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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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IR Frequency Region: Alkene and Carbonyl Stretching01:29

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Double bonds in alkenes and carbonyl compounds exhibit stretching frequencies in the diagnostic region of the IR spectrum. In addition, alkenes exhibit vinylic C–H stretching and C–H out-of-plane bending absorptions that are useful for identifying substitution patterns.
Stretching frequencies are affected by several factors, such as resonance, inductive effects, ring strain, dipole moment, and hydrogen bonding. Consequently, the stretching frequency of the carbonyl double bond...
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IR Frequency Region: Alkyne and Nitrile Stretching01:22

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Both alkyne (C≡C) and nitrile (C≡N) functional groups contain triple bonds and show stretching absorptions around the wavenumber range of 2100 to 2300 cm−1 in the diagnostic region of the IR spectra.
Comparing the stretching vibrational frequency of  C≡C triple bonds with that of double and single bonds, it is evident that C≡C triple bonds exhibit a higher stretching frequency than C=C double and C–C single bonds. Similarly, the C≡N triple bond...
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Strain quantifies the deformation of a material under force, typically measured as normal strain, which represents the change in length when compared with the original length. Electrical strain gauges are used for enhanced accuracy. These devices consist of a conductive wire mounted on a paper backing that adheres to the material's surface. These gauges operate on the piezoresistive effect, where the wire's electrical resistance changes in response to mechanical deformation. The strain...
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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
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Productos electrónicos de radiofrecuencia extensibles y resistentes a la tensión

Sun Hong Kim1, Abdul Basir1, Raudel Avila2

  • 1Department of Electronic Engineering, Hanyang University, Seoul, Republic of Korea.

Nature
|May 22, 2024
PubMed
Resumen
Este resumen es generado por máquina.

La nueva electrónica de radiofrecuencia estirable (RF) mantiene un rendimiento constante bajo tensión. Esta innovación utiliza un nuevo sustrato dieléctroelástico, superando la degradación de la señal en los dispositivos portátiles.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Ingeniería eléctrica
  • Ingeniería biomédica

Sus antecedentes:

  • La electrónica estirable para aplicaciones de interfaz con la piel se basa en módulos de radiofrecuencia (RF) para telecomunicaciones y recolección de energía.
  • Los componentes de RF estirables existentes sufren cambios significativos en las propiedades eléctricas, como cambios de frecuencia de resonancia, bajo tensión elástica.
  • Estos cambios degradan la fuerza de la señal inalámbrica y la eficiencia de la transferencia de energía, especialmente en superficies dinámicas como la piel.

Objetivo del estudio:

  • Desarrollar electrónica de RF extensible invariante que mantenga las propiedades originales de RF bajo diferentes tensiones elásticas.
  • Introducir y caracterizar un nuevo material "dielectroelástico" como sustrato para esta electrónica de RF.
  • Demostrar la eficacia de esta electrónica invariante de tensión en los monitores de salud inalámbricos conectados a la piel.

Principales métodos:

  • Utilizó un nuevo material dieléctroelástico como sustrato para la electrónica de RF extensible.
  • Investigó las propiedades dieléctricas sintonizables del material para evitar cambios de frecuencia en los componentes de RF.
  • Empleó estudios experimentales y computacionales para comprender los materiales, la fabricación y las estrategias de diseño para el comportamiento invariante de tensión.

Principales resultados:

  • Se ha logrado una electrónica de RF elástica invariante que mantiene las propiedades de RF originales bajo varias deformaciones elásticas.
  • Se ha demostrado que el sustrato dieléctroelástico evita efectivamente los desplazamientos de frecuencia comunes en los materiales estirables convencionales.
  • Se han desarrollado monitores de salud inalámbricos funcionales con interfaz en la piel con una distancia de funcionamiento inalámbrico de hasta 30 metros bajo tensión.

Conclusiones:

  • El material dieléctroelástico desarrollado ofrece propiedades eléctricas, mecánicas y térmicas superiores para la electrónica de RF extensible de alto rendimiento.
  • La electrónica de RF invariante en tensión es factible y crucial para una comunicación inalámbrica confiable en aplicaciones dinámicas con interfaz en la piel.
  • Esta tecnología permite un monitoreo inalámbrico robusto y de largo alcance para aplicaciones avanzadas de atención médica.