Preparation of modified sodium lignosulfonate hydrogel–silver nanocomposites

Abstract

In this article, modified sodium lignosulfonate (MSLS) hydrogel particles were prepared using sodium lignosulfonate as starting material. The hydrogel particles exhibit a reversible property transformed between the two states of macrohydrogel and microhydrogel by ultrasonic dispersion and vacuum drying. Using this property, highly stable and uniformly dispersed silver nanoparticles (AgNPs) have been prepared via in situ reduction of silver ions (silver nitrate) in the microhydrogel aqueous dispersion with sodium borhydride. The hybrid microhydrogel with AgNPs was transformed into MSLS hydrogel-silver nanocomposites by drying under vacuum at 408C. X-ray diffraction, ultravioletvisible (UV-vis) spectrophotometry, Fourier transform infrared spectra, atomic absorption spectroscopy, transmission electron microscopy, and scanning electron microscopy were used to characterize the composite system. The results show that the size of spherical silver nanoparticles incorporated in the hydrogel framework is about 10 nm. POLYM. COMPOS., 34:860-866, 2013. ª

Design of super‐tough and antibacterialPPR/nano‐ZnOcomposites based on the excellent dispersion ofZnOparticles

“…This phenomenon shows that heterogenous nucleation, which needs a higher temperature, was occurred in PZ. This similar effect has been previously reported 44 , which indicated that ZnO particles were acted as nucleation agents to guide the crystallization of PPR to a higher temperature. Surely, ZnO particles still had the ability to induce heterogenous nucleation and crystallization in PVZ3.…”

“…where ΔH m and ΔH c are the enthalpies of melting and cold crystallization during heating, respectively; ΔH m 0 is the enthalpy assuming 100% crystalline PPR homopolymer (209 J/g); 14,44 and Φ is the weight fraction of PPR component in the sample. It should be noted that all samples have no cold crystallization peak, so the ΔH c value is 0.…”

Facile preparation of in situ coated Ti3C2Tx/Ni0.5Zn0.5Fe2O4composites and their electromagnetic performance

“…31 The -CH 2 (2920 cm À1 ), -C]C-(1560 cm À1 ), aromatic ring (1508 cm À1 ), C-H (1458 cm À1 ) group, and C-O (1120 cm À1 ) were present in the spectra of SLS-Ti 3 C 2 . 14,32 Lignin sulfonic is an amphoteric hydrophilic polymer surfactant with both carbon chains, phenolic hydroxyl hydrophobic group and hydrophilic group of sulfonic acid. Under the effect of van der Waals forces and steric hindrance effects, the hydrophobic group improved the dispersion of Ti 3 C 2 T x MXenes in water, and the hydrophilic group stretched in the aqueous solution and provided a nucleation channel for the in situ coated and intercalated NiZn ferrite.…”

Mechanical Properties of Silicone Rubber Enhanced Microcellular EPDM Foams Based on Supercritical CO2Foaming Technology

“…Some literatures report that the introduction of nanoparticles can reduce the domain size of the dispersed phase and improve the compatibility of the blends. [ 24–27 ] Especially, Yu et al. [ 24 ] found that the hydrophobic silica can improve the interfacial adhesion between poly(lactic acid) (PLA) and TPU through hydrogen bonding.…”