Ferro-self-assembly: magnetic and electrochemical adaptation of a multiresponsive zwitterionic metalloamphiphile showing a shape-hysteresis effect

We report on a novel multi-stimuli-responsive amphiphile, 1-(Z)-heptenyl-1’-dimethylammonium-methyl-(3-sulfopropyl)ferrocene (6), whose self-assembly properties can be altered by three different stimuli, namely: (i) the addition of external salts which serve to unfold the sultone headgroup, thus triggering self-assembly of 6 into vesicles; (ii) oxidation to 6+, which changes the lipophilic ferrocene to a hydrophilic ferrocenium entity, thereby broadening the size-distribution of the aggregates; and (iii) exposition of 6+ to an external magnetic field of 0.8 T. Under thease conditions and at sufficient concentration, 6+ forms large, tubular aggregates with lengths of up to 15 µm, which persist for over 5 min after the field is switched off again. 6+ is thus the first amphiphile to exhibit a shape-hysteresis effect. The self-assembly/disassembly processes and their dynamics were studied live and in situ by optical birefringence measurements coupled to light scattering.

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Ferro-Self-Assembly: Magnetic and Electrochemical Adaptation of a Multiresponsive Zwitterionic Metalloamphiphile Showing a Shape-Hysteresis Effect

10.26434/chemrxiv.12370406.v1 ◽

2020 ◽

Author(s):

Stefan Bitter ◽

Moritz Schlötter ◽

Markus Schilling ◽

Rainer Winter ◽

Sebastian Polarz

Keyword(s):

Magnetic Field ◽

External Magnetic Field ◽

Self Assembly ◽

Hysteresis Effect ◽

The Self ◽

Stimuli Responsive ◽

Tubular Aggregates ◽

Optical Birefringence ◽

Sufficient Concentration

We report on a novel multi-stimuli-responsive amphiphile, 1-(Z)-heptenyl-1’-dimethylammonium-methyl-(3-sulfopropyl)ferrocene (6), whose self-assembly properties can be altered by three different stimuli, namely: (i) the addition of external salts which serve to unfold the sultone headgroup, thus triggering self-assembly of 6 into vesicles; (ii) oxidation to 6+, which changes the lipophilic ferrocene to a hydrophilic ferrocenium entity, thereby broadening the size-distribution of the aggregates; and (iii) exposition of 6+ to an external magnetic field of 0.8 T. Under thease conditions and at sufficient concentration, 6+ forms large, tubular aggregates with lengths of up to 15 µm, which persist for over 5 min after the field is switched off again. 6+ is thus the first amphiphile to exhibit a shape-hysteresis effect. The self-assembly/disassembly processes and their dynamics were studied live and in situ by optical birefringence measurements coupled to light scattering.

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Study of stabilization of self-assembly processes in fullerene C60 solution

«Узбекский физический журнал» ◽

10.52304/.v23i3.257 ◽

2021 ◽

Vol 23 (3) ◽

pp. 12-14

Author(s):

U.K. Makhmanov ◽

A.M. Kokhkharov ◽

Sh.A. Esanov ◽

B.A. Aslonov ◽

B.A. Sindarov ◽

...

Keyword(s):

Refractive Index ◽

Light Scattering ◽

Dynamic Light Scattering ◽

Molecular Interactions ◽

Self Assembly ◽

Fullerene C60 ◽

Self Organization ◽

Final Size ◽

Initial Concentration ◽

Xylene Solution

The dynamics of changes in the values of the refractive index of solutions of C60 in xylene at various concentrations has been studied by the refractometric method. It was found that the deviation from the linear form of the dependence of the refractive index on the C60 concentration occurs at a C60 concentration of 1.8 mg/ml. The deviation is associated with the largest number of molecular interactions between C60−C60 and the formation of large nanoclusters on their basis in solution. It was found by the dynamic light scattering (DLS) that the final size of C60 nanoclusters in solution depends on the initial concentration of the solute. A higher initial concentration of C60 leads to the synthesis of nanoclusters with a larger diameter. Using the method of optical spectroscopy, the processes of self-organization of fullerene C60 molecules in a xylene solution in time are studied. The character of stability of synthesized fullerene nanoclusters in solution is discussed. The results obtained are of particular importance for numerous applications of nanotechnology for understanding self-assembly processes and the development of new nanomaterials.

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Dynamic light scattering and 31 P NMR study of the self-assembly of deoxyguanosine 5?-monophosphate: the effect of added salt

The European Physical Journal E ◽

10.1140/epje/e2004-00037-0 ◽

2004 ◽

Vol 13 (1) ◽

pp. 27-33 ◽

Cited By ~ 16

Author(s):

L. Spindler ◽

I. Dreven?ek-Olenik ◽

M. Copic ◽

J. Cerar ◽

J. ?kerjanc ◽

...

Keyword(s):

Light Scattering ◽

Dynamic Light Scattering ◽

Self Assembly ◽

The Self ◽

Nmr Study ◽

Added Salt

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Dynamic light scattering and 31P NMR spectroscopy study of the self-assembly of deoxyguanosine 5'-monophosphate

The European Physical Journal E ◽

10.1140/epje/i200101099 ◽

2002 ◽

Vol 7 (1) ◽

pp. 95-102 ◽

Cited By ~ 2

Author(s):

L. Spindler ◽

I. Drevenšek Olenik ◽

M. Čopič ◽

R. Romih ◽

J. Cerar ◽

...

Keyword(s):

Light Scattering ◽

Nmr Spectroscopy ◽

Dynamic Light Scattering ◽

Self Assembly ◽

31P Nmr ◽

The Self ◽

31P Nmr Spectroscopy ◽

Spectroscopy Study

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Directive Effect of Chain Length in Modulating Peptide Nano-assemblies

Protein and Peptide Letters ◽

10.2174/0929866527666200224114627 ◽

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.

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Cluster Self-Organization of Intermetallic Systems: Cs6 and Cs4 Metal Clusters and Cs11O3 Metal–Oxygen Cluster for the Self-Assembly of the (Cs4)(Cs6)(Cs11O3) Crystal Structure

Glass Physics and Chemistry ◽

10.1134/s1087659618050164 ◽

2018 ◽

Vol 44 (5) ◽

pp. 375-380

Author(s):

V. Ya. Shevchenko ◽

V. A. Blatov ◽

G. D. Ilyushin

Keyword(s):

Crystal Structure ◽

Self Assembly ◽

Metal Clusters ◽

The Self ◽

Self Organization ◽

Oxygen Cluster

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Guiding Self-Organization in Systems of Cooperative Mobile Agents

Advancing Artificial Intelligence through Biological Process Applications ◽

10.4018/978-1-59904-996-0.ch015 ◽

2011 ◽

pp. 268-290

Author(s):

Alejandro Rodríguez ◽

Alexander Grushin ◽

James A. Reggia

Keyword(s):

Swarm Intelligence ◽

Self Assembly ◽

The Self ◽

Self Organization ◽

Assembly System ◽

Global Behavior ◽

System A ◽

Collective Transport ◽

Reactive Behavior ◽

Different Levels

Drawing inspiration from social interactions in nature, swarm intelligence has presented a promising approach to the design of complex systems consisting of numerous, simple parts, to solve a wide variety of problems. Swarm intelligence systems involve highly parallel computations across space, based heavily on the emergence of global behavior through local interactions of components. This has a disadvantage as the desired behavior of a system becomes hard to predict or design. Here we describe how to provide greater control over swarm intelligence systems, and potentially more useful goal-oriented behavior, by introducing hierarchical controllers in the components. This allows each particle-like controller to extend its reactive behavior in a more goal-oriented style, while keeping the locality of the interactions. We present three systems designed using this approach: a competitive foraging system, a system for the collective transport and distribution of goods, and a self-assembly system capable of creating complex 3D structures. Our results show that it is possible to guide the self-organization process at different levels of the designated task, suggesting that self-organizing behavior may be extensible to support problem solving in various contexts.

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