Deposition of silver nanoparticles on organically-modified silica in the presence of lignosulfonate

Abstract

It is shown that the chemical reduction of silver ions by lignosulfonate (LS) in a mixed aqueous-organic solvent produces silver nanoparticles (AgNPs). If, additionally, spherical silica (SiO 2 ) (surfacefunctionalized with various organic groups) is introduced to the reaction mixture, the LS-stabilized Ag-NPs are deposited on the surface of the silica spheres, forming a SiO 2 -LS-AgNPs hybrid material. The efficiency of the process is found to depend significantly on both the polarity of the organic solvent and the hydrophobicity of the SiO 2 -grafted functionalities. The most effective synthesis was in a mixed dimethylformamide-water solvent with octadecylsilane-functionalized SiO 2 . It is concluded that hydrophobic forces are essential for the successful coupling of LS-AgNPs with the surface of the modified silica. The formation of LS-AgNPs was monitored by UV-Vis spectroscopy, and the properties of the final hybrid materials were determined by EDS, elemental analysis, NIBS, TGA colorimetric analysis and HRTEM techniques. The resulting SiO 2 -LS-AgNPs hybrids were also used as SERS substrates with Rhodamine 6G as a test molecule.

Safed Musli (Chlorophytum borivilianum L.) Callus-Mediated Biosynthesis of Silver Nanoparticles and Evaluation of their Antimicrobial Activity and Cytotoxicity against Human Colon Cancer Cells

“…There are several approaches to synthesize AgNPs, including chemical, physical, and biological methods [3,[9][10][11]. However, the preferred method is by using the biological route that involves plant compounds or plant extracts, microbes, or their products.…”

Silica nanocomposites based on silver nanoparticles-functionalization and pH effect

“…Functionalization of the support surface is often a precondition for many potential applications when the interactions between components can affect the stability of nanoparticles and colloids (Haddada et al 2013;Milczarek et al 2014). Surface functionalization of the most useful matrixes leads to incorporation of the active groups on the external layers and thus formation of the active sites with affinity to bind other molecules, biomolecules, and noble metal nanoparticles.…”

Influence of Processing Conditions on the Thermal Stability and Mechanical Properties of PP/Silica-Lignin Composites

“…Currently, it is important for economic and environmental reasons to use natural polymers as organic precursors that are derived from broadly defined biomasses or other sources. Particularly, noteworthy are the systems with silica, which represents a popular, relatively inexpensive inorganic filler or support, and biopolymers, for example, lignin [1][2][3] and its derivatives, including lignosulfonates [4,5].…”