Results 81 to 90 of about 229,722 (351)

Breather-like pulses in a medium with the permanent dipole moment

, 2005
The solutions of the reduced Maxwell-Bloch equations for an anisotropic two-level medium, which describe the propagation of electromagnetic pulses having a duration from a few field oscillations, are studied.
Ustinov, N. V.
core   +1 more source

Microcellular Poly (Ethylene‐Co‐Vinyl Acetate)/Lignin Nanocomposites for Soft Ferroelectrets

Advanced Engineering Materials, EarlyView.
Lignin valorization for advanced porous polymer nanocomposites development and an upscaling route for continuous manufacturing of soft ferroelectrets for energy harvesting are studied. This work examines the role of lignin and carbon nanotubes (CNT) in modifying the mechanical, dielectric, and ferroelectret properties of poly (ethylene‐co‐vinyl acetate)
Yuchen Lian, Zihe Li, Chris Bowen, James Roscow, Alan M. Wemyss, Chaoying Wan   +5 more
wiley   +1 more source

Exploring Dipolar Dynamics and Ionic Transport in Metal‐Organic Frameworks: Experimental and Theoretical Insights

Advanced Functional Materials, EarlyView.
In this study, the interplay of dipolar dynamics and ionic charge transport in MOF compounds is investigated. Synthesizing the novel structure CFA‐25 with integrated freely rotating dipolar groups, local and macroscopic effects, including interactions with Cs cations are explored.
Ralph Freund, Arthur Schulz, Peter Lunkenheimer, Maryana Kraft, Thomas Bergler, Harald Oberhofer, Dirk Volkmer   +6 more
wiley   +1 more source

Structure and dielectric properties of polar fluids with extended dipoles: results from numerical simulations

, 2003
The strengths and short-comings of the point-dipole model for polar fluids of spherical molecules are illustrated by considering the physically more relevant case of extended dipoles formed by two opposite charges $\pm q$ separated by a distance $d ...
Frenkel D, Fröhlich H, Gray CG, Hansen J-P, Jackson JD, Lindahl E   +5 more
core   +1 more source

Ultrahigh Piezoelectricity in Truss‐Based Ferroelectric Ceramics Metamaterials

Advanced Functional Materials, Volume 35, Issue 12, March 18, 2025.
By leveraging the unique combination of polarization direction and loading state, ultrahigh piezoelectricity is achieved through careful tuning of the relative density and scaling ratio in truss‐based ferroelectric metamaterials. This approach enables the simultaneous realization of extremely high piezoelectric constants and ultralow dielectric ...
Jiahao Shi, Kang Ju, Haoyu Chen, Valérie Orsat, Agus P. Sasmito, Ali Ahmadi, Abdolhamid Akbarzadeh   +6 more
wiley   +1 more source

Uniaxial transition dipole moments in semiconductor quantum rings caused by broken rotational symmetry

Nature Communications, 2019
Annular semiconductor structures, or “quantum rings”, are of interest for quantum information and photonics applications. Here, the authors show that breaking rotational symmetry through elongation generates an in-plane optical transition dipole moment ...
Nicolai F. Hartmann, Matthew Otten, Igor Fedin, Dmitri Talapin, Moritz Cygorek, Pawel Hawrylak, Marek Korkusinski, Stephen Gray, Achim Hartschuh, Xuedan Ma   +9 more
doaj   +1 more source

Spin dynamics of a trapped spin-1 Bose Gas above the Bose-Einstein transition temperature

, 2008
We study collective spin oscillations in a spin-1 Bose gas above the Bose-Einstein transition temperature. Starting from the Heisenberg equation of motion, we derive a kinetic equation describing the dynamics of a thermal gas with the spin-1 degree of ...
A. Griffin, B.R. Lohnson, C.K. Law, D.M. Stamper-Kurn, D.S. Hall, G. Baym, H. Schmaljohann, H.J. Lewandowski, H.J. Miesner, J. Stenger, J.E. Williams, J.M. McGuirk, J.M. McGuirk, K.B. Davis, L. Pitaevskii, M. Erhard, M.H. Anderson, M.S. Chang, N.P. Bigelow, T. Nikuni, T. Nikuni, Tetsuro Nikuni, W. Zhang, Yuki Endo   +23 more
core   +1 more source

Highly Efficient 3D‐Printed PVDF‐Based Triboelectric Nanogenerators Featuring Polymorphic Perovskite Nanofillers

Advanced Functional Materials, EarlyView.
This study demonstrates the use of a low‐cost 3D printing technique to prepare a large‐area PVDF‐FAPbI3 composite dielectric film for flexible TENG application. The δ→α phase transformation of the FAPbI3 nanofillers has significantly improved the β‐phase content, morphology, and dielectric properties of the PVDF film.
Nurfatin Hafizah Zain Karimy, Hai Li, Hock Beng Lee, Devi Prashad Ojha, Manoj Mayaji Ovhal, Vasanthan Devaraj, Sooman Lim, Jae‐Wook Kang   +7 more
wiley   +1 more source

Quantum Size-Driven Spectral Variations in Pillar[n]arene Systems: A Density Functional Theory and Wave Function Assessment

Molecules
This study explores the quantum size effects on the optical properties of pillar[n]arene (n = 5, 6, 7, 8) utilizing density functional theory (DFT) and wave function analysis.
Cailian Yao, Tao Wang
doaj   +1 more source

Solution‐Processable and Ambient‐Stable Highly Conductive p‐Type Polymers Derived from Dihydropyrazine and Ethylenedioxythiophene

Advanced Functional Materials, EarlyView.
This work presents π–conjugated polymers based on dihydropyrazine (DHP) and ethylenedioxythiophene (EDOT), developed to produce highly conductive, flexible films for printed electronics. By optimizing the DHP and EDOT ratio, strong and compact π–π stacking is achieved, resulting in polymer films with conductivities up to 1700 S cm−1 under ambient ...
Sung Jae Jeon, Naixin Zhao, Yi Yuan, Yuning Li   +3 more
wiley   +1 more source