Synthesis of Silver Nanoparticles for Remote Opening of Polyelectrolyte Microcapsules

Abstract

Silver nanoparticles of 10, 18, and 23 nm were synthesized in aqueous medium by chemical reduction of silver nitrate in excess of sodium borohydride. Modification of polyelectrolyte shells with synthesized silver nanoparticles was performed using the layer-by-layer approach. Remote opening of the polyelectrolyte/silver capsules was performed with a CW Nd:YAG FD laser with an average incident power output up to 70 mW. Capsules with a mixture of 10 and 18 nm silver nanoparticles in its polyelectrolyte shell were ruptured after less than 7 s of laser irradiation, while microcapsules with 23 nm silver nanoparticles in the shell were broken after 11 s of laser treatment and 10 nm silver nanoparticles were broken after 26 s.

To prepared fluorescent chitosan capsules by in situ polyelectrolyte coacervation on poly(methacrylic acid)-doped porous calcium carbonate microparticles

“…Recently hollow spheres and capsules have been introduced as a novel type of nanoengineered multifunctional material [1,2]. Permeability as a function of the wall materials of the microcapsules has received considerable attention due to an increased interest in biotechnology, medicine, catalysis, environment, food, etc., especially in the field of drug delivery [3][4][5].…”

A facile route to synthesize silver nanoparticles in polyelectrolyte capsules

“…Thermal pulses activate the thermo responsive hydrogels to release their contents [9], while in the case of magnetic triggering, the applied magnetic field disrupts the microcapsules that contain magnetically sensitive nanoparticles [10]. Laser light based optical triggering presents another mechanism for manipulation of delivery systems [11]. The presence of inorganic nanoparticles, especially silver/gold nanoparticles, significantly improves the efficiency of the radiation-stimulated release in near-infrared (NIR) region [11,12], which is particularly attractive in biomedical applications due to weak absorption of NIR radiation by most tissues.…”

“…Laser light based optical triggering presents another mechanism for manipulation of delivery systems [11]. The presence of inorganic nanoparticles, especially silver/gold nanoparticles, significantly improves the efficiency of the radiation-stimulated release in near-infrared (NIR) region [11,12], which is particularly attractive in biomedical applications due to weak absorption of NIR radiation by most tissues.…”

A Simple and “Green” Method for Synthesis of Magnetic Hollow Silica Spheres and Its <sup>99</sup>Tc<sup>m</sup> Labeled Targeting Studies

“…One is that the inner and outer walls of the hollow microspheres are functionalized. For example, Darya Radziuk reported the synthesis of silver nanoparticles for remote opening of polyelectrolyte microcapsules [16]. The other is that functional microspheres are placed in the cavity of the hollow microspheres.…”