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Experimental and computational studi...

Zhao, Hong.

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Experimental and computational studies of flame synthesis of nanoparticles: Effects of pressure, precursor loading, and electric field.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Experimental and computational studies of flame synthesis of nanoparticles: Effects of pressure, precursor loading, and electric field./
作者:	Zhao, Hong.
面頁冊數:	210 p.
附註:	Adviser: Stephen D. Tse.
Contained By:	Dissertation Abstracts International68-02B.
標題:	Engineering, Mechanical. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3253031

Experimental and computational studies of flame synthesis of nanoparticles: Effects of pressure, precursor loading, and electric field.
Zhao, Hong.

Experimental and computational studies of flame synthesis of nanoparticles: Effects of pressure, precursor loading, and electric field. - 210 p.

Adviser: Stephen D. Tse.

Thesis (Ph.D.)--Rutgers The State University of New Jersey - New Brunswick, 2007.

The synthesis of nanoparticles (e.g. TiO2) is investigated experimentally and computationally in low-pressure H2/O 2/N2 burner-stabilized flat flames in a stagnation point geometry, using a metal-organic (e.g. titanium tetra-iso-propoxide, TTIP) precursor. A flow modeling program with detailed chemical kinetics and transport is used to simulate the temperature and flow-velocity fields, and is compared with measurements using laser induced fluorescence (LIF) to map gas-phase temperature and OH-radical concentration. Properties of as-synthesized particles, e.g. phase and crystallinity, morphologies and primary particle size, aggregate particle size, and particle surface area are evaluated by X-ray diffraction (XRD), transmission electron microscopy (TEM), dynamic light scattering (DLS), Brunauer-Emmet-Teller (BET) measurement, and thermogravimeteric analysis (TGA), respectively.Subjects--Topical Terms:

783786
Engineering, Mechanical.

Experimental and computational studies of flame synthesis of nanoparticles: Effects of pressure, precursor loading, and electric field.
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035 $a (UMI)AAI3253031
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040 $a UMI $c UMI
100 1 $a Zhao, Hong. $3 1279414
245 1 0 $a Experimental and computational studies of flame synthesis of nanoparticles: Effects of pressure, precursor loading, and electric field.
300 $a 210 p.
500 $a Adviser: Stephen D. Tse.
500 $a Source: Dissertation Abstracts International, Volume: 68-02, Section: B, page: 1276.
502 $a Thesis (Ph.D.)--Rutgers The State University of New Jersey - New Brunswick, 2007.
520 $a The synthesis of nanoparticles (e.g. TiO2) is investigated experimentally and computationally in low-pressure H2/O 2/N2 burner-stabilized flat flames in a stagnation point geometry, using a metal-organic (e.g. titanium tetra-iso-propoxide, TTIP) precursor. A flow modeling program with detailed chemical kinetics and transport is used to simulate the temperature and flow-velocity fields, and is compared with measurements using laser induced fluorescence (LIF) to map gas-phase temperature and OH-radical concentration. Properties of as-synthesized particles, e.g. phase and crystallinity, morphologies and primary particle size, aggregate particle size, and particle surface area are evaluated by X-ray diffraction (XRD), transmission electron microscopy (TEM), dynamic light scattering (DLS), Brunauer-Emmet-Teller (BET) measurement, and thermogravimeteric analysis (TGA), respectively.
520 $a A monodisperse model and a sectional model, coupled with the simulated flow field and flame structure, are employed to model particle growth dynamics, thereby determining final properties, e.g. primary and aggregate particle size. The monodisperse model, which neglects polydispersity of the nanoparticles, computes aggregate and primary particle sizes accounting only for coagulation and coalescence. The sectional model computes aggregate particle size distribution, geometric standard deviation, and average primary particle size by taking into consideration precursor decomposition, nucleation, particle-to-particle coagulation, coalescence, and surface growth. These models are compared to each other, as well as to the experiments. For in-situ characterization of nanoparticles in the flow field, a low-pressure aerosol sampling system connected to a nano scanning mobility particle sizer (nano-SMPS) was designed and built. The SMPS results compare well with predictions from the sectional model, indicating that modeling is not only essential for fundamental understanding but also useful for designing and optimizing the processes for nanopowder production.
520 $a Uniform electric fields are introduced to further control particle growth characteristics. The results show that the aggregate particle size, primary particle size, and specific surface area can be tailored by manipulating particle residence times with different electric field strengths and directions. Effects of operating pressures and precursor-loading rates on particle growth are also examined. Higher pressures produce larger aggregate particles, but with smaller primary particles, due to longer residence times. Higher precursor-loading rates result in larger aggregate particles, with slightly smaller primary particles.
590 $a School code: 0190.
650 4 $a Engineering, Mechanical. $3 783786
690 $a 0548
710 2 $a Rutgers The State University of New Jersey - New Brunswick. $3 1017590
773 0 $t Dissertation Abstracts International $g 68-02B.
790 $a 0190
790 1 0 $a Tse, Stephen D., $e advisor
791 $a Ph.D.
792 $a 2007
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3253031