A remarkable impact of a minor structural variation in the chain-end on the hierarchical self-assembly of a polymeric foldamer

2016 ◽  
Vol 7 (44) ◽  
pp. 6735-6743 ◽  
Author(s):  
Tathagata Mondal ◽  
Suhrit Ghosh
Keyword(s):  
Self Assembly ◽  
Structural Variation ◽  
Group Effect ◽  
Assembly Pathway ◽  
Naphthalene Diimide ◽  
A Minor ◽  
End Group

This article elucidates a remarkable end group effect on the macroscopic assembly pathway of chain folded polyurethanes (PU) PU-2 and PU-3, both of which contain a linear PU chain appended with n-type semiconducting naphthalene-diimide (NDI) chromophores.

Self-assembly pathway of nonsarcomeric myosin II

1991 ◽  
Vol 1991 (Supplement 14) ◽  
pp. 17-21 ◽  
Author(s):  
R. A. CROSS ◽  
T. P. HODGE ◽  
J. KENDRICK-JONES
Keyword(s):  
Self Assembly ◽  
Myosin Ii ◽  
Assembly Pathway

End-Group-Functionalized Poly(α-olefinates) as Non-Polar Building Blocks: Self-Assembly of Sugar-Polyolefin Hybrid Conjugates

2016 ◽  
Vol 128 (15) ◽  
pp. 4761-4765 ◽  
Author(s):  
Tessy S. Thomas ◽  
Wonseok Hwang ◽  
Lawrence R. Sita
Keyword(s):  
Self Assembly ◽  
Building Blocks ◽  
End Group

scholarly journals Redox-sensitive reversible self-assembly of amino acid–naphthalene diimide conjugates

2017 ◽  
Vol 7 (6) ◽  
pp. 20160099 ◽  
Author(s):  
Wathsala Liyanage ◽  
Paul W. Rubeo ◽  
Bradley L. Nilsson
Keyword(s):  
Amino Acid ◽  
Self Assembly ◽  
Functional Materials ◽  
Supramolecular Materials ◽  
Responsive Materials ◽  
Naphthalene Diimide ◽  
Reducing Conditions ◽  
Aqueous Solvent ◽  
Stimulus Responsive ◽  
Fibril Aggregates

Peptide and low molecular weight amino acid-based materials that self-assemble in response to environmental triggers are highly desirable candidates in forming functional materials with tunable biophysical properties. In this paper, we explore redox-sensitive self-assembly of cationic phenylalanine derivatives conjugated to naphthalene diimide (NDI). Self-assembly of the cationic Phe-NDI conjugates into nanofibrils was induced in aqueous solvent at high ionic strength. Under reducing conditions, these self-assembled Phe-NDI conjugate fibrils underwent a morphological change to non-fibril aggregates. Upon reoxidation, the initially observed fibrils were reformed. The study herein provides an interesting strategy to effect reversible switching of the structure of supramolecular materials that can be applied to the development of sophisticated stimulus-responsive materials.

scholarly journals Studies of the self-assembled growth mechanism on nanocrystalline silicon nanodots

2014 ◽  
Vol 6 (2) ◽  
Author(s):  
Samsudi Sakrani ◽  
Imam Sumpono ◽  
Nurul Aini Tarjudin ◽  
Zulkafli Othaman
Keyword(s):  
Self Assembly ◽  
Gas Flow ◽  
Nanocrystalline Silicon ◽  
Deposition Pressure ◽  
Experimental Conditions ◽  
Surface Energies ◽  
Corning Glass ◽  
Amorphous Si ◽  
A Minor ◽  
Solid Nucleation

Nanocrystalline silicon (nc-Si) nanodots have been grown on corning glass (7059) substrate using a self-assembly VHF-PECVD method under the following experimental conditions: Fixed deposition temperatures of 300/400 °C, deposition times 30/60 s, plasma power of 10 W, silane gas flow rate of 10 sccm, as well as deposition pressure of 10-2 torr. It is predicted that the onset of nucleation began immediately after the deposition and start to appear clearly after 20-60 s during which growth mechanisms occur. Essentially, the nanodots were formed onto the substrate in dome-like shapes by virtue of equilibrium surface energies, γLS, γLN andγNS. The associated liquid/solid nucleation mechanism was then simulated and related parameters were obtained: Free energy change per unit volume ΔGv ∼-104 Jmol-1; Surface energies per unit area, γLN = 1.44 Jm-2, γNS = 19 - 60 Jm-2 and γLS = 0.74 Jm-2; Critical energies ΔG* ∼10-15 J; Critical radii r* = 16 - 48 nm. These results were experimentally verified, in particular for selected critical radius r* less than 50 nm.Other measurements were also carried out: PL analysis gave bandgap energies ∼ 1.8-2.4 eV, whilst Raman spectra revealed the coexistence of nc-Si and amorphous Si. It is strongly suggested that, the nc-Si nanodot grown on glass substrate fulfills the Volmer-Weber growth mode with a minor modification.

scholarly journals Microribbons composed of directionally self-assembled nanoflakes as highly stretchable ionic neural electrodes

2020 ◽  
Vol 117 (26) ◽  
pp. 14667-14675 ◽  
Author(s):  
Mingchao Zhang ◽  
Rui Guo ◽  
Ke Chen ◽  
Yiliang Wang ◽  
Jiali Niu ◽  
...  
Keyword(s):  
Self Assembly ◽  
Structural Variation ◽  
Three Dimensional ◽  
Biological Tissues ◽  
Superior Performance ◽  
Ionic Conductors ◽  
Structural Variations ◽  
Neural Electrodes ◽  
Self Assembled

Many natural materials possess built-in structural variation, endowing them with superior performance. However, it is challenging to realize programmable structural variation in self-assembled synthetic materials since self-assembly processes usually generate uniform and ordered structures. Here, we report the formation of asymmetric microribbons composed of directionally self-assembled two-dimensional nanoflakes in a polymeric matrix during three-dimensional direct-ink printing. The printed ribbons with embedded structural variations show site-specific variance in their mechanical properties. Remarkably, the ribbons can spontaneously transform into ultrastretchable springs with controllable helical architecture upon stimulation. Such springs also exhibit superior nanoscale transport behavior as nanofluidic ionic conductors under even ultralarge tensile strains (>1,000%). Furthermore, to show possible real-world uses of such materials, we demonstrate in vivo neural recording and stimulation using such springs in a bullfrog animal model. Thus, such springs can be used as neural electrodes compatible with soft and dynamic biological tissues.

scholarly journals Revisiting the conformational state of albumin conjugated to gold nanoclusters: A self-assembly pathway to giant superstructures unraveled

PLoS ONE ◽  
2019 ◽  
Vol 14 (6) ◽  
pp. e0218975 ◽  
Author(s):  
Michał Kluz ◽  
Hanna Nieznańska ◽  
Robert Dec ◽  
Igor Dzięcielewski ◽  
Bartosz Niżyński ◽  
...  
Keyword(s):  
Self Assembly ◽  
Gold Nanoclusters ◽  
Conformational State ◽  
Assembly Pathway

Assembly of amino acid containing naphthalene diimide-based molecules: the role of intervening amide groups in self-assembly, gelation, optical and semiconducting properties

Soft Matter ◽  
2019 ◽  
Vol 15 (14) ◽  
pp. 3018-3026 ◽  
Author(s):  
Nibedita Nandi ◽  
Kousik Gayen ◽  
Arindam Banerjee
Keyword(s):  
Amino Acid ◽  
Self Assembly ◽  
Naphthalene Diimide ◽  
Semiconducting Properties

Two isomeric amino-acid containing naphthalene diimide based molecules differ in their respective assembly and the intervening amide groups plays an important role in gelation, optical and semiconducting nature of these molecules.

Golf ball-like architecture fabricated by supramolecular self-assembly of naphthalene diimide

RSC Advances ◽  
2016 ◽  
Vol 6 (45) ◽  
pp. 39392-39395 ◽  
Author(s):  
Santosh P. Goskulwad ◽  
Duong Duc La ◽  
Rajesh S. Bhosale ◽  
Mohammad Al Kobaisi ◽  
Sheshanath V. Bhosale ◽  
...  
Keyword(s):  
Self Assembly ◽  
Golf Ball ◽  
Naphthalene Diimide
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