Metal surfaces a few tens of square centimeters in size can already be structured without much experimental difficulty through a combination of microcontact printing and an etching process. Researchers are currently working to develop a simple production technology that is also broadly applicable for large surfaces. A team at Philips Research in Eindhoven in the Netherlands has now developed a universally applicable “ink” for microcontact printing.
The first step in microcontact printing is the production of an elastomeric malleable stamp by means of a mold. The stamp is then loaded with a special “ink” and is pressed onto the metal surface to be printed. The ink sticks to the metal surface and reproduces the microstructure of the stamp in a monomolecular layer. This monolayer acts as a corrosion-resistant mask in the subsequent etching process: the coated areas are not affected, whereas the metal in the uncoated areas is etched away, transferring the microstructure to the metal. Precious and coinage metals are both used, as are materials with oxidic surfaces, such as silicon and aluminum. Each type of surface requires a different type of ink to stick to it: precious and coinage metals need ink molecules that can be bound by means of a metal–sulfur bond. Oxidic surfaces bind molecules with an acid functionality, such as carboxylic acids or phosphonic acids. Substrates that have different types of metals on their surface are thus not easy to structure. Also, identical structures cannot be transferred onto different substrates with the same stamp, because once loaded, the stamp cannot be “washed” off and loaded with a different ink easily—and production of a new stamp is the most expensive part of the process.
The researchers led by Dirk Burdinski have now developed a universally applicable ink. It consists of a mixture of both types of ink, sulfur-containing octadecanethiol and octadecanephosphonic acid. When polydimethylsiloxane stamps are loaded with this ink, both types of metals can be structured. The individual components of the ink are selectively transferred to their corresponding surface without interfering with each other. This universal ink is potentially also useful for the coating of microfluidic systems on diagnostic chips, as these often have inner wall structures made of different materials. Also electronic component blocks requiring good adherence of the protective coating to different components could thus first be homogenized at the surface, allowing for better sealing.Author: Dirk Burdinski, Philips Research, Eindhoven (The Netherlands), mailto:email@example.com
Researchers target protein that protects bacteria's DNA 'recipes'
21.08.2018 | University of Rochester
Protein interaction helps Yersinia cause disease
21.08.2018 | Schwedischer Forschungsrat - The Swedish Research Council
There are currently great hopes for solid-state batteries. They contain no liquid parts that could leak or catch fire. For this reason, they do not require cooling and are considered to be much safer, more reliable, and longer lasting than traditional lithium-ion batteries. Jülich scientists have now introduced a new concept that allows currents up to ten times greater during charging and discharging than previously described in the literature. The improvement was achieved by a “clever” choice of materials with a focus on consistently good compatibility. All components were made from phosphate compounds, which are well matched both chemically and mechanically.
The low current is considered one of the biggest hurdles in the development of solid-state batteries. It is the reason why the batteries take a relatively long...
New design tool automatically creates nanostructure 3D-print templates for user-given colors
Scientists present work at prestigious SIGGRAPH conference
Most of the objects we see are colored by pigments, but using pigments has disadvantages: such colors can fade, industrial pigments are often toxic, and...
Scientists at the University of California, Los Angeles present new research on a curious cosmic phenomenon known as "whistlers" -- very low frequency packets...
Scientists develop first tool to use machine learning methods to compute flow around interactively designable 3D objects. Tool will be presented at this year’s prestigious SIGGRAPH conference.
When engineers or designers want to test the aerodynamic properties of the newly designed shape of a car, airplane, or other object, they would normally model...
Researchers from TU Graz and their industry partners have unveiled a world first: the prototype of a robot-controlled, high-speed combined charging system (CCS) for electric vehicles that enables series charging of cars in various parking positions.
Global demand for electric vehicles is forecast to rise sharply: by 2025, the number of new vehicle registrations is expected to reach 25 million per year....
17.08.2018 | Event News
08.08.2018 | Event News
27.07.2018 | Event News
21.08.2018 | Ecology, The Environment and Conservation
21.08.2018 | Life Sciences
21.08.2018 | Power and Electrical Engineering