CELLULOSE
·
2020
·Vol. 27
·期 15
·8923-8935
·
IF 4.21
Sun Longfei,Wang Fei,Jiang Jingjing,Liu Hangcheng,Du Binglei,Li Mingze,Liu Yixin,Li Minghua
Sodium alginate (SA), as the eco-friendly and human-safe biomass material not only can achieve effective dispersion of graphene nanoplatelets (GnPs), but also improve the interaction between GnPs and cellulose macromolecules. Based on this, a flexible and wearable GnPs/cellulose strain sensor with a special 2 × 2 double rib knitted fabric structure (KFGS) was prepared by a simple dip-coating method that could be used on a large scale. The KFGS exhibited dual sensing performance with high sensitivity (25.32 kPa −1 at 3 kPa pressure, gauge factor 32.62 at 25% tensile strain), stretchability (ε > 25%) and dynamic stability (signal drift < 6% after 300 cycles). Its potential application prospects were also predicted by the monitoring of human movement and physical parameters through a wireless Bluetooth connection.
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高影响因子
CATALYSIS LETTERS
·
2020
·Vol. 151
·期 2
·538-547
·
IF 2.482
Chen Han,Xu Qiong,Li Hui,Liu Jian,Liu Xianxiang,Huang Geng,Yin Dulin
Nickel supported on equilibrium fluid-catalytic-cracking catalysts (Ni/E-cats) were prepared by a simple grinding-pyrolysis method and employed for the transfer hydrogenation of ethyl levulinate (EL) to γ-valerolactone (GVL). 96.2% selectivity of GVL and 90.3% conversion of EL were obtained at 180 °C for 6 h over 30-Ni/E-cat. Through XRD, N 2 adsorption–desorption, NH 3 -TPD and SEM analysis, the high activity of the 30-Ni/E-cat catalyst was attributed to its dispersed Ni metal active centers and available acidic sites. Catalytic probe test revealed that metal and acid sites of Ni/E-cat played a synergistic catalytic role in the synthesis of GVL in 2-propanol, where Ni metal sites contribute to the hydrogenation of ketone group in EL, and acid sites of E-cat promoted the lactonization of intermediate ethyl- or isopropyl 4-hydroxyvalerate. Two reaction pathways and synergistic mechanism were proposed in this catalytic system. Moreover, Ni/E-cat catalyst exhibited good stability up to four cycles without obvious loss of catalytic activity. Graphic Abstract
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高影响因子
Scientific Reports
·
2020
·Vol. 10
·期 1
·1-10
·
IF 3.998
Ma Huiyan,Chen Yu,Chen Jinhui,Zhang Yunqiu,Zhang Tian,He He
Mikania micrantha and Ipomoea cairica are two invasive plants widely distribute and seriously damage in Hainan island. In this study, the leaves extracts of two weeds were collected and determined for their allelopathic potentials on Chrysanthemum coronarium . The phytotoxicity bioassay showed that when the extract concentration was 50 and 100 mg/ml, the inhibited effects of M. micrantha on growth of C. coronarium were greater than by I. cairica . However, when the extract concertation at 400 mg/ml, the opposite inhibited effects were observed. We speculated this phenomenon was caused by different allelopathic compounds. Therefore, using gas chromatography–mass spectrometry, 19 and 23 compounds were identified respectively, benzoic acid and cinnamic acid were the main components in the two leaves extracts, which were selected to carry out the further bioassays. Subsequent bioassay results showed the effects of two allelochemicals on morphological index and chlorophyll content and POD activity were all negative to C. coronarium , whereas the content of MDA and activity of SOD, CAT represented adverse changes. Moreover, the inhibitions by cinnamic acid were generally greater than those by benzoic acid. Thus, the phenolic acids played the most crucial roles in the allelopathic effccts of M. micrantha and I. cairica leaves extracts.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12921-12939
·
IF 3.553
He Yayue,Sun Shaofeng,Han Na,Zhang Xingxiang,Li Wei
Abstract Intelligent breathable membranes with multiple functions attach wide attentions of people which provide protection and comfort to meet the pressing demand for future protective clothing. We proposed a novel thermal energy regulated and thermochromic composite film with temperature-sensitive “breathable” stomata consisted of thermochromic nanofibrous membrane (TC-NFM) and thermo-sensitive polyurethane (PU) film. Thermochromic nanoencapsulated phase change materials (TC-NPCMs) were introduced as functional fillers into polyvinyl alcohol/water-soluble polyurethane (PVA/WPU) solution for electrospinning process. And methylated melamine–formaldehyde (MMF) was innovatively used to modify the water resistance of TC-NFM. By adjusting the molecular weight of the soft segment, the thermo-sensitive PU film was successfully prepared. Consequently, the prepared TC-NFM exhibited high enthalpy of 44.3 J g −1 and kept superior energy storage and release property even after 100th cyclic experiments. The water vapor permeability of thermo-sensitive PU film was triggered near the comfortable temperature of the human body. The results presented here might facilitate improvements in the field of thermal regulation clothing, intelligent clothing, wearable temperature sensor and reversible thermochromic coating materials. Graphic abstract
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高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2020
·Vol. 104
·期 15
·6767-6777
·
IF 3.53
Yan Zhiyu,Wu Xiangli,Zhao Mengran,Zhang Jinxia
High temperature is a major threat to Pleurotus ostreatus cultivation. In this study, a potential mechanism by which P. ostreatus mycelia growth is inhibited under heat stress was explored. Lactate, as a microbial fermentation product, was found unexpectedly in the mycelia of P. ostreatus under heat stress, and the time-dependent accumulation and corresponding inhibitory effect of lactate on mycelial growth was further confirmed. The addition of a glycolysis inhibitor, 2 -deoxy- d -glucose (2DG), reduced the lactate content in mycelia and slightly restored mycelial growth under high-temperature conditions, which indicated the accumulation of lactate can be inhibited by glycolysis inhibition. Further data revealed mitochondrial dysfunction under high-temperature conditions, with evidence of decreased oxygen consumption and adenosine triphosphate (ATP) synthesis and increased reactive oxygen species (ROS). The removal of ROS with ascorbic acid decreased the lactate content, and mycelial growth recovered to a certain extent, indicating lactate accumulation could be affected by the mitochondrial ROS. Moreover, metabolic data showed that glycolysis and the tricarboxylic acid cycle were enhanced. This study reported the accumulation of lactate in P. ostreatus mycelia under heat stress and the inhibitory effect of lactate on the growth of mycelia, which might provide further insights into the stress response mechanism of edible fungi. Key Points • Lactate can accumulate in Pleurotus ostreatus mycelia under heat stress and inhibit its growth. • The accumulation of lactate may be due to the acceleration of glycolysis and the dysfunction of mitochondria of P. ostreatus mycelia under high-temperature stress. • The glycolysis and tricarboxylic acid cycle of P. ostreatus mycelia were accelerated under high-temperature stress.
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PubMed
高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2020
·Vol. 22
·期 6
·1-10
·
IF 2.132
Liu Yuzhou,Huang Shuiping,Wang Chao,Gao Nan,Qiu Xiaoyang,Li Xing
In this work, Li 2 CoTi 3 O 8 nanofibers and Li 2 CoTi 3 O 8 ·CoTiO 3 ·TiO 2 (LCT) composite nanofibers as anode materials in lithium-ion batteries (LIBs) were successfully prepared by a traditional electrospinning technology, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), energy-dispersive spectrometer (EDS), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), and mappings. XRD confirms that the composite materials lattice planes well correspond to the patterns of Li 2 CoTi 3 O 8 , CoTiO 3 , and TiO 2 , respectively. SEM and TEM exhibits the fabricated composites are one-dimensional nanofibers with the diameter of 250~300 nm and 150~200 nm after annealing, respectively. The electrochemical properties of the materials for LIBs are investigated to indicate that the (LCT) composite nanofibers hold high reversible capacity of 201.68 mAh g −1 after 120 cycles and high rate capability at different current densities.
Li 2 CoTi 3 O 8 ·CoTiO 3 ·TiO 2 (LCT) composite nanofibers were prepared through a electrospinning, which hold high reversible capacity of 201.68 mAh g −1 after 120 cycles and high rate capability at different current densities.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 12
·7127-7138
·
IF 4.21
Liu Hanbin,Yang Xiaohan,Wang Jiaxi,Meng Qingjun,Qian Liwei,Wu Haiwei,Duan Chao,Li Zhijian,Zhou Hongwei
Abstract Separation of dyes and proteins from water remains a significant challenge. Common absorbents without recyclability might bring secondary pollutions, which may be avoided by developing stimuli-responsive smart absorbents. Here in this work, a CO 2 -responsive polymer poly(2-(dimethylamino) ethyl methacrylate) was grafted from cellulose fibers (Cell-g-PDEA). The chemical structure and surface morphology were confirmed with nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, X-ray powder diffraction and scanning electron microscope. The CO 2 -sensitivity was demonstrated by monitoring the pH, surface Zeta potential and dispersed appearance under stimulus of CO 2 . Furthermore, the modified cellulose fibers were packed into a syringe to construct a smart separation column that reversibly captured and released anionic dyes and proteins from water under gas stimulus. Comparing with traditional pH or temperature responsive materials, the CO 2 -responsive cellulose fibers take the advantages on energy-saving, good reversibility and moderate running conditions, thus might find applications in smart separations, clinical diagnose and therapies. Graphic abstract
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 13
·9974-9981
·
IF 2.22
Fan Xuemin,Li Peng,Du Juan,Chen Chong,Fu Peng,Hao Jigong,Yue Zhenxing,Li Wei
The (1 − x )[0.935(Bi 0.5 Na 0.5 )TiO 3 –0.065BaTiO 3 ]– x Ba(Zr 0.3 Ti 0.7 )O 3 (BNT–BT– x BZT) ceramics with high-energy storage properties were designed and characterized. All the BNT–BT– x BZT ceramics exhibit a pure perovskite structure. The grain size of ceramics becomes larger as the BZT content increases. Enhanced energy density performances ( W rec = 1.9 J/cm 3 , η = 86%) are achieved for the BNT–BT–0.4BZT ceramics at 210 kV/cm. Specifically, the energy stored in the material can be rapidly released within 0.27 µs. Excellent temperature stability with the variation of W rec less than 7% is realized in a wide temperature range from 20 to 140 °C. Moreover, the energy storage performances have good reliability after 10 5 electric field cycles. The high-energy storage performances indicate that the BNT–BT–0.4BZT ceramics are promising candidates in pulsed-power applications.
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高影响因子
Food Biophysics
·
2020
·Vol. 16
·期 1
·58-69
·
IF 2.387
Xu Qingqing,Ritzoulis Christos,Han Jianzhong,Han Feifei,Jin Weiping,Liu Weilin
This work studies the structural breakdown and nutrient release during in vitro digestion of soybean milk reconstituted from soybean flour with different particle sizes (> 100 mesh, 50–100 mesh, 28–50 mesh, 14–28 mesh and < 14 mesh). A clear effect of the particle size is noticed on the functional characteristics of the colloidal food during the gastric and intestinal digestion stages. In vitro gastric digestion significantly improves the release of polyphenols (21.4 ± 1.1–35.6 ± 3.2%, compared with the undigested one). In that stage, the antioxidant capacity increases between 20.8–38.5%, and is related to the particle size, hence free surface area, of soybean flour. Confocal microscopy shows that the proteins released from the soybean flour particles aggregate during gastric digestion, while the lipid droplets decompose down into smaller colloidal entities. Examination of the effect of particle size on the release of phenolic compounds, small molecule proteins/peptides, and fatty acids, showed that the highest amounts of the above substances existed when the particle size of soybean flour lies in the region of 50–100 mesh. This particle size also shows the highest bioaccessibility of the contained bioactive substances (polyphenols, 124.5 ± 0.5%; flavonoids, 49.1 ± 1.5%). These findings add insight on the role of the colloidal properties of the soybean flour with different particle sizes on the functionality of soybean milk.
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高影响因子
MACROMOLECULAR RESEARCH
·
2020
·Vol. 28
·期 11
·1032-1039
·
IF 2.047
Xu Chang-An,Lu Mangeng,Wu Kun,Shi Jun
Polyurethane (PU) elastomer has been widely used in many fields. In this work, polyurethane/polysiloxane elastomers are synthesized by one-step polymerization using polyether and polyester polyols. The properties of polytetramethylene ether glycol (PTMG) and polycarbonate (PCDL) on polyurethane/polysiloxane elastomers are characterized by various test methods. The results show that PTMG is superior to PCDL in heat resistance and hydrophobicity to polyurethane/polysiloxane elastomers. The heat resistance index of PTMGPU is as high as 154 °C, and its contact angle has reached 115.2°. In addition, the surface of PTMGPU contains more silicone. This may be because the chain structure of PTMG is conducive to the migration of siloxane to the surface, and then a Si-O-Si protective layer is formed, thereby improving the heat resistance and hydrophobicity of the surface of PTMGPU. PCDLPU shows good mechanical properties, which may be related to the stronger chain structure of PCDL. This provides a theoretical basis for the future application of polyurethane/polysiloxane materials.
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高影响因子
Plasmonics
·
2020
·Vol. 15
·期 6
·2061-2069
·
IF 2.335
Xu Runxiang,Yan Luting,Zhu Yanyun,Yin Lan,Song Xiaodong
Triangular Ag nanoplates have been synthesized via the seed-mediated method, which has good morphology and can be reproduced stably. The wavelength of local surface plasmon resonance (LSPR) can be easily controlled in the range of 500–900 nm. When triangular Ag nanoplates were applied to surface-enhanced Raman scattering (SERS) based on suspension aggregates and solid aggregates, the detection limit of rhodamine 6G (R6G) were greatly increased to 3.125 × 10 −7 M and 10 −11 M, respectively, and there was an excellent linear relationship between the intensity of Raman peak and the concentration of R6G. In addition, when the excitation light was tuned to the LSPR wavelength, the surface plasmon resonance will be excited to the maximum extent, and the enhanced electromagnetic field will maximize the Raman scattering. Furthermore, some progress has been made in the optimization of SERS by compounding graphene hydrogels in solid aggregates and adding mercapto polyethylene glycol in suspension aggregates.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 27
·12789-12800
·
IF 3.553
Han Jie,Jiang Weitao,Zhang Hongjian,Zhang Yajun,Feng Xueming,Wang Lanlan,Niu Dong,Lei Biao,Liu Hongzhong
There is a growing interest in the design and fabrication of small-scale soft actuators and robotics, especially the realization of functionalities mimicking biological systems with biomimetic motions in response to external stimuli. However, the mobility and self-weight are still the critical challenges for further improvement and broader application of soft actuators. It is attractive to develop untethered and ultra-light small-scale robotics by integrating the actuators and drivers while achieving the ability to respond to external stimuli. Inspired by the spiders that rely on electrostatic forces in the environment to stay airborne by their ballooning silk, a positively charged fiber-paper structure-based soft actuator is proposed. Utilizing electrospinning of tetraethyl orthosilicate (TEOS) solution, this ultra-light soft actuator can realize the movement of bending and high-frequency vibration with the stimuli of electrostatic force in the electric field. Programmable motions, i.e., continuous bending with a series of angles, variable frequency vibration, can be realized by regulating the external electric field. The 3D fluffy structure of the silica micro-nanofibers and the paper-based structure endow the soft actuator with ultra-lightweight and excellent flexibility. The untethered, ultra-light soft actuator suggests a feasible approach to develop ultra-light, soft and autonomous robotics and holds promise in reconnaissance and environmental detection. Graphic abstract
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高影响因子
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