CHEMICAL ENGINEERING JOURNAL
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2018
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IF 6.735
Rongrong Li,Wubing Yao,Yanxian Jin,Wenping Jia,Xiaoying Chen,Jingjing Chen,Jianli Zheng,Yuan Hu,Deman Han,Jia Zhao
Hydrocinnamaldehyde (HCAL) is a crucial intermediate in the manufacture of perfumes and pharmaceuticals, but highly selective hydrogenation of cinnamaldehyde (CALD) to hydrocinnamaldehyde with a good conversion rate is a challenging. We report that the incorporation of Ag into Pd-based catalysts promotes their catalytic activity and HCAL selectivity (HCAL selectivity of 98.6% with >99.9% CALD conversion for Pd-0.3Ag/MCM-41) for CALD hydrogenation compared to those of catalysts with no Ag, e.g., HCAL selectivity of 84.5% for Pd/MCM-41and 77.3% for Pd/AC (activated carbon). The Pd-0.3Ag/MCM-41 catalyst shows an outstanding stability during five cycles of use. The excellent performance of the Pd-0.3Ag/MCM-41 catalyst in CALD hydrogenation is due to the ultra-small size of the Pd nanoparticles (Pd-Ag alloy, a geometric and electronic modification of Pd).
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JOURNAL OF NANOPARTICLE RESEARCH
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2019
·Vol. 21
·期 6
·1-10
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IF 2.009
Wang Wenfang,Liu Jing,Li Xia,Jiang Qinglin,Xu Jingkun,Luo Chan,Liu Peipei,Tan Rongri,Du Yukou,Jiang Fengxing
One-dimensional silver telluride nanowires (NWs) as potential thermoelectric materials have been studied extensively. At present, most of the efforts are focused on p-type silver telluride, while limited works have been achieved on the preparation of n-type silver telluride. Herein, we prepared n-type Te/Ag 2 Te NWs by galvanic exchange reaction and fabricated a nanofilm. As a simple and cost-effective method, galvanic exchange reaction was employed to prepare n-type Te/Ag 2 Te NWs with obtained Seebeck coefficient of − 93.98 μV K −1 . The nanostructure and chemical composition as well as structural phase transition of as-prepared n-type Te/Ag 2 Te NWs were characterized and discussed. Besides, the thermoelectric thin film device consisting of n-type Te/Ag 2 Te nanofilms and p-type Ag-doped Te nanofilms obtained by one-step hydrothermal method was assembled and exhibited accessible output voltage as 65 mV at the 75 K temperature difference, which may provide the fundament for the development of inorganic thermoelectric nanofilm device.
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PROCESS BIOCHEMISTRY
·
2019
·
IF 2.883
Bing Zhang,Yejing Jia,Jing Wang,Honghong Chang,Zhihuan Zhao,Yan Cheng
Under the limitations of advanced instruments and professional operations, straightforward readouts play an increasingly vital role in immunoassays. Herein, a Ag 2 CO 3 @Ag nanocomposite-mediated colorimetric and photothermal immunoassay was developed to detect carcinoembryonic antigen (CEA). The Ag 2 CO 3 @Ag nanocomposites could oxidize 3,3’,5,5’-tetramethylbenzidine to form blue oxidation products (TMB ox ) due to the acidic dissolution of Ag 2 CO 3 under acidic conditions. TMB ox presented a strong photothermal effect driven by a near-infrared (NIR) laser. Therefore, TMB ox could act as a photothermal probe to convert immunoassay signals into thermal signals. The Ag 2 CO 3 @Ag nanocomposite was characterized by transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and X-ray powder diffraction (XRD). Then, a sandwich-type immunoassay was built on the surface of a magnetic bead, and CEA was quantified using a common thermometer based on the photothermal effect. Under optimal conditions, the temperature increased with increase of CEA concentrations in the range of 0.1 ng/mL–5 ng/mL. More importantly, this system exhibited high selectivity, good repeatability and outstanding stability.
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NANOTECHNOLOGY
·
2017
·Vol. 29
·期 4
·044002
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IF 3.44
Liang Huang,Chengpeng Jiao,Liqiong Wang,Zili Huang,Feng Liang,Simin Liu,Yuhua Wang,Haijun Zhang,Shaowei Zhang
ISOBAM-104 protected Rh/Ag bimetallic nanoparticles (NPs) with average diameter less than 3.0 nm were synthesized by a co-reduction method. Ultraviolet–visible spectroscopy, transmission electron microscopy (TEM), high-resolution TEM and x-ray photoelectron spectroscopy (XPS) were employed to characterize the structure, particle size, and electronic structure of the prepared bimetallic NPs. The catalytic activities of prepared bimetallic NPs for hydrogen generation from hydrolysis of a basic KBH4 solution were evaluated in detail. The results indicated that as-prepared Rh/Ag bimetallic NPs showed a higher catalytic activity than corresponding monometallic NPs. Among all the monometallic NPs and bimetallic NPs, Rh80Ag20 bimetallic NPs exhibited the highest catalytic activity with a value of 6010 mol-H2·h−1·mol-catalyst−1 at pH = 12 and 303 K. The high catalytic activities of Rh/Ag bimetallic NPs could be attributed to presence of negatively charged Rh atoms and positively charged Ag atoms, which is supported by the results of XPS and density functional theory calculation. Based on the kinetic study, the apparent activation energy for the hydrolysis reaction of the basic KBH4 solution catalyzed by Rh80Ag20 bimetallic NPs was about 47.0 ± 3.9 kJ mol−1.
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PubMed
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CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Ying Liu,Jijie Kong,Julong Yuan,Wei Zhao,Xin Zhu,Cheng Sun,Jimin Xie
A novel ternary Ag/Ag 2 CO 3 /BiVO 4 plasmonic heterojunction photocatalyst was successfully fabricated by a precipitation method over BiVO 4 , followed by light reduction. The obtained composites were characterized by various measurements and the photocatalytic performances of the as-prepared composites were assessed by the degradation of tetracycline (TC) under visible-light illumination. The ternary plasmonic heterojunction photocatalyst exhibits higher and wider absorption in the visible and ultraviolet regions than the pure BiVO 4 and it displays superior performance in the degradation of tetracycline. The highest efficiency of Ag/Ag 2 CO 3 /BiVO 4 photocatalyst to degrade TC is up to 94.9% at 150 min. On the basis of the obtained experimental results, the probable photocatalytic mechanism of the enhanced activity is discussed. The degradation of tetracycline is not only influenced by OH, but also caused by valence-band holes (h + ). Therefore, the improved photocatalytic activity of Ag/Ag 2 CO 3 /BiVO 4 is due to the enhanced absorbance under the visible light, the facilitated charge transfer and the inhibited recombination of electron-hole pairs. The likely degradation pathway was proposed on the basis of the intermediate products detected by GC–MS. Moreover, the surface plasmon resonance and the electric field enhancement were simulated by the three dimensional finite difference time domain (FDTD) method.
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JOURNAL OF POWER SOURCES
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2017
·
IF 6.395
Tao Fu,Jianxing Huang,Shaobo Lai,Size Zhang,Jun Fang,Jinbao Zhao
The catalytic activity and stability of electrocatalyst is critical for the commercialization of fuel cells, and recent reports reveal the great potential of the hollow structures with Pt skin coat for developing high-powered electrocatalysts due to their highly efficient utilization of the Pt atoms. Here, we provide a novel strategy to prepare the Pt skin coated hollow Ag-Pt structure (Ag-Pt@Pt) of ∼8 nm size at room temperature . As loaded on the graphene, the Ag-Pt@Pt exhibits a remarkable mass activity of 0.864 A/mg Pt (at 0.9 V, vs. reversible hydrogen electrode (RHE)) towards oxygen reduction reaction (ORR), which is 5.30 times of the commercial Pt/C catalyst, and the Ag-Pt@Pt also shows a better stability during the ORR catalytic process. The mechanism of this significant enhancement can be attributed to the higher Pt utilization and the unique Pt on Ag-Pt surface structure, which is confirmed by the density functional theory (DFT) calculations and other characterization methods. In conclusion, this original work offers a low-cost and environment-friendly method to prepare a high active electrocatalyst with cheaper price, and this work also discloses the correlation between surface structures and ORR catalytic activity for the hollow structures with Pt skin coat, which can be instructive for designing novel advanced electrocatalysts for fuel cells.
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SENSORS AND ACTUATORS B-CHEMICAL
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2017
·
IF 5.401
Wenmin Yin,Long Wu,Fan Ding,Qin Li,Pan Wang,Jinjie Li,Zhicheng Lu,Heyou Han
To circumvent the limitations of natural antibodies, receptor, or enzyme, molecular imprinting technique has received intensive attention in analytical methods Herein, based on surface enhanced Raman scattering (SERS) molecularly imprinted polymer (SERS-MIP), a SERS-MIP sensor has been developed for the sensitive and selective detection of bisphenol A (BPA). To construct the BPA sensor, raspberry-type SiO 2 @Ag nanoparticles (SiO 2 @Ag NPs) were prepared to act as supporting substrate, and BPA was adopted as template molecule, tetraethyl orthosilicate (TEOS) as functional monomer and 3-aminopropyltriethoxysilane (APTES) as cross-linker. Due to the strong plasma resonance character of Ag NPs, the SERS-MIP sensor showed good sensitivity in the detection of BPA. The core-shell and satellite-like structure of the SiO 2 @Ag composites could provide a large surface area for BPA recognition by molecular binding domains. In addition, the sensor could prevent interferences such as 4,4′-(Hexafluoroisopropylidene) diphenol (BPAF) and 4,4′-Dihydroxybiphenyl (DOD). Moreover, the real water samples were tested to verify the reliability and feasibility of the method. Under the optimal conditions, the proposed method behaved good analytical performance to BPA with a wide linear range from 1.75 × 10 −11 to 1.75 × 10 −6 M and a detection limit of 1.46 × 10 −11 M.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2017
·Vol. 33
·期 6
·946-950
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IF 1.024
Ji Ye,Han Tianyi,Zhang Yong,Wang Ziying,Zhang Tong,Leng Jiyan
Ag nanocubes-reduced graphene oxide(AgNCs-rGO) nanocomposite was successfully prepared by an in situ synthesis method, in which AgNCs were loaded onto the surface of rGO during the formation of AgNCs in an ethylene glycol solution. Characterization by X-ray diffraction, UV-Vis spectroscopy, and scanning electron microscopy indicated the successful preparation of the AgNCs-rGO nanocomposite. Most importantly, the AgNCs-rGO nanocomposite exhibited excellent electrocatalytic activity for the reduction of H 2 O 2 , leading to a high-performance non-enzymatic H 2 O 2 sensor with a linear detection range and detection limit of approximately 0.1 mmol/L to 70 mmol/L( r =0.999) and 0.58 μmol/L, respectively. Our present work provides a new and highly efficient method for fabricating high-performance electrochemical sensors.
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International Journal of Nanomedicine
·
2024
·
IF 6.6
Guoqiang Xu,Xiaona Song,Xiaotang Wang,Rui Xue,Xiaoru Yan,Litao Qin,Xiaoqi Chang,Jiping Gao,Zhaoyang Chen,Guohua Song
Purpose Oral squamous cell carcinoma is the most common type of malignant tumor in the head and neck region. Despite advancements, metastasis and recurrence rates remain high, and patient survival has not significantly improved. Although miRNA therapies are promising for cancer gene therapy, their applications in treating oral cancer are limited. Targeted medication delivery systems based on nanotechnology offer an efficient way to enhance oral cancer treatment efficacy.Methods We synthesized nanosilver (AgNPs) and loaded them with the tumor suppressor miR-181a-5p. In vitro experiments were conducted to investigate the inhibitory effects of AgNPs and their composites on the malignant behavior of oral cancer cell lines. The xenograft experiment was utilized to examine their effects on tumorigenesis and the potential molecular mechanisms involved.Results The nanosilver exhibited a spherical morphology with a size distribution ranging from 50 to 100 nm. They exhibited a distinct absorption peak at 330 nm and could be excited to emit green fluorescence. The biocompatible AgNPs effectively shielded miRNA from degradation by RNase and serum. The nanocomposites significantly inhibited the proliferation, invasion, migration, and colony formation of oral cancer cell lines. Notably, treatment with the nanocomposites resulted in substantial tumor growth suppression in the xenograft model. Mechanistically, these composites directly targeted BCL2 and exerted their antitumor effects by suppressing the β-catenin signaling pathway and other downstream genes without inducing acute toxicity.Conclusion Collectively, the findings demonstrate that the miR-181a-5p/AgNPs combination significantly impedes the growth and progression of oral cancer both in vitro and in vivo, highlighting a pivotal role for the β-catenin signaling pathway. This multifaceted approach holds promise as a prospective therapeutic strategy for oral cancer management in the future.
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PubMed
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
·
IF 4.9
Yaxin Wang,Zhen Xu,Shuangshuang Zhao,Yongjun Zhang,Wei Li,Jiahong Wen,Renxian Gao,Bohong Zheng,Lijun Liang,Xiaoyu Zhao
The Ag nanonail rooted in Au cross-channel nanocavity is fabricated by plasmon-mediated chemical reactions (PMCRs). The Au cross-channel nanocavity is prepared based on two-dimensional polystyrene (PS) nanosphere template through wet etching, and the shape of Au cross-channel nanocavity changes from trapezoidal to triangular, depending on the wet etching time. The growth of Ag nanostructures in Au channels by PMCRs indicates the morphology of Ag nanostructures has changed from Ag nanoparticles to nanonails, which is regulated by the shape of Au nanocavities and the exciting light polarization. The hotspots distributions results in the anisotropic growth of Ag nanostructures induced by PMCRs, which leading to the different Ag nanostructures depending on the shape of Au nanocavity and light polarization, as confirmed by FDTD simulations. In comparison with others reports, our nanocavity provide more parameters to control the shapes of Ag nanostructures, the nanocavity shape, the light polarization and the growth time. Our work provides a profound insight into the construction of periodic nanostructures and reconstruction of hotspots.
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ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Fenglong Sun,Qian Jing,Tongda Xing,Yue Li,Bolong Jiang,Yang Zhao,Huan Wang
In this study, a Ag/CCN composite photocatalyst with a dragon-fruit section structure synthesized by loading silver nanoparticles (Ag NPs) onto CCN (g-C3N4 modified by M-phenylenediamine), is successfully employed as the photoanode in the H2O2 fuel cell system. Through the optimization of Ag NP loading amount, the 5%-Ag/CCN composite-based fuel cell exhibits a maximum power density of 1.195 mW·cm–2 in an aqueous solution containing 0.1 M HCl under AM 1.5G illumination (1 sun, 100 mW·cm–2), which is about 2.4 times higher than that of the g-C3N4-based fuel cell. The solar-to-electricity conversion efficiency (SECE) of the above fuel cell is further calculated to be 0.886%. Additionally, the 5%-Ag/CCN-based photocatalytic H2O2 fuel cell shows high stability during the charge and discharge process and strong energy storage capacity, along with a specific capacitance of 6860 mF·cm–2 after 2 h of irradiation and a capacitance retention rate of 60.33% even after 6 h of continuous operation. The localized surface plasmon resonance (LSPR) effect of Ag NPs significantly enhances the light capture capability of the photoanode, and the Schottky junction formed at the interface between Ag NPs and CCN effectively suppresses the recombination of photogenerated electrons and holes, promoting the photocatalytic oxidation of H2O to generate H2O2. This study provides a feasible strategy for constructing an efficient photoanode to generate H2O2, further improving the energy conversion efficiency and stability of H2O2 fuel cells.
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Materials Chemistry Frontiers
·
2024
·
IF 6
Yujiao Xie,Xue Li,Lei Xu,Chenguang Zhang,Yong Ren,Xiaofeng Shi,Liyun Fu,Jing Wang,Xiawei Xu,Yue Liu,Yue Hu,Zhouxu Zhang,Jiahao Zhang,Ting Yao,Wenzhi Ren,Tianxiang Chen,Xiaoyu Qian,Xiaotian Wang,Jie Lin,Aiguo Wu
Early diagnosis and treatment of liver fibrosis can effectively prevent chronic liver disease from developing into hepatocellular carcinoma (HCC). Conventional techniques to detect liver fibrosis are complex and expensive. The development of non-invasive and sensitive surface-enhanced Raman scattering (SERS) can significantly reduce the time and cost, which is important for improving the efficiency of diagnosis and detection of liver disease. In this study, we developed a cubic core–shell Cu2O@Ag SERS bioprobe for label-free identification of HCC and hepatic fibrosis. The constructed composite substrate has shown impressive SERS sensitivity and good stability. Trace molecules (alizarin red and rhodamine 6G) with concentrations as low as 10−10 mol L−1 could be detected. Cubic Cu2O@Ag also exhibited good SERS stability, since the smallest relative standard deviation (RSD) of Cu2O@Ag-MB (methylene blue) was only 8.80%. Then, the spectral analysis of these three molecules (AR, MB, and R6G) was carried out by applying a machine learning-assisted LDA model, and the classification accuracy reached 100%. Subsequently, four different types of hepatocytes were identified and classified by using the established model and label-free SERS detection with a desirable accuracy of 91.38%. This innovative technology will further facilitate the early diagnosis of HCC and liver disease and assist in the rationalization of clinical treatment.
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