Browsing by Author "Volkmann, Ulrich"
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- ItemAtomic force microscopy study of elastic properties of vapor-phase-deposited lipid membranes(2018) Catalán López, Rodrigo Esteban; Volkmann, Ulrich; Pontificia Universidad Católica de Chile. Facultad de FísicaIn this work we present a study of phase transitions and their relation with the elastic properties of three phospholipid membranes, namely 1,2-dimyristoyl-snglycero-3-phosphocholine (DMPC), 1,2-dipalmitoyl-sn-glycero-3-phosphocholine (DPPC) and 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC). Samples were generated individually by physical-vapor-deposition of the lipid molecules mentioned over acid-cleaned polished silicon chips. The thickness of the samples were measured with Very High Resolution Ellipsometry. Average thickness are 60˚Athickness on average. The molecular consistency of the lipids were characterized using Raman spectroscopy. The Young’s modulus of the lipid membranes was obtained applying the Hertz model to data acquired with Atomic Force Microscopy in Quantitative Imaging feedback mode. Finally, the individual dependence of these lipids respect to temperature changes was used to detect the main gel-to fluid phase transition.The results in the present work show an expected softening of the lipid membranes just after the main phase transition, although the values of the elastic modulus found do not match the ones reported in the literature. However, the general trends correlate well with the ones found in other works. Nevertheless,systematic investigations using similar conditions as ours are still scarce.The acquisition of information related to the elastic properties and stability of the membranes is relevant for future works on protein insertion, and to understand the lipid membranes dependance on several other environmental conditions like changes in temperature, pH-dependence or ionic strength concentration.
- ItemCrystalline-to-plastic phase transitions in molecularly thin n -dotriacontane films adsorbed on solid surfaces(2009) Cisternas Jara, Edgardo A.; Corrales Iturriaga, Tomás Patricio; Del Campo, Valeria; Soza Ossandón, Pamela; Volkmann, Ulrich; Bai, M.; Taub, H.; Hansen, F.Y.
- ItemEllipsometric Study of Multilayer Growth and Wetting of C2 Cl2 F4 Physisorbed on Graphite(1998) Volkmann, Ulrich
- ItemEllipsometric study of multilayer growth and wetting of CClF physisorbed on graphite(1998) Volkmann, Ulrich; Mannebach, H.; Knorr, K.
- ItemFerroelectric Properties of Flash Evaporated Barium Titanate Thin Films(2004) Zarate, R.; Cabrera, Alejandro Leopoldo; Volkmann, Ulrich
- ItemGrowth Studies of Thin Films of Batio3 Using Flash Evaporation(1998) Zarate, R.; Cabrera, Alejandro Leopoldo; Volkmann, Ulrich
- ItemInfluence of TiO2 nanostructures on anti-adhesion and photoinduced bactericidal properties of thin film composite membranes(2016) García, A.; Quintero, Y.; Vicencio, N.; Rodríguez, B.; Ozturk, D.; Mosquera, E.; Corrales, T.; Volkmann, Ulrich
- ItemLocalized diffusive motion on two different time scales in solid alkane nanoparticles(2010) Wang, Sk.; Volkmann, Ulrich
- ItemMagnetooptic Properties of Fe/Pd and Co/Pd Bilayers Under Hydrogen Absorption(2004) Lederman, D.; Volkmann, Ulrich; Cabrera, Alejandro Leopoldo
- ItemModification of the Electrical Resistance of Thin Cobalt Films Upon the Adsorption of Carbon Monoxide(1995) Cabrera, Alejandro Leopoldo; Volkmann, Ulrich
- ItemOptical properties of Pd thin films exposed to hydrogen studied by transmittance and reflectance spectroscopy(2010) Ávila Osses, Jonathan Israel; Matelon, R. J.; Trabol Duarte, Ricardo Alexsis; Favre Domínguez, Mario; Lederman, D.; Volkmann, Ulrich; Cabrera, Alejandro Leopoldo
- ItemSpectrographic phase-retrieval algorithm for femtosecond and attosecond pulses with frequency gaps(2014) Seifert, Birger; Wallentowitz, Sascha; Volkmann, Ulrich
- ItemStructural, optoelectronic and photo-thermoelectric properties of crystalline alloy CuAlxFe1-xO2 delafossite oxide materials(2020) Wheatley, Robert Alastair; Roble Albeal, Martín Cristián; Gence, Loik; Acuña Porras, Camilo; Guzmán de la Cerda, Diego José Edgardo; Vojkovic Lagno, Smiljan Andrej; Seifert, Birger; Wallentowitz, Sascha; Volkmann, Ulrich; Díaz, Donovan; Rojas Aedo, R.; Hidalgo Rojas, D.
- ItemStudies of Carbon Monoxide and Hydrogen Adsorption on Nickel and Cobalt Foils Aimed At Gaining a Better Insight Into the Mechanism of Hydrocarbon Formation(1994) Cabrera, Alejandro Leopoldo; Volkmann, Ulrich
- ItemSurface Morphology of Vapor-Deposited Chitosan : Evidence of Solid-State Dewetting during the Formation of Biopolymer Films(2016) Retamal Ponce, María José; Corrales, Tomás P.; Cisternas, Marcelo; Moraga, Nicolás; Díaz, Diego; Catalán, Rodrigo; Seifert, Birger; Huber, Patrick; Volkmann, Ulrich
- ItemThermogravimetric Measurements of Thin Iron Films Magnetization Near Their Curie Temperature(1995) Cabrera, Alejandro Leopoldo; Volkmann, Ulrich
- ItemUnambiguous ultrashort pulse reconstruction from double spectrograms alone(2016) Seifert, Birger; Wheatley, Robert Alastair; Rojas Aedo, Ricardo; Wallentowitz, Sascha; Volkmann, Ulrich; Sperlich,
- ItemWetting properties of hydrothermally synthesized crystalline CuFeO2 delafossite porous surfaces(2019) Wheatley, Robert Alastair; Roble Albeal, Martín Cristián; Molina, S.; Díaz Droguett, Donovan Enrique; Rojas de la Fuente, Susana Dennis; Seifert, Birger; Wallentowitz, Sascha; Díaz Droguett, D. E.; Volkmann, Ulrich