New TiO(2) films have been self-assembled on solid substrate by dip-coating using TiCl(4) as the titanium source and the partly fluorinated surfactant F(CF(2))(8)C(2)H(4)(OC(2)H(4))(9)OH as the liquid crystal template. By control over the dip-withdrawal speed, film thicknesses from a minimum of 43 nm were produced with rms roughnesses of 0.5-0.7 nm. The films were characterized by X-ray reflectivity, grazing incidence small-angle X-ray scattering, atomic force microscopy, contact angle measurements, and Raman spectroscopy. Their GI-SAXS patterns are characteristic of a 2-D hexagonal structure in which tubular rods of the fluorinated surfactant are packed hexagonally and aligned parallel to the substrate. Reflectivity and contact angle measurements of the as-prepared film indicate that a low-density hydrophilic TiO(2) surface presents to the air.
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http://dx.doi.org/10.1021/la902224t | DOI Listing |
Int J Biol Macromol
December 2024
Qingdao Sunefire Science & Technology Shares Co., Ltd, Qingdao 266423, China.
Polymers (Basel)
November 2024
Faculty of Dental Medicine, "Apollonia" University of Iasi, 11 Pacurari Street, 700115 Iasi, Romania.
(1) Background: Since the discovery of antibiotics in the first half of the 20th century, humans have abused this privilege, giving rise to antibiotic-resistant pathogens. Recent research has brought to light the use of antimicrobial peptides in polymers, hydrogels, and nanoparticles (NPs) as a newer and safer alternative to traditional antibiotics. (2) Methods: This review article is a synthesis of the scientific works published in the last 15 years, focusing on the synthesis of polymers with proven antimicrobial properties.
View Article and Find Full Text PDFChemosphere
December 2024
Center for Environmental Solutions & Emergency Response, U.S. Environmental Protection Agency, Cincinnati, OH, USA. Electronic address:
Aqueous film-forming foams (AFFF) containing per- and polyfluoroalkyl substances (PFAS) are widely used as fire suppressants. Due to rising health and environmental concerns, fluorine-free foams (F3) are being developed and tested as safer alternatives. However, the impact of these replacement products on ecologically important earthworms has not been adequately studied.
View Article and Find Full Text PDFDalton Trans
November 2024
Department of Chemistry, Faculty of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur-603203, Tamil Nadu, India.
Biomacromolecules
December 2024
Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, 128 40 Prague 2, Czech Republic.
Amphiphilic gradient copolymers are promising alternatives to block copolymers for self-assembled nanomaterials due to their straightforward synthesis via statistical copolymerization of monomers with different reactivities and hydrophilicity. By carefully selecting monomers, nanoparticles can be synthesized in a single step through gradient copolymerization-induced self-assembly (gPISA). We synthesized highly sensitive F MRI nanotracers via aqueous dispersion gPISA of hydrophilic poly(ethylene glycol) methyl ether methacrylate (PEGMA) with core-forming ,-(2,2,2-trifluoroethyl)acrylamide (TFEAM).
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