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

2021 ◽  
Vol 12 (1) ◽  
pp. 270-281
Author(s):  
Stefan Bitter ◽  
Moritz Schlötter ◽  
Markus Schilling ◽  
Marina Krumova ◽  
Sebastian Polarz ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Real Time ◽  
Self Assembly ◽  
Hysteresis Effect ◽  
The Self ◽  
Self Organization ◽  
Stimuli Responsive ◽  
Optical Birefringence

The self-organization properties of a stimuli responsive amphiphile can be altered by subjecting the paramagnetic oxidized form to a magnetic field of 0.8 T and monitored in real time by coupling optical birefringence with dynamic light scattering.

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

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-(<i>Z</i>)-heptenyl-1’-dimethylammonium-methyl-(3-sulfopropyl)ferrocene<b> </b>(<b>6</b>), 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 <b>6</b> into vesicles; (ii) oxidation to <b>6<sup>+</sup></b>, which changes the lipophilic ferrocene to a hydrophilic ferrocenium entity, thereby broadening the size-distribution of the aggregates; and (iii) exposition of <b>6<sup>+</sup> </b>to an external magnetic field of 0.8 T. Under thease conditions and at sufficient concentration, <b>6</b><sup><b>+</b> </sup>forms large, tubular aggregates with lengths of up to 15 µm, which persist for over 5 min after the field is switched off again. <b>6<sup>+</sup></b> 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. <br>

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

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-(<i>Z</i>)-heptenyl-1’-dimethylammonium-methyl-(3-sulfopropyl)ferrocene<b> </b>(<b>6</b>), 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 <b>6</b> into vesicles; (ii) oxidation to <b>6<sup>+</sup></b>, which changes the lipophilic ferrocene to a hydrophilic ferrocenium entity, thereby broadening the size-distribution of the aggregates; and (iii) exposition of <b>6<sup>+</sup> </b>to an external magnetic field of 0.8 T. Under thease conditions and at sufficient concentration, <b>6</b><sup><b>+</b> </sup>forms large, tubular aggregates with lengths of up to 15 µm, which persist for over 5 min after the field is switched off again. <b>6<sup>+</sup></b> 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. <br>

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

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.

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

2004 ◽  
Vol 13 (1) ◽  
pp. 27-33 ◽  
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

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

2002 ◽  
Vol 7 (1) ◽  
pp. 95-102 ◽  
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

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.

Guiding Self-Organization in Systems of Cooperative Mobile Agents

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.

Stimuli-responsive Supramolecular Gels Based on the Self-Assembly of stigmasterol-ferrocene derivative

2020 ◽  
Vol 39 ◽  
pp. 100321
Author(s):  
Jiacheng Wang ◽  
Min Chen ◽  
Haitian Zhao ◽  
Hua Zhang ◽  
Xin Yang
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Stimuli Responsive ◽  
Ferrocene Derivative ◽  
Supramolecular Gels

scholarly journals FPGA-based real-time autocorrelator and its application in dynamic light scattering

Optik ◽  
2019 ◽  
Vol 194 ◽  
pp. 163047
Author(s):  
Akhmarzhan Islambek ◽  
Kecheng Yang ◽  
Wei Li ◽  
Kai Li
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Real Time
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