Synthesis of silver nanoparticles in DMSO solutions of starch: a comparative investigation of native and soluble starches

Abstract

Silver nanoparticles (AgNPs) were synthesized in solutions of native and soluble starches in DMSO for the first time. The starches acted as reducing and stabilizing agents simultaneously. The kinetics of the process and its activation energy were determined by using UV-vis spectroscopy. The DMSO solution of soluble starch was characterized by better reductive activity than the native starch solution. The morphology and dispersion characteristics of AgNPs sols were evaluated from transmission electron microscopy (TEM). Sols, including spherical particles with mean diameter (D m ) 42.8 nm and metal rod-like particles, were obtained by using the native starch solution. Morphologically uniform sols of spherical AgNPs with D m =37.2 nm were formed in the soluble starch solution. On the basis of zeta potential measurements, it was shown that the stability of a AgNPs dispersion in the soluble starch solution was higher in comparison to the native starch solution.

Solvent based fractional biosynthesis, phytochemical analysis, and biological activity of silver nanoparticles obtained from the extract of Salvia moorcroftiana

“…With the increase in the size of nanoparticles, the absorbance intensity decreases [ 32 ] as observed with Aq-Ag-NPs when compared with D-Ag-NPs. Kochkina and Skobeleva [ 33 ] synthesized Ag-NPs from the reaction of starches dissolved in DMSO with AgNO 3 and observed the surface plasmon band maximum at 418 nm. The absorption bands of Aq*-Ag-NPs (λ (max) = 414 nm) and D*-Ag-NPs (λ (max) = 472 nm) within the characteristic range confirms their presence.…”

Revisiting preparation routes of SERS materials

“…Small peaks at 1300-1550 cm −1 are most probably related to amide bonds forming between silver and residual ammonia. The peaks near 3000 cm −1 seem to be attributed to hydrogen bonds in water absorbed with aggregated structure of silver nanoparticles [20]. For example, an application of hydroxyethylcellulose, swelling in both hydrophilic and hydrophobic environment, combined with the Series I samples, gives a small worsening of the background signal mostly because of hydrogen bonds associated with residual water.…”

Physical and chemical characterization of natural and modified nanoclays and their ecotoxicity on a freshwater algae species (Chlamydomonas reinhardtii)

“…We used dynamic light scattering (DLS; Malvern Instruments Zetasizer Nano ZS) to estimate the zeta potential of each nanoclay in TAP medium. Although not a direct measure of particle stability (i.e., the likelihood that particles remain as single particles rather than aggregate when placed in solution), larger zeta potential estimates are commonly interpreted in the literature as indicative of particles with higher stability (Bhattacharjee ); especially when the zeta potential exceeds 25 mV (Kochkina et al ). The ideal concentration at which to assess zeta potential depends on several factors, and it is recommended that zeta potential be assessed at multiple concentrations to determine which concentration provides good (high signal‐to‐noise ratio) zeta potential estimates (Malvern Instruments ; Bhattacharjee ).…”