Relevant bibliographies by topics / Pulsed 1H-NMR

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  2. Dissertations / Theses
  3. Book chapters

Academic literature on the topic 'Pulsed 1H-NMR'

Author: Grafiati
Published: 4 June 2021
Last updated: 13 February 2022

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Journal articles on the topic "Pulsed 1H-NMR"

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SATO, KAZUO. "1H Pulsed NMR." Sen'i Gakkaishi 44, no. 6 (1988): P224—P227. http://dx.doi.org/10.2115/fiber.44.6_p224.

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Haase, J., M. B. Kozlov, A. G. Webb, B. Büchner, H. Eschrig, K. H. Müller, and H. Siegel. "2GHz 1H NMR in pulsed magnets." Solid State Nuclear Magnetic Resonance 27, no. 3 (May 2005): 206–8. http://dx.doi.org/10.1016/j.ssnmr.2004.10.002.

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Fukumori, Kenzo, Norio Sato, and Toshio Kurauchi. "Pulsed NMR Study of Motional Heterogeneity in Acrylonitrile-Butadiene/Poly(Vinyl Chloride) Blends." Rubber Chemistry and Technology 64, no. 4 (September 1, 1991): 522–33. http://dx.doi.org/10.5254/1.3538570.

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Abstract Motional heterogeneity in blends of NBR (AN = 38%) and PVC was studied by 1H pulsed NMR. It was estimated from NMR relaxation measurements that the PVC molecules in the NBR phase form phase domains of the order of less than 10 nm, consistent with the microheterogeneous structure observed by TEM. Furthermore, by spin diffusion experiments using the Goldman-Shen pulse sequence, the size of the PVC phase domains was semiquantitatively evaluated to be 4.2 nm in the case of the cylindrical domains and to be 5.1 nm in the case of the spherical domains. It becomes clear that pulsed NMR complements the results of other analytical methods with more detailed information on the state of the molecular mixing in the blends.
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Rashid, Haroon, Yury Golitsyn, Muhammad Humayun Bilal, Karsten Mäder, Detlef Reichert, and Jörg Kressler. "Polymer Networks Synthesized from Poly(Sorbitol Adipate) and Functionalized Poly(Ethylene Glycol)." Gels 7, no. 1 (February 20, 2021): 22. http://dx.doi.org/10.3390/gels7010022.

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Polymer networks were prepared by Steglich esterification using poly(sorbitol adipate) (PSA) and poly(sorbitol adipate)-graft-poly(ethylene glycol) mono methyl ether (PSA-g-mPEG12) copolymer. Utilizing multi-hydroxyl functionalities of PSA, poly(ethylene glycol) (PEG) was first grafted onto a PSA backbone. Then the cross-linking of PSA or PSA-g-mPEG12 was carried out with disuccinyl PEG of different molar masses (Suc-PEGn-Suc). Polymers were characterized through nuclear magnetic resonance (NMR) spectroscopy, gel permeation chromatography (GPC), and differential scanning calorimetry (DSC). The degree of swelling of networks was investigated through water (D2O) uptake studies, while for detailed examination of their structural dynamics, networks were studied using 13C magic angle spinning NMR (13C MAS NMR) spectroscopy, 1H double quantum NMR (1H DQ NMR) spectroscopy, and 1H pulsed field gradient NMR (1H PFG NMR) spectroscopy. These solid state NMR results revealed that the networks were composed of a two component structure, having different dipolar coupling constants. The diffusion of solvent molecules depended on the degree of swelling that was imparted to the network by the varying chain length of the PEG based cross-linking agent.
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Kozlov, Mikhail B., Jürgen Haase, Christoph Baumann, and Andrew G. Webb. "56T 1H NMR at 2.4GHz in a pulsed high-field magnet." Solid State Nuclear Magnetic Resonance 28, no. 1 (July 2005): 64–67. http://dx.doi.org/10.1016/j.ssnmr.2005.06.003.

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Hemnani, Preeti, A. K. Rajarajan, Gopal Joshi, and S. V. G. Ravindranath. "The Building of Pulsed NQR/NMR Spectrometer." International Journal of Electrical and Computer Engineering (IJECE) 8, no. 3 (June 1, 2018): 1442. http://dx.doi.org/10.11591/ijece.v8i3.pp1442-1450.

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<p>NQR spectrometer designed is composed of four modules; Transmitter, Probe, Receiver and computer controlled (FPGA &amp; Software) module containing frequency synthesizer, synchronous demodulator, pulse programmer and display. The function of the Transmitter module is to amplify the RF pulse sequence to about 200 W power level into the probe (50 Ohm) which is a parallel resonance circuit with a tapped capacitor. The probe excites the nucleus and picks-up the signal emitted from the nuclei. The nuclear signal at the same frequency as the excitation, which is typically in the range of a few microvolts is amplified, demodulated and filtered (1 kHz to 100 kHz) by receiver module. 14N NQR, 1H and 2H NMR signals are observed from the spectrometer.As the SNR of NQR signal is very low, NQR signal processing based on Adaptive Line Enhancement is presented.</p>
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Sun, Y. H., J. C. Xiong, H. Lock, M. L. Buszko, J. A. Haase, and G. E. Maciel. "Solid-State 1H CRAMPS NMR Imaging with Pulsed Rotating Magnetic Field Gradients." Journal of Magnetic Resonance, Series A 110, no. 1 (September 1994): 1–6. http://dx.doi.org/10.1006/jmra.1994.1172.

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Kinmond, E. J., S. R. Coulson, J. P. S. Badyal, S. A. Brewer, and C. Willis. "High structural retention during pulsed plasma polymerization of 1H,1H,2H-perfluorododecene: an NMR and TOF-SIMS study." Polymer 46, no. 18 (August 2005): 6829–35. http://dx.doi.org/10.1016/j.polymer.2005.05.112.

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Herbert-Pucheta, José Enrique, José Daniel Lozada-Ramírez, Ana E. Ortega-Regules, Luis Ricardo Hernández, and Cecilia Anaya de Parrodi. "Nuclear Magnetic Resonance Metabolomics with Double Pulsed-Field-Gradient Echo and Automatized Solvent Suppression Spectroscopy for Multivariate Data Matrix Applied in Novel Wine and Juice Discriminant Analysis." Molecules 26, no. 14 (July 7, 2021): 4146. http://dx.doi.org/10.3390/molecules26144146.

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The quality of foods has led researchers to use various analytical methods to determine the amounts of principal food constituents; some of them are the NMR techniques with a multivariate statistical analysis (NMR-MSA). The present work introduces a set of NMR-MSA novelties. First, the use of a double pulsed-field-gradient echo (DPFGE) experiment with a refocusing band-selective uniform response pure-phase selective pulse for the selective excitation of a 5–10-ppm range of wine samples reveals novel broad 1H resonances. Second, an NMR-MSA foodomics approach to discriminate between wine samples produced from the same Cabernet Sauvignon variety fermented with different yeast strains proposed for large-scale alcohol reductions. Third a comparative study between a nonsupervised Principal Component Analysis (PCA), supervised standard partial (PLS-DA), and sparse (sPLS-DA) least squares discriminant analysis, as well as orthogonal projections to a latent structures discriminant analysis (OPLS-DA), for obtaining holistic fingerprints. The MSA discriminated between different Cabernet Sauvignon fermentation schemes and juice varieties (apple, apricot, and orange) or juice authentications (puree, nectar, concentrated, and commercial juice fruit drinks). The new pulse sequence DPFGE demonstrated an enhanced sensitivity in the aromatic zone of wine samples, allowing a better application of different unsupervised and supervised multivariate statistical analysis approaches.
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Lens, Piet N. L., Rakel Gastesi, Frank Vergeldt, Adriaan C. van Aelst, Antonio G. Pisabarro, and Henk Van As. "Diffusional Properties of Methanogenic Granular Sludge: 1H NMR Characterization." Applied and Environmental Microbiology 69, no. 11 (November 2003): 6644–49. http://dx.doi.org/10.1128/aem.69.11.6644-6649.2003.

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ABSTRACT The diffusive properties of anaerobic methanogenic and sulfidogenic aggregates present in wastewater treatment bioreactors were studied using diffusion analysis by relaxation time-separated pulsed-field gradient nuclear magnetic resonance (NMR) spectroscopy and NMR imaging. NMR spectroscopy measurements were performed at 22°C with 10 ml of granular sludge at a magnetic field strength of 0.5 T (20 MHz resonance frequency for protons). Self-diffusion coefficients of H2O in the investigated series of mesophilic aggregates were found to be 51 to 78% lower than the self-diffusion coefficient of free water. Interestingly, self-diffusion coefficients of H2O were independent of the aggregate size for the size fractions investigated. Diffusional transport occurred faster in aggregates growing under nutrient-rich conditions (e.g., the bottom of a reactor) or at high (55°C) temperatures than in aggregates cultivated in nutrient-poor conditions or at low (10°C) temperatures. Exposure of aggregates to 2.5% glutaraldehyde or heat (70 or 90°C for 30 min) modified the diffusional transport up to 20%. In contrast, deactivation of aggregates by HgCl2 did not affect the H2O self-diffusion coefficient in aggregates. Analysis of NMR images of a single aggregate shows that methanogenic aggregates possess a spin-spin relaxation time and self-diffusion coefficient distribution, which are due to both physical (porosity) and chemical (metal sulfide precipitates) factors.
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Dissertations / Theses on the topic "Pulsed 1H-NMR"

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Vilč, Ladislav. "Vliv teploty a času na podíl krystalické a amorfní fáze v polypropylenu." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2010. http://www.nusl.cz/ntk/nusl-233299.

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is is a study of the relationship between structure, mechanical properties and relaxing behavior of the polypropylene. The structure was evaluated by the quantity the solid phase content (SPC). This was defined as mathematical result of free induction decay (FID) signal from pulsed 1H-NMR. The solid phase content is a quite new structural parameter representing the quantity for description of semi-crystalline polymers. Whereas pulsed 1H-NMR is non-destructive, accurate and repeatable, it becomes a unique tool for a description of mechanical, structural, physical-mechanical changes of polypropylene within the time and temperature. Particularly, this method registers the small changes in the time-dependant shipments during secondary crystallization with small structure changes.
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Merz, Steffen, Peter Jakes, Hermann Tempel, Henning Weinrich, Hans Kungl, Rüdiger-A. Eichel, and Josef Granwehr. "Characterizing Interactions of Ionic Liquid Based Electrolytes with Electrospun Gas Diffusion Electrode Frameworks by 1H PFG NMR." 2017. https://ul.qucosa.de/id/qucosa%3A31595.

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Pulsed field gradient (PFG) 1H NMR was used to characterize the mobility of ionic liquid cations in porous gas diffusion electrode (GDE) frameworks for metal–air electrochemical systems. The carbon GDE frameworks were produced by electrospinning. It was found that the motion of ionic liquids in the highly porous hosts is more complex than what is commonly exhibited by conventional fluids, which makes a multimodal investigation essential for an adequate description of mobility and wetting of GDEs. Observed NMR diffraction-like patterns cannot be linked to the tortuosity limit but may serve as a proxy for structural features in the fibrous material. While the observed data were interpreted using standard theoretical models, alternative explanations and causes for artifacts are discussed.
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Book chapters on the topic "Pulsed 1H-NMR"

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Dybowski, Cecil. "Multiple-Pulse 1H and 19F NMR Techniques." In Solid State NMR of Polymers, 1–21. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4899-2474-2_1.

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Balci, Metin. "Pulse NMR Spectroscopy." In Basic 1H- and 13C-NMR Spectroscopy, 253–81. Elsevier, 2005. http://dx.doi.org/10.1016/b978-044451811-8.50011-5.

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Balci, Metin. "Multiple-Pulse NMR Experiments." In Basic 1H- and 13C-NMR Spectroscopy, 339–75. Elsevier, 2005. http://dx.doi.org/10.1016/b978-044451811-8.50015-2.

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Seco, Josi M., Emilio Quiqoa, and Ricardo Riguera. "Practical Aspects of the Preparation of the Derivatives." In The Assignment of the Absolute Configuration by NMR using Chiral Derivatizing Agents. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199996803.003.0005.

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Most of the NMR spectra shown in this book and in the literature have been recorded at 250 or 300 MHz, with a few being obtained at 500 MHz for 1H NMR (the equivalent for 13C NMR). No special pulse sequences are necessary, just standard one-dimensional (1D) spectra although two-dimensional (2D) experiments (e.g., correlation spectroscopy; COSY) may be necessary in some cases in order to get an unambiguous identification of the signals relevant for the assignment. In general, 5–10 mg or less of CDA derivative dissolved in 0.5 mL of deuterated solvent are sufficient to obtain a good NMR spectrum. Temperature, solvent, and concentration used in the NMR experiments should be adequate for each CDA-substrate pair and methodology, because the method is based on the conformational composition of the AMAA derivatives in precise conditions. With the exception of the low-temperature procedure (single derivatization), a NMR probe temperature around 300 K has always been used. In general, the spectra for double-derivatization assignments should be taken in deuterated chloroform. Different NMR solvents are required only in two of the single-derivatization methods. In the assignment by low-temperature NMR, the most convenient solvent is a CS2/CD2Cl2 (4:1) mixture, which allows the use of temperatures low enough (i.e., 213 K) to obtain relevant shifts. In the procedure based on the complexation with Ba2+, the NMR solvent should be deuterated acetonitrile. The barium salt is anhydrous Ba(ClO4)2, which can be added directly to the tube by using a spatula. No weighing is necessary after shaking, as the excess salt will remain at the bottom of the NMR tube and will not disturb the experiment. (R)- and (S)-MPA, MTPA, and Boc-phenylglycine (BPG) are commercially available and can be used without further purification. The first two (MPA and MTPA) can also be purchased as acid chlorides. When using MTPA or the corresponding acid chloride [85] for the derivatization of an alcohol or amine, it should be noted that the Cahn-Ingold-Prelog priority rules assign different R/S descriptors to the acid and to the corresponding chloride; this is due to the different priority order generated by the substituents [i.e., (R)-MTPA generates the (S)-acid chloride and vice versa].
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Journal articles
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