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박종갑,이규태,연규범,Jaemin Choi,김민규,Byeol Han,박형원,L. Jay Guo,Jong G. Ok 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.95 No.-
We demonstrate a facile one-step fabrication offlexible ridge waveguides by using the nanochannelguidedlithography (NCL) that enables continuous extrusion of a polymer that forms waveguiding coreridge on an undercladding polymer substrate. NCL utilizes a well-cleaved mold edge with microtrenchpatterns to slide continuously over a UV-curable liquid resin-coated substrate under conformal contact,where the resin and substrate can be chosen for suitable waveguide core and undercladding materials. The local heating of a trench mold can control the viscosity of liquid resin for optimalfilling into themicrochannels followed by smooth extrusion, which is subsequently UV-cured. Such a smoothlyextruded resin core exhibits a very smooth surface potentially promising for the low-loss waveguidingoperation which was experimentally confirmed by optical insertion loss characterization. The proposedtechnique may provide a practical route to the continuous and seamless fabrication of scalablewaveguides and photonic elements.
Byeong-Min Jeon,연규범,Hui-Gwan Goo,이경은,김대성 한국발생생물학회 2020 발생과 생식 Vol.24 No.2
Polyvinylidene fluoride (PVDF) is a stable and biocompatible material that has been broadly used in biomedical applications. Due to its piezoelectric property, the electrospun nanofiber of PVDF has been used to culture electroactive cells, such as osteocytes and cardiomyocytes. Here, taking advantage of the piezoelectric property of PVDF, we have fabricated a PVDF nanofiber scaffolds using an electrospinning technique for differentiating human embryonic stem cells (hESCs) into neural precursors (NPs). Surface coating with a peptide derived from vitronectin enables hESCs to firmly adhere onto the nanofiber scaffolds and differentiate into NPs under dual-SMAD inhibition. Our nanofiber scaffolds supported the differentiation of hESCs into SOX1-positive NPs more significantly than Matrigel. The NPs generated on the nanofiber scaffolds could give rise to neurons, astrocytes, and oligodendrocyte precursors. Furthermore, comparative transcriptome analysis revealed the variable expressions of 27 genes in the nanofiber scaffold groups, several of which are highly related to the biological processes required for neural differentiation. These results suggest that a PVDF nanofiber scaffold coated with a vitronectin peptide can serve as a highly efficient and defined culture platform for the neural differentiation of hESCs.