5 research outputs found
Comparison of the resolving power of metric and non-metric cranial characters in defining geographical populations of dolphins
Volume: 447Start Page: 1End Page: 1
One-Step Synthesis of Functional Sulfonated Polynaphthoylenebenzimidazoles for Biosensing Applications
Polynaphthoylenebenzimidazoles containing functional sulfo groups were synthesized by a one-step method in a sulfuric acid medium with oleum. A polymer-analogous transformation of these polymers with aqueous solutions of metal salts (K, Ca, and Cr) was carried out. Their chemical structure was characterized by FTIR, NMR, and elemental analysis. Polymer salt coatings were deposited on QCM sensor surfaces by electron beam-induced vacuum deposition. The morphology of the coatings was characterized by AFM. It was shown that the coatings formed from a series of polymer salts have different adsorption activity in acetaminophen–water solution compared to distilled water. The QCM results indicate that sensor signal correlates with polymer coating thickness, morphology, and its chemical composition
Polymer Surface Engineering for Efficient Printing of Highly Conductive Metal Nanoparticle Inks
An approach to polymer surface modification
using self-assembled
layers (SALs) of functional alkoxysilanes has been developed in order
to improve the printability of silver nanoparticle inks and enhance
adhesion between the metal conducting layer and the flexible polymer
substrate. The SALs have been fully characterized by AFM, XPS, and
WCA, and the resulting printability, adhesion, and electrical conductivity
of the screen-printed metal contacts have been estimated by cross-cut
tape test and 4-point probe measurements. It was shown that (3-mercaptopropyl)Âtrimethoxysilane
SALs enable significant adhesion improvements for both aqueous- and
organic-based silver inks, approaching nearly 100% for PEN and PDMS
substrates while exhibiting relatively low sheet resistance up to
0.1 Ω/sq. It was demonstrated that SALs containing functional
−SH or −NH<sub>2</sub> end groups offer the opportunity
to increase the affinity of the polymer substrates to silver inks
and thus to achieve efficient patterning of highly conductive structures
on flexible and stretchable substrates