CHEMICAL ENGINEERING JOURNAL
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2019
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IF 8.355
Xun Fan,Guangcheng Zhang,Qiang Gao,Jiantong Li,Zhengyang Shang,Hongming Zhang,Yu Zhang,Xuetao Shi,Jianbin Qin
In this work, epoxy foams with high volume expansion ratio and excellent electromagnetic interference (EMI) are fabricated by the supercritical carbon dioxide as blowing agent. So far, the volume expansion ratio of about 20 for epoxy foam reported in this work is the highest in literature and reported for the first time, related to the strategy of introducing hyperbranched epoxy and solvent-free covalent nanofluid hybrid material of nanocarbon black as modifier and nucleated agent. Meanwhile, incorporating commercial silver nanosheet (AgNS) into above-foamed system achieves two synergistic effects: one is the significant increase of electrical conductivity and the other is the well controllable cell structure to avoid cell coalescence. In turn, the uniform cell distribution of epoxy foams is favorable for the formation of more efficient conductive networks related to the biaxial stretching on rearrangement in the cell wall and inter-connection of AgNS. Multi-properties including electrical conductivity of 89.12 S/m, specific EMI SE (SSE) of 334.59 dB·cm 3 /g and thermal conductivity of 58.71 mW/m·K are achieved in the epoxy composite foam with 20.0 wt% AgNS. The EMI mechanism is dominated by absorption rather than reflection due to electromagnetic waves attenuated by AgNSs in cell walls after the waves reflecting several times in cells. This work provides SCCO 2 foaming strategy as a feasible path to generate epoxy conductive polymer composite (CPC) foam with lighting weight, low thermal conductivity, outstanding electrical conductivity, excellent EMI SE and accessible mechanical strength.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 16
·15754-15765
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IF 2.195
Sun Jialin,Huang Dejia,Liu Rui,Dai Jingtao,Chen Jian
To improve the visible-light photocatalytic performance of TiO 2 for practical application, Ag/AgBr modified TiO 2 was fabricated in ionic liquid–water medium via a facile hydrothermal-reduction method. The visible-light catalytic activity of as-prepared Ag/AgBr/TiO 2 was measured using tetracycline (TC) as the target pollutant. Characterizations by various techniques (SEM–EDS, XRD, XPS and DRS) and the quenching experiments with scavengers for possible active species (h + , • O 2 − and ·OH) were executed to probe the mechanism underlying the photocatalytic performance. Critical impacts from the catalyst and solution chemistry were evaluated in the mediums of TC solution, simulated wastewater and real wastewater sample. The results suggested that: (1) benefitting from the visible-light sensitive Ag/AgBr and high specific surface area TiO 2 , Ag/AgBr/TiO 2 exhibits fair stability and remarkable visible-light photocatalytic activity; (2) under optimized conditions, Ag/AgBr/TiO 2 provides higher visible-light catalytic activity than Ag/AgBr and TiO 2 ; (3) the coexisting inorganic ions with high concentration in the simulated wastewater sample depress TC photo-degradation, and the impacts varies with the species of inorganic ions; (4) COD removal rate about 65.5% in real wastewater sample proves that Ag/AgBr/TiO 2 can mineralize TC promptly and almost completely.
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Journal of the Taiwan Institute of Chemical Engineers
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2019
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IF 3.834
Lei Bai,Xiaoli Zhang,Zhijie Ding,Xuchun Wang,Youju Huang,Palanisamy Kannan
Synthesis of silver/zinc oxide heterostructured nanorods (Ag/ZnO HNRs) is demonstrated via a simple one-step solvothermal method. The size of silver nanoparticles (AgNPs) on zinc oxide nanorods (ZnO NRs) are tuned by controlling the amount of AgNO 3 and the optimized decoration of AgNPs significantly enhance the utilization of visible light. Particularly, the Ag/ZnO HNRs samples are used to examine the photocatalytic degradation of methyl orange (MO) and reduction of potassium dichromate (K 2 Cr 2 O 7 ). The obtained results display that the Ag/ZnO HNRs possess surprising photocatalytic activities towards the removal of MO and reduction of K 2 Cr 2 O 7 . Further, the photocatalytic activities are related with the size of AgNPs and the length of ZnO NRs. Finally, the investigation towards the degradation of other dye molecules such as rhodamine B (RhB), and methyl blue (MB) along with MO at higher concentrations from morning to evening upon exposing sunlight under static condition. The present work could provide a further insight into the synthesis of ZnO based heterostructured photocatalysts and their application in efficient water treatment under natural conditions.
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Nanoscale
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2018
·Vol. 10
·期 12
·5532-5538
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IF 7.233
Bi-Yun Fang,Cheng Li,Jie An,Sun-Duo Zhao,Zhi-Yong Zhuang,Yuan-Di Zhao,Yue-Xuan Zhang
In this paper, DNA containing six cytosines as the formation site for silver nanoclusters (Ag NCs) was adopted as a template for preparing fluorescent DNA-Ag NCs. For the first time, it was found that the fluorescence of DNA-Ag NCs could be quenched after hybridization with their complementary sequence. On the basis of this new phenomenon, we designed a sequence C1 that was completely complementary to human immunodeficiency virus (HIV) DNA, and probe DNA which was partially complementary to C1 for the synthesis of DNA-Ag NCs. The fluorescence of DNA-Ag NCs was quenched after hybridization with C1 and the DNA-Ag NCs/C1 composite was formed, while C1 could be dissociated away from the DNA-Ag NCs by HIV DNA through a strand exchange reaction due to the stronger affinity between HIV DNA and C1, which could switch on the quenched Ag NCs, thus a new “off–on” fluorescence method for HIV DNA detection was developed. In the experiment, the Ag NCs formation site of DNA, the number of base pairs, and the pH and salt concentration of binding buffer were optimized. Under the optimum conditions, the limit of detection for HIV DNA was obtained to be 3.18 nM (3σ/N, n = 7) with the linear range of 15–150 nM for the 150 nM DNA-Ag NCs/C1 probe. Besides, the probe showed excellent specificity to HIV DNA, and even distinguished one nucleotide mismatched HIV DNA.
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PubMed
高影响因子
NANO
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2018
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IF 1.1
Chang Liu,Qianqian Su,Li Li,Jie Sun,Jian Dong,Weiping Qian
In this work, we designed a simple substrate-immersed solvothermal route for the one-step synthesis of novel ordered SiO 2 /Ag arrays, employing SiO 2 colloidal crystals as templates and alcohol as reducing agent. The Ag nanoparticles were uniformly deposited in situ onto SiO 2 colloidal crystals, which exhibited high surface enhanced Raman spectroscopy (SERS) activity and uniform SERS intensity. It was found that ordered SiO 2 /Ag arrays could rapidly scavenge the absorbed-Nile blue A (NBA) molecules from the surfaces with the assistance of H 2 O 2 , while the SERS signals of NBA decreased sharply and almost completely disappeared within four minutes. This can be attributed to the superior catalytic activity of Ag nanoparticles. After five times of re-immersion and re-absorbing process of NBA, the substrates could still keep ∼ 74.8% SERS intensity versus the original. The high activity and durability of the as-prepared SiO 2 /Ag SERS substrate endow them as a promising candidate for trace detection.
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Nanomaterials
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2018
·Vol. 8
·期 6
·376
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IF 3.504
Luhang Xu,Dengpo Huang,Huimei Chen,Xiaoling Jing,Jiale Huang,Tareque Odoom-Wubah,Qingbiao Li
Synthesis and applications of one dimensional (1D) metal nanostructures have attracted much attention. However, one-step synthesis of bimetallic nanowires (NWs) has remained challenging. In this work, we developed a microorganism-mediated, hexadecyltrimethylammonium bromide (CTAB)-directed (MCD) approach to synthesize closely packed and long Au-Ag NWs with the assistance of a continuous injection pump. Characterization results confirmed that the branched Au-Ag alloy NWs was polycrystalline. And the Au-Ag NWs exhibited a strong absorbance at around 1950 nm in the near-infrared (NIR) region, which can find potential application in NIR absorption. In addition, the Au-Ag NWs showed excellent surface-enhanced Raman scattering (SERS) enhancement when 4-mercaptobenzoic acid (MBA) and rhodamine 6G (R6G) were used as probe molecules.Keywords:microorganism-mediated;Au-Ag NWs;SERS enhancement;Pichia pastoriscells;CTAB
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PubMed
高影响因子
CATALYSIS COMMUNICATIONS
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2018
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IF 3.463
Kun Liu,Tao Qin,Yongbin Sun,Chao Hou,Xiaoqun Cao,Shoujun Jiang
Ag 2 Mn 5 /SiC catalyst is simply obtained by in-situ reaction-induced of their corresponding nitrate compounds onto SiC support, which exhibits excellent catalytic activity and stability in the gas phase oxidation of alcohols (94% conversion of benzyl alcohol and 98% selectivity of benzaldehyde). The catalytic activity could maintain at least 300 h after four regenerations due to the formation of highly active Ag 0 -Mn 3 O 4 species. XRD and XPS indicate that active Ag 0 -Mn 3 O 4 species is formed from Ag 2 O and MnO 2 in the reaction conditions. The synergistic effect between 34 nm Ag nanoparticles and 5.5 nm Mn 3 O 4 nanoparticles in alcohol oxidation reaction is prominent, which is testified by HRTEM and three-step experiment.
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JOURNAL OF NANOPARTICLE RESEARCH
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2018
·Vol. 20
·期 1
·1-13
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IF 2.127
Wu Jie,Zhou Yifeng,Nie Wangyan,Chen Pengpeng
This paper reported a one-step synthesis of Ag 2 S/Ag@MoS 2 nanocomposites and its applications in the surface-enhanced Raman scattering (SERS) detection and photocatalytic degradation of organic pollutants. The nanocomposites were well characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), cyclic voltammograms (CV), the Brunauer-Emmett-Teller (BET), and Fourier transforms infrared spectra (FTIR). The AgNPs were uniformly dispersed on the MoS 2 nanosheets and the particle size of the AgNPs was about 10–30 nm. These Ag 2 S/Ag@MoS 2 nanocomposites offered sensitive SERS signals for the detection of R6G with the limit of detections as low as 10 −10 M. The photocatalytic activity of the composite catalyst was studied by the degradation of methylene blue (MB) dye under light illumination. The apparent rate constant of MB degradation for the obtained catalyst could reach 6.6 × 10 −2 min −1 , indicating that the novel Ag 2 S/Ag@MoS 2 nanocomposites can be explored for organic pollutant’s detection and degradation.
One-step synthesis of Ag 2 S/Ag@MoS 2 nanocomposites for SERS and photocatalytic applications
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COLLOID AND POLYMER SCIENCE
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2018
·Vol. 296
·期 9
·1409-1417
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IF 1.967
Wang Jianing,Zheng Yan,Chen Wanyi,Wang Zhaoqun
A simple and effective method is proposed to prepare Ag nanoparticle-immobilized hollow silica particles (SiO 2 HP/AgNP composite particles). Ag 2 O nanoparticles are first immobilized on hollow silica particles (SiO 2 HP) by in situ thermolysis of AgNO 3 to get SiO 2 HP/Ag 2 ONP composite particles. Then, the Ag 2 ONPs immobilized on SiO 2 HP are translated to AgNPs by chemical or thermal reduction to obtain SiO 2 HP/AgNP composite particles. The resultant AgNPs have ultrafine nano-size and uniform and dense distribution, which benefits from the slow and moderate reaction in the formation of Ag 2 ONPs. The influencing factors including the surface property of SiO 2 HP, mass proportion of silver salt to silica, and reaction temperature have been studied. The composite particles exhibit excellent catalytic efficiency and repeatability in 4-nitrophenol reduction. Moreover, the catalytic activity can be further enhanced by adding a trace amount of NH 3 into the system, which has obvious synergies for catalysis with AgNPs.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2018
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IF 3.141
Xiaopeng Han,Ying Huang,Qiao Gao,Meng Yu,Xuefang Chen
Weak interfacial bonding and the agglomeration of reinforcements are critical challenges for the expected performance in thermal management materials, hindering the extensive application of aluminum matrix composites. In this work, Cu particles, nanotubes, Ag-coated graphite flakes and films, urea, and starch were mixed together to fabricate porous preforms, which then were infiltrated by vacuum gas pressure at 720 °C. The effects of graphite film thickness on the microstructure and properties of thermal conductivity (TC) and coefficient of thermal expension were investigated. The nanotube@Cu/Ag@graphite/aluminum composites exhibited a high TC of 451 W/mK and excellent bending strength of 74 MPa, which were approximately increased by 48.8% and 126%, respectively, as compared with the samples without graphite film.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
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2019
·Vol. 30
·期 16
·14977-14986
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IF 2.195
Tang Hongbo,Li Qiuyue,Zhou Jian
The effect of low I/Ag ratios on the performance of silver thick films containing micro-sized silver particles treated with surface iodination has been investigated. The film with I/Ag ratio of 1:100 exhibited high electrical conductivity and densification, while that of 2:100 presented better adhesion. The conductivity and densification of the film reached the highest at 550 °C. Optimal conductivity of the film with I/Ag ratio of 1:100 and 2:100 was 11.45 and 15.85 mΩ/sq., respectively. In addition, the film adhesion was enhanced by heating. Different trends observed in electrical conductivity and adhesion as functions of temperature is primarily attributed to shrinkage of modified particles. This work suggested that the I/Ag ratio plays a vital effect on the performance of the silver thick film.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2017
·
IF 9.446
Qixing Zhou,Shuanglong Ma,Sihui Zhan
Ordered mesoporous Ag/CeO 2 nanocomposites were prepared by combining nanocasting with photo-assisted reduction. The heterogeneous photoreactivity of the prepared samples was tested for inactivating Escherichia coli ( E. coli ). These mesoporous Ag/CeO 2 nanocomposites exhibited superior photocatalytic disinfection efficiency than mesoporous CeO 2 and bulk CeO 2 , respectively. Doping Ag species could extend the absorption range to visible light area and enhance the concentration of Ce 3+ ions and oxygen vacancies, which had significant influence on the surface properties of CeO 2 . Moreover, it is the first time to verify that created midgap states through doping Ag can significantly lower the threshold of incident photon energy and broaden the adsorption spectrum demonstrated by experimental studies and density functional theory (DFT) calculations. The enhanced disinfection mechanism was attributed to the fact that the novel mesoporous structure can promote the mass transfer process and the interfacial interaction between Ag species and CeO 2 and lead to reduced recombination of free charges, rapid separation and transportation of photogenerated electrons-holes. This work provides a new method to develop novel mesoporous plasmonic photocatlysts for disinfection using solar radiation.
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