Site blog: CoWet

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The objective of the study will be investigations of wettability and topography of mixed lipid layers surface and their electrokinetic properties, especially in the presence of enzymes and antioxidants. Also the study of effects of lipids as bio-surfactants on stability of dispersions is of our interest. Both the monolayers spread on a liquid subphase (e.g. water), i.e. Langmuir films, as well the layers transferred onto a solid support (mica, silicon, glass, gold, polymer, and others) called as the Langmuir-Blodgett films are a subject of our study. The wettability of solid supported films is investigated via measurement of advancing and receding contact angles. Having the contact angle values and applying suitable theoretical model it is possible to calculate the film apparent surface free energy. To get more information about properties of the layers topography of their surface is determined using optical and spectroscopic methods, like AFM, TEM, SEM, optical profilometry, Raman spectroscopy, and others. Tracking the changes in the energy caused by enzymatic hydrolysis reaction, it is possible to produce the surface of desired hydrophobic/hydrophilic property. The properties of lipid liposomes are also investigated, among other methods, by measuring their size and size distribution, electrokinetic potential, and adhesion to the solid supported lipid films or to mineral nanoparticles disperssed in the system. It should be also mentioned that not only wetting properties of these systems are studied but also other solid surfaces, also those modified by plasma treatment, including the deposited lipid films. The plasma treatment usually causes an increase in the surface hydrophilicity. In the case of polymer surface such treatment may enforce adhesion of polar nano- and/or micro- particles. This can allow preparation of the superhydrophobic surfaces. Thus, it is clearly seen that there are many issues dealing with these systems which interesting for investigations and which can be a subject of PhD study. The position is available starting from January 1, 2014. Applications are welcomed from candidates possessing Master Degree in Chemical Engineering, Chemistry, Physical Chemistry, Biology or related fields and having a strong interest in computational work. The candidate besides Master Degree in above mentioned disciplines (Chemistry, Physics, Chemical Engineering, etc.), should be fluent in English, and preferably should have some background in Colloids and Interfaces. Please send your application including CV, motivation letter and transcript of academic records to Prof. Emil Chibowski (emil.chibowski@umcs.pl) or Dr. Aleksandra Szczes (aszczes@umcs.pl). The policy of equal opportunities will be followed during the recruitment. Eligibility criteria The master title at the time of recruitment should be not older than four years.
[ Modified: Friday, 9 January 2015, 4:32 PM ]

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    Anyone in the world

    The Early Stage Researcher (ESR) will work on the Work Package “Dynamic interfacial tension and surfactant stabilisation during membrane emulsification: how to avoid drop coalescence and membrane wetting”. The objective of his or her PhD project is to contribute towards the understanding, modelling and prediction of membrane emulsification processes by focusing on the interaction of complex liquid systems with the porous membrane used to create the emulsion, and interfacial tension variations due to the growing emulsion droplet being formed at the membrane surface.

    The position is available from January (or later if required), 2014. Applications are invited from candidates with a Master degree in Chemical Engineering, Mechanical Engineering, Physical Chemistry, Physics or related field and having a strong ability for numerical as well as experimental work.

    Please send your application including CV, motivation/covering letter and transcript of academic records to Professor Richard Holdich (R.G.Holdich@Lboro.ac.uk) and use ‘CoWet Application’ as the subject header for the message. The policy of equal opportunities will be followed during the recruitment.

     

    Eligibility criteria

    The master title at the time of recruitment should be not older than four years.

    At the time of recruitment the researcher should not have resided or carried out his or her main activity in The UK for more than 12 months in the 3 years immediately prior to the reference date.

     

    [ Modified: Friday, 13 December 2013, 6:49 PM ]

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      Anyone in the world

      A 24 month postdoc contract is open for carrying out research at Complutense University of Madrid (Spain) as part of a Marie Curie training network of the VII Framework Program of the European Union. The position is available starting from January 2014.

      Controlling the spreading of complex fluids on micro- and nanostructured substrates is a great challenge at the crossroad of Mathematics, Physics, Chemistry and Engineering/Industry. Complex liquids are structured at different length scales and thus have various internal degrees of freedom, e.g. dispersions, polymer melts or solutions, surfactant solutions, emulsions and foams. Complex surfaces include solid or soft substrates showing ordered or random topological patterns, chemical heterogeneities, porosity with typical length scales in the micro- or nanometer range, adaptable or switchable coatings and viscoelastic substrates. The work will include also the characterization of the behavior of both the liquid/solid and the liquid/vapor interfaces. The project includes both experimental and theoretical developments. The project will be carried out in cooperation with groups at Loughborough University (U.K.) and Max Planck Institute of Polymers (Mainz, Germany) and of Colloids and Interfaces (Potsdam-Golm, Germany)

      Detailed information about available projects can be found at the websites:

      cowet.eu

      http://www.cowet.tu-darmstadt.de

      Experienced researchers (ERs) shall at the time of recruitment by the host organisation be in possession of a doctoral degree or have at least four years of full-time equivalent research experience. In ITN, experienced researchers shall also, at the time of recruitment by the host organization, have less than five years experience of full-time equivalent research experience.

      Full-time equivalent research experience is measured from the date when a researcher obtained the degree which would formally entitle him or her to embark on a doctorate, either in the country in which the degree was obtained or in the country in which the researcher is recruited, irrespective of whether or not a doctorate is or was ever envisaged.

      At the time of recruitment by the host organization researchers shall not have resided or carried out their main activity (work, studies, etc.) in the country of their host organization for more than 12 months in the 3 years immediately prior to the reference date. Compulsory national service and/or short stays such as holidays are not taken into account. Salary is fixed by the Marie Curie Program.

       

      Contact: Prof. Ramon G. Rubio, rgrubio@quim.ucm.es; Prof. Manuel G. Velarde, mgvelarde@pluri.ucm.es.

      www.ucm.es/info/gsc; http://www.ucm.es/info/fluidos.

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        Anyone in the world

        Monolayers at liquid/air and liquid/liquid interfaces play a key role in stabilizing complex fluid systems, such as emulsions and foams, as well as in controlling the mass transfer through the interface, e.g. multiphase reactors. Besides interfacial tension, interfacial rheology (both dilational and shear) is known to determine the behavior of systems in which interfaces play an important role.

        During the Ph.D. project the candidate will set-up an equipment for measuring the high-frequency dilational rheology (elasticity and viscosity), and will perform studies of dilational and shear rheology studies of polyelectrolyte + surfactant mixtures of cosmetic interest, and of polyelectrolyte + particle systems. Different experimental techniques already existing in the laboratory will be combined to cover a broad frequency range (0.01 Hz – 2 MHz). Special attention will be paid to the description of the interfacial rheology at low frequencies in the low-frequency range.

        The project will be done in close cooperation with the laboratory of Dr. Reinhard Miller at Max Planck Institute for Colloids and Interfaces (Potsdam-Golm, Germany), where the student will perform some of the experiments. The economic conditions will be those established for Spain by the People Action – Marie Curie Program of the European Union.

        The candidate should hold a Master Degree (Chemistry, Physics, Chemical Engineering), should be fluent in English, and preferably should have some background on Colloids and Interfaces.

        Contact:

        Prof. Ramon G. Rubio

        Department of Physical Chemistry I, Faculty of Chemistry

        Complutense University

        Ciudad Universitaria, 28040-Madrid, Spain.

        Phone: +34-913944123

        Fax: +34-913944135

        E-mail: rgrubio@quim.ucm.es , www.ucm.es/info/gsc

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          Anyone in the world

          The Early Stage Researcher (ESR) will work on the Work Package WP1 “Experimental investigation on dynamic wetting of soluble or deformable substrates”. The objective of this mainly experimental study will be to determine the effect of the deformation, swelling and dissolution of polystyrene substrates in a wetting solvent (toluene) on the wetting dynamics. Fast and slow wetting of polystyrene surfaces will be studied with high speed imaging and with laser scanning confocal microscopy; droplet evaporation will be studied by analysis of the final drop imprints on the polymer surface.

          In fact, an empirical power law describes the dependence of wetting speed on surface wettability for simple liquids and surfaces, but it is not known if this power law is applicable to complex systems as well, e.g. soluble polymer substrates or highly viscous polymer solutions. Also, the initially pure solvent drop will turn into a polymer solution during its spreading – due to solvation of polymer in the solvent – and thus continuously change its composition (concentration, viscosity, surface tension).

          The position is available starting from January 1, 2014. Applications are invited from candidates with Master degree in Physics, Chemistry, Chemical Engineering, or related field and having a strong interest in experimental work at the crossline of disciplines.

          Please send your application including CV, motivation letter and transcript of academic records to Dr. Elmar Bonaccurso (bonaccurso@csi.tu-darmstadt.de). The policy of equal opportunities will be followed during the recruitment.

          Eligibility criteria

          The master title at the time of recruitment should be not older than four years.

          At the time of recruitment the researcher should not have resided or carried out his or her main activity in Germany for more than 12 months in the 3 years immediately prior to the reference date.

          [ Modified: Monday, 15 September 2014, 1:10 PM ]

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            Anyone in the world

            The Early Stage Researcher (ESR) will work on the Work Package WP5 “Numerical simulations of flow driven by wettability: effect of substrate morphology”. The objective of the study will be to simulate numerically the capillary flows which are significantly influenced by the substrate wettability and its morphology. This is a rather challenging problem having numerous practical applications, which requires implementing of new non-standard approaches and ideas. The methods are based on the existing experience of the research group at the Institute of Fluid Mechanics and Aerodynamics (Technische Universität Darmstadt, germany). The simulations will be performed on the base of the OpenFoam platform.

            The position is filled. 

            [ Modified: Thursday, 27 February 2014, 9:04 PM ]

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