Three‐dimensional thermophotonic image optimization modalities of truncated correlation photothermal coherence tomography

Welch, Robert L.; Sivagurunathan, Koneswaran; Tavakolian, Pantea; Mandelis, Andreas

doi:10.1002/jbio.202200018

Cited by 5 publications

(3 citation statements)

References 8 publications

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“…The eTC-PCT software then generates the time/equivalent depth profile of photothermal properties from its primary output channels, which are the amplitude and phase. The detailed explanation of the eTC-PCT signal processing technique can be found elsewhere. , Here, eTC-PCT images are used to compare the differences in the morphology of solvent and melt mixing samples (Figure ).…”

Section: Resultsmentioning

confidence: 99%

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Boron Nitride Nanotubes in Polycarbonate for Thermal Management Applications

Zandieh,

Shokouhi,

Hamidinejad

et al. 2024

ACS Appl. Nano Mater.

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Boron nitride nanotubes (BNNTs) are among the most effective additives for producing polymeric nanocomposites that exhibit high thermal conductivity but remain electrically nonconductive. However, the main challenge in the fabrication of such composites comes from the low dispersibility of BNNTs in polymeric matrices. This research aims to establish guidelines for controlling the morphology of nanocomposite, thereby adjusting their thermal conductivity and heat dissipation rate for optimized heat management applications. Two mixing methods, solvent and melt mixings, have been employed to incorporate noncovalently functionalized BNNTs (poly(3-hexyl-thiophene) (P3HT)-BNNTs) into a polycarbonate matrix, and the effects of processing conditions on the morphology of the nanocomposites have been decoupled and analyzed systematically. Smaller microscale agglomerations of BNNTs with better dispersion were observed with the melt mixing method, whereas the solvent mixing method maintained a higher aspect ratio of BNNTs. Although improved thermal conduction was evident, thermal conductivity in either mixing method did not change significantly up to 5 wt % BNNT; however, the heat dissipation rate of the melt-mixed samples was around twice higher. This indicates that the heat dissipation rate is sensitive to the morphology and length of the nanotubes in the samples. UV−vis-NIR spectroscopy and enhanced truncated-correlation photothermal coherence tomography (eTC-PCT) studies revealed that the higher heat dissipation rate of the melt-mixed samples is attributable to better dispersion and distribution of BNNTs that were enhanced by their smaller agglomeration sizes and aspect ratios.

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Section: Resultsmentioning

confidence: 99%

“…The detailed explanation of the eTC-PCT signal processing technique can be found elsewhere. 48,49 Here, eTC-PCT images are used to compare the differences in the morphology of solvent and melt mixing samples (Figure 5).…”

Section: Thermal Conductivity and Heat Dissipationmentioning

confidence: 99%

Boron Nitride Nanotubes in Polycarbonate for Thermal Management Applications

Zandieh,

Shokouhi,

Hamidinejad

et al. 2024

ACS Appl. Nano Mater.

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“…The recent development of thermophotonic modalities such as truncated correlation photothermal coherence tomography (TC-PCT) (5) and its enhanced version (eTC-PCT) (6) has the ability to produce depth-resolved tomographic images and three-dimensional (3D) mapping of biological hard and soft tissues. In dental imaging applications, eTC-PCT has shown 3D visualization and the subsurface extent of a variety of dental defects validated by micro-computed tomography (μCT), a nondestructive laboratory gold standard method for the measurement of dental flaws and demineralization caries (7)(8)(9)(10). These proof-of-concept studies demonstrated that eTC-PCT has the potential to provide dental practitioners not only with tools for detecting caries but also for detecting cracks before a large portion of a tooth fractures off, in their future clinical applications.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional thermophotonic super-resolution imaging by spatiotemporal diffusion reversal method

Thapa,

Tavakolian,

Zhou

et al. 2023

Sci. Adv.

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Spatial super-resolution in thermophotonic imaging was achieved using a combination of spatial second-derivative forming, spatial gradient adaptive filtering, and Richardson-Lucy deconvolution in conjunction with the construction of an experimental point spread function. When implemented through enhanced truncation-correlation photothermal coherence tomography (eTC-PCT), it was possible to restore blurred infrared thermophotonic images to their prediffusion optical resolution state. This modality was tested in various biological applications and proved to be capable of imaging fine axial cracks in human teeth, well-patterned anatomical subsurface structures of a mouse brain, and neovascularization in a mouse thigh due to the rapid proliferation of cancer cells. This modality was found to be immune to optical scattering and could reveal the true spatial extent of biological features at subsurface depths that conventional thermal imaging cannot reach because of limitations imposed by the physics of spreading diffusion.

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Highly Anisotropic Thermally Conductive Dielectric Polymer/Boron Nitride Nanotube Composites for Directional Heat Dissipation

Zandieh,

Buahom,

Baradaran Shokouhi

et al. 2024

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An ideal dielectric material for microelectronic devices requires a combination of high anisotropic thermal conductivity and low dielectric constant (ɛ′) and loss (tan δ). Polymer composites of boron nitride nanotubes (BNNTs), which offer excellent thermal and dielectric properties, show promise for developing these dielectric polymer composites. Herein, a simple method for fabricating polymer/BNNT composites with high directional thermal conductivity and excellent dielectric properties is presented. The nanocomposites with directionally aligned BNNTs are fabricated through melt‐compounding and in situ fibrillation, followed by sintering the fibrous nanocomposites. The fabricated nanocomposites show a significant enhancement in thermal properties, with an in‐plane thermal conductivity (K‖) of 1.8 Wm−1K−1—a 450% increase—yielding a high anisotropy ratio (K‖/K⊥) of 36, a 1700% improvement over isotropic samples containing only 7.2 vol% BNNT. These samples exhibit a 120% faster in‐plane heat dissipation compared to the through‐plane within 2 s. Additionally, they display low ɛ′ of ≈3.2 and extremely low tan δ of ≈0.014 at 1 kHz. These results indicate that this method provides a new avenue for designing and creating polymer composites with enhanced directional heat dissipation properties along with high K‖, suitable for thermal management applications in electronic packaging, thermal interface materials, and passive cooling systems.

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Three‐dimensional thermophotonic image optimization modalities of truncated correlation photothermal coherence tomography

Abstract: Truncated correlation photothermal coherence tomography (TC-PCT) is a pulse-compression, matched-filter-

Cited by 5 publications

References 8 publications

Boron Nitride Nanotubes in Polycarbonate for Thermal Management Applications

Boron Nitride Nanotubes in Polycarbonate for Thermal Management Applications

Three-dimensional thermophotonic super-resolution imaging by spatiotemporal diffusion reversal method

Highly Anisotropic Thermally Conductive Dielectric Polymer/Boron Nitride Nanotube Composites for Directional Heat Dissipation

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