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Large-Area Nanoparticle Films by Continuous Automated Langmuir–Blodgett Assembly and Deposition

29-Jan-2016 | Xue Li; James F. Gilchrist, Langmuir, 2016

The operating parameters and resulting surface morphology of automated Langmuir–Blodgett deposition of monosized micrometer-scale silica colloids from an aqueous suspension are investigated. This apparatus allows continuous roll-to-roll deposition of particles into well-ordered arrays. The ...

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Self-Assembly of Nanoparticle–Surfactant Complexes with Rodlike Micelles: A Molecular Dynamics Study

28-Jan-2016 | Abhinanden Sambasivam; Ashish. V. Sangwai; Radhakrishna Sureshkumar, Langmuir, 2016

The self-assembly of nanoparticles (NPs) with cationic micelles of cetyltrimethylammonium chloride (CTAC) is known to produce stable nanogels with rich rheological and optical properties. Coarse-grained molecular dynamics (MD) simulations are performed to explore the molecular mechanisms ...

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Nature of the Intermicellar Interactions in Ethoxylated Polysorbate Surfactants with High Degrees of Ethoxylation

26-Jan-2016 | J. Penfold; R. K. Thomas; P. X. Li; I. Tucker; J. Petkov; R. E. Petkova, Langmuir, 2016

Ethoxylated polysorbate Tween nonionic surfactants are extensively used as foam and emulsion stabilizers and in aqueous solution form globular micelles. The ethoxylated polysorbate surfactants with higher degrees of ethoxylation than the Tween surfactants exhibit some interesting self-assembly ...

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Stabilization of Water-in-Water Emulsions by Polysaccharide-Coated Protein Particles

26-Jan-2016 | Rilton A. de Freitas; Taco Nicolai; Christophe Chassenieux; Lazhar Benyahia, Langmuir, 2016

The phase diagram of mixtures of xyloglucan (XG) and amylopectin (AMP) in aqueous solution is presented. Water-in-water emulsions prepared from mixtures in the two-phase regime were studied in detail, and the interfacial tension was determined. It is shown that the emulsions can be stabilized by ...

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Ionic Conductivity as a Tool To Study Biocidal Activity of Sulfobetaine Micelles against Saccharomyces cerevisiae Model Cells

25-Jan-2016 | Matteo Tiecco; Luca Roscini; Laura Corte; Claudia Colabella; Raimondo Germani; Gianluigi Cardinali, Langmuir, 2016

Zwitterionic sulfobetaine surfactants are used in pharmaceutical or biomedical applications for the solubilization and delivery of hydrophobic molecules in aqueous medium or in biological environments. In a screening on the biocidal activity of synthetic surfactants on microbial cells, remarkable ...

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Capillary Penetration into Inclined Circular Glass Tubes

25-Jan-2016 | Christophe L. Trabi; F. Fouzia Ouali; Glen McHale; Haadi Javed; Robert H. Morris; Michael I. Newton, Langmuir, 2016

The spontaneous penetration of a wetting liquid into a vertical tube against the force of gravity and the imbibition of the same liquid into a horizontal tube (or channel) are both driven by capillary forces and described by the same fundamental equations. However, there have been few ...

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Identification of Dewetting Stages and Preparation of Single Chain Gold Nanoparticle Rings by Colloidal Lithography

21-Jan-2016 | Norbert Nagy; Dániel Zámbó; Szilárd Pothorszky; Eszter Gergely-Fülöp; András Deák, Langmuir, 2016

Massively parallel nanoparticle assembly was carried out by means of colloidal lithographic experiments over a silicon substrate supported (sub)microparticle Langmuir–Blodgett monolayer, using high purity aqueous solution of PEGylated gold nanoparticles. The size of the polystyrene template ...

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Temperature-Induced Aggregate Transitions in Mixtures of Cationic Ammonium Gemini Surfactant with Anionic Glutamic Acid Surfactant in Aqueous Solution

21-Jan-2016 | Xiuling Ji; Maozhang Tian; Yilin Wang, Langmuir, 2016

The aggregation behaviors of the mixtures of cationic gemini surfactant 1,4-bis(dodecyl-N,N-dimethylammonium bromide)-2,3-butanediol (C12C4(OH)2C12Br2) and anionic amino acid surfactant N-dodecanoylglutamic acid (C12Glu) in aqueous solution of pH = 10.0 have been studied. The mixture forms ...

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Triphenylene-Based Room-Temperature Discotic Liquid Crystals: A New Class of Blue-Light-Emitting Materials with Long-Range Columnar Self-Assembly

20-Jan-2016 | Monika Gupta; Santanu Kumar Pal, Langmuir, 2016

A straightforward synthesis of multialkynylbenzene-bridged triphenylene-based dyad systems (via flexible alkyl spacers) that self-organize into room-temperature columnar structures over a long range is reported. The compounds with spacer lengths (n) of 8 and 10 exhibit a columnar rectangular ...

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Effects of Complementary DNA and Salt on the Thermoresponsiveness of Poly(N-isopropylacrylamide)-b-DNA

20-Jan-2016 | Masahiro Fujita; Hayato Hiramine; Pengju Pan; Takaaki Hikima; Mizuo Maeda, Langmuir, 2016

The thermoresponsive structural transition of poly(N-isopropylacrylamide) (PNIPAAm)-b-DNA copolymers was explored. Molecular assembly of the block copolymers was facilitated by adding salt, and this assembly was not nucleated by the association between DNA strands but by the coil–globule ...

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