Rapid visualization of macromolecular orientation by discrete frequency mid-infrared spectroscopic imaging

Tomasz P. Wrobel, Prabuddha Mukherjee, Rohit Bhargava

Research output: Contribution to journalArticle

Abstract

Infrared (IR) spectroscopic imaging has been used to measure the composition and orientation of polymeric systems for decades. IR microscopy can provide detailed views of microscopic regions, allowing the observation of both morphology and molecular properties of a sample, but involves a trade-off between the spatial extent and details of molecular content. Here we describe an approximately two orders of magnitude faster approach to measure the spherulitic structure and molecular orientation in large semi-crystalline polymer samples compared to extant Fourier transform infrared (FT-IR) spectroscopic imaging. This discrete frequency approach utilizes individual narrowband emission lines of a quantum cascade laser (QCL) source to spectrally image large areas rapidly. The inherent polarization of the laser beam is employed to measure orientation, enabling calculation of Hermans in-plane orientation function along with molecular chain angles distribution.

Original languageEnglish (US)
Pages (from-to)75-79
Number of pages5
JournalAnalyst
Volume142
Issue number1
DOIs
StatePublished - Jan 7 2017

Fingerprint

Semiconductor Lasers
Fourier Analysis
Molecular Structure
visualization
Microscopy
Polymers
Lasers
Visualization
Observation
Infrared radiation
Imaging techniques
Quantum cascade lasers
Molecular orientation
laser
Laser beams
Fourier transforms
Microscopic examination
Polarization
trade-off
Fourier transform

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry

Cite this

Rapid visualization of macromolecular orientation by discrete frequency mid-infrared spectroscopic imaging. / Wrobel, Tomasz P.; Mukherjee, Prabuddha; Bhargava, Rohit.

In: Analyst, Vol. 142, No. 1, 07.01.2017, p. 75-79.

Research output: Contribution to journalArticle

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