نتایج جستجو برای: electrostriction

تعداد نتایج: 212  

Journal: :The journal of physical chemistry. A 2007
F Ancilotto M Pi R Mayol M Barranco K K Lehmann

We have investigated, by means of density functional theory, the structure of a "scolium", that is, an electron circulating around a positively charged 4He nanodroplet, temporarily prevented from neutralization by the helium-electron repulsion. The positive ion core resides in the center of the nanodroplet where, as a consequence of electrostriction, a strong increase in the helium density with...

2011
M. A. Camacho-Lopez Jesus Carranza

Laser-induced deformation (bending) in azo dye-doped liquid-crystal elastomer thick films is demonstrated. We directly measure the laser-power-dependent deformation-strength (driving force). The deformation-relaxation time is also measured. We have observed that it recovers within 300 ms after the excitation laser pulse is gone, this gave a constant time of 75 ms. By estimating the optical elec...

Journal: :Photonics Research 2021

For an Er-doped fiber laser, for the first time, to best of our knowledge, we demonstrate both experimentally and theoretically a novel mechanism harmonic mode-locking based on electrostriction effect leading excitation torsional acoustic modes in transverse section laser. The exited modulate birefringence that results synchronization oscillations at linewidth narrowing with increased signal-to...

Journal: :Materials research letters 2021

Piezoelectricity in ferroelectrics arises from electrostriction biased by their spontaneous polarisation, which can be enhanced through a bias-induced polarisation. Doing so, the piezoelectric response tuned and significantly enhanced. In this study, ferroelectric polymer P(VDF-TrFE) was used to electro-mechanically excite silicon microcantilever. Using device, we demonstrate that polarisation ...

2012
G. Casar A. Eršte S. Glinšek X. Li X. Qian Q. M. Zhang V. Bobnar

Electrically-induced behaviuor was compared in the non-stretched and uniaxially stretched poly(vinylidene fluoride-trifluoroethylenechlorofluoroethylene) terpolymer a member of the relaxor polymer family that exhibits fast response speeds, a giant electrostriction, high electric energy density and a large electrocaloric effect. Although the temperature dependence of the low-field dielectric con...

2007
Ray H. Baughman

The various types of natural muscle are incredible material systems that enable the production of large deformations by repetitive molecular motions. Polymer artificial muscle technologies are being developed that produce similar strains and higher stresses using electrostatic forces, electrostriction, ion insertion, and molecular conformational changes. Materials used include elastomers, condu...

1997
Peter C. Michels Jonathan S. Dordick Douglas S. Clark

The transition state for subtilisin-catalyzed transesterification was probed by high-pressure kinetic studies in solvents spanning a wide range of dielectric constants. The electrostatic model of Kirkwood described the solvent effects and gave a lower limit of 31 ( 1.5 Debye for the dipole moment of the transition state. This value remained constant in a wide range of polar and apolar solvents,...

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