ACS Applied Nano Materials

Journal: ACS Applied Nano Materials

Abbreviation

ACS Appl. Nano Mater.

Publisher

American Chemical Society

ISSN

2574-0970

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Publications1 - 10 of 25

Magnetic-Plasmonic Nanoscale Liposomes with Tunable Optical and Magnetic Properties for Combined Multimodal Imaging and Drug Delivery
Cardellini, Jacopo; Surpi, Alessandro; Muzzi, Beatrice; et al. (2024)
ACS Applied Nano Materials
Magnetic–plasmonic nanoparticles (NPs) have shown remarkable potential in hyperthermia, magnetic resonance imaging, and surface-enhanced Raman scattering imaging and diagnostics. However, despite their promise, effective clinical translation remains limited due to a lack of fundamental knowledge about the biological response to these materials, and ongoing efforts seek to bridge the gap between nanomaterial design and effective applicability. To overcome these hurdles, the combination of inorganic NPs with lipid membranes has emerged as an attractive strategy for the biocompatibilization of nanomaterials, preserving the inherent properties of each component and exhibiting synergistic functionalities. This study explores the structural and dynamic aspects of magnetic–plasmonic liposomes produced via spontaneous self-assembly of Au–Fe₃O₄NPs and synthetic liposomes, as a function of the lipid vesicles’ composition and concentration. By combining cryogenic electron microscopy, ultraviolet-visible spectroscopy, and dynamic light scattering, we demonstrated that the bending rigidity and fluidity of the lipid membrane control the aggregation of the NPs on the membrane and the colloidal stability of the hybrids. The experimental results demonstrate that the coexistence of 10 nm Fe₃O₄ magnetic seeds and 50 nm Au–Fe₃O₄NPs plays a crucial role in the assembly of lipid-NP magnetic–plasmonic hybrids. This thermodynamic control allows for fine adjustment of the hybrids’ size and composition, thereby allowing for enhancement and tuning of the magnetic response. Overall, these results pave the way for the development of multifunctional nanomaterials with controlled magnetic–plasmonic properties, obtained via spontaneous self-assembly, as combined nanoprobes and nanovectors for potential applications in multimodal imaging and drug delivery.
InGaN Nanohole Arrays Coated by Lead Halide Perovskite Nanocrystals for Solid-State Lighting
Athanasiou, Modestos; Papagiorgis, Paris; Manoli, Andreas; et al. (2020)
ACS Applied Nano Materials
In this work, we demonstrate efficient light down-conversion via FRET in InGaN/GaN multiple quantum well (MQW) nanohole arrays, coated with green-emitting CsPbBr3 and FAPbBr3 nanocrystals (NCs) and near-infrared (IR) FAPbI3 NC overlayers for solid-state lighting. Patterning the InGaN MQW into nanohole arrays allows a minimum nitride–NC separation while increasing the heterointerfacial area, thus improving simultaneously the nonradiative and radiative transfer efficiencies. Detailed spectroscopic studies of steady-state and time-resolved photoluminescence indicate a significant reduction in the quantum well photoluminescent decay time in the presence of NCs, accompanied by a significant concurrent increase of the NC integrated emission, providing evidence of efficient light down-conversion mediated by FRET with efficiencies as high as ∼83 ± 6% in the green and ∼74 ± 5% in the near-IR.
Electric Field Mediated Contact Time Reduction of Impacting Drops on Cu(OH)2 Nanoneedle Clusters: Limitations and Implications for Anti-Icing and Pathogen-Containment Applications
Stamatopoulos, Christos; Suter, Reto; Franck, Christian (2022)
ACS Applied Nano Materials
In this study, the water drop impact on a copper-based nanotextured superhydrophobic surface inside a uniform electric field is investigated. Because of the wider attention that drop impact draws in the scientific community, this study gives emphasis on the effect of the electric field on the droplet’s residence time, a quantity that plays a key role in processes that involve heat and/or mass transport between the surface and impacting droplet. The reduction of the residence time is of vital importance especially for anti-icing and pathogen-transmission-containment applications. Shorter residence times enable droplets to rebound at supercooled surfaces before the occurrence of ice nucleation. Moreover, they restrict the likelihood of the deposition of viruses and bacteria for the case of pathogen-laden impacting droplets. Reduction of the residence time is achieved by a twofold strategy. The surface is textured in the nanoscale with the growth of a Cu(OH)2 nanoneedle cluster so that the nanoroughness topography in combination with the hydrophobic coating imparts to the surface an extreme water-repellent behavior and impalement resistance. Moreover, we introduce an additional external force exerted on the droplet, which originates from an electric field. We focus on the range of the electric Bond number 0 ≤ Boe ≤ 0.060. In this range, we observe two different interesting behaviors: (a) For 0 ≤ Boe ≤ 0.020, the contact time reduces with the applied electric field. We also conduct simulations to support our experimental findings concerning the effect of the electric field on the contact time. (b) For 0.025 ≤ Boe ≤ 0.060, the contact time increases. We demonstrate that this happens because of partial discharges that induce electrowetting, resulting in altering the wetting behavior of the droplet during retraction. Even though limitations exist, the application of electric fields can be considered to be a promising and flexible strategy for reducing the residence time because it can be applied on a wide range of superhydrophobic surfaces.
Freezing of Gelled Suspensions: a Facile Route toward Mesoporous TiO2 Particles for High-Capacity Lithium-Ion Electrodes
Minas, Clara; Rechberger, Felix; Tervoort, Elena; et al. (2018)
ACS Applied Nano Materials
Assessing the Effect of Magnetite Nanoflowers on Platelets in a Multiscale Approach in the Context of Thromboembolic Diseases
Colombo, Monika; Meng, Yingchao; Poirier-Quinot, Marie; et al. (2024)
ACS Applied Nano Materials
Iron oxide magnetic nanoparticles have emerged as promising theranostic agents for the treatment of cardiovascular diseases. Using a multiscale approach, we investigated the interaction of 26.5 nm diameter multicore magnetite nanoflowers, recognized for being excellent nanoheaters and contrast agents in nanomedicine, with human blood platelets. Using flow cytometry, we determined safe concentrations of magnetite nanoflowers. Data indicated that platelets exhibit reversible activation at high magnetite nanoflower concentrations. Magnetic resonance imaging revealed significant reductions in T-1 and T-2 relaxation times when platelets were combined with magnetite nanoflowers at high concentrations suggesting nanoparticle-platelet interaction. At the nanoscale, transmission and scanning electron microscopy confirmed morphological changes in platelets when exposed to a high concentration of nanoparticles and their partial internalization in the platelets. Overall, the findings support the theranostic potential of magnetite nanoflowers in whole blood for thromboembolic disease management, with the potential for future investigations over longer exposure.
Role of the Capping Ligand in CsPbBr₃ Nanocrystals Amplified Spontaneous Emission Properties
Milanese, Stefania; De Giorgi, Maria Luisa; Morello, Giovanni; et al. (2025)
ACS Applied Nano Materials
Over the past decade, fully inorganic perovskite nanocrystals (NCs) have been proven to be efficient active materials for optoelectronic applications. The photoluminescence and stability properties of these nanostructures are demonstrated to be highly dependent on the surface chemistry and, specifically, on the surfactant molecules used to passivate the surface defects. Here, we present a study of the dependence of the amplified spontaneous emission (ASE) properties of CsPbBr3 perovskite NC thin films, their photostability, and their sensitivity to ambient air on the NC capping ligand. In particular, in this work, four different samples have been analyzed, representatives of the three generations of capping ligands: oleic acid and oleylamine as the first generation, didodecyldimethylammonium bromide as the second generation, and 3-(N,N-dimethyloctadecylammonio)propanesulfonate (ASC18) and lecithin as the third generation. We discuss the different properties of quantum efficiency, optical gain, optical stability, and atmospheric sensing of NCs as a function of the four different ligands employed, focusing on the chemical-physical processes underlying the observed differences. We then establish the structures that ensure the best performances among the four studied physical characteristics. Among all of them, lecithin-capped NCs show the best performances in terms of ASE threshold and sensing. Our results could lay the groundwork for determining the optimal synthesis and processing conditions for perovskite NCs based on future technological applications.
Anatase TiO2 Nanorods as Cathode Materials for Aluminum-Ion Batteries
Wang, Shutao; Kravchyk, Kostiantyn V.; Pigeot-Rémy, Stephanie; et al. (2019)
ACS Applied Nano Materials
Time-Resolved Study on Self-Assembling Behavior of PEGylated Gold Nanoparticles in the Presence of Human Serum Albumin: A System for Nanomedical Applications
Anaraki, Neda Iranpour; Liebi, Marianne; Iranshahi, Kamran; et al. (2022)
ACS Applied Nano Materials
The combination of a microfluidic approach for synchrotron-based dynamic (early structural changes) with lab-based static small-angle X-ray scattering (SAXS) measurements (longer time scale) allows qualifying nanoparticle (NP) systems for their use in nanomedicine. Time-resolved in situ investigations are performed on self-assembly and colloidal behavior of 5 nm PEGylated (polyethylene glycol) gold NPs in different media. SAXS methods combined with a micromixing fluidic system are used to observe the early stage of NP interactions. Dynamic measurements cover a time range from 1 to 100 s after mixing thoroughly, while static measurements complete the study for up to 10 days after sample preparation. These NPs, after mixing with saline solution (0.9% NaCl solution), self-assemble in 3D ordered domains. The NPs also show this ordering in the presence of human serum albumin (HSA) molecules. It is shown that, although the presence of protein molecules slows down the NP self-assembling process, these molecules improve the long-term colloidal stability of the ordered domains probably via interpolymer complexation between PEG and HSA molecules.
Quantum Transport Properties of Nanosized Ta₂O₅ Resistive Switches: Variable Transmission Atomic Synapses for Neuromorphic Electronics
Török, Tímea Nóra; Makk, Péter; Balogh, Zoltán; et al. (2023)
ACS Applied Nano Materials
Filamentary resistive switching (RS) devices are not only considered as promising building blocks for brain-inspired computing architectures but also realize an unprecedented operation regime where the active device volume reaches truly atomic dimensions. Such atomically sized RS filaments represent the quantum transport regime, where the transmission eigenvalues of the conductance channels are considered a specific device fingerprint. Here, we gain insight into the quantum transmission properties of close-to-atomic-sized RS filaments formed across an insulating Ta2O5 layer through superconducting subgap spectroscopy. This method reveals the transmission density function of the open conduction channels contributing to the device’s conductance. Our analysis confirms the formation of truly atomic-sized filaments composed of 3–8 Ta atoms at their narrowest cross-section. We find that this diameter remains unchanged upon RS. Instead, the switching is governed by the redistribution of oxygen vacancies or tantalum cations within the filamentary volume. The set/reset process results in the reduction/formation of an extended barrier at the bottleneck of the filament, which enhances/reduces the transmission of the highly open conduction channels. This transmission variability facilitates neuromorphic electronic applications in nanosized artificial synapses reaching the ultimate atomic scale.
Comment on “Sub-5 nm Nanodiamonds Fabricated by Plasma Immersion Ion Implantation as Fluorescent Probes”
Segawa, Takuya F.; Shames, Alexander I. (2021)
ACS Applied Nano Materials

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