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Homogeneous precipitation of nickel ...

Mavis, Bora.

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Homogeneous precipitation of nickel hydroxide powders.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Homogeneous precipitation of nickel hydroxide powders./
作者:	Mavis, Bora.
面頁冊數:	199 p.
附註:	Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0396.
Contained By:	Dissertation Abstracts International65-01B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3118245

Homogeneous precipitation of nickel hydroxide powders.
Mavis, Bora.

Homogeneous precipitation of nickel hydroxide powders. - 199 p.

Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0396.

Thesis (Ph.D.)--Iowa State University, 2003.

Structure of nickel precipitate from decomposition of urea was found to be alpha-Ni(OH)2. FTIR analysis revealed the intercalation of cyanate (OCN), which is an intermediate product of urea decomposition. This observation implied that the assumption of single step decomposition of urea to carbon dioxide and ammonia was over simplified. Role of critical experimental parameters like initial pH and metal ion concentration on the powder characteristics was carried out. Numerical solutions to reaction pathways predicted significant accumulation of the intermediate cyanate in the time-temperature range investigated. Numerical simulations included the effects of hydrolysis products of Ni2+ and Ni-amine, Ni-cyanate, and Ni-carbonate complexes. Chemical analysis of the precipitate showed a decrease in nitrogen content with increasing reaction times. This was consistent with the predicted decrease in concentration of Ni-cyanate complexes with time.Subjects--Topical Terms:

1017759
Engineering, Materials Science.

Homogeneous precipitation of nickel hydroxide powders.
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100 1 $a Mavis, Bora. $3 1952829
245 1 0 $a Homogeneous precipitation of nickel hydroxide powders.
300 $a 199 p.
500 $a Source: Dissertation Abstracts International, Volume: 65-01, Section: B, page: 0396.
500 $a Major Professor: Mufit Akinc.
502 $a Thesis (Ph.D.)--Iowa State University, 2003.
520 $a Structure of nickel precipitate from decomposition of urea was found to be alpha-Ni(OH)2. FTIR analysis revealed the intercalation of cyanate (OCN), which is an intermediate product of urea decomposition. This observation implied that the assumption of single step decomposition of urea to carbon dioxide and ammonia was over simplified. Role of critical experimental parameters like initial pH and metal ion concentration on the powder characteristics was carried out. Numerical solutions to reaction pathways predicted significant accumulation of the intermediate cyanate in the time-temperature range investigated. Numerical simulations included the effects of hydrolysis products of Ni2+ and Ni-amine, Ni-cyanate, and Ni-carbonate complexes. Chemical analysis of the precipitate showed a decrease in nitrogen content with increasing reaction times. This was consistent with the predicted decrease in concentration of Ni-cyanate complexes with time.
520 $a Layer double hydroxides (LDHs) are intercalation compounds represented by the formula [M2+1-xM3+ x(OH)2]x+[An-x/n ]x-·mH2O. alpha-Ni(OH) 2 and Ni-Al layer double hydroxides precipitated by urea were investigated with FTIR and XPS. The role of cyanate in nucleation and growth of precipitates is demonstrated. In the early stages, cyanate ion is found mainly to be grafted into alpha-Ni(OH)2 via nitrogen, whereas later in the growth stages, it is bonded through oxygen. In LDHs cyanate remains N-bonded. Precipitation with substituted ureas, revealed the link between spectral features and structures observed in XRD patterns. With slower decomposition rates and low levels of supersaturation an extensively hydrated structure was observed. From the two phases of Ni(OH)2, alpha-phase, with its larger interlayer spacing, offers enhanced electrochemical properties but it transforms into thermodynamically stable beta-phase. Stabilizing effects of Ni2+ substitution with Co2+ and Al3+ was investigated. A number of three-component LDHs (TCLDHs) with Ni2+1-(x+y) /Co2+x and Al3+y (x and y were varied between 0.00 and, 0.25) were produced by urea precipitation. From the compositions studied, the ones containing [Al3+] o ≥ 0.015 M resulted with the LDH structure and proved to be stable in the electrolyte for prolonged times. Chronopotentiometry results indicated that TC-LDHs could deliver capacities up to about 30% higher than the beta-phase.
590 $a School code: 0097.
650 4 $a Engineering, Materials Science. $3 1017759
650 4 $a Chemistry, Inorganic. $3 517253
690 $a 0794
690 $a 0488
710 2 0 $a Iowa State University. $3 1017855
773 0 $t Dissertation Abstracts International $g 65-01B.
790 1 0 $a Akinc, Mufit, $e advisor
790 $a 0097
791 $a Ph.D.
792 $a 2003
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3118245