Influence of Particle Size, Applied Compression, and Substratum Material on Particle-Surface Adhesion Force Using the Centrifuge Technique

Autor(es)

Felicetti, Marcos A. ^[1] ; Salazar-Banda, Giancarlo R. ^[2] ; Coury, Jose R. ^[1] ; Aguiar, Monica L. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed Sao Carlos, Dept Chem Engn, BR-13565905 Sao Carlos, SP - Brazil

^[2] Univ Sao Paulo, Chem Inst Sao Carlos, Sao Carlos, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Industrial & Engineering Chemistry Research; v. 48, n. 2, p. 877-887, JAN 21 2009.
• Citações Web of Science: 8

Resumo

The centrifuge technique was used to investigate the influence of particle size, applied compression, and substrate material (stainless steel, glass, Teflon, and poly(vinyl chloride)) on particle-surface adhesion force. For this purpose, phosphatic rock (rho(p) = 3090 kg/m(3)) and manioc starch particles (rho(p) = 1480 kg/m(3)) were used as test particles. A microcentrifuge that reached a maximum rotation speed of 14 000 rpm and which contained specially designed centrifuge tubes was used in the adhesion force measurements. The curves showed that the adhesion force profile followed a normal log distribution. The adhesion force increased linearly with particle size and with the increase of each increment of compression force. The manioc starch particles presented greater adhesion forces than the phosphatic rock particles for all particle sizes studied. The glass substrate showed a higher adherence than the other materials, probably due to its smoother topographic surface roughness in relation to the other substrata. (AU)

• Processo FAPESP: 06/50692-2 - O uso do metodo sol-gel para a producao de recobrimentos de sio2 e/ou ceo2 sobre ligas de aluminio utilizadas na industria aeronautica para a protecao contra a corrosao.
• Beneficiário: Giancarlo Richard Salazar Banda
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado