Open Access. Powered by Scholars. Published by Universities.®

Physics Commons

Open Access. Powered by Scholars. Published by Universities.®

Polarization

Discipline
Institution
Publication Year
Publication
Publication Type

Articles 121 - 122 of 122

Full-Text Articles in Physics

Twisting Transition In A Fiber Composed Of Chiral Smectic-C Liquid Crystal Polymer, R. A. Sones, Rolfe G. Petschek Apr 1996

Twisting Transition In A Fiber Composed Of Chiral Smectic-C Liquid Crystal Polymer, R. A. Sones, Rolfe G. Petschek

Faculty Scholarship

We consider a cylindrical fiber composed of main-chain liquid crystal polymer in the chiral smectic-C phase. Due to steric constraints on the liquid crystal polymer, the smectic layers orient perpendicular to the fiber axis, the liquid crystal director lies flat against the fiber wall, and a line disclination appears along the fiber axis. Using a Landau-de Gennes expression for the elastic free energy, we show that the fiber may undergo a transition from a cylinder to a helix. The transition is favored by large chirality, large fiber radius, and low surface tension, but is probably not experimentally accessible. However, a …


The Electret - An Effort To Find The Cause Of Its Permanent Polarization, Ernest F. Lundeen Jan 1932

The Electret - An Effort To Find The Cause Of Its Permanent Polarization, Ernest F. Lundeen

University of the Pacific Theses and Dissertations

Certain waxes when solidified in a strong electric field exhibit unusual electrical properties. Several days after formation there is a polarization in the direction of the field which seems to persist for an indefinite length of time. The surface that was in contact with the anode during formation first ass a negative charge and then obtains a positive charge, which under proper conditions is practically permanent. The surface that was in contact with the cathode first has a positive charge and then obtains a negative charge which is the permanent charge.