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Electrostatic and Hydrophobic on Recognition and Deacylation of an Anionic Ester by Ni(II)-Macrocyclic Complexes Built on Poly(ethylenimine)

  • Suh, Jung-Hun;Kim, No-Won
    • Bulletin of the Korean Chemical Society
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    • v.14 no.2
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    • pp.292-294
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    • 1993

  • Three derivatives of poly(ethylenimine) (PEI) are prepared by Ni(II)-template condensation with glyoxal(GO): PEI[Ni(II)-GO]$_{0.08}$ (1), PEI[Ni(II)-GO]$_{0.03}$ (2), and lau$_{0.18}$PEI[Ni(II)-GO]$_{0.03}$ (3). The contents of Ni(II)-macrocyclic center of 1-3 are 8%, 3%, or 3%, respectively, of the monomer residues, and 18% of monomer residues for 3 are laurylated. The pH profiles for k$_{cal}$ and k$_m$ for the deacylation of 4-carboxy-2-nitrophenyl acetate are measured. The relative magnitude of the parameters for 1-3 and different shapes of the pH profiles for 1-3 are explained in terms of the electrostatic and the hydrophobic effects exerted by the metal centers and lauryl groups. For the artificial metalloenzymes built on PEI, therefore, the ionization of functional groups and the affinity toward counter-anions can be controlled by adjusting charge density and the content of hydrophobic groups.

  • https://doi.org/10.5012/bkcs.1993.14.2.292 인용 PDF

Effects of cellulose nanocrystals and graphene oxide on hydration heat of cement paste (셀룰로오스 나노크리스탈과 산화그래핀이 시멘트 페이스트의 수화열에 미치는 영향)

  • Lee, Yun-Kyung;Kim, Ji-Hyun;Chung, Chul-Woo
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.189-190
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    • 2023

  • In this study, the compressive strength and hydration heat of cement paste mixed with cellulose nanocrystal(CNC) and graphene oxide (GO) were evaluated. The difference was compared by mixing 0.1 vol.% ~0.4 vol.% of CNC and 0.05 wt.% ~ 0.1 wt.% of GO in a cement paste with a water cement ratio of 0.3. As a result, it was confirmed that the compressive strength increased as CNC and GO were mixed respectively, and then the compressive strength decreased when the appropriate mixing rate was exceeded. In the hydration heat measurement, there was no significant difference when only CNC was mixed, but it was confirmed that the hydration heat decreased as the amount of CNC mixing increased when used in combination with GO.

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특집: '2011 치킨 페스티벌' 둘러보기 -'구구절절' 닭이야기

  • 한국계육협회
    • Monthly Korean Chicken
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    • v.17 no.5
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    • pp.76-83
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    • 2011

  • 2011 치킨 페스티벌의 사전 이벤트로 진행됐던 '구구절절 닭이야기'. 직장, 학교 등에서 닭에 얽힌 재미있거나 감동적인 에피소드 중 10점을 선정, 사연의 주인공들에게 치킨을 배달해 드렸다. 올해는 어떤 이야기들이 선정됐는지 지금부터 이야기 속으로 go go!!

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