Listar por autor "a4c1ca13-e381-4890-99f6-3372050a48a2"
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Behind the Optimization of the Sensor Film: Bioconjugation of Triangular Gold Nanoparticles with Hemoproteins for Sensitivity Enhancement of Enzymatic Biosensors
Chávez, Miriam; Fernández-Merino, Ángela; Del Caño-Ochoa, Rafael; Sánchez-Obrero, Guadalupe; Madueño, Rafael; Blázquez, Manuel; Pineda, Teresa; Chávez, Miriam; Fernández-Merino, Ángela (MDPI, 2023)Electrochemical biosensors are widely used in a multitude of applications, such as medical, nutrition, research, among other fields. These sensors have been historically used and have not undergone many changes in terms ... -
Characterization of a self-assembled monolayer of O-(2-Mercaptoethyl)-O′-methyl-hexa(ethylene glycol) (EG7-SAM) on gold electrodes
Chávez, Miriam; Sánchez-Obrero, Guadalupe; Madueño, Rafael; Sevilla, José Manuel; Blázquez, Manuel; Pineda, Teresa (Elsevier, 2021)The modification of surfaces by polyethylene glycol (EGn) is an approach used to reduce the antifouling effects of these materials in a biological medium. It has been found that the packing density and conformational order ... -
Characterization of self-assembled Bis[2-(2-bromoisobutyryloxy) undecyl] disulphide (DTBU) on gold surfaces suitable for use in surface-initiated atom transfer radical polymerization (SI-ATRP)
Chávez, Miriam; Fuentes-Rodríguez, Laura; Sánchez-Obrero, Guadalupe; Madueño, Rafael; Sevilla, José Manuel; Blázquez, Manuel; Pineda, Teresa (Elsevier, 2022)Bis[2-(2-bromoisobutyryloxy) undecyl] disulphide (DTBU) is an initiator for surface-initiated atom transfer radical polymerization (SI-ATRP) able to functionalize metal surfaces through formation of self-assembled monolayers ... -
Distinct thermoresponsive behaviour of oligo- and poly-ethylene glycol protected gold nanoparticles in concentrated salt solutions
Chávez, Miriam; Fernández-Merino, Ángela; Sánchez-Obrero, Guadalupe; Madueño, Rafael; Sevilla, José Manuel; Blázquez, Manuel; Pineda, Teresa (Royal Society of Chemistry, 2021)In this work, the methoxy terminated oligo- and polyethylene glycol of different chain lengths (EGn, n ¼ 7, 18, 45 and 136) is grafted on AuNP surfaces under conditions where they attain maximum grafting densities. These ... -
Effective replacement of cetyltrimethylammonium bromide (CTAB) by mercaptoalkanoic acids on gold nanorod (AuNR) surfaces in aqueous solutions
Del Caño-Ochoa, Rafael; Gisbert-González, José M.; González Rodríguez, José; Sánchez-Obrero, Guadalupe; Madueño, Rafael; Blázquez, Manuel; Pineda, Teresa (Royal Society of Chemistry, 2020)The highly packed cetyltrimethylammonium bromide (CTAB) bilayer built up on the surface of gold nanorods (AuNRs) when synthetized by the seed-mediated procedure hampers the complete ligand exchange under experimental ... -
Effects of the potential and the electrolyte nature in the integrity of the O-(2-Mercaptoethyl)-O′-methyl-hexa(ethylene glycol) self-assembled monolayer by electrochemical impedance spectroscopy
Chávez, Miriam; Sánchez-Obrero, Guadalupe; Madueño, Rafael; Sevilla, José Manuel; Blázquez, Manuel; Pineda, Teresa (Elsevier, 2022)This work addresses an in-deep study of the ionic conductive properties of the O-(2-Mercaptoethyl)-O’-methyl-hexa(ethylene glycol)-self assembled monolayer (EG7-SAM) by electrochemical impedance spectroscopy in a range of ... -
Efficient formation of poly(ethylene glycol) polymer brushes on gold electrodes via surface-initiated electrochemically mediated ATRP (SI-eATRP)
Chávez, Miriam; Luo, Jie; Sánchez-Obrero, Guadalupe; Fantin, Marco; Madueño, Rafael; Isse, Abdirisak A.; Sevilla, José Manuel; Blázquez, Manuel; Pineda, Teresa (Elsevier, 2023)Electrochemically mediated surface-initiated atom transfer radical polymerization (SI-eATRP) is an interesting grafting from technique used to grow, in a controlled way, polymeric films from a wide range of surfaces, ... -
Electrochemical evaluation of the grafting density of self-assembled monolayers of polyethylene glycol of different chain lengths formed by the grafting to approach under conditions close to the cloud point
Chávez, Miriam; Sánchez-Obrero, Guadalupe; Madueño, Rafael; Sevilla, José Manuel; Blázquez, Manuel; Pineda, Teresa (Elsevier, 2022)Grafting densities of polymers on gold surfaces are important parameters that inform about the chain conformation adopted by the chains, either mushroom or brush conformation. Most of the literature reports on this topic ... -
Hemoglobin becomes electroactive upon interaction with surface-protected Au nanoparticles
Del Caño-Ochoa, Rafael; Mateus, Lucía; Sánchez-Obrero, Guadalupe; Sevilla, José Manuel; Madueño, Rafael; Blázquez, Manuel; Pineda, Teresa (Elsevier, 2018)In this work, we report on the electrochemical behavior of bioconjugates prepared with gold nanoparticles (AuNP) capped with three different molecular layers (citrate anions, 6-mercaptopurine and ω-mercaptoundecanoic acid) ... -
Hemoglobin bioconjugates with surface-protected gold nanoparticles in aqueous media: The stability depends on solution pH and protein properties
Del Caño-Ochoa, Rafael; Mateus, Lucía; Sánchez-Obrero, Guadalupe; Sevilla, José Manuel; Madueño, Rafael; Blázquez, Manuel; Pineda, Teresa (Elsevier, 2017)The identification of the factors that dictate the formation and physicochemical properties of protein-nanomaterial bioconjugates are important to understand their behavior in biological systems. The present work deals ... -
Influence of Patterning in the Acid–Base Interfacial Properties of Homogeneously Mixed CH3- and COOH-Terminated Self-Assembled Monolayers
Puente-Santiago, A.R.; Sánchez-Obrero, Guadalupe; Pineda, Teresa; Blázquez, Manuel; Madueño, Rafael (American Chemical Society, 2018)The acid/base interfacial behavior of mixed self-assembled monolayers (SAMs) of 1-decanethiol (DT) and 11-mercaptoundecanoic acid (MUA) formed on gold from a micellar medium has been characterized by electrochemical impedance ... -
Self-assembled monolayers of O-(2-Mercaptoethyl)-O′-methyl-hexa(ethylene glycol) (EG7-SAM) on gold electrodes. Effects of the nature of solution/electrolyte on formation and electron transfer blocking characteristics
Chávez, Miriam; Sánchez-Obrero, Guadalupe; Madueño, Rafael; Sevilla, José Manuel; Blázquez, Manuel; Pineda, Teresa (Elsevier, 2022)The self-assembly of O-(2-Mercaptoethyl)-O’-methyl-hexa(ethylene glycol) (EG7) on gold substrates produces monolayers whose structure should depend primarily on the solvents used for their formation. Although this should ... -
Study of the Self-assembly Process of an oligo(ethylene glycol)-thioacetyl Substituted Theophylline (THEO) on Gold Substrates.
Sánchez-Obrero, Guadalupe; Chávez, Miriam; Madueño, Rafael; Blázquez, Manuel; Pineda, Teresa; López-Romero, Juan Manuel; Sarabia, Francisco; Hierrezuelo, Jesús; Contreras, Rafael (Elsevier, 2018)A new oligo(ethylene glycol)-thioacetyl substituted theophylline (THEO) has been synthesized and used to form self-assembled monolayers (SAMs) on different gold substrates. The THEO-SAMs formed are compact and passivate ...