Research on the self-assembly of exfoliated perovskite nanosheets (LaNb2O7−) and cobalt porphyrin utilized for the electrocatalytic oxidation of ascorbic acid

RSC Advances ◽  
2016 ◽  
Vol 6 (52) ◽  
pp. 46388-46393 ◽  
Author(s):  
Binbin Pan ◽  
Wenlei Zhao ◽  
Xiaobo Zhang ◽  
Jinpeng Li ◽  
Jiasheng Xu ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
Electrocatalytic Oxidation ◽  
Hybrid Film ◽  
The Self ◽  
Cobalt Porphyrin

A sandwich-structured nanocomposite of LaNb2O7/CoTMPyP was fabricated via electrostatic interactions between LaNb2O7− nanosheets and cobalt porphyrin cations, and the obtained hybrid film exhibited excellent electrocatalytic activities toward AA.

Controllable Synthesis of Cobalt Porphyrin Nanocrystals through Micelle Confinement Self-Assembly

MRS Advances ◽  
2020 ◽  
Vol 5 (42) ◽  
pp. 2147-2155
Author(s):  
Sudi Chen ◽  
Xitong Ren ◽  
Shufang Tian ◽  
Jiajie Sun ◽  
Feng Bai
Keyword(s):  
Self Assembly ◽  
Water Oxidation ◽  
Separation Efficiency ◽  
Noncovalent Interactions ◽  
Building Blocks ◽  
The Self ◽  
Hexagonal Prism ◽  
Assembly Process ◽  
Surfactant Micelles ◽  
Cobalt Porphyrin

AbstractThe self-assembly of optically active building blocks into functional nanocrystals as high-activity photocatalysts is a key in the field of photocatalysis. Cobalt porphyrin with abundant catalytic properties is extensively studied in photocatalytic water oxidation and CO2 reduction. Here, we present the fabrication of cobalt porphyrin nanocrystals through a surfactant-assisted interfacial self-assembly process using Co-tetra(4-pyridyl) porphyrin as building block. The self-assembly process relies on the combined noncovalent interactions such as π-π stacking and axial Co-N coordination between individual porphyrin molecules within surfactant micelles. Tuning different reaction conditions (temperature, the ratio of co-solvent DMF) and types of surfactant, various nanocrystals with well-defined 1D to 3D morphologies such as nanowires, nanorods and nano hexagonal prism were obtained. Due to the ordered accumulation of molecules, the nanocrystals exhibit the properties of the enhanced capability of visible light capture and can conduce to improve the transport and separation efficiency of the photogenerated carriers, which is important for photocatalysis. Further studies of photocatalytic CO2 reduction are being performed to address the relationship between the size and shape of the nanocrystals with the photocatalytic activity.

scholarly journals Controlling the Self-Assembly of Biomolecules into Functional Nanomaterials through Internal Interactions and External Stimulations: A Review

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 285 ◽  
Author(s):  
Li Wang ◽  
Coucong Gong ◽  
Xinzhu Yuan ◽  
Gang Wei
Keyword(s):  
Self Assembly ◽  
Electrostatic Interactions ◽  
Materials Science ◽  
Hydrophobic Interactions ◽  
The Self ◽  
Functional Nanomaterials ◽  
Light Stimulation ◽  
Dna Base ◽  
Wide Range ◽  
Structure And Functions

Biomolecular self-assembly provides a facile way to synthesize functional nanomaterials. Due to the unique structure and functions of biomolecules, the created biological nanomaterials via biomolecular self-assembly have a wide range of applications, from materials science to biomedical engineering, tissue engineering, nanotechnology, and analytical science. In this review, we present recent advances in the synthesis of biological nanomaterials by controlling the biomolecular self-assembly from adjusting internal interactions and external stimulations. The self-assembly mechanisms of biomolecules (DNA, protein, peptide, virus, enzyme, metabolites, lipid, cholesterol, and others) related to various internal interactions, including hydrogen bonds, electrostatic interactions, hydrophobic interactions, π–π stacking, DNA base pairing, and ligand–receptor binding, are discussed by analyzing some recent studies. In addition, some strategies for promoting biomolecular self-assembly via external stimulations, such as adjusting the solution conditions (pH, temperature, ionic strength), adding organics, nanoparticles, or enzymes, and applying external light stimulation to the self-assembly systems, are demonstrated. We hope that this overview will be helpful for readers to understand the self-assembly mechanisms and strategies of biomolecules and to design and develop new biological nanostructures or nanomaterials for desired applications.

scholarly journals Unveiling the Key Templates in the Self-Assembly of Gigantic Molybdenum Blue Wheels

2018 ◽  
Author(s):  
Weimin Xuan ◽  
Robert Pow ◽  
Qi Zheng, ◽  
Nancy Watfa ◽  
De-Liang Long ◽  
...  
Keyword(s):  
Self Assembly ◽  
Electrostatic Interactions ◽  
Structural Evolution ◽  
Functional Materials ◽  
Building Blocks ◽  
Underlying Mechanism ◽  
The Self ◽  
Supramolecular Systems ◽  
Structure Directing Agent ◽  
Molybdenum Blue

Template synthesis is a powerful and useful approach to build a variety of functional materials and complicated supramolecular systems. Systematic study on how templates structurally evolve from basic building blocks and then affect the templated self-assembly is critical to understand the underlying mechanism and gain more guidance for designed assembly but remains challenging. Here we describe the templated self-assembly of a series of gigantic Mo Blue (MB) clusters 1-4 using L-ornithine as structure-directing agent. L-ornithine is essential for the formation of such kind of template⊂host assemblies by providing directional forces of hydrogen bonding and electrostatic interactions. Based on the structural relationship between encapsulated templates of {Mo8} (1), {Mo17} (2) and {Mo36} (4), a plausible pathway of the structural evolution of templates is proposed, thus giving more insight on the templated self-assembly of Mo Blue clusters.

Impact of Electrostatic Interactions on the Self-Assembly of Charge-Neutral Block Copolyelectrolytes

2020 ◽  
Vol 53 (2) ◽  
pp. 548-557
Author(s):  
Sebastian T. Russell ◽  
Ramya Raghunathan ◽  
Andrew M. Jimenez ◽  
Kai Zhang ◽  
Spencer D. Brucks ◽  
...  
Keyword(s):  
Self Assembly ◽  
Electrostatic Interactions ◽  
The Self

Porphyrin self-assembly as template for RNA?

2001 ◽  
Vol 05 (09) ◽  
pp. 691-701 ◽  
Author(s):  
GERLINDE BISCHOFF ◽  
ROBERT BISCHOFF ◽  
SIEGFRIED HOFFMANN
Keyword(s):  
Self Assembly ◽  
Electrostatic Interactions ◽  
Room Temperature ◽  
Helical Structure ◽  
Scanning Force Microscopy ◽  
The Self ◽  
Scanning Calorimetry ◽  
Low Salt ◽  
Aqueous Conditions ◽  
Increasing Temperature

The self-assembly of chiral porphyrin molecules HpD (hematoporphyrin IX derivative) has been shown to form helical fibers in low salt aqueous conditions. The spectroscopic (UV and circular dichroism (CD)), thermodynamic (Tm, differential scanning calorimetry (DSC)) and microscopic (light and scanning force microscopy (SFM)) examinations of the HpD properties were performed individually and in the presence of nucleic acid double strands (15–60 °C, 0–50 mM NaCl ). The asymmetric HpD molecules themselves at room temperature show sharp positive or negative CD signals, which increase enormously with HpD concentration. The data show strong evidence for the external self-stacking interaction of HpD , pure and in the presence of polynucleotides. At low salt concentration (<40 mM NaCl , pH 7) the spectra change completely by increasing the temperature. At 35 to 40 °C RNA-similar spectra of the pure HpD self-assemblies (without nucleic acids) occur. At higher temperatures the aggregates become unstable and break off. At room temperature the helical structure of the fibers could be visualized by SFM investigations. Molecular modeling analysis offers dynamic arrangements of the self-assemblies from stacks to spiral-like superstructures with increasing temperature. Hydrogen bonding, electron transferring and electrostatic interactions determine the shape of the proposed highly flexible arrangements. Moreover, the interrelation between the HpD stacks and the helix of the polynucleotides was studied. The calculated low transition energies indicate the importance of these structures as a crossing link. All data are discussed in favor of a hypothetical evolutionary matrix role in porphyrin self-assembly for RNA.

scholarly journals Potential Driven Non-Reactive Phase Transitions of Ordered Porphyrin Molecules on Iodine-Modified Au(100): An Electrochemical Scanning Tunneling Microscopy (EC-STM) Study

Surfaces ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 12-28 ◽  
Author(s):  
Tomasz Kosmala ◽  
Matías Blanco ◽  
Gaetano Granozzi ◽  
Klaus Wandelt
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Long Range ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
The Self ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Electrode Potentials ◽  
Electrochemical Scanning Tunneling Microscopy

The modelling of long-range ordered nanostructures is still a major issue for the scientific community. In this work, the self-assembly of redox-active tetra(N-methyl-4-pyridyl)-porphyrin cations (H2TMPyP) on an iodine-modified Au(100) electrode surface has been studied by means of Cyclic Voltammetry (CV) and in-situ Electrochemical Scanning Tunneling Microscopy (EC-STM) with submolecular resolution. While the CV measurements enable conclusions about the charge state of the organic species, in particular, the potentio-dynamic in situ STM results provide new insights into the self-assembly phenomena at the solid-liquid interface. In this work, we concentrate on the regime of positive electrode potentials in which the adsorbed molecules are not reduced yet. In this potential regime, the spontaneous adsorption of the H2TMPyP molecules on the anion precovered surface yields the formation of up to five different potential-dependent long-range ordered porphyrin phases. Potentio-dynamic STM measurements, as a function of the applied electrode potential, show that the existing ordered phases are the result of a combination of van der Waals and electrostatic interactions.

Flow injection amperometric sensing of uric acid and ascorbic acid using the self-assembly of heterocyclic thiol on Au electrode

2011 ◽  
Vol 16 (1) ◽  
pp. 173-178 ◽  
Author(s):  
Ramendra Sundar Dey ◽  
Susmita Gupta ◽  
Rupankar Paira ◽  
Shen-Ming Chen ◽  
C. Retna Raj
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Flow Injection ◽  
Self Assembly ◽  
The Self ◽  
Au Electrode ◽  
Amperometric Sensing

scholarly journals Use of additives to regulate solute aggregation and direct conformational polymorph nucleation of pimelic acid

IUCrJ ◽  
2021 ◽  
Vol 8 (2) ◽  
pp. 161-167
Author(s):  
Peng Shi ◽  
Shijie Xu ◽  
Huaiyu Yang ◽  
Songgu Wu ◽  
Weiwei Tang ◽  
...  
Keyword(s):  
Self Assembly ◽  
Electrostatic Interactions ◽  
Molecular Electrostatic Potential ◽  
Carbon Chain ◽  
The Self ◽  
Carbon Chain Length ◽  
Resonance Spectroscopy ◽  
Pimelic Acid ◽  
Conformational Rearrangement ◽  
Maximum Value

Understanding the nucleation pathway and achieving regulation to produce the desired crystals are mutually beneficial. The authors previously proposed a nucleation pathway of conformational polymorphs in which solvation and solute self-assembly could affect the result of the conformational rearrangement and further nucleation outcomes. Based on this, herein α,ω-alkanedicarboxylic acids (DAn, where n represents the number of carbon atoms in the molecule, n = 2–6, 8–11) were designed as homologous additives to interfere with the self-assembly of pimelic acid (DA7) to further induce the form II compound, which differs from form I only in conformation. Interestingly, longer-chain additives (DA6–11) have a stronger form II-inducing ability than short-chain ones (DA2–4). In addition, an apparent gradient of the degree of interference with solute self-assembly, consistent with form II-inducing ability, was detected by infrared and nuclear magnetic resonance spectroscopy. The calculated molecular electrostatic potential charges also clearly indicate that additive–solute electrostatic interactions gradually increase with increasing carbon chain length of the additives, reaching a maximum value with DA6–11. This novel use of additives demonstrates a direct link between solute aggregation and conformational polymorph nucleation.

Sign in / Sign up

Export Citation Format

Share Document