Two-step percolation in aggregating systems
The two-step percolation behavior in aggregating systems was studied both experimentally and by means of Monte Carlo (MC) simulations. In experimental studies, the electrical conductivity, σ, of colloidal suspension of multiwalled carbon nanotubes (CNTs) in decane was measured. The suspension was...
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| Дата: | 2017 |
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| Автори: | , , , , |
| Формат: | Стаття |
| Мова: | English |
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Інститут фізики конденсованих систем НАН України
2017
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| Назва видання: | Condensed Matter Physics |
| Онлайн доступ: | http://dspace.nbuv.gov.ua/handle/123456789/156554 |
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Цитувати: | Two-step percolation in aggregating systems / N. Lebovka, L. Bulavin, V. Kovalchuk, I. Melnyk, K. Repnin // Condensed Matter Physics. — 2017. — Т. 20, № 1. — С. 13602: 1–10 . — Бібліогр.: 53 назв. — англ. |
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irk-123456789-1565542019-06-19T01:28:36Z Two-step percolation in aggregating systems Lebovka, N. Bulavin, L. Kovalchuk, V. Melnyk, I. Repnin, K. The two-step percolation behavior in aggregating systems was studied both experimentally and by means of Monte Carlo (MC) simulations. In experimental studies, the electrical conductivity, σ, of colloidal suspension of multiwalled carbon nanotubes (CNTs) in decane was measured. The suspension was submitted to mechanical de-liquoring in a planar filtration-compression conductometric cell. During de-liquoring, the distance between the measuring electrodes continuously decreased and the CNT volume fraction ϕ continuously increased (from 10⁻³ up to ≈ 0.3% v/v). The two percolation thresholds at ϕ₁ . 10⁻³ and ϕ₂ ≈ 10⁻² can reflect the interpenetration of loose CNT aggregates and percolation across the compact conducting aggregates, respectively. The MC computational model accounted for the core-shell structure of conducting particles or their aggregates, the tendency of a particle for aggregation, the formation of solvation shells, and the elongated geometry of the conductometric cell. The MC studies revealed two smoothed percolation transitions in σ(ϕ) dependencies that correspond to the percolation through the shells and cores, respectively. The data demonstrated a noticeable impact of particle aggregation on anisotropy in electrical conductivityσ(ϕ) measured along different directions in the conductometric cell. Двосхiдцева перколяцiйна поведiнка в агрегованих системах була дослiджена експериментально за допомогою моделювання методом Монте Карло. В експериментальних дослiдженнях були проведенi вимiрювання електричної провiдностi, σ, колоїдних суспензiй багатошарових вуглецевих нанотрубок у деканi. Вимiрювання проводились в планарнiй фiльтрацiйнiй компресiйнiй кондуктометричнiй комiрцi при механiчному вiджиманнi рiдини з суспензiї. При вiджиманнi вiдстань мiж електродами зменшувалась, i об’ємна концентрацiя нанотрубок в ϕ в деканi збiльшувалася (вiд 10⁻³ до ≈ 0.3% v/v). Спостерiгалися два перколяцiйнi переходи при ϕ₁ . 10⁻³ i ϕ₂ ≈ 10⁻² , якi могли вiдповiдно вiдображати взаємопроникнення рихлих агрегатiв нанотрубок i перколяцiю по компактних провiдних агрегатах. Обчислювальна модель Монте Карло враховувала наявнiсть у провiдних частинок або їх агрегатiв структури типу ядро-оболонка, тенденцiю частинок до агрегацiї, утворення сольватних шарiв на поверхнi частинок i наявнiсть подовженої геометрiї кондуктометричної комiрки. Комп’ютерна модель дозволила виявити наявнiсть двох розмазаних перколяцiйних переходiв в концентрацiйних залежностях σ(ϕ), якi вiдповiдали перколяцiї по оболонках i ядрах. Спостерiгався значний вплив агрегацiї частинок на анiзотропiю електропровiдностi в рiзних напрямках кондуктометричної комiрки. 2017 Article Two-step percolation in aggregating systems / N. Lebovka, L. Bulavin, V. Kovalchuk, I. Melnyk, K. Repnin // Condensed Matter Physics. — 2017. — Т. 20, № 1. — С. 13602: 1–10 . — Бібліогр.: 53 назв. — англ. 1607-324X PACS: 61.48.De, 64.60.ah, 72.80.Tm, 73.50.-h, 73.61.-r DOI:10.5488/CMP.20.13602 arXiv:1703.10373 http://dspace.nbuv.gov.ua/handle/123456789/156554 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 |
The two-step percolation behavior in aggregating systems was studied both experimentally and by means of
Monte Carlo (MC) simulations. In experimental studies, the electrical conductivity, σ, of colloidal suspension of
multiwalled carbon nanotubes (CNTs) in decane was measured. The suspension was submitted to mechanical
de-liquoring in a planar filtration-compression conductometric cell. During de-liquoring, the distance between
the measuring electrodes continuously decreased and the CNT volume fraction ϕ continuously increased (from
10⁻³ up to ≈ 0.3% v/v). The two percolation thresholds at ϕ₁ . 10⁻³
and ϕ₂ ≈ 10⁻²
can reflect the interpenetration of loose CNT aggregates and percolation across the compact conducting aggregates, respectively. The
MC computational model accounted for the core-shell structure of conducting particles or their aggregates, the
tendency of a particle for aggregation, the formation of solvation shells, and the elongated geometry of the
conductometric cell. The MC studies revealed two smoothed percolation transitions in σ(ϕ) dependencies that
correspond to the percolation through the shells and cores, respectively. The data demonstrated a noticeable
impact of particle aggregation on anisotropy in electrical conductivityσ(ϕ) measured along different directions
in the conductometric cell. |
| format |
Article |
| author |
Lebovka, N. Bulavin, L. Kovalchuk, V. Melnyk, I. Repnin, K. |
| spellingShingle |
Lebovka, N. Bulavin, L. Kovalchuk, V. Melnyk, I. Repnin, K. Two-step percolation in aggregating systems Condensed Matter Physics |
| author_facet |
Lebovka, N. Bulavin, L. Kovalchuk, V. Melnyk, I. Repnin, K. |
| author_sort |
Lebovka, N. |
| title |
Two-step percolation in aggregating systems |
| title_short |
Two-step percolation in aggregating systems |
| title_full |
Two-step percolation in aggregating systems |
| title_fullStr |
Two-step percolation in aggregating systems |
| title_full_unstemmed |
Two-step percolation in aggregating systems |
| title_sort |
two-step percolation in aggregating systems |
| publisher |
Інститут фізики конденсованих систем НАН України |
| publishDate |
2017 |
| url |
http://dspace.nbuv.gov.ua/handle/123456789/156554 |
| citation_txt |
Two-step percolation in aggregating systems / N. Lebovka, L. Bulavin, V. Kovalchuk, I. Melnyk, K. Repnin // Condensed Matter Physics. — 2017. — Т. 20, № 1. — С. 13602: 1–10
. — Бібліогр.: 53 назв. — англ. |
| series |
Condensed Matter Physics |
| work_keys_str_mv |
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2025-07-14T08:54:32Z |
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2025-07-14T08:54:32Z |
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