An inexpensive one-pot route to self-healing hydrogels with pH-tunable modulus is presented. Hydrogels were formed by reacting tannic acid, trivalent metal ions and polyallylamine. Below pH 8 the hydrogels were supramolecular while above, covalent cross-linking strengthened the hydrogels. From concentrated mixtures, threads were spun, acting as water sensitive mechanical locks.

We describe a facile and high-recovery material for rare metals based on a polymer combining amino groups for water solubility and thiourea groups for metal complexation. Good solubility in aqueous metal ion solutions allows for homogeneous and efficient adsorption by the polymer, and a maximum Pd(II) recovery amount (0.508 gPd gpolymer(-1)) greater than those of other polymers reported in the ...

A novel cellulose-based resin functionalized with polyallylamine was synthesized. It was applied to the collection of phosphate in environmental water samples, followed by concentration determination using an inductively coupled plasma-atomic emission spectrometer (ICP/AES). The synthesized resin, cellulose-glycidylmethacrylate-polyallylamine (CGP), showed good adsorption behavior toward trace ...

objective(s): although viral vectors are considered efficient gene transfer agents, their board application has been limited by toxicity, immunogenicity, mutagenicity and small gene carrying capacity. non-viral vectors are safe but they suffer from low transfection efficiency. in the present study, polyallylamine (paa) in two molecular weights (15 and 65 kda) was modified by alkane derivatives ...

Utilizing Layer-by-Layer (LbL) assembly, a fabrication method for the controlled creation of porous structures on Polyallylamine Hydrochloride (PAH) and Polyacrylic Acid (PAA) coatings was developed. These LbL coatings, generated through an acid corrosion process, resulted in formation distinctive structures. Experimental parameters, specifically temperature gradients from ambient to 60°C, imme...