scholarly journals 1 H-19 F REDOR-filtered NMR spin diffusion measurements of domain size in heterogeneous polymers

2017 ◽  
Vol 55 (11) ◽  
pp. 1006-1014 ◽  
Author(s):  
Eric G. Sorte ◽  
Todd M. Alam
Keyword(s):  
Spin Diffusion ◽  
Domain Size ◽  
Heterogeneous Polymers

Domain Size Determination of Poly(phthalamide)/Poly(dimethylsiloxane) Block Copolymers by1H Solid-State Spin Diffusion NMR Spectroscopy

2008 ◽  
pp. 339-343
Author(s):  
Axel Kretschmer ◽  
Robert A. Drake ◽  
Simeon J. Bones ◽  
Michael Neidhoefer ◽  
Manfred Wilhelm ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Block Copolymers ◽  
Spin Diffusion ◽  
Domain Size ◽  
Size Determination ◽  
Diffusion Nmr ◽  
State Spin

Domain Size Determination of Poly(phthalamide)/Poly(dimethylsiloxane) Block Copolymers by1H Solid-State Spin Diffusion NMR Spectroscopy

2008 ◽  
pp. 339-343
Author(s):  
Axel Kretschmer ◽  
Robert A. Drake ◽  
Simeon J. Bones ◽  
Michael Neidhoefer ◽  
Manfred Wilhelm ◽  
...  
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Block Copolymers ◽  
Spin Diffusion ◽  
Domain Size ◽  
Size Determination ◽  
Diffusion Nmr ◽  
State Spin

Filler Distribution and Domain Size of Elastomer Compounds by Solid-State NMR and AFM

2007 ◽  
Vol 80 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Weiguo Hu ◽  
Maria D. Ellul ◽  
Andy H. Tsou ◽  
Sudhin Datta
Keyword(s):  
Solid State ◽  
Carbon Black ◽  
Solid State Nmr ◽  
Spin Diffusion ◽  
Filler Content ◽  
Domain Size ◽  
Magic Angle Spinning ◽  
Magic Angle ◽  
Rubber Blends ◽  
Filler Distribution

Abstract Solid-state NMR methods were used to characterize the filler distribution in rubber blends and domain size of thermoplastic vulcanizates (TPV). Correlation between filler content and magic angle spinning (MAS) 13C and 1H NMR signal linewidth was established, and filler content in each component of the rubber blends was determined. In IIR/BR and BIMS/BR blends, carbon black enriches in BR phase. Comparison of the carbon black enrichment in both blends suggests that BIMS has a slightly stronger interaction with fillers than does IIR. Results obtained from AFM analysis were compared with NMR observations. Spin diffusion NMR was demonstrated to be useful for quantifying the amount of interfacial component in TPV. Its advantages — ease of quantification and high sensitivity for smaller domains — make it a complementary approach to microscopic techniques for elastomer morphology characterization.

Domain size of dynamic heterogeneities in antiplasticized polycarbonate by proton spin diffusion

1994 ◽  
Vol 32 (S1) ◽  
pp. S18-S22 ◽  
Author(s):  
Yu Liu ◽  
Paul T. Inglefield ◽  
Alan A. Jones ◽  
R. P. Kambour
Keyword(s):  
Spin Diffusion ◽  
Domain Size ◽  
Proton Spin

Investigation of Domain Size in Polymer Membranes Using Double-Quantum-Filtered Spin Diffusion Magic Angle Spinning NMR

2005 ◽  
Vol 38 (4) ◽  
pp. 1201-1206 ◽  
Author(s):  
B. R. Cherry ◽  
C. H. Fujimoto ◽  
C. J. Cornelius ◽  
T. M. Alam
Keyword(s):  
Spin Diffusion ◽  
Polymer Membranes ◽  
Domain Size ◽  
Magic Angle Spinning ◽  
Double Quantum ◽  
Magic Angle ◽  
Angle Spinning

Domain sizes in heterogeneous polymers by spin diffusion using single-quantum and double-quantum dipolar filters

2003 ◽  
Vol 24 (1) ◽  
pp. 39-67 ◽  
Author(s):  
A. Buda ◽  
D.E. Demco ◽  
M. Bertmer ◽  
B. Blümich ◽  
B. Reining ◽  
...  
Keyword(s):  
Spin Diffusion ◽  
Double Quantum ◽  
Single Quantum ◽  
Heterogeneous Polymers

Antiphase Boundaries in Ordered Ni3FE Crystals

1969 ◽  
Vol 27 ◽  
pp. 62-63
Author(s):  
Y. H. Liu
Keyword(s):  
Domain Size ◽  
Antiphase Domain ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hardening Mechanism ◽  
Superlattice Structure ◽  
Disordered Phase ◽  
Domain Boundaries ◽  
Atomic Scattering ◽  
The Difference

Ordered Ni3Fe crystals possess a LI2 type superlattice similar to the Cu3Au structure. The difference in slip behavior of the superlattice as compared with that of a disordered phase has been well established. Cottrell first postulated that the increase in resistance for slip in the superlattice structure is attributed to the presence of antiphase domain boundaries. Following Cottrell's domain hardening mechanism, numerous workers have proposed other refined models also involving the presence of domain boundaries. Using the anomalous X-ray diffraction technique, Davies and Stoloff have shown that the hardness of the Ni3Fe superlattice varies with the domain size. So far, no direct observation of antiphase domain boundaries in Ni3Fe has been reported. Because the atomic scattering factors of the elements in NijFe are so close, the superlattice reflections are not easily detected. Furthermore, the domain configurations in NioFe are thought to be independent of the crystallographic orientations.

Formation process of periodic non-conservative antiphase boundary structure in L-Pd5Ce

1990 ◽  
Vol 48 (4) ◽  
pp. 162-163
Author(s):  
Masaru Itakura ◽  
Noriyuki Kuwano ◽  
Kensuke Oki
Keyword(s):  
Formation Process ◽  
Domain Size ◽  
Antiphase Boundary ◽  
Boundary Structure ◽  
Temperature Phase ◽  
Arc Melting ◽  
Iced Water ◽  
Antiphase Domains ◽  
Low Temperature Phase ◽  
Degree Of Order

The low temperature phase of Pd5Ce (L-Pd5Ce) has a one-dimensional long period superstructure (1D-LPS) derived from Ll2. The periodic antiphase boundaries (APBs) are parallel to (110) planes and have a shift vector of 1/2[110]. Hereafter, the indices are referred to the basic lattices of Ll2 As insertion of the APB causes a change in composition, such an APB is called “non-conservative”. Then, a domain size M depends upon the Ce concentration in the alloy. It was found that M increases also with temperature. The temperature dependency of M is attributed to a change of the degree of order within the antiphase domains. In this work, morphology of the non-conservative APBs is observed to clarify the formation process of the 1D-LPS.The alloy of Pd-16.7 at%Ce was prepared by arc melting in argon atmosphere. Disc specimens made from the alloy ingot were first held at 985 K for 260 ks and quenched in iced water to obtain the state of M=∞ or Ll2, followed by annealing for various lengths of time. The annealing temperature was 873 K where the equilibrium value for M is about 3 in unit of (110) lattice spacing of Ll2. Observation was carried out using microscopes JEM-2000FX, JEM-4000EX (HVEM Lab., Kyushu Univ.) and JEM-2000EX (Dept. of Mater. Sci. Tech., Kyushu Univ.).

Domains and domain nucleation in magnetron-sputtered CoCr thin films

1993 ◽  
Vol 51 ◽  
pp. 1046-1047
Author(s):  
B. G. Demczyk
Keyword(s):  
Thin Films ◽  
Domain Structure ◽  
Magnetic Domain ◽  
Domain Size ◽  
Film Plane ◽  
Magnetic Domain Structure ◽  
Perpendicular Magnetization ◽  
Columnar Grains ◽  
Reversal Mechanism ◽  
Lorentz Transmission Electron Microscopy

CoCr thin films have been of interest for a number of years due to their strong perpendicular anisotropy, favoring magnetization normal to the film plane. The microstructure and magnetic properties of CoCr films prepared by both rf and magnetron sputtering have been examined in detail. By comparison, however, relatively few systematic studies of the magnetic domain structure and its relation to the observed film microstructure have been reported. In addition, questions still remain as to the operative magnetization reversal mechanism in different film thickness regimes. In this work, the magnetic domain structure in magnetron sputtered Co-22 at.%Cr thin films of known microstructure were examined by Lorentz transmission electron microscopy. Additionally, domain nucleation studies were undertaken via in-situ heating experiments.It was found that the 50 nm thick films, which are comprised of columnar grains, display a “dot” type domain configuration (Figure 1d), characteristic of a perpendicular magnetization. The domain size was found to be on the order of a few structural columns in diameter.

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