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Experimental and computational study of a new wheel-shaped {[W5O21]3[(U(VI)O))2(μ-O2)]3}30- polyoxometalate.

Inorganic chemistry

Miró P, Ling J, Qiu J, Burns PC, Gagliardi L, Cramer CJ.
PMID: 22857707
Inorg Chem. 2012 Aug 20;51(16):8784-90. doi: 10.1021/ic3005536. Epub 2012 Aug 02.

A new wheel-shaped polyoxometalate {[W(5)O(21)](3)[(U(VI)O(2))(2)(μ-O(2))](3)}(30-) has been synthesized and structurally characterized. The calculated electrostatic potential reveals the protonation of several μ-oxo bridges reducing the polyoxometalate total charge. A protonated structure computed at the density functional level of theory (DFT)...

Stripe-like nanoscale structural phase separation in superconducting BaPb(1-x)Bi(x)O3.

Nature communications

Giraldo-Gallo P, Zhang Y, Parra C, Manoharan HC, Beasley MR, Geballe TH, Kramer MJ, Fisher IR.
PMID: 26373890
Nat Commun. 2015 Sep 16;6:8231. doi: 10.1038/ncomms9231.

The phase diagram of BaPb(1-x)Bi(x)O3 exhibits a superconducting dome in the proximity of a charge density wave phase. For the superconducting compositions, the material coexists as two structural polymorphs. Here we show, via high-resolution transmission electron microscopy, that the...

High-bandwidth transfer of phase stability through a fiber frequency comb.

Optics express

Scharnhorst N, Wübbena JB, Hannig S, Jakobsen K, Kramer J, Leroux ID, Schmidt PO.
PMID: 26367634
Opt Express. 2015 Jul 27;23(15):19771-6. doi: 10.1364/OE.23.019771.

We demonstrate phase locking of a 729 nm diode laser to a 1542 nm master laser via an erbium-doped-fiber frequency comb, using a transfer-oscillator feedforward scheme which suppresses the effect of comb noise in an unprecedented 1.8 MHz bandwidth....

'Crystal Genes' in Metallic Liquids and Glasses.

Scientific reports

Sun Y, Zhang F, Ye Z, Zhang Y, Fang X, Ding Z, Wang CZ, Mendelev MI, Ott RT, Kramer MJ, Ho KM.
PMID: 27030071
Sci Rep. 2016 Mar 31;6:23734. doi: 10.1038/srep23734.

We analyze the underlying structural order that transcends liquid, glass and crystalline states in metallic systems. A genetic algorithm is applied to search for the most common energetically favorable packing motifs in crystalline structures. These motifs are in turn...

Applications and limitations of electron correlation microscopy to study relaxation dynamics in supercooled liquids.

Ultramicroscopy

Zhang P, He L, Besser MF, Liu Z, Schroers J, Kramer MJ, Voyles PM.
PMID: 27638332
Ultramicroscopy. 2017 Jul;178:125-130. doi: 10.1016/j.ultramic.2016.09.001. Epub 2016 Sep 08.

Electron correlation microscopy (ECM) is a way to measure structural relaxation times, τ, of liquids with nanometer-scale spatial resolution using coherent electron scattering equivalent of photon correlation spectroscopy. We have applied ECM with a 3.5nm diameter probe to Pt

Excited-State Absorption from Real-Time Time-Dependent Density Functional Theory: Optical Limiting in Zinc Phthalocyanine.

The journal of physical chemistry letters

Fischer SA, Cramer CJ, Govind N.
PMID: 27007445
J Phys Chem Lett. 2016 Apr 07;7(7):1387-91. doi: 10.1021/acs.jpclett.6b00282. Epub 2016 Mar 28.

Optical-limiting materials are capable of attenuating light to protect delicate equipment from high-intensity light sources. Phthalocyanines have attracted a lot of attention for optical-limiting applications due to their versatility and large nonlinear absorption. With excited-state absorption (ESA) being the...

Predicting amyloid status in corticobasal syndrome using modified clinical criteria, magnetic resonance imaging and fluorodeoxyglucose positron emission tomography.

Alzheimer's research & therapy

Sha SJ, Ghosh PM, Lee SE, Corbetta-Rastelli C, Jagust WJ, Kornak J, Rankin KP, Grinberg LT, Vinters HV, Mendez MF, Dickson DW, Seeley WW, Gorno-Tempini M, Kramer J, Miller BL, Boxer AL, Rabinovici GD.
PMID: 25733984
Alzheimers Res Ther. 2015 Mar 02;7(1):8. doi: 10.1186/s13195-014-0093-y. eCollection 2015.

INTRODUCTION: Group comparisons demonstrate greater visuospatial and memory deficits and temporoparietal-predominant degeneration on neuroimaging in patients with corticobasal syndrome (CBS) found to have Alzheimer's disease (AD) pathology versus those with underlying frontotemporal lobar degeneration (FTLD). The value of these...

Correlation Between Partial Pressure of Arterial Carbon Dioxide and End Tidal Carbon Dioxide in Patients with Severe Alcohol Withdrawal.

The Ochsner journal

Yousuf T, Brinton T, Kramer J, Khan B, Ziffra J, Villines D, Shah P, Hanif T.
PMID: 26730226
Ochsner J. 2015;15(4):418-22.

BACKGROUND: Respiratory depression is a common adverse effect of benzodiazepine administration to patients with severe alcoholic withdrawal. This study was conducted to assess the value of end tidal carbon dioxide (ETCO2) levels compared to partial pressure of arterial carbon...

Length-Dependent Nanotransport and Charge Hopping Bottlenecks in Long Thiophene-Containing π-Conjugated Molecular Wires.

Journal of the American Chemical Society

Smith CE, Odoh SO, Ghosh S, Gagliardi L, Cramer CJ, Frisbie CD.
PMID: 26575438
J Am Chem Soc. 2015 Dec 23;137(50):15732-41. doi: 10.1021/jacs.5b07400. Epub 2015 Dec 10.

Self-assembled conjugated molecular wires containing thiophene up to 6 nm in length were grown layer-by-layer using click chemistry. Reflection-absorption infrared spectroscopy, ellipsometry and X-ray photoelectron spectroscopy were used to follow the stepwise growth. The electronic structure of the conjugated...

Mechanism of the Polymerization of rac-Lactide by Fast Zinc Alkoxide Catalysts.

Inorganic chemistry

Stasiw DE, Luke AM, Rosen T, League AB, Mandal M, Neisen BD, Cramer CJ, Kol M, Tolman WB.
PMID: 29116765
Inorg Chem. 2017 Nov 20;56(22):14366-14372. doi: 10.1021/acs.inorgchem.7b02544. Epub 2017 Nov 08.

The ring-opening transesterification polymerization (ROTEP) of rac-lactide (rac-LA) using L

Computational electrochemistry: prediction of liquid-phase reduction potentials.

Physical chemistry chemical physics : PCCP

Marenich AV, Ho J, Coote ML, Cramer CJ, Truhlar DG.
PMID: 24958074
Phys Chem Chem Phys. 2014 Aug 07;16(29):15068-106. doi: 10.1039/c4cp01572j. Epub 2014 Jun 24.

This article reviews recent developments and applications in the area of computational electrochemistry. Our focus is on predicting the reduction potentials of electron transfer and other electrochemical reactions and half-reactions in both aqueous and nonaqueous solutions. Topics covered include...

Polarization Effects in Aqueous and Nonaqueous Solutions.

Journal of chemical theory and computation

Marenich AV, Olson RM, Chamberlin AC, Cramer CJ, Truhlar DG.
PMID: 26636201
J Chem Theory Comput. 2007 Nov;3(6):2055-67. doi: 10.1021/ct7001539.

Polarization effects in aqueous and nonaqueous solutions were analyzed for nine neutral and three charged organic solutes by the SM8 universal implicit solvation model and class IV partial atomic charges based on Charge Model 4M (CM4M) with the M06-2X...

Showing 1 to 12 of 800 entries