Anomalous Brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations
As recently reported [Turiv T. et al., Science, 2013, Vol. 342, 1351], fluctuations in the orientation of the liquid crystal (LC) director can transfer momentum from the LC to a colloid, such that the diffusion of the colloid becomes anomalous on a short time scale. Using video microscopy and single...
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| Дата: | 2015 |
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| Автори: | , , |
| Формат: | Стаття |
| Мова: | English |
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Інститут фізики конденсованих систем НАН України
2015
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/153591 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Anomalous Brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations / T. Turiv, A. Brodin, V.G. Nazarenko // Condensed Matter Physics. — 2015. — Т. 18, № 2. — С. 23001: 1–13. — Бібліогр.: 48 назв. — англ. |
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irk-123456789-1535912019-06-15T01:25:17Z Anomalous Brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations Turiv, T. Brodin, A. Nazarenko, V.G. As recently reported [Turiv T. et al., Science, 2013, Vol. 342, 1351], fluctuations in the orientation of the liquid crystal (LC) director can transfer momentum from the LC to a colloid, such that the diffusion of the colloid becomes anomalous on a short time scale. Using video microscopy and single particle tracking, we investigate random thermal motion of colloidal particles in a nematic liquid crystal for the time scales shorter than the expected time of director fluctuations. At long times, compared to the characteristic time of the nematic director relaxation we observe typical anisotropic Brownian motion with the mean square displacement (MSD) linear in time τ and inversly proportional to the effective viscosity of the nematic medium. At shorter times, however, the dynamics is markedly nonlinear with MSD growing more slowly (subdiffusion) or faster (superdiffusion) than τ. These results are discussed in the context of coupling of colloidal particle's dynamics to the director fluctuation dynamics. Як було нещодавно опублiковано в [Turiv T. et al., Science, 2013, 342, 1351], флуктуацiї в орiєнтацiї рiдкокристалiчного (РК) директора можуть переносити iмпульс вiд РК до колоїда, тодi дифузiя самого колоїда стає аномальною на коротких промiжках часу. Використовуючи методи вiдеомiкроскопiї та одночастинкового вiдстеження, ми дослiджували випадковий тепловий рух колоїдної частинки в нематичному РК на часах, коротших за очiкуваний час флуктуацiй директора. На довгих часах, в порiвнянi з характеристичним часом релаксацiї нематичного директора, ми спостерiгали типовий анiзотропний броунiвський рух з середнiм квадратом змiщення частинки пропорцiйним до часу τ та обернено пропорцiйним до ефективної в’язкостi нематичного середовища. Однак на коротших часах, динамiка помiтно вiдрiзняється вiд лiнiйної, середнiй квадрат змiщення в цьому випадку зростає повiльнiше (субдифузiя) або швидше (супердифузiя) вiд τ. Результати пояснюються в контектсi зв’язку динамiки колоїдної частинки з динамiкою флуктуацiй директора. 2015 Article Anomalous Brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations / T. Turiv, A. Brodin, V.G. Nazarenko // Condensed Matter Physics. — 2015. — Т. 18, № 2. — С. 23001: 1–13. — Бібліогр.: 48 назв. — англ. 1607-324X PACS: 05.40.Jc, 61.30.-v DOI:10.5488/CMP.18.23001 arXiv:1506.03952 http://dspace.nbuv.gov.ua/handle/123456789/153591 en Condensed Matter Physics Інститут фізики конденсованих систем НАН України |
| institution |
Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| collection |
DSpace DC |
| language |
English |
| description |
As recently reported [Turiv T. et al., Science, 2013, Vol. 342, 1351], fluctuations in the orientation of the liquid crystal (LC) director can transfer momentum from the LC to a colloid, such that the diffusion of the colloid becomes anomalous on a short time scale. Using video microscopy and single particle tracking, we investigate random thermal motion of colloidal particles in a nematic liquid crystal for the time scales shorter than the expected time of director fluctuations. At long times, compared to the characteristic time of the nematic director relaxation we observe typical anisotropic Brownian motion with the mean square displacement (MSD) linear in time τ and inversly proportional to the effective viscosity of the nematic medium. At shorter times, however, the dynamics is markedly nonlinear with MSD growing more slowly (subdiffusion) or faster (superdiffusion) than τ. These results are discussed in the context of coupling of colloidal particle's dynamics to the director fluctuation dynamics. |
| format |
Article |
| author |
Turiv, T. Brodin, A. Nazarenko, V.G. |
| spellingShingle |
Turiv, T. Brodin, A. Nazarenko, V.G. Anomalous Brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations Condensed Matter Physics |
| author_facet |
Turiv, T. Brodin, A. Nazarenko, V.G. |
| author_sort |
Turiv, T. |
| title |
Anomalous Brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations |
| title_short |
Anomalous Brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations |
| title_full |
Anomalous Brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations |
| title_fullStr |
Anomalous Brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations |
| title_full_unstemmed |
Anomalous Brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations |
| title_sort |
anomalous brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations |
| publisher |
Інститут фізики конденсованих систем НАН України |
| publishDate |
2015 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/153591 |
| citation_txt |
Anomalous Brownian motion of colloidal particle in a nematic environment: effect of the director fluctuations / T. Turiv, A. Brodin, V.G. Nazarenko // Condensed Matter Physics. — 2015. — Т. 18, № 2. — С. 23001: 1–13. — Бібліогр.: 48 назв. — англ. |
| series |
Condensed Matter Physics |
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2023-05-20T17:41:48Z |
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2023-05-20T17:41:48Z |
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