APPLIED CATALYSIS B-ENVIRONMENTAL
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2019
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IF 14.229
Changzhen Wang,Xiangyu Jie,Yuan Qiu,Yongxiang Zhao,Hamid A. Al-Megren,Saeed Alshihri,Peter P. Edwards,Tiancun Xiao
Metal sintering and carbon deposition are acknowledged to be the foremost critical issues in the important energy storage process of high temperature Dry Reforming of Methane (DRM). For that process, so-called “core-shell catalysts” have exhibited outstanding catalytic performance. However, the intrinsic confined geometric space of the host core-shell structure not only inevitably limits the ability of the catalyst system to facilitate the critical rapid infusion and diffusion of reacting gases, but also enhances the accompanying conversion of carbon intermediates to inert, catalyst-deactivating carbonaceous deposits under high-space-velocity conditions. Herein, we present a study highlighting the importance of the inner cavity space, now of a quasi-zero-dimensional, tubular, yolk-shell structured Ni@SiO 2 nanocapsule catalyst, in the DRM process. The tubular yolk-shell structured Ni@SiO 2 nanocapsule catalysts having controlled inner cavities (5.0–13.0 nm × 5.0–50.0 nm dimensions) were synthesised via a water-in-oil micro-emulsion method by employing different aging times (i.e. 3 h, 6 h and 12 h). Compared with corresponding Ni@SiO 2 nanosphere catalysts, the tubular nanocapsule catalysts displayed both excellent catalyst activity, stability, and (metal) anti-sintering ability with, equally important, negligible carbon deposition during the operating DRM process under high space velocity conditions (60 L g −1 h −1 ), most relevant for application in real industrial processes.
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Journal of Materials Chemistry C
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2019
·Vol. 7
·期 14
·4199-4209
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IF 6.641
Jiefeng Gao,Lisheng Wu,Zheng Guo,Jiye Li,Cong Xu,Huaiguo Xue
It is desirable to develop strain sensors with large stretchability, high sensitivity, and good anti-corrosive properties, due to their promising applications in wearable electronics. Here, a facile spraying method is used to prepare superhydrophobic and conductive coatings on elastic tape with a hierarchical fluorinated carbon nanotube (FCNT)/SiO2 nanoparticle structure. The uniformly distributed FCNTs construct a conductive network, while hydrophobic SiO2 nanoparticles enhance the surface roughness, contributing to the superhydrophobicity. The superhydrophobic coating possesses excellent stability and durability when subjected to external forces such as repeated stretching and abrasion, and it also exhibits superior anti-corrosive properties. The superhydrophobic coating based strain sensors display an extremely low detection limit of strain (<0.1%) with a large strain sensing range (>80%), high sensitivity with a gauge factor as high as 1766, and excellent reliability and recyclability. The strain sensor could realize the full range monitoring of human motion including large and subtle body movements even in a harsh environment.
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SENSORS AND ACTUATORS B-CHEMICAL
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2019
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IF 6.393
Nian Cao,Faqiong Zhao,Baizhao Zeng
In this work, a novel self-enhanced solid state electrochemiluminescence (ECL) platform, based on polyethyleneimine (PEI) capped CdS quantum dots (PEI-CdS QDs) as coreactant and [email protected] 2 @Ru(bpy) 3 2+ doped silica ( [email protected] 2 @RuDS) nanocomposite as ECL emitter, was constructed. The PEI-CdS QDs integrated double coreactant of PEI and CdS QDs, thus significantly promoted the ECL of [email protected] 2 @RuDS. Polyaniline hydrogel was introduced to boost the electron transfer and to improve the immobilization of PEI-CdS/ [email protected] 2 @RuDS. In addition, creatinine imprinted poly(o-aminophenol) film was electrodeposited on the PEI-CdS/ [email protected] 2 @RuDS surface as recognition element. Thus, the obtained sensor possessed high sensitivity, stability, reproducibility and selectivity for creatinine sensing. The change of ECL intensity and logarithm of creatinine concentration showed a good linear relationship in the range of 0.05 nM to 5 μM, and the detection limit was low to 0.02 nM. The sensor was applied to detect creatinine in human serum and urine samples, and the results were in good agreement with those of commercial enzyme-linked immunosorbent assay kit.
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Polymers
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2019
·Vol. 11
·期 9
·1397
·
IF 3.164
Luwei Zhang,Haijuan Kong,Mengmeng Qiao,Xiaoma Ding,Muhuo Yu
Aramid fibers (AFs) with their high Young′s modulus and tenacity are easy to degrade seriously with ultraviolet (UV) radiation that leads to reduction in their performance, causing premature failure and limiting their outdoor end use. Herein, we report a method to synthesize nano-SiO2on AFs surfaces in supercritical carbon dioxide (Sc-CO2) to simultaneously improve their UV resistance, thermal stability, and interfacial shear strength (IFSS). The effects of different pressures (10, 12, 14, 16 MPa) on the growth of nanoparticles were investigated. The untreated and modified fibers were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). It was found that the nano-SiO2-decorated fibers exhibited improvement of thermal stability and mechanical properties, and the IFSS of the nano-SiO2modified fibers increases by up to 64% compared with the untreated fibers. After exposure to 216 h of UV radiation, the AFs-UV shows a less decrease in tensile strength, elongation to break and tensile modulus, retaining only 73%, 91%, and 85% of the pristine AFs, respectively, while those of AFs-SiO2-14MPa-UV retain 91.5%, 98%, and 95.5%. In short, this study presents a green method for growing nano-SiO2on the surface of AFs by Sc-CO2to enhance the thermal stability, IFSS, and UV resistance.Keywords:aramid fiber;nano-SiO2;supercritical CO2;thermal stability;interfacial shear strength;UV resistance
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PubMed
高影响因子
TALANTA
·
2019
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IF 4.916
Leilei Sun,Tao Wang,Yuzhen Sun,Zexin Li,Haining Song,Bin Zhang,Guangjun Zhou,Haifeng Zhou,Jifan Hu
Dual-functional nanosensors based on small molecule regulation can be widely used due to their simplicity, high sensitivity and selectivity. Herein, glutathione (GSH) calibrated dual-functional system for GSH and cadmium ions (Cd 2+ ) detection based on fluorescence resonance energy transfer (FRET) between NH 2 –NaYF 4 :Yb,Er/NaYF 4 @SiO 2 upconversion nanoparticles (UCNPs) and gold nanoparticles (AuNPs) is designed. Unmodified AuNPs are easy to aggregate in high-salt solution and thereby quenching the red emission of UCNPs. The presence of GSH prevents the aggregation of AuNPs, so GSH can be detected by the changes in the color of solution and the recovery of red emission of UCNPs. However, Cd 2+ can interact with GSH, which makes AuNPs easy to aggregate, resulting in a gradual decrease in red emission of UCNPs. The fluorescence response of the system is linear with the concentrations of GSH and Cd 2+ in a wide range of concentrations, with low detection limits of 0.016 μM and 0.059 μM, respectively. Furthermore, the nanosensor demonstrates high selectivity for GSH and Cd 2+ detection and can be applied for the detection of GSH in human plasma and Cd 2+ in drinking water .
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2019
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IF 4.784
Qingmei Yu,Zhou Wang,Yewang Zhang,Ruijiang Liu
Magnetic Ni 0.5 Zn 0.5 Fe 2 O 4 @SiO 2 nanocomposite was prepared via the rapid combustion process, and its surface was modified to obtain amino-functionalized magnetic Ni 0.5 Zn 0.5 Fe 2 O 4 @SiO 2 -NH 2 nanocomposite. The modified nanocomposite was loaded on graphene oxide (GO), on which penicillin G acylase (PGA) was covalently immobilized. The structure for docking was visualized between PGA and penicillin G using the PyMol program, which revealed the configuration of the active site. Selections of immobilization conditions including immobilization concentration and time of fixation, were explored. The catalytic performance of the immobilized PGA was characterized. The immobilized and free PGA had the highest activity at pH 8.0 and 45 °C. Compared with the activity of the free PGA, the activity of the immobilized PGA was affected less by pH and temperature. The immobilized PGA exhibited the high-effective activity and good stability. V max and K m of immobilized PGA were 0.8123 mol·min −1 and 0.0399 mol·L −1 , respectively. Free PGA's V max and K m were 0.6854 mol·min −1 and 0.0328 mol·L −1 . Immobilized PGA remained >70% in relative activity after 9 successive cycles.
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ACS Applied Materials & Interfaces
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2019
·
IF 8.456
Ying Yang,Jian Zhu,Jing Zhao,Guo-Jun Weng,Jian-Jun Li,Jun-Wu Zhao
The identification and detection of cancer biomarkers in early stages is an important issue for the therapy of cancer. However, most methods are time-consuming and have limited sensing sensitivity and specificity. In this work, we prepared a novel plasmonic multilayered core–shell–satellite nanostructure (Au@Ag@SiO2–AuNP) consisting of a gold nanosphere with a silver coating core (Au@Ag), an ultrathin continuous silica (SiO2) shell, and a high coverage of gold nanosphere (AuNP) satellites. The Au@Ag core is a prominent surface enhanced Raman scattering (SERS) platform, and the thin SiO2 layer exhibits a long-range plasmon coupling between the Au@Ag core to the AuNP satellites, further leading to enhanced Raman scattering. Meanwhile, the outer AuNP satellites have a high biocompatibility and long-term stability. Combining the above advantages, the well-designed metallic nanoassemblies would be a promising candidate for SERS-based applications in biochemistry. For specific detection of alpha-fetoprotein (AFP), we utilized the SERS-active core–shell–satellite nanostructures modified with AFP antibody as immune probes and nitrocellulose membrane (NC) stabilized captured anti-AFP antibodies as solid substrate. To improve the detection performance, we further systematically optimized the parameters, including the silver coating thickness of the Au@Ag core and the density and size of the satellite AuNPs. Under the optimized conditions, AFP could be detected by the SERS-based sandwich immunoassay with an ultralow detection limit of 0.3 fg/mL, and the method exhibited a wide linear response from 1 fg/mL to 1 ng/mL. The limit of detection (LOD) was considerably lower than conventional methods in the literature. This work relies on the unique Au@Ag@SiO2–AuNP nanostructures as the immune probe develops a new outlook for the application of multilayered nanoassemblies and demonstrates the great potential in early tumor marker detection.
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SENSORS AND ACTUATORS B-CHEMICAL
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2018
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IF 5.667
Diandian Deng,Hong Yang,Chang Liu,Kang Zhao,Jianguo Li,Anping Deng
In the last years, surface-enhanced Raman scattering based immunochromatographic assay (SERS-ICA) has been getting great attention and been applied for the detection of different target analytes. In this study, a novel SERS-ICA using Ag MBA @SiO 2 -Ab as an immunoprobe has been developed for rapid, quantitative and ultrasensitive detection of a pharmaceutical diclofenac (DCF) residue in water samples. Ag, [email protected] 2 and Ag MBA @SiO 2 nanoparticles (NPs) were synthesized and characterized. The immunoprobe was prepared by sandwiching the Raman reporter mercaptobenzoic acid (MBA) between the core-shell layers and immobilizing the monoclonal antibody (mAb) against DCF on the surface of the [email protected] 2 NPs. Under optimal conditions, the sensitivity and limit of detection (LOD) of the SERS-ICA for DCF were found to be 9 pg mL −1 and 0.07 pg mL -1 , respectively. The detection of the SERS-ICA for DCF was completed within 15 min. Ag MBA @SiO 2 -Ab was stable within four months without significant loss of SERS intensity. The key to success of the SERS-ICA was the employment of the [email protected] 2 NPs as the SERS substrate, which possessed gorgeous SERS enhancement capability, predominant biocompatibility and excellent stability. This SERS-ICA is potential as an ultrasensitive analytical method in point-of-care testing, clinical diagnosis, food inspecting and environmental monitoring.
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JOURNAL OF POWER SOURCES
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2018
·
IF 6.945
Xiaoxi Zuo,Jinhua Wu,Xiangdong Ma,Xiao Deng,Jiaxin Cai,Qiuyu Chen,Jiansheng Liu,Junmin Nan
A poly(vinylidene fluoride)/ethyl cellulose and amino-functionalized nano-SiO 2 (PVDF-EC-(A-SiO 2 )) composite coated on polyethylene (PE) is developed as the functional separator of 5 V high-voltage lithium ion batteries with enhanced performance. Compared with the PE separator, the composite membrane has a uniform interconnected structure, an increased melting temperature from 138 °C (PE) to 140.8 °C, a decreased contact angle from 49.5° to 23.2°, and higher ionic conductivity from 0.34 mS cm −1 to 0.79 mS cm −1 . In particular, the electrochemical window is raised to 5.3 V (vs. Li/Li + ). LiNi 0.5 Mn 1.5 O 4 /Li batteries with this separator display a high discharge capacity of 131.6 mAh g −1 and a superior cycling stability with a capacity retention of 95.7% after 200 cycles at 0.5 C. Those results demonstrate that the PVDF-EC-(A-SiO 2 )/PE composite separator exhibits a good-performance in cycling stability and thermal stability, implying promising potential application in high-voltage lithium ion batteries.
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Food Analytical Methods
·
2018
·Vol. 11
·期 9
·2438-2446
·
IF 2.245
Niu Jiahua,Zhang Xiaoting,Qin Peige,Yang Yixin,Tian Shufang,Yang Hui,Lu Minghua
In this research, a dispersive solid-phase extraction (dSPE) with graphene oxide@SiO 2 (GO@SiO 2 ) nanocomposites as the adsorbent followed by high-performance liquid chromatography analysis was developed for simultaneous determination of melatonin, l -tryptophan, and two l -tryptophan-derived esters in food (black sesame seed ( Sesamum indicum L. ) was selected in this case). The GO@SiO 2 nanocomposite was prepared by one-pot aggregation in aqueous phase with sol-gel technique. The structure and morphology of the GO@SiO 2 were characterized by scanning electron microscopy, transmission electron microscopy, Fourier transform-infrared spectroscopy, and X-ray diffraction. The extraction conditions of dSPE including the ratio of material to liquid, adsorption and desorption time, desorption temperature, and desorption solvents were investigated, respectively. The detection limits of the developed method for the analysis of melatonin, l -tryptophan, l -tryptophan methyl ester, and l -tryptophan ethyl ester were achieved below 0.1 μg mL −1 . The established method was successfully applied to the analysis of the target analytes in black sesame seed, which provided a simple, low-cost, and sensitive approach for the determination of trace compounds in complex samples.
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ENERGY & FUELS
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2017
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IF 3.091
Guolin Jing,Zhengnan Sun,Ziyi Tu,Xudong Bian,Yu Liang
Nanohybrid pour-point depressants (PPDs) were prepared by organically modified nano-SiO2 in copolymers of ethylene and vinyl acetate (EVA) with various vinyl acetate contents. The effects of nanohybrid PPDs on the cold-flow properties of 25 wt % wax model oil were evaluated. The crystallization behavior and crystal morphology of the model oil at low temperatures were also observed using polarized optical microscopy. The results indicated that the co-crystallization and dispersion effects of EVA on wax crystals are the key factors in determining the heterogeneous nucleation effect of the nanohybrid PPDs. The vinyl acetate content in EVA strongly affects the compatibility between the modified nanosilica and EVA. As a result, the selection of an appropriate EVA according to the oils used and the compatibility factor is important. In this work, EVA (VA = 32%)/modified nano-SiO2 composite PPD [N-SiPPD(32)] provided the best cold-flow improvement for the model oil when doped at 500 ppm. The pour point of the model oil was reduced from 34 to 5 °C, which resulted in a regular, diamond-shaped, and uniform arrangement of wax morphologies.
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APPLIED CATALYSIS B-ENVIRONMENTAL
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2016
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IF 8.328
Jing Hu,Haiqiang Wang,Fan Dong,Zhongbiao Wu
Photothermal effect was for the first time utilized to capture the energy from infrared light and to promote the photocatalytic oxidation activity of NO by a simply mechanical mixing of traditional photocatalysts and core-shell structured Fe 3 O 4 @SiO 2 . Fe 3 O 4 @SiO 2 absorbed the infrared light, transferred it into thermal energy based on photothermal effect, which then accelerated the NO photocatalytic activity of traditional photocatalysts. This promotion effect led by the addition of Fe 3 O 4 @SiO 2 was confirmed by several classical photocatalysts such as TiO 2 , g-C 3 N 4 , BiOI and CeO 2 . To quantitatively characterize the photothermal effect, thermo images were taken with a thermo imager to obtain the average temperature rise of samples under the illumination of simulated solar light. Specially, P25/Fe 3 O 4 @SiO 2 was studied in depth for illustration of the promotion mechanism. Experimental results showed that with the contribution of SiO 2 shell, the photocorrosion of Fe 3 O 4 didn’t occur during photocatalytic oxidation process and the photothermal effect of Fe 3 O 4 was maintained. The quantity of Fe 3 O 4 @SiO 2 was a vital factor for promotion of photocatalytic activity and the optimum mass ratio of P25 and Fe 3 O 4 @SiO 2 was 3–1. After 120 min of illumination, the temperature of optimum P25/Fe 3 O 4 @SiO 2 rose to 57.4 °C from 25 °C and its NO conversion capability showed an enhancement of 38.9% with the comparison to pure P25. The experimental results confirmed that the rise of temperature was attributed to the photothermal effect and its contribution was the same as the directly heating of photocatalysts. Furthermore, the enhancement of NO conversion capability around 30–40% was observed for the Fe 3 O 4 @SiO 2 mixed anatase TiO 2 , g-C 3 N 4 , ZnO, BiOI and CeO 2 . In sum, we developed a new strategy for utilization of NIR light of solar energy to facilitate the photocatalytic reactions.
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