scispace - formally typeset
Search or ask a question
Institution

Jožef Stefan Institute

FacilityLjubljana, Slovenia
About: Jožef Stefan Institute is a facility organization based out in Ljubljana, Slovenia. It is known for research contribution in the topics: Liquid crystal & Dielectric. The organization has 3828 authors who have published 12614 publications receiving 291025 citations.


Papers
More filters
Journal ArticleDOI
TL;DR: In this article, a basic characterization of several low-temperature-sintered calcium silicates, germanates and tellurates was performed to evaluate their potential as glass-free low-permittivity substrate LTCC materials.
Abstract: To reduce the complexity of LTCC systems, and so accelerate the development of LTCC tapes with new functionalities, it is necessary to reduce the number of phases within a particular tape. This can best be done by using glass-free single-phase ceramic systems. We performed a basic characterization of several low-temperature-sintered calcium silicates, germanates and tellurates in order to evaluate their potential as glass-free low-permittivity substrate LTCC materials. Special attention was focused on their microwave and 1 MHz dielectric properties, their sintering behavior and their compatibility with Ag. Two Ca-germanates, which were found to be the most interesting for LTCC applications exhibit a permittivity of ∼10 and low dielectric losses; however, the temperature dependence of permittivity and the sintering temperature must be further reduced. For CaGeO3 the temperature dependence of permittivity was fully suppressed by the addition of 10 mol% of CaTiO3.

109 citations

Journal ArticleDOI
TL;DR: In this article, a plate-like morphology, microstructure and magnetic properties of hematite (α-Fe 2 O 3 ) are discussed with respect to morphology and micro-structure of the particles.

109 citations

Journal ArticleDOI
TL;DR: In this paper, the authors used X-ray powder diffraction (XRD), scanning electron microscopy (SEM), TEM, and dilatometry to characterise the properties of single-phase TiTe 3 O 8 (TiTe O 8)-TeO 2 tie line ceramics.
Abstract: Compositions from TiO 2 –TeO 2 tie line were characterised using X-ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and dilatometry. Results show that the only binary compound existing on the tie line is TiTe 3 O 8 . Single-phase TiTe 3 O 8 was synthesised at 700°C in air and sintered at 720°C to ∼95% of theoretical density. Such ceramics exhibit a relative permittivity of 50, a Q × f -value of 30,600 GHz and a temperature coefficient of resonant frequency ( τ f ) of +133 ppm/°C, measured at ∼5 GHz. The concentration of structural defects in the TiTe 3 O 8 grains is negligible which makes the dielectric properties of TiTe 3 O 8 ceramics insensitive to variations in the heat-treatment conditions. The TiTe 3 O 8 compound is chemically compatible with TeO 2 , which displays a negative temperature coefficient of resonant frequency (a relative permittivity of 19.3, a Q × f -value of 30,000 GHz and a temperature coefficient of resonant frequency of −119 ppm/°C for TeO 2 ceramics with ∼ 20% porosity) and can be used for compensation of the temperature coefficient of resonant frequency of the TiTe 3 O 8 compound. Ceramics from the TiTe 3 O 8 –TeO 2 subsystem can be sintered to >97% of theoretical density at temperatures as low as 670°C, which together with the fact that the ceramics exhibit a highly tunable τ f , relative permittivity around 30 and a Q × f -value of ∼22,000 GHz suggests a potential for use in LTCC technology.

109 citations

Journal ArticleDOI
TL;DR: It is demonstrated that the surface morphology and roughness at the nanoscale level substantially affect the titanium dioxide surface-water droplet interaction, opposing to previous observations for microscale structured surfaces.

109 citations

Journal ArticleDOI
08 May 2019-Nature
TL;DR: This work establishes an approach for linking protein components into robust, higher-order structures, and expands the design space available for supramolecular assemblies to include previously unexplored geometries, and displays excellent chemical and thermal stability.
Abstract: Symmetrical protein cages have evolved to fulfil diverse roles in nature, including compartmentalization and cargo delivery1, and have inspired synthetic biologists to create novel protein assemblies via the precise manipulation of protein-protein interfaces. Despite the impressive array of protein cages produced in the laboratory, the design of inducible assemblies remains challenging2,3. Here we demonstrate an ultra-stable artificial protein cage, the assembly and disassembly of which can be controlled by metal coordination at the protein-protein interfaces. The addition of a gold (I)-triphenylphosphine compound to a cysteine-substituted, 11-mer protein ring triggers supramolecular self-assembly, which generates monodisperse cage structures with masses greater than 2 MDa. The geometry of these structures is based on the Archimedean snub cube and is, to our knowledge, unprecedented. Cryo-electron microscopy confirms that the assemblies are held together by 120 S-Aui-S staples between the protein oligomers, and exist in two chiral forms. The cage shows extreme chemical and thermal stability, yet it readily disassembles upon exposure to reducing agents. As well as gold, mercury(II) is also found to enable formation of the protein cage. This work establishes an approach for linking protein components into robust, higher-order structures, and expands the design space available for supramolecular assemblies to include previously unexplored geometries.

109 citations


Authors

Showing all 3879 results

NameH-indexPapersCitations
Vladimir Cindro129115782000
Igor Mandić128106579498
Jure Leskovec12747389014
Matej Orešič8235226830
P. Križan7874926408
Jose Miguel Miranda7633618080
Vito Turk7427123205
Andrii Tykhonov7327024864
Masashi Yokoyama7331018817
Kostya Ostrikov7276321442
M. Starič7153019136
Boris Turk6723127006
Bostjan Kobe6627917592
Jure Zupan6122812054
Mario Sannino6028117144
Network Information
Related Institutions (5)
École Polytechnique Fédérale de Lausanne
98.2K papers, 4.3M citations

94% related

Centre national de la recherche scientifique
382.4K papers, 13.6M citations

92% related

National Research Council
76K papers, 2.4M citations

91% related

University of Science and Technology of China
101K papers, 2.4M citations

91% related

Oak Ridge National Laboratory
73.7K papers, 2.6M citations

91% related

Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
202331
202268
2021755
2020770
2019653
2018576