led to reduced graphene oxide (RGO) and dedoped PEDOT (RGO/PEDOT) aerogels which possessed a high specific surface area and a good compressive modulus. When used as a supercapacitor electrode material, it exhibited a high capacitance of 400 F·g −1 at a current density of 0.5 A·g −1 , and 234 F·g −1 at a high current density of 20 A·g −1 in the three-electrode test system. It retained almost its initial capacitance over 6000 charge–discharging cycles even at a current density of 10 A·g −1 . Moreover, the RGO/PEDOT//RGO asymmetric supercapacitor (ASc) exhibits a maximum energy density of 14.16 W h·kg −1 at a power density of 1.53 kW·kg −1 and displays an acceptable cycle stability with 83.4% of the initial capacitance retention after 8000 charging–discharging cycles at a high rate of 6.25 A·g −1 .
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高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 36
·期 9
·1883-1898
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IF 3.089
Liu Mingxing,Liu Jian,Wang Yu,Wang Wanxia,Zhu Hongda,Guo Huiling,Sun Hongmei
Abstract Redox-responsive colloidal mesoporous silica nanoparticles (CMS) drug delivery systems based on fluorescence resonance energy transfer (FRET) was successfully designed for targeting and real-time monitoring in potential cancer therapy. FRET-CMS indicated the typical type IV isotherm with uniform distribution and wormhole arrangement of mesopores. In vitro release studies indicate the redox-sensitive drug release behaviors. Furthermore, the release of entrapped drugs in real time is monitored by the changed FRET signals of FRET-CMS, which is effectively controlled due to the eliminating FRET with the dissociation of FRET donor–acceptor pair. Fluorescent images of cellular uptake and cell viability test revealed that FRET-CMS enhanced significantly 6-MP accumulation in Hela cells with CD44 receptor over-expressed compared to MCF-7 cells due to the existence of hyaluronic acid and subsequently induced selective cytotoxicity to Hela cells. The obtained results illustrate that FRET-CMS may be a promising nanocarrier for drug delivery systems in cancer therapy. Graphic abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 12
·16866-16880
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IF 2.478
Chen Han Xiang,Gui Yang
We report a template method by rationally designing a self-supported Ni 3 S 2 nanosheet-wrapped ZnO nanorod (Ni 3 S 2 @ZnO) standing vertically on Ni foam surface. In this work, an organic molecule of 2-methylimidazole (2-MI) using as a structural director, which is commonly used in metal–organic frameworks(MOFs), has been adopted to link those Ni 3 S 2 nanosheets forming a shear-wall structure. This special morphology with multi-dimension (2D with 1D) exhibits advantages on the high capacitance of about 3546 F g −1 at a current density of 0.5 A g −1 . Besides this, Ni 3 S 2 @ZnO can deliver an extraordinarily capacitance of 1872 F g −1 even at a high current density of 25 A·g −1 , which in the meantime displayed a good capacity retention of 70.3% after 10,000 cycles. An asymmetric supercapacitor was then constructed, performing a quite stable capacitance of about 197 F g −1 at a high current density of 15 A g −1 for 5000 cycles and a sufficient energy density of 140 Wh kg −1 , which proves its potential on lighting up six red LEDs in practical usage.
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 12
·7995-8008
·
IF 5.044
Gao Qian,Wang Jiabao,Liu Jing,Wang Yuda,Guo Jinge,Zhong Ziyi,Liu Xinliang
Cellulose nanocrystals (CNCs) with high crystallinity exhibit high mechanical stiffness and strength. However, the high dispersibility of CNCs results in limited spinnability and orientation. In this study, oxidized nanocellulose was selected to obtain regionally oxidized CNCs (RO-CNC) with carboxyl groups appended. For the formation of orientable and extensible RO-CNC filaments, chitosan was introduced as the sheath solution to induce orientation by electrostatic action. The chemical structures were analyzed by Fourier transform infrared spectroscopy. The morphology of the oriented CNCs filaments was characterized by scanning electron microscopy and wide-angle X-ray scattering. Analysis of the relationship between the mechanical strength and the CNCs directional arrangement revealed that the mechanical strength of the composite fibers increased with the injection speed ratio as a result of the orientation of the RO-CNC. The mechanical strength of the oriented reinforced composite filaments reached as high as 104 MPa with an orientation index of 0.73. The tensile strength and elastic modulus of the filaments increased by 33% and 20%, respectively, compared to the unmodified CNCs spun fiber. Graphic abstract
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高影响因子
Nano Research
·
2021
·Vol. 15
·期 1
·519-527
·
IF 8.897
Zhou Dan,Zhang Leilei,Liu Xiaoyan,Qi Haifeng,Liu Qinggang,Yang Ji,Su Yang,Ma Jingyuan,Yin Jianzhong,Wang Aiqin
Fine-tuning of the coordination environment of single-atom catalysts (SACs) is effective to optimize their catalytic performances, yet it remains challenging due to the vulnerability of SACs. Herein, we report a new approach to engineering the coordination environment of M-N-C (M = Fe, Co, and Ni) SACs by using glutamic acid as the N/C source and pyrolysis atmosphere as a regulator. Compared with that in N 2 , NH 3 was able to promote the doping of N at T < 700 °C yet etch the N-species at higher temperatures, by which the M-N coordination number (CN) and the electronic structure were delicately tuned. It was found that the electron density of Ni single atoms increased with the decrease of Ni-N CN. As a consequence, the capability of Ni-N-C to dissociate H 2 was greatly enhanced and a higher catalytic activity in chemoselective hydrogenation of functionalized nitroarenes was achieved. Moreover, this modulation method could be applied to other transition metals including Fe and Co. In particular, the as-synthesized Co-N-C SAC afforded a turnover frequency of 152.3 h −1 with 99% selectivity to 3-vinylaniline in the hydrogenation of 3-nitrostyrene, which was the highest ever reported thus far and was at least one order of magnitude more active than state-of-the-art noble-metal-free M-N-C catalysts, demonstrating the great potential of engineering the coordination environment of SACs.
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高影响因子
FIBERS AND POLYMERS
·
2021
·Vol. 23
·期 2
·386-395
·
IF 2.153
Xu Qingbo,Wang Peng,Zhang Yanyan,Li Changlong
k]Immobilizing inorganic particles such as zinc oxide (ZnO), titanium dioxide (TiO 2 ), silver nanoparticles (Ag NPs) or grafting special biopolymer such as chitosan on cotton fabrics is the main method to prepare antibacterial and ultraviolet (UV) protective cotton fabrics. However, poor durability and complex finishing methods are still of the main defects of antibacterial and UV protective fabric samples. In the present work, the Ag/TiO 2 colloid solution was prepared with using the carboxymethyl chitosan (CMC) as a stabilizer, then the CMC and Ag/TiO 2 composite nanoparticles were coated on the fabric via finishing technology of pad-dry-cure. As a result, the modified fabric showed excellent antibacterial and UV protective properties, with the values of bacterial reduction (BR) and ultraviolet protection factor were reached at 99.5 % and 79.0, respectively. Moreover, even after 50 washing cycles, these properties of the finished fabrics were not obviously reduced. These results demonstrated that the finished fabric sample has durable antibacterial and UV protective properties which could has a great potential application in the field of medical and outdoor apparel.
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高影响因子
EUROPEAN FOOD RESEARCH AND TECHNOLOGY
·
2021
·Vol. 247
·期 9
·2171-2181
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IF 2.998
Zhang Bo,Li Hongzhou,Li Yan,Fu Xiaoling,Du Daolin
Sensitive and rapid analysis of zearalenone (ZEN) in grains and feed is essential to guarantee the food security for human health. Herein a chemiluminescence method was demonstrated to measure the content of zearalenone in food samples. An immunomagnetic beads-anti-ZEN monoclonal antibody complex was prepared. Besides, the immunomagnetic beads were utilized as the solid support for rendering the immunoassay through the rapid formation of immune complexes in the solution, rapid separation and efficient heterogeneous detection. Under the optimal experimental parameters, the standard curve of ZEN detection is y = − 0.3839x + 0.1565 ( R 2 = 0.9978), the signal ratio has a well linear relationship with the logarithm of ZEN concentration in the range of 0.03–2.43 ng/mL. The limit detection of zearalenone in the developed assay was 0.01 ng/mL. The applicability of the reported approach for zearalenone detection in grains was demonstrated. In addition, the good recoveries of zearalenone were obtained, ranging from 85.15 to 102.60% at 5, 50, 150 ng/g spiked ZEN concentrations. The relative standard deviation was < 10%. The proposed chemiluminescence immunoassay is sensitive, simple, rapid and reliable for monitoring of zearalenone contamination, which provides a powerful avenue for further application of other mycotoxin in food analysis.
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Advanced Fiber Materials
·
2021
·Vol. 3
·期 4
·239-250
·
IF 0
Xue Lili,Fan Wei,Yu Yang,Dong Kai,Liu Chengkun,Sun Yanli,Zhang Cong,Chen Weichun,Lei Ruixin,Rong Kai,Wang Qi
Wearable and portable electronic devices based on textile structure have been widely used owing to their wearability and comfortableness. However, yarn fineness and the comfort of the fabric cannot satisfy the requirements of smart wearable devices. This work presents a novel strategy to prepare highly integrated PVDF/conductive nylon core-sheath structure piezoelectric yarns for wearable which is fabricated by combining electrospinning strategy with 2D braiding technology. The fineness of single yarns as well as strength are both improved significantly compared to previous works. The piezoelectric outputs of the yarn are still stable after 800 s fatigue test at a frequency of 4 Hz, and the cycle stability can maintain more than 3200 cycles. Furthermore, the piezoelectric yarns are further woven into piezoelectric plain fabric. According to the electrical performance, the length of the piezoelectric yarn and the thickness of the piezoelectric layer would both affect the output electrical performance. The yarn of the 10 cm in length and 600 μm in fineness can produce an output voltage of 120 mV. Meanwhile, Both the piezoelectric yarn and the fabric could generate piezoelectric output signals through human movement, such as bending, walking. Therefore, the electrical and mechanical performance of the piezoelectric yarns prepared in our work could be improved significantly, and the comfortableness and durability performance of the piezoelectric fabric can satisfy most wearing requirements, which would provide some help in the field of piezoelectric wearable devices based on yarns and fabrics. Graphical Abstract
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CELLULOSE
·
2021
·Vol. 28
·期 11
·7327-7339
·
IF 5.044
Xu Yongjian,Shi Yun,Chen Xuyong,Liu Fenfen,Zhao Wei
As the living standard improves, disposable sanitary and household paper requires not only softness or easy to fluff in a dry state, but also good antibacterial property. In this study, a series of alkyl quaternary ammonium salts ( AQAS ), a kinds of antibacterial-debonding agents, were synthesized by using a two-step process. The SN2 nucleophilic substitution reaction was designed between triethanolamine and sulfoxide chloride, and followed subsequent quaternization by tertiaryamines with different long alkyl chains. The obtained products can be used as an antibacterial and softening/debonding agent for improving the performance of paper or fluff pulp. The results showed that these new compounds can endow antibacterial function and high softness to paper or control appropriate burst strength to fluff pulp. These AQAS products can be not only used in daily disposable sanitary products, but also have potential applications in other products such as glass spacer paper, advanced household paper, or antibacterial tissue products to prevent microbial contamination.
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高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 7
·1-13
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IF 3.097
Yao Qi,Lan Hai,Li Xin,Chen Youyi
Organic–inorganic interpenetrating network poly (acrylic acid- co -acrylamide) IPN-P(AA-co-AM) polymer sphere with core–shell structure has been synthesized by modified suspension polymerization, which the core is high cross-linked and shell is light cross-linked, respectively. The dispersed phase (water phase) and continuous phase (oil phase), as well as core and shell crosslinking agent are screened based on the water absorption capacity of the polymer spheres. In addition, SiO 2 is applied to endow polymer spheres with excellent thermal and water absorption properties. FTIR, TG, SEM, and XPS analyze the chemical structure, thermal properties, morphology and surface element of polymer spheres, respectively. Particularly, the forming mechanism of polymer spheres and water absorption dynamic model are discussed in detail. The results show that the Organic–inorganic IPN-P(AA-co-AM) polymer spheres are successfully synthesized. The polymer spheres could be wrapped effectively when the SiO 2 content up to 2%. Compared to polymer spheres without SiO 2 , the thermal stability is greatly improved. The optimum core and shell crosslinking agent are pentaerythritol triacrylate (PETA) and sodium alginate, respectively. The maximum absorption capacity of polymer spheres for distilled water and 0.9wt% sodium chloride can up to 922.22 g/g and 93.87 g/g, respectively. Finally, the water absorption of IPN-P(AA-co-AM) polymer spheres dynamic model is closed to second-order.
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高影响因子
RARE METALS
·
2021
·Vol. 40
·期 9
·2538-2551
·
IF 4.003
Han Zhi-Xin,Liu Xiang-Mei,Tan Lei,Li Zhao-Yang,Zheng Yu-Feng,Yeung Kelvin Wai-Kwok,Cui Zhen-Duo,Liang Yan-Qin,Zhu Sheng-Li,Wu Shui-Lin
Abstract Controlling the corrosion rate is critical for practical applications of Mg-based alloys. In this work, we constructed a protective coating of hybrid polycaprolactone (H-PCL)/indocyanine green (ICG) on AZ31 Mg alloy, whose degradation rate was controlled by 808-nm near-infrared (NIR) light irradiation. The corrosion behaviors of H-PCL/ICG coated Mg alloys were systematically investigated by potentiodynamic polarization tests, electrochemical impedance spectroscopy (EIS) and hydrogen evolution experiments. The results disclosed that the H-PCL/ICG composite coating could effectively protect Mg alloy from corroding without NIR light irradiation. In contrast, under 808-nm NIR light irradiation, the corrosion resistance of this composite coating was decreased significantly, i.e., the corrosion current density ( i corr ) increased from (8.81 ± 1.068) × 10 −8 to (1.22 ± 0.545) × 10 −6 A·cm −2 . This is because the component of ICG in the coating was excited to produce heat locally, which triggered the glass transition temperature ( T g ) of H-PCL in the coating, resulting in the motion of the molecular chain segment. Consequently, the electrolytes penetrated the coating and corroded the Mg substrate. In vitro biological experiment indicated that the synthesized coating exhibited good cytocompatibility. Hence, these findings will provide a new strategy for designing novel photoresponsive coatings to remotely adjust the degradation rate of biodegradable metals for biomedical applications. Graphic abstract
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高影响因子
CELLULOSE
·
2021
·Vol. 28
·期 6
·3647-3662
·
IF 5.044
Yang Junjie,Yao Jintong,Ma Yingying
Biological gel paper actuators (BGPAs) constitute a rising class of electroactive smart artificial muscles with the advantages of large deformation and high energy density at low cost, and they are extensively used in areas such as soft robots, aerospace applications, and biomedical engineering. In this study, a double-side casting process and evaluation methods were proposed for manufacturing electroactive BGPAs and testing their output force characteristics. Furthermore, the effect and optimization mechanism of the double-side casting temperature on the output force performance and electrically activated mechanochemical behavior of a BGPA were studied in depth under single-cycle and repeated work periods. The experimental results demonstrated that when the casting temperature was 50 °C, various hydrogel membranes of BGPAs had optimal connections, with a penetration thickness of 6 μm, which reduced the interfacial contact resistance and drastically increased the quantity of interlayer hydrated ions. Moreover, the specific capacitance of this BGPA reached a maximum at 551.34 mF/g, but its elastic modulus, internal resistance and water loss rate all reached minimum values of 5.934 MPa, 1.91 Ω and 0.176%, respectively. Hence, the ideal values of the working life and output force density were similarly obtained for the BGPA, which were 891 s and 16.249 mN/g, respectively. In general, this optimized high-performance BGPA holds great value for the development and validation of natural smart polymers and engineering solutions. Graphic abstract
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高影响因子
危险品化学品经营许可证（带存储）