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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

Published on: April 19, 2018

Engineering nanometre-scale coherence in soft matter.

Chaoren Liu¹, Limin Xiang², Yuqi Zhang¹

¹Departments of Chemistry, Biochemistry and Physics, Duke University, Durham, North Carolina 27708, USA.

Nature Chemistry

|September 23, 2016

Summary

This summary is machine-generated.

Electronic delocalization in DNA is supported by guanine (G) runs. This study reveals an even-odd orbital-symmetry rule governing charge transport, enabling nanometre-scale coherence in DNA.

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Area of Science:

Molecular electronics
Biophysics
Materials science

Background:

Electronic delocalization in polymers can be hindered by environmental heterogeneity.
Persistent delocalization occurs when environmental effects on redox potential are smaller than monomer-monomer interactions.

Purpose of the Study:

To investigate charge transport and delocalization in guanine (G) runs within double-stranded DNA.
To explore the role of G-G interactions and orbital symmetry in DNA charge transport.

Main Methods:

Development of a molecular-resolution model for charge transport in DNA.
Utilizing break-junction experiments to test theoretical predictions.

Main Results:

Guanine runs in double-stranded DNA support delocalization over 4-5 bases.
Charge transport coherence follows an even-odd orbital-symmetry rule.
Weakening inter-strand G-block interactions enhances resistance oscillations.

Conclusions:

DNA sequence can be engineered to control the balance between coherent and incoherent charge transport.
Tailored orbital symmetry and structural fluctuations can achieve multi-nanometre coherent transport in DNA.
This principle is applicable to soft-matter assemblies, potentially mimicking charge transport in proteins.