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Low-Temperature Roll-to-Roll Atmospheric Atomic Layer Deposition of Al2O3 Thin Films

19.11.2014 | Kamran Ali; Kyung-Hyun Choi, Langmuir, 2014

The Al2O3 thin films deposition through conventional ALD systems is a well-established process. The process under low temperatures has been studied by few research groups. In this paper, we report on the detailed study of low-temperature Al2O3 thin films deposited via a unique in-house built ...


Heterogeneous Carbon Gels: N-Doped Carbon Xerogels from Resorcinol and N-Containing Heterocyclic Aldehydes

19.11.2014 | Wojciech Kiciński; Małgorzata Norek; Bartłomiej J. Jankiewicz, Langmuir, 2014

Direct, acid (HCl) initiated sol–gel polycondensation of resorcinol with pyrrole-2-carboxaldehyde or its derivative N-methyl-2-pyrrolecarboxaldehyde yields thermosetting phenolic organic gels with N-content of up to 8.4 wt %. After carbonization, sturdy monoliths of N-doped carbon xerogels with ...


The Complex Polymorphism and Thermodynamic Behavior of a Seemingly Simple System: Naphthalene on Cu(111)

17.11.2014 | Roman Forker; Julia Peuker; Matthias Meissner; Falko Sojka; Takahiro Ueba; Takashi Yamada; Hiroyuki S. Kato; Toshiak ..., Langmuir, 2014

Naphthalene, C10H8, is a polycyclic aromatic hydrocarbon (PAH) consisting of two fused benzene rings. From previous studies, it is known to form three different commensurate structures in thin epitaxial films on Cu(111), depending on the preparation conditions. One of these structures even ...


Anomalous Diffusion in Thermoresponsive Polymer–Clay Composite Hydrogels Probed by Wide-Field Fluorescence Microscopy

13.11.2014 | Beate Stempfle; Anna Große; Bernhard Ferse; Karl-Friedrich Arndt; Dominik Wöll, Langmuir, 2014

Thermoresponsive materials exhibit an enormous potential for tissue engineering, separation systems, and drug delivery. We investigated the diffusion of laponite clay nanoparticles, which serve as physical cross-linkers to achieve improved material properties in poly(N-isopropylacrylamide) ...


Understanding the Role of H-Bonding in Self-Aggregation in Organic Liquids by Fatty Acid Amphiphiles with a Hydrocarbon Tail Containing Different H-Bonding Linker Groups

12.11.2014 | Amrita Pal; Rita Das Mahapatra; Joykrishna Dey, Langmuir, 2014

In this work, we have designed and synthesized a series of fatty acid amphiphiles that have the same structural skeleton but different hydrogen-bonding (H-bonding) functional groups in the hydrocarbon chain. To examine the importance of the H-bonding interaction on the formation of a ...


Macroporous Polymer Particles via Reactive Gelation under Shear: Effect of Primary Particle Properties and Operating Parameters

12.11.2014 | Alexandros Lamprou; Itır Köse; Zoé Peña Aguirre; Giuseppe Storti; Massimo Morbidelli; Miroslav Soos, Langmuir, 2014

Reactive gelation under shear is a recently developed procedure toward rigid macroporous polymeric particles that does not require the use of any porogen. A comprehensive study of the effect of individual parameters on the resulting material characteristics is presented. Primary particle ...


Hydrogen Exposure Effects on Pt/Al2O3 Catalysts Coated with Thiolate Monolayers

11.11.2014 | April R. Corpuz; Simon H. Pang; Carolyn A. Schoenbaum; J. William Medlin, Langmuir, 2014

Diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) was used to examine the effect of thermal treatment of self-assembled monolayers (SAMs) produced from various thiols (1-hexanethiol, 1-decanethiol, 1-octadecanethiol, 1,6-hexanedithiol, 1,10-decanedithiol, 1,2-benzenedithiol) on ...


Pluronics F-127/L-81 Binary Hydrogels as Drug-Delivery Systems: Influence of Physicochemical Aspects on Release Kinetics and Cytotoxicity

10.11.2014 | Alisson Oshiro; Deyse C. da Silva; Joyce C. de Mello; Vivian W. R. de Moraes; Leide P. Cavalcanti; Margareth K. K. D ..., Langmuir, 2014

We investigated the structure of the binary mixture of Pluronic F-127 (PL F-127) and Pluronic L-81 (PL L-81), as hydrogels for sumatriptan delivery and investigated the mixture possible use via subcutaneous route for future applications as a long-acting antimigraine formulation. We studied the ...


Vesicle Formation by l-Cysteine-Derived Unconventional Single-Tailed Amphiphiles in Water: A Fluorescence, Microscopy, and Calorimetric Investigation

10.11.2014 | Rita Ghosh; Joykrishna Dey, Langmuir, 2014

Two new l-cysteine-derived zwitterionic amphiphiles with poly(ethylene glycol) methyl ether (mPEG) tail of different chain lengths were synthesized and their surface activity and self-assembly properties were investigated. In aqueous phosphate buffered solution of pH 7.0, the amphiphiles were ...


Conversion of Amyloid Fibrils of Cytochrome c to Mature Nanorods through a Honeycomb Morphology

05.11.2014 | Shubhasis Haldar; Pallabi Sil; Muruganandan Thangamuniyandi; Krishnananda Chattopadhyay, Langmuir, 2014

Amyloid species with various morphologies have been found for different proteins and disease systems. In this article, we aim to ask if these morphologies are unique to a particular protein or if they convert from one to another. Using a heme protein containing iron as the transition-metal ...


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