• Title/Summary/Keyword: One-pot

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One-Pot Synthesis of Alkyl-Terminated Silicon Nanoparticles by Solution Reduction (표면 알킬기를 갖는 실리콘 나노입자의 One-Pot 용액환원 합성)

  • Yoon, Taegyun;Cho, Mikyung;Sun, Yang-Kook;Lee, Jung Kyoo
    • Korean Chemical Engineering Research
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    • v.49 no.5
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    • pp.577-581
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    • 2011

  • Silicon nanoparticles have attracted a great deal of scientific interests due to its intense photoluminescence in the visible spectral region and its potential applications in biological fluorescence maker, RGB (red, green, blue) display, photonics and photovoltaics etc. Practical applications making use of optical and physicochemical properties of Si nanoparticles requires an efficient synthetic method which allows easy modulation of their size, size distribution as well as surface functionalities etc. In this study, a one-pot solution reduction scheme is attempted to prepare alkyl-terminated Si nanoparticles (<10 nm) with Si precursors, (Octyl)$SiCl_3$ or mixture of (Octyl)$SiCl_3$ and $SiCl_4$, containing alkyl-groups using Na(naphthalide) as reducing agent. The surface capping of Si nanoparticles with octyl-groups as well as Si nanoparticle formation was achieved in one-pot reaction. The hexane soluble Si nanoparticles with octyl-termination were in the range of 2-10 nm by TEM and some oxide groups (Si-O-Si) was present on the surface by EDS/FTIR analyses. The optical properties of Si nanoparticles measured by UV-vis and PL evidenced that photoluminescent Si nanoparticles with alkyl-termination was successfully synthesized by solution reduction of alkyl-containing Si precursors in one-pot reaction.

  • https://doi.org/10.9713/kcer.2011.49.5.577 인용 PDF KSCI

The Effects of Containerized Landscape Tree Production Methods on Post-tansplant Strees (컨테이너에 의한 조경수 생산방식이 이식 후 활착에 미치는 영향)

  • 김태진;김학범
    • Journal of the Korean Institute of Landscape Architecture
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    • v.29 no.1
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    • pp.152-160
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    • 2001

  • This study is conducted to evaluate the effects of containerized landscape tree production methods on post-transplant stress. Two types of container such as plastic pot(pot), fabric growing bag(bag) were adopted to restrict tree roots. Each types of containers was divided into seven sub-types. One traditional production method was included as comparison. Two landscape woody plants species (Magnolia denudata, Albizzia julibrissin) were implanted in the 7 sub-types of container. After one or two growing season in the container, each types of container trees was transplanted. Half of the trees were transplanted in the mild spring season, and another half of trees were transplanted in the improper summer season. The data were collected on the crown wilting ratio and trunk die-back ratio. The result of the analysis based on these data were as follows; 1) The container production methods were lower than the traditional production methods by 3 times in the average wilting ratio of summer season's transplanting point. 2) Post-transplant stress was more successfully mitigated, in case the "pot" type as was the "bag" types of container. 3) The effective and economic way of mitigating post-transplant stress by container production methods was selecting container plants of vigorous and deep root systems. 4) The "pot" type of container was to restrict tree roots more successfully, But, winter chilling and low temperature attacked the "pot" type tree's twigs and suckers. These results indicated that "pot" grown container plants should managed carefully during the winter after transplanting. Based upon the results of this study, a subsequent research on the development of container material, growth type of the container trees, and other maintaining method will be required.es, and other maintaining method will be required.

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Facile and Convenient Synthesis and Characterization of Novel Schiff Bases Involving Heterocyclic Ring through One Pot Multicomponent Reactions under Mild Conditions (온화한 반응조건에서 One Pot 다성분 반응을 통해 이종원자고리를 포함한 새로운 시프염기의 쉽고 편리한 합성 및 특성)

A Simple and One-pot Oxidative Conversion of Alcohols or Aldehydes to the Nitriles using NaIO4/KI in Aqueous NH3

  • Zolfigol, Mohammad Ali;Hajjami, Maryam;Ghorbani-Choghamarani, Arash
    • Bulletin of the Korean Chemical Society
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    • v.32 no.12
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    • pp.4191-4194
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    • 2011

  • Sodium periodate ($NaIO_4$) and potassium iodide (KI) in aqueous ammonia has been used for the one-pot synthesis of nitriles from the corresponding aldehydes and alcohols in moderate to good yield. This transformation, proceeds via an in situ oxidation- imination-aldimine oxidation sequence.

  • https://doi.org/10.5012/bkcs.2011.32.12.4191 인용 PDF KSCI