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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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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.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
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Raman Spectroscopy: Overview01:20

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The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

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Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

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A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
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Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

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Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
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Three-Dimensional Analysis of Strain01:29

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Three-dimensional strain analysis is crucial for understanding how materials deform under stress, particularly in elastic, homogeneous materials. This method employs principal stress axes to simplify complex stress states into more understandable forms. Subjected to stress, a small cubic element within a material either expands or contracts along these axes, transforming into a rectangular parallelepiped. This transformation effectively illustrates the material's deformation. The principal...
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Spectrum Analysis of Thermally Driven Curvature Inversion in Strained Graphene Ripples for Energy Conversion

James M Mangum1, Md R Kabir2, Tamzeed B Amin1

  • 1Department of Physics, University of Arkansas, Fayetteville, AR 72701, USA.

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Freestanding graphene

Keywords:
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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physics

Background:

  • Freestanding graphene exhibits excellent mechanical flexibility and electrical conductivity.
  • Its nanoscale instability makes it suitable for vibration energy harvesting.
  • Graphene can vibrate like a drum head when stretched or buckle into ripples when compressed.

Purpose of the Study:

  • To investigate the low-frequency vibrations of compressed freestanding graphene.
  • To quantify the energy barrier height in bistable graphene ripples.
  • To analyze the velocity distribution of vibrating graphene for energy harvesting.

Main Methods:

  • Ten graphene ripples were created with increasing compressive strain.
  • Each ripple was studied at five different temperatures.
  • The average time between curvature inversion events was analyzed.

Main Results:

  • Increasing compressive strain and temperature lowers vibration frequency.
  • The energy barrier height of graphene ripples was quantified.
  • Time-averaged velocity distribution shifted from Gaussian to Cauchy (Lorentzian).

Conclusions:

  • Low-frequency bistable vibrations in compressed graphene are promising for energy harvesting.
  • The observed Cauchy distribution is significant for optimizing energy harvesting applications.
  • Temperature and compressive strain influence graphene's vibrational behavior and energy barrier.