Making Negative Poisson ' s Ratio Microstructures by Soft Lithography
نویسندگان
چکیده
1186 Ó WILEY-VCH Verlag GmbH, D-69469 Weinheim, 1999 0935-9648/99/1410-1186 $ 17.50+.50/0 Adv. Mater. 1999, 11, No. 14 quenching to room temperature. As a result, the polarization bandwidth was found to increase by a factor of 2.4 over what was expected of a constant-pitch film. The increased bandwidth was attributed to a pitch gradient resulting from photoinduced racemization of the chiral dopant at the irradiated surface with simultaneous diffusion through the film. This is the first demonstration of a pitch gradient generated in the mesomorphic fluid state and then frozen in a glassy chiral-nematic film.
منابع مشابه
Three-Dimensional Metallic Microstructures Fabricated by Soft Lithography and Microelectrodeposition
Soft lithography offers a convenient set of methods for the transfer of patterns to planar and nonplanar substrates. Microelectrodeposition can transform thin metal patterns into self-supporting microstructures, weld components together, and strengthen microstructures after deformations. Together, soft lithography and electrochemistry provide synergistic technologies and the basis for a strateg...
متن کاملSoft lithography in biology and biochemistry.
Soft lithography, a set of techniques for microfabrication, is based on printing and molding using elastomeric stamps with the patterns of interest in basrelief. As a technique for fabricating microstructures for biological applications, soft lithography overcomes many of the shortcomings of photolithography. In particular, soft lithography offers the ability to control the molecular structure ...
متن کاملStudy on the postbaking process and the effects on UV lithography of high aspect ratio SU-8 microstructures
John D. Williams Wanjun Wang Louisiana State University Department of Mechanical Engineering Baton Rouge, Louisiana 70803 E-mail: [email protected] Abstract. In recent years, a relatively new type of negative photoresist, EPON SU-8, has received a lot of attention in the MEMS field because of its excellent lithography properties. Significant research efforts have been made to study the lithographic ...
متن کاملFabrication of Piezoelectric Polyvinylidene Fluoride (PVDF) Microstructures by Soft Lithography for Tissue Engineering and Cell Biology Applications
A method for the fabrication of piezoelectric polyvinylidene fluoride (PVDF) microstructures is described. Embossed and individual features with highly defined geometries at the microscale were obtained using soft lithography-based techniques. Various structure geometries were obtained, including pillars (three different aspect ratios), parallel lines, and criss-crossed lines. SEM characterizat...
متن کاملCombinatorial Multilevel Mold Insert Using Micromachining and X-ray Lithography
The present technology advancement in biomedical, micro-electro-mechanical systems (MEMS) engineering, bio-MEMS, healthcare, etc. is driving the need to fabricate devices with multi-level, high aspect ratio and complex microstructures which in turn requires high quality mold inserts with all these features. This research addressed fabrication challenges of a PMMA mold insert template containing...
متن کامل