JOURNAL OF MATERIALS SCIENCE
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2020
·Vol. 55
·期 26
·12091-12102
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IF 3.553
Sheng Peng,Tao Shi,Gao Xiaorui,Tan Yongjian,Wu Dajun,Qian Bin,Chu Paul K.
Cobalt carbonate hydroxide possesses interesting capacitive properties due to the unique crystal structure. Herein, the hierarchical Co 3 O 4 @Co 2 (CO 3 )(OH) 2 dendritic structure was fabricated on carbon cloth with Co 3 O 4 nanoneedles as the inner core to enhance the conductivity. The loading efficiency of Co 2 (CO 3 )(OH) 2 nanowhiskers had improved obviously, and the nanowires provided more electrochemical sites to facilitate the superior electrochemical energy storage capacity of supercapacitor. The dendritic electrode with the core–shell structure had a high area-specific capacitance (1541 mF cm −2 at 1 mA cm −2 ), good rate capacitance (only 18.1% specific capacitance lost when the current density increased to 5 mA cm −2 ), as well as better electrochemical cycle stability (a capacitance retention of 72.1% after 5000 cycles at a high current density of 5 mA cm −2 ). The dendritic Co 3 O 4 @Co 2 (CO 3 )(OH) 2 and activated carbon as cathode and anode, respectively, were used to assemble an asymmetric supercapacitor, possessing the better area-specific capacitance of 87 mF cm −2 as well as well-deserved longevity retaining approximately 97.3% of initial capacitance even after 10,000 cycles at 1 mA cm −2 . The excellent properties stemmed from electro-active sites galore, strong adhesion between the core and shell, superior conductivity, as well as excellent ion transfer. The novel materials and feasible strategy are promising for next-generation hybrid supercapacitor with high performance.
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高影响因子
Journal of Advanced Ceramics
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2020
·Vol. 9
·期 4
·471-480
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IF 2.889
Huang Fangyi,Su Hua,Li Yuanxun,Zhang Huaiwu,Tang Xiaoli
In this study, low-temperature fired CaMg 1− x Li 2 x Si 2 O 6 microwave dielectric ceramics were prepared via the traditional solid-state reaction method. In this process, 0.4 wt% Li 2 CO 3 -B 2 O 3 -SiO 2 -CaCO 3 -Al 2 O 3 (LBSCA) glass was added as a sintering aid. The results showed that ceramics consisted of CaMgSi 2 O 6 as the main phase. The second phases were CaSiO 3 always existing and Li 2 SiO 3 occurring at substitution content x > 0.05. Li + substitution effectively lowered sintering temperature due to 0.4 wt% LBSCA and contributed to grain densification, and the most homogeneous morphology could be observed at x = 0.05. The effects of relative density, the second phase, and ionic polarizability on dielectric constant (ε r ) were investigated. The quality factor ( Q × f ) varied with packing fraction that concerned the second phase. Moreover, the temperature coefficient of the resonant frequency (τ f ) was influenced by MgO 6 octahedral distortion and bond valence. Excellent dielectric properties of the CaMg 1− x Li 2 x Si 2 O 6 ceramic was exhibited at x = 0.05 with ε r = 7.44, Q × f = 41,017 GHz ( f = 15.1638 GHz), and τ f = −59.3 ppm/°C when sintered at 900 °C. It had a good application prospect in the field of low-temperature co-fired ceramic (LTCC) substrate and devices.
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JOURNAL OF NANOPARTICLE RESEARCH
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2020
·Vol. 22
·期 6
·1-11
·
IF 2.132
Sun Tingting,Liang Huazhe,Liu Shaojie,Tang Erjun,Fu Cuiyan
Magnetic nanoparticles (MNPs) modified by polyamidoamine (PAMAM)-immobilized 2,2,6,6-tetramethyl-1-piperidinyl-oxyl (TEMPO) as recoverable catalysts for catalytic oxidation of polyethylene glycol were designed and prepared, which were expected to combine the advantages of easy recovery of MNPs and high activity of PAMAM-immobilized TEMPO. The catalysts of MNPs modified by PAMAM-immobilized TEMPO (MNPs-PAMAM-T) were characterized by Fourier transform infrared spectroscopy (FT-IR), thermal gravimetric analyzer (TGA), and transmission electron microscopy (TEM). The mean particle size of MNPs was about 10 nm. MNPs-PAMAM-T/NaBr/NaClO was used as catalytic system for catalytic oxidation of monomethoxy poly (ethylene glycol). The catalytic performances were affected by the loading amounts of TEMPO and PAMAM generations. It was shown that the catalyst with TEMPO loading of 5.198 mmol/g using G2.0 PAMAM-modified MNPs as carrier had the best catalytic performance, which could be up to 94% of the free TEMPO level. The efficient recovery of catalyst could be achieved by magnetic separation and the recycling performance was good.
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高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 12
·7283-7296
·
IF 4.21
Lu Ruiyang,Yu Yucong,Adkhamjon Gafurov,Gong Wenli,Sun Xiaoqing,Liu Lin
Abstract In this paper, a facile and efficient approach to robust and durable superhydrophobic cotton fabric was presented via in situ CuO deposition and stearic acid (STA) coating. The combined effects of both rough structure and low surface energy endowed cotton fabric (Cot) with superhydrophobicity, water repellency, and self-cleaning property. Moreover, the as-prepared fabric (Cot–CuO–STA) could keep its robust superhydrophobicity under harsh environmental conditions of acidic, alkaline and salt solutions, high temperature, mechanical abrasion and washing. Importantly, the obtained Cot–CuO–STA with WCA of 156.5° had great potential in oil/water separation with high separation efficiency of up to 98.7% for various oils (dichloromethane, trichloromethane, soybean oil, and n-heptane). Further, fascinating permeate flux (more than 1800 L.m −2 .h −1 ) and remarkable recyclability made Cot–CuO–STA a promising application in oil-contaminated water treatment and marine spilt oil cleanup. Graphic abstract Robust and durable superhydrophobic cotton fabric was fabricated for oil/water separation via a facile and efficient route. The resultant fabric exhibited remarkable separation efficiency for different kinds of oils, fascinating permeate flux, and excellent recyclability.
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Journal of Coatings Technology and Research
·
2020
·Vol. 17
·期 5
·1377-1387
·
IF 1.815
Peng Xiaoxiao,Liu Yan,Xin Binjie,Guo Hengyi,Yu Yunge
Intended for preparing silane-modified waterborne polyurethane dispersions and then applying them to the development of environmentally friendly nail enamels, the synthesis mechanism was investigated in this paper to determine the optimal technological parameters. Aimed at the synthesis of waterborne polyurethane dispersions, a one-step method was conducted on the prepolymers and the main raw materials, isophorone diisocyanate (IPDI), polycaprolactone diol (PCL), 1,4-butanediol (BDO), 2,2-dimethylol butyric acid (DMBA), (3-aminopropyl) triethoxysilane (APTES), triethylamine (TEA) and solvent water, were adopted. Subsequently, the water-based nail enamel together with its dry film was prepared by pigments and functional additives. Morphological characteristics and chemical composition of dry film of nail enamel were characterized by using atomic force microscopy (AFM) and Fourier transform infrared spectroscopy (FTIR). The crystallinity of film was analyzed by an X-ray diffractometer (XRD). Benefiting from a thermogravimetric analyzer (TG) and differential thermal analyzer (DSC), the thermal properties of the prepared film were characterized. The hardness, adhesion, glossiness, water absorption, drying time and some other indicators of the water-based nail enamel were tested using a loading pencil hardness tester and other equipment. The experimental results showed the waterborne polyurethane modified by silane coupling agent exhibited favorable film-forming property, glossiness, flexibility, hardness, and adhesion and can be used for developing the environmentally friendly water-based nail enamel with a concentration of silane coupling agent of 1.5%, showing a broad market prospect in the cosmetics field.
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Biomass Conversion and Biorefinery
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2020
·Vol. 12
·期 6
·2267-2275
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IF 2.602
Zhang Dongqiang,Chen Xiangyun,Yuan Bing,Yu Fengli,Xie Congxia,Yu Shitao
Hydration of α-pinene catalyzed by a natural deep eutectic solvent (NADES) prepared by oxalic acid dihydrate (OA·2H 2 O) and betaine (Bet), 2.7OA·2H 2 O/Bet, has been studied to develop a more economical and green process for one-step hydration method. It has been found that a homogeneous ternary DES system could be established with OA·2H 2 O and Bet in a simple, convenient, and atomic economy way. Fourier transform infrared spectrum (FT-IR), proton nuclear magnetic resonance ( 1 H NMR), thermogravimetry (TG), and differential scanning calorimetry (DSC) have been applied to confirm the formation of hydrogen bonding between OA, H 2 O, and Bet. With the consideration of catalytic activity, selectivity, and ability to recycle, 2.7OA·2H 2 O/Bet has been screened out to be a promising catalyst for hydration of α-pinene due to its appropriate acidic properties and solubility. In this catalytic system of hydration, water, as one of the reactants, both assisted in the formation of DES and acted as the dispersing agent. Correspondingly, an “emulsifying reaction at the reaction temperature and solid-liquid separation below room temperature” characteristic of this specific catalytic hydration of α-pinene has been achieved.
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高影响因子
AAPS PHARMSCITECH
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2020
·Vol. 21
·期 7
·1-14
·
IF 2.401
Tian Rui,Wang Hui,Xiao Yi,Hu Pengyue,Du Ruofei,Shi Xiufeng,Wang Zhengtao,Xie Yan
The aim of this work was to increase the solubility and oral bioavailability of isorhamnetin, kaempferol, and quercetin in the total flavones of Hippophae rhamnoides L. (TFH) by preparing their nanosuspensions (NSs) and an inclusion complex. Based on the particle size and zeta potential, P407, Soluplus, SDS, PEG-6000, and HP-β-CD were selected as stabilizers. TFH NSs and a TFH/HP-β-CD inclusion complex were prepared, and their morphology, crystallinity, molecular interactions, and cytotoxicity were investigated. Furthermore, the saturation solubility, dissolution, and pharmacokinetics of the three flavonoids in the TFH, TFH NSs, and TFH/HP-β-CD inclusion complex were compared. The five obtained TFH NSs were physically stable, and their particle sizes were all below 200 nm. The solubility and dissolution of the three active components were obviously enhanced by the formation of the TFH NSs and TFH/HP-β-CD inclusion complex. Correspondingly, the oral bioavailability of isorhamnetin, kaempferol, and quercetin increased up to 4.11-, 3.85-, and 6.73-fold, respectively, in the TFH NSs and 2.89-, 3.71-, and 9.51-fold, respectively, in the TFH/HP-β-CD inclusion complexes compared to those in the raw TFH. In brief, both NSs and inclusion complexes can improve the oral bioavailability of the three flavonoids in TFH. Taking the drug loading and the stable ratio of the multiple components into consideration, the NSs is a more promising strategy than the inclusion complex for increasing the oral bioavailability of multiple water-insoluble components in herbal extracts.
Graphical abstract
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PubMed
高影响因子
Science China-Chemistry
·
2020
·Vol. 63
·期 10
·1507-1514
·
IF 6.356
Yin Kun,Zeng Xi,Liang Xuan,Wei Haopai,Zeng Huimin,Qi Wei,Ruan Weidong,Song Yanling,Yang Chaoyong,Zhu Zhi
Droplet microfluidics is a powerful platform for high-throughput single-molecule protein analysis. However, the issues of coalescence and crosstalk of droplets compromise the accuracy of detection and hinder its wide application. To address these limitations, a novel colloidosome-based method was presented by combining a Pickering emulsion with droplet microfluidics for single-molecule protein analysis. Utilizing the self-assembly of easily synthesized colloidal surfactant F-SiO 2 NPs at the water/oil interface, the colloidosomes are rigidly stabilized and can effectively avoid the leakage of fluorescent molecules. The crosstalk-free colloidosomes enable high-throughput single-molecule protein analysis, including heterogenous dynamic studies and digital detection. As a robust and accurate method, colloidosome-based microfluidics is promising as a powerful tool for a wide variety of applications, such as directed enzyme evolution, digital enzyme-linked immunosorbent assay (ELISA), and screening of antibiotics.
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高影响因子
BMC Complementary Medicine and Therapies
·
2020
·Vol. 20
·期 1
·1-10
·
IF 0
Liu Shou Gang,Luo Guang Pu,Qu Yong Bin,Chen Yong Feng
Background Psoriasis is a common inflammatory skin disease. Abnormal proliferation of keratinocytes is one of the psoriatic histopathological features. Indirubin has an essential effect on the proliferation and activation of keratinocytes; however, in psoriasis, the specific mechanism of action of indirubin on keratinocytes is unclear. In the present study, we revealed the effects of indirubin on DNA methyltransferase 1 (DNMT1), wnt inhibitory factor 1 (wif-1), and wnt/β-catenin signal pathway, in the meantime, we explored the effects of indirubin on proliferation, cell cycle and the apoptosis of HaCaT cells.Methods The expression of DNMT1, wif-1, Frizzled2, Frizzled5, and β-catenin in HaCaT cells treated with different concentrations of indirubin were detected by Western blotting and quantitative real-time polymerase chain reaction (qRT-PCR). The expression levels of DNMT1 and wif-1 were observed after treated with different concentrations of indirubin by enzyme-linked immunosorbent assay (ELISA). The wif-1 promoter methylation status was detected by DNA methylation-specific PCR (MSP). The transcriptional activities of wif-1 and β-catenin were discovered by a luciferase reporter gene system. Cell viability was determined by Cell Counting Kit-8 (CCK8) method. The cell cycle was detected by flow cytometry. The apoptotic cells were surveyed by the apoptosis kit. The expression of Inolucrin, Loricrin, Filaggrin, Keratin 17, and transcriptional activation of transglutaminase 1(TGase1) were detected by Western blotting.Results Indirubin inhibited the expression of DNMT1 and the methylation of the wif-1 promoter. In the wnt signal pathway, indirubin restored the protein expression of wif-1 and inhibited expression of Frizzled2, Frizzled5, and β-catenin. Besides, indirubin inhibited the proliferation of HaCaT cells, induced apoptosis, and arrest cell cycle. We also reported that indirubin could down-regulate the expression of Involucrin, TGase 1, and keratin 17, but the expression of Filaggrin and Loricrin had no significant effect.Conclusion Our research showed that indirubin promoted the demethylation of wif-1 and suppressed the wnt/β-catenin signal pathway, thereby exerted an anti-proliferative effect. This study reveals the anti-proliferation mechanism of indirubin, which may provide an effective option for the treatment of proliferative diseases.
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PubMed
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2020
·Vol. 31
·期 17
·14977-14985
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IF 2.22
Luo Wenjie,Wang Jie,Zhang Zhen,Lu Donglin,Yu Yang,Ji Yuan,Qiao Hui,Qi Xiang,Liu Yundan
The development of effective but earth-abundant electrocatalysts for hydrogen evolution is still a great challenge. Non-noble metal-based multi-phase nanocomposites are regarded as emerging catalysts for efficient catalysts, but their practical application is still hindered by the lack of both satisfying activity and cost-effective synthesis. In this work, ternary CoSe 2 /MoO 2 /MoSe 2 nanocomposites with controllable phases have been successfully synthesized by simply direct selenization of cobalt molybdate (CoMoO 4 ) nanorods. Compared with related pure Mo-based and Co-based counterparts, the electric conductivity and the active sites of the as-prepared ternary nanocomposites have been both increased due to the synergistic effects. The as-prepared ternary CoSe 2 /MoO 2 /MoSe 2 nanocomposites electrocatalysts demonstrated superior HER performance which only requiring an overpotential of 229 mV for reaching 10 mA/cm 2 current density in acidic media.
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高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 7
·1-12
·
IF 6.232
Kalambate Pramod K.,Dhanjai,Sinha Ankita,Li Yankai,Shen Yue,Huang Yunhui
New multi-walled carbon nanotubes supported on Ti 3 C 2 –MXene and chitosan (chit) composite film–based electrochemical sensor for ifosfamide (IFO), acetaminophen (ACOP), domperidone (DOM), and sumatriptan (SUM) have been developed. Ti 3 C 2 –MXene was synthesized by a fluoride method. Structural and chemical characterizations suggested the successful preparation of Ti 3 C 2 –MXene with clearly seen layered morphology, defined 0 0 2 diffraction peak at 7.5° and complete absence of 1 0 4 plane at 39°. The electrochemical performance of the sensor was investigated by cyclic voltammetry and adsorptive stripping differential pulse voltammetry. The Ti 3 C 2 /MWCNT/Chit modified glassy carbon electrode exhibits enhanced electrocatalytic activities toward the oxidation of target analytes. Excellent conductivity, large surface area, and high catalytic properties of the Ti 3 C 2 –MXene showed synergistic effects with MWCNTs and helped in achieving low detection limits of targets with high selectivity and reproducibility. The assay allows determination of IFO, ACOP, DOM, and SUM in the concentration ranges 0.0011–1.0, 0.0042–7.1, 0.0046–7.3, and 0.0033–61 μM with low detection limits of 0.00031, 0.00028, 0.00034, and 0.00042 μM, respectively. The sensor was successfully applied for voltammetric screening of target analytes in urine and blood serum samples with recoveries > 95.21%. Schematic illustration of the synthesis of self-assembled MXene/MWCNT/chitosan nanocomposite is given and its application to the voltammetric determination of ifosfamide, acetaminophen, domperidone, and sumatriptan described.
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高影响因子
FIBERS AND POLYMERS
·
2020
·Vol. 21
·期 6
·1229-1237
·
IF 1.797
Zhang Yiyi,Zhang Nan,Wang Qiang,Yu Yuanyuan,Wang Ping,Yuan Jiugang
Most modifications of wool focused on its surface due to the existence of the cuticle scales. For instance, chlorination, oxidation and protease treatments were used to break down or remove the scales. However, these modifications usually severely damaged the internal structure of wool. In this paper, a novel approach based on surface micro-dissolution was employed to modify the surface of wool to minimize the internal damage of wool, and improve the surface-related properties of wool. The micro-dissolution system used NaHSO 3 /urea to dissolve the scale layer of wool. After being micro-dissolved with NaHSO 3 /urea system, scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), fluorescence microscopy, Fourier transform infrared spectroscopy (FTIR), and the Allwörden reaction were utilized to characterize the treated wool. Furthermore, felting shrinkage, strength loss and wettability of the treated wool were determined. The results showed that NaHSO 3 /urea system could dissolve the scale layer from outside to inside. The fluorescence microscopic images further indicated that low concentration of NaHSO 3 /urea system can dissolve the surface of wool without the serious damage of internal structure. Moreover, the micro-dissolution system can be controlled to dissolve the scale layer on the surface of wool slightly by adjusting the reaction conditions. The presented method is simple, easy to operate, and economical, thereby can open up new directions for the surface modification of wool.
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高影响因子
危险品化学品经营许可证（带存储）