Soft Matter
·
2018
·Vol. 14
·期 22
·4495-4504
·
IF 3.709
Afeng Yang,Xia Dong,Jie Liang,Yan Zhang,Wenzhi Yang,Tianjun Liu,Jun Yang,Deling Kong,Feng Lv
The real-time tracking and adjustment of the disassembly and status of hydrogels in vivo are important challenges to accurate and precise assessment. In this article, a photothermally controllable, visible, dual fluorescent thermosensitive hydrogel was designed and developed based on a porphyrin–poly(ethylene glycol)/IR-820–α-cyclodextrin hydrogel. Due to the photothermal effect and fluorescence emission of IR-820, it can exert the dual functions of photothermal control and fluorescence imaging tracking. The IR-820 conjugated hydrogel can regulate the hydrogel disassembly by the photothermal effect of IR-820. Furthermore, each component of the hydrogel can be tracked by the fluorescence of IR-820 and porphyrin. Fluorescence imaging tracking and remote photothermal control were merged into the visible and controlled hydrogel disassembly after subcutaneous injection using mice as models. The dual fluorescence imaging visualization of cyclodextrin/poly(ethylene glycol) hydrogels revealed the disassembly process by tracking each component, and the hydrogel disassembly can be efficiently accelerated under laser irradiation with the photothermal effect of IR-820. This affords an important basis for understanding the disassembly process of the poly(ethylene glycol)/α-cyclodextrin hydrogel.
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APPLIED ORGANOMETALLIC CHEMISTRY
·
2018
·Vol. 32
·期 12
·e4566
·
IF 3.581
Feng He,Dan Wang,Anyang Wu,Baiyu Jiang,Zhen Zhang,Zhenmei Cheng,Zhisheng Fu,Qisheng Zhang,Zhiqiang Fan
An α-diimine nickel catalyst (Cat-1) with highly conjugated acenaphthylene backbone was synthesized and used in ethylene polymerization. Compared with typical Brookhart catalyst B-Cat, Cat-1 could produce polyethylene with both higher molecular weight (up to 5.1 × 10 5 g mol −1 ) and branching density (up to 135 branches per 1000 carbons) in good polymerization activity. The polyethylene prepared using Cat-1 with higher molecular weight and branching density possessed exceptional mechanical properties (ultimate tensile strength and elongation at break could reach 12.08 MPa and 1148%) and outstanding elastomeric recovery as compared with the polymer prepared using B-Cat. Cat-1 was synthesized using a simple reaction route and the polymerization conditions were suitable for the industrial polymerization process. The novel nickel catalyst Cat-1 is promising for producing highly resilient polyethylene elastomers industrially.
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Friction
·
2019
·Vol. 8
·期 4
·695-707
·
IF 3
Jiang Feng,Sun Haoyang,Chen Lei,Lei Fan,Sun Dazhi
Inorganic nanomaterials exhibit superior friction-reduction and anti-wear properties in oils. In this study, 2D layered α-zirconium phosphate (α-ZrP) nanosheets intercalated with different amines have been synthesized to study their dispersion stabilities in lubricating oil and tribological applications. The intercalated amines should be sufficiently long and lipophilic to provide stabilization to α-ZrP nanosheets in mineral oil. The results of tribological tests illustrate that with the addition of well-dispersed nanosheets, the coefficient of friction (COF) and pin volume loss reduce by ~47% and 75%, respectively. The excellent dispersion stability enables the nanosheets to flow into the contact area at the beginning, and thereby protect the rubbing surface. A reduction in the van der Waals forces between the adjacent layers induced by the intercalated amines transforms the friction between adjacent layers from pin disk to sliding, leading to a decrease in the COF under hydrodynamic lubrication. The study provides a new method to enhance the tribological properties via tuning the dispersion stabilities of nanomaterials in oils.
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Molecular Catalysis
·
2017
·
IF 0
Xiaoyan Wang,Fengli Yu,Congxia Xie,Shitao Yu
Polyvinyl alcohol (PVA)-stabilized ruthenium nanoparticles in water were synthesized and characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and confocal laser scanning microscope (CLSM). The Ru-PVA catalyst was highly effective for the hydrogenation of α-pinene, exhibiting higher selectivity for cis -pinane as well as high conversion. The selectivity could reach approximately 99%. The catalyst phase could be recycled at least eight times without obvious loss in the catalytic activity and selectivity. Furthermore, both the preparation of catalyst and hydrogenation of α-pinene were under mild experimental conditions. Using water as the reaction medium and PVA as the stabilizing agent made the hydrogenation process environmentally friendly. This catalytic system may also be used to convert a range of cyclenes and long chain alkenes, in particular aromatic compounds to corresponding hydrogenated products.
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NEW JOURNAL OF CHEMISTRY
·
2024
·Vol. 48
·期 15
·6723-6732
·
IF 2.7
Min Sun,Yu Zhang,Zhijun Liang,Rui Zhang,Kai Zhang,Yanhong Lin,Dejun Wang,Tengfeng Xie
Supercapacitors often deliver a significantly high-power density with a long cycling life but low energy density. An exceedingly promising approach is to construct asymmetric supercapacitors (ASCs) reconciling the compromise between power density and energy density. However, ASCs combining transition metal oxides (TMOs) and activated carbon (AC) struggle to improve energy density due to a vast difference in their specific capacitance. To cross this hurdle, we first proposed a new strategy to construct the ASCs with α-MoO3 as the anode and conductive polymer polypyrrole (PPy) as the cathode. The remarkable features of α-MoO3, including its layered structure and ultra-high specific capacitance, along with the stability and fast charge–discharge ability of PPy, have contributed significantly to the augmentation of power density and energy density in ASCs. Taking advantage of these bright features, the operation voltage for α-MoO3//PPy is effectively expanded to 2.0 V, exhibiting a high energy density of 25.9 W h kg−1 at 1538 W kg−1. Furthermore, the energy density presented a remarkable recovery rate, reaching 91.04% of its initial state after undergoing full rate tests. These conclusions reveal that the construction of α-MoO3//PPy can effectively enhance the energy density and power density of supercapacitors.
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JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 19
·9704-9713
·
IF 5.968
Gang Liu,Quan Deng,Hongqiang Wang,Dickon H. L. Ng,Mingguang Kong,Weiping Cai,Guozhong Wang
Micro/nanostructured α-Fe2O3 spheres (MNFSs) were fabricated via a surfactant- and template-free method, involving the hydrothermal synthesis of FeCO3 precursor firstly and a subsequent thermal decomposition treatment. The product was characterized by X-ray diffraction, field emission scanning electron microscopy and transmission electron microscopy. The MNFSs had an average diameter of about 5 μm, and each contained subunits of interlinked and elongated particles with size less than 30 nm. The UV-Vis spectrum of MNFSs exhibited visible-light absorption. The visible-light photocatalytic activity of MNFSs was evaluated by using them to degrade the rhodamine 6G pollutant in water at ambient temperature under different parameters such as pH value, the amount of MNFSs and H2O2. We also found that the visible-light photocatalytic activity of MNFSs was higher than that of the micron- and nano-sized α-Fe2O3 particles. The reaction rate of MNFSs was more than twice that of nano-sized α-Fe2O3 and nearly 12 times faster than that of the micron-sized α-Fe2O3. This high photocatalytic feature of MNFSs was attributed to the high specific surface area together with their special porous structure. Importantly, these characteristics could control the rate of releasing ·OH and thus improve the utilization efficiency of ·OH. MNFSs can be easily recycled from the treated water using a magnet due to its magnetic behavior. There was no obvious decrease of the photocatalytic activity of MNFSs after being used.
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CHEMICAL PAPERS
·
2017
·Vol. 69
·期 4
·596-603
·
IF 1.258
Zhang Yu-Peng,Hu Xiao-Chun,Li Zheng
The conjugate hydrocyanation of α -cyanoacrylates through chemoselective 1,4-addition to synthesise α,β -dicyanopropanoates by one-pot two-step procedure using potassium hexacyanoferrate(II) as an eco-friendly cyanide source, benzoyl chloride as a promoter and potassium carbonate as a catalyst is described. The advantages of this protocol are use of a non-toxic, non-volatile and inexpensive cyanating reagent, high product yields and simple working procedure.
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INDUSTRIAL CROPS AND PRODUCTS
·
2017
·
IF 3.181
Fa Xu,Dongyu Gu,Miao Wang,Lin Zhu,Tingting Chu,Yuna Cui,Jing Tian,Yi Wang,Yi Yang
The present study was performed to screen the α-amylase inhibitor in the essential oil from Cedrus deodara cones. For this purpose, a fast and efficient method based on GC–MS and molecular docking was established for identification chemical compositions and prediction their activity in the essential oil with the potential α-amylase inhibitory activity. A total of 28 compounds were identified from the essential oil through GC–MS, which were individually docked with α-amylase as the target through molecular docking. Longipinene with the lowest binding energy of −5.93 kcal/mol was completely enfolded in the active site of α-amylase, which indicated that longipinene possessed the potential α-amylase inhibitory activity. The experimental verification exhibited that longipinene with an IC 50 value of 34.47 ± 0.54 μg/mL, indicating that it is the active ingredient responsible for the activity of this essential oil. The result revealed that the present strategy can facilely screen the active compounds from the complex natural plant extract.
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Journal of Functional Foods
·
2016
·
IF 3.973
Xuejing Jia,Jie Hu,Muxue He,Qingwen Zhang,Peng Li,Jianbo Wan,Chengwei He
Rhynchosia minima root, a renowned traditional Chinese medicinal herb, has been shown to exhibit multiple therapeutic activities. In this study, the α-glucosidase inhibitory activity of R. minima root polysaccharide fractions (PRM1, PRM3 and PRM5) is evaluated. PRM3 displays an excellent inhibitory activity with an IC 50 value of 8.85 mg/mL, which is similar to that of acarbose, a positive control compound that has been applied for the control of postprandial hyperglycemia. PRM3 is a homogeneous fraction with an average molecular weight of 97.3 kDa. The results of methylation analysis, periodate oxidation and nuclear magnetic resonance (NMR) spectra reveal that the repeating units of PRM3 are mainly composed of (1 → 3,4)-α-Ara p , (1 → 4,6)-β-Gal p , (1 → 2,4)-β-Rha p , (1 → 3,4)-β-Gal p A, T-α-Ara f and T-α-Gal p residues. Moreover, triple helix stereo-configuration has been proven to exist in PRM3. In summary, the strong α-glucosidase inhibitory activity and unique structural feature of PRM3 suggest that it could have a potential application in functional foods.
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ELECTROCHIMICA ACTA
·
2016
·
IF 4.803
Qingliang Feng,Kaiyue Duan,Hong Xie,Muyin Xue,Yongling Du,Chunming Wang
Two dimensional (2D) transition metal dichalcogenides have attracted intense potential application in catalytic because of its fantastic physical and chemical properties. But, how the metal oxide affects the catalytic performance of transition metal dichalcogenides was not clear yet, which always exists as main byproduct in the synthesized process of hydrothermal method . Herein, we report synthesis of 2H-MoSe 2 nanoflower and 2H-MoSe 2 /α-MoO 3 heterostructure by hydrothermal method. The chemical composition , morphology and crystalline structure of nano-composite were characterized by field-emission scanning electron microscopy (FESEM), high resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The 2H-MoSe 2 nanoflower shows more positive onset overpotential around −150 mV and a current density of 32.5 mA cm −2 at −300 mV. The smaller Tafel slope of 2H-MoSe 2 nanoflower is around 69 mV dec −1 reveals the Volmer-Heyrovsky mechanism for HER. The results of linear scan voltammetry (LSV) curves demonstrated that both of them displayed good stability. This work demonstrated that the metal oxide can reduce the catalysis performance of transition metal dichalcogenides towards HER.
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RSC Advances
·
2016
·Vol. 6
·期 86
·82977-82983
·
IF 3.289
Jing-Quan Sha,Xiao-Hua Zhong,Lian-He Wu,Guo-Dong Liu,Ning Sheng
A novel α-cyclodextrin based metal–organic framework (CD-MOF) with chiral helices, K3(C36H60O30)2·7H2O (1), was synthesized by vapor diffusion method, which contains infinitely long left-handed helical chains, interdigitated with six circumambient helical chains. Compound 1 exhibits efficient drug loading capacity and excellent sustained release behavior. In addition, by changing the synthetic method, another compound based on α-cyclodextrin, (C36H60O30)·H2O (2), was isolated by solvothermal synthesis, which contains left-handed chiral helical double channels, linked with adjacent four same helical channels. Moreover, the lower cytotoxicity of the two compounds indicates that they are a type of renewable, environmentally friendly and biocompatible drug carrier material.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Huafang Ding,Xing Hu,Ximing Xu,Guowen Zhang,Deming Gong
Glycemic control which can be efficaciously regulated by inhibiting α-glucosidase activity is an effective therapy for diabetes mellitus. This work is to investigate the kinetics and inhibition mechanism of oleanolic acid and ursolic acid on α-glucosidase. Oleanolic acid and ursolic acid exhibited potent inhibitory activities with IC 50 values of (6.35 ± 0.02) × 10 −6 and (1.69 ± 0.03) × 10 −5 mol L −1 respectively in a reversible and non-competitive manner. Both of them binding to α-glucosidase induced the conformational change and intrinsic fluorescence quenching of α-glucosidase. The binding constants of oleanolic acid and ursolic acid with α-glucosidase at 298 K were (2.04 ± 0.02) × 10 3 and (1.87 ± 0.02) × 10 3 L mol −1 , respectively. Docking results showed that oleanolic acid and ursolic acid bound in different allosteric sites of cavity 2 and cavity 4 on α-glucosidase, respectively, which triggered allosteric regulation to perturb conformational dynamics of α-glucosidase, eventually leading to a decrease of catalytic activity of the enzyme. The substrate was not catalyzed by α-glucosidase to generate further products due to formation of a nonreactive ternary complex of oleanolic acid– or ursolic acid–α-glucosidase–substrate. The combination of oleanolic acid and ursolic acid displayed a significant synergistic inhibition on α-glucosidase.
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