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Synthesis of RNA-Amphiphiles via Atom Transfer Radical Polymerization in the Organic Phase

Precision Chemistry 2023年第5期1卷 326-331页

作者： jaepil jeong Grzegorz Szczepaniak Subha R.Das Krzysztof Matyjaszewski Department of Chemistry Carnegie Mellon UniversityPittsburghPennsylvania 15213United States Center for Nucleic Acids Science&Technology Carnegie Mellon UniversityPittsburghPennsylvania 15213United States University of Warsaw Faculty of Chemistry02-093 WarsawPoland

The combination of hydrophobic polymers with nucleic acids is a fascinating way to engineer the self-assembly behavior of nucleic acids into diverse nanostructures such as micelles,vesicles,nanosheets,and *** we developed a robust route to synthesize a RNA macroinitiator with protecting groups on the 2′-hydroxyl groups in the solid phase using an oligonucleotide *** protecting groups successfully solubilized the RNA macroinitiator,enabling atom transfer radical polymerization(ATRP)of hydrophobic *** a result,the RNA−polymer hybrids obtained by ATRP exhibited enhanced chemical stability by suppressing *** addition,we demonstrated evidence of controlled polymerization behavior as well as control over the molecular weight of the hydrophobic polymers grown from *** envision that this methodology will expand the field of RNA−polymer conjugates while vastly enhancing the possibility to alter and engineer the properties of RNA-based polymeric materials.

关键词： ATRP RNA RNA-amphiphiles nucleic acid block copolymer RNA−polymer conjugate TBDMS SBiB phosphoramidite solid-phase RNA synthesis

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Improvement in classification accuracy of stainless steel alloys by laser-induced breakdown spectroscopy based on elemental intensity ratio analysis

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Plasma Science and Technology 2020年第7期22卷 83-91页

作者： Sungho SHIN Youngmin MOON jaepil LE Eunsung KWON Kyihwan PARK Sungho jeong School of Mechanical Engineering Gwangju Institute of Science and Technology1 Oryong-dong Buk-gu Gwangju 500-712Republic of Korea Engineering Solution Research Group Research Institute of Industrial Science and Technology67 Cheongam-ro Nam-gu Pohang-si Gyeongsangbuk-doRepublic of Korea

Laser-induced breakdown spectroscopy(LIBS) is a useful technique for accurate sorting of metal scrap by chemical composition *** this work,a method for intensity-ratiobased LIBS classification of stainless steel applicable to highly fluctuating LIBS signal conditions is *** spectral line pairs for intensity ratio calculation are selected according to elemental concentration and upper levels of emission *** is demonstrated that the classification accuracy can be significantly improved from that of full-spectra principal component analysis or intensity-based *** proposed method is considered to be suited to an industrial scrap sorting system that requires minimal maintenance and low system price.

关键词： laser-induced breakdown spectroscopy(LIBS) stainless steel classification intensity ratio

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Signal processing for real-time identification of similar metals by laser-induced breakdown spectroscopy

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Plasma Science and Technology 2019年第3期21卷 84-91页

作者： Sungho SHIN Youngmin MOON jaepil LEE Hyemin JANG Euiseok HWANG Sungho jeong School of Mechanical Engineering Gwangju Institute of Science and Technology

Laser-induced breakdown spectroscopy(LIBS) is regarded as a promising technique for realtime sorting of scrap metals due to its capability of fast multi-elemental and in-air analysis. This work reports a method for signal processing which ensures high accuracy and high speed during similar metal sorting by LIBS. Similar metals such as aluminum alloys or stainless steel are characterized by nearly the same constituent elements with slight variations in elemental concentration depending on metal type. In the proposed method, the original data matrix is substantially reduced for fast processing by selecting new input variables(spectral lines) using the information for the constituent elements of similar metals. Specifically, principal component analysis(PCA) of full-spectra LIBS data was performed and then, based on the loading plots, the input variables of greater significance were selected in the order of higher weights for each constituent element. The results for the classification test with aluminum alloy, copper alloy,stainless steel and cast steel showed that the classification accuracy of the proposed method was nearly the same as that of full-spectra PCA, but the computation time was reduced by a factor of 20 or more. The results demonstrated that incorporating the information for constituent elements can significantly accelerate classification speed without loss of accuracy.

关键词： laser-induced breakdown spectroscopy classification similar metal reduced number of spectral lines

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Three-dimensionalization via control of laser-structuring parameters for high energy and high power lithium-ion battery under various operating con ditions

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Journal of Energy Chemistry 2022年第1期31卷 93-102,I0004页

作者： Junsu Park Hyeongi Song Inseok Jang jaepil Lee jeongwook Um Seong-guk Bae Jihun Kim Sungho jeong Hyeong-Jin Kim Ground Technology Research Insutitute Agency for Defense Development.P.O.Box 35Yuseong-guDaejeon 34186Republic of Korea Graduate School of Energy Convergence Gwangju Institute of Science and Technology123 Cheomdangwagi-ro.Buk-guGwangju 61005Republic of Korea School of Mechanical Engineering Gwangju Institute of Science and Technology123 Cheomdangwagi-ro.Buk-gu.Gwangju 61005Republic of Korea

Laser-structuring is an effective method to promote ion diffusion and improve the performance of lithium-ion battery(LIB)*** this work,the effects of laser structuring parameters(groove pitch and depth)on the fundamental characteristics of LIB electrode,such as interfacial area,internal resistances,material loss and electrochemical performance,are investigated,LiNi_(0.5)Co_(0.2)Mn_(0.3)O_(2) cathodes were structured by a femtosecond laser by varying groove depth and pitch,which resulted in a material loss of 5%-14%and an increase of 140%-260%in the in terfacial area between electrode surface and *** is shown that the importance of groove depth and pitch on the electrochemical performance(specific capacity and areal discharge capacity)of laser-structured electrode varies with current *** pitch is more im porta nt at low current rate but groove depth is at high curre nt *** the mapping of lithium concentration within the electrodes of varying groove depth and pitch by laser-induced breakdown spectroscopy,it is verified that the groove functions as a diffusion path for lithium *** ionic,electronic,and charge transfer resistances measured with symmetric and half cells showed that these internal resistances are differently affected by laser structuring parameters and the changes in porosity,ionic diffusion and electronic *** is demonstrated that the laser structuring parameters for maximum electrode performance and minimum capacity loss should be determined in consideration of the main operating conditions of LIBs.

关键词： Lithium-ion battery Laser structuring Energy density Power density Laser induced breakdown spectroscopy Lithium-ion diffusion

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