Measurement of tilt-bias angle: performance evaluation of the crystal rotation method

1997 ◽  
Vol 5 (3) ◽  
pp. 283
Author(s):  
M. E. Becker
Keyword(s):  
Performance Evaluation ◽  
Crystal Rotation ◽  
Rotation Method

High Pretilt Angle Measurement by Extended Crystal Rotation Method

2004 ◽  
Vol 412 (1) ◽  
pp. 331-337 ◽  
Author(s):  
Jin Gwag ◽  
Seo Lee ◽  
Kyoung Ho-Park ◽  
Won Park ◽  
Kwan-Young Han ◽  
...  
Keyword(s):  
Angle Measurement ◽  
Crystal Rotation ◽  
Rotation Method ◽  
Pretilt Angle

Improvement of the crystal rotation method to measure the flexoelectric difference (e1–e3) in achiral materials using AC electric fields

2016 ◽  
Vol 43 (10) ◽  
pp. 1462-1471 ◽  
Author(s):  
J. Etxebarria ◽  
S. Rodríguez-Conde ◽  
J. Ortega ◽  
G. Sanz-Enguita ◽  
C. L. Folcia
Keyword(s):  
Electric Fields ◽  
Ac Electric Fields ◽  
Crystal Rotation ◽  
Rotation Method

Single Crystal Solid-State NMR of Magnetically Oriented Powder

2014 ◽  
Vol 70 (a1) ◽  
pp. C1086-C1086
Author(s):  
Ryosuke Kusumi ◽  
Fumiko Kimura ◽  
Tsunehisa Kimura
Keyword(s):  
Magnetic Field ◽  
Solid State ◽  
Chemical Shift ◽  
Single Crystal ◽  
Solid State Nmr ◽  
Chemical Shift Tensor ◽  
Magic Angle ◽  
Full Information ◽  
Crystal Rotation ◽  
Rotation Method

Solid-state NMR spectroscopy is one of the most widely used methods for investigating crystal structures, along with the X-ray and neutron diffraction methods. Solid-state NMR can provide structural information including isotropic chemical shift, dipolar and quadrupolar couplings, spin diffusion, and chemical shift tensor. Among these, the chemical shift tensor is of particular significance because the electronic environment around a nucleus is directly reflected on the chemical shift tensor. However, full information of the chemical shift tensor, including principal values and axes, is difficult to obtain experimentally because a large single crystal is required for the measurement. On the other hand, we have proposed the use of a magnetically oriented microcrystal array (MOMA) as an alternative to a single crystal.[1,2] A MOMA is a composite in which microcrystals are aligned three-dimensionally, prepared by using a time-dependent magnetic field. We recently demonstrated that the13C chemical shift tensors of L-alanine crystal can be completely determined by application of the standard procedure in the single-crystal rotation method to a MOMA of L-alanine microcrystals,[3] as shown in Figure 1. The L-alanine MOMA produces sharp resonance peaks without resolution enhancement by magic angle spinning (MAS). In addition, we observed that the positions of the13C resonance peaks vary systematically as a function of the angle ψ that is the sample-rotation angle about the axis inclined by the magic angle with respect to the NMR magnetic field. From the ψ-dependence of the chemical shifts,13C chemical shift tensor was completely determined. We confirmed that the combination of MOMA with the single-crystal rotation method can be applied to other nuclei such as31P and15N. These results clearly show that the MOMA method is a powerful tool for obtaining full information of the chemical shift tensor from a microcrystalline powder without MAS.

Modified Crystal Rotation Method for Measuring High Pretilt Angle in Liquid Crystal Cells

1995 ◽  
Vol 34 (Part 1, No. 9A) ◽  
pp. 4905-4906 ◽  
Author(s):  
Koichiro Shirota ◽  
Michio Yaginuma ◽  
Ken Ishikawa ◽  
Hideo Takezoe ◽  
Atsuo Fukuda
Keyword(s):  
Liquid Crystal ◽  
Crystal Rotation ◽  
Rotation Method ◽  
Crystal Cells ◽  
Pretilt Angle

Fine Particle Mass Monitoring with Low-Cost Sensors: Corrections and Long-Term Performance Evaluation

2019 ◽  
Author(s):  
Carl Malings ◽  
Rebecca Tanzer ◽  
Aliaksei Hauryliuk ◽  
Provat K. Saha ◽  
Allen L. Robinson ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Fine Particle ◽  
Low Cost ◽  
Particle Mass ◽  
Long Term Performance ◽  
Term Performance
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