TY - JOUR
T1 - Applied magnetic field rejects the coating of ferromagnetic carbon from the surface of ferromagnetic cobalt
T2 - RAPET of CoZr2(acac) 2(OiPr)8
AU - Pol, Vilas G.
AU - Pol, Swati V.
AU - Gedanken, Aharon
AU - Kessler, Vadim G.
AU - Seisenbaeva, Gulaim A.
AU - Sung, Mun Gyu
AU - Asai, Shigeo
PY - 2005/4/7
Y1 - 2005/4/7
N2 - We present the results of the RAPET (reaction under autogenic pressure at elevated temperatures) dissociation of CoZr2(acac)2(O iPr)8 at 700°C in a closed Swagelok cell under an applied magnetic field of 10 T. It produces a mixture of carbon-coated and noncoated metastable ZrO2 nanoparticles, bare metallic Co nanoparticles, and bare carbon. The same reaction in the absence of a magnetic field produces spherical Co and ZrO2 particles in sizes ranging from 11 to 16 nm and exhibiting, at room temperature, metastable phases: fee for cobalt and a tetragonal phase for zirconia. The metastable phases of Co and ZrO2 are manifested because of a carbon shell of ∼4 nm thickness anchored to their surfaces. The effect of an applied magnetic field to synthesize morphologically different, but structurally the same, products is the key topic of the present paper.
AB - We present the results of the RAPET (reaction under autogenic pressure at elevated temperatures) dissociation of CoZr2(acac)2(O iPr)8 at 700°C in a closed Swagelok cell under an applied magnetic field of 10 T. It produces a mixture of carbon-coated and noncoated metastable ZrO2 nanoparticles, bare metallic Co nanoparticles, and bare carbon. The same reaction in the absence of a magnetic field produces spherical Co and ZrO2 particles in sizes ranging from 11 to 16 nm and exhibiting, at room temperature, metastable phases: fee for cobalt and a tetragonal phase for zirconia. The metastable phases of Co and ZrO2 are manifested because of a carbon shell of ∼4 nm thickness anchored to their surfaces. The effect of an applied magnetic field to synthesize morphologically different, but structurally the same, products is the key topic of the present paper.
UR - http://www.scopus.com/inward/record.url?scp=17044368785&partnerID=8YFLogxK
U2 - 10.1021/jp0445728
DO - 10.1021/jp0445728
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AN - SCOPUS:17044368785
SN - 1520-6106
VL - 109
SP - 6121
EP - 6125
JO - Journal of Physical Chemistry B
JF - Journal of Physical Chemistry B
IS - 13
ER -