Fluorine-19 NMR

Brey, Wallace S.; Brey, Mary Louise

doi:10.1002/9780470034590.emrstm0170.pub2

Cited by 16 publications

(18 citation statements)

References 103 publications

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“…This test was conducted because sinusoidal strains with walking frequencies from 0.5 to 1.0 Hz are frequently used for bone regeneration, since human locomotion is similar to a sinusoidal curve [2,9]. The 3D PCL/PLGA/TCP scaffolds were fabricated to suit bone regeneration in critical-size rat calvarial defect models [34][35][36][37]. The inorganic component of native bone tissue (TCP) was incorporated within the scaffolds because it is known to promote integration with host bone tissue [38,39].…”

Section: Discussionmentioning

confidence: 99%

Flexure-Based Device for Cyclic Strain-Mediated Osteogenic Differentiation

Kang

Jeong

Hong

et al. 2013

Journal of Biomechanical Engineering

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Biophysical strain has been applied widely for bone regeneration. However, application of low-magnitude strains to cells on small-thickness scaffolds is problematic, especially in rodent calvarial defect models, because general translation systems have limitations in terms of generating low-magnitude smooth signals. To overcome these limitations, we developed an in vitro biophysical-stimulation platform for stimulation of cells on small-thickness scaffolds for rodent calvarial bone defects. The customized flexure-based translational nanoactuator enables generation of low-magnitude smooth signals at the subnano- to micrometer-scale. This nanoactuator, which is equipped with a piezoelectric actuator, is suitable for biological applications because it can generate friction-free motion with a high resolution. Moreover, its operation without wear or deterioration eliminates contamination factors in cell culture environments. The developed in vitro biophysical-stimulation platform using these nanoactuators showed predictable operational characteristics. Also, a few-micrometer sinusoidal signal was generated successfully without any distortion. Three-dimensional scaffolds fitting the critical-size rat calvarial defect model were fabricated using poly(caprolactone), poly(lactic-co-glycolic acid), and tricalcium phosphate. Runt-related transcription factor 2 expression was increased upon stimulation of human adipose-derived stem cells (ASCs) on these scaffolds were stimulated in the in vitro biophysical-stimulation platform. Additionally, the use of this platform resulted in up-regulation of alkaline phosphate, osteopontin, and osterix expression compared to the non-stimulated group. These preliminary in vitro results suggest that the biophysical environment provided by the in vitro biophysical-stimulation platform influences the osteogenic differentiation of ASCs.

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Section: Discussionmentioning

confidence: 99%

Flexure-Based Device for Cyclic Strain-Mediated Osteogenic Differentiation

Kang

Jeong

Hong

et al. 2013

Journal of Biomechanical Engineering

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“…This value is more than order of magnitude smaller than the observed MR. 25 A more detailed model of the domain wall MR, in double exchange ferromagnets, predicts a 1%-2% effect which is consistent with our measured MR. 26 Finally, it is also interesting to note that a macroscopic mechanism based on the Hall effect ͑which produces current deflection near DWs͒ could also potentially lead to ⌬ tp values of the order of those measured. …”

Section: Figmentioning

confidence: 93%

Magnetotransport and magnetic domain structure in compressively strained colossal magnetoresistance films

Suzuki

Rüdiger

et al. 1999

Applied Physics Letters

129

113

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We have studied the magnetoresistance ͑MR͒ of compressively strained La 0.7 Sr 0.3 MnO 3 ͑LSMO͒ films in various magnetic states in order to understand the role of magnetic domain structure on magnetotransport. In thin films of LSMO on ͑100͒ LaAlO 3 , the perpendicular magnetic anisotropy results in perpendicularly magnetized domains with fine scale ϳ200 nm domain subdivision, which we image directly at room temperature using magnetic force microscopy. The main MR effects can be understood in terms of bulk colossal MR and anisotropic MR. We also find evidence for a small domain wall contribution to the MR, which is an order of magnitude larger than expected from a double exchange model.The doped perovskite manganites have received an enormous amount of attention recently because they exhibit colossal magnetoresistance ͑CMR͒ and may be half metallic, with complete spin polarization at the Fermi level. For these reasons, they may find important uses in magnetoresistive devices, such as magnetic random access memory and sensors. As has been found in magnetoresistive devices based on transition metal ferromagnets, controlling the electronic transport and magnetic properties of these materials in thin film form will be essential to applications. Experimentally, the magnetic and transport properties of colossal magnetoresistance materials have been shown to be highly sensitive to microstructure as well as lattice distortions both in thin film and bulk form. Many groups have shown that properties such as Curie temperature, resistivity and magnetoresistance effect are extremely sensitive to chemical and hydrostatic pressure as well as lattice mismatch with an underlying substrate.1-11 Studies of bulk polycrystalline pellets, thin films of varying polycrystallinity and isolated grain boundaries have shown that the magnetoresistance is profoundly affected by transport across grain boundaries. 2,12,13 Magnetic domain structure may also to lead to distinctive magnetotransport effects in thin films. Mathur et al. report that the measured resistivity of a magnetic domain wall is four orders of magnitude larger than that predicted by a simple double exchange picture.14 Wang et al. have also suggested that large low field magnetoresistance ͑MR͒, in ultrathin compressively strained doped manganite thin films, may be due to domain wall scattering.9 In order to address these questions in LSMO, we have prepared in-plane compressively strained films of LSMO on ͑001͒ LAO (aϭbϭc ϭ3.79 Å) substrates using pulsed laser deposition.9 These films naturally split into stripe domains with length scales set by the strain and film thickness. This enables us to study the effect of magnetic microstructure on MR in a systematic manner. In this letter, we have investigated the magnetics and magnetotransport of epitaxial La 0.7 Sr 0.3 MnO 3 ͑LSMO͒ films. The main MR effects can be explained by CMR and anisotropic MR. We also find evidence for a small domain wall ͑DW͒ contribution to the MR, which is an order of magnitude larger than expected based ...

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“…This is a characteristic chemical shift for a CF 2 group adjacent to a terminal CF 3 in a perfluorinated chain. 25 The COSY connection from 126.2 to 122.2 thus identifies the fluorines on C-5. Then the peak at 122.2 has a second correlation, to 123.4, which provides the assignment for the Fs on C-3.…”

Section: Cosy Of Pfoa (1)mentioning

confidence: 99%

Concerning the origin of ¹⁹F¹⁹F NMR COSY and NOESY connections in the spectra of perfluorooctanoic acid, R_F‐palmitic acid‐F₁₃ and diethyl perfluorosuberate

Buchanan

Munteanu

Dawson

et al. 2005

Magnetic Reson in Chemistry

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A combination of 19F nuclear Overhauser effects (NOE) and molecular mechanics calculations are presented for delineating the spatial origin of the well-known four-bond 19F-19F COSY connections which are generally observed in the 19F NMR spectra of compounds containing perfluorinated chains. Perfluorooctanoic acid (PFOA), R(F)-palmitic acid-F13 and diethyl perfluorosuberate were used as test cases. Spin-lattice relaxation times (T1) are included and NOESY correlations through three and four bonds occur.

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Fluorine-19 NMR

Cited by 16 publications

References 103 publications

Flexure-Based Device for Cyclic Strain-Mediated Osteogenic Differentiation

Flexure-Based Device for Cyclic Strain-Mediated Osteogenic Differentiation

Magnetotransport and magnetic domain structure in compressively strained colossal magnetoresistance films

Concerning the origin of ¹⁹F¹⁹F NMR COSY and NOESY connections in the spectra of perfluorooctanoic acid, R_F‐palmitic acid‐F₁₃ and diethyl perfluorosuberate

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Fluorine-19 NMR

Cited by 16 publications

References 103 publications

Flexure-Based Device for Cyclic Strain-Mediated Osteogenic Differentiation

Flexure-Based Device for Cyclic Strain-Mediated Osteogenic Differentiation

Magnetotransport and magnetic domain structure in compressively strained colossal magnetoresistance films

Concerning the origin of 19F19F NMR COSY and NOESY connections in the spectra of perfluorooctanoic acid, RF‐palmitic acid‐F13 and diethyl perfluorosuberate

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Concerning the origin of ¹⁹F¹⁹F NMR COSY and NOESY connections in the spectra of perfluorooctanoic acid, R_F‐palmitic acid‐F₁₃ and diethyl perfluorosuberate