1. Structural Properties and Magnetic Ordering in 2D Polymer Nanocomposites: Existence of Long Magnetic Dipolar Chains in Zero Field Author: Christian Appel, Björn Kuttich, Lukas Stühn, Robert W. Stark and Bernd Stühn Journal: Langmuir
DOI: 10.1021/acs.langmuir.9b02094 Abstract: The existence of magnetic dipolar nanoparticle chains at zero ﬁeld has been predicted theoretically for decades, but these structures are rarely observed experimentally. A prerequisite is a permanent magnetic moment on the particles forming the chain. Here we report on the observation of magnetic dipolar chains of spherical iron oxide nanoparticles with a diameter of 12.8 nm. The nanoparticles are embedded in an ultrathin polymer ﬁlm.
2. Tuning the Selectivity and Activity of Electrochemical Interfaces with Defective Graphene Oxide and Reduced Graphene Oxide Authors: Bostjan Genorio, Katharine L. Harrison, Justin G. Connell, Goran Dražić, Kevin R. Zavadil, Nenad M. Markovic and Dusan Strmcnik Journal: ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.9b13391 Abstract: Engineered solid-liquid interfaces will play an important role in the development of future energy storage and conversion (ESC) devices. In the present study, defective graphene oxide (GO) and reduced graphene oxide (rGO) structures were used as engineered interfaces to tune the selectivity and activity of Pt disk electrodes. GO was deposited on Pt electrodes via the Langmuir–Blodgett technique, which provided compact and uniform GO films, and these films were subsequently converted to rGO by thermal reduction. Electrochemical measurements revealed that both GO and rGO interfaces on Pt electrodes exhibit selectivity towards the oxygen reduction reaction (ORR) reaction, but they do not have an impact on the activity of the hydrogen oxidation reaction (HOR) in acidic environments.
3. Enzymatic degradation of the polymer capsules with a hydrophobic core in the presence of Langmuir lipid monolayer as a model of the cellular membrane Authors: Evgenii P.Mironov, Tatiana N.Borodina, Daria G.Yurina, Daria B.Trushina, Tatiana V.Bukreeva Journal: Colloids and Surfaces B: Biointerfaces
DOI: 10.1016/j.colsurfb.2019.110464 Abstract: Submicrocapsules were prepared from diethylaminoethyl dextran (DEAE-D), xanthan gum (XG) and bovine serum albumin (BSA) on oil cores by ultrasonic treatment. These capsules were modified with poly-L-lysine (PLL) via electrostatic adsorption. The behavior of the capsules was investigated at an air–water interface after their introduction into an aqueous subphase. The interaction of the capsules with 1,2-Dimyristoyl-sn-glycero-3-phosphocholine (DMPC) monolayer formed on the water surface (model cellular membrane) was studied both upon their introduction under the condensed monolayer and with the use of a dilute colloidal solution of the capsules as a subphase.
4. Alignment of polymer dispersed nanometric films of ferroelectric liquid crystalline molecules Authors: Ramneek Kaur, Gurpreet Kaur Bhullar, K.K.Raina Journal: Journal of Molecular Liquids
DOI: 10.1016/j.molliq.2019.111664 Abstract: Composite films of polyvinyl alcohol dispersed in ferroelectric liquid crystal (FLC) matrix are fabricated by using Langmuir–Blodgett technique. Pressure–area isotherms show that the composite system formed well aligned monolayer as compared to undoped FLC. Due to molecular interactions, monolayers and multilayers possess good spreading properties and we are able to transfer them onto solid substrates from air-liquid interface.
5. Preparation of Non-Surface-Active Langmuir Trough Subphases from Milk Authors: Luis Real Hernandez and Rafael Jimenez-Flores Journal: ACS omega
DOI: 10.1021/acsomega.9b01659 Abstract: Milk polar lipid interfacial behavior continues to be analyzed using Langmuir trough experiments, but the reported Langmuir trough subphases commonly used are not fully representative of milk. A method to transform liquids of biological origin, such as milk, into appropriate Langmuir trough subphases does not currently exist, which hinders the applicability of Langmuir trough experiments to nature. Here, a procedure to manufacture milk-derived Langmuir trough subphases with insignificant amounts of surfactants from bovine milk is presented. Ultrafiltration is used to remove the bulk of protein surfactants from milk followed by the creation of solvent-induced emulsions that remove trace proteins and lipids from collected skim milk permeates.
6. Textured Manganite Films Anywhere Authors: Alexis Boileau, Marie DALLOCCHIO, Florent Baudouin, Adrian David, Ulrike Lüders, Bernard Mercey, Alain Pautrat, Valerie Demange, Maryline Guilloux-Viry, Wilfrid Prellier and Arnaud Fouchet Journal: ACS Applied Materials & Interfaces
DOI: 10.1021/acsami.9b12209 Abstract: New paradigms are required in microelectronic when the transistor is in its downscaling limit and integration of materials presenting functional properties not available in classical silicon is one of the promising alternatives. Here, we demonstrate the possibility to grow La0.67Sr0.33MnO3 (LSMO) functional materials on amorphous substrate with properties close to films grown on single crystalline substrate by use of a two-dimensional seed layer. X-ray diffraction and electron backscatter diffraction mapping demonstrate that Ca2Nb3O10- nanosheets (NS) layer induces epitaxial stabilization of LSMO films with a strong out-of-plane (001) texture, whereas the growth of LSMO films on uncoated glass substrates exhibit a non-textured polycrystalline phase.