Removal of cobalt ions from aqueous solution by Ag/Fe bimetallic nanoparticles

Huang, Jiarui,Fang, Fang,Wang, Liyou,Shim, Jae-Jin Taylor Francis 2015 Desalination and Water Treatment Vol.56 No.8

Investigation of Large-scale Transmission Tower Grounding Grid with High Amplitude and Uniform Flowing Impulse Current

Yang, Shuai,Huang, Jiarui,Wei, Shaodong,Zhou, Wenjun The Korean Institute of Electrical Engineers 2018 Journal of Electrical Engineering & Technology Vol.13 No.5

Impulse characteristic of transmission tower grounding grid is needed for lightning protection of transmission line. This paper describes an outdoor experimental test facility established for large-scale grounding grid of transmission tower, made up of four impulse current generators and a circle current return electrode. The amplitude of impulse current is up to 100 kA. The results of the CDEGS simulation and GPR measurement reveal the uniform current distribution in the test arrangement. An impulse test for a square electrode with extended conductors is carried out in condition of three current waveforms with different amplitude. Based on the electrical network model and iterative algorithm method, a calculation model is proposed to simulate the impulse characteristic of large-scale grounding grid considering soil ionization. The curve of impulse resistance against the current amplitude shows the soil ionization both from the simulation and test. Deviation between the simulation and test result is less than 15%.

Investigation of Large-scale Transmission Tower Grounding Grid with High Amplitude and Uniform Flowing Impulse Current

Shuai Yang,Jiarui Huang,Shaodong Wei,Wenjun Zhou 대한전기학회 2018 Journal of Electrical Engineering & Technology Vol.13 No.5

Impulse characteristic of transmission tower grounding grid is needed for lightning protection of transmission line. This paper describes an outdoor experimental test facility established for large-scale grounding grid of transmission tower, made up of four impulse current generators and a circle current return electrode. The amplitude of impulse current is up to 100 kA. The results of the CDEGS simulation and GPR measurement reveal the uniform current distribution in the test arrangement. An impulse test for a square electrode with extended conductors is carried out in condition of three current waveforms with different amplitude. Based on the electrical network model and iterative algorithm method, a calculation model is proposed to simulate the impulse characteristic of large-scale grounding grid considering soil ionization. The curve of impulse resistance against the current amplitude shows the soil ionization both from the simulation and test. Deviation between the simulation and test result is less than 15%.

Identification and Validation of Circulating MicroRNA Signatures for Breast Cancer Early Detection Based on Large Scale Tissue-Derived Data

Xiaokang Yu,Jinsheng Liang,Jiarui Xu,Xingsong Li,Shan Xing,Huilan Liu,Wan-Li Liu,Dongdong Liu,Jianhua Xu,Lizhen Huang,Hongli Du 한국유방암학회 2018 Journal of breast cancer Vol.21 No.4

Purpose: Breast cancer is the most commonly occurring cancer among women worldwide, and therefore, improved approaches for its early detection are urgently needed. As microRNAs (miRNAs) are increasingly recognized as critical regulators in tumorigenesis and possess excellent stability in plasma, this study focused on using miRNAs to develop a method for identifying noninvasive biomarkers. Methods: To discover critical candidates, differential expression analysis was performed on tissue-originated miRNA profiles of 409 early breast cancer patients and 87 healthy controls from The Cancer Genome Atlas database. We selected candidates from the differentially expressed miRNAs and then evaluated every possible molecular signature formed by the candidates. The best signature was validated in independent serum samples from 113 early breast cancer patients and 47 healthy controls using reverse transcription quantitative real-time polymerase chain reaction. Results: The miRNA candidates in our method were revealed to be associated with breast cancer according to previous studies and showed potential as useful biomarkers. When validated in independent serum samples, the area under curve of the final miRNA signature (miR-21-3p, miR-21-5p, and miR-99a-5p) was 0.895. Diagnostic sensitivity and specificity were 97.9% and 73.5%, respectively. Conclusion: The present study established a novel and effective method to identify biomarkers for early breast cancer. And the method, is also suitable for other cancer types. Furthermore, a combination of three miRNAs was identified as a prospective biomarker for breast cancer early detection.

Effective hydrogen gas sensor based on NiO@rGO nanocomposite

Ren, Haibo,Gu, Cuiping,Joo, Sang Woo,Zhao, Jingjuan,Sun, Yufeng,Huang, Jiarui Elsevier 2018 Sensors and actuators. B Chemical Vol.266 No.-

<P><B>Abstract</B></P> <P>A NiO@rGO nanocomposite is prepared by a freeze-drying method combined with heat treatment. The morphology and structure are analyzed through X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Raman spectra, and X-ray photoelectron spectroscopy. The results clearly show that NiO nanoparticles are uniformly anchored on the surface of the rGO nanosheet. The gas-sensing performance of the nanocomposite is also investigated to detect hydrogen. The NiO@rGO sensor exhibits good gas-sensing performance with high sensitivity, fast response, good reversibility, and selectivity toward hydrogen. The relative response of the sensor to 1% hydrogen is 0.64, the response time is 28 s, and the recovery time is 142 s. The improved sensing performance is due to the effective electron transfer between the NiO nanoparticles and rGO nanosheet.</P> <P><B>Highlights</B></P> <P> <UL> <LI> NiO@rGO nanocomposite consisting of NiO NPs uniformly anchored on rGO is developed. </LI> <LI> The preparation method involves freeze-drying followed by heat treatment. </LI> <LI> NiO@rGO sensor shows high response and selectivity to H<SUB>2</SUB> at low working temperature. </LI> <LI> High performance is ascribed to the electron transfer between NiO NPs and rGO. </LI> </UL> </P>

Synthesis of hierarchical α-Fe₂O₃ nanotubes for high-performance lithium-ion batteries

Gu, Cuiping,Song, Xinjie,Zhang, Simin,Ryu, Si Ok,Huang, Jiarui Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.714 No.-

<P><B>Abstract</B></P> <P>Hierarchical α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanotubes are facially synthesized via a sacrificial template strategy without chemical etching, and are then employed as the anode material for lithium-ion batteries (LIBs). FeC<SUB>2</SUB>O<SUB>4</SUB>·2H<SUB>2</SUB>O nanorods are used as the sacrificial template to prepare nanotubes consisting of numerous nanosheets. The resultant hierarchical hollow structures possess an inter-diameter range of 400–600 nm and exhibit a large specific surface area. The as-prepared hierarchical nanotubes demonstrate remarkable improvement in cycling stability (500 cycles) and a reversible Li<SUP>+</SUP> storage capacity as high as 764.2 mAh g<SUP>−1</SUP> at a current density of 0.5 A g<SUP>−1</SUP>. This excellent electrochemical performance suggests that the hierarchical α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanotubes prepared herein are promising candidate anode materials for LIBs.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hierarchical α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanotubes were obtained via a sacrificial template strategy. </LI> <LI> The hierarchical α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanotubes exhibited high lithium ion storage performance. </LI> <LI> High performance was attributed to the tubular structure and large surface area. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Hierarchical α-Fe<SUB>2</SUB>O<SUB>3</SUB> nanotubes obtained via a sacrificial template strategy followed by calcination process, showed excellent lithium ion storage performances.</P> <P>[DISPLAY OMISSION]</P>

Synthesis of a Novel Ce-bpdc for the Effective Removal of Fluoride from Aqueous Solution

Zhao, Changqing,Cui, Yanwei,Fang, Fang,Ryu, Si Ok,Huang, Jiarui Hindawi Limited 2017 Advances in condensed matter physics Vol.2017 No.-

<P>Ce-1,1′-biphenyl-4,4′-dicarboxylic acid (Ce-bpdc), a novel type of metal organic framework, was synthesized and applied to remove excessive fluoride from water. The structure and morphology of Ce-bpdc were measured by X-ray diffraction, scanning electron microscopy, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The effects, such as saturated adsorption capacity, <SUP><SUB>HCO3</SUB>-</SUP>, and pH, were investigated. The optimal pH value for fluoride adsorption was the range from 5 to 6. The coexisting bicarbonate anions have a little influence on fluoride removal. The fluoride adsorption over the Ce-bpdc adsorbent could reach its equilibrium in about 20 min. The Ce-bpdc coordination complex exhibited high binding capacity for fluoride ions. The maximum adsorption capacity calculated from Langmuir model was high up to 45.5 mg/g at 298 K (pH = 7.0) and the removal efficiency was greater than 80%. In order to investigate the mechanism of fluoride removal, various adsorption isotherms such as Langmuir and Freundlich were fitted. The experimental data revealed that the Langmuir isotherm gave a more satisfactory fit for fluoride removal. Finally, the tested results of ground water samples from three places, Yuefang, Jiangji, and Sanyi which exhibited high removal efficiency, also demonstrate the potential utility of the Ce-bpdc as an effective adsorbent.</P>

Co₉S₈@MoS₂ core-shell nanostructure anchored on reduced graphene oxide with improved electrochemical performance for lithium-ion batteries

Ren, Haibo,Gu, Cuiping,Zhao, Jingjuan,Joo, Sang Woo,Huang, Jiarui Elsevier 2019 APPLIED SURFACE SCIENCE - Vol.473 No.-

<P><B>Abstract</B></P> <P>Co<SUB>9</SUB>S<SUB>8</SUB>@MoS<SUB>2</SUB> core-shell nanoparticles anchored on both sides of reduced graphene oxide (Co<SUB>9</SUB>S<SUB>8</SUB>@MoS<SUB>2</SUB>/rGO) were synthesized via hydrothermal reaction. The core-shell composites were used as an anode material and demonstrated enhanced electrochemical performance with high capacity, capacity retention, cycling stability, and rate capability during cycling tests. The nanocomposites deliver a reversible capacity of 2014.5 mAh g<SUP>−1</SUP> at a high rate of 0.3 A g<SUP>−1</SUP> with a capacity retention efficiency of 82.8% after 200 cycles. The reduced graphene oxide-based three-dimensional framework of the core-shell structure can reduce the internal resistance of the whole electrode, facilitate more Li<SUP>+</SUP> ion insertion and extraction from the crystal structure, and relieve the strain caused by volume change during the lithiation/delithiation process. The electrochemical behaviors could make the composites a great potential anode material for lithium-ion batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Co<SUB>9</SUB>S<SUB>8</SUB>@MoS<SUB>2</SUB> core-shell nanostructure anchored on rGO was developed. </LI> <LI> It involves two-step hydrothermal reaction. </LI> <LI> The Co<SUB>9</SUB>S<SUB>8</SUB>@MoS<SUB>2</SUB>/rGO composites exhibit high stable capacity and rate performance. </LI> <LI> High performance is ascribed to the special hierarchical core-shell nanostructure. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Controlled synthesis of porous Ni-doped SnO₂ microstructures and their enhanced gas sensing properties

Gu, Cuiping,Guan, Wenmei,Liu, Xiaosi,Gao, Lvlv,Wang, Liyou,Shim, Jae-Jin,Huang, Jiarui ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.692 No.-

<P><B>Abstract</B></P> <P>Porous Ni-doped SnO<SUB>2</SUB> microspheres and microcubes were obtained via a facile chemical solution route followed by calcination and acid-washing process. Their structural and morphological evolution was characterized using a range of techniques. The process of inducing porosity began with crystalline single-phase NiSn(OH)<SUB>6</SUB> precursors formed by the co-precipitation of metal ions from an aqueous solution. Thermal decomposition of the precursors led to an intimate mixture of cubic phase NiO and tetragonal phase SnO<SUB>2</SUB>. The Ni-doped SnO<SUB>2</SUB> microspheres and microcubes were obtained after a simple acid-washing process. A decomposition–aggregation–dissolution process was proposed to explain the formation of these structures. The gas-sensing properties of the as-prepared porous Ni-doped SnO<SUB>2</SUB> microspheres and microcubes for toxic volatile organic compounds, such as formaldehyde, ethanol, benzene, methanol, acetone, and toluene, were investigated. The enhanced sensing performance of the porous Ni-doped SnO<SUB>2</SUB> microspheres was demonstrated. The detection limits of formaldehyde and ethanol were approximately 0.17 and 0.09 ppm (signal-to-noise ratio, S/N = 3), respectively. The enhanced sensing performance of the porous Ni-doped SnO<SUB>2</SUB> microspheres was attributed to their Ni-dopant, unique porous structure and large surface area.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Porous Ni-doped SnO<SUB>2</SUB> microstructures were obtained by treatment of the precursors. </LI> <LI> Porous Ni-doped SnO<SUB>2</SUB> microstructures exhibited excellent gas-sensing properties. </LI> <LI> Excellent gas-sensing properties were attributed to the Ni-dopant and 3D structures. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>Porous Ni-doped SnO<SUB>2</SUB> microspheres and microcubes, obtained by a facile chemical solution route followed by calcination and acid-washing, showed excellent gas-sensing performances.</P> <P>[DISPLAY OMISSION]</P>