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Thermal Sigmatropic Reactions: Overview01:16

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Sigmatropic rearrangements are a class of pericyclic reactions in which a σ bond migrates from one part of a π system to another. These are intramolecular rearrangements where the total number of σ and π bonds remain unchanged.
Sigmatropic shifts are classified based on an order term [i, j ], where i and j indicate the number of atoms across which each end of the σ bond migrates. Below are examples of a [3,3] sigmatropic shift in 1,5-hexadiene, referred...
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Carbon Nanomaterial-Based Nanofluids for Direct Thermal Solar Absorption.

Nguyen Trong Tam1,2,3, Nguyen Viet Phuong2, Phan Hong Khoi4

  • 1Institute of Materials Sciences, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet Street, Cau Giay District, Hanoi 100000, Vietnam.

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Carbon nanomaterial-based nanofluids show great potential for improving direct solar thermal absorption collectors. This review covers their preparation, application, and future research directions for enhanced solar energy capture.

Keywords:
carbon nanomaterialsdirect thermal solar absorptionnanofluidsthermal conductivityviscosity

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Area of Science:

  • Materials Science
  • Renewable Energy Engineering
  • Nanotechnology

Background:

  • Direct solar thermal absorption collectors rely on efficient working fluids.
  • Various heat transfer fluids are under investigation.
  • Carbon nanomaterials offer superior heat absorption and transfer properties.

Purpose of the Study:

  • To provide an overview of carbon nanomaterial-based nanofluids for direct solar thermal absorption.
  • To summarize current achievements in their preparation and application.
  • To discuss challenges and future research recommendations.

Main Methods:

  • Literature review of carbon nanomaterial-based nanofluids.
  • Analysis of preparation techniques for these nanofluids.
  • Evaluation of their performance in direct solar thermal absorption.

Main Results:

  • Carbon nanomaterial-based nanofluids demonstrate significant potential for enhancing solar thermal collectors.
  • Key properties of carbon nanomaterials contribute to improved heat absorption and transfer.
  • Current research highlights advancements in nanofluid preparation and application.

Conclusions:

  • Carbon nanomaterial-based nanofluids are promising for direct solar thermal absorption.
  • Further research is needed to overcome existing challenges.
  • Future work should focus on optimizing preparation and exploring novel applications.