Epitaxial crystallization of alkane chain lipids for electron diffraction analysis.

Area of Science:

• Materials Science
• Crystallography
• Electron Microscopy

Background:

• Polymethylene chain materials exhibit diverse structures.
• Controlling crystal orientation is crucial for structural analysis.
• Epitaxial growth offers a method for crystal orientation control.

Purpose of the Study:

• To investigate the epitaxial growth of various polymethylene chain materials on naphthalene.
• To determine the crystal orientation achieved through this growth method.
• To assess the suitability of these epitaxially grown crystals for ab initio crystal structure analysis.

Main Methods:

• Epitaxial growth of microcrystals on naphthalene substrates.
• Electron diffraction intensity data collection.
• Ab initio quantitative crystal structure analysis from projected diffraction data.

Main Results:

• Successful epitaxial growth of n-alkanes, waxes, glycerides, detergents, and phospholipids on naphthalene.
• Achieved a consistent crystal orientation with long chain axes parallel to the naphthalene substrate.
• Demonstrated the feasibility of ab initio crystal structure determination from the obtained electron diffraction data.

Conclusions:

• Epitaxial growth on naphthalene provides a novel route to orient polymethylene chain materials.
• The resulting crystal orientation differs from solution-grown crystals.
• This technique facilitates accurate crystal structure analysis, particularly for materials challenging to crystallize.