Tale of Alkyl Chains: Chain-Length Effect-Directed Formation of Complex Self-Assembly Behaviors at the Liquid/Solid Interface for Unsymmetrically Substituted Fluorenone Derivatives

2018 ◽  
Vol 122 (8) ◽  
pp. 4496-4506 ◽  
Author(s):  
Yi Hu ◽  
Kai Miao ◽  
Xinrui Miao ◽  
Wenli Deng
Keyword(s):  
Chain Length ◽  
Self Assembly ◽  
Length Effect ◽  
Alkyl Chains ◽  
Solid Interface

Two side chains, three supramolecules: exploration of fluorenone derivatives towards crystal engineering

2017 ◽  
Vol 19 (29) ◽  
pp. 19205-19216 ◽  
Author(s):  
Yi Hu ◽  
Kai Miao ◽  
Li Xu ◽  
Bao Zha ◽  
Mengying Long ◽  
...  
Keyword(s):  
Chain Length ◽  
Crystal Engineering ◽  
Self Assembly ◽  
The Self ◽  
Side Chains ◽  
Length Effect ◽  
Alkyl Chains

We explored the chain length effect on inducing the self-assembly of diverse structures by tiny modification of the alkyl chains.

Cooperating dipole–dipole and van der Waals interactions driven 2D self-assembly of fluorenone derivatives: ester chain length effect

2017 ◽  
Vol 19 (46) ◽  
pp. 31113-31120 ◽  
Author(s):  
Meiqiu Dong ◽  
Kai Miao ◽  
Yi Hu ◽  
Juntian Wu ◽  
Jinxing Li ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Chain Length ◽  
Self Assembly ◽  
Pyrolytic Graphite ◽  
Van Der Waals Interactions ◽  
Scanning Tunneling ◽  
Two Dimensional ◽  
Tunneling Microscopy ◽  
Length Effect ◽  
Ester Chain

Two-dimensional supramolecular assemblies of a series of 2,7-bis(10-n-alkoxycarbonyl-decyloxy)-9-fluorenone derivatives (BAF-Cn, n = 1, 3–6) consisting of polar fluorenone moieties and ester alkoxy chains were investigated by scanning tunneling microscopy on highly oriented pyrolytic graphite surfaces.

scholarly journals Alkyl chain length effects on double-deck assembly at a liquid/solid interface

Nanoscale ◽  
2018 ◽  
Vol 10 (31) ◽  
pp. 14993-15002 ◽  
Author(s):  
Yuan Fang ◽  
Mihaela Cibian ◽  
Garry S. Hanan ◽  
Dmitrii F. Perepichka ◽  
Steven De Feyter ◽  
...  
Keyword(s):  
Chain Length ◽  
Crystal Engineering ◽  
Self Assembly ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Solid Interface ◽  
Length Effects

Controlled double-deck packing is an appealing means to expand upon conventional 2D self-assembly which is critical in crystal engineering, yet it is rare and poorly understood.

Aggregation behavior of zwitterionic surface active ionic liquids with different counterions, cations, and alkyl chains

RSC Advances ◽  
2016 ◽  
Vol 6 (33) ◽  
pp. 27370-27377 ◽  
Author(s):  
Panpan Sun ◽  
Lijuan Shi ◽  
Fei Lu ◽  
Liqiang Zheng
Keyword(s):  
Ionic Liquids ◽  
Chain Length ◽  
Self Assembly ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Aggregation Behavior ◽  
The Self ◽  
Alkyl Chains ◽  
Surface Active

The effects of anionic type, cationic structure and alkyl chain length are illustrated to regulate the self-assembly of zwitterionic SAILs.

Directive Effect of Chain Length in Modulating Peptide Nano-assemblies

2020 ◽  
Vol 27 (9) ◽  
pp. 923-929
Author(s):  
Gaurav Pandey ◽  
Prem Prakash Das ◽  
Vibin Ramakrishnan
Keyword(s):  
Electron Microscopy ◽  
Amino Acids ◽  
Light Scattering ◽  
Chain Length ◽  
Self Assembly ◽  
The Self ◽  
Ionic Charge ◽  
Self Assembling ◽  
Biophysical Techniques

Background: RADA-4 (Ac-RADARADARADARADA-NH2) is the most extensively studied and marketed self-assembling peptide, forming hydrogel, used to create defined threedimensional microenvironments for cell culture applications. Objectives: In this work, we use various biophysical techniques to investigate the length dependency of RADA aggregation and assembly. Methods: We synthesized a series of RADA-N peptides, N ranging from 1 to 4, resulting in four peptides having 4, 8, 12, and 16 amino acids in their sequence. Through a combination of various biophysical methods including thioflavin T fluorescence assay, static right angle light scattering assay, Dynamic Light Scattering (DLS), electron microscopy, CD, and IR spectroscopy, we have examined the role of chain-length on the self-assembly of RADA peptide. Results: Our observations show that the aggregation of ionic, charge-complementary RADA motifcontaining peptides is length-dependent, with N less than 3 are not forming spontaneous selfassemblies. Conclusion: The six biophysical experiments discussed in this paper validate the significance of chain-length on the epitaxial growth of RADA peptide self-assembly.

scholarly journals Improvement of the thermal stability of dendritic silver-coated copper microparticles by surface modification based on molecular self-assembly

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Tae Hyeong Kim ◽  
Hyeji Kim ◽  
Hyo Jun Jang ◽  
Nara Lee ◽  
Kwang Hyun Nam ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Photoelectron Spectroscopy ◽  
Self Assembly ◽  
Electrically Conductive ◽  
X Ray ◽  
Alkyl Chains ◽  
Conductive Film ◽  
Initial Resistance ◽  
Thermal Stability Of ◽  
Scanning Electron

AbstractIn the study reported herein, silver-coated copper (Ag/Cu) powder was modified with alkanethiols featuring alkyl chains of different lengths, namely butyl, octyl, and dodecyl, to improve its thermal stability. The modification of the Ag/Cu powders with adsorbed alkanethiols was confirmed by scanning electron microscopy with energy dispersive spectroscopy, X-ray photoelectron spectroscopy, and thermogravimetric analysis. Each powder was combined with an epoxy resin to prepare an electrically conductive film. The results confirmed that the thermal stability of the films containing alkanethiol-modified Ag/Cu powders is superior to that of the film containing untreated Ag/Cu powder. The longer the alkyl group in the alkanethiol-modified Ag/Cu powder, the higher the initial resistance of the corresponding electrically conductive film and the lower the increase in resistance induced by heat treatment.

scholarly journals Studies of Polymer Solvation by Dielectric Relaxation Spectroscopy III: Polyvinyl Pyrrolidone in N-Methyl-2-Pyrrolidone, Ethanediol, Methanol, and Water

1990 ◽  
Vol 45 (2) ◽  
pp. 126-134
Author(s):  
E. Dachwitz
Keyword(s):  
Dielectric Relaxation ◽  
Chain Length ◽  
Molar Mass ◽  
Polyvinyl Pyrrolidone ◽  
Dielectric Relaxation Spectroscopy ◽  
Length Effect ◽  
Repeat Units ◽  
Solvent Model ◽  
Spectral Components ◽  
High Concentrations

AbstractThe permittivity of the title solutions has been measured at frequencies between some MHz and 72 GHz at 20 °C. Polyvinyl pyrrolidone of relative molar mass ranging from 1200 to 360 000 has been used. Referring to the concentration of monomeric repeat units (x = 0.65 maximum) there is no significant chain length effect. The permittivity data are described in terms of discrete Debye type spectral components. Special attention is paid to the contributions ascribable to the solvents, which are discussed with respect to their solvation behaviour. This can be described by a three state solvent model as follows. Besides the "bulk" solvent a further contribution is found in any case which is due to loosely affected (slowed down) solvent. Moreover a part of the solvent appears to be tightly bound to the polymer at high concentrations. All the solvents considered show similar solvation properties, notwithstanding their different tendencies towards selfassociation.

Synthesis and 2D self-assembly at the liquid–solid interface of novel H-bonding linear π-conjugated oligomers terminated by uracil and melamine units

2014 ◽  
Vol 38 (6) ◽  
pp. 2407-2413 ◽  
Author(s):  
G. Y. Y. Chng ◽  
X. Sun ◽  
S. J. Cho ◽  
D. Rajwar ◽  
A. C. Grimsdale ◽  
...  
Keyword(s):  
Self Assembly ◽  
Conjugated Oligomers ◽  
Solid Interface

2D self-assembly of a novel π-conjugated oligomer terminated by two uracil units is solvent dependent and involves multiple intermolecular H-bonds.

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