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Synthesis of graphitic carbon nitride through pyrolysis of melamine and its electrocatalysis for oxygen reduction reaction

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Chinese Chemical Letters 2013年第2期24卷 103-106页

作者： He-Sheng Zhai Lei Cao xing-hua xia Center for Scanning Electron Microscopy Xiamen University State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering.Nanjing University

Received 2 December 2012 Received in revised form 26 December 2012 Accepted 31 December 2012 Available online 4 February 2013

关键词： Melamineg-C3N4Oxygen reduction reactionElectrocatalysis

Axial ligands tailoring the ORR activity of cobalt porphyrin

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Science Bulletin 2019年第16期64卷 1158-1166页

作者： Yue Zhou Yong-Fang xing Jing Wen Hai-Bo Ma Feng-Bin Wang xing-hua xia School of Chemistry and Chemical Engineering Nanjing University

In an effort to provide visualization and understanding to the electronic ‘‘push effect' of axial ligands on the catalytic activity of cobalt macrocyclic molecules, we design a simple model system involving an[5,10,15,20-tetrakis(4-methoxyphenyl)porphyrin]cobalt(II)(TMMPCo) monolayer axially-coordinated on thiol ligand modified Au electrode and explore the activity of the axial-ligand coordinated TMPPCo toward oxygen reduction reaction(ORR) in acidic medium. Three different ligands, with a decreasing order of coordinating ability as: 4-mercaptopyridine(MPy) > 4-aminothiolphenol(APT) > 4-mercaptobenzonitrile(MBN) are used and a maximum difference in ORR onset potential of 80 mV is observed between the MPy(highest onset potential) and MBN systems(lowest onset potential). The ORR activity of TMPPCo increases with the increase in binding strength of the axial ligand. A detailed mechanism study reveals that ORR on the three ligand coordinated TMPPCo systems shares the same2-electron mechanism with H2 O2 as the terminal product. Theoretical calculation into the structure of the ligand coordinated cobalt porphyrins uncovers the variation in atomic charge of the Co(II) center and altered frontier molecular orbital distribution among the three ligand systems. Both properties have great influence on the back-bonding formation between the Co(II) center and O2 molecules, which has been suggested to be critical toward the O2 adsorption and subsequent activation process.

关键词： Oxygen reduction reaction(ORR) Cobalt porphyrin Axial ligands Push effect

Electric Field Driven Surface Ion Transport in Hydrophobic Nanopores

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Chinese Journal of Chemistry 2021年第6期39卷 1511-1516页

作者： Xin-Lei Ding Zeng-Qiang Wu Zhong-Qiu Li xing-hua xia State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjingJiangsu 210023China

Water behavior in nanoconfined hydrophobic environment is different from that in the bulk,which greatly influences mass *** switching of nanopores showing great potential for controlled water or ion transport has been realized through several methods,especially the voltage-triggered wetting/dewetting inspired by biological ion ***,in the hydrophobic silanized nanopores,the finite ionic current is still observed and the ion transport mechanism is not yet ***,we explore the ion transport behavior in the hydrophobic silanized anodic aluminum oxide(AAO).Ion transport through this hydrophobic membrane is confirmed,although no aqueous pathway was *** show that ions transport through the cross-linked silane layer on the inner *** is revealed that metal ions,not just the protons or hydroxide ions,are involved in the ion transport driven by external electric *** study provides a new insight into the ion transport in nanoconfined hydrophobic environment which is helpful to understand the biological processes and design new nanofluidic devices.

关键词： Hydrophobic interface Surface ion transport Nanotechnology Surface chemistry Silanes

Emerging advances in plasmonic nanoassemblies for biosensing and cell imaging

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Chinese Chemical Letters 2023年第9期34卷 15-24页

作者： Jin Wang Chen Wang Jing-Juan Xu xing-hua xia Hong-Yuan Chen College of Chemistry and Materials Science Nanjing Normal UniversityNanjing 210023China State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Integrating discrete plasmonic nanoparticles into assemblies can induce plasmonic coupling that produces collective plasmonic properties,which are not available for single *** analysis revealed that plasmonic coupling derived from assemblies could produce stronger electromagnetic field enhancement ***,plasmonic assemblies enable better performance in plasmon-based applications,such as enhanced fluorescence and Raman *** makes them hold great potential for trace analyte detection and ***,we focus on the recent advances in various plasmonic nanoassembles such as dimers,tetramers,and core-satellite structures,and discuss their applications in biosensing and cell *** fabrication strategies for self-assembled plasmonic nanostructures are described,including top-down strategies,self-assembly methods linked by DNA,ligand,polymer,amino acid,or proteins,and chemical overgrowth ***,their applications in biosensor and cell imaging based on dark-field imaging,surface-enhanced Raman scattering,plasmonic circular dichroism,and fluorescence imaging are ***,the remaining challenges and prospects are elucidated.

关键词： Plasmonic nanoasssembly Dark-field imaging Plasmonic circular dichroism Surface-enhanced Raman scattering Biosensing Cell imaging

A sensitive and validated LC-MS/MS method for high-throughput determination of pomalidomide in human plasma and pharmacokinetic studies

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Chinese Chemical Letters 2022年第2期33卷 916-919页

作者： Chang Shu Teng-Fei Li Duo Li Zhong-Qiu Li xing-hua xia State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China Department of Pharmaceutical Analysis School of PharmacyChina Pharmaceutical UniversityNanjing 210009China School of Pharmacy Department of Clinical PharmacologySir Run HospitalNanjing Medical UniversityNanjing 211166China

Pomalidomide is an immunomodulatory agent (IMiD) that has been approved by the US Food and Drug Administration (FDA) for clinical treatment of patients with multiple *** this work,we developed a sensitive and validated LC-MS/MS method for high-throughput determination of pomalidomide over the range of 1.006-100.6 ng/mL(R^(2)=0.9991) in human plasma and pharmacokinetic studies.A liquid-liquid extraction method using ethyl acetate was applied to extract pomalidomide and afatinib (as an internal standard,IS) from human *** separation was performed on a Hedera ODS column (150 mm×2.1 mm,5μm) with security guard C18 column (4 mm×2.0 mm) at 40℃.Methanol and 10 mmol/L aqueous solution of ammonium acetate containing 0.1%formic acid were used as a gradient elution mobile phase,and the flow rate was 0.4 mL/min.A triple quadruple tandem mass spectrometer using multiplex reaction monitoring mode (MRM) with electrospray ionization (ESI) positive ionization was *** precursor to product ion transitions for the quantitative analysis of pomalidomide and the IS were m/z 274.2→163.1 and m/z 486.1→371.1,*** established method has been validated according to regulatory guideline,and the results were all within the acceptance *** validated LC-MS/MS method was successfully applied to analyze samples obtained from clinical pharmacokinetics study after oral administration of pomalidomide (4 mg) capsules in human.

关键词： Pomalidomide Liquid-liquid extraction LC–MS/MS method Pharmacokinetic Human plasma

Selective and asymmetric ion transport in covalent organic framework-based two-dimensional nanofluidic devices

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International Journal of Smart and Nano Materials 2024年第1期15卷 186-197页

作者： Li-Qiu huang Shuang Chen Ri-Jian Mo Zhong-Qiu Li xing-hua xia State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjingChina

Two-dimensional(2D)covalent organic framework(COF)mem-branes featuring well-aligned and programmable vertical nano-channels have emerged as a promising candidate for advanced nanofluidic devices and showcased vast potential in the fields of smart-gating,ion-separation,and ***,the transverse interlayer nanochannels with a height of sub-nanometer-scale in 2D-COF membranes have scarcely been studied in ***,we report the ion transport characteristics in 2D interlayer nanochannels of protonated CoF *** dis-tinct surface-charge-governed ionic conductance in domination of electrolyte concentration below 1o-3 M as well as the exceptional anion/cation(Cl^(-)/K^(+))selectivity is revealed due to the pronounced charge and nano-confinement ***,evident ion current rectification is witnessed when incorporating asymmetric geometry into the system,which is attributed to the dynamic process of ion enrichment and dissipation within the protonated *** work offers immense prospects for 2D-COF membranes in the fields of biomimetic nanofluidic devices and cutting-edge electronic devices.

关键词： Two-dimensional covalent organic framework interlayernanochannels ion transport characteristics nanofluidic device

Surface-phonon-polariton-enhanced photoinduced dipole force for nanoscale infrared imaging

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National Science Review 2024年第5期11卷 227-235页

作者： Jian Li Junghoon Jahng Xuezhi Ma Jing Liang Xue Zhang Qianhao Min xiao-Liang Wang Shuangjun Chen Eun Seong Lee xing-hua xia State Key Lab of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University Hyperspectral Nano-Imaging Team Korea Research Institute of Standards and Science Institute of Materials Research and Engineering Agency for ScienceTechnology and Research College of Materials Science and Engineering Nanjing Tech University

The photoinduced dipole force(Pi DF) is an attractive force arising from the Coulombic interaction between the light-induced dipoles on the illuminated tip and the sample. It shows extreme sample-tip distance and refractive index dependence, which is promising for nanoscale infrared(IR) imaging of ultrathin samples. However, the existence of Pi DF in the mid-IR region has not been experimentally demonstrated due to the coexistence of photoinduced thermal force(Pi TF), typically one to two orders of magnitude higher than Pi DF. In this study, we demonstrate that, with the assistance of surface phonon polaritons, the Pi DF of c-quartz can be enhanced to surpass its Pi TF, enabling a clear observation of Pi DF spectra reflecting the properties of the real part of permittivity. Leveraging the detection of the Pi DF of phonon polaritonic substrate, we propose a strategy to enhance the sensitivity and contrast of photoinduced force responses in transmission images, facilitating the precise differentiation of the heterogeneous distribution of ultrathin samples.

关键词： surface phonon polariton photoinduced dipole force nanoscale infrared imaging ultrathin sample

A Solar Thermoelectric Nanofluidic Device for Solar Thermal Energy Harvesting

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CCS Chemistry 2021年第7期3卷 2174-2182页

作者： Zhong-Qiu Li Zeng-Qiang Wu Xin-Lei Ding Ming-Yang Wu xing-hua xia State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023

Harvesting the low-grade(<100°C)solar thermal energy with ionic heat-to-electricity conversion shows great promise but low efficiencies due to the challenges encountered in regulating ionic thermophoretic ***,we used nanochannels to regulate thermal-driven ion transport properties and described a solar thermoelectric nanofluidic device(STEND).

关键词： solar thermal energy nanochannel surface plasmon resonance charge separation thermoelectric conversion

Atomic force microscopy-based nanoscale infrared techniques for liquid environments

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Science Bulletin 2024年第2期69卷 151-153页

作者： Jian Li Jing Liang Mu-Hao Lan xing-hua xia State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical EngineeringNanjing UniversityNanjing 210023China

Infrared(IR)light energy matches well with the vibration and rotation of chemical bonds in molecules,hence IR spectroscopy is commonly used for accurate molecular identification[1].Conventional IR analysis involves bulk samples,providing averaged information of the entire *** spatially-resolved investigation of heterogeneous sample properties is constrained by the micrometer-level spatial resolution of optical IR microscopy.

关键词： spatially hence rotation