Chiral self-assembly of fullerene clusters on CT-DNA templates

2018 ◽  
Vol 207 ◽  
pp. 459-469 ◽  
Author(s):  
Sandeepa Kulala Vittala ◽  
Joshy Joseph
Keyword(s):  
Self Assembly ◽  
Cluster Size ◽  
Dna Templates ◽  
Fullerene Clusters ◽  
Ct Dna

Fullerene nanoclusters with a unique cluster size (3–5 nm) interact with DNA forming chiral assemblies, thus perturbing the highly networked structure of CT-DNA.

scholarly journals Nucleation of Ga droplets self-assembly on GaAs(111)A substrates

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Artur Tuktamyshev ◽  
Alexey Fedorov ◽  
Sergio Bietti ◽  
Stefano Vichi ◽  
Riccardo Tambone ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Size Distribution ◽  
Self Assembly ◽  
Cluster Size ◽  
Droplet Size Distribution ◽  
Local Environment ◽  
The Self ◽  
Critical Cluster ◽  
Droplet Nucleation ◽  
High Degree

AbstractWe investigated the nucleation of Ga droplets on singular GaAs(111)A substrates in the view of their use as the seeds for the self-assembled droplet epitaxial quantum dots. A small critical cluster size of 1–2 atoms characterizes the droplet nucleation. Low values of the Hopkins-Skellam index (as low as 0.35) demonstrate a high degree of a spatial order of the droplet ensemble. Around $$350\,^{\circ }\hbox {C}$$ 350 ∘ C the droplet size distribution becomes bimodal. We attribute this observation to the interplay between the local environment and the limitation to the adatom surface diffusion introduced by the Ehrlich–Schwöbel barrier at the terrace edges.

Bio-Inspired Programmable Self-Assembly on DNA Templates

ChemInform ◽  
2006 ◽  
Vol 37 (43) ◽  
Author(s):  
Kentaro Tanaka ◽  
Mitsuhiko Shionoya
Keyword(s):  
Self Assembly ◽  
Dna Templates

scholarly journals Nanosheets and 2D-nanonetworks by mutually assisted self-assembly of fullerene clusters and DNA three-way junctions

2019 ◽  
Vol 1 (10) ◽  
pp. 4158-4165 ◽  
Author(s):  
Sandeepa Kulala Vittala ◽  
Sajena Kanangat Saraswathi ◽  
Anjali Bindu Ramesan ◽  
Joshy Joseph
Keyword(s):  
Self Assembly ◽  
Enhanced Fluorescence ◽  
Fullerene Clusters

Self-assembly of F-An nanoclusters with 3WJ-DNA and 3WJ-OH offers nanosheets and entangled 2D-nanonetworks, respectively. 3WJ-OH/F-An in the presence of AgNCs shows enhanced fluorescence (∼40%) due to its stabilization in the 2D-nanonetworks.

Bio-inspired Programmable Self-assembly on DNA Templates

2006 ◽  
Vol 35 (7) ◽  
pp. 694-699 ◽  
Author(s):  
Kentaro Tanaka ◽  
Mitsuhiko Shionoya
Keyword(s):  
Self Assembly ◽  
Dna Templates

scholarly journals Self-assembly of coated microdroplets at the sudden expansion of a microchannel

2021 ◽  
Vol 25 (3) ◽  
Author(s):  
Kerstin Schirrmann ◽  
Gabriel Cáceres-Aravena ◽  
Anne Juel
Keyword(s):  
Self Assembly ◽  
Cluster Size ◽  
Microfluidic Channel ◽  
Double Emulsion ◽  
Building Blocks ◽  
Critical Distance ◽  
Sudden Expansion ◽  
Coating Film ◽  
Multiple Cores ◽  
Parameter Values

AbstractWe report observations of the self-assembly of coated droplets into regular clusters at the sudden expansion of a microfluidic channel. A double emulsion consisting of a regular train of coated microdroplets was created upstream of the channel expansion, so that the inter-drop distance, droplet length, velocity and coating thickness could be varied by imposing different inlet pressures, albeit not independently. Provided that the enlarged channel remains sufficiently confined to prohibit propagation in double file, droplets can assemble sequentially into regular linear clusters at the expansion. Droplets join a cluster via the coalescence of their coating film with that of the group ahead. This coalescence occurs when the droplets approach each other to within a critical distance at the expansion, enabled by hydrodynamic interactions within the train. Clusters comprising a finite number of droplets are obtained because reconfiguration of the droplet assembly during coalescence increases the distance to the following droplet. Decreasing the inter-drop distance increases the cluster size up to a maximum value beyond which continuous clusters form. Formalising these observations in a simple model reveals that clusters of any size are possible but that they occur for increasingly narrow ranges of parameter values. Our experimental observations suggests that background experimental fluctuations limit the maximum discrete cluster size in practice. This method of self-assembly offers a robust alternative to flow focusing for encapsulating multiple cores in a single coating film and the potential to build more complex colloidal building blocks by de-confining the clusters.

scholarly journals Nucleation of Ga Droplets Self-Assembly on GaAs(111)A Substrates

2021 ◽  
Author(s):  
Artur Tuktamyshev ◽  
Alexey Fedorov ◽  
Sergio Bietti ◽  
Stefano Vichi ◽  
Riccardo Tambone ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Size Distribution ◽  
Self Assembly ◽  
Cluster Size ◽  
Droplet Size Distribution ◽  
Local Environment ◽  
The Self ◽  
Critical Cluster ◽  
Droplet Nucleation ◽  
High Degree

Abstract We investigated the nucleation of Ga droplets on exact GaAs(111)A substrates in the view of their use as the seeds for the self-assembly droplet epitaxial quantum dots. A small critical cluster size of 1-2 atoms characterizes the droplet nucleation. Low values of the Hopkins-Skellam index (as low as 0.35) demonstrate a high degree of a spatial order of the droplet ensemble. Around 350 °C the droplet size distribution becomes bimodal. We attribute this observation to the interplay between the local environment and the limitation to the adatom surface diffusion introduced by the Ehrlich-Schwöbel barrier at the terrace edges.

scholarly journals DNA Condensation Triggered by the Synergistic Self-Assembly of Tetraphenylethylene-Viologen Aggregates and CT-DNA

2021 ◽  
Vol 9 ◽  
Author(s):  
Sajena Kanangat Saraswathi ◽  
Varsha Karunakaran ◽  
Kaustabh Kumar Maiti ◽  
Joshy Joseph
Keyword(s):  
Self Assembly ◽  
Fluorescence Emission ◽  
Dna Condensation ◽  
Condensation Process ◽  
Cellular Delivery ◽  
Groove Binding ◽  
Binding Interaction ◽  
Morphological Studies ◽  
Condensing Agents ◽  
Ct Dna

Development of small organic chromophores as DNA condensing agents, which explore supramolecular interactions and absorbance or fluorescence-based tracking of condensation and gene delivery processes, is in the initial stages. Herein, we report the synthesis and electrostatic/groove binding interaction–directed synergistic self-assembly of the aggregates of two viologen-functionalized tetraphenylethylene (TPE-V) molecules with CT-DNA and subsequent concentration-dependent DNA condensation process. TPE-V molecules differ in their chemical structure according to the number of viologen units. Photophysical and morphological studies have revealed the interaction of the aggregates of TPE-V in Tris buffer with CT-DNA, which transforms the fibrous network structure of CT-DNA to partially condensed beads-on-a-string-like arrangement with TPE-V aggregates as beads via electrostatic and groove binding interactions. Upon further increasing the concentration of TPE-V, the “beads-on-a-string”-type assembly of TPE-V/CT-DNA complex changes to completely condensed compact structures with 40–50 nm in diameter through the effective charge neutralization process. Enhancement in the melting temperature of CT-DNA, quenching of the fluorescence emission of ethidium bromide/CT-DNA complex, and the formation of induced CD signal in the presence of TPE-V molecules support the observed morphological changes and thereby verify the DNA condensation abilities of TPE-V molecules. Decrease in the hydrodynamic size, increase in the zeta potential value with the addition of TPE-V molecules to CT-DNA, failure of TPE-V/cucurbit(8)uril complex to condense CT-DNA, and the enhanced DNA condensation ability of TPE-V2 with two viologen units compared to TPE-V1 with a single viologen unit confirm the importance of positively charged viologen units in the DNA condensation process. Initial cytotoxicity analysis on A549 cancer and WI-38 normal cells revealed that these DNA condensing agents are non-toxic in nature and hence could be utilized in further cellular delivery studies.

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