Physica A-statistical Mechanics and Its Applications, 2004
We consider a region bounded by two conductors held to a constant voltage bias, one of them with ... more We consider a region bounded by two conductors held to a constant voltage bias, one of them with an irregular rough shape and the other being a at one. The irregular proÿle can be either a curve with a formation rule or the result of a deposition process. The rough shape of the proÿle in uences the equipotential lines, which we have characterized by numerically evaluating their roughness exponent and fractal dimension D f . For a ÿxed ÿnite size system, the less corrugated lines, far away from the rough proÿle, have higher . For a line corresponding to a ÿxed value of the potential, the roughness exponent decreases with the size of the proÿle, suggesting that a single constant value characterizes all lines for an inÿnite system.
Magnetic mesoporous particles were synthesized and their magnetic and structural properties are r... more Magnetic mesoporous particles were synthesized and their magnetic and structural properties are reported. The synthesis procedure consists of four steps: (i) preparation of magnetite colloidal nanoparticles; (ii) growth of a silica layer; (iii) development of the mesoporous structure and (iv) template removal. Two different methods for the template removal were studied and their effectiveness was discussed. Magnetization and Mössbauer spectroscopy measurements showed superparamagnetic behavior for the particles at room temperature. X-ray diffraction and nitrogen adsorption measurements showed a mesoporous MCM-41 structure with 2.48 nm pore diameter and 1023 m 2 /g total area.
Profº Tecgº, Me André R. Q. Panesi PROPRIEDADES FÍSICAS a) Densidade ( ) É a relação entre a mas... more Profº Tecgº, Me André R. Q. Panesi PROPRIEDADES FÍSICAS a) Densidade ( ) É a relação entre a massa de uma substância e o volume ocupado pela mesma. = m /V ( Kg/m 3 ) b) Peso Específico() É a relação do peso da substância e o volume ocupado pela mesma. = P / V = mg / V = .g ( N/ m 3 ) c) Condutividade Térmica (k) Propriedade que possuem certos corpos de transmitir com maior ou menor facilidade o calor.
Physica A-statistical Mechanics and Its Applications, 2004
We consider a region bounded by two conductors held to a constant voltage bias, one of them with ... more We consider a region bounded by two conductors held to a constant voltage bias, one of them with an irregular rough shape and the other being a at one. The irregular proÿle can be either a curve with a formation rule or the result of a deposition process. The rough shape of the proÿle in uences the equipotential lines, which we have characterized by numerically evaluating their roughness exponent and fractal dimension D f . For a ÿxed ÿnite size system, the less corrugated lines, far away from the rough proÿle, have higher . For a line corresponding to a ÿxed value of the potential, the roughness exponent decreases with the size of the proÿle, suggesting that a single constant value characterizes all lines for an inÿnite system.
Magnetic mesoporous particles were synthesized and their magnetic and structural properties are r... more Magnetic mesoporous particles were synthesized and their magnetic and structural properties are reported. The synthesis procedure consists of four steps: (i) preparation of magnetite colloidal nanoparticles; (ii) growth of a silica layer; (iii) development of the mesoporous structure and (iv) template removal. Two different methods for the template removal were studied and their effectiveness was discussed. Magnetization and Mössbauer spectroscopy measurements showed superparamagnetic behavior for the particles at room temperature. X-ray diffraction and nitrogen adsorption measurements showed a mesoporous MCM-41 structure with 2.48 nm pore diameter and 1023 m 2 /g total area.
Profº Tecgº, Me André R. Q. Panesi PROPRIEDADES FÍSICAS a) Densidade ( ) É a relação entre a mas... more Profº Tecgº, Me André R. Q. Panesi PROPRIEDADES FÍSICAS a) Densidade ( ) É a relação entre a massa de uma substância e o volume ocupado pela mesma. = m /V ( Kg/m 3 ) b) Peso Específico() É a relação do peso da substância e o volume ocupado pela mesma. = P / V = mg / V = .g ( N/ m 3 ) c) Condutividade Térmica (k) Propriedade que possuem certos corpos de transmitir com maior ou menor facilidade o calor.
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