A5040533014- Atmospheric chemistry and aerosols
- Luminescence Properties of Advanced Materials
- Atmospheric Ozone and Climate
- Gas Sensing Nanomaterials and Sensors
- Cellular Mechanics and Interactions
- Air Quality Monitoring and Forecasting
- Mechanical and Optical Resonators
- Skin and Cellular Biology Research
- Connective tissue disorders research
- Catalytic Processes in Materials Science
- Analytical chemistry methods development
- Spectroscopy and Laser Applications
- High-pressure geophysics and materials
- Photoreceptor and optogenetics research
- Air Quality and Health Impacts
- Impact of Light on Environment and Health
- Diamond and Carbon-based Materials Research
- Analytical Chemistry and Sensors
- Planarian Biology and Electrostimulation
- Genetics, Aging, and Longevity in Model Organisms
- Analytical Chemistry and Chromatography
Stanford University
2020-2025
Harvey Mudd College
2017-2022
The effects of methylglyoxal uptake on the physical and optical properties aerosol containing amines or ammonium sulfate were determined before after cloud processing in a temperature- RH-controlled chamber. formation brown carbon was observed upon addition, detected as an increase water-soluble organic mass absorption coefficients below 370 nm drop single-scattering albedo at 450 nm. imaginary refractive index component k450 reached maximum value 0.03 ± 0.009 with aqueous glycine particles....
Lanthanide nanoparticles (LNPs) are promising sensors of chemical, mechanical, and temperature changes; they combine the narrow-spectral emission long-lived excited states individual lanthanide ions with high spatial resolution controlled energy transfer nanocrystalline architectures. Despite considerable progress in optimizing LNP brightness responsiveness for dynamic sensing, detection stimuli a approaching that remains an outstanding challenge. Here, we highlight existing capabilities...
Upconverting nanoparticles (UCNPs) are an emerging platform for mechanical force sensing at the nanometer scale. An outstanding challenge in realizing nanometer-scale mechano-sensitive UCNPs is maintaining a high responsivity conjunction with bright optical emission. This Letter reports mechano-sensing based on lanthanide dopants Yb3+ and Er3+, which exhibit strong ratiometric change emission spectra under applied pressure. We synthesize analyze pressure response of five different types...
Glycolaldehyde (GAld) is a C2 water-soluble aldehyde produced during the atmospheric oxidation of isoprene and many other species commonly found in cloudwater. Previous work has established that glycolaldehyde evaporates more readily from drying aerosol droplets containing ammonium sulfate (AS) than does glyoxal, methylglyoxal, or hydroxyacetone, which implies it not oligomerize as quickly these species. Here, we report NMR measurements glycolaldehyde's aqueous-phase reactions with AS,...
Abstract. Oxidation flow reactors (OFRs) are an emerging technique for studying the formation and oxidative aging of organic aerosols other applications. In these reactors, hydroxyl radicals (OH), hydroperoxyl (HO2), nitric oxide (NO) typically produced in following ways: photolysis ozone (O3) at λ=254 nm, H2O λ=185 via reactions O(1D) with nitrous (N2O); is formed O3 nm and/or N2O nm. Here, we adapt a complementary method that uses alkyl nitrite as source OH its production HO2 NO followed...
We measure the color ratio-metric response of alkaline-earth rare-earth upconverting nanoparticles with a diamond anvil cell. find ensembles SrLuF particles detect 32.8 MPa in pressure change corresponding to 24 nN force.
Abstract. Oxidation flow reactors (OFRs) are an emerging technique for studying the formation and oxidative aging of organic aerosols other applications. In these reactors, hydroxyl radicals (OH), hydroperoxyl (HO2), nitric oxide (NO) typically produced in following ways: photolysis ozone (O3) at λ = 254 nm, H2O 185 via reactions O(1D) with nitrous (N2O); is formed O3 nm and/or N2O nm. Here, we adapt a complementary method that uses alkyl nitrite as source OH its production HO2 NO followed by...