Bio‐Assembled Nanocomposites in Conch Shells Exhibit Giant Electret Hysteresis

  title={Bio‐Assembled Nanocomposites in Conch Shells Exhibit Giant Electret Hysteresis},
  author={Yingbang Yao and Qingxiao Wang and Hongtao Wang and Bei Zhang and Chao Zhao and Zhihong Wang and Zhengkui Xu and Ying Wu and Wei Huang and Pei-Yuan Qian and Xi Xiang Zhang},
  journal={Advanced Materials},
Giant electric polarization (2000-4000 μC cm(-2)) is observed in natural conch shells. The nanolaminas and biopolymer layers of their unique hierarchical microstructures exhibit ferroelectret behavior and account for the observed polarization. Such huge polarization leads to extremely high pyroelectric coefficients, 2-3 orders of magnitude larger than those of conventional ferroelectric materials. The possibility of tailoring the giant polarization for various applications is considered. 

Porous polymer composite membrane based nanogenerator: A realization of self-powered wireless green energy source for smart electronics applications

An efficient, flexible and unvaryingly porous polymer composite membrane based nanogenerator (PPCNG) without any electrical poling treatment has been realised as wireless green energy source to power

Natural Sugar-Assisted, Chemically Reinforced, Highly Durable Piezoorganic Nanogenerator with Superior Power Density for Self-Powered Wearable Electronics.

The crucial role of single-crystal sugar having a fascinating structure along with the synergistic enhancement of piezoelectricity during nanoconfinement of sugar-interfaced macromolecular PVDF chains is explored, and the PONG is proven to be a highly durable power-generating device validated by stability test over 10 weeks.

Chapter 7 -- Dielectric Properties of Bionanocomposites

Bionanocomposites represent an emerging group of nanostructured hybrid materials. Besides the structural and functional properties similar to conventional nanocomposites, the inherent properties, n

The preparation of γ-crystalline non-electrically poled photoluminescant ZnO–PVDF nanocomposite film for wearable nanogenerators

UV-visible absorption spectral analysis revealed the possibility of estimating a change in the optical band gap value, refractive index and optical activation energy in different concentrations of ZnO-NP incorporated PVDF nanocomposite films, and it possesses a useful methodology where ZnNPs can be used as an optical probe.

Multifunctional Supramolecular Organic Ferroelectrics

  • I. Urbanavičiūtė
  • Materials Science
    Linköping Studies in Science and Technology. Dissertations
  • 2019
Ferroelectric materials are known and valued for their multifunctionality arising from the possibility to perturb the remnant ferroelectric polarization by electric field, temperature and/or mechan

Electro-active properties of nanostructured films of cytosine and guanine nucleobases

The studies reveal electrical polarization switching effects which can be related to ferroelectricity in the films of guanine molecules and reveal dense nano-grained morphology.

Polarization-induced surface charges in hydroxyapatite ceramics

Calcium hydroxyapatite (HAp; Ca10(PO4)6(OH)2) is a well-known biomaterial that is the main inorganic component of bones and teeth. Control over the surface charge on HAp would be a key advance in the

Hydroxyapatite Thin Films with Giant Electrical Polarization

It is demonstrated that hydroxyapatite, a type of calcium phosphate commonly found in bone tissue, retains surprisingly large stored charge when synthesized electrochemically from aqueous solution.

Enhanced Dielectric Properties of Poly(dimethyl siloxane) Bimodal Network Percolative Composite with MXene.

The origin of dielectric properties optimization of composite is attributed to the boundary capacitor model, the accumulated charges at the interfaces between the conductive filler and insulating polymer matrix of composite and the distinct bimodal network structure.

Ferroelectric Polarization in Nanocrystalline Hydroxyapatite Thin Films on Silicon

It is demonstrated that nanocrystalline hydroxyapatite indeed exhibits ferroelectricity: a reversal of polarization under an electrical field, which will strengthen investigations on the role of electrical polarization in biomineralization and bone-density related diseases.



Self‐Assembly and Self‐Orientation of Truncated Octahedral Magnetite Nanocrystals

Monodispersed magnetite (Fe3O4) nanoparticles were synthesized. Transmission electron microscopy study shows that the nanoparticles are in the shape of Wagner-Seitz crystals. The magnetite

Nanoscale Structural and Mechanical Characterization of a Natural Nanocomposite Material: The Shell of Red Abalone

Nanoscale structural and mechanical characterization of the shell of a red abalone has been carried out. Cobble-like polygonal nanograins are basic building blocks that are used to construct

Giant Ferroelectric Polarization Beyond 150 µC/cm2 in BiFeO3 Thin Film

Ferroelectric BiFeO3 thin films have been deposited on Pt/TiO2/SiO2/Si substrate by pulsed-laser deposition. From the X-ray diffraction analysis, the BiFeO3 thin film consists of perovskite

Multiferroic and magnetoelectric materials

A ferroelectric crystal exhibits a stable and switchable electrical polarization that is manifested in the form of cooperative atomic displacements that arises through the quantum mechanical phenomenon of exchange.

Colloidal nanocrystal synthesis and the organic–inorganic interface

Colloidal nanocrystals are solution-grown, nanometre-sized, inorganic particles that are stabilized by a layer of surfactants attached to their surface, which makes these structures attractive and promising building blocks for advanced materials and devices.

Nanostructured artificial nacre

It is demonstrated that both structural features of nacre and bones can be reproduced by sequential deposition of polyelectrolytes and clays, and their nanoscale nature enables elucidation of molecular processes occurring under stress.

Microstorms in cellular polymers: a route to soft piezoelectric transducer materials with engineered macroscopic dipoles.

  • M. WegenerS. Bauer
  • Materials Science
    Chemphyschem : a European journal of chemical physics and physical chemistry
  • 2005
An overview is provided on the preparation of cellular polymers by physical foaming, on their charging by "microstorms", on their piezo- and pyroelectricity, and on analogies to ferroelectrics.

Super‐Hydrophobic Surfaces: From Natural to Artificial

Super‐hydrophobic surfaces, with a water contact angle (CA) greater than 150°, have attracted much interest for both fundamental research and practical applications. Recent studies on lotus and rice

Self-Assembled Plasmonic Nanoparticle Clusters

It is shown that self-assembled clusters of metal-dielectric spheres are the basis for nanophotonic structures, and plasmon modes exhibiting strong magnetic and Fano-like resonances emerge.

Less can be more. Holes in polymers lead to a new paradigm of piezoelectric materials for electret transducers

The review begins with a very brief history of electrets and of piezo and pyroelectricity in nonuniform space charge electrets. The development of cellular propylene as an electret-transducer