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Physical Properties of Alkanes02:33

Physical Properties of Alkanes

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Alkanes are nonpolar molecules due to the presence of only carbon and hydrogen atoms. The electronegativity difference between carbon and hydrogen is minimal, and hence alkanes have a zero dipole moment. This leads to the presence of only dispersion forces between the molecules. The strength of dispersion forces is dependent on the surface area of the molecules on which they act. Since the surface area increases with the molecular length for straight-chain alkanes, the dispersion forces also...
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At room temperature, the chair conformer of cyclohexane undergoes rapid ring flipping between two equivalent chair conformers at a rate of approximately 105 times per second. These two chair conformers are in equilibrium. The rapid ring flipping results in the interconversion of the axial proton to an equatorial proton and an equatorial to the axial proton. Such interconversions are too rapid and cannot be detected on the NMR timescale. Hence, the NMR spectrometer cannot distinguish between the...
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Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
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The axial and equatorial protons in cyclohexane can be distinguished by performing a variable-temperature NMR experiment. In this process, except for one proton, the remaining eleven protons are replaced by deuterium. The deuterium substitution avoids the possible peak splitting caused by the spin-spin coupling between the adjacent protons. The remaining proton flips between the axial and equatorial positions.
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This lesson delves into the mass spectrometry of branched alkane fragmentation. Branched alkanes possess secondary or tertiary carbon atoms, which generate relatively stable carbocations if the cleavage occurs at the branching point. The high stability of carbocations drives the instant fragmentation of branched alkanes. Accordingly, the branched alkane's molecular ion peak is very weak or invisible in the mass spectra, especially in comparison to a linear alkane.
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Organic compounds of the same molecular formula can have different structural formulas called constitutional isomers, and the phenomenon is known as constitutional isomerism. Alkanes with four or more carbons showing multiple structures with the same molecular formula thereby exhibit constitutional isomerism.
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Microencapsulated Alkane Wax Melting: Measured by 1H NMR Relaxometry and Diffusometry.

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Microencapsulation of n-alkane waxes like octadecane and eicosane disrupts their molecular order, creating an intermediate mobility domain. This disordering increases heterogeneity and broadens the melting point range for phase change materials (PCMs).

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energy Storage

Background:

  • Phase change materials (PCMs) are crucial for energy storage applications.
  • N-alkane waxes, such as octadecane and eicosane, possess high latent heats, making them effective PCMs.
  • Microencapsulation is a technique used to improve the stability and performance of PCMs.

Purpose of the Study:

  • To investigate the molecular-level effects of microencapsulation on n-alkane waxes (octadecane and eicosane).
  • To analyze the melting behavior of both unencapsulated and microencapsulated waxes using advanced NMR techniques.
  • To understand how microencapsulation influences the heterogeneity and melting point range of these PCMs.

Main Methods:

  • Utilized NMR relaxometry (T2 relaxation, T1-T2 correlated relaxation) and diffusometry (PGStE measurements).
  • Studied octadecane and eicosane in both unencapsulated and microencapsulated forms.
  • Acquired measurements across the melting point range at degree-wise temperature increments.

Main Results:

  • Microencapsulation induced molecular-level disordering in the solid waxes, creating a significant intermediate mobility domain.
  • This pseudo interface domain suggests disruption of long-range order and increased heterogeneity.
  • NMR diffusometry confirmed literature values for diffusion coefficients in wax melts and provided insights into solid-state transport mechanisms.

Conclusions:

  • Microencapsulation significantly alters the solid-state properties of n-alkane waxes, leading to increased heterogeneity.
  • The observed molecular disordering and extended melting range are key consequences of microencapsulation.
  • NMR techniques provide valuable molecular-level insights into the behavior of PCMs during phase transitions.