CELLULOSE
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2019
·Vol. 26
·期 8
·4815-4825
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IF 3.917
Yang Xixian,Li Shijie,Zhang Shiyi,Chen Xin,Peng Shuai
Abstract Commonly used nanocarbon composite materials are routinely synthesized from petroleum-based resources. To avoid their bad impact on the environment, using cellulose-based materials as the promising resources is a better choice due to its easy acquisition and rich reserves. In this study, microcrystalline cellulose was selected as the carbon precursor to synthesize novel cellulose-derived 3D-graphene/LiOH·H 2 O nanomaterials for chemical heat storage to improve the efficiency of thermal energy utilization. The characterization and performance test results show that LiOH·H 2 O particles (5–20 nm) were highly dispersed on the 3D graphene carbon skeleton. These materials had excellent heat storage densities and thermal conductivities due to a completely new, hydrophilic, nano-reactive interface on 3D graphene. Among the materials, 3D-GF-VC-LiOH·H 2 O (Ascorbic acid-modified 3D-graphene/LiOH·H 2 O) exhibited the best heat storage and thermal conductivity properties. It achieved a thermal conductivity of 2.6 W/m K, which was 1.5 times that obtained with pure LiOH·H 2 O, and its heat storage density (2157 kJ/kg) was 3.3 times that of pure LiOH·H 2 O (661 kJ/kg). The activation energy could decrease to 27.5 kJ/mol. Moreover, the heat storage temperature range of LiOH·H 2 O was clearly expanded by introduction of 3D graphene. Hence, the addition of cellulose-derived 3D graphene is a very efficient means by which the design of chemical heat storage materials can be improved. Graphical abstract
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2019
·Vol. 297
·期 5
·705-717
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IF 1.906
Yan Qing,Liu Lulu,Wang Ting,Wang Henan
An interpenetrating double network hydrogel based on cellulose backbone and poly-dopamine dendritic structure was successfully prepared with the advantages of controlled hydrophobic drug loading, pH-responsive ability, and long-term bacteriostatic property. 13 C-NMR was used to process the structural characterization and explain the mechanism of hydrogel system’s construction. Hydrophobic drug of ciprofloxacin with carbonyl group can evenly carry in the hydrogel system, and the highest loaded ratio of ciprofloxacin was reach to 80.56%. Besides, the swelling property and the controlled drug loading ability of our prepared hydrogel were carefully studied, which showed a close relation with the hydrogel design. Moreover, the in vitro drug release experiments demonstrated that the hydrogel had an obvious pH-responsive release property of ciprofloxacin, and the result of bacteriostatic experiment also showed a long-term bacteriostatic effect on Escherichia coli , which showed potential application on biological and medical fields, including wound treatment.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 10
·7651-7664
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IF 3.442
Tian Chenfeng,Yuan Li,Liang Guozheng,Gu Aijuan
High thermal conductivity and high flame retardancy become necessary properties of thermally resistant thermosetting resins for many cutting-edge fields. However, building a phosphorus-free sustainable strategy is still a challenge; besides, sometimes high thermal conductivity and flame retardancy could not be simultaneously achieved, while sometimes they promote to each other, and no report focuses on explicating their relationship and mechanism. Herein, new resins with high thermal conductivity and greatly improved flame retardancy are developed through building phosphorus-free cross-linked network with three-dimensional porous framework based on boron nitride (BN) skeleton (sBN) and bismaleimide resin (BD). With the same loading of BN, sBN/BD has much higher thermal conductivity than the composite based on BN powders (BN/BD). For composites with 12.53 wt% of fillers (sBN or BN powders), the thermal conductivity of 5sBN/BD reaches 1.53 Wm −1 K −1 , about 2.4 and 9.4 times of those of 5BN/BD and BD resin, respectively. The exploring relationship between flame retardancy and thermal conductivity shows that sBN/BD composites are somewhat easier to be ignited, and the flame propagation is faster, but under continuous heating, sBN/BD has much weaker burn strength and fewer smoke releasing compared with BN/BD. 5sBN/BD has about 51.9%, 47.5%, 42.5% and 54.8% lower peak heat release rate, total smoke release, specific extinction area and maximum smoke density than BD resin, respectively. The mechanism behind these interesting results is intensively discussed.
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高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2019
·Vol. 26
·期 9
·8768-8778
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IF 2.914
Sun Yufeng,Liu Zongtang,Fei Zhenghao,Li Changshun,Chun Yuan,Zhang Aimin
Fe-Ni bimetallic nanoparticles supported on CNTs (Fe-Ni/CNTs) were synthesized, characterized, and applied for removal of 2,4-dichlorophenol (2,4-DCP) in aqueous solution. The removal performance was enhanced drastically on Fe-Ni/CNTs with respect to monometallic Fe/CNTs. The synergistic effect between Fe-Ni nanoparticles and CNTs has been studied in detail. The research results indicated that the doping of Ni played an important role in promoting the catalytic degradation of 2,4-DCP. And the presence of CNTs not only could effectively reduce the aggregation of nanoparticles but also facilitate the mass transfer of 2,4-DCP and the formation of active atomic hydrogen during the catalytic process. In addition, the removal kinetics of 2,4-DCP by Fe-Ni/CNTs were in agreement with a pseudo-first-order model, and the rate constants were dependent on a number of factors including the initial concentration of 2,4-DCP, the dosage of Fe-Ni/CNTs, pH value of the solution, and doping amount of Ni. The degradation mechanism involved the adsorption by CNTs and catalytic reduction by Fe under the stimulating of Ni, and the preferred dechlorination followed the order of para-Cl > ortho-Cl. The study confirmed that Fe-Ni/CNTs had a potential to be a promising catalytic material for removal of chlorophenol and had a great prospect for practical application.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
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2019
·Vol. 54
·期 21
·13848-13862
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IF 3.442
Qiu Xiaoqing,Kundu Chanchal Kumar,Li Zhiwei,Li Xiaohong,Zhang Zhijun
An environmentally friendly chemical method was used to reduce the graphene oxide (GO) and subsequently, noncovalent functionalization of the GO with dopamine hydrochloride was carried out via self-polymerization reaction under a weak alkaline condition. The as-prepared nanocomposite was donated as PDA-rGO and later on, flame-retardant coatings were developed into the flexible polyurethane foams (FPUFs) surfaces using polyacrylic acid, and polyethyleneimine along with PDA-rGO via layer-by-layer assembly. The growth process of the deposited coatings was tailored by altering the pH and concentration of the PDA-rGO suspension. Cone calorimeter test results indicated that PDA-rGO-based coating with three tri-layer deposition effectively reduced the peak heat release rate by 49.3%, the total smoke release by 33.1%, and the peak of release for the production of CO by 46.2% compared to the neat FPUF, which could be attributed to the physical barrier effect of rGO sheets and the free-radical scavenging property of polydopamine.
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高影响因子
POLYMER BULLETIN
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2019
·Vol. 77
·期 6
·2873-2887
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IF 1.858
Huang Aimin,Wei Liping,Zhao Zengyan,Wei Guodong,Zhang Yanjuan,Huang Zuqiang,Li Xuanhai,Hu Huayu,Qin Xingzhen,Yang Mei
A simple, green, and efficient mechanical activation-assisted esterification (MAE) technology was developed for the preparation of cellulose acetate butyrate (CAB), which was used as film-former for pearlescent coating. In addition, CAB was also prepared by a traditional liquid phase esterification (LPE) method for comparing the structures and characteristics of the CABs prepared by these two technologies. 1 H and 13 C NMR confirmed that CAB was successfully produced, and the degree of substitution of acetyl and butyryl groups was also calculated. The crystal structure and molar mass of the CABs prepared by MAE and LPE methods were dissimilar, ascribing to different reaction systems and characteristics. FTIR, SEM, and transparency analyses were used to investigate the chemical structure and surface characteristics of CAB films, and appearance, glossiness, rub resistance, and ethanol resistance measurements were carried out to investigate the surface and wear characteristics of CAB/pearlescent coating films. The results indicated that the surface and wear characteristics of the films based on MAE- and LPE-prepared CABs were similar to the same reaction time, and the interfacial adhesion and compatibility among components significantly affected the characteristics of the films.
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高影响因子
CHEMICAL PAPERS
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2019
·Vol. 73
·期 7
·1753-1759
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IF 1.246
Xu Li,Zhang Ya-Nan,Ji Xing-Hu,He Zhi-Ke
Silicon nanodots (SiNDs) as an excellent fluorescent nanomaterial have got more and more applications. In this work, the terbium-modified silicon nanodots (SiNDs-Tb) were synthesized and successfully applied to the detection of dipicolinic acid (DPA), a biomarker of anthrax spores. Here, SiNDs serve as scaffolds and a fluorescence reference ( F 445 ), coordinating with Tb 3+ ions, while terbium ions as specific recognition elements and response signals ( F 490 and F 547 ) with zero background fluorescence. The sensing process was easily operated in aqueous media and can be finished in a short time. With a concentration range of 0.2–10 μM of DPA, the fluorescence intensity ratio ( F 547 / F 445 ) correspondingly generated quantitative changes and the limit of detection was 24 nM. It is a rapid and sensitive sensing system and provides a new approach for full exploitation of SiNDs in fluorescence assay.
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高影响因子
Scientific Reports
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2019
·Vol. 9
·期 1
·1-10
·
IF 4.011
Zhang Xingyuan,Guo Zhao,Zhang Xiao,Gong Linji,Dong Xinghua,Fu Yanyan,Wang Qing,Gu Zhanjun
Developing robust and high-efficient synthesis approaches has significant importance for the expanded applications of upconversion nanoparticles (UCNPs). Here, we report a high-throughput synthesis strategy to fabricate water-dispersible core-shell structured UCNPs. Firstly, we successfully obtain more than 10 grams core UCNPs with high quality from one-pot reaction using liquid rare-earth precursors. Afterwards, different core-shell structured UCNPs are fabricated by successive layer-by-layer strategy to get enhanced fluorescence property. Finally, the hydrophobic UCNPs are modified with poly(ethylene glycol) monooleate (PEG-OA) though a novel physical grinding method. On the basis of mass-production, we use the as-prepared PEG-UCNPs to construct an 808-nm stimuli photodynamic therapy agent, and apply them in cancer therapy and bio-imaging.
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PubMed
高影响因子
JOURNAL OF MOLECULAR NEUROSCIENCE
·
2019
·Vol. 68
·期 2
·181-190
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IF 2.577
Yan Penghui,Wu Xuejian,Liu Xiaokang,Cai Yingchun,Shao Chenglong,Zhu Guangduo
Microglial activation and inflammatory response played an important role in the secondary injury of spinal cord injury (SCI). Several microRNAs were associated with this procedure, but the underlying molecular mechanism was poorly understood. Sprague-Dawley (SD) rats were divided into four groups: SCI group ( n = 7), agomiR-325-3p group ( n = 7), and their control groups. Expression of miR-325-3p and proteins in epidermal growth factor receptor (EGFR)/mitogen-activated protein kinase (MAPK) signaling pathway was evaluated in microglia from SCI rats and primary microglia/BV2 cells activated by lipopolysaccharide (LPS). Concentrations of interleukin-1β (IL-1β) and tumor necrosis factor α (TNF-α) in supernatants were measured by ELISA. Low expression of miR-325-3p and activation of EGFR/MAPK was observed in microglia of SCI and LPS-induced primary microglia. Overexpression of miR-325-3p in LPS-induced BV2 cells inhibited microglial activation and release of TNF-α and IL-1β. Luciferase reporter assay confirmed that miR-325-3p negatively regulated EGFR by targeting its 3′-untranslated regions. Additionally, agomiR-325-3p inhibited the activation of microglia and EGFR/MAPK, alleviating the inflammatory response. These results indicated that miR-325-3p attenuated secondary injury after SCI through inhibition of EGFR/MAPK signaling pathway, the microglial activation, and the release of inflammatory cytokines, suggesting that miR-325-3p may be employed as a therapeutic target for SCI.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2019
·Vol. 297
·期 10
·1301-1311
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IF 1.906
Liu Pin,Qi Chenze,Gao Yong
Colloidosomes have gained intensive attention in the past years due to their substantial applications in wide scopes involving encapsulation, catalysis, and drug delivery, etc. In this study, we depicted the templated fabrication of well-shaped colloidosomes with tunable shell thickness by Pickering emulsion at a mild condition. To this end, toluene-in-water Pickering emulsion stabilized by cetyltrimethylammonium bromide (CTAB)–modified polydopamine (PDA) nanoparticles (PDA@CTAB) was prepared. After the covalent cross-linking of PDA nanoparticles assembled on the surface of an oil droplet through chemical reactions occurring in toluene phase, exclusive intra-colloidosomes were afforded. The shell thickness of colloidsomes could be roughly tuned by the adjustment of the amount of the reactive monomers in the oil phase. Our investigations revealed that CTAB was critical for the successful fabrication of well-shaped colloidosomes. Otherwise, only irregular structures were obtained if pristine PDA–stabilized Pickering emulsion was applied. The current strategy could enable hydrophobic cargo, such as 10-hydroxycamptothecin to be encapsulated while colloidosomes were created. The release behavior of the encapsulated cargoes was also investigated.
CTAB was necessary for the templated fabrication of well-shaped colloidosomes by PDA-stabilized oil-in-water Pickering emulsion
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高影响因子
APPLIED BIOCHEMISTRY AND BIOTECHNOLOGY
·
2019
·Vol. 190
·期 2
·475-486
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IF 2.14
Liu Yuting,Zong Shuai,Li Jinglei
ZnO and ZnO nanoparticles (ZnO NPs) are widely used in food packaging, food preservation, cosmetic preparation, and animal feed. ZnO is alleged showing multiple bioactivities including antimicrobial and anti-inflammation. It is hypothesized in this study that bulk ZnO and ZnO NPs could attenuate symptoms associated with high-fat-diet–induced obesity. Bulk ZnO and ZnO NPs with diameters of 30 and 90 nm were administered to high-fat-diet (HFD)–induced obese mice. Body weight, liver and fat tissue indices of ZnO-treated mice were decreased compared with those of obese mice (MOD). Blood glucose levels in oral glucose tolerant test and insulin tolerant test of ZnO-treated mice were lower than those of MOD. Serum lipid profile of ZnO-treated mice was ameliorated with lower total cholesterol, total triglyceride, and low-density lipoprotein cholesterol levels compared with that of MOD. In addition, the levels of serum IL-1β and LPS-binding protein were also decreased by ZnO treatment. Both bulk and nanosized ZnO could attenuate HFD-induced phenotypes related with obesity, but ZnO NP is more efficient to lower the fat index and bulk ZnO is better to restore the disturbed serum lipid profile.
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高影响因子
CELLULOSE
·
2019
·Vol. 26
·期 10
·5995-6007
·
IF 3.917
Chen Zhiliang,Yu Weidong,Du Zhaoqun
Abstract In this study, cotton fabrics were reported to be typically functionalized by loading silver nanowires (AgNW) on the surface of the polydopamine modified cotton fabric. Firstly, AgNW were prepared by a polyol method and then a polydopamine-modified cotton fabric was prepared by being immersed in AgNW dispersion by the dip-coating method. The resulting silver nanowire/polydopamine/cotton-based nanocomposites (APCN) has a surface specific resistance as low as 2.4 Ω and has good durability and flexibility. In addition, the electrothermal properties of APCN were investigated by applied voltage. The result showed that the composite material can reach 80 °C in a short time under the voltage of 1.8 V, and conform to the power balance model. The steady-state temperature of the composite material is closely related to the voltage, and has a quadratic relationship with the voltage and expresses linear relation with the electric power. Graphical abstract
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危险品化学品经营许可证（带存储）