Browsing by Author "Volkmann, Ulrich"
Now showing 1 - 20 of 54
Results Per Page
Sort Options
- ItemAccessing the structural and thermodynamic properties of ultra-thin layers of C32 adsorbed on a SiO2 surface(2017) Gutiérrez Maldonado, Sebastián E.; Gárate, José Antonio; Retamal Ponce, María José; Cisternas, Marcelo A.; Volkmann, Ulrich; Pérez Acle, Tomás
- 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.
- ItemDipolar and quadrupolar freezing in (KBr)1-x(KCN)x(1986) Volkmann, Ulrich; Böhmer, R.; Loidl, A.; Knorr, K.; Höchli, U.T.; Haussühl, S.
- ItemDry two-step self-assembly of stable supported lipid bilayers on silicon substrates(2020) Cisternas Fruns, Marcelo Andrés; Palacios-Coddou, F.; Molina, S.; Retamal Ponce, María José; Gómez Vierling, Nancy Catalina; Moraga Alarcón, Nicolás; Zelada, H.; Soto Arriaza, Marco; Corrales, T. P.; Volkmann, Ulrich
- ItemEasy axis magnetization reversal in cobalt antidot arrays(2008) Mengotti, E.; Matelon, R. J.; Volkmann, Ulrich
- ItemEllipsometric study of krypton physisorbed on graphite(1989) Volkmann, Ulrich; Knorr, K.
- 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.
- ItemEllipsometric thickness and coverage of physisorbed layers of Xe, Kr, Ar and N2 on graphite(1990) Faul, J.W.O.; Volkmann, Ulrich; Knorr, K.
- ItemFerroelectric Properties of Flash Evaporated Barium Titanate Thin Films(2004) Zarate, R.; Cabrera, Alejandro Leopoldo; Volkmann, Ulrich
- ItemFormación y transiciones de fase de bicapas lipídicas depositadas desde su fase de vapor sobre sustratos de silicio poroso.(2020) Moraga Alarcón, Nicolás; Volkmann, Ulrich; Pontificia Universidad Católica de Chile. Instituto de Física
- ItemGrowth of n-Alkane Films on a Single-Crystal Substrate(2001) Wu, Z.; Volkmann, Ulrich
- ItemGrowth Studies of Thin Films of BaTiO3 Using Flash Evaporation(1998) Zarate, R.; Cabrera, Alejandro Leopoldo; Volkmann, Ulrich
- ItemHíbridos de polímero - nanopartículas metálicas (Chile, concesión n° 61978)González Enríquez, Carmen; Terraza Inostroza, Claudio; Volkmann, Ulrich; Cabrera, Alejandro Leopoldo; Retamal Ponce, María José
- Item
- ItemInclusion effect of gold and copper particles in a poly(amide) matrix that contains a thiophene moiety and Si or Ge atoms in the main chain(2012) González Enríquez, Carmen; Terraza Inostroza, Claudio; Tagle Domínguez, Luis Hernán; Barriga Gonzalez, Andres; Volkmann, Ulrich; Cabrera, Alejandro Leopoldo; Ramos Moore, Esteban; Retamal Ponce, María José
- 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
- «
- 1 (current)
- 2
- 3
- »