Made available in DSpace on 2014-12-17T14:16:22Z (GMT). No. of bitstreams: 1 LucianaRS_Pre_textuais.pdf: 37160 bytes, checksum: 5c10ca3517f836e974edc672ecd286cb (MD5) Previous issue date: 2008-02-12 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The inorganic actives, represented mainly by microfine zinc oxide and titanium dioxide, have shown great potential to protect against large UV spectrum. The aim of this study is the development, characterization and analysis of stability in the short term of microemulsions containing inorganic fotoprotection agents. The microemulsions identified by the phases diagram containing the metallic oxides were produced by two different methods and subjected to the centrifugation test and thermal stress cycles, and subsequently characterized by macroscopic evaluation, test dilution, electrical conductivity, pH, particle size, and zeta potential. This study highlights the influence of the metal oxides addition in the structure and distribution of micelles in the microemulsions / Os agentes fotoprotetores inorg?nicos, representados principalmente pelo ?xido de zinco e di?xido de tit?nio microfinos, t?m mostrado grande potencial de prote??o contra amplo espectro de radia??o UV. O objetivo deste trabalho consiste no desenvolvimento, caracteriza??o e estudo de estabilidade a curto termo de microemuls?es contendo agentes fotoprotetores inorg?nicos. As microemuls?es identificadas pelo diagrama de fases e adicionadas dos ativos fotoprotetores foram elaboradas a partir de dois m?todos diferentes e submetidas ao teste de centrifuga??o e ciclos gelo-degelo, sendo posteriormente caracterizadas pela avalia??o macrosc?pica, teste de dilui??o, condutividade el?trica, pH, granulometria e determina??o de potencial zeta. Este estudo evidencia a influ?ncia da adi??o dos ?xidos met?licos na estrutura??o micelar e distribui??o de tamanho de part?culas das microemuls?es