Published Research – Page 2

Crystallization mechanisms in cream during ripening and initial butter churning

Buldo, Patrizia; Kirkensgaard, Jacob JK; Wiking, Lars
Journal of Dairy Science, 2013

The temperature treatment of cream is the time-consuming step in butter production. A better understanding of the mechanisms leading to partial coalescence, such as fat crystallization during ripening and churning of the …

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Investigating the activity enhancement on Pt x Co 1- x alloys induced by a combined strain and ligand effect

Spanos, Ioannis; Kirkensgaard, Jacob JK; Mortensen, Kell; Arenz, Matthias
Journal of Power Sources, 2014

Due to their high activity for the oxygen reduction reaction (ORR), Pt based alloys are of considerable interest as catalysts for polymer electrolyte fuel cells (PEMFC). We present two synthesis protocols that …

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Influence of microporosity in SBA-15 on the release properties of anticancer drug dasatinib

Kjellman, T.; Xia, X.; Alfredsson, V.; Garcia-Bennett, A. E.
Journal of Materials Chemistry B, 2014

The release of the hydrophobic cancer drug dasatinib from two mesoporous silica materials as drug delivery vehicles has been studied. One material is a reference 2D-hexagonal SBA-15 with the typical bimodal pore …

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Chiroptical Activity in Silver Cholate Nanostructures Induced by the Formation of Nanoparticle Assemblies

Layani, Muriel E.; Ben Moshe, Assaf; Varenik, Maxim; Regev, Oren; Zhang, Hui; Govorov, Alexander O.; Markovich, Gil
The Journal of Physical Chemistry C, 2013

We report on an interesting mechanism of inducing chiroptical response at plasmonic silver nanoparticles (NPs) through the formation of plasmonic hot spots in small metal-NP–chiral-surfactant assemblies. Circular dichroism (CD) was measured at …

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Highly proton conducting electrolyte membranes based on poly (arylene sulfone) s with tetrasulfonated segments

Weiber, E. Annika; Takamuku, Shogo; Jannasch, Patric
Macromolecules, 2013

A series of fully aromatic polymers having only sulfone bridges linking the aromatic rings have been synthesized via polycondensations and studied as proton-exchange membranes. Mixtures of tetrasulfonated 4,4′-bis[(4-chlorophenyl)sulfonyl]-1,1′-biphenyl (BCPSBP), non-sulfonated BCPSBP, and …

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Self-assembly of designed coiled coil peptides studied by small-angle X-ray scattering and analytical ultracentrifugation

Malik, Leila; Nygaard, Jesper; Christensen, Niels J.; Streicher, Werner W.; Thulstrup, Peter W.; Arleth, Lise; Jensen, Knud J.
Journal of Peptide Science, 2013

α-Helical coiled coil structures, which are noncovalently associated heptad repeat peptide sequences, are ubiquitous in nature. Similar amphipathic repeat sequences have also been found in helix-containing proteins and have played a central …

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Shear and Rapeseed Oil Addition Affect the Crystal Polymorphic Behavior of Milk Fat

Kaufmann, Niels; Kirkensgaard, Jacob J. K.; Andersen, Ulf; Wiking, Lars
Journal of the American Oil Chemists' Society, 2013

The effect of shear on the crystallization kinetics of anhydrous milk fat (AMF) and blends with 20 and 30 % w/w added rapeseed oil (RO) was studied. Pulse 1H NMR was used to follow the …

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Tuning the aqueous self-assembly of multistimuli-responsive polyanionic peptide nanorods

von Gröning, Maximilian; de Feijter, Isja; Stuart, Marc CA; Voets, Ilja K.; Besenius, Pol
Journal of Materials Chemistry B, 2013

We report the pH and ionic strength triggered self-assembly of polyanionic dendritic peptideamphiphiles into well-defined nanorods in water; by establishing state diagrams we show how frustrated growth is used as a sensitive tool in order to manipulate and control …

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3D titania photonic crystals replicated from gyroid structures in butterfly wing scales: approaching full band gaps at visible wavelengths

Mille, Christian; Tyrode, Eric C.; Corkery, Robert W.
RSC Advances, 2013

3D titania photonic crystals are replicated from single gyroid structures found in the butterflyCallophrys rubi. Photonic crystals were characterised using SEM imaging, X-ray and Raman scattering and reflection spectroscopy. The overall symmetry and topology of …

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Orientation behaviour of the minor director of homeotropically oriented nematic elastomers in mechanical fields

Brömmel, F.; Benzie, P.; Osterwinter, G. J.; Kramer, D.; Finkelmann, H.; Elston, S.; Hoffmann, A.
Soft Matter, 2013

We report the synthesis of a thin nematic elastomer film where the major director of the mesogenic moieties (i.e. the average orientation of the main molecular axes) is permanently oriented parallel to the …

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Pt based PEMFC catalysts prepared from colloidal particle suspensions – a toolbox for model studies

Speder, Jozsef; Altmann, Lena; Roefzaad, Melanie; Bäumer, Marcus; Kirkensgaard, Jacob J. K.; Mortensen, Kell; Arenz, Matthias
Physical Chemistry Chemical Physics, 2013

A colloidal synthesis approach is presented that allows systematic studies of the properties of supported proton exchange membrane fuel cell (PEMFC) catalysts. The applied synthesis route is based on the preparation of …

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Effect of cream cooling rate and water content on butter microstructure during four weeks of storage

Rønholt, Stine; Kirkensgaard, Jacob Judas Kain; Mortensen, Kell; Knudsen, Jes Christian
Food Hydrocolloids, 2014

Crystallization, rheological properties and microstructure of butter with varying water content and subjected to different cooling rate were studied during four weeks of storage at 5 °C. Using small and large deformation rheology, …

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Polymorphism, microstructure and rheology of butter. Effects of cream heat treatment

Rønholt, Stine; Kirkensgaard, Jacob Judas Kain; Pedersen, Thomas Bæk; Mortensen, Kell; Knudsen, Jes Christian
Food Chemistry, 2012

The effect of cream heat treatment prior to butter manufacturing, fluctuating temperatures during storage and presence of fat globules vs. no fat globules was examined in laboratory scale produced butter. X-ray diffraction …

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Mechanically induced tilt in smectic-A elastomers

Kramer, Dominic; Finkelmann, Heino
Soft Matter, 2011

Recently it has been predicted that shear forces can unlock the director and the layer normal in smectic-A elastomers, leading to a smectic-C like tilt analogous to the electroclinic effect of chiral SA* phases. …

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Perforated lamellae morphology in novel P2VP (PDMS-b-PI-b-PS) 2 3-miktoarm star quarterpolymer

Kirkensgaard, Jacob Judas Kain; Fragouli, Panagiota; Hadjichristidis, Nikos; Mortensen, Kell
Macromolecules, 2011

The melt morphology of a novel P2VP(PDMS-b-PI-b-PS)2 3-miktoarm star quarterpolymer is investigated. The melt morphology is determined using rheology and small-angle neutron and X-ray scattering data in conjunction with dissipative particle dynamics …

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Shear deformation and ferroelectricity in chiral SmC* main-chain elastomers

Heinze, Patrick; Finkelmann, Heino
Macromolecules, 2010

Ferroelectric smectic main-chain liquid crystalline elastomers were synthesized and subjected to simple shear deformation to achieve reorientation of the layer structure and the formation of a macroscopic spontaneous polarization. The phase behavior …

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Formation of liquid crystalline phases in aqueous suspensions of platelet-like tripalmitin nanoparticles

Schmiele, Martin; Gehrer, Simone; Westermann, Martin; Steiniger, Frank; Unruh, Tobias
The Journal of Chemical Physics, 2014

Suspensions of platelet-like shaped tripalmitin nanocrystals stabilized by the pure lecithin DLPC and the lecithin blend S100, respectively, have been studied by small-angle x-ray scattering(SAXS) and optical observation of their birefringence at different tripalmitin …

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