Kaitlin M. Bratlie
Iowa State University
Self-healing hydrogelsAnalytical chemistryBiophysicsPhenotypeBiomedical engineeringAdsorptionInfrared spectroscopyCatalysisNanotechnologyChemistryMaterials scienceBenzeneBiomaterialMacrophageDrug deliveryWound healingChemical engineeringTissue engineeringPlatinumCell biology
72Publications
22H-index
2,389Citations
Publications 68
Newest
Sum frequency generation (SFG) vibrational spectroscopy was used to investigate the adsorption geometries and surface reactions of various C 6 hydrocarbons (n-hexane, 2-methylpentane, 3-methylpentane, and 1-hexene) on Pt(100). At 300 K and in the presence of excess hydrogen, n-hexane, 3-methylpentane, and 2-methylpentane adsorb molecularly on Pt(100) mostly in "flat-lying" conformations. Upon heating the metal surface to 450 K, the molecules underwent dehydrogenation to form new surface species ...
6 CitationsSource
#1A. M. Contreras (University of California, Berkeley)H-Index: 8
#2Max Montano (University of California, Berkeley)H-Index: 7
Last. Gabor A. Somorjai (University of California, Berkeley)H-Index: 158
view all 7 authors...
Surface science studies of heterogeneous catalysis use model systems ranging from single crystals to monodispersed nanoparticles in the 1–10 nm range. Molecular studies reveal that bond activation (C–H, H–H, C–C, C≡O) occurs at 300 K or below as the active metal sites simultaneously restructure. The strongly adsorbed molecules must be mobile to free up these sites for continued turnover of reaction. Oxide–metal interfaces are also active for catalytic turnover. Examples using C–H and C = O activ...
3 CitationsSource
#1Kaitlin M. BratlieH-Index: 22
#2Max MontanoH-Index: 7
Last. Gabor A. Somorjai (University of California, Berkeley)H-Index: 158
view all 5 authors...
Sum frequency generation (SFG) vibrational spectroscopy and high-pressure scanning tunneling microscopy (HP-STM) have been used in combination for the first time to study a catalytic reaction. These techniques have been able to identify surface intermediates in situ during benzene hydrogenation on a Pt(111) single-crystal surface at Torr pressures. In a background of 10 Torr of benzene, STM is able to image small ordered regions corresponding to the c(2√3 × 3)rect structure in which each molecul...
27 CitationsSource
#1Max Montano (University of California, Berkeley)H-Index: 7
#2Kaitlin M. BratlieH-Index: 22
Last. Gabor A. SomorjaiH-Index: 158
view all 4 authors...
Catalytic hydrogen/deuterium exchange on a platinum (111) single crystal and its poisoning with carbon monoxide was studied using scanning tunneling microscopy (STM), X-ray photoelectron spectroscopy (XPS), sum frequency generation vibrational spectroscopy (SFG), and mass spectrometry under reaction conditions at pressures in the mTorr to atmospheric range. At 298 K and in the presence of 200 mTorr of hydrogen and 20 mTorr of deuterium the surface is catalytically active, producing HD with activ...
87 CitationsSource
#1Kaitlin M. Bratlie (University of California, Berkeley)H-Index: 22
Last. Gabor A. SomorjaiH-Index: 158
view all 3 authors...
Sum frequency generation (SFG) surface vibrational spectroscopy and kinetic measurements using gas chromatography have identified at least two reaction pathways for benzene hydrogenation on the Pt(100) and Pt(111) single-crystal surfaces at Torr pressures. Kinetic studies at low temperatures (310−370 K) show that benzene hydrogenation does not proceed through cyclohexene. A Langmuir−Hinshelwood-type rate law for the low-temperature reaction pathway is identified. The rate-determining step for th...
80 CitationsSource
#1Gabor A. Somorjai (University of California, Berkeley)H-Index: 158
#2Kaitlin M. BratlieH-Index: 22
Last. Jeong Young ParkH-Index: 62
view all 4 authors...
The mechanism that controls bond breaking at transition metal surfaces has been studied with sum frequency generation (SFG), scanning tunneling microscopy (STM), and catalytic nanodiodes operating under the highpressure conditions. The combination of these techniques permits us to understand the role of surface defects, surface diffusion, and hot electrons in dynamics of surface catalyzed reactions. Sum frequency generation vibrational spectroscopy and kinetic measurements were performed under 1...
64 CitationsSource
Sum frequency generation surface vibrational spectroscopy and kinetic measurements using gas chromatography have been used to identify a reactive surface intermediate in situ during hydrogenation of benzene on a Pt(111) single crystal surface at Torr pressures. Upon adsorption at 310 K, both chemisorbed and physisorbed benzene coexist on the surface, a result which has not previously been observed. Kinetic measurements show a linear compensation effect for the production of both cyclohexane and ...
19 CitationsSource
#1Kaitlin M. Bratlie (University of California, Berkeley)H-Index: 22
#2Lucio D. Flores (University of California, Berkeley)H-Index: 3
Last. Gabor A. Somorjai (University of California, Berkeley)H-Index: 158
view all 3 authors...
Abstract Sum frequency generation (SFG) vibrational spectroscopy and kinetic measurements were performed during cyclohexene hydrogenation/dehydrogenation over a range of pressures (10 −8 –5 Torr) and temperatures (300–500 K) on the Pt(1 0 0) surface. Upon adsorption at pressures below 1.5 Torr and at 300 K, cyclohexene dehydrogenates to form π-allyl c-C 6 H 9 and hydrogenates to form cyclohexyl (C 6 H 11 ) surface intermediates. Increasing the pressure to 1.5 Torr produces adsorbed 1,4-cyclohexa...
30 CitationsSource