A5027568535- Mass Spectrometry Techniques and Applications
- Laser-induced spectroscopy and plasma
- Atmospheric chemistry and aerosols
- Atomic and Molecular Physics
- Microfluidic and Capillary Electrophoresis Applications
- Analytical Chemistry and Chromatography
- Advanced Chemical Sensor Technologies
- Cold Atom Physics and Bose-Einstein Condensates
- Analytical chemistry methods development
- Luminescence Properties of Advanced Materials
- Atmospheric Ozone and Climate
- Electrohydrodynamics and Fluid Dynamics
- Advanced Nanomaterials in Catalysis
- Ion-surface interactions and analysis
- Luminescence and Fluorescent Materials
- Atmospheric aerosols and clouds
- Molecular Sensors and Ion Detection
- Metabolomics and Mass Spectrometry Studies
- Mercury impact and mitigation studies
- Nuclear physics research studies
- Magnetic confinement fusion research
- Air Quality Monitoring and Forecasting
- Air Quality and Health Impacts
- Advanced Chemical Physics Studies
- Lanthanide and Transition Metal Complexes
Federal Institute For Materials Research and Testing
2018-2025
Inner Mongolia Electric Power (China)
2024
Kent State University
2013-2024
Shanghai Jiao Tong University
2024
Southwest University of Science and Technology
2023
East China Normal University
2019-2021
Taiyuan University of Technology
2018
Xiamen University
2017
Fuzhou University
2015
State Council of the People's Republic of China
2015
Abstract. We report measurements of ambient amines and ammonia with a fast response chemical ionization mass spectrometer (CIMS) in southeastern US forest moderately polluted midwestern site during the summer. At site, mostly C3-amines (from pptv to tens pptv) (up 2 ppbv) were detected, they both showed temperature dependencies. Aerosol-phase measured thermal-desorption (TDCIMS) higher fraction evening cooler temperatures lower afternoon warmer temperatures, trend opposite gas-phase amines....
The azide anion as an energy acceptor and electron donor has been introduced into a metal-viologen compound to form 2D layered viologen-based trifunctional material, which exhibits the rare discolored function of reversible photochromism thermochromism. Interestingly, its fluorescence can be switched by visible light irradiation heating in air.
Upconversion photoluminescence in hetero-oligonuclear metal complex architectures featuring organic ligands is an interesting but still rarely observed phenomenon, despite its great potential from a basic research and application perspective. In this context, new photonic material consisting of molecular chromium(III) ytterbium(III) ions was developed that exhibits excitation-power density-dependent cooperative sensitization the chromium-centered 2 E/2 T1 phosphorescence at approximately 775...
Particle Investigations at a Northern Ozarks Tower: NOx, Oxidant, Isoprene Research (PINOT NOIR) were conducted in Missouri forest dominated by isoprene emissions from May to October 2012. This study presents results of new particle formation (NPF) and the growth particles cloud condensation nuclei (CCN)-active sizes (∼100 nm) observed during this field campaign. The measured sub-5 nm up ∼20,000 cm−3 typical NPF event. Nucleation rates J1 relatively high (11.0 ± 10.6 s−1), one order...
Abstract We studied the dissolution behavior of β NaYF 4 :Yb(20%), Er(2%) UCNP two different sizes in biologically relevant media i.e., water (neutral pH), phosphate buffered saline (PBS), and Dulbecco’s modified Eagle medium (DMEM) at temperatures particle concentrations. Special emphasis was dedicated to assess influence surface functionalizations, particularly potential mesoporous microporous silica shells thicknesses for stabilization protection. Dissolution quantified electrochemically...
Ion optics are crucial for spectrometric methods such as mass spectrometry (MS) and ion mobility (IMS). Among the wide selection of optics, temporal gates particular importance time-of-flight MS (TOF-MS) drift-tube IMS. Commonly implemented electrostatic gates, these offer a rapid, efficient means to block beams form discrete packets subsequent analysis. Unfortunately, devices rely on pulsed high voltage sources not fully transparent, even in their open state, which can lead losses...
Anomalously high (up to +8°C) and low (−2°C) groundwater temperatures, as compared undisturbed geothermal profiles, have been observed in unconsolidated siliciclastic aquifers off‐set by normal‐faults the Lower Rhine Embayment, Germany. High hydraulic head gradients, induced pumping, over same faults suggest that they form effective barriers lateral flow. Numerical analysis of data presented here shows thermal anomalies can be explained under assumption a sub‐vertical pathway is connecting...
Plasma-based ambient desorption/ionization sources are versatile in that they enable direct ionization of gaseous samples as well analytes from liquid and solid samples. However, matrix effects, caused by competitive processes, can worsen sensitivity or even inhibit detection all together. The present study is focused on expanding the analytical capabilities flowing atmospheric-pressure afterglow (FAPA) source exploring additional types chemistry. Specifically, it was found abundance type...
Myeloperoxidase (MPO) is a heme peroxidases protein associated with many inflammation-related diseases. Although fluorescent probes have been constructed for the assessment of MPO activity, it still remains challege to develop nanoprobe highly sensitive biosensing and high-resolution bioimaging in biological system. In this work, we developed novel luminescent based on upconversion nanoparticles (UCNPs) conjugated phycocyanin (PC), which could detect fluctuation MPO. By grafting PC onto...
Abstract Direct measurements of atmospheric sub‐3 nm particles are crucial for understanding the new particle formation mechanisms, but such very limited at present. We report sub‐3nm Brookhaven, New York (a coastal site in summer) and Kent, Ohio continental winter). During daytime, approximately 80% observation days both sites, events were observed with concentrations 2800 ± 1600 cm‐ 3 , they appeared elevated sulfuric acid concentrations. nighttime under marine air mass influences, there...
The concept of direct mass-spectrometric analysis, especially exploited by ambient desorption/ionization (ADI) methods, provides numerous means for convenient sample analysis. While many simple and versatile ionization sources have been developed, challenges lay in achieving efficient introduction. In previous work, a introduction method employing current corona discharge (CD) coupled to surface acoustic wave nebulization (SAWN) device enhanced sampling performance both polar nonpolar...
The combination of acoustically levitated droplets, mid-IR laser evaporation, and subsequent post-ionization by secondary electrospray ionization was applied for monitoring the enzymatic digestion various proteins. Acoustically droplets are an ideal, wall-free model reactor, readily allowing compartmentalized microfluidic trypsin digestions. Time-resolved interrogation yielded real-time information on progress reaction thus provided insights into kinetics. After 30 min in acoustic levitator,...
Aminiums are significant components of organic aerosols with intense research on aliphatic aminiums. However, the mechanisms formation aromatic aminiums in urban remain elusive. Highly time-resolved PM2.5 samples were collected center Shanghai (China) during winter to investigate origin and The dominant aminium groups (mainly dimethylaminium monomethylaminium). Anilinium was third most abundant aminium. concentrations anilinium total showed higher levels daytime weekdays. This finding...
Many ambient desorption/ionization mass spectrometry (ADI-MS) techniques rely critically on thermal desorption. Meanwhile, the analyte classes that are successfully studied by any particular ADI-MS methods strongly dependent type of ionization source. Generally, spray-based sources favor polar analytes, whereas plasma-based can be used for more hydrophobic analytes and suitable molecules with small molar masses. In present work, classic atmospheric-pressure chemical (APCI) is used. To...
Abstract Photonen‐Aufkonvertierung in hetero‐oligonuklearen, Metallkomplex‐Architekturen mit organischen Liganden ist ein interessantes, aber bisher selten beobachtetes Phänomen, trotz des großen Potentials sowohl aus Sicht der Grundlagenforschung als auch Anwendungsperspektive. Nun wurde neues photonisches Material molekularen Chrom(III)‐ und Ytterbium(III)‐Komplexionen entwickelt. Dieses zeigt im Festkörper bei Raumtemperatur abhängig von Anregungsleistungsdichte nach Anregung 2 F 7/2 →...
A combination of acoustic levitation, laser vaporization, and atmospheric pressure chemical ionization mass spectrometry (APCI-MS) is presented in this study that enabled sensitive analysis pharmaceutical drugs from an aqueous sample matrix. An unfocused pulsed infrared provided contactless desorption the droplets trapped inside levitator by activation OH stretching band alcoholic solvents. Subsequent was used between levitated droplet spectrometer for postionization. In setup, gently...
Abstract To extend the practicability of ceramics in immobilizing nuclear waste with fluctuant composition, structural design should be abandoned. The simulated tetravalent actinide An 4+ (Ce ) was directly doped into prepared Gd 2 Zr O 7 , and forms were synthesized by high‐temperature solid‐state reaction. It has been shown that maximum loading CeO lies between 20 30 wt.%, Ce elements are uniformly distributed matrix. Existing 3+ cerium ions automatically occupied both sites according to...
The effects of oxygen addition on a helium-based flowing atmospheric pressure afterglow (FAPA) ionization source are explored. Small amounts doped into the helium discharge gas resulted in an increase abundance protonated water clusters by at least three times. A corresponding analyte signal was also observed for small polar analytes, such as methanol and acetone. Meanwhile, most other reagent ions (e.g., O2+·, NO+, etc.) significantly decrease with even 0.1% v/v gas. Interestingly, when...
The ability to controllably move gaseous ions is an essential aspect of ion-based spectrometry (e.g., mass and ion mobility spectrometry) as well materials processing. At higher pressures, motion largely governed by diffusion multiple collisions with neutral gas molecules. Thus, high-pressure optics based on electrostatics require large fields, radio frequency drives, complicated geometries, and/or partially transmissive grids that become contaminated. Here, we demonstrate low-power standing...
An airborne high repetition rate laser-induced plasma was applied as a versatile ambient ionization source for mass-spectrometric determinations of polar and nonpolar analytes in solution. The laser sustained between home-built pneumatic nebulizer the inlet capillary an Orbitrap mass spectrometer. To maintain stable conditions droplet-rich spray environment, directly fed by fundamental output (λ = 1064 nm) current state-of-the-art diode-pumped solid-state laser. Ionization laser-driven...
Abstract. We report ambient measurements of amines and ammonia with a~fast response chemical ionization mass spectrometer (CIMS) in a southeastern US forest Alabama a~moderately polluted Midwestern site during the summer. In forest, mostly C3-amines (from pptv to tens pptv) (up 2 ppbv) were detected on daily basis. showed similar diurnal trends temperature wind direction dependences, not associated transported CO SO2 plumes. Consistent amine gas aerosol phases opposite trends, indicating...
A spatial heterodyne spectrometer (SHS) was combined with a flame atomic absorption (FAA) setup to reveal the analytical potential of SHS be used as tool for high-resolution studies.