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Confining ss-DNA/carbon nanotube complexes in ordered droplets.

F Tardani, C Pucci, C La Mesa

|July 2, 2014

Summary

This summary is machine-generated.

Researchers created stable liquid crystalline phases using DNA and carbon nanotubes. These nematic droplets, coated with protein or surfactant, show retained order and resist osmotic stress.

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Area of Science:

Materials Science
Nanotechnology
Biomaterials

Background:

Lyotropic nematic phases are liquid crystalline states formed by specific mixtures.
Single-stranded DNA and single-walled carbon nanotubes can self-assemble into ordered structures.
Controlling the stability and properties of these self-assembled nanomaterials is crucial for applications.

Purpose of the Study:

To investigate the formation of lyotropic nematic phases in single-stranded DNA and single-walled carbon nanotube mixtures.
To explore the stabilization of these nematic phases by dispersing them in protein or cationic surfactant solutions.
To characterize the resulting confined droplets and their retained liquid crystalline order.

Main Methods:

Preparation of 1/1 mass ratio mixtures of single-stranded DNA and single-walled carbon nanotubes.
Utilizing segregative phase separation to induce lyotropic nematic phase formation.
Confirmation of liquid crystalline order using optical polarizing microscopy and zero-shear rheology.
Dispersion of nematic droplets in protein or cationic surfactant solutions.
Analysis of droplet surface composition and structure using Scanning Electron Microscopy (SEM).

Main Results:

Lyotropic nematic phases were successfully formed in DNA-single-walled carbon nanotube mixtures.
Dispersing these nematic droplets in protein or surfactant solutions resulted in the formation of a stable, permanent peel.
The peel composition (protein or surfactant) depended on the titrant, while the core remained rich in DNA and nanotubes.
Scanning Electron Microscopy confirmed the distribution of components and partial retention of nematic order within the droplets.

Conclusions:

DNA-carbon nanotube mixtures can form stable lyotropic nematic phases.
A robust protective peel can be formed around these nematic droplets using proteins or surfactants, enhancing their stability.
The confined nematic droplets retain partial liquid crystalline order, suggesting potential for advanced material applications.