Dual Role of a Ricinoleic Acid Derivative in the Aqueous Synthesis of Silver Nanoparticles

Abstract

We show that sodium 9,10-epoxy-12-hydroxytetradecanoate (SEAR), an epoxidized derivative of ricinoleic acid, simultaneously functioned as reducing and stabilizing agents in the synthesis of silver nanoparticles in alkaline aqueous medium. The advantage of using SEAR is its biodegradability and nontoxicity, which are important characteristics for mitigation of environmental impact upon discharge of nanoparticles into terrestrial and aquatic ecosystems. The SEAR concentration was found to impact considerably the size distribution of silver nanoparticles (AgNPs). A concentration below the SEAR critical micelle concentration (CMC) generated 23 nm sized AgNPs with 10 nm standard deviation, while 50 nm sized AgNPs ( = 21 nm) were obtained at a concentration above the SEAR CMC. FTIR analysis revealed that the carboxylate that constitutes the SEAR hydrophilic head binds directly to the AgNPs surface promoting stabilization in solution. Finally, AgNPs turned into Ag 2 S upon contact with wastewater samples from Wastewater Treatment Plant at Federal University of Rio Grande do Norte (UFRN), Brazil, which is an interesting result, since Ag 2 S is more environmentally friendly than pure AgNPs.

Silver/Graphene Oxide Nanostructured Coatings for Modulating the Microbial Susceptibility of Fixation Devices Used in Knee Surgery

“…In addition, the thermal analysis revealed an increased amount of sodium stearate molecules (>60%) conjugated on the surface of nanosilver particles (Figure 1c). In terms of microstructure, and given the selection of a mild reducing agent and a long-chain stabilizing agent, our finding are consistent with previous studies regarding the fabrication of fatty acid-capped (@C 18 ) nanosilver [72,73].…”

Role of Biogenic Capping Agents in the Synthesis of Metallic Nanoparticles and Evaluation of Their Therapeutic Potential

“…The concentration of SEAR was found to be an important factor contributing to the size of nanoparticles. Concentrations below the critical micelle concentration (CMC) of SEAR produced AgNPs of 23 nm in size with a standard deviation of 10 nm, whereas AgNPs of 50 nm (σ = 21 nm) were obtained at a concentration of above SEAR CMC (Costa et al, 2017). Table 1 illustrates the various biogenic capping agents (proteins, amino acids, carbohydrates, and lipids) in the synthesis of nanoparticles.…”

Role of Honey as a Bifunctional Reducing and Capping/Stabilizing Agent: Application for Silver and Zinc Oxide Nanoparticles

“…The versatility of Ag-NPs and zinc oxide NPs (ZnO-NPs) in rendering themselves to many applications, including in sensors [ 58 ], renewable energies [ 59 ], environmental remediation [ 60 ], bio-therapeutic devices [ 61 ], clothing [ 62 ], antimicrobial [ 63 ] is currently being explored. This is due to the unique properties of their small size and high surface area-to-volume ratio, which enhances their physical, biological, and chemical characteristics compared to those of their bulk counterparts.…”