APPLIED SURFACE SCIENCE
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2016
·
IF 3.15
Zezhou Zhu,Jiani Qin,Min Jiang,Zhengxin Ding,Yidong Hou
Photocatalytic reduction of carbon dioxide can convert chemically inert carbon dioxide into useful chemical fuel in a mild manner. Herein, Ag-CdS nanocomposites were prepared by photodeposition method and examined for photocatalytic CO 2 reduction under visible light. Meanwhile, the nanocomposites were characterized by XRD, SEM, TEM, XPS, DRS and PL in detail. The results show that, the deposition of Ag improves the photocatalytic performance of CdS, especially in the selectivity of CO 2 -to-CO. The highest photocatalytic activity is achieved over 1.0 wt.% Ag/CdS, with an increase by 3 times in comparison to CdS. In this reaction system, Ag can serve as electron trap as well as active site for CO 2 reduction, which is probably responsible for the enhanced activity and selectivity of CO 2 to CO over Ag/CdS. The possible mechanism of CO 2 photoreduction over Ag/CdS was proposed in view of the abovementioned analysis.
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高影响因子
POLYMER BULLETIN
·
2016
·Vol. 73
·期 7
·2073-2085
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IF 1.371
Zhang Xuzhen,Ma Piming,Zhang Yong
Cellulose nanocrystal (CNC) was extracted from microcrystalline cellulose (MCC) and then surface modified by acetic anhydride to obtain acetylated CNC (ACNC). ACNC that has lower polarity than CNC was mixed with poly(butylene adipate- co -terephthalate) (PBAT) through melt blending to obtain composites. ACNC was uniformly dispersed in PBAT matrix as evidenced by scanning electron microscopy observation. Thermogravimetric analysis indicates the thermal stability of PBAT could be improved by the addition of either CNC or ACNC. In the rheological tests and dynamic mechanical analysis, PBAT/ACNC composites showed higher melt elasticity, complex viscosity, storage modulus and glass transition temperature than PBAT/CNC composites, indicating a stronger interfacial adhesion between ACNC and PBAT. As a result of the uniform dispersion of ACNC and strong interfacial adhesion between ACNC and PBAT, mechanical properties of PBAT/ACNC composites improve obviously. Good mechanical properties, high initial decomposition temperature and high glass transition temperature of PBAT/ACNC composites could contribute to the practical commercial utilization of PBAT.
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高影响因子
RSC Advances
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2016
·Vol. 6
·期 109
·107709-107716
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IF 3.289
Zhenyuan Ji,Yuqin Wang,Juan Yang,Xiaoping Shen,Qiang Yu,Lirong Kong,Hu Zhou
Herein, Co nanoparticles with high dispersivity were grown in situ on reduced graphene oxide (RGO) nanosheets by an environmentally friendly and facile one-step strategy. The as-synthesized products were characterized by X-ray powder diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and transmission electron microscopy (TEM). The magnetic and catalytic properties of the RGO/Co nanocomposites were systematically investigated. The results reveal that the RGO/Co nanocomposites have room-temperature ferromagnetic characteristics with Co particle size below single domain size. In addition, these RGO/Co nanocomposites also exhibit excellent catalytic activities toward the reduction of 4-nitrophenol by NaBH4 and enhanced electrocatalytic properties for the oxidation of glucose. It is believed that this eco-friendly and facile route can be extended to synthesize other metal nanostructures on RGO nanosheets with various functions, and provides a new opportunity for the application of graphene/metal nanocomposites.
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高影响因子
Journal of Materials Chemistry A
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2017
·Vol. 5
·期 34
·18071-18080
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IF 8.867
Zhigao Zhu,Chenghan Ji,Lingling Zhong,Shuang Liu,Fuyi Cui,Hongliang Sun,Wei Wang
Porous carbonaceous materials are widely used as catalyst carriers to activate peroxymonosulfate (PMS) for catalytic oxidative degradation of organic pollutants. Herein, hierarchical structured ferro-cobalt alloyed crystals supported on nitrogen doped activated porous carbon fibers (FeCo2@APCFs) were prepared by a combination of multicomponent electrospinning, activation, and carbonization. Benefiting from the precursor design and activation process, the carbon fibers derived from a PAN/PBZ (polyacrylonitrile/polybenzoxazine) precursor exhibited a tunable porous structure with an ultrahigh specific surface area (SSA) and pore volume of 2085 m2 g−1 and 1.12 cm3 g−1, respectively. Most importantly, the FeCo2 crystals can be directly synthesized by carbonization at high temperature in a N2 flow with no other reducing gases. The as-prepared FeCo2@APCFs exhibited robust activation of PMS with reactive oxygen radicals (SO4˙−, ˙OH, and 1O2) for ultrafast removal of organic pollutants, as well as good stability and recyclability with high total organic carbon (TOC) removal. The catalyst suspended in aqueous solution after catalysis can be easily separated with an external magnet without tedious separation processes. This study is meaningful for the development of novel catalyst carriers or a fascinating strategy for wastewater treatment.
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高影响因子
Metals
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2017
·Vol. 7
·期 4
·137
·
IF 1.984
Xiaobo Wang,Taoyuan Ouyang,Xiaohua Duan,Chengzhu Ke,Xuemin Zhang,Jie Min,Aang Li,Weiyang Guo,Xudong Cheng
One type of multimodal (comprised of nanometer and sub-micrometer WC particles) and two types of conventional (comprised of nanometer and sub-micrometer WC particles, respectively) WC/Co powders were deposited on AISI 304L stainless steel substrates by using high velocity oxygen fuel spraying. The use of multimodal WC particles was indicated to have a beneficial effect on the solar absorptance (α) of the WC/Co coatings. The α of the multimodal WC coating reached 0.87, which was much higher than what can be achieved by either fine (0.82) or coarse powders (0.80) alone. By microstructural analysis, the enhancement in solar absorptance of the multimodal WC/Co coating was ascribed to the layer of distributed WC particles. During the thermal spraying, the nanostructured WC particles underwent rapid melting for the large specific surface area while the aggregated powders were heated, but not necessarily melted. The molten nano-WC would fill the available pores between the softened and heated aggregates, providing a layered distribution of WC particles for the spray-deposited coating. In this condition, the light-trapping in the multimodal coating will be enhanced due to the efficient light reflection among the multimodal WC particles, which contributes to the enhancement of solar absorptance.Keywords:solar selective absorbing coating;high velocity oxygen fuel;selective absorbing properties
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高影响因子
Energy Storage Materials
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2017
·
IF 0
Yang Li,Haixia Li,Kangzhe Cao,Ting Jin,Xiaojun Wang,Hongming Sun,Jiaxin Ning,Yijing Wang,Lifang Jiao
Designing the hydrogen evolution reaction (HER) electrocatalysts by tuning the micro/nano structure and optimizing composition to overcome the sluggish HER kinetics have fueled intensive research interests in recent years. Herein, the Co and CoP nanograins embedded in porous nitrogen-doped carbon nanofibers (Co/CoP@NC) are prepared by a controllable electrospinning method and subsequent thermal treatments as the wide-pH HER electrocatalysts. Owning to the prominent merits of strong synergistic relationships between Co and CoP nanoparticles , N-doped carbon configuration, and the interconnected three dimensional (3D) porous carbon network, the Co/CoP@NC nanofibers exhibit robust HER activity with affording an overpotential of 117 mV in acidic and 180 mV in alkaline media to deliver the current density of 10 mA cm -2 . As a practical application, when integrated the Co/CoP@NC/Ni foam cathode with the NiFe layered double hydroxides/Ni foam anode (NiFe-LDH/Ni foam), the electrolyzer can afford the cell voltage of 1.62 V to deliver the current density of 10 mA cm -2 , as well as ultralong lifetime of 60 h in alkaline medium, providing a viable alternative to the noble-metal electrocatalysts for water splitting.
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MATERIALS RESEARCH BULLETIN
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2016
·
IF 2.435
Rui Huo,Xue-Ling Yang,You-Qin Liu,Yue-Hua Xu
Visible-light-driven bismuth vanadate (BiVO 4 ) photocatalysts were prepared by the co-precipitation method. The BiVO 4 samples were characterized using X-ray diffraction, UV–visible diffuse reflectance, electrochemical impedance spectroscopy (EIS), photocurrent, and as well as electron microscopy (SEM, TEM). The photocatalytic activity of the as-prepared BiVO 4 samples was tested through the photocatalytic oxidation of glyphosate under visible light irradiation. The dark yellow amorphous BiVO 4 powder was prepared by the HAc method after drying at 70 °C, but the bright yellow monoclinic BiVO 4 was obtained after keeping at room temperature in the air for several days. The dependence of the room temperature crystallization on moisture can explain the low crystallization temperature found in this work. The BiVO 4 sample calcined at 400 °C by the HAc method showed the highest photocatalytic activity for glyphosate degradation under visible light irradiation because of its high charge separation efficiency proven by EIS and photocurrent.
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高影响因子
RSC Advances
·
2016
·Vol. 6
·期 100
·98147-98152
·
IF 3.289
Yuting Cai,Gaolai Du,Guorong Gao,Jing Chen,Jun Fu
Monodisperse poly(NIPAM-co-AAc) microgels doped with either a monocolour photoluminescent quantum dot (QD) or multiple colour QDs have been fabricated by the charge-driven introduction of cysteamine-capped CdTe QDs and the collapse of the polymer network by adjusting the pH of the solution. The photoluminescence intensity and colour of the resulting microgels can be easily adjusted by changing the content of the CA–CdTe QDs in the hybrid microgels and using single or a mixture of different-sized QDs, respectively. In addition, the microgel-encapsulated QDs showed blue shifts, owing to surface coordination by the carboxylic acid. The combined effect of electrostatic interactions and surface chelating resulted in a reduction in microgel size. By tuning the ratio of QDs with different sizes, the photoluminescence of the hybrid hydrogels could be conveniently controlled. This work provides a facile and versatile method to fabricate colour-tunable or multifunctional hybrid hydrogels with broad potential applications.
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高影响因子
RSC Advances
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2015
·Vol. 5
·期 117
·96483-96487
·
IF 3.84
Ruike Li,Meicheng Li,Yingfeng Li,Pengfei Fu,Younan Luo,Rui Huang,Dandan Song,Joseph Michel Mbengue
Metal-assisted chemical etching is a very popular method of fabricating silicon nanostructures. For the dissolution and recrystallization of Ag and the inertia of Au, we present a co-catalytic mechanism of silicon etching using non-overlapping Au and Ag nanofilms. Meanwhile, two kinds of novel nanostructures are obtained by changing the relative positions of the two nanofilms. The results show that regardless of whether the Ag or Au nanofilm is the upper layer, the Ag nanofilm will first react to etch the silicon substrate into silicon nanowires (Si NWs). Afterwards, the Au nanofilm will re-etch the Si NWs into thick pillars (Ag upper) or ultrathin porous Si NWs (Au upper). It should be noted that the vertical etching rates of the two layers are not observably different, in contrast to when the Au and Ag nanofilms are used separately, in which the vertical etching rate of the Ag nanofilm is much higher than that of the Au nanofilm. This occurs because the subsequent re-etching process by the Au nanofilm is conducted at multiple surfaces because Au can generate excessive holes during the decomposition of hydrogen peroxide. Furthermore, this study presents a feasible method for the fabrication of individual, thick (∼200 nm) silicon pillars and ultrathin (∼25 nm) porous Si NWs. These insights are significant for the syntheses of many nanostructures.
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高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
Xi Zhang,Peng-Fei Ren,Hao-Cheng Yang,Ling-Shu Wan,Zhi-Kang Xu
We report a novel approach toward the surface modification of commercial polymer membranes via co-deposition of tannic acid (TA) and diethlyenetriamine (DETA). Particle-free, superhydrophilic, and almost colorless coatings are fabricated on the surfaces of polypropylene, poly(vinylidene fluoride), and poly(tetrafluoroethlene) microfiltration membranes. Cross-linking between TA and DETA plays a crucial role during the co-deposition process, as well as the adhesion of TA on the hydrophobic membrane surfaces. Both the surface wettability and water permeation flux are dramatically improved for the studied membranes after the co-deposition. The results indicate that co-deposition of TA and DETA is great potential for the surface modification of hydrophobic membranes.
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高影响因子
BIOMATERIALS
·
2015
·
IF 8.557
Song Shen,Chun-Yang Sun,Xiao-Jiao Du,Hong-Jun Li,Yang Liu,Jin-Xing Xia,Yan-Hua Zhu,Jun Wang
As part of HCC tumor cellularity , cancer stem cells (CSCs) are considered a major obstacle to eradicate hepatocellular carcinoma (HCC), which is the third most common cause of cancer-related death worldwide, and the accumulation of chemotherapeutic drug-resistant CSCs invariably accounts for poor prognosis and HCC relapse. In the present study, we explored the efficacy of co-delivery of platinum drug and siRNA targeting Notch1 to treat CSCs-harboring HCC. To overcome the challenging obstacles of platinum drug and siRNA in the systemic administration, we developed a micellar nanoparticle (MNP) to deliver platinum(IV) prodrug and si Notch1 , hereafter referred to as Pt(IV) MNP/si Notch1 . We demonstrated that Pt(IV) MNP/si Notch1 was able to efficiently deliver two drugs into both non-CSCs and CSCs of SMMC7721, a HCC cell line. We further found that siRNA-mediated inhibition of Notch1 suppression can increase the sensitivity of HCC cells to platinum drugs and decrease the percentage of HCC CSCs, and consequently resulting in enhanced proliferation inhibition and apoptosis induction in HCC cells in vitro . Moreover, our results indicated that the combined drug delivery system can remarkably augment drug enrichment in tumor tissues, substantially suppressing the tumor growth while avoiding the accumulation of CSCs in a synergistic manner in the SMMC7721 xenograft model.
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PubMed
高影响因子
Materials Science & Engineering C-Materials for Biological Applications
·
2014
·
IF 2.736
Juan Huang,Yanan Xue,Ning Cai,Han Zhang,Kaikai Wen,Xiaogang Luo,Sihui Long,Faquan Yu
To reduce leakage on the drug-delivery pathway to minimize side effect of reduction or pH sensitive drug delivery systems, we designed a glutathione (GSH)/pH co-triggered magnetic nanogel drug delivery system for doxorubicin (DOX) based on the GSH concentration and pH difference between intracellular and extracellular environments. The introduction of superparamagnetic iron oxide nanoparticles (SPION) was intended for magnetic targeting. The magnetic DOX-loaded nanogel was then prepared by the oxidation of thiolated alginate with thiolated SPION in the presence of DOX. The nanogel size can be readily regulated in a range of 120–320 nm upon preparation conditions, with a negative surface charge of around − 40 mV. Saturation magnetization was estimated at 27.4 emu/g Fe by VSM. In vitro release was conducted in simulated cancerous environment conditions such as a high GSH concentration and mild acidity. As a result, the nanogel expressed, upon dual stimuli of pH 5/10 mM GSH, significantly higher accumulative release than upon single stimulus of pH 5 without GSH or pH 7.4/10 mM GSH. In vitro cytotoxicity against HeLa cells clearly illustrated that the nanogel could effectively inhibit cell growth, and the IC 50 was figured out to be 2.3 μg/mL of the nanogel, while the nanogel exclusive of DOX was nontoxic. Confocal laser scanning microscopy observation, combined with the result of Prussian blue staining, indicated that DOX was efficiently internalized into HeLa cells through endocytosis, released into the cytoplasm, and then principally entered the nuclei. The quantitative examination of the iron content revealed an exponential increase in the cellular uptake and an exponential decrease in the uptake efficiency with the fed nanogel. This drug-loaded nanogel could be a promising drug carrier for effective tumor-targeted chemotherapy.
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PubMed
高影响因子
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