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Systematic investigations on the ass...
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Hiramatsu, Hiroki.
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Systematic investigations on the assembly and properties of multicomponent nanostructures comprised of gold, silver, cadmium selenide, and silica nanoparticles.
紀錄類型:
書目-電子資源 : Monograph/item
正題名/作者:
Systematic investigations on the assembly and properties of multicomponent nanostructures comprised of gold, silver, cadmium selenide, and silica nanoparticles./
作者:
Hiramatsu, Hiroki.
面頁冊數:
106 p.
附註:
Source: Dissertation Abstracts International, Volume: 66-10, Section: B, page: 5393.
Contained By:
Dissertation Abstracts International66-10B.
標題:
Chemistry, Inorganic. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3191131
ISBN:
9780542346446
Systematic investigations on the assembly and properties of multicomponent nanostructures comprised of gold, silver, cadmium selenide, and silica nanoparticles.
Hiramatsu, Hiroki.
Systematic investigations on the assembly and properties of multicomponent nanostructures comprised of gold, silver, cadmium selenide, and silica nanoparticles.
- 106 p.
Source: Dissertation Abstracts International, Volume: 66-10, Section: B, page: 5393.
Thesis (Ph.D.)--University of California, Davis, 2005.
Syntheses of various types of nanoparticle clusters were achieved both by electrostatic assembly and covalent assembly. The electrostatically driven assembly was used to form SiO2-Au and SiO2-CdSe nanoparticle clusters from a reaction between SiO2-NH3+ and Au-COO- or CdSe-COO-. Acid/Base equilibria of nanoparticle surfaces were manipulated by the pH to attenuate surface charges which resulted in pH dependent nanoparticle cluster yields. The nanoparticle clusters were stable against intercluster particle transfers.
ISBN: 9780542346446Subjects--Topical Terms:
517253
Chemistry, Inorganic.
Systematic investigations on the assembly and properties of multicomponent nanostructures comprised of gold, silver, cadmium selenide, and silica nanoparticles.
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Source: Dissertation Abstracts International, Volume: 66-10, Section: B, page: 5393.
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Syntheses of various types of nanoparticle clusters were achieved both by electrostatic assembly and covalent assembly. The electrostatically driven assembly was used to form SiO2-Au and SiO2-CdSe nanoparticle clusters from a reaction between SiO2-NH3+ and Au-COO- or CdSe-COO-. Acid/Base equilibria of nanoparticle surfaces were manipulated by the pH to attenuate surface charges which resulted in pH dependent nanoparticle cluster yields. The nanoparticle clusters were stable against intercluster particle transfers.
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Covalently bonded nanoparticle clusters (SiO2-Au, SiO 2-Ag, and SiO2-CdSe) were prepared by reacting SiO2 -SH with Au, Ag, and CdSe nanoparticles. SiO2-Au and SiO 2-Ag nanoparticles showed stability against disassembly after reaction with oleylamine and dodecanethiol. SiO2-CdSe on the other hand were disassembled after the reaction with these ligands. The stability of SiO2-Au nanoparticle clusters was higher with smaller Au nanoparticles suggesting that the covalent bond strength between nanoparticles is dependent on size.
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Oleylamine-stabilized Au and Ag nanoparticles were prepared by reduction of HAuCl4 and Ag(C2H3O2) metal salts with oleylamine. 13∼21 nm Au nanoparticles were prepared by adjusting the initial concentration of HAuCl4. 9∼31 nm Ag nanoparticles were prepared by changing the reaction temperature and solvent (hexane, toluene, 1,2-dichlorobenzenes were used).
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Surface modifications of SiO2 nanoparticles were achieved with 3-mercaptopropyltrimethoxysilane (MPS), 3-aminopropyltrimethoxysilane (APS), and ethytrimethoxysilane (ES) in toluene/oleylamine (4:1, v/v) at room temperature. The ligand densities of SiO2-MPS and SiO2-APS were quantitatively determined to be 1.94 +/- 0.02 MPS/nm2 and 1.89 +/- 0.09 APS/nm2, respectively. In addition, mixed ligand SiO2-(MPS)x(ES)y were prepared by coinjecting MPS and ES in 1:3 ratio and the resulting nanoparticles showed MPS ligand density of 0.85 +/- 0.01 MPS/nm2.
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