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SU-8 Photolithography and Its Impact on Microfluidics
Published in Sushanta K. Mitra, Suman Chakraborty, Fabrication, Implementation, and Applications, 2016
Rodrigo Martinez-Duarte, Marc J. Madou
SU-8 photoresist formulations are commercially available from MicroChem (www.microchem.com), in Newton, Massachusetts, and more recently from Gersteltec (www.gersteltec.ch), in Pully, Switzerland. The latter also offers SU-8 with different color dyes, carbon nanotubes, silica, or silver nanoparticles incorporated. MicroChem sells three different series of the product: SU-8 series, using gamma-butyrolactone (GBL) as the casting solvent, and SU-8 2000 and SU-8 3000 series where GBL is replaced by cyclopentanone. Cyclopentanone is a faster drying, more polar solvent system that results in improved coating quality and increased process throughput (Shaw et al., 2003).
Oxidation Reactions
Published in Michael B. Smith, A Q&A Approach to Organic Chemistry, 2020
In the first reaction, cyclopentanol is converted into cyclopentanone by the Jones reagent. In the second reaction octan-3-ol is converted into octan-3-one, and in the final example, 1-methylcycloheptanol is treated with Jones reagent. Since this is a tertiary alcohol, no oxidation takes place and the correct answer is no reaction.
Selective aqueous-phase hydrogenation of furfural to cyclopentanol over Ni-based CNT catalysts
Published in Environmental Technology, 2023
Haihong Xia, Jing Li, Jun Zhao, Minghao Zhou, Jianchun Jiang
In this paper, we demonstrated the synthesis of a series of Ni-based CNT catalysts for highly efficient hydrogenation of FFA to CPL in an aqueous medium, which showed a good conversion of FFA compared with a single metal catalyst Ni/CNT catalyst. More significantly, only a slight decrease of FFA conversion and CPL yield were detected after up to five runs. It was probably due to the leaching of metal active components on CNT support. In addition, all of the catalysts were characterized by XRD, TEM, XPS, H2-TPR and NH3-TPD analysis, and the reaction pathways were also proposed in the end. Furfural could be hydrogenated into different products. Nevertheless, furfuryl alcohol is the sole suitable substrate for the obtention of cyclopentanic molecules through Piancatelli-type rearrangement. The in-situ hydrogenation of the obtained hydroxy-cyclopentenone could afford mainly cyclopentanone and cyclopentanol, depending on the nature of the catalyst (such as acidity) [36–39]. The generation of those chemicals relying exclusively on the exploitation of fossil carbon, their production from biomass-derived materials appears particularly attractive.