jimena tuninetti - Academia.edu (original) (raw)

Papers by jimena tuninetti

Redox Report, 2002

The quenching ability of photogenerated oxidative species by some antimuscarinic drugs genericall... more The quenching ability of photogenerated oxidative species by some antimuscarinic drugs generically named atropines (e.g. atropine [I] eucatropine [II], homatropine [III] and scopolamine [IV]) have been investigated employing stationary photolysis, polarographic detection of dissolved oxygen, stationary and time-resolved fluorescence spectroscopy, and laser flash photolysis. Using Rose Bengal as a dye sensitiser for singlet molecular oxygen, O 2 (1 g

Molecular Crystals and Liquid Crystals, 2010

The time span of the induction period, present in aniline oxidative polymerization, is reduced by... more The time span of the induction period, present in aniline oxidative polymerization, is reduced by illumination of the solution with UV light. In that way, aniline polymerization rate is increased. Based on such effect a photolithographic process to produce conductive polyaniline patterns is demonstrated.

Asociación de Química Argentina, Feb 1, 2019

Phys. Chem. Chem. Phys., 2015

We describe the creation of interfacial architectures displaying pH-dependent ionic transport pro... more We describe the creation of interfacial architectures displaying pH-dependent ionic transport properties which until now have not been observed in polyelectrolyte multilayers.

Microporous and Mesoporous Materials, 2016

We report here the first use of electrochemical tools to quantify molecular transport from aqueou... more We report here the first use of electrochemical tools to quantify molecular transport from aqueous solutions into ZIF-8 MOF thin films. Our experimental findings reveal that molecular transport through ZIF-8 films in aqueous environments is purely dominated by solvent-filled intergrain mesoporosity and exhibits two well-defined transport regimes.

Journal of the American Chemical Society, Jan 16, 2015

The ability to modulate the surface chemical characteristics of solid-state nanopores is of great... more The ability to modulate the surface chemical characteristics of solid-state nanopores is of great interest as it provides the means to control the macroscopic response of nanofluidic devices. For instance, controlling surface charge and polarity of the pore walls is one of the most important applications of surface modification that is very relevant to attain an accurate control over the transport of ions through the nanofluidic architecture. In this work, we describe a new integrative chemical approach to fabricate nanofluidic diodes based on the self-polymerization of dopamine (PDOPA) on asymmetric track-etched nanopores. Our results demonstrate that PDOPA coating is not only a simple and effective method to modify the inner surface of polymer nanopores fully compatible with the fabrication of nanofluidic devices but also a versatile platform for further integration of more complex molecules through different covalent chemistries and self-assembly processes. We adjusted the chemic...

RSC Adv., 2015

We describe the use of sulfonate-terminated self-assembled monolayers as very efficient surface-c... more We describe the use of sulfonate-terminated self-assembled monolayers as very efficient surface-confined nucleation agents for rapid growth of dense, thick and well-percolated ZIF-8 films.

Molecular Systems Design & Engineering

We hereby report on the thermodynamic and kinetic aspects of ZIF-8 MOF synthesis when performed u... more We hereby report on the thermodynamic and kinetic aspects of ZIF-8 MOF synthesis when performed using methanolic solutions of precursors and 3-mercaptopropionic acid (MPA) acting as a chemical modifying agent.

Metal-organic frameworks (MOFs) belong to a relatively new class of hybrid organic–inorganic mate... more Metal-organic frameworks (MOFs) belong to a relatively new class of hybrid organic–inorganic materials featuring high surface areas, a wide range of pore sizes, pore shapes, and a great variety of chemical functionalities exposed in the pore walls. These interesting features are possible due to an overwhelming number of organic linkers and metal cluster combinations, thus yielding a very broad variety of materials suitable for diverse applications such as; e.g., separations, gas storage, heterogeneous catalysis, or biological related uses when biocompatibility is ensured. Zeolitic imidazolate frameworks (ZIFs) constitute a subclass of MOFs, in which the zeolite-type topology (with its proverbial xed Si–O–Si 145 angle) is achieved by the formation of a geometrically similar M–N–M bond; with N symbolizing a nitrogen atom from an imidazolate or substituted imidazolate linker, and M a metal ion such as Co or Zn tetrahedrally coordinated. In particular, ZIF-8 is an appealing material fo...

Metal-Organic Frameworks (MOFs) are a relatively new class of porous materials constituted by str... more Metal-Organic Frameworks (MOFs) are a relatively new class of porous materials constituted by strong bonds between inorganic clusters (or secondary building units SBUs) and organic struts forming open crystalline networks. Due to the large variety of inorganic and organic building units possible to be connected, there are more than 10000 MOFs crystallographic structures reported so far in the Cambridge Structural Database (CSD). This structural versatility together with the possibility for their preand postsynthetic functionalization, provide with a great number of opportunities in terms of surface chemistry and functionalization for their application in diverse fields such as selective gas adsorption and storage, sensors and actuators, energy storage and conversion, among others. In this article, we briefly survey significant contributions related to synthesis and post-synthetic modification of MOFs and composite materials integrating MOFs. These materials feature interesting prope...

Industrial & Engineering Chemistry Research, 2020

Journal of Inorganic and Organometallic Polymers and Materials

ACS Applied Nano Materials

Colloidal suspensions of Zn-based ZIF-8 metal–organic framework (MOF) particles were synthesized ... more Colloidal suspensions of Zn-based ZIF-8 metal–organic framework (MOF) particles were synthesized (both micrometer μ-ZIF-8- and nanometer n-ZIF-8-sized, respectively). Postsynthetic modification was...

Materials Science and Engineering: C

Global Challenges

Due to its deleterious effects on health, development of new methods for detection and removal of... more Due to its deleterious effects on health, development of new methods for detection and removal of pesticide residues in primary and derived agricultural products is a research topic of great importance. Among them, imazalil (IMZ) is a widely used post-harvest fungicide with good performances in general, and is particularly applied to prevent green mold in citrus fruits. In this work, a composite film for the impedimetric sensing of IMZ built from metal-organic framework nanocrystallites homogeneously distributed on a conductive poly(3,4-ethylene dioxythiophene) (PEDOT) layer is presented. The as-synthetized thin films are produced via spin-coating over poly(ethylene terephtalate (PET) substrate following a straightforward, cost-effective, single-step procedure. By means of impedance spectroscopy, electric transport properties of the films are studied, and high sensitivity towards IMZ concentration in the range of 15 ppb to 1 ppm is demonstrated (featuring 1.6 and 4.2 ppb limit of detection, when using signal modulus and phase, respectively). The sensing platform hereby presented could be used for the construction of portable, miniaturized, and ultrasensitive devices, suitable for pesticide detection in food, wastewater effluents, or the assessment of drinking-water quality.

Materials Today Chemistry

J. Mater. Chem. A

The redox method of synthesis provides highly efficient transition metal–graphene oxide nanocatal... more The redox method of synthesis provides highly efficient transition metal–graphene oxide nanocatalysts.

Langmuir : the ACS journal of surfaces and colloids, Jan 9, 2018

We present experimental results demonstrating the suitability of polyelectrolyte capping as a sim... more We present experimental results demonstrating the suitability of polyelectrolyte capping as a simple and straightforward procedure to modify hydrophilic/hydrophobic character of porous films, thus allowing additional control on transport properties. In particular, we synthesized ZIF-8 metal organic framework (MOF) films, an archetypal hydrophobic zeolitic imidazolate framework, constituted by Zn ions tetrahedrally coordinated with bidentate 2-methylimidazolate organic linker, and poly(4-styrenesulfonic acid) as capping agent (PSS). MOF films were synthesized via sequential one pot (SOP) steps over conductive substrates conveniently modified with primer agents known to enhance heterogeneous nucleation, followed by dip-coating with PSS aqueous solutions. Crystallinity, morphology, and chemical composition of ZIF-8 films were confirmed with traditional methods. Continuous electron density depth profile obtained with synchrotron light X-ray reflectivity (XRR) technique, suggest that PSS...

Physical chemistry chemical physics : PCCP, Jan 4, 2018

Interfacial supramolecular architectures displaying mesoscale organized components are of fundame... more Interfacial supramolecular architectures displaying mesoscale organized components are of fundamental importance for developing materials with novel or optimized properties. Nevertheless, engineering the multilayer assembly of different building blocks onto a surface and exerting control over the internal mesostructure of the resulting film is still a challenging task in materials science. In the present work we demonstrate that the integration of surfactants (as mesogenic agents) into layer-by-layer (LbL) assembled polyelectrolyte multilayers offers a straightforward approach to control the internal film organization at the mesoscale level. The mesostructure of films constituted of hexadecyltrimethylammonium bromide, CTAB, and polyacrylic acid, PAA (of different molecular weights), was characterized as a function of the number of assembled layers. Structural characterization of the multilayered films by grazing-incidence small-angle X-ray scattering (GISAXS), showed the formation o...