Search Results - "Acosta, R H"

Diffusion measurements with continuous hydrogenation in PHIP by Bussandri, S., Buljubasich, L., Acosta, R.H.

“…[Display omitted] •Diffusion experiments in highly diluted samples with sensitivity boost are shown.•Main drawbacks with the technique are addressed by means…”
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Radiofrequency encoded Only Parahydrogen SpectroscopY by Bussandri, S., Acosta, R.H., Buljubasich, L.

“…[Display omitted] •OPSY with only radiofrequency fields (REOPSY) is introduced for PHIP.•Spatial dependence of r.f. fields is used to filter out thermal…”
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Discrimination of PHIP Signals Through their Evolution in Multipulse Sequences by Bussandri, S., Franzoni, M. B., Buljubasich, L., Acosta, R. H.

“…The antiphase character of the PHIP associated signals after a hydrogenation reaction is particularly sensitive to line broadening introduced by magnetic field…”
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Combination of OPSY and PhD-PHIP results in enhanced sensitivity in PHIP by Bussandri, S., Buljubasich, L., Acosta, R.H.

“…[Display omitted] •Large amount of non-reacted molecules in diluted samples limit PHIP hyperpolarization.•Sensitivity and resolution enhancement is achieved by…”
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Diffusion in binary gas mixtures studied by NMR of hyperpolarized gases and molecular dynamics simulations by Acosta, R H, Agulles-Pedrós, L, Komin, S, Sebastiani, D, Spiess, H W, Blümler, P

“…The dependence of the individual mean square displacement of rare gases in binary mixtures is studied by a combined experimental and theoretical approach. We…”
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Contribution of Entanglements to Polymer Network Elasticity by Campise, F, Agudelo, D. C, Acosta, R. H, Villar, M. A, Vallés, E. M, Monti, G. A, Vega, D. A

“…Trapped entanglements, cross-linker functionality, and elastically effective chains are the sources of elasticity of polymer networks and gels. However,…”
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Influence of the incorporation of fibers in biscuit dough on proton mobility characterized by time domain NMR by Serial, M.R., Blanco Canalis, M.S., Carpinella, M., Valentinuzzi, M.C., León, A.E., Ribotta, P.D., Acosta, R.H.

“…•Replacement of a low percentage of flour with inulin renders high quality biscuits.•Dough spreading during baking is related to changes in water mobility.•Oat…”
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Optimized phases for the acquisition of J-spectra in coupled spin systems for thermally and PHIP polarized molecules by Bussandri, S., Prina, I., Acosta, R.H., Buljubasich, L.

“…[Display omitted] •Different phase schemes for refocusing pulses in CPMG-like sequences are studied.•Experiments and simulations with thermally- and PHIP…”
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Contribution of Linear Guest and Structural Pendant Chains to Relaxational Dynamics in Model Polymer Networks Probed by Time-Domain 1H NMR by Campise, F, Roth, L. E, Acosta, R. H, Villar, M. A, Vallés, E. M, Monti, G. A, Vega, D. A

“…A series of end-linked polymer networks with varying contents of linear guest chains were investigated through swelling and time-domain NMR temperature…”
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Effects of Fat and Sugar on Dough and Biscuit Behaviours and their Relationship to Proton Mobility Characterized by TD-NMR by Blanco Canalis, M. S., Valentinuzzi, M. C., Acosta, R. H., León, A. E., Ribotta, P. D.

“…This study aimed to analyse the effect of large variations in fat and sucrose contents of biscuit formulation on dough rheology, biscuit quality and proton…”
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Parahydrogen discriminated PHIP at low magnetic fields by Prina, I., Buljubasich, L., Acosta, R.H.

“…[Display omitted] •PASADENA signal cancellation in an inhomogeneous field of ∼0.5Tesla is studied.•Signals are acquired with a CPMG echo train in a TD…”
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High-Resolution Hyperpolarized J‑Spectra with Parahydrogen Discrimination by Prina, I, Buljubasich, L, Acosta, R. H

“…Parahydrogen-induced polarization (PHIP) has become a powerful tool not only to overcome the low intrinsic sensitivity of nuclear magnetic resonance (NMR) but…”
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High resolution para-hydrogen induced polarization in inhomogeneous magnetic fields by Buljubasich, L., Prina, I., Franzoni, M.B., Münnemann, K., Spiess, H.W., Acosta, R.H.

“…[Display omitted] ► The problem of PASADENA’s signal cancellation in inhomogeneous field is tackled. ► Signals are acquired with a CPMG echo train, thus…”
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Facilitated proton transfer across liquid|liquid interfaces under forced hydrodynamic conditions. Determination of partition coefficients of neutral weak bases by Vega Mercado, F., Ovejero, J.M., Zanotto, F.M., Serial, M.R., Velasco, M.I., Fernández, R.A., Acosta, R.H., Dassie, S.A.

“…A novel quantitative methodology to determine the partition coefficients of neutral weak bases is developed. This new electrochemical approach is based on the…”
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Resolution enhancement in MRI of laser polarized 3He by control of diffusion by Agulles-Pedrós, L., Acosta, R.H., Blümler, P., Spiess, H.W.

“…Diffusion of atoms or molecules in presence of magnetic field gradients not only attenuates the NMR signal but also leads to distortions close to restricting…”
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NMR dipolar constants of motion in liquid crystals: Jeener–Broekaert, double quantum coherence experiments and numerical calculation on a 10-spin cluster by Segnorile, H.H., Bonin, C.J., González, C.E., Acosta, R.H., Zamar, R.C.

“…Two proton quasi-equilibrium states were previously observed in nematic liquid crystals, namely the S and W quasi-invariants. Even though the experimental…”
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Molecular dynamics above the smectic A-isotropic phase transition of thermotropic liquid crystals studied by NMR by Vaca Chávez, F., Acosta, R.H., Pusiol, D.J.

“…This Letter presents a proton fast field cycling Nuclear Magnetic Resonance study of the molecular dynamics in the region above the smectic A-isotropic phase…”
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Experimental NMR spin-lattice relaxometry study in the liquid crystalline nematic phase of propylcyano-phenylcyclohexane by Acosta, R H, Pusiol, D J

“…The NMR spin-lattice proton relaxation dispersion T1(nu(L)) of the liquid crystal propylcyano-phenylcyclohexane is studied over several decades of Larmor…”
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NMR proton spin dynamics in thermotropic liquid crystals subject to multipulse excitation by Acosta, R H, Zamar, R C, Monti, G A

“…Previous experiments of NMR spin-lattice relaxation times as a function of the Larmor frequency, as measured with the field-cycling technique (FC), were shown…”
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Contribution of Linear Guest and Structural Pendant Chains to Relaxational Dynamics in Model Polymer Networks Probed by Time-Domain 1 H NMR by Campise, F., Roth, L. E., Acosta, R. H., Villar, M. A., Vallés, E. M., Monti, G. A., Vega, D. A.

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