Single-Particle Tracking of Nonsticky and Sticky Nanoparticles in Polymer Melts
Single-Particle Tracking of Nonsticky and Sticky Nanoparticles in Polymer Melts
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聚合物熔体中非粘性和粘性纳米粒子的单粒子追踪
DOI:
10.1021/acs.macromol.0c00457
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发表时间:
2020
期刊:
影响因子:
5.5
通讯作者:
Winey, Karen I.
中科院分区:
文献类型:
--
作者:
Park, Jinseok;Bailey, Eric J.;Composto, Russell J.;Winey, Karen I.
We use single-particle tracking (SPT) to explore the role of nanoparticles/polymer interactions and polymer molecular weight on nanoparticle (NP) diffusion in unentangled polymer melts. The very dilute NP concentrations (∼10–7wt %) in SPT measurements enable tuning NP/polymer interactions so that the systems with unfavorable or neutral NP/polymer interactions in polymer melts can be studied without nanoparticle aggregation. Here, the diffusion coefficients of weakly interacting (methyl-capped, CH3QDs) and strongly interacting (carboxylic acid-capped, COOH QDs) nanoparticles (radius = 6.6 nm) in poly(propylene glycol) (PPG) melts were measured via SPT. Mean-squared displacements and van Hove distributions of nanoparticle motion are consistent with Brownian motion of single nanoparticles in the long-time diffusion regime. The effective COOH QD size increases with PPG molecular weight asMw0.5, indicating a long-lived bound layer. However, for weakly interacting CH3QDs, the effective nanoparticle radius is independent of PPGMwdue to the absence of a bound layer. In contrast to ensemble average methods (i.e., X-ray photon correlation spectroscopy), SPT methods directly detect spatial and temporal diffusion behavior of individual nanoparticles and provide previously inaccessible information about nanoparticle diffusion in polymer melts.
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DOI:
10.1021/acs.langmuir.7b03418
发表时间:
2018-01
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
作者:
Pooja Nath;R. Mangal;Ferdinand F. E. Kohle;Snehashis Choudhury;S. Narayanan;Ulrich B Wiesner;L. Archer
通讯作者:
Pooja Nath;R. Mangal;Ferdinand F. E. Kohle;Snehashis Choudhury;S. Narayanan;Ulrich B Wiesner;L. Archer
影响因子:
5.5
作者:
Cai LH;Panyukov S;Rubinstein M
通讯作者:
Rubinstein M
影响因子:
5.5
作者:
E. Bailey;Philip J. Griffin;R. Composto;K. Winey
通讯作者:
E. Bailey;Philip J. Griffin;R. Composto;K. Winey
DOI:
--
发表时间:
2014
期刊:
影响因子:
--
作者:
Woo;P. Koo;K. Bryson;S. Narayanan;A. Sandy;T. Russell;S. Mochrie
通讯作者:
S. Mochrie