Instability Phenomenon in Dip-Coating Process for Self-Assembly of Fine Particles and Design Countermeasures

2011 ◽  
Vol 5 (5) ◽  
pp. 688-693 ◽  
Author(s):  
Manabu Nishio ◽  
◽  
Nobuyuki Moronuki ◽  
Arata Kaneko
Keyword(s):  
Self Assembly ◽  
Fine Particles ◽  
Aqueous Suspension ◽  
Dip Coating ◽  
Selective Assembly ◽  
Pattern Design ◽  
Instability Phenomenon ◽  
Nano Structures ◽  
Improved Stability ◽  
Site Selective

The self-assembly of fine particles is a promising process for the production of nano-structures. In this process, aqueous suspension is often used. The spreading of the suspension on the substrate is a complex phenomenon that sometimes causes problems of instability. This paper discusses the instability phenomenon and proposes countermeasures from various aspects. It was found that special attention should be paid to the pattern design of site-selective assembly. Finally, complex structures made of particles of different sizes and materials are shown to demonstrate the improved stability after repeated dip-coating.

Fabrication of Patterned Ag and Au Inverse Opal Structures Through Repeated Self-Assembly of Fine Particles

2014 ◽  
Vol 8 (5) ◽  
pp. 755-760 ◽  
Author(s):  
Manabu Nishio ◽  
◽  
Nobuyuki Moronuki ◽  
Minoru Abasaki ◽  
◽  
...  
Keyword(s):  
Self Assembly ◽  
Fine Particles ◽  
Dip Coating ◽  
Silica Particles ◽  
The Self ◽  
Nano Particles ◽  
Inverse Opal ◽  
Patterned Substrate ◽  
Inverse Opal Structure ◽  
Gold Nano Particles

This study aims to apply the self-assembly process of particles to the fabrication of inverse opal structures, which improve the fabrication of catalysts and sensors. The process consists of two dip-coating steps. The first one is the production of sacrificial silica particles 1 or 2 µm in diameter. The second one is the fabrication of silver or gold nano-particles. After these processes, silica particles are dissolved to create the inverse opal structure. We demonstrate how changing the diameter of the sacrificial particle varies the size of the pores. Finally, we present how the patterned Ag and Au inverse opal structure can be created using the hydrophobic/hydrophilic patterned substrate.

TEM observation of iron oxide pillars in montmorillonite

1990 ◽  
Vol 48 (4) ◽  
pp. 882-883
Author(s):  
H. Mori ◽  
Y. Murata ◽  
H. Yoneyama ◽  
H. Fujita
Keyword(s):  
Aqueous Solution ◽  
Iron Oxide ◽  
Fine Particles ◽  
Aqueous Suspension ◽  
Volume Ratio ◽  
Exchange Capacity ◽  
Nano Composites ◽  
Pillared Montmorillonite ◽  
Topographic Features ◽  
Transmission Electron

Recently, a new sort of nano-composites has been prepared by incorporating such fine particles as metal oxide microcrystallites and organic polymers into the interlayer space of montmorillonite. Owing to their extremely large specific surface area, the nano-composites are finding wide application[1∼3]. However, the topographic features of the microstructures have not been elucidated as yet In the present work, the microstructures of iron oxide-pillared montmorillonite have been investigated by high-resolution transmission electron microscopy.Iron oxide-pillared montmorillonite was prepared through the procedure essentially the same as that reported by Yamanaka et al. Firstly, 0.125 M aqueous solution of trinuclear acetato-hydroxo iron(III) nitrate, [Fe3(OCOCH3)7 OH.2H2O]NO3, was prepared and then the solution was mixed with an aqueous suspension of 1 wt% clay by continuously stirring at 308 K. The final volume ratio of the latter aqueous solution to the former was 0.4. The clay used was sodium montmorillonite (Kunimine Industrial Co.), having a cation exchange capacity of 100 mequiv/100g. The montmorillonite in the mixed suspension was then centrifuged, followed by washing with deionized water. The washed samples were spread on glass plates, air dried, and then annealed at 673 K for 72 ks in air. The resultant film products were approximately 20 μm in thickness and brown in color.

Site-Selective Assembly and Reorganization of Gold Nanoparticles along Aminosilane-Covered Nanolines Prepared on Indium–Tin Oxide

Langmuir ◽  
2012 ◽  
Vol 28 (20) ◽  
pp. 7579-7584 ◽  
Author(s):  
Jeonghyeon Yang ◽  
Takashi Ichii ◽  
Kuniaki Murase ◽  
Hiroyuki Sugimura
Keyword(s):  
Gold Nanoparticles ◽  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Selective Assembly ◽  
Site Selective

Nanostructuring of diamond films using self-assembled nanoparticles

Open Physics ◽  
2009 ◽  
Vol 7 (2) ◽  
Author(s):  
Oleg Babchenko ◽  
Alexander Kromka ◽  
Karel Hruska ◽  
Miroslav Michalka ◽  
Jiri Potmesil ◽  
...  
Keyword(s):  
Plasma Etching ◽  
Self Assembly ◽  
Diamond Films ◽  
Diamond Powder ◽  
Gas Mixture ◽  
Assembly Strategy ◽  
Nano Structures ◽  
Mask Type ◽  
Different Types ◽  
Nano Rods

AbstractWe report the use of gold, nickel and diamond nanoparticles as a masking material for realization of diamond nano-structures by applying the dry plasma etching process. Applying low power plasma (100 W) in a gas mixture of CF4/O2 for 5 minutes results in a formation of three different types of diamond nanostructures, depending on the mask type material and particle size. Using of the Ni mask results in realization of diamond nano-rods, applying of the Au mask brings cauliflower-like structures, and using the diamond powder allows the production of irregular nano-structures. The main advance of the presented etching procedure is use of a self-assembly strategy where no lithographic steps are implemented.

scholarly journals Atomic layer deposition for efficient oxygen evolution reaction at Pt/Ir catalyst layers

2020 ◽  
Vol 11 ◽  
pp. 952-959
Author(s):  
Stefanie Schlicht ◽  
Korcan Percin ◽  
Stefanie Kriescher ◽  
André Hofer ◽  
Claudia Weidlich ◽  
...  
Keyword(s):  
Atomic Layer Deposition ◽  
Noble Metal ◽  
Bimetallic Catalyst ◽  
Precursor Solution ◽  
Atomic Layer ◽  
Dip Coating ◽  
Experimental Conditions ◽  
Catalyst Layers ◽  
Layer Deposition ◽  
Improved Stability

We provide a direct comparison of two distinct methods of Ti felt surface treatment and Pt/Ir electrocatalyst deposition for the positive electrode of regenerative fuel cells and vanadium–air redox flow batteries. Each method is well documented in the literature, and this paper provides a direct comparison under identical experimental conditions of electrochemical measurements and in identical units. In the first method, based on classical engineering, the bimetallic catalyst is deposited by dip-coating in a precursor solution of the salts followed by their thermal decomposition. In the alternative method, more academic in nature, atomic layer deposition (ALD) is applied to the felts after anodization. ALD allows for a controlled coating with ultralow noble-metal loadings in narrow pores. In acidic electrolyte, the ALD approach yields improved mass activity (557 A·g−1 as compared to 80 A·g−1 at 0.39 V overpotential) on the basis of the noble-metal loading, as well as improved stability.

An extremely rapid dip-coating method for self-assembly of octadecylphosphonic acid and its thermal stability on an aluminum film

2014 ◽  
Vol 2 (46) ◽  
pp. 9941-9948 ◽  
Author(s):  
Donghan Chen ◽  
Horace King Yin Wu ◽  
Soheila Naderi-Gohar ◽  
Yiliang Wu ◽  
Yining Huang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Metal Oxides ◽  
Self Assembly ◽  
Dip Coating ◽  
Aluminum Film ◽  
Full Coverage ◽  
Coating Method ◽  
Dip Coating Method ◽  
Octadecylphosphonic Acid

Solution of octadecylphosphonic acid in anisole enables formation of a full-coverage monolayer on metal oxides in a matter of seconds.

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