Phase Behavior of DNA-Stabilized Carbon Nanotubes Dispersions: Association with Oppositely-Charged Additives

Tardani, Franco; Sennato, Simona

doi:10.1021/jp501792j

Cited by 11 publications

(21 citation statements)

References 46 publications

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“…Although much work has focused on the fundamental aspects of DNA-CNT hybridization, many recent reports have presented ideas for and demonstrations of biological applications [ 40 , 43 , 50 , 55 , 56 , 63 , 64 , 67 , 74 , 75 , 76 , 82 , 99 , 101 , 108 , 112 , 117 , 130 , 133 , 175 , 176 , 177 , 178 , 179 , 180 , 181 , 182 , 183 , 184 , 185 , 186 , 187 , 188 , 189 , 190 , 191 , 192 , 193 , 194 , 195 , 196 , 197 , 198 , 199 , 200 ]. The following describes several examples.…”

Section: Biological Applicationsmentioning

confidence: 99%

Hybrids of Nucleic Acids and Carbon Nanotubes for Nanobiotechnology

Umemura

2015

Nanomaterials

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Recent progress in the combination of nucleic acids and carbon nanotubes (CNTs) has been briefly reviewed here. Since discovering the hybridization phenomenon of DNA molecules and CNTs in 2003, a large amount of fundamental and applied research has been carried out. Among thousands of papers published since 2003, approximately 240 papers focused on biological applications were selected and categorized based on the types of nucleic acids used, but not the types of CNTs. This survey revealed that the hybridization phenomenon is strongly affected by various factors, such as DNA sequences, and for this reason, fundamental studies on the hybridization phenomenon are important. Additionally, many research groups have proposed numerous practical applications, such as nanobiosensors. The goal of this review is to provide perspective on biological applications using hybrids of nucleic acids and CNTs.

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Section: Biological Applicationsmentioning

confidence: 99%

Hybrids of Nucleic Acids and Carbon Nanotubes for Nanobiotechnology

Umemura

2015

Nanomaterials

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“…Answers to their disparate behaviors may lie in the physical origin of inter-hybrid attraction which likely differs from that of inter-dsDNA attraction. In a recent effort, Tardani 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 5 polyelectrolytes 30 . Mechanistic studies are called for to fully elucidate the relation between interhybrid interactions and resultant condensate structures.…”

Section: Introductionmentioning

confidence: 99%

Nanoscale Structure and Interaction of Condensed Phases of DNA–Carbon Nanotube Hybrids

Qiu

2015

J. Phys. Chem. C

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Condensation of DNA-carbon nanotube (CNT) hybrids dispersed in aqueous solutions can be induced by elevated hybrid concentrations, salts, or crowding agents. DNA-CNT condensates exhibit either nematic ordering or amorphous aggregates, dependent on the nature of inter-hybrid interactions. This study employed x-ray diffraction (XRD) to determine nanoscale structures of the condensates, including the presence of positional ordering, inter-axial distances, and the range of ordered domains. To probe the effects of DNA sequence, two types of CNT hybrids, dispersed by genomic DNA of random sequence and synthetic oligonucleotides respectively, were studied under identical conditions. The osmotic stress method was further used to quantify force-distance dependencies of the DNA-CNT hybrids to elucidate the relation between interhybrid interactions and condensate structures. We observed that, independent of DNA sequence, lyotropic DNA-CNT phases showed weak positional ordering with long inter-hybrid distances, salt-induced condensates were amorphous, crowding-condensed DNA-CNTs were the most ordered with pronounced XRD peaks, and inter-hybrid interactions were defined by short-range hydration repulsion and long-range electrostatic repulsion. Conversely, the effects of DNA sequence became evident as to their quantitative force-distance relationships. Genomic DNA of random sequence consistently gave longer inter-hybrid distances than synthetic oligonucleotides, which we attribute to the likely differences in their hybrid diameters.

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“…The process depends on the complex and on the conformational states allowed to it. On such grounds, 1/1 ss-DNA/CNT complexes are similar to double strand DNA, ds-DNA [ 32 , 33 ]. Therefore, similarities between complexes and ds-DNA are a realistic working hypothesis.…”

Section: Discussionmentioning

confidence: 99%

Titration of DNA/Carbon Nanotube Complexes with Double-Chained Oppositely Charged Surfactants

Tardani

Mesa

2015

Nanomaterials

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1/1 dispersions of ss-DNA/CNT complexes in mass ratios were investigated in a mixture with didodecyldimethylammonium bromide, DDAB. Depending on the amounts of the surface-active agent and of the complexes, solutions, precipitates, or re-dissolution occur. DDAB titrates the phosphate groups on the outer surface of the complex and controls the phase sequence in these systems. The combination of different experimental methods determined the phases that occur therein. The results are based on optical absorbance, Dynamic Light Scattering, ionic conductivity, ζ-potential, optical microscopy and AFM. From the above findings a (pseudo)-binary phase diagram is attained. The system has strong similarities with polymer-surfactant mixtures. In fact, its properties conform to cases in which interactions between rigid rod-like polyelectrolytes and oppositely charged species take place. The peculiarities of double-chained DDAB in the process imply significant differences with respect to the behavior of single chain surfactants. In fact, DDAB associates into vesicular entities, when the homologous single chain species forms small micellar aggregates.

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Phase Behavior of DNA-Stabilized Carbon Nanotubes Dispersions: Association with Oppositely-Charged Additives

Cited by 11 publications

References 46 publications

Hybrids of Nucleic Acids and Carbon Nanotubes for Nanobiotechnology

Hybrids of Nucleic Acids and Carbon Nanotubes for Nanobiotechnology

Nanoscale Structure and Interaction of Condensed Phases of DNA–Carbon Nanotube Hybrids

Titration of DNA/Carbon Nanotube Complexes with Double-Chained Oppositely Charged Surfactants

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