| Автор | Doriano Brogioli |
| Автор | Alberto Vailati |
| Автор | Marzio Giglio |
| Дата выпуска | 2000-02-28 |
| dc.description | Concentration fluctuations in a homogeneous mixture are in general small and confined to the molecular lengthscale. It has been recently predicted that stressed fluids should exhibit anomalously large fluctuations. We will show here that anomalously large fluctuations also occur when macroscopic concentration gradients relax to the uniform state via diffusion. The measurements have been taken by low angle static light scattering and shadowgraphs. We find that at larger wavevectors the amplitude of the fluctuations diverges as q <sup>-4</sup> . It is also found that gravity stabilizes at a constant value the fluctuations below a critical wavevector. We will present data on a mixture close to a consolution critical point. Recent results will also be presented on ordinary liquid mixtures, a polymer and a protein solution. These new results have been obtained by means of a quantitative shadowgraph technique. They confirm that giant fluctuations are always associated with mass flow due to diffusion across a macroscopic gradient. |
| Формат | application.pdf |
| Издатель | Institute of Physics Publishing |
| Название | Giant fluctuations in diffusion processes |
| Тип | paper |
| DOI | 10.1088/0953-8984/12/8A/305 |
| Electronic ISSN | 1361-648X |
| Print ISSN | 0953-8984 |
| Журнал | Journal of Physics: Condensed Matter |
| Том | 12 |
| Первая страница | A39 |
| Последняя страница | A46 |
| Аффилиация | Doriano Brogioli; Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica, Università di Milano, via Celoria 16, Milano, Italy |
| Аффилиация | Alberto Vailati; Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica, Università di Milano, via Celoria 16, Milano, Italy |
| Аффилиация | Marzio Giglio; Istituto Nazionale per la Fisica della Materia and Dipartimento di Fisica, Università di Milano, via Celoria 16, Milano, Italy |
| Выпуск | 8A |
