2014 Experimental measurements are reported of the deswelling process in presence of an external applied pressure of polyacrylamide gels at theta conditions. Analysis of the profile of the concentration gradient enables the swelling pressure as a function of concentration to be deduced as well as the collective diffusion coefficient D. To obtain an explicit expression for D, the polymer-solvent...

The aqueous reversible addition fragmentation chain-transfer (RAFT) copolymerization of isoprene and bulky comonomers, an acrylate and an acrylamide in the presence of methylated β-cyclodextrin was employed for the first time to synthesize block-copolyrotaxanes. RAFT polymerizations started from a symmetrical bifunctional trithiocarbonate and gave rise to triblock-copolymers where the outer pol...

Microgel particles and capsules which consist of multiple layers can be fabricated using droplet microfluidics, but in existing methods, emulsion templating forms layers of dissimilar polarity. In this paper, we fabricate functional microgel capsules that consist of two miscible yet distinct layers. We use microfluidic devices to template micrometer-sized drops that are loaded with prepolymeriz...

We report a methodology for labeling the GABAc receptor on the surface membrane of intact cells. This work builds upon our earlier work with serotonin-conjugated quantum dots and our studies with PEGylated quantum dots to reduce nonspecific binding. In the current approach, a PEGylated derivative of muscimol was synthesized and attached via an amide linkage to quantum dots coated in an amphiphi...

We propose a practical map representation termed rheology mapping for comprehensively evaluating the dependence of viscoelasticity on applied shear deformation and timescale represented by oscillation frequency, utilizing ultrasonic spinning rheometry, which has excellent applicability to wide variety polymer solutions. The was two typical kinds One is carboxymethyl cellulose (CMC) aqueous solu...

Abstract The purpose of the present work is to enhance thermal stability and rheological properties semi-interpenetrating polymer network (IPN) hydrogel based on partially hydrolyzed polyacrylamide/hydroxypropyl guar (HPAM/HPG) nanocomposite reinforced with graphene oxide (GO), at temperatures (200 240 °F) for use in oil recovery applications. FTIR spectra IPN hydrogels revealed interactions GO...

Polyacrylamide (PAM) is a biodegradable polymer with good lubricity in friction reduction. However, there insufficient guidance on the dosage of PAM and poor rheological information effects temperature pH. This study aimed to investigate characterization material analysis regarding concentration, pH, PAM. In characterization, has been shown offer hydrophilic surfaces. study, 1000 ppm was critic...

The effects of electrode material loading and operating temperature on solid-state electrochemical double layer capacitors (EDLCs) with Na 2 SO 4 -polyacrylamide-DMSO electrolyte were studied. Two types solid EDLC cells, using carbon nanotube (CNT) or activated (AC), very different surface areas pore structures compared to reveal the limitations in designing capacitive devices. Based gravimetri...