In situ characterization of silver nanoparticle synthesis in maltodextrin supramolecular structures

Abstract

The use of maltodextrin supramolecular structures (MD SMS) as a reducing agent and colloidal stabilizing agent for the synthesis of Ag nanoparticles (Ag NPs) identified three key points. First, the maltodextrin (MD) solutions are effective in the formation of well-dispersed Ag NPs utilizing alkaline solution conditions, with the resulting Ag NPs ranging in size from 5 to 50 nm diameter. Second, in situ characterization by Raman spectroscopy and small angle X-ray scattering (SAXS) are consistent with initial nucleation of Ag NPs within the MD SMS up to a critical size of ca. 1 nm, followed by a transition to more rapid growth by aggregation and fusion between MD SMS, similar to micelle aggregation reactions. Third, the stabilization of larger Ag NPs by adsorbed MD SMS is similar to hemi-micelle stabilization, and monomodal size distributions are proposed to relate to integer surface coverage of the Ag NPs. Conditions were identified for preparing Ag NPs with monomodal distributions centered at 30-35 nm Ag NPs.

A green in situ synthesis of silver nanoparticles on cotton fabrics using Aloe vera leaf extraction for durable ultraviolet protection and antibacterial activity

“…15 Moreover, the polysaccharide biopolymers from plant leaf extraction, such as maltodextrin and crosslinked 3D guar gum networks, can replace chemical agents such as sodium borohydride, and can be applied as both reducing agent and stabilizing agent to produce highly effective and stable AgNPs. 16,17…”

In Situ Synthesis of Silver Nanoparticles on Flame-Retardant Cotton Textiles Treated with Biological Phytic Acid and Antibacterial Activity

“…Green reduction is one of these strategies that has received much attention. Plant-derived polysaccharides (e.g., maltodextrin and guar gum) can be employed as a reducing agent and stabilizer in the synthesis of Ag NPs [ 14 , 15 ]. Logeswari [ 16 ] et al used five plant extracts to synthesize Ag NPs of varying sizes, and these Ag NPs showed outstanding antibacterial capabilities against harmful bacteria.…”