scholarly journals Gelation and yielding behavior of polymer–nanoparticle hydrogels

2021 ◽  
Author(s):  
Abigail K. Grosskopf ◽  
Olivia A. Saouaf ◽  
Hector Lopez Hernandez ◽  
Eric A. Appel
Keyword(s):  
Polymer Nanoparticle ◽  
Yielding Behavior

scholarly journals Gelation and Yielding Behavior of Polymer-Nanoparticle Hydrogels

2021 ◽  
Author(s):  
Abigail Grosskopf ◽  
Olivia Saouaf ◽  
Hector Lopez Hernandez ◽  
Eric Appel
Keyword(s):  
Yield Stress ◽  
Structural Dynamics ◽  
Shear Thinning ◽  
Solution Viscosity ◽  
Potential Utility ◽  
Polymer Nanoparticle ◽  
Diffusion Studies ◽  
Yielding Behavior ◽  
Stress Behaviors ◽  
And Diffusion

Polymer-Nanoparticle hydrogels are a unique class of self-assembled, shear-thinning, yield-stress fluids which have demonstrated potential utility in many impactful applications. Here we present a thorough analysis of the gelation and yielding behavior of these materials with respect to the polymer and nanoparticle component stoichiometry. Through comprehensive rheological and diffusion studies, we reveal insights into the structural dynamics of the polymer nanoparticle network which identify that stoichiometry plays a key role in gelation and yielding, ultimately enabling the development of hydrogel formulations with unique shear-thinning and yield-stress behaviors. Access to these materials opens new doors for interest- ing applications in a variety of fields including tissue engineering, drug delivery, and controlled solution viscosity.

scholarly journals Gelation and Yielding Behavior of Polymer-Nanoparticle Hydrogels

2021 ◽  
Author(s):  
Abigail Grosskopf ◽  
Olivia Saouaf ◽  
Hector Lopez Hernandez ◽  
Eric Appel
Keyword(s):  
Polymer Nanoparticle ◽  
Yielding Behavior

scholarly journals Electrochemiluminescence Enhancement and Particle Structure Stabilization of Polymer Nanoparticle by Doping Anionic Polyelectrolyte and Cationic Polymer Containing Tertiary Amine Groups and Its Highly Sensitive Immunoanalysis

Processes ◽  
2020 ◽  
Vol 8 (9) ◽  
pp. 1054
Author(s):  
Noor Ul Ain ◽  
Tian-Yu Wang ◽  
Xiao-Ning Wu ◽  
Tong-Hong Wei ◽  
Jing-Shuo Zhang ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Tertiary Amine ◽  
Hepatitis B Surface Antigen ◽  
Particle Diameter ◽  
Cationic Polymer ◽  
Suspension Stability ◽  
Good Precision ◽  
Polymer Nanoparticle ◽  
Anionic Polyelectrolyte ◽  
Amine Groups

A doped polymer nanoparticle (dPNP) of electrochemiluminescence (ECL) was prepared via doping the anionic polyelectrolyte polyacrylic acid (PAA) and the cationic polymer poly-ethyleneimine (PEI) into the polymer nanoparticle (PNP), which was self-assembled by Ru(bpy)32+ derivative-grafted PAA (PAA–Ru) with both cations and anions. The good electrical conductivity of the doped polyelectrolyte PAA enhanced the ECL intensity of PNP to 109.1%, and the involvement of a large number of tertiary amine groups of the doped PEI further enhanced that to 127.3%; meanwhile, doping low-molecular-weight PEI into PNP, while simultaneously doping high-molecular-weight PAA, avoided the precipitation of PAA and PEI, due to interaction of the two oppositely charged polymers; and these also made the self-assembly procedure more effective and the nanoparticle structure more stable than PNP and also led to the production of rich residual PAA chains on the surface of dPNP. The storage results showed that the average hydrated particle diameter kept almost constant (197.5–213.1 nm) during 15-day storage and that the nanoparticles have rich surface charge of −11.47 mV (zeta potential), well suspension stability and good dispersity without detectable aggregation in the solution during the storage. Therefore, the nanoparticle is quite suitable for the antibody labeling, immunoassay and the storage. As a result, a high-sensitive ECL immunoassay approach with good precision, accuracy and selectivity was established and an ultra-low detection limit of 0.049 pg mL−1 (S/N = 3) for magnetic bead-based detection of Hepatitis B surface antigen was observed.

Investigating yielding behavior of heterogeneous vehicles at a semi-controlled crosswalk

2021 ◽  
Vol 161 ◽  
pp. 106381
Author(s):  
Yongjie Wang ◽  
Qian Su ◽  
Chao Wang ◽  
Carlo G. Prato
Keyword(s):  
Yielding Behavior
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