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Size-dependent viscoelasticity in hybrid colloidal gels based on spherical soft nanoparticles and two-dimensional nanosilicates of varying size.
J Colloid Interface Sci
February 2024
Department of Chemical Engineering, University of South Carolina, Columbia, SC 29208, United States; Department of Biomedical Engineering, University of South Carolina, Columbia, SC 29208, United States. Electronic address:
Hypothesis: Hetero-aggregation of oppositely charged colloidal particles with controlled architectural and interactional asymmetry allows modifying gel nanostructure and properties. We hypothesize the relative size ratio between cationic nanospheres and varied-size anionic two-dimensional nanoclays will influence the gel formation mechanisms and resulting rheological performance.
Experiments: Hybrid colloidal gels formed via hetero-aggregation of cationic gelatin nanospheres (∼400 nm diameter) and five types of nanoclays with similar 1 nm thickness but different lateral sizes ranging from ∼ 30 nm to ∼ 3000 nm.
Couple batch-injection analysis and microfluidic paper-based analytical device: A simple and disposable alternative to conventional BIA apparatus.
Talanta
April 2022
Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, São Paulo, SP, 05508-000, Brazil; Instituto Nacional de Ciência e Tecnologia de Bioanalítica, Campinas, SP, 13084-971, Brazil. Electronic address:
Under controlled dispersion conditions, sample injection towards a detector opened essential fields for the Analytical Chemistry fast development methods. Flow injection analysis (FIA) and batch injection analysis (BIA) systems are crucial for injecting the sample in these analytical methods. The BIA system eliminated the flow manifold, with samples injected directly onto the detector inside the batch injection cell.
View Article and Find Full Text PDFA rapid, automated gradient flow injection-spectrophotometric technique for study of metal complexation reactions.
Talanta
October 2014
Faculty of Chemistry, K.N. Toosi University of Technology, Tehran, Iran. Electronic address:
Controlled dispersion as generated in flow injection analysis (FIA) essentially permits an infinite variety of known compositional gradients. Using this unique advantage of FIA, the stability constants of metal complexation are calculated by injecting an aliquot of metal solution into the flow of ligand solution in a single-line manifold. While the ligand dilution is negligible, the concentration gradient of injected metal ion can be calculated from the dispersion pattern which is calibrated previously using a dye solution.
View Article and Find Full Text PDFPhase separation as a tool to control dispersion of multiwall carbon nanotubes in polymeric blends.
ACS Appl Mater Interfaces
March 2010
Department of Chemical Engineering and Leuven Materials Research Center, Katholieke Universiteit Leuven, Willem de Croylaan 46, B-3001, Leuven, Belgium.
Conducting polymeric materials with stable phase microstructures have a range of potential applications. In this work, it is investigated whether phase separation in polymer blends can be used as a tool to create well dispersed conducting filler rich domains in 3D with controlled morphology, potentially resulting in more effective percolation. The effect of amine functionalized multiwall carbon nanotubes (NH(2)-MWCNTs) on the thermally induced phase separation processes in poly[(alpha-methyl styrene)-co-acrylonitrile]/poly(methyl methacrylate) (PalphaMSAN/PMMA) blends was monitored by melt rheology, conductivity spectroscopy, and microscopic techniques.
View Article and Find Full Text PDFSingle reaction interface in flow analysis.
Talanta
December 2005
REQUIMTE, Faculdade de Farmácia da Universidade do Porto, Rua Aníbal Cunha, 164, 4099-030 Porto, Portugal.
The dual or multiple reaction interface concept, commonly associated to the distinct flow techniques, was replaced by a single interface concept, which do not no rely on the utilisation of a well-defined and compelling sample volume but only on mutual penetration of sample and reagent zones at a single reaction interface where both sample and reagent met together prior to detection. In the proposed approach basic principles of flow analysis, such as controlled dispersion and reaction zone formation, are not influenced by sample and reagent volumes but determined exclusively by the extension of the overlap of two adjoining quasi-infinite zones enhanced by multiple flow reversals and the pulsed nature of the flowing streams. The detector is positioned at the core of the flow manifold (not in the conventional terminal position), and repetitive flow reversals enable interface manipulations, including multi-detection of the entire reaction interface or the monitoring of the evolution of a pre-selected interface zone by using suitable reversal cycle times.
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