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12,315 Newest Publications in langmuir

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Study of Optical and Magnetic Properties of Graphene-Wrapped ZnO Nanoparticle Hybrids

17-Jan-2018 | Arpita Jana; Elke Scheer, Langmuir, 2018

In this work, we report a one-step method for the preparation of graphene-wrapped zinc oxide (ZnO) nanoparticle (NP) (ZnO@G) hybrids. These hybrids are characterized by transmission electron microscopy, X-ray diffraction, Raman spectroscopy, optical absorption measurements, photoluminescence (PL) ...

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Hierarchically Patterned Noncovalent Functionalization of 2D Materials by Controlled Langmuir–Schaefer Conversion

17-Jan-2018 | Tyson C. Davis; Jae Jin Bang; Jacob T. Brooks; David G. McMillan; Shelley A. Claridge, Langmuir, 2018

Noncovalent monolayer chemistries are often used to functionalize 2D materials. Nanoscopic ligand ordering has been widely demonstrated (e.g., lying-down lamellar phases of functional alkanes); however, combining this control with micro- and macroscopic patterning for practical applications ...

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Self-Assembly of Lysine-Based Dendritic Surfactants Modeled by the Self-Consistent Field Approach

17-Jan-2018 | O. V. Shavykin; F. A. M. Leermakers; I. M. Neelov; A. A. Darinskii, Langmuir, 2018

Implementing a united atom model, we apply self-consistent field theory to study structure and thermodynamic properties of spherical micelles composed of surfactants that combine an alkyl tail with a charged lysine-based dendritic headgroup. Following experiments, the focus was on dendron ...

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Aggregate Size Dependence of Amyloid Adsorption onto Charged Interfaces

17-Jan-2018 | Giulio Tesei; Erik Hellstrand; Kalyani Sanagavarapu; Sara Linse; Emma Sparr; Robert Vácha; Mikael Lund, Langmuir, 2018

Amyloid aggregates are associated with a range of human neurodegenerative disorders, and it has been shown that neurotoxicity is dependent on aggregate size. Combining molecular simulation with analytical theory, a predictive model is proposed for the adsorption of amyloid aggregates onto ...

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Shear-Induced Migration of Rigid Particles near an Interface between a Newtonian and a Viscoelastic Fluid

17-Jan-2018 | Nick. O. Jaensson; Christos Mitrias; Martien A. Hulsen; Patrick D. Anderson, Langmuir, 2018

Simulations of rigid particles suspended in two-phase shear flow are presented, where one of the suspending fluids is viscoelastic, whereas the other is Newtonian. The Cahn–Hilliard diffuse-interface model is employed for the fluid–fluid interface, which can naturally describe the interactions ...

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Observation of Dynamic Surfactant Adsorption Facilitated by Divalent Cation Bridging

17-Jan-2018 | Chase T. Gerold; Charles S. Henry, Langmuir, 2018

Dynamic evidence of the mechanism for surfactant adsorption to surfaces of like charge has been observed. Additionally, removal and retention of surfactant molecules on the surface were observed as a function of time. A decrease in surface charge is observed when metal counterions are introduced ...

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Perpendicular Orientation of Diblock Copolymers Induced by Confinement between Graphene Oxide Sheets

17-Jan-2018 | Ki-In Choi; Tae-Ho Kim; Yeonhee Lee; Hyeri Kim; Hoyeon Lee; Guangcui Yuan; Sushil K. Satija; Jae-Hak Choi; Hyungju A ..., Langmuir, 2018

We have studied an orientation structure of self-assembled block copolymers (dPS-b-PMMA) of deuterated polystyrene (dPS) and poly(methyl methacrylate) (PMMA) confined between graphene oxide (GO) surfaces. The results of combination techniques, such as neutron reflectivity, time-of-flight ...

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Dewetting of Thin Liquid Films Surrounding Air Bubbles in Microchannels

17-Jan-2018 | S. Khodaparast; O. Atasi; A. Deblais; B. Scheid; H. A. Stone, Langmuir, 2018

As an air bubble translates in a microchannel, a thin film of liquid is formed on the bounding walls. In a microchannel with a rectangular cross-section, the liquid in the film leaks toward the low-pressure corners of the geometry, which leads to the appearance of local minima in the film ...

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Accelerated Transport of Particles in Confined Channels with a High Roughness Amplitude

17-Jan-2018 | Hubert Ranchon; Jean Cacheux; Benjamin Reig; Olivier Liot; Pattamon Teerapanich; Thierry Leichlé; Pierre Joseph; Aur ..., Langmuir, 2018

We investigate the pressure-driven transport of particles 200 or 300 nm in diameter in shallow microfluidic channels ∼1 μm in height with a bottom wall characterized by a high roughness amplitude of ∼100 nm. This study starts with the description of an assay to generate cracks in hydrophilic thin ...

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Droplet Demulsification Using Ultralow Voltage-Based Electrocoalescence

17-Jan-2018 | A. Srivastava; S. Karthick; K. S. Jayaprakash; A. K. Sen, Langmuir, 2018

Demulsification of droplets stabilized with surfactant is very challenging due to their low surface energy. We report ultralow voltage-based electrocoalescence phenomenon for the demulsification of aqueous droplets with an aqueous stream. In the absence of electric field, due to the disjoining ...

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