Self-assembled gold nanofilms as a simple, recoverable and recyclable catalyst for nitro-reduction

2015 ◽  
Vol 3 (42) ◽  
pp. 21167-21177 ◽  
Author(s):  
Manikkavalli Mohan ◽  
Nagaboopathy Mohan ◽  
Dillip Kumar Chand
Keyword(s):  
Self Assembly ◽  
Recyclable Catalyst ◽  
Liquid Interfaces ◽  
Ambient Conditions ◽  
Reduction Reactions ◽  
Self Assembled ◽  
Nitro Reduction

A facile method to prepare gold nanofilms (AuNFs), from hexaazamacrocycle (L) stabilized AuNPs, by self-assembly at liquid/liquid interfaces is developed. A vial coated with AuNFs was used as a recoverable and reusable catalytic reservoir for nitro-reduction reactions in water under ambient conditions.

Construction of solvent-dependent self-assembled porous Ni(ii)-coordinated frameworks as effective catalysts for chemical transformation of CO2

RSC Advances ◽  
2016 ◽  
Vol 6 (109) ◽  
pp. 108010-108016 ◽  
Author(s):  
Zhen Zhou ◽  
Lu Yang ◽  
Yefei Wang ◽  
Cheng He ◽  
Tao Liu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Chemical Transformation ◽  
Self Assembly ◽  
Ambient Conditions ◽  
Heterogeneous Catalytic ◽  
Self Assembled

Two types of Ni(ii)-based coordinated frameworks have been solvothermally synthesized via solvent driven self-assembly, showing efficient heterogeneous catalytic activity toward cycloaddition of CO2 with epoxides under ambient conditions.

Investigating reaction conditions for controlling the self-assembly of metal-seamed pyrogallol[4]arene nanocapsules

2019 ◽  
Author(s):  
◽  
Asanka Sajeewani Rathnayake
Keyword(s):  
Metal Ions ◽  
Self Assembly ◽  
Mixed Valence ◽  
Transition Metal Ions ◽  
Ambient Conditions ◽  
Reaction Conditions ◽  
University Of Missouri ◽  
Reduction Reactions ◽  
Oxidation Reduction ◽  
The University

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Upon coordination to metal ions, C-alkylpyrogallol[4]arenes (PgCn, where n is the number of carbon atoms in the pendant alkyl chains), can be assembled into spherical metal-organic nanocapsules (MONCs). MONCs are generally arranged into two different structural types, hexamers and dimers, of which six or two PgCn units assemble into capsular structures by coordination to 24 or 8 metal ions, respectively. Co[II]-, Zn[II]-, and Mn[II]-coordinated MONCs have been synthesized under ambient conditions and structurally characterized. Under certain reaction conditions, some transition metal ions and other reagents seem to act as electron accepting or donating reagents, such that appropriate oxidation or reduction reactions may occur. These types of in-situ redox reactions lead to the formation of mixed-valence Mn[II]/Mn[III]- and Fe[II]/Fe[III]-seamed MONCs. The occurrence of such oxidation/reduction reactions appears to be promoted by certain factors such as resulting pH conditions, size of the coordinating ions/ligands, and oxidizing/reducing abilities of reagents used in each synthesis. In addition, studies have been carried out to incorporate some defects into the MONC outer framework by using mixed-macrocycles as the starting materials. Mixed-macrocycles are synthesized by fusing both resorcinol and pyrogallol into the same macrocycle, and the position of resorcinol units in the MONC usually appears as a hole or defect on the capsule surface. Incorporations of such defects give MONCs potential for, for example, selective filtering of small molecules into the capsule interior and magnetic and electronic applications by varying the electrostatic interaction between adjacent metal ions.

scholarly journals Self-assembly of small molecules at hydrophobic interfaces using group effect

Nanoscale ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 5452-5463 ◽  
Author(s):  
William Foster ◽  
Keisuke Miyazawa ◽  
Takeshi Fukuma ◽  
Halim Kusumaatmaja ◽  
Kislon Voϊtchovsky
Keyword(s):  
Small Molecules ◽  
Self Assembly ◽  
Liquid Interfaces ◽  
Group Effect ◽  
Self Assembled ◽  
Solid Liquid

Group effect allows non-tethered small molecules to form a wide variety of self-assembled structures at solid–liquid interfaces.

Nanoscale Self-Assembly Using Ion and Electron Beam Techniques: A Rapid Review

MRS Advances ◽  
2020 ◽  
Vol 5 (64) ◽  
pp. 3507-3520
Author(s):  
Chunhui Dai ◽  
Kriti Agarwal ◽  
Jeong-Hyun Cho
Keyword(s):  
Electron Beam ◽  
Self Assembly ◽  
Ion Beam ◽  
Three Dimensional ◽  
The Self ◽  
Stress Generation ◽  
Rapid Review ◽  
High Yield ◽  
3D Nanostructures ◽  
Self Assembled

AbstractNanoscale self-assembly, as a technique to transform two-dimensional (2D) planar patterns into three-dimensional (3D) nanoscale architectures, has achieved tremendous success in the past decade. However, an assembly process at nanoscale is easily affected by small unavoidable variations in sample conditions and reaction environment, resulting in a low yield. Recently, in-situ monitored self-assembly based on ion and electron irradiation has stood out as a promising candidate to overcome this limitation. The usage of ion and electron beam allows stress generation and real-time observation simultaneously, which significantly enhances the controllability of self-assembly. This enables the realization of various complex 3D nanostructures with a high yield. The additional dimension of the self-assembled 3D nanostructures opens the possibility to explore novel properties that cannot be demonstrated in 2D planar patterns. Here, we present a rapid review on the recent achievements and challenges in nanoscale self-assembly using electron and ion beam techniques, followed by a discussion of the novel optical properties achieved in the self-assembled 3D nanostructures.

Self-Assembly of a Chiral Cubic Three-Connected Net from the High Symmetry Molecules C60 and SnI4

2020 ◽  
Author(s):  
Daniel B. Straus ◽  
Robert J. Cava
Keyword(s):  
Organic Synthesis ◽  
Self Assembly ◽  
Van Der Waals ◽  
Van Der Waals Forces ◽  
High Symmetry ◽  
Molecular Chirality ◽  
Chiral Materials ◽  
Self Assembled ◽  
Chiral Centers

The design of new chiral materials usually requires stereoselective organic synthesis to create molecules with chiral centers. Less commonly, achiral molecules can self-assemble into chiral materials, despite the absence of intrinsic molecular chirality. Here, we demonstrate the assembly of high-symmetry molecules into a chiral van der Waals structure by synthesizing crystals of C<sub>60</sub>(SnI<sub>4</sub>)<sub>2</sub> from icosahedral buckminsterfullerene (C<sub>60</sub>) and tetrahedral SnI4 molecules through spontaneous self-assembly. The SnI<sub>4</sub> tetrahedra template the Sn atoms into a chiral cubic three-connected net of the SrSi<sub>2</sub> type that is held together by van der Waals forces. Our results represent the remarkable emergence of a self-assembled chiral material from two of the most highly symmetric molecules, demonstrating that almost any molecular, nanocrystalline, or engineered precursor can be considered when designing chiral assemblies.

scholarly journals Nano- and Micropatterning on Optical Fibers by Bottom-Up Approach: The Importance of Being Ordered

2021 ◽  
Vol 11 (7) ◽  
pp. 3254
Author(s):  
Marco Pisco ◽  
Francesco Galeotti
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Self Assembly ◽  
Ordered Structures ◽  
Bottom Up ◽  
Photonic Structures ◽  
Fiber Technology ◽  
Optical Fiber Probes ◽  
Fiber Probes ◽  
Self Assembled

The realization of advanced optical fiber probes demands the integration of materials and structures on optical fibers with micro- and nanoscale definition. Although researchers often choose complex nanofabrication tools to implement their designs, the migration from proof-of-principle devices to mass production lab-on-fiber devices requires the development of sustainable and reliable technology for cost-effective production. To make it possible, continuous efforts are devoted to applying bottom-up nanofabrication based on self-assembly to decorate the optical fiber with highly ordered photonic structures. The main challenges still pertain to “order” attainment and the limited number of implementable geometries. In this review, we try to shed light on the importance of self-assembled ordered patterns for lab-on-fiber technology. After a brief presentation of the light manipulation possibilities concerned with ordered structures, and of the new prospects offered by aperiodically ordered structures, we briefly recall how the bottom-up approach can be applied to create ordered patterns on the optical fiber. Then, we present un-attempted methodologies, which can enlarge the set of achievable structures, and can potentially improve the yielding rate in finely ordered self-assembled optical fiber probes by eliminating undesired defects and increasing the order by post-processing treatments. Finally, we discuss the available tools to quantify the degree of order in the obtained photonic structures, by suggesting the use of key performance figures of merit in order to systematically evaluate to what extent the pattern is really “ordered”. We hope such a collection of articles and discussion herein could inspire new directions and hint at best practices to fully exploit the benefits inherent to self-organization phenomena leading to ordered systems.

scholarly journals Self-assembled interpenetrating networks by orthogonal self assembly of surfactants and hydrogelators

2009 ◽  
Vol 143 ◽  
pp. 345 ◽  
Author(s):  
Aurelie M. Brizard ◽  
Marc C. A. Stuart ◽  
Jan H. van Esch
Keyword(s):  
Self Assembly ◽  
Interpenetrating Networks ◽  
Self Assembled

scholarly journals Self-Assembly of Shape-Tunable Oblate Colloidal Particles into Orientationally Ordered Crystals, Glassy Crystals and Plastic Crystals

Soft Matter ◽  
2021 ◽  
Author(s):  
Jiawei Lu ◽  
Xiangyu Bu ◽  
Xinghua Zhang ◽  
Bing Liu
Keyword(s):  
Crystal Structures ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Building Blocks ◽  
Fundamental Question ◽  
The Self ◽  
Plastic Crystals ◽  
Self Assembled ◽  
Glassy Crystals ◽  
The Relationship

The shapes of colloidal particles are crucial to the self-assembled superstructures. Understanding the relationship between the shapes of building blocks and the resulting crystal structures is an important fundamental question....

Self-assembled luminescent cholate gels induced by a europium ion in deep eutectic solvents

Soft Matter ◽  
2021 ◽  
Author(s):  
Meng Sun ◽  
Qintang Li ◽  
Xiao Chen
Keyword(s):  
Self Assembly ◽  
Choline Chloride ◽  
Deep Eutectic Solvents ◽  
Sodium Cholate ◽  
The Self ◽  
Europium Ion ◽  
Self Assembled

Luminescent gels have been successfully fabricated through the self-assembly of sodium cholate and a europium ion in choline chloride-based deep eutectic solvents.

scholarly journals Constructing Large 2D Lattices Out of DNA-Tiles

Molecules ◽  
2021 ◽  
Vol 26 (6) ◽  
pp. 1502
Author(s):  
Johannes M. Parikka ◽  
Karolina Sokołowska ◽  
Nemanja Markešević ◽  
J. Jussi Toppari
Keyword(s):  
Self Assembly ◽  
Dna Nanotechnology ◽  
Building Blocks ◽  
High Yield ◽  
Dna Nanostructures ◽  
Liquid Interfaces ◽  
Basic Principles ◽  
Dna Tiles ◽  
One Step ◽  
Solid Liquid

The predictable nature of deoxyribonucleic acid (DNA) interactions enables assembly of DNA into almost any arbitrary shape with programmable features of nanometer precision. The recent progress of DNA nanotechnology has allowed production of an even wider gamut of possible shapes with high-yield and error-free assembly processes. Most of these structures are, however, limited in size to a nanometer scale. To overcome this limitation, a plethora of studies has been carried out to form larger structures using DNA assemblies as building blocks or tiles. Therefore, DNA tiles have become one of the most widely used building blocks for engineering large, intricate structures with nanometer precision. To create even larger assemblies with highly organized patterns, scientists have developed a variety of structural design principles and assembly methods. This review first summarizes currently available DNA tile toolboxes and the basic principles of lattice formation and hierarchical self-assembly using DNA tiles. Special emphasis is given to the forces involved in the assembly process in liquid-liquid and at solid-liquid interfaces, and how to master them to reach the optimum balance between the involved interactions for successful self-assembly. In addition, we focus on the recent approaches that have shown great potential for the controlled immobilization and positioning of DNA nanostructures on different surfaces. The ability to position DNA objects in a controllable manner on technologically relevant surfaces is one step forward towards the integration of DNA-based materials into nanoelectronic and sensor devices.

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