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743 Aktuelle Fachpublikationen zum Thema temperature

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Molecular Structure of Poly(methyl methacrylate) Surface II: Effect of Stereoregularity Examined through All-Atom Molecular Dynamics

24.10.2014 | Kshitij C. Jha; He Zhu; Ali Dhinojwala; Mesfin Tsige, Langmuir, 2014

Utilizing all-atom molecular dynamics (MD), we have analyzed the effect of tacticity and temperature on the surface structure of poly(methyl methacrylate) (PMMA) at the polymer–vacuum interface. We quantify these effects primarily through orientation, measured as the tilt with respect to the ...

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Spectroscopic Investigation of the Wettability of Multilayer Graphene Using Highly Ordered Pyrolytic Graphite as a Model Material

23.10.2014 | Ali Ashraf; Yanbin Wu; Michael C. Wang; Narayana R. Aluru; Seyed A. Dastgheib; SungWoo Nam, Langmuir, 2014

We report the intrinsic water contact angle (WCA) of multilayer graphene, explore different methods of cleaning multilayer graphene, and evaluate the efficiency of those methods on the basis of spectroscopic analysis. Highly ordered pyrolytic graphite (HOPG) was used as a model material system to ...

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Structure of Adsorption Layer of Silver Nanoparticles in Sodium Bis(2-ethylhexyl) Sulfosuccinate Solutions in n-Decane As Observed by Photon-Correlation Spectroscopy and Nonaqueous Electrophoresis

20.10.2014 | Alexander I. Bulavchenko; Pavel S. Popovetskiy, Langmuir, 2014

Photon correlation spectroscopy, nonaqueous electrophoresis, and transmission electron microscopy were used to study the structure of silver nanoparticles (NPs) in n-decane, as a dependence of the concentration of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and temperature. If the concentration ...

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Spontaneous Formation of Photochromic Coatings Made of Reversible Microfibrils and Nanofibrils on an Elastomer Substrate

20.10.2014 | Reinier Oropesa-Nuñez; Despina Fragouli; Francesca Pignatelli; Alice Scarpellini; Efisio Gigliotti; Elena Samoylova; ..., Langmuir, 2014

We report the spontaneous formation of photochromic microcrystalline and nanocrystalline fibrils forming dense coatings of cactuslike supramolecular structures on the surface of a soft poly(dimethylsiloxane) (PDMS) elastomer. The initial deposition of the photochromic molecules of diarylethenes ...

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Liquid Marbles Stabilized by Charged Polymer Latexes: How Does the Drying of the Latex Particles Affect the Properties of Liquid Marbles?

16.10.2014 | Guanqing Sun; Yifeng Sheng; Jie Wu; Guanghui Ma; To Ngai, Langmuir, 2014

The coating of solid particles on the surface of liquid in air makes liquid marbles a promising approach in the transportation of a small amount of liquid. The stabilization of liquid marbles by polymeric latex particles imparts extra triggers such as pH and temperature, leading to the remote ...

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Room Temperature Growth of Ultrathin Au Nanowires with High Areal Density over Large Areas by in Situ Functionalization of Substrate

16.10.2014 | Subhajit Kundu; Annamalai Leelavathi; Giridhar Madras; N. Ravishankar, Langmuir, 2014

Although ultrathin Au nanowires (∼2 nm diameter) are expected to demonstrate several interesting properties, their extreme fragility has hampered their use in potential applications. One way to improve the stability is to grow them on substrates; however, there is no general method to grow these ...

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Physicochemical Behaviors of Cationic Gemini Surfactant (14-4-14) Based Microheterogeneous Assemblies

13.10.2014 | Sibani Das; Indrajyoti Mukherjee; Bidyut K. Paul; Soumen Ghosh, Langmuir, 2014

A comprehensive study of micellization and microemulsion formation of a cationic gemini surfactant (tetramethylene-1,4-bis(dimethyltetradecylammonium bromide; 14-4-14) in the absence or presence of hydrophobically modified polyelectrolyte, sodium carboxymethylcellulose (NaCMC), has been conducted ...

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Smart Polymer Nanoparticles for High-Performance Water-Borne Coatings

07.10.2014 | Susana Piçarra; Alexandra Fidalgo; Aleksander Fedorov; José M. G. Martinho; José Paulo S. Farinha, Langmuir, 2014

Poly(butyl methacrylate) nanoparticles encapsulating a silica precursor, tetraethoxysilane (TEOS), were synthesized by a two-step emulsion polymerization process. We show that TEOS remains mostly unreacted inside the nanoparticles in water but acts both as a plasticizer and cross-linker in films ...

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Adsorption of Zwitterionic Surfactant on Limestone Measured with High-Performance Liquid Chromatography: Micelle–Vesicle Influence

06.10.2014 | David Aaron Nieto-Alvarez; Luis S. Zamudio-Rivera; Erick E. Luna-Rojero; Dinora I. Rodríguez-Otamendi; Adlaí Marín-L ..., Langmuir, 2014

Herein is presented a new methodology to determine the static adsorption of a zwitterionic surfactant on limestone in three different aqueous media [high-performance liquid chromatography (HPLC) water, seawater, and connate water] with the use of HPLC at room temperature and 70 °C. The results ...

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Gold Complexes for Focused-Electron-Beam-Induced Deposition

01.10.2014 | W. F. van Dorp; X. Wu; J. J. L. Mulders; S. Harder; P. Rudolf; J. T. M. De Hosson, Langmuir, 2014

Four gold complexes were tested as a precursor for focused-electron-beam-induced deposition: [ClAuIIIMe2]2, ClAuI(SMe2), ClAuI(PMe3), and MeAuI(PMe3). Complexes [ClAuIIIMe2]2 and MeAuI(PMe3) are volatile, have sufficient vapor pressure at room temperature for deposition experiments, and were ...

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