Search results for: Jose H. Hodak

Items from 1 to 8 out of 8 results

article

Photosubstitution of Monodentate Ligands from Ru^II–Dicarboxybipyridine Complexes

Rolando M. Caraballo, Pablo Rosi, José H. Hodak, Luis M. Baraldo

European Journal of Inorganic Chemistry > 2017 > 30 > 3612 - 3621

We report the photophysical and photochemical properties of Ru^II–polypyridine complexes [Ru(bpy)(dcbpy)py₂]²⁺ (1)²⁺ and [Ru(dcbpy)₂py₂]²⁺ (2)²⁺ (bpy = 2,2′‐bipyridine, dcbpy = 4,4′‐dicarboxy‐2,2′‐bipyridine, py = pyridine). These complexes combine a monodentate ligand with a chelate bipyridine substituted with carboxylate groups. At low pH, both complexes present metal‐to‐ligand charge transfer absorption...

article

Controlling the preferential orientation in sol-gel prepared CaCu3Ti4O12 thin films by LaAlO3 and NdGaO3 substrates

Suriyong Pongpaiboonkul, Yumairah Kasa, Ditsayut Phokharatkul, Bundit Putasaeng, more

Applied Surface Science > 2016 > 385 > C > 324-332

Researchers have paid considerable attention to CaCu₃Ti₄O₁₂ (CCTO) due to the colossal dielectric constant over a wide range of frequency and temperature. Despite of the growing number of works dealing with CCTO, there have been few studies of the role played by the substrate in inducing structural and dielectric effects of this material. In this work, highly-oriented CCTO thin films have been deposited...

article

Enhancement of H2S-sensing performances with Fe-doping in CaCu3Ti4O12 thin films prepared by a sol–gel method

Suriyong Pongpaiboonkul, Ditsayut Phokharatkul, Jose H. Hodak, Anurat Wisitsoraat, more

Sensors and Actuators B: Chemical > 2016 > 224 > C > 118-127

In this work, the effects of Fe-doping on structural and gas-sensing properties of CaCu₃Ti₄O₁₂ (CCTO) thin film prepared by a sol–gel method were systematically studied. Sol–gel-derived CCTO thin films with different Fe-doping concentrations were deposited on alumina substrates by spin-coating and Au/Cr interdigitated electrodes were patterned onto the films by photolithography, sputtering and lift-off...

article

The Role of Counterion Valence and Size in GAAA Tetraloop–Receptor Docking/Undocking Kinetics

Julie L. Fiore, Erik D. Holmstrom, Larry R. Fiegland, Jose H. Hodak, more

Journal of Molecular Biology > 2012 > 423 > 2 > 198-216

For RNA to fold into compact, ordered structures, it must overcome electrostatic repulsion between negatively charged phosphate groups by counterion recruitment. A physical understanding of the counterion-assisted folding process requires addressing how cations kinetically and thermodynamically control the folding equilibrium for each tertiary interaction in a full‐length RNA. In this work, single-molecule...

article

Mechanical strength and hydrophobicity of cotton fabric after SF6 plasma treatment

K. Kamlangkla, B. Paosawatyanyong, V. Pavarajarn, Jose H. Hodak, more

Applied Surface Science > 2010 > 256 > 20 > 5888-5897

Surface treatments to tailor fabric properties are in high demand by the modern garment industry. We studied the effect of radio-frequency inductively coupled SF6 plasma on the surface characteristics of cotton fabric. The duration of the treatment and the SF6 pressure were varied systematically. We measured the hydrophobicity of treated cotton as a function of storage time and washing cycles. We...

article

Monovalent and Divalent Promoted GAAA Tetraloop-Receptor Tertiary Interactions from Freely Diffusing Single-Molecule Studies

Julie L. Fiore, Jose H. Hodak, Oliver Piestert, Christopher D. Downey, more

Biophysical Journal > 2008 > 95 > 8 > 3892-3905

Proper assembly of RNA into catalytically active three-dimensional structures requires multiple tertiary binding interactions, individual characterization of which is crucial to a detailed understanding of global RNA folding. This work focuses on single-molecule fluorescence studies of freely diffusing RNA constructs that isolate the GAAA tetraloop-receptor tertiary interaction. Freely diffusing conformational...

article

pH tunable morphology of the gold nanoparticles produced by citrate reduction

Wissanu Patungwasa, José H. Hodak

Materials Chemistry and Physics > 2008 > 108 > 1 > 45-54

The reduction of AuCl ₄ ⁻ by citrate produces gold nanoparticles with a variety of shapes and sizes depending on the exact conditions used in the preparation. We present results that show that the pH of the reacting mixture has a dramatic effect on the size, polydispersity and morphology of the resulting gold nanoparticles. This occurs by altering the citrate charge controlling its stabilizing...

article

Metal Ion Dependence, Thermodynamics, and Kinetics for Intramolecular Docking of a GAAA Tetraloop and Receptor Connected by a Flexible Linker ^†

Christopher D. Downey, Julie L. Fiore, Colby D. Stoddard, Jose H. Hodak, more

Biochemistry > 2006 > 45 > 11 > 3664 - 3673

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