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Item type:Item, Access status: Open Access , Gas-phase flow-through photocatalysis using wirelessly anodized WO3 nanoporous layers on Tungsten 3D meshes produced by extrusion-based additive manufacturing(Elsevier, 2025-11-01) Sepúlveda Sepúlveda, Lina Marcela; Baudys, Michal; Oliver Urrutia, Carolina; Cicmancova, Veronika; Rodriguez Pereira, Jhonatan; Hromadko, Ludek; Sopha, Hanna Ingrid; Montufar Jimenez, Edgar Benjamin; Čelko, Ladislav; Krysa, Josef; Macák, JanHerein, hierarchically porous 3D W meshes were fabricated via extrusion-based additive manufacturing, using commercially pure W powder as feedstock. These mechanically robust structures exhibit high porosity and an effective surface area of approximately 60 cm2, making them highly promising for gas-phase photocatalysis. Wireless anodization via bipolar electrochemistry was successfully applied to form nanoporous WO3 layers on the 3D meshes, for the first time. These meshes were then employed for photocatalytic acetaldehyde degradation in a flow-through reactor designed according to ISO standards. Compared with thermally grown WO3 layers on identical 3D W meshes, the nanoporous WO3 layers showed superior performance due to their larger surface area, achieving -7% acetaldehyde conversion and a mineralization rate of -93%, indicating that nearly all removed acetaldehyde was fully mineralized. These findings highlight the potential of anodized 3D W meshes for innovative applications in flow-through photocatalytic reactors.Item type:Item, Access status: Open Access , Magnetism of Ultrathin TiO2 Films Prepared by Atomic Layer Deposition(American Chemical Society, 2025-10-17) Rodriguez Pereira, Jhonatan; Gazdova, Kristyna; Pham, Nguyen Sy; Pizurova, Nadezda; Kurka, Michal; Pavlu, Jana; Nguyen, Hoa Hong; Friák, Martin; Macák, JanThe discovery of room-temperature ferromagnetism (FM) in pristine TiO2 films has sparked intense debate regarding its origin, particularly in the absence of conventional magnetic dopants. Herein, for the first time, the FM of ultrathin TiO2 films grown on LaAlO3 (LAO) substrates by Atomic Layer Deposition (ALD) is investigated, yielding TiO2 thicknesses of 1, 5, and 10 nm. The findings reveal a striking thickness-dependent magnetic response, where the 5 nm films exhibit the highest ferromagnetic response, attributed to defect-driven mechanisms. Structural and spectroscopic analyses, complemented by quantum mechanical calculations, highlight the critical role of oxygen vacancies and/or defects, as well as the interface with LAO substrates, in modulating the observed FM. Notably, this work demonstrates that the ferromagnetic behavior is confined to the in-plane direction, reinforcing the role of surface and interface effects. These insights establish that defects play a key role in tuning the electronic and magnetic properties of ultrathin TiO2 films, paving the way for potential applications in next-generation magnetic devices.Item type:Item, Access status: Open Access , Engineering Two-in-One Nanoparticles for Simultaneous Delivery of Graphene Quantum Dot and Pemetrexed(American Chemical Society, 2025-10-21) Oz, Umut Can; Kucukturkmen, Berrin; Gomez, I. Jennifer; Elsherbeny, Amr; Ipek Tekneci, Seda; Esim, Ozgur; Goksever, Selin; Ozkose, Umut Ugur; Gulyuz, Sevgi; Bazan-Cobelo, Claudia; Yilmaz, Ozgur; Ustundag, Aylin; Medalova, Jirina; Bozkir, Asuman; Zajíčková, Lenka; Er, EnginThe simultaneous delivery of therapeutic agents and imaging probes using polymeric nanoparticles (NPs) has gained significant attention for cancer treatment. In this work, we developed a multifunctional nanocarrier system composed of an amphiphilic block copolymer, poly(2-ethyl-2-oxazoline)-b-poly(epsilon-caprolactone) (PEtOx-b-PCL), and dimethyldidodecylammonium bromide (DDAB), for the codelivery of the chemotherapeutic drug pemetrexed (PMT) and nitrogen- or sulfur-doped graphene quantum dots (N-GQDs or S-GQDs) as fluorescent probes. Critical formulation parameters were optimized using a central composite design (CCD). The optimized NPs exhibited favorable physicochemical properties, including positive surface charge (6-8 mV), hydrodynamic diameters of similar to 140 nm, and high encapsulation efficiency for both PMT (46-56%) and GQDs (>98%). In vitro assays revealed that PMT-loaded nanoparticles (NPs) significantly enhanced cytotoxicity against MCF-7 cells. At a concentration of 2 ppm after 72 h, N-PMT NPs and S-PMT NPs inhibited cell proliferation by 50.7% and 53.8%, respectively, compared to 37.8% inhibition with free PMT at the same dose. Confocal microscopy confirmed efficient intracellular uptake and strong fluorescence signals, supporting their potential for bioimaging. Collectively, these results demonstrate that this two-in-one nanocarrier system significantly enhances chemotherapeutic efficacy while enabling real-time imaging, establishing a promising platform for drug delivery and noninvasive treatment monitoring in cancer nanomedicine.Item type:Item, Access status: Open Access , Resolution in Two-Photon Imaging: A Local Manifestation of Entanglement(American Chemical Society, 2025-10-15) Gregory, T.; Toninelli, E.; Moreau, P. -A.; Mekhail, S. P.; Wolley, O.; Roberts, K.; Bělín, Jakub; Barnett, S. M.; Padgett, M. J.The resolution of a classical imaging system is limited by diffraction. This limit can be overcome, for example, by implementing various forms of localization microscopy in which the center of a fluorescence distribution is estimated to an accuracy scaling with the square root of the number of detected photons, N . In quantum imaging the object can be illuminated using correlated photon-pairs, leading early work to suggest that a 2 improvement could be obtained as a result of averaging the position of N = 2 events. However, similar to quantum lithography, which relies upon quantum illumination using entangled photon-pairs and two-photon absorption, the minimum resolvable feature size is reduced by a factor of 2, not just 2 . Quantum imaging schemes can also lead to a factor of 2 improvement. By using a similar source of correlated photon-pairs to illuminate an object, a single-photon sensitive camera to detect the photon-pairs, and an image processing algorithm to record and sum the bisector positions of the transmitted photon-pairs, we realize a similar factor of x2 improvement in image resolution, surpassing that of most earlier quantum imaging work.Item type:Item, Access status: Open Access , A band-aid-based MoSe2/Nb2C wearable supercapacitor for integrated ammonium-ion energy storage and real-time pressure monitoring(Royal Society of Chemistry, 2025-10-21) Manoharan, Kaaviah; Pumera, MartinThe market for wearable electronic devices is rapidly growing, with increasing potential for future development. Researchers around the globe are striving to enhance these devices, focusing on achieving a balance between functionality and wearability to drive commercialization. Supercapacitors are regarded as one of the most promising energy storage technologies, bridging the gap between conventional batteries and dielectric capacitors to support high-power applications. This study presents the hybrid supercapacitor application of molybdenum sulfide, molybdenum selenide, and niobium carbide on band-aid-based wearable electrodes tested in three different electrolytes (sodium sulfate, ammonium sulfate, and zinc sulfate). Among the three electrolytes, the ammonium sulfate electrolyte exhibited exceptional electrochemical performance, including high specific capacitance, excellent power density, and remarkable cycling stability. Band-aid-based wearable ammonium ion hybrid supercapacitors were designed to explore their real-time applicability, utilizing activated carbon as the negative electrode and molybdenum selenide/niobium carbide as the positive electrode. The fabricated ammonium ion hybrid supercapacitor offers a maximum specific capacitance of 120 F g-1 with 92% capacitance retention after 20 000 cycles. Also, it exhibits an outstanding energy density and power density. This suggested multipurpose integrated system opens new possibilities for creating flexible and adaptive wearable electronics. A glucose sensor is shown to be powered by the fabricated ammonium ion hybrid supercapacitor. The molybdenum selenide/niobium carbide-coated band-aid is also sandwiched between tiny layers of copper foil to create a pressure sensor. It is powered by an ammonium ion hybrid supercapacitor, which enables precise and steady real-time monitoring of the radial pulse pressure on the wrist of a person. This work creates new opportunities to explore the potential of wearable technology and nanomaterials to develop self-sufficient, cost-effective healthcare systems for monitoring health parameters in real-time.