Design007 Magazine

Design-Feb2018

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FEBRUARY 2018 I DESIGN007 MAGAZINE 75 Associate members receive regular updates on consortium activities via periodic emails. Visit www.ipc2581.com for up-to-date information on the format itself and the activities of the consortium, as well as support status and tech- nical assistance. To join the consortium, click Join at the top of the page. DESIGN007 Hemant Shah is IPC-2581 Consortium chair and product management group director for Allegro PCB Products at Cadence Design Systems. Ed Acheson is IPC-2581 Technical Committee chair and principal product engineer for Allegro PCB Products at Cadence Design Systems. houses and their manufacturing partners. The IPC-2581 Consortium continues to aid software vendors supporting the format as well as to design houses and manufacturing companies who are adopting the standard. The IPC-2581 Consortium offers technical and networking assistance to help you along the way. Through the consortium, you can easily learn from the experiences of others who have successfully adopted IPC-2581. Join the Consortium Be part of a unique movement in the elec- tronics industry; we welcome new members at any time. There are two ways to join the consortium: become a corporate member or become an associate member. There is no fee, and there are no contracts required to join. Corporate members are invited to participate in bi-weekly business and technical meetings. Researchers from the East China University of Science and Technology in Shanghai, China; the Georgia Institute of Technology in Atlanta, USA; and Pusan National Univer- sity in Pusan, South Korea have developed an unconven- tional strategy to prepare photoswitchable, porous films. Their success stems from a simple method based on condensation patterns known as breath figures. Breath figures are formed when water vapor condenses as a pattern of tiny drop- lets on a cold solid or liquid surface, like when you breathe onto a cold window. One block of the polymer network has photoresponsive side- chains with azobenzene units that change their conformation (cis–trans isomerization) in reac- tion to light. The other block can be crosslinked to fix the configuration of the film. Irradiation with UV light or heating changes a part of the azobenzene units to the bent cis form, irra- diation with visible light causes the groups to preferen- tially adopt the straight trans form. If the visible light is linearly polarized, the side chains arrange themselves in parallel. This rearrangement causes displacement of the material. Careful control of the direction of polarization allows the researchers to transform the origi - nally round micropores into a variety of different shapes, such as rounded rectangles, or rounded rhombuses. The researchers hope to use their new produc- tion method to make robust, switchable films for electronics, photon- ics, efficient separation and purification pro- cesses, and functional biomaterials for regen- erative therapies. Pores With a Memory

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