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SUMMARY:On the importance and estimation of local heat dissipation of inte
 racting magnetic nanoparticles subjected to an applied magnetic field
DTSTART;VALUE=DATE-TIME:20170717T154000Z
DTEND;VALUE=DATE-TIME:20170717T155500Z
DTSTAMP;VALUE=DATE-TIME:20260717T233740Z
UID:indico-contribution-4078@indico.ific.uv.es
DESCRIPTION:Speakers: Cristina Munoz-Menendez (Instituto de Investigación
 s Tecnolóxicas and Departamento de Física Aplicada\, Universidade de San
 tiago de Compostela\, Spain)\nControlling the heat dissipated by magnetic 
 nanoparticles (MNPs) subjected to an alternating magnetic field HAC is cru
 cial for the effectiveness of several applications such as heat-mediated d
 rug delivery\, which uses the heat generated by MNPs attached to some ther
 mo-sensitive carrier to activate the release of the drug\; or magnetic flu
 id hyperthermia (MFH)\, a promising technique for cancer treatment which u
 ses the heat released by MNPs under AC fields to damage the cancer cells. 
 Some experiments1\,2\,3 reported that during the exposure of MNPs to an AC
  field\, the temperature may increase several tens of kelvins at the parti
 cle surface and then rapidly decay to zero only a few nanometers away. The
 refore\, addressing the local (at individual particle level) heat dissipat
 ion becomes very relevant4. \nIn MFH\, global (whole system) heat dissipat
 ion is usually obtained from the area of the magnetization vs. applied fie
 ld M(H) hysteresis loops. However\, using the same approach for local hyst
 eresis cycles is not adequate for strong-interacting systems because coupl
 ed particles may have inverted hysteresis loops and therefore negative hys
 teresis areas. \nThe aim of this work is to find an alternative way to eva
 luate local released energy. To do so\, we work with the kinetic Monte Car
 lo technique\, which is suitable to describe heating processes of interact
 ing particle systems5. Our premise is that the hysteresis area of the enti
 re system stands for the total dissipated energy. We developed an approach
  where we analyze the different types of jumps of the energies of individu
 al particles and from there we are able recover the area of the entire sys
 tem.\n\nThis work was cofinanced by the Spanish MINECO (Project MAT2013-47
 078-C2-2-P)\, Xunta de Galicia\, Spain (Project GRC 2014/013\, ‘Programa
  de axudas á etapa predoutoral’ and financial support of D.S. under Pla
 n I2C) and ‘Fondo Social Europeo 2014/2020’.\n\nhttps://indico.ific.uv
 .es/event/2851/contributions/4078/
LOCATION:Facultad Química (USC) Aula Química Analítica
URL:https://indico.ific.uv.es/event/2851/contributions/4078/
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