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Boojum and stripe textures in long-range orientationally ordered monolayers on solid substrates.

Wenlang Liang¹, Tanmay Bera, Xuejun Zhang

¹Advanced Materials Processing and Analysis Center and Mechanical, Materials and Aerospace Engineering, University of Central Florida, Orlando, Florida 32826, United States.

Langmuir : the ACS Journal of Surfaces and Colloids

|December 23, 2010

Summary

Researchers preserved long-range molecular tilt order of pentadecanoic acid (PDA) monolayers on glass substrates. This "frozen" order, observed in boojum and stripe textures, enables alignment of liquid crystals.

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Area of Science:

Materials Science
Surface Chemistry
Condensed Matter Physics

Background:

Monolayers at the air-water interface exhibit striking long-range molecular tilt organization.
Pentadecanoic acid (PDA) monolayers form distinct boojum and stripe textures with continuous variations in molecular tilt azimuth at low temperatures.

Purpose of the Study:

To investigate the preservation of long-range molecular tilt order in PDA monolayers after transfer to solid substrates.
To explore the potential of transferred PDA monolayers as alignment layers for liquid crystals.

Main Methods:

Transfer of PDA monolayers from the air-water interface to glass substrates at low dipping speeds.
Frictional force microscopy (FFM) at room temperature to resolve the long-range tilt order.

Main Results:

PDA monolayers with boojum and stripe textures, exhibiting long-range molecular tilt order, were successfully transferred to glass substrates.
The tilt order in the transferred monolayers remained "frozen" at room temperature due to interactions with the glass surface.
The transferred stripe structures demonstrated the ability to induce continuous azimuthal orientation in nematic liquid crystals.

Conclusions:

Long-range molecular tilt order in PDA monolayers can be preserved upon transfer to solid substrates.
The interaction between PDA molecules and the glass surface effectively "freezes" the tilt order.
Transferred PDA stripe textures serve as effective alignment layers for nematic liquid crystals, enabling controlled azimuthal orientation.