CELLULOSE
·
2020
·Vol. 27
·期 7
·3971-3988
·
IF 4.21
Deng Yudi,Chen Jinyuan,Huang Jinyu,Yang Xushan,Zhang Xudong,Yuan Sijie,Liao Wenzhen
Abstract The composite hydrogel was prepared with cellulose and flaxseed gum and characterized by fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Brunauer–Emmitt–Teller (BET) and thermogravimetric analysis (TGA). The swelling property, drug adsorption, biocompatibility and hemostatic function of composite hydrogel were investigated. The composite hydrogel had the pore structure and exhibited high stability with a thermal decomposition temperature of 332.66 °C. And the composite hydrogel showed excellent swelling capability with a moisture expansivity of over 200%, and with a drug adsorption capacity of 7.27 ± 0.15 mg/g. Mechanical properties tests showed that as the proportion of flaxseed gum increased, the ability to withstand pressure of hydrogel was improved. In addition, MTT assay, flow cytometry analysis, and in vivo toxicological evaluation suggested that composite hydrogel had good biocompatibility. Moreover, hemostatic potential assay and wound healing were made in order to evaluate the effect of hemostasis and wound healing of composite hydrogel and our results indicated that the composite hydrogel with cellulose and flaxseed gum could be effective to promote hemostatic and wound healing function. All in all, the great properties exhibited by the composite hydrogel could make it a potential candidate as biomaterial in bleeding and wound treatment. Graphic abstract
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高影响因子
Nano-Micro Letters
·
2020
·Vol. 12
·期 1
·1-15
·
IF 12.264
Zhai Xian-Zhi,Qu Jin,Hao Shu-Meng,Jing Ya-Qiong,Chang Wei,Wang Juan,Li Wei,Abdelkrim Yasmine,Yuan Hongfu,Yu Zhong-Zhen
A layered sodium-ion/crystal water co-intercalated Na 0.55 Mn 2 O 4 ·0.57H 2 O (NMOH) cathode is synthesized successfully with a selectively etching method for zinc-ion batteries.
A displacement/intercalation mechanism is confirmed in the Mn-based cathode for the first time.
The NMOH cathode delivers a competitive reversible capacity of 201.6 mA h g −1 at 500 mA g −1 after 400 cycles.
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PubMed
高影响因子
Nature Catalysis
·
2020
·Vol. 3
·期 2
·170-178
·
IF 30.471
Huang Zhipeng,Zhao Zhitong,Zhang Chaofeng,Lu Jianmin,Liu Huifang,Luo Nengchao,Zhang Jian,Wang Feng
The decarboxylation of bio-derived fatty acids provides a sustainable pathway for the production of alkane products under mild conditions; however, products are generally obtained in low selectivity due to the uncontrollable reactivity of radical intermediates. Here we demonstrate that photogenerated radicals can be rapidly terminated by surface hydrogen species during photocatalytic decarboxylation of fatty acids on a hydrogen-rich surface that is constructed by the interactions between H 2 and Pt/TiO 2 catalyst, thereby greatly inhibiting oligomerization; C n – 1 alkanes can therefore be obtained from bio-derived C 12 –C 18 fatty acids in high yields (≥90%) under mild conditions (30 °C, H 2 pressure ≤0.2 MPa) and 365 nm light-emitting dode irradiation. Industrial low-value fatty acid mixtures (namely, soybean and tall oil fatty acids) can be transformed into alkane products in high yields (up to 95%). Our research introduces an efficient biomass-upgrading approach that is enabled by subtle control of the radical intermediate conversion on a heterogeneous surface.
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高影响因子
Food Analytical Methods
·
2020
·Vol. 13
·期 5
·1069-1077
·
IF 2.667
Hu Gaoshuang,Gao Shan,Han Xue,Yang Lixin
Colloidal gold, quantum dots (QDs), and upconversion nanoparticles (UCNPs), which were respectively labeled with monoclonal antibody against norfloxacin (NOR), were employed as signal probes to establish three types of immunochromatographic strips, and the strips were evaluated according to their ability to detect NOR in milk samples. The results showed that the visual detection limit of NOR was 2.0 μg L −1 in the standard solution and 20.0 μg L −1 in milk samples when using colloidal gold-immunochromatographic strips (ICS). When QD-based fluorescence immunochromatographic strips (FICS) were used, the visual detection limit was 2.0 μg L −1 in the standard solution and 10.0 μg L −1 in milk samples. If UCNP-based FICS strips were employed, the visual limit of detection was 0.5 μg L −1 in the standard solution and 2.5 μg L −1 in milk samples. Besides, the results from the proposed methods showed high agreement with results yielded by using commercial ELISA kits, indicating the good accuracy of these strips. Compared with colloidal gold-ICS, QDs-FICS showed similar sensitivity in the standard solution and a two-fold higher sensitivity in milk samples. Meanwhile, UCNPs-FICS yielded the highest sensitivity both in standard solution and in milk samples, and they were also more stable in normal laboratory conditions (that is, they could be exposed to regular room light). Additionally, the two fluorescence nanoparticle-based test strips could be built with less antibody and coating antigens and can be cost-effective. In conclusion, the proposed QDs-FICS and UCNPs-FICS could be employed as cost-effective alternative methods for sensitive, rapid, and on-site detection of NOR in milk samples.
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高影响因子
Journal of Inorganic and Organometallic Polymers and Materials
·
2020
·Vol. 30
·期 12
·5074-5084
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IF 1.941
Wu Lin,Pang Tao,Wu Laxia,Guan Yebin,Yin Liwei,Li Yiguo
Herein, we report a novel method for the synthesis of Prussian blue/PB containing polymeric hybrid nanoparticles. This method employs poly(4-vinylpyridine)/P4VP stabilized polystyrene/PS nanoparticles as a template to define the position of Prussian blue product. In the first step, the templates of P4VP-stabilized polystyrene polymer nanoparticle were prepared by dispersion polymerization of styrene in methanol/water in the presence of macro-P4VP chain transfer agents. With the addition of sodium pentacyanoammineferroate(II) hydrate/[Fe(CN) 5 NH 3 ] 3− into dispersion, pyridyl moieties in P4VP in polymeric nanoparticles could react with [Fe(CN) 5 NH 3 ] 3− through a ligand exchange reaction. Subsequent metal coordination polymerization of Fe 3+ with ferrate confined within the surface of the nanoparticles led to the generation of monodispersed PB coated polymeric nanoparticles. The nanoparticles were characterized and confirmed by various modern techniques such as FT-IR, UV–Vis, TGA, XPS, TEM, SEM and AFM. The UV–Vis, FT-IR, TGA and XPS studies suggested Prussian blue was successfully coordinated with P4VP-PS polymers template according to our experimental design. The morphology studies indicated that spherical nanoparticles were obtained. In particular, the EDX mapping results clearly show that the iron element is evenly distributed on the nanoparticles. In addition, two parameters, including the amount of initiator and the amount of iron in the system, have important effects on the particle size and distribution. This experimental system we designed has great potential for the synthesis of metal containing polymeric nanoparticles with other compositions and morphologies, which offers many possibilities worthy of further exploration.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 15
·12830-12841
·
IF 2.22
Li Xiang,Zhu Yao-Feng,Meng Fan-Bin,Ni Qing-Qing
Micro-nano structure regulation of polyaniline and impedance-matching design of its composites are two crucial but challenging works in microwave absorption. In this study, an in situ sacrificial templates polymerization is applied to regulate the porous structures of polyaniline decorated on vapor-grown carbon fiber (VGCF). By manipulating porous polyaniline structures, heterogeneous interfaces, polarization centers, and geometric structures are introduced into porous VGCF@polyaniline nanohybrids. Porous VGCF@polyaniline demonstrated robust microwave absorption ability with a minimum reflection loss of − 55.9 dB at 10.3 GHz with a filler loading of 18 wt% and a thinner thickness of 1.33 mm. The investigation of the novel porous polyaniline structures and composition relationship suggest that the microwave absorption ability of porous VGCF@polyaniline is originated from the optimal impedance-matching ratio, enhanced dielectric loss, and synergistic effect, which is enhanced by conductive loss and interfacial polarization. A universal approach was proposed to address the critical issue of hybridizing porous VGCF@polyaniline with flexible polyurethane sponge as practical electromagnetic absorption structures. The hybrids exhibited interesting dual absorption properties with minimum reflection loss of − 28.8 and − 35.5 dB at frequencies of 8.5 and 8.7 GHz, respectively. This study provides a new approach for designing lightweight and practical microwave absorbers.
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高影响因子
JOURNAL OF POROUS MATERIALS
·
2020
·Vol. 27
·期 4
·1179-1190
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IF 2.183
Wang Hongning,Yang Qinqin,Zhang Zhihui,Song Fujiao,Zhong Jing,Huang Weiqiu,Chen Ruoyu
Organosiliceous nanotubes (OSNs) have been successfully prepared by a reverse micelle, then coated with mixed silica sources of tetraethylorthosilicate (TEOS) and 1,2-bis(triethoxysilyl)ethane, (BTSE). The OSNs were analyzed with different apparatuses and used for volatile organic compounds (VOCs) removal. The static pentane, hexane, benzene, toluene, 92# gasoline and water adsorption behaviors on OSNs and marketable activated carbon (AC) and silica gel (SG) were explored. Experimental results showed that the OSN-35% sample (mass ratio BTSE to (BTSE + TEOS) of 35% in feeding process) was uniform nanotubes with the biggest aspect ratio and pore volume had the best static VOCs adsorption capacity (1.35 g g − 1 , pentane , 1.63 g g − 1 , hexane , 1.68 g g − 1 , benzene , 1.83 g g − 1 , toluene and 0.973 g g − 1 , oil vapor , respectively) and 0.247 g g − 1 , water (the smallest). The dynamic monocomponent n-hexane and toluene adsorption performance on OSN-35% was evaluated via breakthrough curves, and the experimental results showed that OSN-35% had longer breakthrough times ( t b s) and higher adsorption capacities compared with commercial adsorbents, and OSN-35% is water resistant under wet condition. For binary component (n-hexane and toluene) adsorption, the OSN-35% preferred to adsorb toluene. The larger VOCs capacity of OSNs was co-influenced by the introduction of organic groups, aspect ratio and pore volume. The OSNs with enhanced hydrophobicity and VOCs adsorption behaviors and excellent stability are potential for VOCs adsorption application.
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高影响因子
Nano Research
·
2020
·Vol. 13
·期 4
·1029-1034
·
IF 8.183
He Dafang,Yang Yi,Liu Zhenmin,Shao Jin,Wu Jian,Wang Shun,Shen Liming,Bao Ningzhong
An ordered hollow MoS 2 nanocages/RGO nanocomposite is constructed by a simple solvothermal-assisted assembly method combined with freeze-drying and annealing. In this novel nanostructure, hollow MoS 2 nanocages are homogeneously distributed on graphene sheets with a tight bond of C-O-Mo. The nanosized and hollow MoS 2 nanocages can effectively accommodate the huge volume change during charge/discharge process and increase the number of electrochemical reaction active sites, accelerating the kinetics of lithiation/delithiation. The tight C-O-Mo bond between graphene and MoS 2 further reinforces the structural stability, thus improve the electrical conductivity and substantially enhance the lithium storage performance of MoS 2 anode material. As a result, this novel nanocomposite shows a long-cycle stability of 717.4 mAhg −1 after 800 cycles at a high current density of 3 Ag −1 , exhibiting great potential as an anode nanocomposite for advanced lithiumion batteries.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2020
·Vol. 55
·期 15
·6669-6677
·
IF 3.553
Li Wan
Hydrogels as drug carriers for delivery of antibiotics are rarely derived from natural molecules and often require complicated synthesis. Puerarin is an herbal natural product that can self-assemble to form pH-sensitive hydrogels without any structural modification. However, Puerarin hydrogels have poor thermostability and weak mechanical strength. In this work, we prepared N -(9-fluorenylmethoxycarbonyl)- l -phenylalanine (Fmoc–Phe–OH) nanofiber-reinforced Puerarin hydrogels with good mechanical and antibacterial properties for suitable drug carriers. The phase transition temperature of Puerarin hydrogels can be increased from 35 to 55 °C by adding only 6 mg/mL of Fmoc–Phe–OH. Rheological study indicated that the presence of Fmoc–Phe–OH not only increased the storage modulus of Puerarin hydrogels by five times, but also did not affect their pH sensitivity. SEM study and pore analysis indicated that Fmoc–Phe–OH nanofibers intertwined with the Puerarin assembly, leading to enhancement of mechanical property of hydrogel. Antibacterial test indicated that the reinforced Puerarin hydrogels have antibacterial property compared with Puerarin hydrogels. Based on these features, a controllable release of loaded model drug (berberine hydrochloride) can be realized from the reinforced Puerarin hydrogels, showing a good synergistic antimicrobial effect on the S. aureus .
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高影响因子
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
·
2020
·Vol. 94
·期 2
·416-424
·
IF 2.008
Tian Wei,Du Bin,Shui Anze,Ke Shanjun,Shan Qingliang,He Chao,Ma Juan
In this work, a silica-based mesoporous oxide (SMO) was directly fabricated via a template-free method using the abundant and inexpensive volcanic ash as raw material. By alkali hydrothermal activation and acid hydrothermal etching of volcanic ash, the SMO with large mesopore size (7.94 nm), high specific surface area (459.5 m 2 /g), and total pore volume of 1.05 cm 3 /g was produced. The main ingredient of SMO is amorphous microporous silica. The structural evolutions of the mesoporous materials were revealed by X-ray powder diffraction, scanning electron microscope, Fourier transform infrared spectrometry, N 2 adsorption/desorption, and transmission electron microscopy techniques. The as-prepared SMO possessed excellent adsorption of water vapor as high as 616.0 g/m 2 at the relative humidity ranging from 33 to 75%. This SMO provides a platform for preparing high performance template-freely humidity self-regulating material.
This figure shows that silica-based mesoporous oxide (SMO) quickly adsorbs moisture at RH = 75% and reaches to 616.0 g/m 2 , and then the adsorbed water releases at 33% RH. These results suggest SMO have an excellent humidity self-regulating function in the RH ranging from 33 to 75%.
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高影响因子
SN Applied Sciences
·
2020
·Vol. 2
·期 3
·1-10
·
IF 0
Guo Liulong,Yan Hongxia,Chen Zhengyan,Lv Qing,Bai Tian,Zhang Yuanbo
A novel hyperbranched polysiloxane functionalized graphene oxide (HPBSi-GO) containing abundant primary amine, tertiary amine and hydroxyl groups was designed and successfully synthesized though efficient “grafting to” method. The as-synthesized HBPSi-GO was confirmed by FT-IR, XPS and AFM. Moreover, the HPBSi-GO was incorporated into epoxy (EP) resin matrix to fabricate HPBSi-GO/EP composites. The results showed that the HPBSi-GO has better dispersibility than that of unmodified GO in EP matrix. Interestingly, the mechanical and frictional properties of HPBSi-GO/EP composites were simultaneously superior to those of neat epoxy resin. AFM and TOM results revealed that the good properties mainly attributed to the unique inorganic–organic structure of HBPSi-GO, as well as the good interfacial adhesion between HBPSi-GO and EP matrix.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 38
·期 12
·1345-1354
·
IF 3.154
Liu Fu-Lin,He Jian-Jun,Yang Hai-Xia,Yang Shi-Yong
A convenient tape-casting method was applied to prepare high performance aromatic polyamide (PA) films based on Technora®. During the polycondensation, CaO was introduced to improve the solubility of the PA resin, and the generated halides were totally removed from the film via a simple water bath, without leaving any defects in PA films. The factors of processing temperature and immersion time had been systematically investigated, and the experimental results demonstrated that both of them had impressive impacts on aggregation state and comprehensive properties of the PA film. It was suggested that immersion in water for more than 1 min and baking below 300 °C for 10 min were the optimal conditions for the thermal, tensile, tear, and optical properties to be in the best equilibrium. The resultant PA films integrated outstanding film-forming ability and excellent general performance, especially the tensile property and tear resistance.
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高影响因子
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