scholarly journals Understanding the multiscale self-assembly of metal–organic polyhedra towards functionally graded porous gels

2019 ◽  
Vol 10 (47) ◽  
pp. 10833-10842 ◽  
Author(s):  
Alexandre Legrand ◽  
Gavin A. Craig ◽  
Mickaele Bonneau ◽  
Saori Minami ◽  
Kenji Urayama ◽  
...  
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Self Assembly ◽  
Functionally Graded ◽  
Time Resolved ◽  
Assembly Mechanism ◽  
Metal Organic

Time-resolved dynamic light scattering unveiled the multiscale self-assembly mechanism of metal–organic polyhedra and allowed for inducing asymmetry in a porous gel.

scholarly journals Understanding of the Multiscale Self-Assembly of Metal-Organic Polyhedra Towards Functionally Graded Porous Gels

2019 ◽  
Author(s):  
alexandre legrand ◽  
Gavin A. Craig ◽  
Mickaele Bonneau ◽  
Saori Minami ◽  
Kenji Urayama ◽  
...  
Keyword(s):  
Self Assembly ◽  
Energy Transport ◽  
Soft Materials ◽  
Functionally Graded ◽  
Colloidal Gels ◽  
Time Resolved ◽  
Colloidal Aggregation ◽  
Synthetic Materials ◽  
Multiple Length Scales ◽  
Metal Organic

Spatial heterogeneity and gradients within porous materials are key for controlling their mechanical properties and mass/energy transport, both in biological and synthetic materials. However, it is still challenging to induce such complexity in well-defined microporous materials such as crystalline metal-organic frameworks (MOFs). Here we show a method to generate a continuous gradient of porosity over multiple length scales by taking advantage of the amorphous nature of supramolecular polymers based on metal-organic polyhedra (MOPs). First, we use time-resolved dynamic light scattering (TRDLS) to elucidate the mechanism of hierarchical self-assembly of MOPs into colloidal gels and to understand the relationship between the MOP concentrations and the architecture of the resulting colloidal networks. These features directly impact on the viscoelastic response of the gels and their mechanical strength. We then show that gradients of stiffness and porosity can be created within the gel by applying centrifugal force at the point of colloidal aggregation. These results with the creation of asymmetric and graded pore configuration in soft materials could lead to the emergence of advanced properties that are coupled to asymmetric molecule/ion transport as seen in biological systems.<br>

scholarly journals Understanding of the Multiscale Self-Assembly of Metal-Organic Polyhedra Towards Functionally Graded Porous Gels

2019 ◽  
Author(s):  
alexandre legrand ◽  
Gavin A. Craig ◽  
Mickaele Bonneau ◽  
Saori Minami ◽  
Kenji Urayama ◽  
...  
Keyword(s):  
Self Assembly ◽  
Energy Transport ◽  
Soft Materials ◽  
Functionally Graded ◽  
Colloidal Gels ◽  
Time Resolved ◽  
Colloidal Aggregation ◽  
Synthetic Materials ◽  
Multiple Length Scales ◽  
Metal Organic

Spatial heterogeneity and gradients within porous materials are key for controlling their mechanical properties and mass/energy transport, both in biological and synthetic materials. However, it is still challenging to induce such complexity in well-defined microporous materials such as crystalline metal-organic frameworks (MOFs). Here we show a method to generate a continuous gradient of porosity over multiple length scales by taking advantage of the amorphous nature of supramolecular polymers based on metal-organic polyhedra (MOPs). First, we use time-resolved dynamic light scattering (TRDLS) to elucidate the mechanism of hierarchical self-assembly of MOPs into colloidal gels and to understand the relationship between the MOP concentrations and the architecture of the resulting colloidal networks. These features directly impact on the viscoelastic response of the gels and their mechanical strength. We then show that gradients of stiffness and porosity can be created within the gel by applying centrifugal force at the point of colloidal aggregation. These results with the creation of asymmetric and graded pore configuration in soft materials could lead to the emergence of advanced properties that are coupled to asymmetric molecule/ion transport as seen in biological systems.<br>

scholarly journals Millimeter-Scale Zn(3-ptz)2 Metal–Organic Framework Single Crystals: Self-Assembly Mechanism and Growth Kinetics

ACS Omega ◽  
2021 ◽  
Author(s):  
Juan M. Garcia-Garfido ◽  
Javier Enríquez ◽  
Ignacio Chi-Durán ◽  
Iván Jara ◽  
Leonardo Vivas ◽  
...  
Keyword(s):  
Single Crystals ◽  
Growth Kinetics ◽  
Self Assembly ◽  
Metal Organic Framework ◽  
Assembly Mechanism ◽  
Metal Organic ◽  
Organic Framework

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.

Aqueous solubilization of hydrophobic supramolecular metal–organic nanocapsules

2014 ◽  
Vol 5 (6) ◽  
pp. 2554-2559 ◽  
Author(s):  
H. Kumari ◽  
S. R. Kline ◽  
J. L. Atwood
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Neutron Scattering ◽  
Metal Organic

Micelles of surfactant solubilized metal-seamed pyrogallol[4]arene based organic nanocapsules are synthesized and characterized using in situ neutron scattering and dynamic light scattering techniques, which show trends in sizes as a function of alkyl tails of pyrogallols and surfactants.

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.

scholarly journals Improved Dynamic Light Scattering using an adaptive and statistically driven time resolved treatment of correlation data

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Alexander V. Malm ◽  
Jason C. W. Corbett
Keyword(s):  
Steady State ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Size Fraction ◽  
Power Relationship ◽  
Time Resolved ◽  
Size Fractions ◽  
Use Of Data ◽  
Primary Advantage ◽  
State Size

Abstract Dynamic Light Scattering (DLS) is a ubiquitous and non-invasive measurement for the characterization of nano- and micro-scale particles in dispersion. The sixth power relationship between scattered intensity and particle radius is simultaneously a primary advantage whilst rendering the technique sensitive to unwanted size fractions from unclean lab-ware, dust and aggregated & dynamically aggregating sample, for example. This can make sample preparation iterative, challenging and time consuming and often requires the use of data filtering methods that leave an inaccurate estimate of the steady state size fraction and may provide no knowledge to the user of the presence of the transient fractions. A revolutionary new approach to DLS measurement and data analysis is presented whereby the statistical variance of a series of individually analysed, extremely short sub-measurements is used to classify data as steady-state or transient. Crucially, all sub-measurements are reported, and no data are rejected, providing a precise and accurate measurement of both the steady state and transient size fractions. We demonstrate that this approach deals intrinsically and seamlessly with the transition from a stable dispersion to the partially- and fully-aggregated cases and results in an attendant improvement in DLS precision due to the shorter sub measurement length and the classification process used.

From Hybrid Films to Mesoorganized Multi-metal-oxide Nanocrystalline Films (M3NF), preparation and characterization.

2004 ◽  
Vol 847 ◽  
Author(s):  
Cédric Boissière ◽  
David Grosso ◽  
Bernt Smarsly ◽  
Torsten Brezesinski ◽  
Sophie Lepoutre ◽  
...  
Keyword(s):  
Data Storage ◽  
Spectroscopic Ellipsometry ◽  
Self Assembly ◽  
Young Modulus ◽  
Processing Parameters ◽  
Dip Coating ◽  
Quasi Equilibrium ◽  
Mesoporous Films ◽  
Time Resolved ◽  
Assembly Mechanism

ABSTRACTHigh quality and reproducible thin silica and non-silica mesoporous films were obtained with mono-oriented organised mesoporosity, fitting various symmetry groups (i.e. p6m, Pm3n, Im3m, …). The Evaporation Induced Self Assembly (EISA) mechanism of structuration was studied through in-situ time-resolved SAXS, interferometry and spectroscopic ellipsometry investigations during dip-coating. A Modulable Steady State (MSS) was found during which the system is in quasi-equilibrium with its environment and during which the final structure is formed. The corresponding Self-Assembly mechanism was found to be governed by a competition between evaporation, micellization and condensation that depend on various critical chemical and processing parameters the influence of which have been summarized into directly usable phase diagrams. Calcined SiO2 and TiO2 mesoporous films structure (pore size and anisotropy, porous volume and surface) and mechanical properties (young modulus) were investigated by UV-Visible spectroscopic ellipsometry. Finally, thanks to a specially designed block copolymer, one further step was accomplished by achieving the dip coating and controlled nano-crystallisation of various metallic and multi-metal-oxides films (M3NF) of composition CoxTi(1-x)O(2-x) with ilmenite or doped Anatase structure, and SrTiO3 and MgTa2O6 with perovskite structure. Attending the well known magnetic, dielectric and catalytic properties of these structures, M3NF are highly compatible with high technology applications in microelectronic, energy transfer devices, spintronic, nano-mechanical adjustments, data storage, oxide fuel cells …

Synthesis and properties of multiheaded and multitailed surfactants based on tripentaerythritol

2015 ◽  
Vol 93 (5) ◽  
pp. 502-508 ◽  
Author(s):  
Nawal K. Paul ◽  
Tyler Mercer ◽  
Hussein Al-Mughaid ◽  
D. Gerrard Marangoni ◽  
Michael J. McAlduff ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Surface Tension ◽  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Self Assembly ◽  
Alkyl Chain ◽  
Alkyl Chain Length ◽  
Aggregation Behaviour ◽  
Aggregate Structures

The surface and self-assembly properties of a family of multiheaded, multitailed surfactants based on a tripentaerythritol backbone are described. Critical aggregation concentrations of these unusual surfactant systems have been determined from surface tension measurements; aggregate sizes in the presence and absence of a small amount of added electrolyte have been obtained via dynamic light scattering, and the morphologies of the aggregates were examined from electron microscopy measurements. In general, when compared to conventional ionic and two-headed surfactants (and other recently synthesized pentaerythritol derived surfactants from this group), these multiheaded surfactants exhibited some unusual trends in their aggregation behaviour and interesting aggregate structures in aqueous solution, as a function of alkyl chain length.

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