Anisotropic Proton Conductivity in Ln-M MOFs Mediated by Water Molecules: Experimental and Computational Insights.

Isostructural metal-organic frameworks (MOFs) built from oxidiacetate, oda, [LaCo(oda)(HO)]·14HO (), [PrCo(oda)(HO)]·14HO (), and [LaNi(oda)(HO)]·14HO () were synthesized and characterized to investigate their proton conduction properties. The presence of a hydrogen-bonding network formed by guest water molecules within the MOF channels was evidenced through crystallographic analysis and computational simulations. Powder conductivity measurements revealed a Grotthuss-type proton transport mechanism with consistent activation energies across all three compounds, but grain boundary effects limited overall performance.

Graphene Quantum Dots Drive Spontaneous Metal Reduction to Form Stable and Electroactive Core-Shell Nanocolloids.

This work demonstrates a spontaneous synthesis of ∼8.0, ∼7.0, and ∼3.

Dependence of the crystal structure of Prussian blue on the occupation of interstitial sites.

Transition metal ferrocyanide compounds, widely known as Prussian blue analogues (PBAs), constitute a class of metal-organic frameworks (MOFs) that exhibit a broad spectrum of physical properties and technological applications. Recently, PBAs have garnered significant attention as promising cathode materials for lithium-free rechargeable batteries. In this study, we present a comprehensive investigation, based on density functional theory (DFT), into the crystal structure and alkali-ion site occupancy of two representative systems: Prussian blue (AFe[Fe(CN)]) and Prussian white (AFe[Fe(CN)]), both in their soluble and insoluble forms, under various alkali-metal intercalations (A = Li, Na, K, Rb).

Zinc determination in aqueous samples using energy-dispersive X-ray fluorescence spectrometry after magnetic solid-phase microextraction using FeO nanoparticles.

A novel analytical method for zinc (Zn) determination in aqueous samples was developed and validated using magnetic solid-phase microextraction (MSPME) combined with element detection energy-dispersive X-ray fluorescence (EDXRF). Zn was extracted from aqueous samples using FeO nanoparticles impregnated with 1-(2-pyridylazo)-2-naphthol (PAN). Particle preparation involved two steps: synthesising magnetite(FeO) particles and impregnating them with PAN.

Exploring a series of multifunctional Mn(I) tricarbonyls as prospective agents against trypanosomatid parasites: a comparative study with the Re(I) analogues.

Diseases caused by trypanosomatid parasites are among the most pressing neglected illnesses. Chagas disease, caused by , and visceral Leishmaniasis, caused by , have a severe health impact in developing countries. Searching for prospective metal-based drugs against these diseases, five multifunctional -[Mn(CO)(CTZ)(NN)](PF) compounds, including four new derivatives, were synthesized and thoroughly characterized, featuring NN polypyridyl derivatives and Clotrimazole (CTZ) as bioactive ligands.

Development, Characterization, and Evaluation of Chi-Tn mAb-Functionalized DOTAP-PLGA Hybrid Nanoparticles Loaded with Docetaxel for Lung Cancer Therapy.

: The focus of this study was to prepare and characterize docetaxel (DCX)-loaded lipid/polymer hybrid nanoparticles (LPHNps) functionalized with the monoclonal antibody (mAb) Chi-Tn for a potential active targeting approach in lung cancer treatment. : We synthesized DOTAP-PLGA hybrid nanoparticles loaded with DCX and functionalized them with Chi-Tn mAb through a biotin-avidin approach. The physicochemical characterization involved dynamic light scattering, transmission electron microscopy, Raman spectroscopy, and atomic force microscopy.

Catalytic Oxidation of Acetone over MnO-SiO Catalysts: An Effective Approach to Valorize Rice Husk Waste.

Rice husk, a byproduct of rice production, poses significant environmental challenges due to disposal issues, while the emission of volatile organic compounds into the atmosphere further exacerbates these concerns. This study addresses both problems by exploring the potential of texturally enhanced SiO, derived from Uruguayan rice husk, as a catalytic support for manganese oxides in the combustion of volatile organic compounds. SiO was synthesized from rice husk ash using a sustainable, acid-free pretreatment method, yielding a notably high silica purity of 96.

In vivo pharmacokinetic study and PBPK modeling: Comparison between 3D-printed nanocrystals and solid dispersions.

The solubility of drugs remains one of the most challenging aspects of formulation development. Several technologies exist to enhance the properties of poorly soluble drugs, with nanocrystal (NC) and solid dispersion (SD) technologies being among the most important. This work compared NCs and SDs under identical conditions using albendazole as a model drug and 3D printing technology as the delivery method.

Experimental ingestion of microplastics in three common Antarctic benthic species.

Microplastics (MP) have spread to every corner of the globe, reaching remote areas like Antarctica. Recent studies detected MP in marine environments, including biota. Benthic organisms suffer negative effects upon MP ingestion, leading to impacts on their populations.

Novel Discrete and Imprinted Fluoride-Selective Sensors: Bridging the Gap from DMSO to Aqueous Samples.

Fluoride in drinking water has beneficial or harmful health effects depending on its concentration. This highlights the need for new low-cost and portable sensors capable of in situ monitoring of F ions. Unfortunately, achieving high levels of water compatibility and fluoride specificity remains a challenge.

Novel Thermosensitive and Mucoadhesive Nasal Hydrogel Containing 5-MeO-DMT Optimized Using Box-Behnken Experimental Design.

We present the development and characterization of a nasal drug delivery system comprised of a thermosensitive mucoadhesive hydrogel based on a mixture of the polymers Poloxamer 407, Poloxamer 188 and Hydroxypropyl-methylcellulose, and the psychedelic drug 5-methoxy-N,-N-dimethyltryptamine. The development relied on a 3 × 3 Box-Behnken experimental design, focusing on optimizing gelification temperature, viscosity and mucoadhesion. The primary objective of this work was to tailor the formulation for efficient nasal drug delivery.

α-FeO/, CoO/, and CoFeO/MWCNTs/Ionic Liquid Nanocomposites as High-Performance Electrocatalysts for the Electrocatalytic Hydrogen Evolution Reaction in a Neutral Medium.

Transition metal oxides are a great alternative to less expensive hydrogen evolution reaction (HER) catalysts. However, the lack of conductivity of these materials requires a conductor material to support them and improve the activity toward HER. On the other hand, carbon paste electrodes result in a versatile and cheap electrode with good activity and conductivity in electrocatalytic hydrogen production, especially when the carbonaceous material is agglomerated with ionic liquids.

Exploring Mixed Ionic-Electronic-Conducting PVA/PEDOT:PSS Hydrogels as Channel Materials for Organic Electrochemical Transistors.

Here, we report the preparation and evaluation of PVA/PEDOT:PSS-conducting hydrogels working as channel materials for OECT applications, focusing on the understanding of their charge transport and transfer properties. Our conducting hydrogels are based on crosslinked PVA with PEDOT:PSS interacting via hydrogen bonding and exhibit an excellent swelling ratio of ~180-200% /. Our electrochemical impedance studies indicate that the charge transport and transfer processes at the channel material based on conducting hydrogels are not trivial compared to conducting polymeric films.

Vibrational properties of metastable orthorhombic BiSe.

Chalcogenide materials are being considered as some of the most promising systems for energy harvesting and energy conversion. Among them, the orthorhombic family of compounds XY (with X = Bi, Sb and Y = S, Se) has attracted special attention due to its interesting atomic structure and thermoelectric and optical properties. While BiS and SbSe have already been applied to solar cells, practical application of the new metastable BiSe is still a challenge due to the lack of data and knowledge on its properties.

On the Donor: Acceptor Features for Poly(3-hexylthiophene): TiO Quantum Dots Hybrid Materials Obtained via Water Vapor Flow Assisted Sol-Gel Growth.

Here, we present a novel methodology for the preparation of P3HT:TiO quantum dots hybrid materials via water vapor flow-assisted sol-gel growth focusing on the structural, optical and electrical property characterization complemented with first-principles calculations as a promising donor-acceptor system for polymer and hybrid solar cells. X-ray diffraction and UV-Vis spectroscopy analyses suggest that the increasing concentration of TiO quantum dots leads to the formation of higher amounts of amorphous regions while the crystalline regions exhibited interesting aspect ratio modifications for the P3HT polymer. Raman spectra evidenced the formation of charge carriers in the P3HT with increasing TiO quantum dots content and the P3HT:TiO 50:50 weight ratio resulted in the best composition for optimizing the bulk electronic conductivity, as evidenced by impedance spectroscopy studies.

A Potential Boron Neutron Capture Therapy Agent Selectively Suppresses High-Grade Glioma: and Exploration.

Glioblastoma (GBM), as the most central nervous system (CNS) intractable disease, has spoiled millions of lives due to its high mortality. Even though several efforts have been made, the existing treatments have had limited success. In this sense, we studied a lead compound, the boron-rich selective epidermal growth factor receptor (EGFR)-inhibitor hybrid , as a potential drug for GBM treatment.

Development of Triamcinolone Acetonide Nanocrystals for Ocular Administration.

Triamcinolone acetonide (TA) is a powerful anti-inflammatory drug used in the treatment of inflammatory ocular disorders; however, its poor aqueous solubility and ocular anatomical barriers hinder optimal treatment. The aim of this work was to obtain triamcinolone acetonide nanocrystals (TA-NC) to improve ocular corticosteroid therapy. Self-dispersible TA-NC were prepared by the bead milling technique followed by spray-drying, exhaustively characterized and then evaluated in vivo in an ocular model of endotoxin-induced uveitis (EIU).

Correction: Discovering atomistic pathways for supply of metal atoms from methyl-based precursors to graphene surface.

Correction for 'Discovering atomistic pathways for supply of metal atoms from methyl-based precursors to graphene surface' by Davide G. Sangiovanni , , 2023, , 829-837, https://doi.org/10.

Multifunctional organometallic compounds for the treatment of Chagas disease: Re(I) tricarbonyl compounds with two different bioactive ligands.

Chagas' disease (American Trypanosomiasis) is an ancient and endemic illness in Latin America caused by the protozoan parasite Although there is an urgent need for more efficient and less toxic chemotherapeutics, no new drugs to treat this disease have entered the clinic in the last decades. Searching for metal-based prospective antichagasic drugs, in this work, multifunctional Re(I) tricarbonyl compounds bearing two different bioactive ligands were designed: a polypyridyl NN derivative of 1,10-phenanthroline and a monodentate azole (Clotrimazole CTZ or Ketoconazol KTZ). Five -[Re(CO)(NN)(CTZ)](PF) compounds and a -[Re(CO)(NN)(KTZ)](PF) were synthesized and fully characterized.

Discovering atomistic pathways for supply of metal atoms from methyl-based precursors to graphene surface.

Conceptual 2D group III nitrides and oxides (, 2D InN and 2D InO) in heterostructures with graphene have been realized by metal-organic chemical vapor deposition (MOCVD). MOCVD is expected to bring forth the same impact in the advancement of 2D semiconductor materials as in the fabrication of established semiconductor materials and device heterostructures. MOCVD employs metal-organic precursors such as trimethyl-indium, -gallium, and -aluminum, with (strong) metal-carbon bonds.

Density Functional Evaluation of Catechol Adsorption on Pristine and Reduced TiO(B)(100) Ultrathin Sheets for Dye-Sensitized Solar Cell Applications.

The introduction of defects is one of the most recurrent pathways to generate modifications to materials' electronic structure and surface reactivity. In this work, calculations based on the density functional theory (DFT) were applied to study the electronic properties of pristine and reduced TiO(B)(100) ultrathin sheets to evaluate their potential as a semiconductor material for dye-sensitized solar cells (DSSCs). It was carried out by introducing vacancy defects on these surfaces and then adsorbing a catechol molecule, used as a model of a direct electron injection sensitizer (type-II dye), in different interaction configurations.

Hybrid Organic-Inorganic Materials and Interfaces With Mixed Ionic-Electronic Transport Properties: Advances in Experimental and Theoretical Approaches.

The main goal of this mini-review is to provide an updated state-of-the-art of the hybrid organic-inorganic materials focusing mainly on interface phenomena involving ionic and electronic transport properties. First, we review the most relevant preparation techniques and the structural features of hybrid organic-inorganic materials prepared by solution-phase reaction of inorganic/organic precursor into organic/inorganic hosts and vapor-phase infiltration of the inorganic precursor into organic hosts and molecular layer deposition of organic precursor onto the inorganic surface. Particular emphasis is given to the advances in joint experimental and theoretical studies discussing diverse types of computational simulations for hybrid-organic materials and interfaces.

Charged lithium adsorption on pristine and defective silicene: a theoretical study.

We investigated by first principle calculations the adsorption of Li(= -1, 0 or +1) on a silicene single layer. Pristine and three different defective silicene configurations with and without Li doping were studied: single vacancy (SV), double vacancy (DV) and Stone-Wales (STW). Structural studies and the adsorption energies of various sites were obtained and compared in order to understand the stability of the Li on the surface.

T908 Polymeric Micelles Improved the Uptake of Sgc8-c Aptamer Probe in Tumor-Bearing Mice: A Co-Association Study between the Probe and Preformed Nanostructures.

Aptamers are oligonucleotides that have the characteristic of recognizing a target with high affinity and specificity. Based on our previous studies, the aptamer probe Sgc8-c-Alexa647 is a promising tool for molecular imaging of PTK7, which is an interesting biomarker in cancer. In order to improve the delivery of this probe as well as create a novel drug delivery nanosystem targeted to the PTK7 receptor, we evaluate the co-association between the probe and preformed nanostructures.