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Light-Triggered Reversible Self-Engulfing of Janus Nanoparticles
摘要： Block copolymers containing azobenzene liquid crystalline (LC) mesogen are used to prepare snowman-like Janus nanoparticles (NPs) by emulsion solvent evaporation. The azobenzene-containing poly(methacrylate) (PMAAz) head of the Janus NPs is in the smectic LC phase with ordered stripes, which becomes amorphous and enlarged due to trans/cis transformation under UV irradiation. The expanded PMAAz can consequently engulf the other head. The self-engulfed NPs can recover to their original state in both shape and LC state via visible-light irradiation. This strategy is promising for programmable load and release of different payloads by remote trigger using light.
关键词： emulsion solvent evaporation,azobenzene,liquid crystalline,Block copolymers,Janus nanoparticles,programmable load and release,UV irradiation,visible-light irradiation
更新于2025-09-23 15:21:01
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Janus shaped plasmonic-magnetic silver-magnetite nanostructures for multimodal applications
摘要： The multifunctional biocompatible Janus shaped plasmonic-magnetic silver-magnetite nanoparticles have been developed via a single phase microemulsion technique and investigated for different physical properties. The noble metal integration with magnetite nanoparticles introduces superior optical properties into the nanostructures. The dynamic light scattering technique has been used to measure the hydrodynamic size, monodispersity and zeta potential to check their suitability as multimodal agents. The synthesized silver-magnetite nanoparticles are monodispersed and possess colloidal stability. The UV–visible spectra for Janus silver-magnetite nanoparticles shows a surface plasmon resonance peak at 372 and 474 nm which lies in the visible region of electromagnetic spectrum. The photoluminescence spectrum confirms the obtained nanoparticles to be optically active. The measurements of response for bare magnetite as well as silver-magnetite nanoparticles in an alternating magnetic field reveal their suitability in hyperthermia applications. These synthesized integrated magnetite-silver nanostructures show its potential as an excellent candidate for multimodal applications.
关键词： plasmonic-magnetic,Janus nanoparticles,hyperthermia,silver-magnetite,multimodal applications
更新于2025-09-11 14:15:04
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Optical and Thermophoretic Control of Janus Nanopen Injection into Living Cells
摘要： Devising strategies for the controlled injection of functional nanoparticles and reagents into living cells paves the way for novel applications in nano-surgery, sensing and drug delivery. Here, we demonstrate the light controlled guiding and injection of plasmonic Janus nanopens into living cells. The pens are made of a gold nanoparticle attached to a dielectric alumina shaft. Balancing optical and thermophoretic forces in an optical tweezer allows that single Janus nanopens are trapped and positioned on the surface of living cells. While the optical injection process involves strong heating of the plasmonic side, the temperature of the alumina stays significantly lower, thus allowing the functionalization with fluorescently labelled, single stranded DNA, and hence the spatially controlled injection of genetic material with an untethered nanocarrier.
关键词： optical tweezer,plasmonics,thermophoresis,Janus nanoparticles,cell injection,biomolecule delivery
更新于2025-09-10 09:29:36