Electrosteric stabilization of concentrated cement suspensions imparted by a strong anionic polyelectrolyte and a non-ionic polymer

2006 ◽  
Vol 36 (5) ◽  
pp. 842-850 ◽  
Author(s):  
Hyun Joon Kong ◽  
Stacy G. Bike ◽  
Victor C. Li
Keyword(s):  
Ionic Polymer ◽  
Anionic Polyelectrolyte ◽  
Electrosteric Stabilization

scholarly journals Supramolecular ionic polymer/carbon nanotube composite hydrogels with enhanced electromechanical performance

2020 ◽  
Vol 9 (1) ◽  
pp. 478-488 ◽  
Author(s):  
Yun-Fei Zhang ◽  
Fei-Peng Du ◽  
Ling Chen ◽  
Ka-Wai Yeung ◽  
Yuqing Dong ◽  
...  
Keyword(s):  
Carbon Nanotube ◽  
Ion Mobility ◽  
Artificial Muscles ◽  
Ionic Polymer ◽  
Composite Hydrogels ◽  
The Matrix ◽  
Electromechanical Performance ◽  
Carbon Nanotube Composite ◽  
Robotic Devices

AbstractElectroactive hydrogels have received increasing attention due to the possibility of being used in biomimetics, such as for soft robotics and artificial muscles. However, the applications are hindered by the poor mechanical properties and slow response time. To address these issues, in this study, supramolecular ionic polymer–carbon nanotube (SIPC) composite hydrogels were fabricated via in situ free radical polymerization. The polymer matrix consisted of carbon nanotubes (CNTs), styrene sulfonic sodium (SSNa), β-cyclodextrin (β-CD)-grafted acrylamide, and ferrocene (Fc)-grafted acrylamide, with the incorporation of SSNa serving as the ionic source. On applying an external voltage, the ions accumulate on one side of the matrix, leading to localized swelling and bending of the structure. Therefore, a controllable and reversible actuation can be achieved by changing the applied voltage. The tensile strength of the SIPC was improved by over 300%, from 12 to 49 kPa, due to the reinforcement effect of the CNTs and the supramolecular host–guest interactions between the β-CD and Fc moieties. The inclusion of CNTs not only improved the tensile properties but also enhanced the ion mobility, which lead to a faster electromechanical response. The presented electro-responsive composite hydrogel shows a high potential for the development of robotic devices and soft smart components for sensing and actuating applications.

INHIBITION OF NONSPECIFIC POLYMERASE ACTIVITY USING POLY(ASPARTIC) ACID AS A MODEL ANIONIC POLYELECTROLYTE

2021 ◽  
pp. 114267
Author(s):  
Ravil R. Garafutdinov ◽  
Assol R. Sakhabutdinova ◽  
Marat I. Kamalov ◽  
Diana V. Salakhieva ◽  
Ayrat R. Mavzyutov
Keyword(s):  
Aspartic Acid ◽  
Polymerase Activity ◽  
Anionic Polyelectrolyte

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.

Sulfonated polystyrene-based ionic polymer–metal composite (IPMC) actuator

2011 ◽  
Vol 17 (1) ◽  
pp. 49-55 ◽  
Author(s):  
Mohammad Luqman ◽  
Jang-Woo Lee ◽  
Kwang-Kil Moon ◽  
Young-Tai Yoo
Keyword(s):  
Metal Composite ◽  
Ionic Polymer Metal Composite ◽  
Sulfonated Polystyrene ◽  
Ionic Polymer ◽  
Polymer Metal
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