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Updated: Jun 14, 2025

Preparation and Characterization of C60/Graphene Hybrid Nanostructures
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Published on: May 15, 2018

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来自原子学模拟的C60的压力和温度图

Karim Hakim1, Romain Dupuis2, Christophe Bichara1

  • 1CINaM, CNRS and Aix-Marseille Univ., Campus de Luminy, 13288 Marseille, Cedex 09, France.

The Journal of chemical physics
|September 3, 2024
PubMed
概括

研究人员利用三种碳电位探索了高压富勒烯转换. 结果显示,在预测无形sp3碳相和聚合过程中负热膨胀时,准确度不同.

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Phase Diagram

The phase of a given substance depends on the pressure and temperature. Thus, plots of pressure versus temperature showing the phase in each region provide considerable insights into the thermal properties of substances. Such plots are known as phase diagrams. For instance, in the phase diagram for water (Figure 1), the solid curve boundaries between the phases indicate phase transitions (i.e., temperatures and pressures at which the phases coexist).
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The pV diagram, which is a graph of pressure versus volume of the gas under study, is helpful in describing certain aspects of the substance. When the substance behaves like an ideal gas, the ideal gas equation describes the relationship between its pressure and volume. On a pV diagram, it is common to plot an isotherm, which is a curve showing p as a function of V with the number of molecules and the temperature fixed. Then, for an ideal gas, the product of the pressure of the gas and its...
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Cyclohexane does not exist in a planar form due to the high angle and torsional strain it would experience in the planar structure. Instead, it adopts non-planar chair and boat conformations.
The chair form is the most stable and derives its name from its resemblance to the “easy chair.” In the chair conformation, two carbon atoms are arranged out-of-plane — one above and one below, minimizing the torsional strain. In the chair form, the bond angle is very close to the ideal...
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The chair conformation is the most stable form of cyclohexane due to the absence of angle and torsional strain. The absence of angle strain is a result of cyclohexane’s bond angle being very close to the ideal tetrahedral bond angle of 109.5° in its chair conformer. Similarly, the torsional strain is also absent owing to the perfectly staggered arrangement of bonds.
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