Self-assembly of polystyrene nano particles into patterns of random-close-packed monolayers via chemically induced adsorption

2002 ◽  
Vol 4 (3) ◽  
pp. 496-506 ◽  
Author(s):  
M. Himmelhaus ◽  
H. Takei
Keyword(s):  
Self Assembly ◽  
Nano Particles ◽  
Chemically Induced ◽  
Induced Adsorption

Green synthesis of mixed metallic nanoparticles using room temperature self-assembly

2017 ◽  
Vol 13 (2) ◽  
pp. 4671-4677 ◽  
Author(s):  
A. M. Abdelghany ◽  
A.H. Oraby ◽  
Awatif A Hindi ◽  
Doaa M El-Nagar ◽  
Fathia S Alhakami
Keyword(s):  
Self Assembly ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Bimetallic Nanoparticles ◽  
Reduction Process ◽  
Nano Particles ◽  
Nano Structure ◽  
Small Shift ◽  
Molar Ratios ◽  
Vis Spectroscopy

Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.

Fiber Bragg grating filter using evaporated induced self assembly of silica nano particles

2014 ◽  
Author(s):  
Krister Hammarling ◽  
Renyung Zhang ◽  
Anatoliy Manuilskiy ◽  
Hans-Erik Nilsson
Keyword(s):  
Fiber Bragg Grating ◽  
Self Assembly ◽  
Nano Particles ◽  
Bragg Grating

Water dynamics and self-assembly of single-chain nanoparticles in concentrated solutions

Soft Matter ◽  
2020 ◽  
Vol 16 (42) ◽  
pp. 9738-9745
Author(s):  
Beatriz Robles-Hernández ◽  
Edurne González ◽  
José A. Pomposo ◽  
Juan Colmenero ◽  
Ángel Alegría
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Water Dynamics ◽  
Nano Particles ◽  
Random Copolymers ◽  
Core Shell ◽  
Dielectric Studies ◽  
Single Chain ◽  
Concentrated Solutions ◽  
Overlap Concentration

Dielectric studies on water dynamics in aqueous solutions of amphiphilic random copolymers confirm the self-assembly into globular like core–shell single-chain nano-particles (SCNPs) at concentrations well above the overlap concentration.

EFFECT OF NICKEL CONTENTS ON THE MICROSTRUCTURE OF MESOPOROUS NICKEL OXIDE/GADOLINIUM-DOPED CERIA

2013 ◽  
Vol 06 (06) ◽  
pp. 1350055 ◽  
Author(s):  
SEUNGHYUN AHN ◽  
HYUN KOO ◽  
SUNG-HWAN BAE ◽  
CHAN PARK ◽  
GUYOUNG CHO ◽  
...  
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Self Assembly ◽  
Specific Area ◽  
Mesoporous Structure ◽  
Growth Behavior ◽  
Solid Oxide ◽  
Nano Particles ◽  
Pluronic F127 ◽  
Doped Ceria ◽  
Structure Directing Agent

The effect of NiO contents on the microstructure of mesoporous NiO - Gd 0.25 Ce 0.75 O 2-x ( NiO -GDC) composite for intermediate temperature solid oxide fuel cells (IT-SOFC) was investigated. Mesoporous NiO -GDC powders with different NiO contents were synthesized by self-assembly hydrothermal method using tri-block copolymer, Pluronic F127, as a structure directing agent. Grain growth/agglomeration behaviors of NiO particles and changes of mesoporous structure of GDC particles were characterized by microstructural analyses. NiO -GDC powders were composed of GDC nano particles with ordered mesopore inside the particles and octahedral NiO grains with truncated-edges. As the amount of NiO increases, specific area value of mesoporous NiO -GDC was decreased, and the agglomeration/growth behavior of NiO grains was accelerated.

Synthesis of Self-Assembly Au Nano-Particles Based on Sodium Citrate-Tannin Reduction Method

2011 ◽  
Vol 311-313 ◽  
pp. 461-465
Author(s):  
Dau Chung Wang ◽  
Shinn Hwa Chen ◽  
Gen You Chen ◽  
Ken Yen Chen ◽  
Cheng Hsien Tsai
Keyword(s):  
Particle Size ◽  
Self Assembly ◽  
Reduction Method ◽  
Low Cost ◽  
Trisodium Citrate ◽  
Nano Particles ◽  
Size Dependent ◽  
Biological Toxicity ◽  
The One ◽  
Au Nano Particles

Recently, self-assembly synthesis of metal nano-particles has attracted great interest due to its unique size dependent properties. In this study, an easy synthesis would be developed to form Au nano-particles which are without toxicity. The Au particles could be applied in biological and biological toxicity experiments. Some phenomena could be discovered in this paper. First, the concentration ratio of Au and trisodium citrate would be adjusted to control the Au nano-particles size. And the particle size is limited because of the size dependent energy would be discovered in this paper. The minimum particle size is also found. The one phase liquid reduction method is easy and without toxicity, it is low-cost, high-throughput, and suitable to be applied in biological and biological toxicity studies.

scholarly journals Chemically induced self-assembly of spherical and anisotropic inorganic nanocrystals

2011 ◽  
Vol 21 (42) ◽  
pp. 16694 ◽  
Author(s):  
Dmitry Baranov ◽  
Liberato Manna ◽  
Antonios G. Kanaras
Keyword(s):  
Self Assembly ◽  
Chemically Induced ◽  
Inorganic Nanocrystals

Simple Use of SiO2 Film Thickness for the Control of Carbon Nano-Tube Diameter During Ferrocene Catalyzed CVD Growth

2002 ◽  
Vol 739 ◽  
Author(s):  
N. Chopra ◽  
P.D. Kichambare ◽  
R. Andrews ◽  
B. J. Hinds
Keyword(s):  
Film Thickness ◽  
Line Width ◽  
Self Assembly ◽  
Iron Catalyst ◽  
Catalyst Support ◽  
Sio2 Film ◽  
Nano Particles ◽  
Scale Line ◽  
Cvd Growth ◽  
Carbon Nano Tube

ABSTRACTSelective growth of carbon nano-tubes (CNT) on micron scale patterned substrates has been accomplished by taking advantage of the non-reactivity of ferrocene catalyst on H-terminated Si surfaces in a CVD process. Demonstrated here is that this phenomenon can be used to control the diameter of CNTs when sufficiently narrow lines of SiO2 surrounded by H-terminated Si are used. Narrow lines of SiO2 (12–60nm) are formed at the etched face of a Si/SiO2/Si multilayer structure. This allows the precisely controllable thickness of an SiO2 film to determine an exposed SiO2 line width. There is no need for e-beam lithography since film thickness determines nm-scale line dimensions. CNTs are then formed by CVD with a ferrocene/H2/Ar mixture at 700°C. CNTs are observed to grow only on the exposed SiO2 surface at the edge of the ‘mesa’ structure. CNT diameters of 13.2, 20.5, 34.2, 64.3nm are observed for SiO2 film thickness of 12, 19, 35, and 65 nm. The larger distribution of CNT diameter with increased line width is consistent with wider SiO2 linewidths not being able to affect smaller nucleation centers. These results are consistent with the use of self-assembly chemistry of iron catalyst onto nano-particles of catalyst support.

Agaricus brasiliensis mushroom betaglucans solutions: Physicochemical properties and griseofulvin solubilization by self-assembly micro-nano particles formation

2014 ◽  
Vol 4 (2) ◽  
pp. 144-154 ◽  
Author(s):  
Maria L.C. Gonzaga ◽  
Thiago M.F. Menezes ◽  
Luciana M. Rebêlo ◽  
José R.R. de Souza ◽  
Nágila M.P.S. Ricardo ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Self Assembly ◽  
Nano Particles ◽  
Agaricus Brasiliensis

scholarly journals Chiral Pentaphenylpyrrole Derivatives with Aggregation-Induced Emission Enhancement and Aggregation Induced Circular Dichroism and Their Helical Self-assembly

2021 ◽  
Vol 267 ◽  
pp. 02012
Author(s):  
Yuanyuan Wang ◽  
Longlong Zhang ◽  
Junge Zhi
Keyword(s):  
Circular Dichroism ◽  
Self Assembly ◽  
Nano Particles ◽  
Mixed Solution ◽  
Induced Circular Dichroism ◽  
Aggregation Induced Emission ◽  
Water Fraction ◽  
Chiral Compounds ◽  
Emission Enhancement ◽  
Circular Dichroïsm

A pair of enantiomers (S)-P5PdiAM and (R)-P5PdiAM containing two chiral substituents, and their raceme rac-P5PdiAM were synthesized by introducing (R)-/(S)- or racemic 1-phenylethylamine into 1-biphenyl-2,3,4,5-tetraphenylpyrrole. The target compounds all show weak aggregation-induced emission enhancement (AIEE) characteristics in the DMSO/H2O mixed system, indicating that the introduction of chirality hardly affect the photophysical properties of the compound. In addition, the chiral compounds (S)-P5PdiAM and (R)-P5PdiAM show strong circular dichroism (CD) signals in THF/H2O mixed solution with a water fraction of 70%, that is, they exhibit aggregation-induced circular dichroism characteristics (AICD). Because the aggregates of (S)-P5PdiAM and (R)-P5PdiAM emit weakly, there is no circularly polarized luminescence (CPL) signals upon aggregation. The chiral compounds (S)-P5PdiAM and (R)-P5PdiAM can self-assemble to form helical nanofibers in a THF/H2O mixture with a water fraction of 70%, while the racemic rac-P5PdiAM assembled to form nano-particles, indicating that chiral substituents have a great influence on the self-assembly and the morphologies of the nano-aggregates.

scholarly journals Engineering transferrable microvascular meshes for subcutaneous islet transplantation

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Wei Song ◽  
Alan Chiu ◽  
Long-Hai Wang ◽  
Robert E. Schwartz ◽  
Bin Li ◽  
...  
Keyword(s):  
Self Assembly ◽  
Induced Pluripotent Stem Cell ◽  
Patient Specific ◽  
Proof Of Concept ◽  
Vascular Regeneration ◽  
Assembly Method ◽  
Chemically Induced ◽  
Subcutaneous Space ◽  
Induced Pluripotent

Abstract The success of engineered cell or tissue implants is dependent on vascular regeneration to meet adequate metabolic requirements. However, development of a broadly applicable strategy for stable and functional vascularization has remained challenging. We report here highly organized and resilient microvascular meshes fabricated through a controllable anchored self-assembly method. The microvascular meshes are scalable to centimeters, almost free of defects and transferrable to diverse substrates, ready for transplantation. They promote formation of functional blood vessels, with a density as high as ~220 vessels mm-2, in the poorly vascularized subcutaneous space of SCID-Beige mice. We further demonstrate the feasibility of fabricating microvascular meshes from human induced pluripotent stem cell-derived endothelial cells, opening a way to engineer patient-specific microvasculature. As a proof-of-concept for type 1 diabetes treatment, we combine microvascular meshes and subcutaneously transplanted rat islets and achieve correction of chemically induced diabetes in SCID-Beige mice for 3 months.

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