000819854 001__ 819854
000819854 005__ 20240619083527.0
000819854 0247_ $$2Handle$$a2128/12842
000819854 037__ $$aFZJ-2016-05433
000819854 041__ $$aEnglish
000819854 1001_ $$0P:(DE-Juel1)131034$$aWiegand, Simone$$b0$$eCorresponding author$$ufzj
000819854 1112_ $$aKolloquium, Waseda University$$cTokyo$$d2016-09-30 - 2016-09-30$$wJapan
000819854 245__ $$aThermal gradients in aqueous soft matter systems$$f2016-09-30 - 
000819854 260__ $$c2016
000819854 3367_ $$033$$2EndNote$$aConference Paper
000819854 3367_ $$2DataCite$$aOther
000819854 3367_ $$2BibTeX$$aINPROCEEDINGS
000819854 3367_ $$2ORCID$$aLECTURE_SPEECH
000819854 3367_ $$0PUB:(DE-HGF)31$$2PUB:(DE-HGF)$$aTalk (non-conference)$$btalk$$mtalk$$s1479288490_29807$$xInvited
000819854 3367_ $$2DINI$$aOther
000819854 520__ $$aIn many experimental situations temperature gradients play an important role. For almost one century thermogravitational columns and thermal field flow fractionation channels have been used for separation and characterization of soft matter [1]. Presently researchers design synthetic microswimmers, micromotors, or micropumps to explore possibilities to recycle waste heat using such microfluidic devices [2]. So far there is only a limited microscopic understanding of thermodiffusion or thermophoresis in simple and complex fluids. In the recent years some progress has been made for non-polar systems, but in aqueous systems the situation is complicated due to charge effects and strong specific cross interactions so that simple thermodynamic concepts fail. On the other hand a detailed understanding of aqueous systems would be valuable due to important applications in biotechnology, where the response to temperature gradients is successfully employed to monitor the reaction kinetics of large proteins with small ligand molecules. The strong sensitivity of proteins and other water soluble biomolecules is probably caused by a change in the hydration layer, which is influenced by subtle conformation changes induced by the binding of the ligand molecule. To get a better understanding we systematically investigated various small water soluble molecules, microemulsions and colloids by a holographic grating method called infrared thermal diffusion forced Rayleigh scattering (IR-TDFRS). In order to elucidate the mechanism in biomolecules we performed systematic measurements of amides, which often serve as model systems for peptide bonds, an essential structure in proteins. Using the experimental data determined for fomamide we perform numerical finite-element simulations in hydrothermal pores and show that a combination of thermophoresis and convection can lead to accumulation of formamide up to concentrations where nucleobases are formed [3], which might serve as an ‘origin-of-life’ scenario. Further we study microemulsion droplets as soft colloids to investigate the relation between the interfacial tension and the Soret coefficient [4]. Other important contributions in aqueous systems are charge effects, which we study systematically for colloidal model systems. Using a theoretical model by Dhont and Briels [5] valid for spherical charged colloids with arbitrary double-layer thicknesses we are able to calculate the surface charge density of the colloid. It turns out that the surface charge density agrees well with electrophoresis measurements. The same holds for an extended model for charged colloidal rods [6]. [1] Wiegand, S., in Functional Soft Matter, J.K.G. Dhont, et al., Editors. 2015, Forschungszentrum Jülich. F4.[2] Ripoll, M. and Yang, M.C., in World Scientific Lecture Notes in Complex Systems - Vol. 12Engineering of Chemical Complexity II (2015) 109.[3] Niether, D., Afanasenkau, D., Dhont, J.K.G. and Wiegand, S. , PNAS, 113 (2016) 4272.[4] Naumann, Ph., Datta, S., Sottmann, T., Arlt, B., Frielinghaus, H., Wiegand, S., J . Phys. Chem. B, 118 (2014) 3451.[5] Dhont, J.K.G.  and Briels, W.J., Eur. Phys. J. E, 25 (2008) 61.[6] Wang, Z., Kriegs, H., Buitenhuis, J., Dhont, J.K.G., Wiegand, S., Soft Matter, 9 (2013) 8697.
000819854 536__ $$0G:(DE-HGF)POF3-551$$a551 - Functional Macromolecules and Complexes (POF3-551)$$cPOF3-551$$fPOF III$$x0
000819854 65027 $$0V:(DE-MLZ)SciArea-210$$2V:(DE-HGF)$$aSoft Condensed Matter$$x0
000819854 65017 $$0V:(DE-MLZ)GC-1602-2016$$2V:(DE-HGF)$$aPolymers, Soft Nano Particles and  Proteins$$x0
000819854 8564_ $$uhttps://juser.fz-juelich.de/record/819854/files/abstract-visit-TABE-lab-final.pdf$$yOpenAccess
000819854 8564_ $$uhttps://juser.fz-juelich.de/record/819854/files/abstract-visit-TABE-lab-final.gif?subformat=icon$$xicon$$yOpenAccess
000819854 8564_ $$uhttps://juser.fz-juelich.de/record/819854/files/abstract-visit-TABE-lab-final.jpg?subformat=icon-1440$$xicon-1440$$yOpenAccess
000819854 8564_ $$uhttps://juser.fz-juelich.de/record/819854/files/abstract-visit-TABE-lab-final.jpg?subformat=icon-180$$xicon-180$$yOpenAccess
000819854 8564_ $$uhttps://juser.fz-juelich.de/record/819854/files/abstract-visit-TABE-lab-final.jpg?subformat=icon-640$$xicon-640$$yOpenAccess
000819854 8564_ $$uhttps://juser.fz-juelich.de/record/819854/files/abstract-visit-TABE-lab-final.pdf?subformat=pdfa$$xpdfa$$yOpenAccess
000819854 909CO $$ooai:juser.fz-juelich.de:819854$$pdriver$$pVDB$$popen_access$$popenaire
000819854 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)131034$$aForschungszentrum Jülich$$b0$$kFZJ
000819854 9131_ $$0G:(DE-HGF)POF3-551$$1G:(DE-HGF)POF3-550$$2G:(DE-HGF)POF3-500$$3G:(DE-HGF)POF3$$4G:(DE-HGF)POF$$aDE-HGF$$bKey Technologies$$lBioSoft – Fundamentals for future Technologies in the fields of Soft Matter and Life Sciences$$vFunctional Macromolecules and Complexes$$x0
000819854 9141_ $$y2016
000819854 915__ $$0StatID:(DE-HGF)0510$$2StatID$$aOpenAccess
000819854 920__ $$lyes
000819854 9201_ $$0I:(DE-Juel1)ICS-3-20110106$$kICS-3$$lWeiche Materie $$x0
000819854 9801_ $$aFullTexts
000819854 980__ $$atalk
000819854 980__ $$aVDB
000819854 980__ $$aUNRESTRICTED
000819854 980__ $$aI:(DE-Juel1)ICS-3-20110106