Effect of stabilizer type on the physicochemical properties of poly(acrylic acid)/silver nanocomposites for biomedical applications

Abstract

Poly(acrylic acid), PAA, has been mixed in solution with silver nanoparticles, obtained by chemical reduction of silver nitrate. Two different sulfurcontaining organic compounds have been used as stabilizers of Ag nanoparticles: mercaptosuccinic acid (MSA) and 3-mercaptopropionic acid (MPA). The formation of Ag nanoparticles has been monitored by UV-Vis spectroscopy. The morphology and composition of obtained nanomaterials has been studied by electron microscopy techniques (SEM/EDX and HR-TEM). Nanomechanical properties of nanocomposites (adhesion and nanohardness) have been investigated by Atomic Force Microscopy (AFM). Thermal stability has been determined using thermogravimetric analysis. The exposure of specimens to UV radiation allowed to observe the changes in the nanoparticle structure and to estimate nanocomposite photostability. MSA has proved to be a better stabilizer of Ag nanoparticles immediately after the synthesis, when MPA provides better storage stability. MPA has allowed for the creation of nanoparticles using mixed reduction (chemical/photochemical) of AgNO 3 . It has been found that the nanocomposite materials are stable for 12 months of storage in solution and in solid form.

Homogeneous Distribution of Pt16(C4O4SH5)26 Clusters in ZIF-67 for Efficient Hydrogen Generation and Oxygen Reduction

“…In Figure 4b, the sharp weight loss around 200 °C corresponds to the removal of MSA ligands. 32,33 However, ZIF-67 is still stable up to 500 °C, which agrees well with the above SEM, TEM, and XRD results. These characterizations clearly indicate that when annealed at 300 °C, ZIF-67 can still maintain its porous structure, but the protecting ligands on the Pt NCs can be removed.…”

Influence of in situ photo-induced silver nanoparticles on the ageing of acrylate materials

“…A decrease in temperature, corresponding to the maximum rate of the first step, was observed for both the PAA/Ag before (about 264 °C) and after irradiation (about 255 °C) compared to un-doped PAA (277 °C initially and 260 °C after 25 hours of irradiation). This result emphasizes the catalytic effect of the nanofiller [20]. This effect was also responsible of the decrease of the nanohardness measured by atomic force microscopy and observed after a few tens of minutes of exposure.…”

“…The decomposition of irradiated PEGDA/PETIA films occurred in two steps: the first in the 103-293 °C range and the second at 288-421 °C. These steps were also observed in thermogravimetric analysis of poly(acrylic acid) [20]. By analogy, the first step might be attributed to the cleavage of the covalent bonds.…”

“…When poly(acrylic acid), PAA, doped with NPs was subjected to polychromatic irradiation at room temperature, a loss of the optical properties of the nanofillers was observed for an exposure time of more than 50 minutes [20]. This behavior was attributed to degradation of the polymeric matrix.…”

Structural and Optical Properties of PVP/PAA/MnO2 Nanofluid for Solar Collectors’ Systems

“…Polymers are generally used relating to their cost, high manufacturability, lightweight and chemical resistance [5]. Polyacrylic acid (PAA) is a water-soluble thermoplastic polymer with high water sorption; it has carefully been used in the numerous clinical fields [6,7]. The MnO 2 is a significant efficient metal oxide, which is scientifically attractive for fields in various applications like catalysts, ion-sieves, artificial oxidase, molecular sieves, absorbent of toxic metals, component of the dry cell, electrochemical batteries' electrodes, inorganic pigment in ceramics, and supercapacitors' electrodes [8].…”