scholarly journals Review 2: Nanoparticle Interactions and Molecular Relaxation in PLA/PBAT/Nanoclay Blends

2020 ◽  
Author(s):  
Reza Salehiyan
Keyword(s):  
Molecular Relaxation ◽  
Nanoparticle Interactions

scholarly journals Nanoparticle Interactions and Molecular Relaxation in PLA/PBAT/Nanoclay Blends

2020 ◽  
Vol 1 ◽  
Author(s):  
M. Nofar ◽  
M.-C. Heuzey ◽  
P.J. Carreau ◽  
M.R. Kamal
Keyword(s):  
Small Amplitude ◽  
Relaxation Behavior ◽  
Molecular Relaxation ◽  
Stress Growth ◽  
Small Amplitude Oscillatory Shear ◽  
Clay Nanoparticles ◽  
Modified Clay ◽  
Nanoparticle Interactions ◽  
Before And After ◽  
Spectra Properties

AbstractOrgano-modified clay nanoparticles were mixed at 1 and 5 wt% concentrations with a molten blend of 75 wt% of polylactide (PLA) and 25 wt% poly[(butylene adipate)-co-terephthalate] (PBAT). Three mixing strategies were used to control the localization of nanoclay. Small amplitude oscillatory shear (SAOS) and stress growth tests were conducted to clarify the nanoclay interactions with the blend components and its effect on the molecular relaxation behavior. SAOS and weighted relaxation spectra properties were determined before and after pre-shearing at a rate of 0.01 s−1. Molecular relaxation and its characteristics were influenced by PLA degradation, PBAT droplet coalescence, and nanoclay localization.

scholarly journals Single-shot imaging of surface molecular ionization in nanosystems

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Fenghao Sun ◽  
Hui Li ◽  
Shanshan Song ◽  
Fei Chen ◽  
Jiawei Wang ◽  
...  
Keyword(s):  
Near Infrared ◽  
Strong Field ◽  
Imaging Technique ◽  
Near Field ◽  
Velocity Map Imaging ◽  
Single Shot ◽  
Surface Molecules ◽  
Nanoparticle Interactions ◽  
Field Response ◽  
Ion Species

Abstract Using single-shot velocity map imaging technique, explosion imaging of different ion species ejected from 50 nm SiO2 nanoparticles are obtained excitedly by strong near-infrared and ultraviolet femtosecond laser fields. Characteristic momentum distributions showing forward emission of the ions at low excitation intensities and shock wave behaviors at high intensities are observed. When the excitation intensity is close to the dissociative ionization threshold of the surface molecules, the resulting ion products can be used to image the instant near-field distributions. The underlying dynamics of shock formation are simulated by using a Coulomb explosion model. Our results allow one to distinguish the ultrafast strong-field response of various molecular species in nanosystems and will open a new way for further exploration of the underlying dynamics of laser-and-nanoparticle interactions.

scholarly journals Physical networks from entropy-driven non-covalent interactions

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Anthony C. Yu ◽  
Huada Lian ◽  
Xian Kong ◽  
Hector Lopez Hernandez ◽  
Jian Qin ◽  
...  
Keyword(s):  
Elevated Temperatures ◽  
Dissociation Rate ◽  
Mathematical Framework ◽  
Temperature Dependent ◽  
Nanoparticle Interactions ◽  
Temperature Superposition ◽  
Non Covalent Interactions ◽  
Time Temperature Superposition ◽  
Covalent Interactions ◽  
Physical Crosslinking

AbstractPhysical networks typically employ enthalpy-dominated crosslinking interactions that become more dynamic at elevated temperatures, leading to network softening. Moreover, standard mathematical frameworks such as time-temperature superposition assume network softening and faster dynamics at elevated temperatures. Yet, deriving a mathematical framework connecting the crosslinking thermodynamics to the temperature-dependent viscoelasticity of physical networks suggests the possibility for entropy-driven crosslinking interactions to provide alternative temperature dependencies. This framework illustrates that temperature negligibly affects crosslink density in reported systems, but drastically influences crosslink dynamics. While the dissociation rate of enthalpy-driven crosslinks is accelerated at elevated temperatures, the dissociation rate of entropy-driven crosslinks is negligibly affected or even slowed under these conditions. Here we report an entropy-driven physical network based on polymer-nanoparticle interactions that exhibits mechanical properties that are invariant with temperature. These studies provide a foundation for designing and characterizing entropy-driven physical crosslinking motifs and demonstrate how these physical networks access thermal properties that are not observed in current physical networks.

Studies of molecular relaxation by infrared and microwave coherent transients

1980 ◽  
Vol 21 (1) ◽  
pp. 29-34 ◽  
Author(s):  
T. Shimizu ◽  
N. Morita ◽  
T. Kasuga ◽  
H. Sasada ◽  
F. Matsushima ◽  
...  
Keyword(s):  
Molecular Relaxation

Infrared dichroism measurements of molecular relaxation in binary blend melt rheology

1989 ◽  
Vol 22 (3) ◽  
pp. 1334-1345 ◽  
Author(s):  
Julia A. Kornfield ◽  
Gerald G. Fuller ◽  
Dale S. Pearson
Keyword(s):  
Melt Rheology ◽  
Molecular Relaxation ◽  
Binary Blend ◽  
Infrared Dichroism

QCM-D study of nanoparticle interactions

2016 ◽  
Vol 233 ◽  
pp. 94-114 ◽  
Author(s):  
Qian Chen ◽  
Shengming Xu ◽  
Qingxia Liu ◽  
Jacob Masliyah ◽  
Zhenghe Xu
Keyword(s):  
Nanoparticle Interactions
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