@article{li_lin_ko_kiserow_genzer_2018, title={Visualization of Mechanochemically-Assisted Degrafting of Surface-Tethered Poly(Acrylic Acid) Brushes}, volume={7}, ISSN={["2161-1653"]}, DOI={10.1021/acsmacrolett.8b00241}, abstractNote={We report visualization of mechanochemically assisted degrafting of surface-tethered poly(acrylic acid) (PAA) brushes in a basic aqueous buffer at nanometer to micrometer length scale by monitoring changes in local etching of silicon substrates. PAA brushes were prepared by surface-initiated atom transfer radical polymerization and incubated in 0.1 M ethanolamine buffer (pH 9.0) with 0.5 M NaCl. Morphological changes of the underlying substrates were monitored by scanning electron microscopy and atomic force microscopy. The appearance of regular-shaped pits indicated etching of the substrate, and both their number and size grew with increasing incubation time. We compared the etching behaviors for PAA, poly(methyl methacrylate) (PMMA), and poly(poly(ethylene glycol) methacrylate) (PPEGMA) brushes grafted on silicon substrates. After incubation for 7 days, the substrate of PMMA brush remained intact. In PAA brush systems, we detected the formation of a few large pits whose size grew in time. Many pits showed up on the substrate of PPEGMA brush but with substantially smaller size compared to PAA. Our findings suggest that hydrophobicity and stability of the grafted polymers play an important role in the morphological changes of the underlying silicon substrates under given incubation conditions.}, number={6}, journal={ACS MACRO LETTERS}, author={Li, Yuanchao and Lin, Yiliang and Ko, Yeongun and Kiserow, Douglas and Genzer, Jan}, year={2018}, month={Jun}, pages={609–613} }
 @article{li_roberts_brown_gord_2005, title={Acoustic damping rate measurements in binary mixtures of atomic species via transient-grating spectroscopy}, volume={39}, ISSN={["1432-1114"]}, DOI={10.1007/s00348-005-1012-6}, number={4}, journal={EXPERIMENTS IN FLUIDS}, author={Li, YY and Roberts, WL and Brown, MS and Gord, JR}, year={2005}, month={Oct}, pages={687–693} }
 @article{brown_li_roberts_gord_2003, title={Analysis of transient-rating signals for reacting-flow applications}, volume={42}, ISSN={["2155-3165"]}, DOI={10.1364/AO.42.000566}, abstractNote={Single-shot transient-grating measurements for thermometry in pressurized reacting flows are examined in the context of rapid digital signal processing. Simple approaches are discussed for temperature determination and rejection of unwanted signals in real-time measurement applications. Examples of temperature data in pressurized postflame gases are presented in the form of probability-density functions (PDFs). Three contributions to the PDF half-widths are discussed. Analysis of phase-matching requirements indicates that beam steering as a result of density fluctuations affects the signal amplitude but not the grating period. Therefore, such stochastic beam deviations have little effect on the derived temperatures. Mode noise on the cw probe beam as well as linear light scattering are found to be insignificant in the frequency range of the observed transient-grating acoustic signature. Use of a single-mode laser for the pump beams is shown to enhance the signal intensity.}, number={3}, journal={APPLIED OPTICS}, author={Brown, MS and Li, YY and Roberts, WL and Gord, JR}, year={2003}, month={Jan}, pages={566–578} }
 @article{li_roberts_brown_herring_2003, title={Transient grating spectroscopy with delayed thermalization in non-combusting CO/air mixtures}, volume={226}, ISSN={["0030-4018"]}, DOI={10.1016/j.optcom.2003.08.036}, abstractNote={Transient grating spectroscopy is used to observe slowly forming thermal gratings in a mixture (non-combusting CO/air at ⩽0.7 MPa) of two gases that are individually transparent. Thermalization in the mixture implies a photochemical process at 532 nm that populates the metastable singlet level 1Δg in O2 through collision-assisted absorption in O2 pairs. The laser intensity dependence of this process is measured.}, number={1-6}, journal={OPTICS COMMUNICATIONS}, author={Li, YY and Roberts, WL and Brown, MS and Herring, GC}, year={2003}, month={Oct}, pages={255–258} }
 @article{li_roberts_brown_2002, title={Investigation of gaseous acoustic damping rates by transient grating spectroscopy}, volume={40}, ISSN={["0001-1452"]}, DOI={10.2514/2.1790}, abstractNote={An investigation of acoustic damping ratesin a pressurized gaseous medium by analyzing thetemporal behavior of laser-induced gratings is reported. Experiments were performed in various nonresonant gas samples as a function of pressure and grating spacing. Acoustic damping rates were determined through model e ts to the acquired signals. The results were compared with theoretical calculations using both classical acoustic damping rates and a more comprehensive model that includes rotational and vibrational energy transfer mechanisms. The relationships between the measured acoustic damping rate and molecular structure and pressure and grating spacing are discussed. The utility of exploiting the temporal signature from laser-induced gratings to determine acoustic damping rates in high-pressure gases is identie ed. Nomenclature cp = heat capacity at constant pressure crot = heat capacity of rotational modes cs = local speed of sound cv = heat capacity at constant volume cvib = heat capacity of vibrational modes Dth = thermal diffusivity f = acoustic frequency G = geometric factor I = signal intensity M = molecular weight P = pressure q = grating wave vector, 2 o=3 R = gas constant T = e uid temperature t = time Z = collision number ¯ = damping factor due to energy transfer 0 = acoustic damping coefe cient ° = specie c heat ratio 1n = local modulation in index of refraction ´ = scattering efe ciency of laser-induced grating µ = full angle between beams · = thermal conductivity 3 = grating spacing ¸ = laser wavelength π = dynamic viscosity Ω = e uid density ?rot = rotational relaxation time ?vib = vibrational relaxation time}, number={6}, journal={AIAA JOURNAL}, author={Li, YY and Roberts, WL and Brown, MS}, year={2002}, month={Jun}, pages={1071–1077} }
 @article{li_greenfeder_martin_minnicozzi_voynow_adler_1999, title={Cloning and expression of guinea pig MUC2 and MUC5AC genes.}, volume={159}, journal={American Journal of Respiratory and Critical Care Medicine}, author={Li, Y. and Greenfeder, S. and Martin, L. D. and Minnicozzi, M. and Voynow, J. A. and Adler, K. B.}, year={1999}, pages={A852} }