Coatings and Nanoparticles Manufactured with Coldab® from Picodeon

By AZoNano.com Staff Writers

Topics Covered


Introduction
Nanoparticle Coating of Pt Manufactured with Coldab®
Nanoparticles of TiO2 Manufactured with Coldab®

Carbon Nitride Coating Manufactured with Coldab®
Non-stick coating manufactured with Coldab®
Coldab® Advantages
Applications
About Picodeon - Nanotechnology Surface Treatments

 

Introduction

The patented Coldab laser deposition technology from Picodeon is beneficial for any kind of layer deposition on any kind of material. With the Coldab technology, previously impossible things are now possible. Layers are inclusive of different functional thin coatings and films that have a very strong adhesion to heat-sensitive materials such as paper and plastic. Coldab enables eco-friendly and cost-effective production through energy saving, a shorter cycle time and by increasing surface production from a pinhead size to large sheets.

Nanoparticle Coating of Pt Manufactured with Coldab®

Background

The challenge in this study was to increase a Pt catalyst’s specific surface area in a fuel cell application. The solution is Pt nanoparticles deposited with Coldab. Normally, platinum and transition metals act as catalysts. Pt is highly effective as a catalyst; however, the high material cost hampers it being used extensively.

Since catalytic action is associated with the available surface area, the material can be used more effectively if it is in nanoparticle form. It is important that size distribution, adhesion and crystallinity are simultaneously controlled.

Results

The results are shown in the Figures 1 and 2.

Figure 1. Nanostructured platinum for catalytic applications

Figure 2. TEM characterization (right) showed good agreement with AFM characterization (left), i.e.particle size (31.7±18.9) nm (mean±st. dev.)

Nanoparticles of TiO2 Manufactured with Coldab®

Background

The challenge is to make nano-structured TiO2(titania) for an undisclosed application on metallic substrates. TiO2 nanoparticles are deposited on titanium and other materials and titanium using Coldab laser deposition technology. It is important to simultaneously control crystallinity, adhesion and size distribution of nanoparticles.

Results

The results of the study are shown in Figure 3. The size of nanoparticles in different regimes were controlled from a few nm to 150nm. XRD and TEM measurements confirmed the crystallinity.

Figure 3. AFM picture of TiO2 nanoparticles with dimensions of 20-26nm.

Carbon Nitride Coating Manufactured with Coldab®

Background

The challenge is to deposit the material Carbon Nitride (C3N4), on a plastic substrate. Graphitic carbon nitride, commercially available with the brand name Nicanite from www.carbodeon.com can be used for biocompatible medical coatings, tribological coatings, insulators, chemically inert coatings and for energy-storage solutions. This material is available globally in very small quantities hence the data available on deposition and properties of thin films is very scant.

Results

Figure 4 shows the water-repellent micro- and nano-textured PP surface on the left and water-adherent modification with Nicanite® coating is on the right. The coating significantly improved cell attachment (below). The roughness of the coating on polypropylene is (7.1±5.1)nm. The contact angle for uncoated, textured surface is 146.2±1.6° and 53.5±1.4• for coated surface.

Figure 4. Carbon nitride coating

Non-stick coating manufactured with Coldab®

Background

The challenge is to combine non-stick properties with high wear resistance in a coating application for the food industry. The solution was a composite of amorphous diamond and silicone using Coldab® laser deposition technology.

Non-stick coatings are based on polymers that are not wear-resistant. In order to make the coating compatible with several cycles of cleaning and operation it is essential to incoporate wear resistance.

The polymer can be mixed with a harder material to form a composite, combining the properties of two materials. With traditional coating techniques, it is almost impossible to make such graded composites.

Results

The result is that several material combinations were studied and a composite of silicone and AD was finally chosen. Other options could have been fluoropolymers, alumina, titania or an appropriate combination of all these materials. Figure 5 shows a non-stick, wear resistant coating on stainless steel.

The treatment reduced accumulation of material on the coating from 108mg/test area to 0.0mg/test area. Hardened steel ball did not wear the coating in pin-on-disk test (6mm ball, 100g, 100 rounds, wear track 5mm in diameter.

Figure 5. Non-stick, wear-resistant coating on stainless steel. The form of the droplets is an indication of the high contact angle.

Coldab® Advantages

The advantages of Coldab are:

  • Ability to reproducibly deposit composites and/or graded structures of materials from very different material groups, e.g. to improve wear resistance
  • Accurate control of the size of deposited nanoparticles
  • Control of crystallinity of the deposited material
  • Excellent adhesion of the deposited layers
  • Efficient use of expensive source material
  • Ability to implement the process on an industrial scale
  • Deposition of heat-sensitive materials
  • Deposition of heat-sensitive substrates
  • Control of elasticity of coating
  • Control of stoichiometry
  • Extremely high deposition rate

Applications

The production of most industrially important chemicals uses catalysts. Catalysts are also used in fuel cells. Carbon nitride coating manufactured with Coldab is used in medical, life-science and tribological applications and energy storage. Non-stick coatings are used in the food and process industry, for household goods, in medical applications and for displays for handheld devices such as mobile phones.

About Picodeon - Nanotechnology Surface Treatments

Picodeon is a Finnish nanotechnology company specializing in thin film coatings and surface treatments with its patented Coldab® Ultra-Short Pulsed Laser Deposition (USPLD) process.

Picodeon has extensive experience of delivering thin-film applications with wear-resistant, low-friction, biocompatible, thermal-conductivity and electrical-conductivity thin-film properties. Picodeon provides equipment, solutions and services for its clients worldwide.

Picodeon is located in Ii, Finland and is financially backed by Enso Ventures.

This information has been sourced, reviewed and adapted from materials provided by Picodeon - Nanotechnology Surface Treatments.

For more information on this source, please visit Picodeon - Nanotechnology Surface Treatments.

Date Added: Jul 30, 2014 | Updated: Aug 13, 2014
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