Synthesis and characterisation of biocompatible organic–inorganic core–shell nanocomposite particles based on ureasils

Abstract

A one-pot route to ureasil core–shell nanoparticles that exhibit low polydispersity, high stability and low cytotoxicity is reported.

Ultra‐Small Air‐Stable Triplet‐Triplet Annihilation Upconversion Nanoparticles for Anti‐Stokes Time‐Resolved Imaging

“…This indicates that both the absorbance and scattering of the host ureasil NPs are negligible compared to the absorbance of DPA at this concentration. The fluorescence spectrum of the dilute DPA@ureasil NPs (obtained upon direct excitation of DPA at 355 nm) is also comparable to the DPA ethanolic solution, confirming that the any host emission is negligible [56] . While the absorption and emission spectra of the dilute DPA@ureasil NPs are slightly red‐shifted (≈5 nm) compared to the DPA ethanolic solution, the measured photoluminescence quantum yield (PLQY) is 99±3% for DPA@ureasil, which is comparable to literature reports (97 % in cyclohexane) [60] …”

“…drug delivery, [50,51] luminescent solar concentrators, [52,53] visible light communications, [54] electrochromic displays), [55] our group has recently reported a precipitation approach for synthesis of fluorescent ureasil NPs (hydrodynamic diameter, D h � 150 nm) for the first time. [56] The ureasil NPs showed excellent compatibility with embedded organic luminophores, high stability in aqueous dispersions and low biotoxicity. Here, we report a new route to synthesise ultra-small ( � 6 nm) ureasil NPs using emulsion polymerisation, with the goal of improving cell permeability by reducing the particle size.…”

“…While bulk ureasil materials have been extensively studied for their properties [45–49] and applications (e.g. drug delivery, [50,51] luminescent solar concentrators, [52,53] visible light communications, [54] electrochromic displays), [55] our group has recently reported a precipitation approach for synthesis of fluorescent ureasil NPs (hydrodynamic diameter, D h ≈150 nm) for the first time [56] . The ureasil NPs showed excellent compatibility with embedded organic luminophores, high stability in aqueous dispersions and low biotoxicity.…”

Smart Optical Sensors for Internet of Things: Integration of Temperature Monitoring and Customized Security Physical Unclonable Functions

“…The selected luminescent materials are based on organic-inorganic hybrid (di-ureasils) inks prepared at room temperature with tunable optical and structural properties [24] . Regarding biocompatibility, di-ureasils have been addressed as biocompatible materials in recent literature [27]. The possibility of incorporating lanthanide (e.g., Ln 3+ =Eu 3+ ) complexes comprising suitable ligands provides pure color emission (full-width-at-half-maximum, fwhm<4 nm) in the visible spectral regions.…”

Preparation of Microwave Multi-Adsorbent Nanocomposites Based on Copper, Iron Carbonyl, Carbon Nanofiber, Graphite Nanoflake and Polypyrrole

“…In addition to absorbing electromagnetic waves, polypyrrole and epoxy nanocomposites also increase enhanced flame retardancy in the presence of nanomagnetite [10]. On the other hand, nanocomposites with shell core structure have been extensively developed and have several applications [11,12]. The conductive and magnetic nanocomposites with core-shell and different nanostructures were used for electromagnetic absorption application [13,14].…”