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30 results on '"Zheng, Fengyi"'

10. Optimization of Cas12a for multiplexed genome-scale transcriptional activation

Author

Griffith, Audrey L, primary, Zheng, Fengyi, additional, McGee, Abby V, additional, Miller, Nathan, additional, Szegletes, Zsofia M, additional, Reint, Ganna, additional, Gademann, Fabian, additional, Nwolah, Ifunanya, additional, Hegde, Mudra, additional, Liu, Yanjing V, additional, Goodale, Amy, additional, and Doench, John G, additional

Published
2023
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18. Semi-custom methodology to fabricate transmission electron microscopy chip for in situcharacterization of nanodevices and nanomaterials

Author

Yu, BoCheng, Sun, Mei, Pan, RuHao, Tian, JiaMin, Zheng, FengYi, Huang, Dong, Lyu, FengJiao, Zhang, ZhiTong, Li, JunJie, Chen, Qing, and Li, ZhiHong

Abstract

The fabrication of nanodevices on the delicate membrane window of the TEM (transmission electron microscopy) chip has the risk of breakage failure, limiting in-depth research in this area. This work proposed a methodology to address this issue, enabling secure in-situtransmission electron microscopic observation of many devices and materials that would otherwise be difficult to achieve. Combining semi-custom TEM chip design and front-side protected release technology, a variety of nanodevices were successfully fabricated onto the window membrane of the TEM chip and studied in situ.Moreover, the pressure tolerance of window membrane was investigated and enhanced with a reinforcing structure. As an example of typical applications, MoS2devices on the TEM chip have been fabricated and electron beam-induced gate modulation and irradiation damage effects, have been demonstrated.

Published
2022
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30. Versatile bio‐based epoxy resin: From banana waste to applied materials.

Author

Li, Ruisong, Li, Wei, Zheng, Fengyi, Zhang, Yucang, and Hu, Jiadan

Subjects
EPOXY resins, POLYAMIDES, BISPHENOL A, THERMOGRAVIMETRY, SHEAR strength
Abstract

Bio‐based epoxy resin is a promising candidate for petroleum‐based resins due to its abundant reserves and low‐cost products, which mainly use polyphenolic composites as precursors. Liquefied banana pseudo stem (LBPS), a highly active compound obtained by liquefaction with 7.5% of sulfuric acid as catalyst at 160°C, was used to synthesize bio‐based epoxy resin. FTIR and SEM demonstrated the synthetic process of LBPS‐based epoxy resin (LBPSER) from waste banana pseudo stem (BPS). Mechanical test, reagent resistance, dynamic mechanical analysis, and thermogravimetric analysis were utilized to evaluate the mechanical and chemical properties of LBPSER. With polyamide (PA) as hardener, LBPSER‐PA adhesive exhibited an optimum shear strength that is comparable with that of commercial diglycidyl ether of bisphenol A (DGEBA), corresponding to 11.86 vs 11.89 MPa. Interestingly, the shear strength of this adhesive curing at 40°C could get 9.52 MPa for wood materials. The adhesive also performed excellent resistance to organic agents, adverse acidic, and alkaline environments. Notably, as the content of LBPSER in adhesive increased, an increase of glass transition temperature could be verified from 42 to 100°C. The LBPSER‐PA adhesive presented good thermal and physicochemical performances, thereby suggesting the potential of utilizing liquefied product from BPS as alternative to toxic bisphenol A in synthesizing bio‐based epoxy resin. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47135. [ABSTRACT FROM AUTHOR]

Published
2019
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