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828 Aktuelle Fachpublikationen zum Thema temperature

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Temperature-Induced Assembly of Monodisperse, Covalently Cross-Linked, and Degradable Poly(N-isopropylacrylamide) Microgels Based on Oligomeric Precursors

21.05.2015 | Daryl Sivakumaran; Eva Mueller; Todd Hoare, Langmuir, 2015

A simple, rapid, solvent-free, and scalable thermally driven self-assembly approach is described to produce monodisperse, covalently cross-linked, and degradable poly(N-isopropylacrylamide) (PNIPAM) microgels based on mixing hydrazide (PNIPAM-Hzd) and aldehyde (PNIPAM-Ald) functionalized PNIPAM ...

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Molecular Dynamics Simulations of CO2/Water/Quartz Interfacial Properties: Impact of CO2 Dissolution in Water

21.05.2015 | Gina Javanbakht; Mohammad Sedghi; William Welch; Lamia Goual, Langmuir, 2015

The safe trapping of carbon dioxide (CO2) in deep saline aquifers is one of the major concerns of CO2 sequestration. The amount of capillary trapping is dominated by the capillary pressure of water and CO2 inside the reservoir, which in turn is controlled by the interfacial tension (IFT) and the ...

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CO2-Controllable Foaming and Emulsification Properties of the Stearic Acid Soap Systems

20.05.2015 | Wenlong Xu; Hongyao Gu; Xionglu Zhu; Yingping Zhong; Liwen Jiang; Mengxin Xu; Aixin Song; Jingcheng Hao, Langmuir, 2015

Fatty acids, as a typical example of stearic acid, are a kind of cheap surfactant and have important applications. The challenging problem of industrial applications is their solubility. Herein, three organic amines—ethanolamine (EA), diethanolamine (DEA), and triethanolamine (TEA)—were used as ...

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Effect of Poly(ethylene oxide) Molecular Weight on the Pinning and Pillar Formation of Evaporating Sessile Droplets: The Role of the Interface

18.05.2015 | Dimitrios Mamalis; Vasileios Koutsos; Khellil Sefiane; Antonia Kagkoura; Michail Kalloudis; Martin E. R. Shanahan, Langmuir, 2015

We report on the drying process of sessile droplets of aqueous poly(ethylene oxide) (PEO) solutions studied by contact angle analysis. Liquid samples were prepared with the same initial concentration of four different molecular weights, Mw, of PEO. Droplets with initial volumes of between 1 and 5 ...

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Selective Tuning of the Self-Assembly and Gelation of a Hydrophilic Poloxamine by Cyclodextrins

13.05.2015 | Gustavo González-Gaitano; Marcelo A. da Silva; Aurel Radulescu; Cécile A. Dreiss, Langmuir, 2015

Complexes formed between cyclodextrins (CDs) and polymers - pseudopolyrotaxanes (PPRs) - are the starting point of a multitude of supramolecular structures, which are proposed for a wide range of biomedical and technological applications. In this work, we investigate the complexation of a range ...

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Decoupling of Mass Transport Mechanisms in the Stagewise Swelling of Multiple Emulsions

07.05.2015 | Jana Bahtz; Deniz Z. Gunes; Eric Hughes; Lea Pokorny; Francesca Riesch; Axel Syrbe; Peter Fischer; Erich J. Windhab, Langmuir, 2015

This contribution reports on the mass transport kinetics of osmotically imbalanced water-in-oil-in-water (W1/O/W2) emulsions. Although frequently studied, the control of mass transport in W1/O/W2 emulsions is still challenging. We describe a microfluidics-based method to systematically ...

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MoS2 Nanoparticles Decorating Titanate-Nanotube Surfaces: Combined Microscopy, Spectroscopy, and Catalytic Studies

07.05.2015 | Sara Cravanzola; Lucia Muscuso; Federico Cesano; Giovanni Agostini; Alessandro Damin; Domenica Scarano; Adriano Zecchina, Langmuir, 2015

MoS2/TNTs composites have been obtained by impregnation of titanate nanotubes (TNTs) with a centrifuged solution of nanosized MoS2 particles in isopropyl alcohol (IPA). The characterization has been performed by combining UV–vis–NIR, Raman, AFM, and HRTEM analyses, before and after impregnation. ...

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β-Relaxation of PMMA: Tip Size and Stress Effects in Friction Force Microscopy

07.05.2015 | Johannes Sondhauß; Mark Lantz; Bernd Gotsmann; André Schirmeisen, Langmuir, 2015

The kinetic signature of the β-relaxation of poly(methyl methacrylate) (PMMA) is investigated by friction force microscopy. The variation in friction force was measured as a function of scan velocity, temperature (300 K–410 K), and applied load using both sharp and blunt probe tips. The friction ...

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Mussel-Adhesive-Inspired Fabrication of Multifunctional Silver Nanoparticle Assemblies

06.05.2015 | Shuqiang Xiong; Yan Wang; Jing Zhu; Junrong Yu; Zuming Hu, Langmuir, 2015

The assembly of metal nanoparticles (NPs) has attracted a great deal of attention recently because of their collective properties that could not be exhibited by individual NPs. Here a one-step approach was reported for the fabrication of spherical silver NP assemblies (AgNAs). The formation of ...

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Water Uptake and Swelling Hysteresis in a Nafion Thin Film Measured with Neutron Reflectometry

04.05.2015 | W. Peter Kalisvaart; Helmut Fritzsche; Walter Mérida, Langmuir, 2015

Water uptake and swelling in a thin (∼15 nm) Nafion film on SiO2 native oxide on a Si wafer is studied as a function of relative humidity (8–97%) at room temperature and as a function of temperature (25–60 °C) at 97% relative humidity by neutron reflectometry. This is the first report on the ...

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