ACS Omega
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2018
·
IF 0
Guorong Gao,Liufang Wang,Yang Cong,Zhenwu Wang,Yang Zhou,Rong Wang,Jing Chen,Jun Fu
Hydrogel actuators that deform in response to external stimuli have promising applications in diverse fields. It is desirable to develop robust hydrogels with multiple and synergistic stimuli responsiveness. This work reports on robust poly(NIPAM-co-DMAPMA)/clay hydrogel bilayers that undergo reversible and repeatable curling/uncurling in response to pH and/or temperature changes. The bilayers are fabricated by sequential synthesis of thermoresponsive N-isopropylacrylamide (NIPAM) and N-[3-(dimethylamino)propyl] methacrylamide (DMAPMA) monomers, which produces robust interface bonding between the layers. Different NIPAM/DMAPMA ratios were used between two gel layers to manipulate the asymmetric responsiveness, thus leading to curling/uncurling of bilayers upon exposure to stimuli. The hydrogel bilayers are fabricated into soft manipulators to grasp and release target objects by pH and temperature changes, and as artificial muscle to lift and move a hanging weight by synergistic pH and temperature stimuli. This work provides a new type of asymmetric responsive hydrogel bilayer with potential applications in biomimetic actuators.
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Analytical Methods
·
2018
·Vol. 11
·期 4
·415-420
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IF 2.073
Tianli Wang,Xue Hu,Xiaodan Zhang,Haiyan Cao,Yuming Huang,Ping Feng
Photoluminescence probes based on a conventional Fenton system show unsatisfactory sensitivity due to low H2O2 decomposition efficiency. Herein, we report that molybdenum disulfide quantum dots (MoS2 QDs) show excellent co-catalytic activity for Fenton reactions due to the Mo4+ active sites on their surfaces facilitating Fe(III)/Fe(II) cycle reactions and high H2O2 decomposition efficiency. The MoS2 QDs were prepared by a simple hydrothermal method, and the obtained MoS2 QDs showed blue fluorescence with a high quantum yield of 13.4%, storage stability, and excellent water-solubility. By using bifunctional MoS2 QDs acting as both the fluorescent probe and the Fenton catalyst, a MoS2 QDs co-catalytic Fenton sensor system was proposed for ultrasensitive and selective fluorescence sensing of H2O2 with a linear range from 0.01 to 20 μM and a detection limit of 5 nM (S/N = 3). When coupled with glucose oxidase, glucose can be detected in the range of 0.01–30 μM with a detection limit of 7 nM. Moreover, we successfully demonstrated the potential application of the proposed system for glucose sensing in actual biological samples. The novel strategy proposed in this work may open a new window of interest in an unconventional application of MoS2 QDs-Fenton sensor platform for environmental and biological applications.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
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2019
·
IF 6.393
Dejian Li,Sisi Zhang,Xuan Feng,Hongjing Yang,Fei Nie,Wenyan Zhang
In this work, a metal organic framework material ([Co(L)(H 2 O) 2 ] n , Co-MOF) was synthesized by a facile hydrothermal method, and it was found that Co-MOF have a peroxidase-like activity. They can efficiently catalyze the chemiluminescence (CL) reaction between luminol and H 2 O 2 and enhance the CL signal significantly. The possible enhancement mechanism suggested that Co-MOF catalyzed the decomposition of H 2 O 2 into O 2 and increased the generation of •O 2 − . Based on these findings, a new highly sensitive glucose sensor was constructed combined with the luminol-H 2 O 2 -Co-MOF CL system and glucose oxidase. Under the optimal conditions, the method exhibited a good linear response to glucose in the range of 0.04˜8 μM with a detection limit of 1 × 10 -8 M. The method has been further applied in the quantitative determination of glucose in human serum and urine successfully.
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高影响因子
JOURNAL OF CLUSTER SCIENCE
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2019
·Vol. 30
·期 4
·985-994
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IF 2.125
Zhou Tong,Cheng Yan,Zhang Haiyuan,Wang Guixia
Titanium dioxide (TiO 2 ) as one of the most important biocompatible semiconductor nanomaterials, has been widely used as antibacterial agents. However, since it is only active under ultraviolet radiation, its application has been dramatically limited. Here, TiO 2 nanoparticle (NP)-Au nanocluster (NC)-graphene (TAG) nanocomposites were designed to improve the antibacterial activity of TiO 2 NPs under sunlight condition. Incorporation of Au NCs and graphene into TiO 2 NPs can significantly enhance the solar energy utilization efficiency and promote the electron–hole separation, leading to enhanced reactive oxygen species (ROS) production in TAG, as evidenced by dihydrorhodamine 123 and DCF assays. Bacterial growth inhibition assessments revealed that TAG nanocomposites possessed more potent antibacterial activity against both gram-negative Escherichia coli ( E. coli ) and gram-positive Staphylococcus aureus ( S. aureus ) bacteria than TiO 2 NPs alone. Scanning electron microscope images of bacteria further displayed that TAG could cause severe damage on the surface membrane structure of both E. coli and S. aureus bacteria. Intracellular ROS production, glutathione depletion, and lipid peroxidation of bacteria were found to be elicited by TAG, suggesting the molecular mechanism underlying their antibacterial activity is possibly based on oxidative stress.
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高影响因子
CRYSTENGCOMM
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2019
·Vol. 21
·期 12
·1876-1885
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IF 3.382
Xiaole Zhang,Dalei Song,Qi Liu,Rongrong Chen,Jingyuan Liu,Hongsen Zhang,Jing Yu,Peili Liu,Jun Wang
Pure and 1–4 mol% cobalt doped indium oxide (Co-doped In2O3) sponge-like microstructures with high specific surface area were fabricated by a simple and environmentally friendly hydrothermal method. The specific surface area and porosity of Co-doped sponge-like In2O3 microstructures can be regulated through the modulation of Co/In molar ratios. The as-prepared sensors based on Co-doped In2O3 exhibit favorable gas sensing properties toward acetone gas; their porous structure can create more adsorption sites for the adsorption of oxygen molecules and the diffusion of the target gas, leading to significant improvement in sensing performance. In particular, 3 mol% Co-doped In2O3 presents the greatest response to acetone vapor at 240 °C, which is about 3.25 times higher than that of pure In2O3. The sensor also exhibits rapid response-recovery time (1.143 s/37.5 s), low detection limit (2.76 at 5 ppm), good reproducibility and high selectivity, making it a promising material for acetone detection.
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高影响因子
ACS Sustainable Chemistry & Engineering
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2019
·
IF 6.97
Shuli Yin,Ziqiang Wang,Xiaoqian Qian,Dandan Yang,You Xu,Xiaonian Li,Liang Wang,Hongjing Wang
Tailoring the morphology and composition of Pt-based nanostructures is crucial to design high-performance electrocatalysts for direct methanol fuel cells. In this work, we propose a facile strategy to fabricate one-dimensional PtM (M = Co, Ni) mesoporous nanotubes (PtM MNTs), in which F127 and Te nanowires facilitate the formation of mesoporous exteriors and cannular interiors, respectively. Owing to the structural advantages of bimetallic mesoporous nanotube architectonics, the PtM MNTs exhibit superior electrochemical performance for the oxygen reduction reaction and methanol oxidation reaction. The proposed dual-template strategy is highly promising for designing active Pt-based mesoporous nanotubes with desired composition toward various electrocatalytic fields.
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高影响因子
JOURNAL OF BIOACTIVE AND COMPATIBLE POLYMERS
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2019
·
IF 1.976
Xin Zhou,Yiwa Pan,Ruihua Liu,Xin Luo,Xianyan Zeng,Dengke Zhi,Jing Li,Quhan Cheng,Ziqi Huang,Hui Zhang,Kai Wang
Electrospun polymer scaffolds are regarded as an ideal tissue engineering scaffold due to similar morphological properties with the native extracellular matrix. Among these, polycaprolactone is widely used to fabricate electrospun fibrous scaffolds due to its excellent biocompatibility, good mechanical properties, and ease of manufacture. However, its low biodegradation rate has a negative influence on its application in tissue engineering scaffold. To address this issue, this study prepared hybrid scaffolds composed of polycaprolactone and polydioxanone (a fast-degrading polyether-ester) via either the blend or co-electrospinning. Subsequently, the structural characteristics, mechanical strength, in vitro/vivo degradation, cellularization, and vascularization of two kinds of hybrid scaffolds were evaluated to decide which method is more suitable for producing tissue engineering scaffolds. The incorporation of polydioxanone increased the mechanical strength of both composite scaffolds. Moreover, co-electrospun scaffolds exhibited improved hydrophilicity compared to blend scaffolds. The results of in vitro and in vivo degradation studies showed that the degradation rate of both composite scaffolds was faster than that of neat polycaprolactone scaffolds due to the incorporated polydioxanone component. Especially in co-electrospun scaffolds, the fast degradation of polydioxanone fiber gave rise to larger pore size, thus leading to faster cellularization and better vascularization compared to blend scaffolds. Therefore, co-electrospinning was demonstrated to be superior to blend electrospinning for the preparation of composite scaffolds. Co-electrospun polycaprolactone–polydioxanone scaffolds may be promising candidates for tissue engineering.
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高影响因子
JOURNAL OF CHROMATOGRAPHY A
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2019
·
IF 3.858
Tianpei Cai,Haijuan Zhang,Jia Chen,Zhan Li,Hongdeng Qiu
A new strategy based on synergistic effect of the carbon dots and their precursor was proposed to enhance the selectivity of hydrophilic interaction liquid chromatography (HILIC). In this work, polyethyleneimine (PEI) and PEI-functionalized carbon dots (PEICDs) mix-grafted silica packing material was prepared to act as a novel HILIC stationary phase. Both inner and outer surface of the porous silica are decorated with the mixture of PEI and carbon dots. This stationary phase, namely Sil-PEI/CDs, demonstrate enhanced retention ability and selectivity toward polar analytes, with which 11 nucleosides and nucleobases and 9 ginsenosides can be nicely separated. The Sil-PEI/CDs (RSD 0.12% – 0.54%) exhibited even better stability than the traditional PEI modified stationary phase (RSD 0.39% – 0.87%) within 40 h of continuously elution. And excellent column efficiency was observed from Sil-PEI/CDs (∼65,000 plates/m for cytidine). The strategy of mixed stabilization revealed a new method to prepare good performanced carbon dots based chromatographic column.
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PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2018
·Vol. 54
·期 6
·4589-4600
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IF 2.993
Tan Jiabin,He Xiaobo,Yin Fengxiang,Liang Xin,Chen Biaohua,Li Guoru,Yin Huaqiang
In this study, a β-Mo 2 C/N, P-co-doped carbon (NPC) catalyst with a porous structure of β-Mo 2 C nanoparticles loading on NPC matrix was prepared by vacuum-rotary evaporation and followed by a facile pyrolysis process for hydrogen evolution reaction (HER). The porous structure is beneficial for exposing more active sites and the mass transfer during the HER. In addition, the carbon matrixes with the highly doped N and P heteroatoms also provide their positive contributions to its high catalytic activity for HER. Owing to the advantages mentioned above, the optimized catalyst shows a small overpotential of 181 mV for driving a cathodic current density of 10 mA cm −2 , a low Tafel slope of 65.3 mV dec −1 and a high exchange current density of 1.5 × 10 −2 mA cm −2 during HER processes in acid electrolyte. The excellent performance of the β-Mo 2 C/NPC makes it a great potential candidate as the HER electrocatalyst.
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高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
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2018
·
IF 3.997
Min Yang,Houqiang Ding,Yixin Zhu,Yanxiu Ge,Lingbing Li
A strategy of preparing mixed micelles containing both DOX prodrug and PTX prodrug was developed, i.e., synthesizing a DOX conjugate and a PTX conjugate started with the same biocompatible amphiphilic copolymer, TPGS and DTDPA, a linker containing disulfide bond. The mixed micelles were prepared by co-assembling the two conjugates with a particle size about 98.5 nm. The mixed micelles could release anticancer drug DOX and PTX upon cellular reduction once they came into the cancerous cells. Moreover, the mixed micelles displayed synergistic effect in vitro and the combination therapy in micellar dosage-form led to reduced systematic toxicity and enhanced antitumor efficacy in vivo .
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PubMed
高影响因子
DALTON TRANSACTIONS
·
2018
·Vol. 48
·期 3
·891-897
·
IF 4.099
Bing Chang,Yingchun Yang,Zhixiang Ye,Shengyu Liu
Hydrogen is the most attractive source of energy in the 21st century. However, high-efficiency mass production of hydrogen still faces many challenges. Although electrochemical water splitting is an ideal way to produce hydrogen, it requires low-cost and efficient electrocatalysts. In this work, a hybrid shell/core Co–P/CuO nanowire array was fabricated by Co–P film electrodeposition on a CuO nanowire array. Because of the synergy between Co–P and CuO nanowire arrays, Co–P/CuO shows remarkable activity toward the hydrogen evolution reaction (HER) and the oxygen evolution reaction (OER). This bifunctional electrocatalyst achieving 20 mA cm−2 requires a cell voltage of only 1.645 V, and has superb long-term electrochemical stability and high faradaic efficiency.
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PubMed
高影响因子
BIOMACROMOLECULES
·
2019
·
IF 5.667
Shue Jin,Fuhua Sun,Qin Zou,Jinhui Huang,Yi Zuo,Yubao Li,Suping Wang,Lei Cheng,Yi Man,Fang Yang,Jidong Li
The purpose of this study was to fabricate a low-immunogenicity fish collagen (FC) and bioactive nanohydroxyapatite (n-HA) enhanced poly(lactide-co-glycolide) (PLGA) nanofibrous membrane for guided bone regeneration (GBR) via electrospinning. The physicochemical properties and morphology study revealed that FC and n-HA particles were homogeneously dispersed in the PLGA fibrous matrix. Notably, the formation of enhanced polymeric chain network due to the interaction between FC and PLGA significantly improved the tensile strength of the PLGA membrane. The incorporation of FC altered the degradation behavior of fibers and accelerated the degradation rate of the PLGA-based membranes. Moreover, the membranes exhibited favorable cytocompatibility with bone mesenchymal stem cells (BMSCs) and human gingiva fibroblasts (HGF) cells. More importantly, the optimized membrane satisfied the requirements of the ‘Biological evaluation of medical devices’ during the incipient biosafety evaluation. All the results indicate that this composite fibrous membrane exhibits significant potential for guided bone or tissue regeneration.
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PubMed
高影响因子
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