Skip to main content

Graphene Speaker

Since the discovery of Graphene many potential applications arises from this amazing material due to its superior physical and chemical properties. Electrical and electronical applications are one of the fields that graphene finds many application to fit in due to its high conductivity and flexibility properties. Recently, researchers at Korea Advanced Institute of Science and Technology (KAIST) had successfully developed thermoacoustic speakers that is made out of graphene. The speaker is thin, flexible and non-vibrating which can be integrated in many devices and applications.
The working principle of the speaker is related to thermoacoustics which is the production of sound by rapidly heating and cooling a material rather than through vibrations. This principle is known for more than a century but with only graphene extraordinary conductive properties this principle could be applied. In the manufacture of the speaker, graphene aerogel is prepared by two-step (freeze-drying and reduction/doping) method. The developers say this method could open the door for mass production of the speaker and the use in mobile devices and other applications which require no vibrating units.
More information can be found in: Choong Sun Kim et al. Application of N-Doped Three-Dimensional Reduced Graphene Oxide Aerogel to Thin Film Loudspeaker, ACS Applied Materials & Interfaces (2016). DOI: 10.1021/acsami.6b03618 
Posted by 
Labels:

Comments

Post a Comment

Popular posts from this blog

Multi Walled Carbon Nanotube Dispersions

Carbon nanotubes (CNTs)  have attracted enormous attention in recent years due to its unique physical, electronic, optical and potential applications in materials science and nanotechnology. The van der Waals interaction between tubes, however, makes CNTs aggregate in most organic solvents and aqueous solutions, which is the major limitation of their practical applications.Various approaches have been studied to alter the CNT surface to promote the dispersion of individual nanotubes and prevent their reaggregation. On the basis of this widely accepted viewpoint, numerous techniques such as covalent bonding, surfactant coating and polymer wrapping have been developed for surface modification or sidewall functionalization.These methods, however, are complicated, time-consuming and cause permanent damage to the CNT structure and properties of the surface, which produces residues of the dispersion agent for the final product. Figure: Single Walled Carbon Nanotube (SWCNT) It has re
Post a Comment
Read more

Carbon Nanotube Threads

Since its discovery, carbon nanotube (CNT) has attracted many interests in different technology fields due to its extraordinary properties. Properties such as, high strength, great electrical and thermal conductivity, light weight and flexibility made CNT one of the best materials for wide range of applications. However, from its name it can be understood that CNT is a nanoscale material which is very small to be applied for the production of daily products. Researchers all around the world are working on finding methods and techniques which could produce new materials with the extraordinary properties of CNT. Image retrieved from:  https://worldindustrialreporter.com/strong-light-flexible-carbon-nanotubes-threads-with-ultrahigh-conductivity/ One of these research is focusing on the production of high strength threads that can be used in the manufacturing of fabrics, cables and ropes. An international group of scientists were able to produce a flexible conductive thread that i
Post a Comment
Read more

Magnesium Oxide Nanoparticles/Nanopowder and Applications

General Information about Magnesium Oxide Magnesium oxide which has the chemical formula of MgO, is a white hygroscopic solid mineral that occurs naturally as periclase and is a source of Magnesium. It is a white powder at room temperature. Magnesium Oxide has very high melting point (2825  o C) and boiling point (3600  o C).                                                                                                                                                                                Magnesium Oxide Nanoparticles/Nanopowder and Usage Areas                                        Magnesium Oxide nanoparticles/nanopowder  can be used in many different areas. For example Magnesium Oxide nanoparticles/nanopowder are used as a fire retardant for chemical fiber and plastics trades. For making crucible, smelter, insulated conduit, electrode bar, and electrode sheet  Magnesium Oxide Nanoparticles/Nanopowder  can be used as electric insulating material. Magnesium Oxide nan
Post a Comment
Read more