110 citations · 1.1k across the 30 of their papers we have counts for
30 papers
Single parameter aging and density scaling
Tina Hecksher, Kristine Niss
In a recent paper, Di Lisio et al. [J. Chem. Phys. 159 064505 (2023)] analyzed a series of temperature down-jumps using the single-parameter aging (SPA) ansatz combined with a spec…
Piezo-Electric Shear Rheometry: Further developments in experimental implementation and data extraction
Mathias Mikkelsen, Kira L. Eliasen, Niclas Lindemann +8
The Piezo-electric Shear Gauge (PSG) [Christensen & Olsen, Rev. Sci. Instrum. 66, 5019, 1995] is a rheometric technique developed to measure the complex shear modulus of viscous li…
Predicting nonlinear physical aging of glasses from equilibrium relaxation via the material time
Birte Riechers, Lisa A. Roed, Saeed Mehri +4
The noncrystalline glassy state of matter plays a role in virtually all fields of materials science and offers complementary properties to those of the crystalline counterpart. The…
Time-scale coupling in hydrogen- and van der Waals-bonded liquids
Lisa A. Roed, Jeppe C. Dyre, Kristine Niss +2
The coupling behavior of time scales of structural relaxation is investigated on the basis of five different response functions for 1,2,6-hexanetriol, a hydrogen-bonded liquid with…
Challenges of interpreting dielectric dilatometry for the study of pressure densification
Alejandro Sanz, Jeppe C. Dyre, Kristine Niss
We report an experimental study documenting the challenge of employing dielectric dilatometry for the study of pressure densification in glass-forming materials. An influence of th…
Generalized single-parameter aging tests and their application to glycerol
Lisa Anita Roed, Tina Hecksher, Jeppe C. Dyre +1
Physical aging of glycerol following temperature jumps is studied by dielectric spectroscopy at temperatures just below the glass transition temperature. The data are analyzed usin…
Isochronal superposition and density scaling of the -relaxation from pico- to millisecond
Henriette Wase Hansen, Bernhard Frick, Simone Capaccioli +2
The relaxation dynamics in two van der Waals bonded and one hydrogen-bonding molecular liquids is studied as a function of pressure and temperature by incoherent neutron scattering…
Experimental evidence of a state-point dependent scaling exponent of liquid dynamics
Alejandro Sanz, Tina Hecksher, Henriette Wase Hansen +2
A large class of liquids have hidden scale invariance characterized by a scaling exponent. In this letter we present experimental evidence that the scaling exponent of liquid dynam…
High-pressure cell for simultaneous dielectric and neutron spectroscopy
Alejandro Sanz, Henriette Wase Hansen, Bo Jakobsen +9
In this article we report on the design, manufacture and testing of a high-pressure cell for doing simultaneous dielectric and neutron spectroscopy. This cell is a unique tool for…
Evidence of a one-dimensional thermodynamic phase diagram for simple glass-formers
Henriette Wase Hansen, Alejandro Sanz, Karolina Adrjanowicz +2
The glass transition plays a central role in nature as well as in industry, ranging from biological systems such as proteins and DNA to polymers and metals. Yet the fundamental und…
Slow rheological mode in glycerol and glycerol-water mixtures
Mikkel H. Jensen, Catalin Gainaru, Christiane Alba-Simionesco +2
Glycerol-water mixtures were studied at molar concentrations ranging from (pure glycerol) to using shear mechanical spectroscopy. We observed…
Variation along liquid isomorphs of the driving force for crystallization
Ulf R. Pedersen, Karolina Adrjanowicz, Kristine Niss +1
We investigate the variation of the driving force for crystallization of a supercooled liquid along isomorphs, curves along which structure and dynamics are invariant. The variatio…
Connection between fragility, mean-squared displacement and shear modulus in two van der Waals bonded glass-forming liquids
Henriette Wase Hansen, Bernhard Frick, Tina Hecksher +2
The temperature dependence of the high-frequency shear modulus measured in the kHz range is compared to the mean-squared displacement measured in the nanosecond range for the two v…
Liquid dynamics in partially crystalline glycerol
Alejandro Sanz, Kristine Niss
We present a dielectric study on the dynamics of supercooled glycerol during crystallization. We explore the transformation into a solid phase in real time by monitoring the tempor…
Thermalization Calorimetry: A simple method for investigating glass transition and crystallization of supercooled liquids
Bo Jakobsen, Alejandro Sanz, Kristine Niss +6
We present a simple method for fast and cheap thermal analysis on supercooled glass-forming liquids. This "Thermalization Calorimetry" technique is based on monitoring the temperat…
A systematic study of the isothermal crystallization of the mono-alcohol n-butanol monitored by dielectric spectroscopy
M. H. Jensen, C. Alba-Simionesco, K. Niss +1
Isothermal crystallization of the mono-hydroxyl alcohol n-butanol was studied with dielectric spectroscopy in real time. The crystallization was carried out using two different sam…
High pressure specific heat spectroscopy reveals simple relaxation behavior of glass forming molecular liquid
Lisa Anita Roed, Kristine Niss, Bo Jakobsen
The frequency dependent specific heat has been measured under pressure for the molecular glass forming liquid 5-polyphenyl-4-ether in the viscous regime close to the glass transiti…
Isomorph theory prediction for the dielectric loss variation along an isochrone
Wence Xiao, Jon Tofteskov, Troels V. Christensen +2
This paper derives a prediction for the variation of the amplitude of the dielectric loss from isomorph theory, and presents an experimental test of the prediction performed by mea…
Two measures of isochronal superposition
Lisa Anita Roed, Ditte Gundermann, Jeppe C. Dyre +1
A liquid obeys isochronal superposition if its dynamics is invariant along the isochrones in the thermodynamic phase diagram (the curves of constant relaxation time). This paper in…
Identical temperature dependence of the time scales of several linear-response functions of two glass-forming liquids
Bo Jakobsen, Tina Hecksher, Kristine Niss +3
The frequency-dependent dielectric constant, shear and adiabatic bulk moduli, longitudinal thermal expansion coefficient, and longitudinal specific heat have been measured for two…
Measuring the dynamic thermal expansivity of molecular liquids near the glass transition
Kristine Niss, Ditte Gundermann, Tage Christensen +1
Based on previous works on polymers by Bauer et al. [Phys, Rev. B (2000)], this paper describes a capacitative method for measuring the dynamical expansion coefficient of a viscous…
Physical aging studied by a device allowing for rapid thermal equilibration
Tina Hecksher, Niels Boye Olsen, Kristine Niss +1
Aging to the equilibrium liquid state of organic glasses is studied. The glasses were prepared by cooling the liquid to temperatures just below the glass transition. Aging followin…
Beta relaxation in the shear mechanics of equilibrium viscous liquids: Phenomenology and network modeling of the alpha-beta merging region
Bo Jakobsen, Kristine Niss, Claudio Maggi +3
The phenomenology of the beta relaxation process in the shear-mechanical response of glass-forming liquids is summarized and compared to that of the dielectric beta process. Furthe…
Connection between slow and fast dynamics of molecular liquids around the glass transition
K. Niss, C. Dalle-Ferrier, B. Frick +3
The mean-square displacement (MSD) was measured by neutron scattering at various temperatures and pressures for a number of molecular glass-forming liquids. The MSD is invariant al…