Photothermal Effect of Modulating Laser Irradiation on the Thermal Diffusivity of Al2O3 Nanofluids

Monir Noroozi, Bijan Mohammadi, Shahidan Radiman, Azmi Zakaria, Raba’ah Syahidah Azis

Research output: Contribution to journalArticle

Abstract

Modulated continuous wave (CW) lasers cause photothermal effect that leads to rapid optical absorption and generation of thermal waves around the irradiated nanostructures. In this work, we examined the effect of modulated CW laser irradiation on the particle fragmentation process to enhance the thermal diffusivity of nanofluids. A facile and cost-effective diode laser was applied to reduce the agglomerated size of Al2O3 nanoparticles in deionized water. The thermal wave generation, which was determined by the modulated frequency of the laser beam and the optical and thermal properties of the nanofluid, is also briefly discussed and summarized. The influence of laser irradiation time on nanoparticle sizes and their size distribution was determined by dynamic light scattering and transmission electron microscopy. The thermal diffusivity of the nanofluid was measured using the photopyroelectric method. The data obtained showed that the modulated laser irradiation caused the partial fragmentation of some agglomerated particles in the colloids, with an average diameter close to the original particle size, as indicated by a narrow distribution size. The reduction in the agglomerated size of the particles also resulted in an enhancement of the thermal diffusivity values, from 1.444 × 10−3 to 1.498 × 10−3 cm2/s in 0 to 30 min of irradiation time. This work brings new possibilities and insight into the fragmentation of agglomerated nanomaterials based on the photothermal study.

Original languageEnglish
Article number37
JournalNanoscale Research Letters
Volume14
DOIs
Publication statusPublished - 1 Jan 2019

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Thermal diffusivity
Laser beam effects
thermal diffusivity
Continuous wave lasers
fragmentation
irradiation
continuous wave lasers
Nanoparticles
lasers
Deionized water
Colloids
Dynamic light scattering
Light transmission
Nanostructured materials
nanoparticles
Light absorption
Particles (particulate matter)
Laser beams
Semiconductor lasers
light transmission

Keywords

  • Continuous wave laser
  • Fragmentation of nanoparticles
  • Photothermal effect
  • Thermal diffusivity of nanofluids

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Photothermal Effect of Modulating Laser Irradiation on the Thermal Diffusivity of Al2O3 Nanofluids. / Noroozi, Monir; Mohammadi, Bijan; Radiman, Shahidan; Zakaria, Azmi; Azis, Raba’ah Syahidah.

In: Nanoscale Research Letters, Vol. 14, 37, 01.01.2019.

Research output: Contribution to journalArticle

Noroozi, Monir ; Mohammadi, Bijan ; Radiman, Shahidan ; Zakaria, Azmi ; Azis, Raba’ah Syahidah. / Photothermal Effect of Modulating Laser Irradiation on the Thermal Diffusivity of Al2O3 Nanofluids. In: Nanoscale Research Letters. 2019 ; Vol. 14.
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