Репозиторий Университета

© 2019 Nanodiamonds (ND) are one of the most attractive carbon materials for nanotechnology. The impregnation of NDs into the polymer capsule shell in the form of the single nanoparticles insures the control over the thermal conductivity of the capsule shell and increases their sensitivity to the external microwave irradiation. The polymer shell of the polyelectrolyte capsules was modified with NDs by electrostatic adsorption technique. The sensitivity of the capsules with embedded NDs to the external microwave irradiation was demonstrated by scanning electron microscopy leading to the shell rupture and release of the encapsulated agents.

© 2018 Elsevier B.V. Aiming to explore elevated temperatures as a tool for miniaturization of biodegradable polymer multilayer capsules, assembled on spherical vaterite micron- and submicron-sized particles, we subject the shells composed of dextran sulfate (DS) and poly-L-arginine (Parg) to a heat treatment. Changes of the capsule size are studied at various temperatures and ionic strengths of the continuous phase. Unlike some synthetic polymer multilayer shells (their response to heat treatment depends on the number of layers and their arrangement), the biodegradable Parg/DS capsules exhibit size reduction and profound compaction regardless of their initial size, number of polymer layers and polymer layer sequence. The capsule response to heat is stable at ionic strengths of the continuous phase not exceeding 0.1 M NaCl.