scholarly journals Dynamic cross-linking of an alginate–acrylamide tough hydrogel system: time-resolved in situ mapping of gel self-assembly

RSC Advances ◽  
2021 ◽  
Vol 11 (18) ◽  
pp. 10710-10726
Author(s):  
Akanksha Pragya ◽  
Suhas Mutalik ◽  
Muhammad Waseem Younas ◽  
Siu-Kwong Pang ◽  
Pui-Kin So ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Formation Process ◽  
Self Assembly ◽  
Cross Linking ◽  
Time Resolved ◽  
System Time ◽  
Dynamic Formation ◽  
Hydrogel System

In situ, time-resolved characterisation of an alginate–acrylamide tough hydrogel dynamic formation process indicate routes to intervention and modification of chemo-physico-mechanical properties.

In situ Time-Resolved Small-Angle X-ray Scattering Reveals the Formation Kinetics of Polyelectrolyte Complex Micelles

2019 ◽  
Author(s):  
Hao Wu ◽  
Jeffrey Ting ◽  
Siqi Meng ◽  
Matthew Tirrell
Keyword(s):  
Small Angle ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Polyelectrolyte Complex ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering ◽  
Kinetics Of ◽  
Ray Scattering

We have directly observed the <i>in situ</i> self-assembly kinetics of polyelectrolyte complex (PEC) micelles by synchrotron time-resolved small-angle X-ray scattering, equipped with a stopped-flow device that provides millisecond temporal resolution. This work has elucidated one general kinetic pathway for the process of PEC micelle formation, which provides useful physical insights for increasing our fundamental understanding of complexation and self-assembly dynamics driven by electrostatic interactions that occur on ultrafast timescales.

Investigation of the Formation Process of Photodeposited Rh Nanoparticles on TiO2by In Situ Time-Resolved Energy-Dispersive XAFS Analysis

Langmuir ◽  
2010 ◽  
Vol 26 (17) ◽  
pp. 13907-13912 ◽  
Author(s):  
Junya Ohyama ◽  
Kentaro Teramura ◽  
Shin-ichi Okuoka ◽  
Seiji Yamazoe ◽  
Kazuo Kato ◽  
...  
Keyword(s):  
Formation Process ◽  
Energy Dispersive ◽  
Time Resolved

pH- and Reductant-Responsive Polymeric Vesicles with Robust Membrane-Cross-Linked Structures: In Situ Cross-Linking in Polymerization-Induced Self-Assembly

2019 ◽  
Vol 52 (3) ◽  
pp. 1140-1149 ◽  
Author(s):  
Miao Chen ◽  
Jia-Wei Li ◽  
Wen-Jian Zhang ◽  
Chun-Yan Hong ◽  
Cai-Yuan Pan
Keyword(s):  
Self Assembly ◽  
Cross Linking ◽  
Polymeric Vesicles

scholarly journals In Situ Time-Resolved SAXS Study of the Formation of Mesostructured Organically Modified Silica through Modeling of Micelles Evolution during Surfactant-Templated Self-Assembly

Langmuir ◽  
2012 ◽  
Vol 28 (50) ◽  
pp. 17477-17493 ◽  
Author(s):  
Florentin Michaux ◽  
Niki Baccile ◽  
Marianne Impéror-Clerc ◽  
Luca Malfatti ◽  
Nicolas Folliet ◽  
...  
Keyword(s):  
Self Assembly ◽  
Modified Silica ◽  
Time Resolved ◽  
Organically Modified ◽  
Organically Modified Silica

In Situ Time-Resolved X-Ray Diffraction of Tobermorite Formation Process Under Autoclave Condition

2010 ◽  
Vol 93 (9) ◽  
pp. 2667-2674 ◽  
Author(s):  
Jun Kikuma ◽  
Masamichi Tsunashima ◽  
Tetsuji Ishikawa ◽  
Shin-Ya Matsuno ◽  
Akihiro Ogawa ◽  
...  
Keyword(s):  
Formation Process ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray

scholarly journals Pathway Complexity in Supramolecular Porphyrin Self-Assembly at an Immiscible Liquid|Liquid Interface

2021 ◽  
Author(s):  
Iván Robayo-Molina ◽  
Andrés F. Molina-Osorio ◽  
Luke Guinane ◽  
Syed A.M. Tofail ◽  
Micheal D. Scanlon
Keyword(s):  
Self Assembly ◽  
Immiscible Liquid ◽  
Bulk Solution ◽  
Time Resolved ◽  
Force Microscopy ◽  
Atomic Force ◽  
Aggregate Growth ◽  
High Concentrations ◽  
Thermodynamic Processes

<p>Nanostructures that are inaccessible through spontaneous thermodynamic processes may be formed by supramolecular self-assembly under kinetic control. In the past decade, the dynamics of pathway complexity in self-assembly have been elucidated through kinetic models based on aggregate growth by sequential monomer association and dissociation. Immiscible liquid|liquid interfaces are an attractive platform to develop well-ordered self-assembled nanostructures, unattainable in bulk solution, due to the templating interaction of the interface with adsorbed molecules. Here, we report time-resolved <i>in situ</i> UV/vis spectroscopic observations of the self-assembly of zinc(II) meso-tetrakis(4-carboxyphenyl)porphyrin (ZnTPPc) at an immiscible aqueous|organic interface. We show that the kinetically favoured metastable J-type nanostructures form quickly, but then transform into stable thermodynamically favoured H-type nanostructures. Numerical modelling revealed two parallel and competing cooperative pathways leading to the different porphyrin nanostructures. These insights demonstrate that pathway complexity is not unique to self-assembly processes in bulk solution, and equally valid for interfacial self-assembly. Subsequently, the interfacial electrostatic environment was tuned using a kosmotropic anion (citrate) in order to control the influence the pathway selection. At high concentrations, interfacial nanostructure formation was forced completely down the kinetically favoured pathway and only J-type nanostructures were obtained. Furthermore, we found by atomic force microscopy (AFM) and scanning electron microscopy (SEM) that the J- and H-type nanostructures obtained at low and high citric acid concentrations, respectively, are morphologically distinct, which illustrates the pathway-dependent material properties.</p>

Polymerization-induced self-assembly for the fabrication of polymeric nano-objects with enhanced structural stability by cross-linking

2020 ◽  
Vol 11 (22) ◽  
pp. 3654-3672 ◽  
Author(s):  
Wen-Jian Zhang ◽  
Jamshid Kadirkhanov ◽  
Chang-Hui Wang ◽  
Sheng-Gang Ding ◽  
Chun-Yan Hong ◽  
...  
Keyword(s):  
Structural Stability ◽  
Self Assembly ◽  
Cross Linking ◽  
The Cross

This review discusses the strategies of core-cross-linking in most of the PISA literatures (including post-polymerization cross-linking, photo-cross-linking and in situ cross-linking) and the applications of the cross-linked nano-objects.

In Situ Cross-linking Polymerization-Induced Self-Assembly: Not Only Generates Cross-linked Structures But Also Promotes Morphology Transition by the Cross-linker

2021 ◽  
Author(s):  
Jamshid Kadirkhanov ◽  
Cheng-Lin Yang ◽  
Zi-Xuan Chang ◽  
Ren-Man Zhu ◽  
Cai-Yuan Pan ◽  
...  
Keyword(s):  
Self Assembly ◽  
Cross Linking ◽  
Morphology Transition ◽  
Convenient Approach ◽  
Cross Linker ◽  
The Cross

Compared with the post-polymerization cross-linking strategy, in situ cross-linking by divinyl comonomers in polymerization-induced self-assembly (PISA) is a more straightforward and convenient approach to produce structurally stabilized nano-objects. However, cross-linking...

scholarly journals Pathway Complexity in Supramolecular Porphyrin Self-Assembly at an Immiscible Liquid|Liquid Interface

2021 ◽  
Author(s):  
Iván Robayo-Molina ◽  
Andrés F. Molina-Osorio ◽  
Luke Guinane ◽  
Syed A.M. Tofail ◽  
Micheal D. Scanlon
Keyword(s):  
Self Assembly ◽  
Immiscible Liquid ◽  
Bulk Solution ◽  
Time Resolved ◽  
Force Microscopy ◽  
Atomic Force ◽  
Aggregate Growth ◽  
High Concentrations ◽  
Thermodynamic Processes

<p>Nanostructures that are inaccessible through spontaneous thermodynamic processes may be formed by supramolecular self-assembly under kinetic control. In the past decade, the dynamics of pathway complexity in self-assembly have been elucidated through kinetic models based on aggregate growth by sequential monomer association and dissociation. Immiscible liquid|liquid interfaces are an attractive platform to develop well-ordered self-assembled nanostructures, unattainable in bulk solution, due to the templating interaction of the interface with adsorbed molecules. Here, we report time-resolved <i>in situ</i> UV/vis spectroscopic observations of the self-assembly of zinc(II) meso-tetrakis(4-carboxyphenyl)porphyrin (ZnTPPc) at an immiscible aqueous|organic interface. We show that the kinetically favoured metastable J-type nanostructures form quickly, but then transform into stable thermodynamically favoured H-type nanostructures. Numerical modelling revealed two parallel and competing cooperative pathways leading to the different porphyrin nanostructures. These insights demonstrate that pathway complexity is not unique to self-assembly processes in bulk solution, and equally valid for interfacial self-assembly. Subsequently, the interfacial electrostatic environment was tuned using a kosmotropic anion (citrate) in order to control the influence the pathway selection. At high concentrations, interfacial nanostructure formation was forced completely down the kinetically favoured pathway and only J-type nanostructures were obtained. Furthermore, we found by atomic force microscopy (AFM) and scanning electron microscopy (SEM) that the J- and H-type nanostructures obtained at low and high citric acid concentrations, respectively, are morphologically distinct, which illustrates the pathway-dependent material properties.</p>

scholarly journals Bioinspired Photo-Crosslinkable Self-Assembling Peptide with pH-Switchable “On−Off” Luminescence.

2021 ◽  
Author(s):  
Raffaele Pugliese ◽  
Monica Montuori ◽  
Fabrizio Gelain
Keyword(s):  
Self Assembly ◽  
Cross Linking ◽  
Significant Progress ◽  
The Past ◽  
Self Assembling ◽  
Made In

Significant progress has been made in the peptides self-assembly over the past two decades, however the in situ cross-linking of self-assembling peptides yielding to better performing nanomaterials is still in...

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