A DNA and Self-Doped Conjugated Polyelectrolyte Assembled for Organic Optoelectronics and Bioelectronics

Kim, Jung Yong; Selvakumaran, Nagamani; Liu, Lianlian; Ghazaly, Ahmed El; Solin, Niclas; Inganäs, Olle

doi:10.1021/acs.biomac.9b01667

Cited by 15 publications

(15 citation statements)

References 55 publications

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“…A future direction of the work could be to apply a technique such as neutron reflectometry to gain supporting insight into the interfacial structure including the volume fraction and thickness of the layers [ 18 , 52 ], although clearly this remains outside the scope of the present work. Given the use of DNA/polymer systems in research on gene delivery [ 53 ] and electronic devices [ 54 ], the new insight into the mechanism of formation of their nanostructures at interfaces provided by the present work can have a variety of future implications.…”

Section: Discussionmentioning

confidence: 99%

DNA Interaction with a Polyelectrolyte Monolayer at Solution—Air Interface

et al. 2021

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The formation of ordered 2D nanostructures of double stranded DNA molecules at various interfaces attracts more and more focus in medical and engineering research, but the underlying intermolecular interactions still require elucidation. Recently, it has been revealed that mixtures of DNA with a series of hydrophobic cationic polyelectrolytes including poly(N,N-diallyl-N-hexyl-N-methylammonium) chloride (PDAHMAC) form a network of ribbonlike or threadlike aggregates at the solution—air interface. In the present work, we adopt a novel approach to confine the same polyelectrolyte at the solution—air interface by spreading it on a subphase with elevated ionic strength. A suite of techniques–rheology, microscopy, ellipsometry, and spectroscopy–are applied to gain insight into main steps of the adsorption layer formation, which results in non-monotonic kinetic dependencies of various surface properties. A long induction period of the kinetic dependencies after DNA is exposed to the surface film results only if the initial surface pressure corresponds to a quasiplateau region of the compression isotherm of a PDAHMAC monolayer. Despite the different aggregation mechanisms, the micromorphology of the mixed PDAHMAC/DNA does not depend noticeably on the initial surface pressure. The results provide new perspective on nanostructure formation involving nucleic acids building blocks.

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Section: Discussionmentioning

confidence: 99%

DNA Interaction with a Polyelectrolyte Monolayer at Solution—Air Interface

et al. 2021

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“…If this correction is applied, the conductivity is about 2 S cm –1 , which corresponds well the measurement of a reference PEDOT-S film (1 S cm –1 ) and with previous reports. 58 …”

Section: Flexible Conductive Aerogels For Piezoresistive Pressure Sen...mentioning

confidence: 99%

Protein-Based Flexible Conductive Aerogels for Piezoresistive Pressure Sensors

Yuan

Solin

2022

ACS Appl. Bio Mater.

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Gelatin is an excellent gelling agent and is widely employed for hydrogel formation. Because of the poor mechanical properties of gelatin when dry, gelatin-aerogels are comparatively rare. Herein we demonstrate that protein nanofibrils can be employed to improve the mechanical properties of gelatin aerogels, and the materials can moreover be functionalized with a an electrically conductive polyelectrolyte resulting in formation of an elastic electrically conductive aerogel that can be employed as a piezoresistive pressure sensor. The aerogel sensor shows a good linear relationship in a wide pressure range (1.8–300 kPa) with a sensitivity of 1.8 kPa –1 . This work presents a convenient way to produce electrically conductive elastic aerogels from low-cost protein precursors.

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“…The unique properties of polyelectrolytes are governed by a multitude of nonlinearly coupled variables, making these systems notoriously difficult to study, both theoretically and in experiments. Needless to say, due to their novel features, polyelectrolyte systems have contributed immensely, both in understanding the fundamental physics of complex charged fluids, and for a wide range of real life applications, such as nano-filtration 5 , energy storage 6 , bioelectronics 7 , fabrication of novel materials for biomedical use 8 , and vaccines 9 , to name a few.…”

Section: Introductionmentioning

confidence: 99%

Macroscopic charge segregation in driven polyelectrolyte solutions

Bagchi

2022

Preprint

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Understanding the behavior of charged complex fluids is crucial for a plethora of important industrial, technological, and medical applications. Using coarse-grained molecular dynamics simulations, here we investigate the properties of a polyelectrolyte solution, with explicit counterions and implicit solvent, that is driven by a steady electric field. By properly tuning the interplay between interparticle electrostatics and the applied electric field, we uncover two nonequilibrium continuous phase transitions as a function of the driving field. The first transition occurs from a homogeneously mixed phase to a macroscopically charge segregated phase, in which the polyelectrolyte solution self-organizes to form two lanes of like-charges, parallel to the applied field. We show that the fundamental underlying factor responsible for the emergence of this charge segregation in the presence of electric field is the excluded volume interactions of the drifting polyelectrolyte chains. As the drive is increased further, a re-entrant transition is observed from a charge segregated phase to a homogeneous phase. The re-entrance is signaled by the decrease in mobility of the monomers and counterions, as the electric field is increased. Furthermore, with multivalent counterions, a counterintuitive regime of negative differential mobility is observed, in which the charges move progressively slower as the driving field is increased. We show that all these features can be consistently explained 1

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A DNA and Self-Doped Conjugated Polyelectrolyte Assembled for Organic Optoelectronics and Bioelectronics

Cited by 15 publications

References 55 publications

DNA Interaction with a Polyelectrolyte Monolayer at Solution—Air Interface

DNA Interaction with a Polyelectrolyte Monolayer at Solution—Air Interface

Protein-Based Flexible Conductive Aerogels for Piezoresistive Pressure Sensors

Macroscopic charge segregation in driven polyelectrolyte solutions

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