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  1. Article ; Online: Control of Intermolecular Interactions toward the Production of Free-Standing Interfacial Polydopamine Films.

    Szewczyk, Jakub / Babacic, Visnja / Krysztofik, Adam / Ivashchenko, Olena / Pochylski, Mikołaj / Pietrzak, Robert / Gapiński, Jacek / Graczykowski, Bartłomiej / Bechelany, Mikhael / Coy, Emerson

    ACS applied materials & interfaces

    2023  Volume 15, Issue 30, Page(s) 36922–36935

    Abstract: Aggregation of the polydopamine (PDA) molecular building blocks at the air/water interface leads to obtaining large surface nanometric-thin films. This mechanism follows two possible pathways, namely, covalent or non-covalent self-assembly, which result ... ...

    Abstract Aggregation of the polydopamine (PDA) molecular building blocks at the air/water interface leads to obtaining large surface nanometric-thin films. This mechanism follows two possible pathways, namely, covalent or non-covalent self-assembly, which result in a different degree of structure order and, consequently, different structural properties. Control of this mechanism could be vital for applications that require true self-support PDA free-standing films, for example, electrochemical sensing or membrane technology. Here, we are considering the impact of boric acid (BA) and Cu
    Language English
    Publishing date 2023-07-25
    Publishing country United States
    Document type Journal Article
    ISSN 1944-8252
    ISSN (online) 1944-8252
    DOI 10.1021/acsami.3c05236
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Size-dependent nanoscale soldering of polystyrene colloidal crystals by supercritical fluids.

    Varghese, Jeena / Mohammadi, Reza / Pochylski, Mikolaj / Babacic, Visnja / Gapinski, Jacek / Vogel, Nicolas / Butt, Hans-Juergen / Fytas, George / Graczykowski, Bartlomiej

    Journal of colloid and interface science

    2022  Volume 633, Page(s) 314–322

    Abstract: Hypothesis: Polymer particles self-assembled into colloidal crystals have exciting applications in photonics, phononics, templates for nanolithography, and coatings. Cold soldering utilizing polymer plasticization by supercritical fluids enables a novel, ...

    Abstract Hypothesis: Polymer particles self-assembled into colloidal crystals have exciting applications in photonics, phononics, templates for nanolithography, and coatings. Cold soldering utilizing polymer plasticization by supercritical fluids enables a novel, low-cost, low-effort, chemical-free means for uniform mechanical strengthening of fragile polymer colloidal crystals at moderate temperatures. Here, we aim to elucidate the role of particle size and gas-specific response for the most efficient soldering, exploring the full potential of this method.
    Experiments: We investigate the elastic properties of polystyrene colloidal crystals made of nanoparticles with different diameters (143 to 830 nm) upon treatment with supercritical Ar and He at room temperature. By employing Brillouin light scattering, we quantify the effect of nanoparticle size on the strengthening of interparticle contacts, evaluating the permanent change in the effective elastic modulus upon cold soldering.
    Findings: The relative change in the effective elastic modulus reveals nonmonotonic dependence on the particle size with the most efficient soldering for mid-sized nanoparticles (about 610 nm diameter). We attribute this behavior to the crucial role of intrinsic fabrication impurities, which reduces the nanoparticles' free surface exposed to plasticization by supercritical fluids. Supercritical Ar, a good solvent for polystyrene, enabled effective soldering of nanoparticles, whereas high-pressure He treatment is entirely reversible.
    Language English
    Publishing date 2022-11-24
    Publishing country United States
    Document type Journal Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2022.11.090
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Thickness-Dependent Elastic Softening of Few-Layer Free-Standing MoSe

    Babacic, Visnja / Saleta Reig, David / Varghese, Sebin / Vasileiadis, Thomas / Coy, Emerson / Tielrooij, Klaas-Jan / Graczykowski, Bartlomiej

    Advanced materials (Deerfield Beach, Fla.)

    2021  Volume 33, Issue 23, Page(s) e2008614

    Abstract: Few-layer van der Waals (vdW) materials have been extensively investigated in terms of their exceptional electronic, optoelectronic, optical, and thermal properties. Simultaneously, a complete evaluation of their mechanical properties remains an ... ...

    Abstract Few-layer van der Waals (vdW) materials have been extensively investigated in terms of their exceptional electronic, optoelectronic, optical, and thermal properties. Simultaneously, a complete evaluation of their mechanical properties remains an undeniable challenge due to the small lateral sizes of samples and the limitations of experimental tools. In particular, there is no systematic experimental study providing unambiguous evidence on whether the reduction of vdW thickness down to few layers results in elastic softening or stiffening with respect to the bulk. In this work, micro-Brillouin light scattering is employed to investigate the anisotropic elastic properties of single-crystal free-standing 2H-MoSe
    Language English
    Publishing date 2021-05-03
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 1474949-X
    ISSN 1521-4095 ; 0935-9648
    ISSN (online) 1521-4095
    ISSN 0935-9648
    DOI 10.1002/adma.202008614
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  4. Article ; Online: Mechanical reinforcement of polymer colloidal crystals by supercritical fluids.

    Babacic, Visnja / Varghese, Jeena / Coy, Emerson / Kang, Eunsoo / Pochylski, Mikolaj / Gapinski, Jacek / Fytas, George / Graczykowski, Bartlomiej

    Journal of colloid and interface science

    2020  Volume 579, Page(s) 786–793

    Abstract: Colloidal crystals realized by self-assembled polymer nanoparticles have prominent attraction as a platform for various applications from assembling photonic and phononic crystals, acoustic metamaterials to coating applications. However, the fragility of ...

    Abstract Colloidal crystals realized by self-assembled polymer nanoparticles have prominent attraction as a platform for various applications from assembling photonic and phononic crystals, acoustic metamaterials to coating applications. However, the fragility of these systems limits their application horizon. In this work the uniform mechanical reinforcement and tunability of 3D polystyrene colloidal crystals by means of cold soldering are reported. This structural strengthening is achieved by high pressure gas (N
    Language English
    Publishing date 2020-06-29
    Publishing country United States
    Document type Journal Article
    ZDB-ID 241597-5
    ISSN 1095-7103 ; 0021-9797
    ISSN (online) 1095-7103
    ISSN 0021-9797
    DOI 10.1016/j.jcis.2020.06.104
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Bonn / Germany

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  5. Article: On the Structure of Ultrathin FeO Films on Ag(111).

    Lewandowski, Mikołaj / Pabisiak, Tomasz / Michalak, Natalia / Miłosz, Zygmunt / Babačić, Višnja / Wang, Ying / Hermanowicz, Michał / Palotás, Krisztián / Jurga, Stefan / Kiejna, Adam

    Nanomaterials (Basel, Switzerland)

    2018  Volume 8, Issue 10

    Abstract: Ultrathin transition metal oxide films exhibit unique physical and chemical properties not observed for the corresponding bulk oxides. These properties, originating mainly from the limited thickness and the interaction with the support, make those films ... ...

    Abstract Ultrathin transition metal oxide films exhibit unique physical and chemical properties not observed for the corresponding bulk oxides. These properties, originating mainly from the limited thickness and the interaction with the support, make those films similar to other supported 2D materials with bulk counterparts, such as transition metal dichalcogenides. Ultrathin iron oxide (FeO) films, for example, were shown to exhibit unique electronic, catalytic and magnetic properties that depend on the type of the used support. Ag(111) has always been considered a promising substrate for FeO growth, as it has the same surface symmetry, only ~5% lattice mismatch, is considered to be weakly-interacting and relatively resistant to oxidation. The reports on the growth and structure of ultrathin FeO films on Ag(111) are scarce and often contradictory to each other. We attempted to shed more light on this system by growing the films using different preparation procedures and studying their structure using scanning tunneling microscopy (STM), low energy electron diffraction (LEED) and X-ray photoelectron spectroscopy (XPS). We observed the formation of a previously unreported Moiré superstructure with 45 Å periodicity, as well as other reconstructed and reconstruction-free surface species. The experimental results obtained by us and other groups indicate that the structure of FeO films on this particular support critically depends on the films' preparation conditions. We also performed density functional theory (DFT) calculations on the structure and properties of a conceptual reconstruction-free FeO film on Ag(111). The results indicate that such a film, if successfully grown, should exhibit tunable thickness-dependent properties, being substrate-influenced in the monolayer regime and free-standing-FeO-like when in the bilayer form.
    Language English
    Publishing date 2018-10-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662255-5
    ISSN 2079-4991
    ISSN 2079-4991
    DOI 10.3390/nano8100828
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Book ; Online: Real-time observation of Ostwald ripening in an oxide-on-metal system

    Michalak, Natalia / Ossowski, Tomasz / Miłosz, Zygmunt / Prieto, Mauricio J. / Wang, Ying / Werwiński, Mirosław / Babacic, Visnja / Genuzio, Francesca / Vattuone, Luca / Kiejna, Adam / Schmidt, Thomas / Lewandowski, Mikołaj

    Understanding the mechanisms that drive the size and structure of oxide species in "inverse" catalysts

    2021  

    Abstract: Oxides-on-metals are the well-known "inverse" catalysts. Fundamental knowledge on the structural transformations that occur in such systems under oxidizing and reducing conditions is crucial for maximizing their catalytic activity. Sintering of oxide ... ...

    Abstract Oxides-on-metals are the well-known "inverse" catalysts. Fundamental knowledge on the structural transformations that occur in such systems under oxidizing and reducing conditions is crucial for maximizing their catalytic activity. Sintering of oxide species is one of the effects that may, on one hand, lead to catalyst deactivation, but on the other constitutes a powerful means for fine-tuning their size and structure - which is one of the major challenges in the field. In this Letter, we show that the structure of well-dispersed bilayer iron monoxide (FeO) islands grown on Ru(0001), which constitutes a model "inverse" catalyst, can be optimized by thermally-driven sintering and phase transition. The structural transformation occurs via the Ostwald ripening mechanism, as observed in real time using in situ low energy electron microscopy (LEEM). The structure of the islands before and after the transformation is determined using ex situ experimental methods, as well as theoretical calculations.
    Keywords Physics - Chemical Physics ; Condensed Matter - Mesoscale and Nanoscale Physics ; Condensed Matter - Materials Science
    Subject code 540
    Publishing date 2021-05-03
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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