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Related Concept Videos

Passive Filters01:27

Passive Filters

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Passive filters are utilized to shape the frequency spectrum of signals across a diverse array of applications. These filters, using only passive elements like resistors (R), inductors (L), and capacitors (C), are capable of selectively allowing or blocking certain frequency ranges without the need for external power sources.
Low-Pass Filters
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Electrostatic Boundary Conditions01:16

Electrostatic Boundary Conditions

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Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
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Active Filters01:25

Active Filters

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Active filters are electronic circuits that use operational amplifiers (op-amps), resistors, and capacitors to filter out unwanted frequency components from a signal. A first-order low-pass active filter is designed to pass signals with a frequency lower than a certain cutoff frequency and attenuate frequencies higher than that cutoff frequency. The transfer function for a first-order low-pass active filter is:
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Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

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When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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Classifying Matter by Composition03:35

Classifying Matter by Composition

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Matter: Pure Substances and Mixtures
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Protein Complex Assembly02:41

Protein Complex Assembly

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Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
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PMMA-ITO Composite Formation via Electrostatic Assembly Method for Infra-Red Filtering.

Wai Kian Tan1, Atsushi Yokoi2, Go Kawamura3

  • 1Institute of Liberal Arts and Science, Toyohashi University of Technology, 441-8580 Toyohashi, Japan. tan@las.tut.ac.jp.

Nanomaterials (Basel, Switzerland)
|June 19, 2019
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Summary

A new electrostatic assembly method creates a homogeneous poly(methylmethacrylate) (PMMA)-indium tin oxide (ITO) composite. This material offers high visible light transparency and controllable infra-red (IR) shielding, ideal for advanced applications.

Keywords:
compositeelectrostatic adsorptionelectrostatic assemblyinfra-red filtering

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Achieving homogenous composite materials is challenging due to particle agglomeration in conventional mixing.
  • Advanced applications require functional composites with tailored properties, such as optical transparency and specific shielding effects.

Purpose of the Study:

  • To develop a facile method for creating a homogeneous poly(methylmethacrylate) (PMMA)-indium tin oxide (ITO) composite.
  • To achieve high visible light transparency and effective infra-red (IR) shielding in the composite material.
  • To demonstrate the tunability of IR shielding properties by varying the concentration of ITO nanoparticles.

Main Methods:

  • Utilized an electrostatic assembly technique for composite formation.
  • Incorporated indium tin oxide (ITO) nanoparticles into a poly(methylmethacrylate) (PMMA) matrix.
  • Characterized the optical properties, including visible light transparency and IR shielding capabilities.

Main Results:

  • Successfully formed a homogeneous PMMA-ITO composite material.
  • Achieved high visible light transparency, up to 90%.
  • Demonstrated excellent infra-red (IR) shielding properties, controllable by ITO nanoparticle content.

Conclusions:

  • Electrostatic assembly is an effective method for creating homogeneous PMMA-ITO composites.
  • The developed composite exhibits promising properties for applications requiring transparency and IR shielding, such as automotive windscreens and heat preservation technologies.
  • The ability to control IR shielding by adjusting ITO content offers a platform for designing advanced IR optical polymeric materials.