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674 results on '"De Geyter, Nathalie"'

8. A preclinical platform for assessing long-term drug efficacy exploiting mechanically tunable scaffolds colonized by a three-dimensional tumor microenvironment

Author

De Vlieghere, Elly, Van de Vijver, Koen, Blondeel, Eva, Carpentier, Nathan, Ghobeira, Rouba, Pauwels, Jarne, Riemann, Sebastian, Minsart, Manon, Fieuws, Charlotte, Mestach, Johanna, Baeyens, Ans, De Geyter, Nathalie, Debbaut, Charlotte, Denys, Hannelore, Descamps, Benedicte, Claes, Kathleen, Vral, Anne, Van Dorpe, Jo, Gevaert, Kris, De Geest, Bruno G., Ceelen, Wim, Van Vlierberghe, Sandra, and De Wever, Olivier

Published
2023
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42. Immobilization of plasma filaments in a dielectric barrier discharge: fundamental study and application to the synthesis of patterned coatings

Author

Reniers, François, Schweicher, Guillaume, De Geyter, Nathalie, Dufour, Thierry, Gordon, Michael J, Hubert, Julie, Ustarroz Troyano, Jon, Demaude, Annaelle, Reniers, François, Schweicher, Guillaume, De Geyter, Nathalie, Dufour, Thierry, Gordon, Michael J, Hubert, Julie, Ustarroz Troyano, Jon, and Demaude, Annaelle

Abstract

Dielectric barrier discharges (DBDs) have been used for ozone production since the 19th century. Beyond their historic application, their versatility extends to diverse fields, including plasma medicine and material surface modification. DBDs most commonly operate in the filamentary regime, characterized by short-lived microdischarges (often called filaments) igniting randomly in the inter-electrode space, which can cause inhomogeneities in surface treatment or film deposition. Although this makes them generally undesirable for such applications, filaments hold significant potential as micro-reactors for localized treatment or deposition if their ignition mechanism and chemistry can be understood and controlled. While considerable work exists on understanding DBD regimes and avoiding the filamentary mode, poor reporting has been made on deposition processes at the filament scale. In this thesis, we aimed to address this with a system of immobilized DBD filaments. The latter was achieved through local gap reduction via dielectric patterning. This approach facilitated local discharge analysis and allowed us to test the potential of these filaments for surface patterning applications. For this last point, propargyl methacrylate (PMA) was chosen as test-case precursor for thin film deposition. The study of the discharge focused on the dynamics and properties of individual filaments and of the overall discharge under varying operating parameters such as gap width, applied voltage, PMA feed rate, and dielectric pattern geometry. For this purpose, we performed high-speed camera imaging, electrical measurements, and optical emission spectroscopy (OES) imaging of a filament. Deposition with the immobilized filaments system from Ar/PMA mixture resulted in patterned coatings. The higher reactivity inside the filaments generated circular hill-like areas (spots), while a thinner film was also deposited between the spots. Spatially resolved characterizations using profilometry, X, Doctorat en Sciences, info:eu-repo/semantics/nonPublished

Published
2024

43. Engineering Porosity and Functionality in a Robust Twofold Interpenetrated Bismuth-Based MOF: Toward a Porous, Stable, and Photoactive Material

Author

A. Mohamed, Wafaa, Chakraborty, Jeet, Bourda, Laurens, Lavendomme, Roy, Liu, Chunhui, Morent, Rino, De Geyter, Nathalie, Van Hecke, Kristof, Kaczmarek, Anna M., Van der Voort, P., A. Mohamed, Wafaa, Chakraborty, Jeet, Bourda, Laurens, Lavendomme, Roy, Liu, Chunhui, Morent, Rino, De Geyter, Nathalie, Van Hecke, Kristof, Kaczmarek, Anna M., and Van der Voort, P.

Abstract

Defect engineering in metal–organic frameworks (MOFs) has gained worldwide research traction, as it offers tools to tune the properties of MOFs. Herein, we report a novel 2-fold interpenetrated Bi-based MOF made of a tritopic flexible organic linker, followed by missing-linker defect engineering. This procedure creates a gradually augmented micro- and mesoporosity in the parent (originally nonporous) network. The resulting MOFs can tolerate a remarkable extent of linker vacancy (with absence of up to 60% of linkers per Bi node) created by altering the crystal-growth rate as a function of synthesis temperature and duration. Owing to the enhanced porosity and availability of the uncoordinated Lewis acidic Bi sites, the defect-engineered MOFs manifested improved surface areas, augmented CO2 and water vapor uptake, and catalytic activity. Parallel to this, the impact of defect engineering on the optoelectronic properties of these MOFs has also been studied, offering avenues for new applications., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2024

46. Chapter Plasma Polymerization for Tissue Engineering Purposes

Author

Morent, Rino, Ghobeira, Rouba, Aziz, Gaelle, and De Geyter, Nathalie

Subjects
biomaterial, plasma polymer, surface gradient, stability, aging, bic Book Industry Communication::M Medicine::MQ Nursing & ancillary services::MQW Biomedical engineering
Abstract

The ability of non-equilibrium plasmas to modify surfaces has been known for many years. And a promising way to perform surface modifications without altering the bulk properties is plasma polymerization since this technique is versatile and can be applied to a wide range of materials. Plasma polymer films usually show good biocompatibility when compared to classical biomaterials. The possible biomedical use of plasma polymers motivates the study of their behavior during storage and in aqueous environment. Therefore, it is of major importance to understand the change of properties of these plasma polymers over time and when in contact with certain fluids. Recently, plasma polymer gradients (surfaces that display a change in at least one physicochemical property over distance) have attracted significant attention from the biomedical filed where the interaction of cells with a material surface is of major interest. This chapter discusses biomaterial functionalization via plasma polymerization focusing on their use in the biomedical field as well as their aging and stability behaviors. Plasma polymer gradients as valuable tools to investigate cell-surface interactions will also be reviewed.

Published
2018
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47. Acetylacetone functionalized periodic mesoporous organosilicas: from sensing to catalysis.

Author

Liu, Chunhui, Haghighat, Mahdieh, Jena, Himanshu Sekhar, Poelman, Dirk, De Geyter, Nathalie, Morent, Rino, Kaczmarek, Anna M., and Van Der Voort, Pascal

Abstract

25 years after the first papers on the development of Periodic Mesoporous Organosilicas, and in this special issue in honor of prof. Ozin who stood at the cradle of PMOs, we here report for the first time an "acac-PMO" with the acac-functionality intact and embedded in the organic environment of the linker. Periodic mesoporous organosilicas (PMOs) have emerged as versatile sensors due to their stability, low toxicity, and scalability. This study reports for the first time on embedding the acetylacetone (acac) group into the PMO backbone. This integration of acac into the PMO framework opens new applications in both sensing and catalysis. The Eu3+ grafted acac-PMOs demonstrate enhanced sensitivity, with a detection limit of 108 nM, and high selectivity in aqueous copper (Cu2+) ion sensing. Additionally, these novel PMOs show high catalytic efficiency in Mannich reactions. [ABSTRACT FROM AUTHOR]

Published
2024
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48. Plasma-Catalytic Removal of VOCs

Author

Cools, Pieter, De Geyter, Nathalie, Morent, Rino, Drake, Gordon W. F., Editor-in-Chief, Babb, James, Series Editor, Bandrauk, Andre D., Series Editor, Bartschat, Klaus, Series Editor, Joachain, Charles J., Series Editor, Keidar, Michael, Series Editor, Lambropoulos, Peter, Series Editor, Leuchs, Gerd, Series Editor, Velikovich, Alexander, Series Editor, Tu, Xin, editor, Whitehead, J. Christopher, editor, and Nozaki, Tomohiro, editor

Published
2019
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