Synthesis and characterization of air-stable aluminum nanoparticles and its application for hydrogen storage = 내산화 특성이 개선된 알루미늄 나노입자의 제조, 특성 및 수소저장 응용

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Air stable aluminum nanoparticles for generation of hydrogen were synthesized by wet chemical process. Aluminum hydride (alane) was prepared using aluminum chloride to replace expensive alane solution. Oleic acid was applied to form organic layer on surface of aluminum nanoparticles, called passivation. The size and distribution of aluminum nanoparticles are controlled by concentration of capping agent and catalyst. XRD (X-ray Diffraction), SEM (Scanning Electron Microscopy), TEM (Transmission Electron Microscopy), FTIR (Fourier Transform Infrared Spectroscopy) were used to study the surface analysis. Simple floating test and ignition test were developed to identify organic passivated aluminum nanoparticles. TGA (Thermogravimetric Analysis) and measurement volume of hydrogen generation were suggested to study active aluminum content in aluminum nanoparticles. $AlCl_3$ and $LiAlH_4$ were reacted with a molar ratio of 1:3 AlH3 in diethyl ether for more than 12 hr and produced AlH3 which was decomposed to aluminum by titanium isopropoxide (TTIP). The average size of aluminum particles 100 nm by adding optimized amount of TTIP (18 mM). The time of alane decomposition reaction also affected on formation of particles, and optimized reaction time was 40 min. The concentration of capping agent had a little impact on particle size, but it was sure that excess amount of capping agent caused agglomeration of particles in spite of washing. TEM images showed that smooth organic coating layer was formed on aluminum surface in the case of organic-passivated aluminum, whereas air-passivated aluminum had rough surface with oxide layer. Both cases showed the thickness of layer was 2-3 nm. The hydrogen generation by the aluminum nanoparticles was investigated and developed to measure active aluminum content in particles.
Advisors
Park, Seung-Binresearcher박승빈researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2011
Identifier
467717/325007  / 020093462
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 생명화학공학과, 2011.2, [ vi, 60 p. ]

Keywords

aluminum; nanoparticles; passivation; 알루미늄; 나노입자; 액상법; 수소기체; hydrogen

URI
http://hdl.handle.net/10203/179959
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=467717&flag=dissertation
Appears in Collection
CBE-Theses_Master(석사논문)
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