2009
DOI: 10.1590/s0103-97332009000200014
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Abstract: A dynamical freezing, which is the analogous of a glass transition, is observed at large concentrations in aqueous dispersions of maghemite nanoparticles. We study experimentally the structure and the dynamical properties of two dense ferroglass-formers in two very distinct states of interparticle interaction, either strongly repulsive or attractive. The static structure of the magnetic colloidal dispersions is probed by means of Small Angle X-ray Scattering both in and without the presence of an external magn… Show more

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Cited by 9 publications
(11 citation statements)
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References 30 publications
(51 reference statements)
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“…However under these glassy conditions, such "freshly prepared" samples 18 present ageing with time and slow dynamics 26 which are also anisotropic under an applied eld. 35 The heterogeneous nature of this dynamics has been demonstrated in zero eld. 36 One could eventually hypothesize that, in that case, the under-eld anisotropy of s transforms into an anisotropy of the heterogeneities.…”
Section: Discussionlimits Of the Modelmentioning
confidence: 91%
“…However under these glassy conditions, such "freshly prepared" samples 18 present ageing with time and slow dynamics 26 which are also anisotropic under an applied eld. 35 The heterogeneous nature of this dynamics has been demonstrated in zero eld. 36 One could eventually hypothesize that, in that case, the under-eld anisotropy of s transforms into an anisotropy of the heterogeneities.…”
Section: Discussionlimits Of the Modelmentioning
confidence: 91%
“…5 compares the structure factor of a 30% attractive ferroglass based on nanoparticles of characteristics very close to these of MNP2 [15] with S(q) of NP2/C-copolymer clusters. If at low q's the cluster form factor determines the cluster structure factor, at more local spatial scales (i.e.…”
Section: Article In Pressmentioning
confidence: 99%
“…Comparison between the structure factor of MNP2/C-copolymer clusters (open symbol) and the structure factor of an attractive ferroglass at a nanoparticle volume fraction F ¼ 30% from Ref [15]. (solid symbol).…”
mentioning
confidence: 99%
“…Figura 15 -Fatores de estrutura de nanopartículas de maguemita em meio aquoso citratadas: a) Amostra A com φ = 30% e [cit] livre = 0,03 mol/L apresentando interações repulsivas e amostra B com φ = 29% e [cit] livre = 0,5mol/L com interações atrativas caracterizadas pelo aumento na curvatura em baixo q. [69] b) Amostra com φ = 7% em diferentes concentrações de citrato, exceto os quadrados vazios que são de outra amostra com φ = 9%. [38] Nas figura 15 são apresentados exemplos de fatores de estrutura repulsivos e atrativos de nanopartículas de magemita citratada.…”
Section: (A) (B)unclassified
“…Outras abordagens podem ser utilizadas a fim de obter uma melhor correspondência com os dados experimentais adicionando parâmetros e adaptando suas peculiaridades, como por exemplo, o modelo proposto por Beaucage [91] que utiliza uma função global de espalhamento relacionando as regiões de Guinier e de Porod. Por outro lado, o procedimento utilizado nesse trabalho para obter os fatores de estrutura é amplamente empregado em diversos trabalhos acadêmicos [32,38,47,48,50,53,69,70,90,[92][93][94] apresentando resultados razoáveis, não sendo necessária a preocupação direta com as especificidades do fator de forma.…”
Section: Fator De Formaunclassified