A research group led by Professor MOCHIDA Tomoyuki (Kobe University Graduate School of Science) and Dr. FUNASAKO Yusuke (Tokyo University of Science, Yamaguchi) has developed a metal-containing compound which transforms into a solid when exposed to light and returns to liquid form when heated. This substance could potentially be used for photolithography technology, such as fabricating printed circuits, among other applications.
The findings were published in the journal Chemical Communications on May 7, 2016 (Japan Standard Time).
Coordination polymers are solids with various useful applications. In recent years, research into coordination polymers has increased, and scientists have developed many ways to synthesize them, but most of these methods rely on chemical reactions in solutions. This is the first example of a method that creates coordination polymers by exposing liquids to light.
Techniques that can control the properties of materials through external stimuli such as light and heat are extremely important in creating materials for use in electronics. For example, materials which solidify when exposed to light (photosensitive resins) are used in creating printed circuits, but it is difficult to reuse these materials.
Professor Mochida’s research group proposed that if they could control the binding process between metal ions and organic molecules using heat and light, they could create a material that drastically changes its properties when exposed to external stimuli. The group became the first in the world to develop an ionic liquid from a ruthenium complex with cyano groups. This liquid is colorless, clear, non-volatile, and does not freeze even at -50?. If you apply ultraviolet light to the liquid for a few hours, it changes into an amorphous coordination polymer, and if you heat this solid for one minute at 130?, it returns to its original ionic liquid form.
In this way, by applying light and heat, the group realized a reversible transformation between an ionic liquid and a solid coordination polymer — two substances with completely different structures and different chemical properties.
This research has led to the successful creation of a reusable photocurable liquid. It can potentially be applied to printed circuit boards, 3D printing, and adhesives. Professor Mochida comments, “We plan to continue research on the molecular design of this substance, to reduce its response time, and look into creating more functions for this coordination polymer.”
Ionic liquids are salts with melting point below 100?. Their melting point is very low compared to standard salts such as sodium chloride. In many cases, the cations of ionic liquids are formed from organic compounds. Their properties include non-volatility, non-flammability, and ionic conductivity. They can potentially function as electrolytes or environmentally-friendly reaction solvents.
These are substances in which metal ions and organic ligands combine in repeated coordinate bonds. They have various electronic properties and the ability for adsorption and desorption due to their network structures. In recent years, they have been a popular research topic as functional solids with many potential uses.
The Latest on: Reusable photocurable liquid
via Google News
The Latest on: Reusable photocurable liquid
- Hackaday Prize Entry: Printem Is Polaroid For PCBson January 12, 2020 at 4:00 pm
It consists of a thin conductive copper foil that is held to a transparent carrier substrate by a photocurable adhesive film. The other side of the copper features a layer of holding adhesive ...
- Design of highly stabilized nanocomposite inks based on biodegradable polymer-matrix and gold nanoparticles for Inkjet Printingon November 6, 2019 at 2:29 am
The printed pattern was further dried with heat gun until the residual liquid was fully evaporated. The ultimate goal is to get a stable ink using sugar-based comb-like polyurethanes that not only ...
- Fastening productivity kiton November 8, 2017 at 1:59 am
In contrast, the manufacturer can dispense UV/visible light-curing adhesives with an inexpensive dispenser, clamp parts together with a reusable clamp, and put the part into a 5-ft-long Dymax UV ...
- GaAs photovoltaics and optoelectronics using releasable multilayer epitaxial assemblieson May 19, 2010 at 5:00 pm
After undercut etching, the arrays were transfer printed to a Si wafer coated with a photocurable polyurethane, and connected to a computer for image acquisition. For single-junction solar cells ...
- Industry's Amazing Instant Prototypes Turning computerized designs into solid objects--even salable products--takes just the press of a button.on January 1, 2001 at 3:59 am
A laser, which causes molecules of a photosensitive liquid resin to fuse when it hits ... A gallon of acrylic blends of photocurable liquids fetches about $750. But so great is industry's hunger ...
via Bing News