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ATP Energy Storage and Release

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ATP is a highly unstable molecule. Unless quickly used to perform work, ATP spontaneously dissociates into ADP and inorganic phosphate (Pi), and the free energy released during this process is lost as heat. The energy released by ATP hydrolysis is used to perform work inside the cell and depends on a strategy called energy coupling. Cells couple the exergonic reaction of ATP hydrolysis with endergonic reactions, allowing them to proceed.
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Sugar (a simple carbohydrate) metabolism (chemical reactions) is a classic example of the many cellular processes that use and produce energy. Living things consume sugar as a major energy source because sugar molecules have considerable energy stored within their bonds. Consumed carbohydrates have their origins in photosynthesizing organisms like plants. During photosynthesis, plants use the energy of sunlight to convert carbon dioxide gas into sugar molecules, like glucose. Because this...
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Triglycerides are a form of long-term energy storage molecules. They are made of glycerol and three fatty acids. To obtain energy from fat, triglycerides must first be broken down by hydrolysis into their two principal components, fatty acids and glycerol. This process, called lipolysis, takes place in the cytoplasm. The resulting fatty acids are oxidized by β-oxidation into acetyl-CoA, which is used by the Krebs cycle. The glycerol that is released from triglycerides after lipolysis...
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SN1 Reaction: Stereochemistry02:15

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This lesson provides an in-depth discussion of the stereochemical outcomes in an SN1 reaction.
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In an SN2 reaction, the reaction rate depends on both the type of nucleophile and the substrate. A hindered tertiary alkyl halide is practically inert to the SN2 mechanism despite using a strong nucleophile.
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SN1 Reaction: Mechanism02:25

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Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism. 
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A 1-Tetradecanol-1, 10-Decanediol Binary Eutectic Mixture/Expanded Graphite Composite Phase Change Materials for

Jun Yi1,2, Rongjun Hu2, Gaofei Zhan3

  • 1School of Environment and Chemical Engineering, Nanchang Hangkong University, Nanchang 330063, China.

Materials (Basel, Switzerland)
|January 28, 2026
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Summary

Researchers developed a novel composite phase change material using a eutectic system and expanded graphite. This material offers improved thermal conductivity and stability for building thermal management.

Keywords:
1,10-decanediol1-tetradecanolexpanded graphitephase change material

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Sustainable Energy

Background:

  • Organic phase change materials (PCMs) are crucial for thermal energy storage but face limitations like fixed phase change temperatures, leakage, and poor thermal conductivity.
  • These limitations hinder their scalable application in areas such as building thermal management.

Purpose of the Study:

  • To overcome the limitations of organic PCMs by developing a composite material with a wider operational temperature range and enhanced thermal properties.
  • To create a stable and efficient phase change material suitable for building thermal management.

Main Methods:

  • Preparation of a binary eutectic system using 1-tetradecanol and 1,10-decanediol.
  • Compositing the eutectic system with expanded graphite to form a composite phase change material.
  • Characterization of thermal properties, phase transition temperatures, latent heat, and cycling stability.

Main Results:

  • The composite material exhibited a significantly improved thermal conductivity of 4.642 W/(m·K), approximately 12 times that of the pure eutectic.
  • The material showed distinct phase transitions with melting and solidification points at 37.77 °C and 29.38 °C, respectively.
  • Excellent cycling stability was observed, retaining over 87% of latent heat after 2000 cycles, with minimal leakage.

Conclusions:

  • The developed composite phase change material offers a promising solution for building thermal management due to its enhanced thermal conductivity, tunable phase transition temperatures, and stability.
  • This work presents a systematic fabrication approach for composite PCMs, paving the way for advanced thermal energy storage solutions.