Direct synthesis and structural characterisation of tri- and tetra-nuclear silver metallaknotanes by self-assembly approach

2008 ◽  
pp. 6191 ◽  
Author(s):  
Julien Bourlier ◽  
Abdelaziz Jouaiti ◽  
Nathalie Kyritsakas-Gruber ◽  
Lionel Allouche ◽  
Jean-Marc Planeix ◽  
...  
Keyword(s):  
Self Assembly ◽  
Direct Synthesis ◽  
Structural Characterisation

Aggregation behavior of tetraphenylporphyrin in aqueous surfactant solutions: Chiral premicellar J-aggregate formation

2015 ◽  
Vol 19 (07) ◽  
pp. 845-851 ◽  
Author(s):  
Margaret A. Gradova ◽  
Vladimir V. Artemov ◽  
Anton V. Lobanov
Keyword(s):  
Anionic Surfactant ◽  
Self Assembly ◽  
Photophysical Properties ◽  
Direct Synthesis ◽  
Aggregate Formation ◽  
Experimental Conditions ◽  
Aggregation State ◽  
Supramolecular Chirality ◽  
Surfactant Solutions ◽  
Surfactant Interactions

Porphyrin-surfactant interactions in aqueous solutions are known to result in the selfassembly of various supramolecular structures, including pigment-surfactant complexes, J- and H-aggregates, and solubilized dye species. Detailed studies on the mechanisms of the intermolecular interactions governing the above self-assembly processes allow to predict the aggregation state and hence, the photophysical properties of the dye-surfactant assemblies in order to perform a direct synthesis of the desired porphyrin-based nanostructures at the appropriate experimental conditions. This paper describes a novel example of the surfactant-induced J-aggregate formation from the diprotonated hydrophobic tetraphenylporphyrin species in submicellar aqueous anionic surfactant solutions. The above assemblies are characterized by a rod-like morphology and possess supramolecular chirality according to the CD measurements.

scholarly journals Reaction Monitoring and Structural Characterisation of Coordination Driven Self-Assembled Systems by Ion Mobility-Mass Spectrometry

2021 ◽  
Vol 9 ◽  
Author(s):  
Oscar H. Lloyd Williams ◽  
Nicole J. Rijs
Keyword(s):  
Mass Spectrometry ◽  
Ion Mobility ◽  
Self Assembly ◽  
Functional Materials ◽  
Ion Mobility Mass Spectrometry ◽  
Complex Species ◽  
Structural Characterisation ◽  
Analytical Technique ◽  
Complex Processes ◽  
Analytical Approaches

Nature creates exquisite molecular assemblies, required for the molecular-level functions of life, via self-assembly. Understanding and harnessing these complex processes presents an immense opportunity for the design and fabrication of advanced functional materials. However, the significant industrial potential of self-assembly to fabricate highly functional materials is hampered by a lack of knowledge of critical reaction intermediates, mechanisms, and kinetics. As we move beyond the covalent synthetic regime, into the domain of non-covalent interactions occupied by self-assembly, harnessing and embracing complexity is a must, and non-targeted analyses of dynamic systems are becoming increasingly important. Coordination driven self-assembly is an important subtype of self-assembly that presents several wicked analytical challenges. These challenges are “wicked” due the very complexity desired confounding the analysis of products, intermediates, and pathways, therefore limiting reaction optimisation, tuning, and ultimately, utility. Ion Mobility-Mass Spectrometry solves many of the most challenging analytical problems in separating and analysing the structure of both simple and complex species formed via coordination driven self-assembly. Thus, due to the emerging importance of ion mobility mass spectrometry as an analytical technique tackling complex systems, this review highlights exciting recent applications. These include equilibrium monitoring, structural and dynamic analysis of previously analytically inaccessible complex interlinked structures and the process of self-sorting. The vast and largely untapped potential of ion mobility mass spectrometry to coordination driven self-assembly is yet to be fully realised. Therefore, we also propose where current analytical approaches can be built upon to allow for greater insight into the complexity and structural dynamics involved in self-assembly.

Direct Synthesis and Self-Assembly of Silicon Nanowires

2004 ◽  
Author(s):  
Ongi Englander ◽  
Dane Christensen ◽  
Jongbaeg Kim ◽  
Liwei Lin
Keyword(s):  
Silicon Nanowires ◽  
Self Assembly ◽  
Direct Synthesis ◽  
Integrated System ◽  
Synthesis Process ◽  
Synthesis Mechanism ◽  
Mechanical And Electrical Properties ◽  
Sensing Applications ◽  
Nanowire Synthesis

The direct synthesis and self-assembly of silicon nanowires to yield a two-terminal, nano-to-micro integrated system has been demonstrated. The process takes advantage of localized heating to initiate and sustain a bottom up nanowire synthesis mechanism. As soon as the nanowire synthesis process is complete, the integrated system is ready for characterization of mechanical and electrical properties as well as functionalization for sensing applications. The process is CMOS compatible and eliminates the nano-to-micro contact formation process that is currently required of traditional processes.

scholarly journals Functionalized Particles Designed for Targeted Delivery

Polymers ◽  
2021 ◽  
Vol 13 (12) ◽  
pp. 2022
Author(s):  
Teresa Basinska ◽  
Mariusz Gadzinowski ◽  
Damian Mickiewicz ◽  
Stanislaw Slomkowski
Keyword(s):  
Functional Groups ◽  
Self Assembly ◽  
Targeted Delivery ◽  
Direct Synthesis ◽  
Drug Carriers ◽  
Cell Types ◽  
Bioactive Substances ◽  
Particle Preparation ◽  
Specific Receptors ◽  
Micrometer Size

Pure bioactive compounds alone can only be exceptionally administered in medical treatment. Usually, drugs are produced as various forms of active compounds and auxiliary substances, combinations assuring the desired healing functions. One of the important drug forms is represented by a combination of active substances and particle-shaped polymer in the nano- or micrometer size range. The review describes recent progress in this field balanced with basic information. After a brief introduction, the paper presents a concise overview of polymers used as components of nano- and microparticle drug carriers. Thereafter, progress in direct synthesis of polymer particles with functional groups is discussed. A section is devoted to formation of particles by self-assembly of homo- and copolymer-bearing functional groups. Special attention is focused on modification of the primary functional groups introduced during particle preparation, including introduction of ligands promoting anchorage of particles onto the chosen living cell types by interactions with specific receptors present in cell membranes. Particular attention is focused on progress in methods suitable for preparation of particles loaded with bioactive substances. The review ends with a brief discussion of the still not answered questions and unsolved problems.

scholarly journals DIRECT SYNTHESIS AND CRYSTAL STRUCTURE OF BIS(BROMIDO-BIS(1,10 PHENANTHROLINE)-COPPER(II)) NITROPRUSSIDE DIMETHYLFORMAMIDE SOLVATE

2018 ◽  
pp. 15-18
Author(s):  
O. Vassilyeva ◽  
E. Buvaylo ◽  
B. Skelton
Keyword(s):  
Crystal Structure ◽  
Self Assembly ◽  
Direct Synthesis ◽  
Solvent Molecule ◽  
The Self ◽  
Coordination Geometry ◽  
Synthesis And Crystal Structure ◽  
Copper Coordination ◽  
Bromide Ion ◽  
Nitroprusside Anion

The title compound, [Cu(C12H8N2)2Br]2[Fe(CN)5(NO)]·C3H7NO, was prepared by the self-assembly of nitroprusside anion and Cu cation containing a bidentate amine in the reaction of copper powder and sodium nitroprusside with NH4Br and 1,10-phenanthroline (phen) in dimethylformamide (DMF). The complex is formed of discrete [Cu(phen)2Br]+ cations, nitroprusside [Fe(CN)5(NO)]2– anions and DMF molecules of crystallization. The cation has no crystallographically imposed symmetry; the metal atom coordinates two nitrogen atoms of two phen molecules and bromide ion. The copper coordination geometry is intermediate between a square pyramid and a trigonal bipyramid. The [Fe(CN)5(NO)]2– anion is located on an inversion centre with the nitrosyl group modelled as disordered with one of the CN groups. The DMF solvent molecule was found to be disordered about the crystallographic inversion centre; geometries were restrained to ideal values. In the solid state, alternating layers of cations and of anions plus DMF molecules are stacked along the b axis.

scholarly journals Electrospinning Processing Techniques for the Manufacturing of Composite Dielectric Elastomer Fibers

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6288
Author(s):  
Mirella Ramirez ◽  
Louis Vaught ◽  
Chiu Law ◽  
Jacob L. Meyer ◽  
Rani Elhajjar
Keyword(s):  
Self Assembly ◽  
Direct Synthesis ◽  
Polymer Concentration ◽  
Artificial Muscle ◽  
Dielectric Elastomer ◽  
Solution Viscosity ◽  
Viscous Polymer ◽  
Processing Techniques ◽  
The Impact ◽  
Protective Textiles

Dielectric elastomers (DE) are novel composite architectures capable of large actuation strains and the ability to be formed into a variety of actuator configurations. However, the high voltage requirement of DE actuators limits their applications for a variety of applications. Fiber actuators composed of DE fibers are particularly attractive as they can be formed into artificial muscle architectures. The interest in manufacturing micro or nanoscale DE fibers is increasing due to the possible applications in tissue engineering, filtration, drug delivery, catalysis, protective textiles, and sensors. Drawing, self-assembly, template-direct synthesis, and electrospinning processing have been explored to manufacture these fibers. Electrospinning has been proposed because of its ability to produce sub-mm diameter size fibers. In this paper, we investigate the impact of electrospinning parameters on the production of composite dielectric elastomer fibers. In an electrospinning setup, an electrostatic field is applied to a viscous polymer solution at an electrode’s tip. The polymer composite with carbon black and carbon nanotubes is expelled and accelerated towards a collector. Factors that are considered in this study include polymer concentration, solution viscosity, flow rate, electric field intensity, and the distance to the collector.

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