Controlled formation of nanoparticle clusters mediated by electrostatic interaction

RSC Advances ◽  
2014 ◽  
Vol 4 (81) ◽  
pp. 43105-43109 ◽  
Author(s):  
Xiaoshuang Shen ◽  
Chao Mei ◽  
Yuxue Zhou ◽  
Weiwei Xia ◽  
Min Zhou ◽  
...  
Keyword(s):  
Electrostatic Interaction ◽  
Self Assembly ◽  
High Yield ◽  
General Strategy ◽  
Assembly Process ◽  
Nanoparticle Clusters

A general strategy for high yield fabrication of homo- and hetero-nanoparticle clusters with controlled configuration and inter-particle gap through a self-assembly process mediated by electrostatic interaction was reported.

Constructing multifunctional MOF@rGO hydro-/aerogels by the self-assembly process for customized water remediation

2017 ◽  
Vol 5 (23) ◽  
pp. 11873-11881 ◽  
Author(s):  
Jiajun Mao ◽  
Mingzheng Ge ◽  
Jianying Huang ◽  
Yuekun Lai ◽  
Changjian Lin ◽  
...  
Keyword(s):  
Self Assembly ◽  
Synergistic Effects ◽  
Chemical Reduction ◽  
The Self ◽  
Water Remediation ◽  
Cross Linking ◽  
General Strategy ◽  
Assembly Process ◽  
One Step ◽  
First Time

We first time report a general strategy for one-step fabrication of a ZIF-8 MOF/RGO hydrogel, with the synergistic effects of chemical reduction and cross-linking by metal ions.

Nanotemplate-Guided Self-Assembly of Gold Nanoparticles and its Application to Plasmonic Bio/Chemical Sensing

2018 ◽  
Vol 12 (1) ◽  
pp. 79-86 ◽  
Author(s):  
Koji Sugano ◽  
Keyword(s):  
Gold Nanoparticles ◽  
Single Molecule ◽  
Electrostatic Interaction ◽  
Self Assembly ◽  
Particle Concentration ◽  
Limit Of Detection ◽  
Incident Light ◽  
Surface Enhanced Raman Spectroscopy ◽  
High Yield ◽  
Polarization Angle

This paper presents a high-precision and high-yield nanotemplate-guided self-assembly process for spherical gold nanoparticles. This process enables us to arrange particles in designated patterns on a substrate with nanotemplates. These particles are trapped on the nanotemplate by liquid-air interfacial force during drying of the colloidal solution. In this method, particle concentration and electrostatic interaction between particles have a considerable effect on the assembly yield. The particle concentration should be optimized based on the template pattern. A nanogap-controlled particle arrangement with a high yield is achieved by controlling the electrostatic interaction, which is accomplished by adding an electrolyte. This technique enables control of the plasmonic resonance properties of metal nanoparticles on substrates for many emerging applications. Among them, this paper discusses the application of nanotemplate-guided self-assembly to an ultrasensitive nanostructure for surface-enhanced Raman spectroscopy. The gold nanoparticle dimer, which has been reported as the highest Raman enhancing structure, is directionally arrayed on a substrate. The highest enhancement can be achieved when the direction of a particle connection for a dimer is matched to the polarization direction of incident light. A considerable enhancement can be achieved at all dimers. The fabricated structures are evaluated by focusing on the polarization angle. The 10-11-M limit of detection and a 0.05-s rapid detection are achieved by using 4,4-bipyridine molecules with single-molecule sensitivity.

Amino-functionalized MOF derived porous Fe3O4/N-doped C encapsulated within a graphene network by self-assembling for enhanced Li-ion storage

2020 ◽  
Vol 4 (7) ◽  
pp. 3519-3527
Author(s):  
Weijuan Wang ◽  
Daming Chen ◽  
Hui Xu ◽  
Genxi Yu ◽  
Shangqi Sun ◽  
...  
Keyword(s):  
Electrochemical Performance ◽  
Electrostatic Interaction ◽  
Self Assembly ◽  
Assembly Process ◽  
Self Assembling ◽  
Excellent Electrochemical Performance ◽  
Ion Storage ◽  
Li Ion

A graphene-wrapped porous Fe3O4/N-doped C composite was synthesized by an electrostatic interaction induced self-assembly process, showing an excellent electrochemical performance.

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.

Preparation of BSA Nanoparticles by Desolvation Technique Using Acetone as Desolvating Agent

2012 ◽  
Vol 5 (1) ◽  
pp. 1643-1647
Author(s):  
Krishna Sailaja A ◽  
Amareshwar P
Keyword(s):  
Aqueous Solution ◽  
Standard Deviation ◽  
Process Parameters ◽  
Self Assembly ◽  
Size Control ◽  
Polymeric Materials ◽  
Preparation Condition ◽  
Assembly Process ◽  
Average Size

In order to see the functionality and toxicity of nanoparticles in various food and drug applications, it is important to establish procedures to prepare nanoparticles of a controlled size. Desolvation is a thermodynamically driven self-assembly process for polymeric materials. In this study, we prepared BSA nanoparticles using the desolvation technique using acetone as desolvating agent. Acetone was added intermittently into 1% BSA solution at different pH under stirring at 700 rpm. Amount of acetone added, intermittent timeline of acetone addition, and pH of solution were considered as process parameters to be optimized. The effect of the process parameters on size of the nanoparticles was studied. The results indicated that the size control of BSA nanoparticles was achieved by adding acetone intermittently. The standard deviation of average size of BSA nanoparticles at each preparation condition was minimized by adding acetone intermittently. The intermittent addition in polymeric aqueous solution can be useful for size control for food or drug applications.  

scholarly journals Interfacial Crystallization and Supramolecular Self-Assembly of Spider Silk Inspired Protein at the Water-Air Interface

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4239
Author(s):  
Pezhman Mohammadi ◽  
Fabian Zemke ◽  
Wolfgang Wagermaier ◽  
Markus B. Linder
Keyword(s):  
Self Assembly ◽  
Spider Silk ◽  
Assembly Process ◽  
Protein Solution ◽  
Time Resolved ◽  
Macromolecular Assembly ◽  
X Ray Scattering ◽  
Air Interface ◽  
Fundamental Research ◽  
Β Sheet

Macromolecular assembly into complex morphologies and architectural shapes is an area of fundamental research and technological innovation. In this work, we investigate the self-assembly process of recombinantly produced protein inspired by spider silk (spidroin). To elucidate the first steps of the assembly process, we examined highly concentrated and viscous pendant droplets of this protein in air. We show how the protein self-assembles and crystallizes at the water–air interface into a relatively thick and highly elastic skin. Using time-resolved in situ synchrotron X-ray scattering measurements during the drying process, we showed that the skin evolved to contain a high β-sheet amount over time. We also found that β-sheet formation strongly depended on protein concentration and relative humidity. These had a strong influence not only on the amount, but also on the ordering of these structures during the β-sheet formation process. We also showed how the skin around pendant droplets can serve as a reservoir for attaining liquid–liquid phase separation and coacervation from the dilute protein solution. Essentially, this study shows a new assembly route which could be optimized for the synthesis of new materials from a dilute protein solution and determine the properties of the final products.

scholarly journals Self-Assembled Nanomaterials Based on Complementary Sn(IV) and Zn(II)-Porphyrins, and Their Photocatalytic Degradation for Rhodamine B Dye

Molecules ◽  
2021 ◽  
Vol 26 (12) ◽  
pp. 3598
Author(s):  
Nirmal K. Shee ◽  
Hee-Joon Kim
Keyword(s):  
Aqueous Solution ◽  
Visible Light Irradiation ◽  
Rhodamine B ◽  
Self Assembly ◽  
The Self ◽  
Assembly Process ◽  
Absorption Bands ◽  
Ligand Coordination ◽  
Rhodamine B Dye ◽  
Metal Ligand

A series of porphyrin triads (1–6), based on the reaction of trans-dihydroxo-[5,15-bis(3-pyridyl)-10,20-bis(phenyl)porphyrinato]tin(IV) (SnP) with six different phenoxy Zn(II)-porphyrins (ZnLn), was synthesized. The cooperative metal–ligand coordination of 3-pyridyl nitrogens in the SnP with the phenoxy Zn(II)-porphyrins, followed by the self-assembly process, leads to the formation of nanostructures. The red-shifts and remarkable broadening of the absorption bands in the UV–vis spectra for the triads in CHCl3 indicate that nanoaggregates may be produced in the self-assembly process of these triads. The emission intensities of the triads were also significantly reduced due to the aggregation. Microscopic analyses of the nanostructures of the triads reveal differences due to the different substituents on the axial Zn(II)-porphyrin moieties. All these nanomaterials exhibited efficient photocatalytic performances in the degradation of rhodamine B (RhB) dye under visible light irradiation, and the degradation efficiencies of RhB in aqueous solution were observed to be 72~95% within 4 h. In addition, the efficiency of the catalyst was not impaired, showing excellent recyclability even after being applied for the degradation of RhB in up to five cycles.

scholarly journals Metal Oxide-Related Dendritic Structures: Self-Assembly and Applications for Sensor, Catalysis, Energy Conversion and Beyond

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1686
Author(s):  
Ruohong Sui ◽  
Paul A. Charpentier ◽  
Robert A. Marriott
Keyword(s):  
Metal Oxide ◽  
Energy Conversion ◽  
Self Assembly ◽  
Hierarchical Structures ◽  
The Self ◽  
Assembly Process ◽  
Electronic Noses ◽  
Dendritic Nanostructures ◽  
Energy Conversion And Storage ◽  
The Aesthetic

In the past two decades, we have learned a great deal about self-assembly of dendritic metal oxide structures, partially inspired by the nanostructures mimicking the aesthetic hierarchical structures of ferns and corals. The self-assembly process involves either anisotropic polycondensation or molecular recognition mechanisms. The major driving force for research in this field is due to the wide variety of applications in addition to the unique structures and properties of these dendritic nanostructures. Our purpose of this minireview is twofold: (1) to showcase what we have learned so far about how the self-assembly process occurs; and (2) to encourage people to use this type of material for drug delivery, renewable energy conversion and storage, biomaterials, and electronic noses.

Assembly effect on the charge carrier mobility in quaterthiophene-based n/p-materials

2019 ◽  
Vol 7 (22) ◽  
pp. 6649-6655
Author(s):  
A. López-Andarias ◽  
C. Atienza ◽  
J. López-Andarias ◽  
W. Matsuda ◽  
T. Sakurai ◽  
...  
Keyword(s):  
Charge Carrier ◽  
Self Assembly ◽  
Carrier Mobility ◽  
Charge Carrier Mobility ◽  
Assembly Process ◽  
Charge Mobility

Effect of the peptide-based quaterthiophene self-assembly process on the charge mobility properties of the n/p-materials formed is studied.

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