Browsing NTNU Open by Author "Grendal, Ola Gjønnes"
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Clay alignment takes place during early stages of sedimentation
Kuehn, Rebecca; Kilian, Rüdiger; Lang, Dustin; Morales, Luiz Grafulha; Grendal, Ola Gjønnes; Stipp, Michael (Journal article; Peer reviewed, 2024)The alignment of clay minerals in sediments is of high importance for their mechanical and physical properties. The development of this alignment starts with the deposition of clay, its strength is measured by the ... -
Composition and morphology tuning during hydrothermal synthesis of SrxBa1−xNb2O6 tetragonal tungsten bronzes studied by in situ X-ray diffraction
Grendal, Ola Gjønnes; Blichfeld, Anders Bank; Vu, Tuong-Dan; van Beek, Wouter; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2019)Current interest in 1D ferroelectric materials calls for cheap, controllable, reproducible and environmentally friendly synthesis routes. Hydrothermal synthesis stands out as one of the most promising routes, but a thorough ... -
Controlled growth of SrxBa1-xNb2O6 hopper- and cube-shaped nanostructures by hydrothermal synthesis
Grendal, Ola Gjønnes; Nylund, Inger-Emma; Blichfeld, Anders Bank; Tominaka, Satoshi; Ohara, Koji; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2020)Controlling the shape and size of nanostructured materials has been a topic of interest in the field of material science for decades. In this work, the ferroelectric material SrxBa1-xNb2O6 (x = 0.32–0.82, SBN) was prepared ... -
Controlled Growth of SrxBa1−xNb2O6 Hopper‐ and Cube‐Shaped Nanostructures by Hydrothermal Synthesis
Grendal, Ola Gjønnes; Nylund, Inger-Emma; Blichfeld, Anders Bank; Tominaka, Satoshi; Ohara, Koji; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2020)Controlling the shape and size of nanostructured materials has been a topic of interest in the field of material science for decades. In this work, the ferroelectric material SrxBa1−xNb2O6 (x=0.32–0.82, SBN) was prepared ... -
Controlling Oriented Attachment and in Situ Functionalization of TiO2 Nanoparticles During Hydrothermal Synthesis with APTES
Dalod, Antoine Robert Marie; Grendal, Ola Gjønnes; Skjærvø, Susanne Linn; Inzani, Katherine; Selbach, Sverre Magnus; Henriksen, Lars; van Beek, Wouter; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2017)Understanding growth mechanisms and the role of surface functionalization is of key importance to control shape and morphology of nanoparticles and their properties. Here, we describe the growth mechanism and the effect ... -
Development of polymer-nanoparticle composite with high refractive index
Grendal, Ola Gjønnes (Master thesis, 2016)A newly developed lens technology utilizes a soft high refractive index polymer to change focus. By further increasing the refractive index of the polymer, without lowering the transmittance of visible light, the overall ... -
Facile Low Temperature Hydrothermal Synthesis of BaTiO3 Nanoparticles Studied by In Situ X-ray Diffraction
Grendal, Ola Gjønnes; Blichfeld, Anders Bank; Skjærvø, Susanne Linn; van Beek, Wouter; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2018)Ferroelectric materials are crucial for today’s technological society and nanostructured ferroelectric materials are important for the downscaling of devices. Controlled and reproducible synthesis of these materials are, ... -
A fast, low temperature synthesis method for hexagonal YMnO3: Kinetics, purity, size and shape as studied by in situ X-ray diffraction
Marshall, Kenneth; Blichfeld, Anders Bank; Skjærvø, Susanne Linn; Grendal, Ola Gjønnes; Van Beek, Wouter; Selbach, Sverre Magnus; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2020)The reaction mechanisms, phase development and kinetics of the hydrothermal synthesis of hexagonal‐YMnO3 from Y2O3 and Mn2O3 using in situ X‐ray diffraction are reported under different reaction conditions with temperatures ... -
Hydrothermal synthesis of SrxBa1–xNb2O6 on nanostructured substrates
Einarsrud, Mari-Ann (Master thesis, 2019)I nyere tid har syntese av bly-frie ferroelektriske materialer tiltrukket seg stadig mer oppmerksomhet og et av de studerte materialene er strontium barium niobat (SBN). SBN har vist gode elektro-optiske egenskaper, samt ... -
ID22 - the high-resolution powder-diffraction beamline at ESRF
Fitch, Andrew; Dejoie, Catherine; Covazzi, Ezio; Confalonieri, Giorgia; Grendal, Ola Gjønnes; Claustre, Laurent; Guillou, Perceval; Kieffer, Jerome; de Nolf, Wout; Petitdemange, Sebastien; Ruat, Marie; Watier, Yves (Journal article; Peer reviewed, 2023)Following Phase 2 of the upgrade of the ESRF in which the storage ring was replaced by a new low-emittance ring along with many other facility upgrades, the status of ID22, the high-resolution powder-diffraction beamline, ... -
In situ characterisation for studying nucleation and growth of nanostructured materials and thin films during liquid-based synthesis
Bakken, Kristine; Grendal, Ola Gjønnes; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2022)Knowledge about the nucleation, growth, and formation mechanisms during materials synthesis using sol-gel and solution-based methods is important to design a material with desired properties. We used aqueous chemical ... -
In situ X-ray diffraction studies of the crystallization of K0. 5Na0. 5NbO3 powders and thin films from an aqueous synthesis route
Bakken, Kristine; Gaukås, Nikolai Helth; Grendal, Ola Gjønnes; Blichfeld, Anders Bank; Tominaka, Satoshi; Ohara, Koji; Chernyshov, Dmitry; Glaum, Julia; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2021)Aqueous chemical solution deposition is a promising route for ferroelectric K0.5Na0.5NbO3 (KNN) thin films, requiring a stable precursor solution with complexed Nb5+. Here, we report on the local structure of Nb-complexes ... -
Reaction pathway of the hydrothermal synthesis of AgCuO2 from in situ time-resolved X-ray diffraction
Liu, hongjun; Grendal, Ola Gjønnes; Skjærvø, Susanne Linn; Dalod, Antoine Robert Marie; van Beek, Wouter; sekkat, abderrahime; Einarsrud, Mari-Ann; munoz-Rojas, David (Journal article; Peer reviewed, 2020)AgCuO2 is an interesting semiconductor oxide with appealing optical and electronic properties. While the oxide has been synthesized in bulk by different approaches, no study on the formation mechanism has been carried out ... -
Refinement of the uranium dispersion corrections from anomalous diffraction
Leinders, Gregory; Grendal, Ola Gjønnes; Arts, Ine; Bes, Rene; Prozheev, Igor; Orlat, Simon; Fitch, Andrew; Kvashnina, Kristina; Verwerft, Marc (Peer reviewed; Journal article, 2024) -
Structural and electrical properties of tetragonal tungsten bronze K4Bi2Nb10O30-Ba4Na2Nb10O30 solid solutions across two proximate phase transitions
Løndal, Nora Statle; Zeiger, Caren Regine; Grendal, Ola Gjønnes; Einarsrud, Mari-Ann; Walker, Julian Bradley; Grande, Tor (Journal article; Peer reviewed, 2024)Tetragonal tungsten bronzes allow for broader compositional engineering compared to perovskites. Here we investigate solid solutions between Ba4Na2Nb10O30 (BNN) and K4Bi2Nb10O30 (KBiN). A transition from orthorhombic to ... -
Structure and Optical Properties of Titania-PDMS Hybrid Nanocomposites Prepared by In Situ Non-Aqueous Synthesis
Dalod, Antoine Robert Marie; Grendal, Ola Gjønnes; Blichfeld, Anders Bank; Furtula, Vedran; Pérez, Javier; Henriksen, Lars; Grande, Tor; Einarsrud, Mari-Ann (Journal article; Peer reviewed, 2017)Organic-inorganic hybrid materials are attractive due to the combination of properties from the two distinct types of materials. In this work, transparent titania-polydimethylsiloxane hybrid materials with up to 15.5 vol. ... -
Understanding the Hydrothermal Formation of NaNbO3: Its Full Reaction Scheme and Kinetics
Skjærvø, Susanne Linn; Ong, Gary K.; Grendal, Ola Gjønnes; Wells, Kristin Høydalsvik; Van Beek, Wouter; Ohara, Koji; Milliron, Delia J.; Tominaka, Satoshi; Grande, Tor; Einarsrud, Mari-Ann (Peer reviewed; Journal article, 2021)Sodium niobate (NaNbO3) attracts attention for its great potential in a variety of applications, for instance, due to its unique optical properties. Still, optimization of its synthetic procedures is hard due to the lack ...