M. Borlaf

M. Borlaf
Universidad Autónoma de Madrid | UAM

Chemist

About

43
Publications
7,712
Reads
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919
Citations
Citations since 2017
29 Research Items
861 Citations
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
Additional affiliations
November 2020 - August 2022
Universidad de Burgos
Position
  • Researcher
November 2015 - October 2019
Empa - Swiss Federal Laboratories for Materials Science and Technology
Position
  • Researcher
February 2014 - February 2015
Federal University of Santa Catarina
Position
  • PostDoc Position
Education
September 2005 - August 2009
Universidad Autónoma de Madrid
Field of study
  • Inorganic Chemistry

Publications

Publications (43)
Article
Full-text available
The colloidal sol-gel is a well-established method for the synthesis of nanoparticles with high reproducibility, homogeneity and low cost. It is a versatile route which allows synthesising many ceramic materials at the nanometric scale. The process starts with the hydrolysis of the metal precursor and ends with the formation of a colloidal suspensi...
Article
Full-text available
Lithography based Ceramics Manufacturing (LCM), i.e., Digital Light Processing (DLP) is one of the Additive Manufacturing (AM) techniques that is being widely used for the production of ceramic parts. Additionally, the development of photocurable slurries and the influence of the printing parameters on the fabricated parts properties are also recei...
Article
The members of the perovskite oxide family have been vastly explored for their potential as active electrocatalysts for an efficient anodic reaction (i.e. the oxygen evolution reaction, OER) of the water splitting process. Therefore, restless effort has been invested in the development of perovskite oxides as efficient OER catalysts, while the OER...
Article
The main aim of this work was to estimate the dielectric constant of electrospun BaTiO 3 nanofibers (BT NF s) using theoretical models. The effect of calcination temperatures on morphology and crystal structure of BT NF s was also investigated by using SEM, TEM, XRD and Raman spectroscopy. The dielectric constant of BT NF s was calculated by applyi...
Article
Full-text available
The perovskite-type oxide Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) is known as a highly active and stable oxygen evolution reaction (OER) electrocatalyst composited out of non-noble metals. The possibility of using the scalable flame spray synthesis (FSS) technique for the production of BSCF nanoparticles intensified the interest in this material for a futu...
Article
Both multi-walled carbon nanotubes (MWCNTs) and metal or metal oxides have demonstrated virus removal efficacy in drinking water applications. In this study, MWCNTs were coated with copper(I) oxide (Cu2O) using three distinct synthesis procedures (copper ion attachment, copper hydroxide precipitation, and [Cu(NH3)4]²⁺ complex attachment) and virus...
Article
Full-text available
Lithography-based ceramics manufacturing (LCM) processes enable the sophisticated 3 dimensional (3D) shaping of ceramics by additive manufacturing (AM). The build-up occurs, like many other AM processes, layer by layer, and is initiated by light. The built-in digital mirror device (DMD) enables the specific exposure of desired pixels for every laye...
Article
In this study, the synthesis of copper-based multi-walled carbon nanotube composites is described. Over the last years, carbon nanotubes (CNTs) have been widely used in many scientific research fields and have found applications in several sectors, e.g. for water treatment. This work focuses on combining the exceptional characteristics of CNTs, suc...
Article
The development of photosensitive slurries for additive manufacturing is attracting high interest due to their correlation with the final properties of the fabricated parts. Lithography-based ceramics manufacturing (LCM), i.e. digital light processing (DLP), is one of the techniques that is receiving high attention. Within the different ceramic mat...
Article
Alumina toughened zirconia (ATZ) parts were produced via a laser-based powder bed fusion technology using a conventional Nd-YAG continuous wave laser. The powder was produced using a spray drying process and the laser matter interaction was enhanced by a binder pyrolysis. A processing window led to part densities of over 90%. Thermal post-processin...
Article
BaTiO3 (BT) nanotubes (NTs) were synthesized using a co-axial electrospinning process. BT precursor/PVP-ethanol and heavy mineral oil were used as the shell solution and core liquid, respectively. The rheological studies indicated that NTs could be formed by a stable jet at a range of viscosities of the shell solution. Due to the shear thinning beh...
Article
Full-text available
In this work, a fast method for synthesizing TiNb2O7 nanoparticles was developed by combining colloidal sol‐gel and microwave‐assisted hydrothermal synthesis. The synthesis conditions and the subsequent thermal treatments were evaluated analysing their effect on morphological, structural and photocatalytic properties of the synthesized nanoparticle...
Article
Purifying and functionalising multi-walled carbon nanotubes (MWCNTs) are important processes for providing property modifications, improving handling and enhancing reactivity. The removal of impurities allows avoiding synthesis process interferences and the formation of by-products. During the process it is possible to change the MWCNT properties,...
Article
Digital Light Processing (DLP)is a powerful technique for the preparation of ceramic parts with high resolution and complex shapes. In the last years, the development of photosensitive slurries for the production of ceramics with good mechanical properties has received much attention. In this work, ZrO2 UV-curable slurries were prepared in two step...
Article
Full-text available
Perovskite oxides have been gaining attention for its capability to be designed as an ideal electrocatalyst for oxygen evolution reaction (OER). Among promising candidates, the layered double perovskite—PrBaCo2O6-δ (PBC)—has been identified as the most active perovskite electrocatalyst for OER in alkaline media. For a single transition metal oxide...
Article
Perovskite oxides have been at the forefront among catalysts for the oxygen evolution reaction (OER) in alkaline media offering a higher degree of freedom in cation arrangement. Several of highly OER active Co-based perovskites have been known to show extraordinary activities and stabilities when the B-site is partially occupied by Fe. At the curre...
Article
Mixed Ni–Fe metal oxides currently represent some of the most attractive anode catalysts for the electrochemical splitting of water in alkaline electrolyte due to their low overpotentials for the oxygen evolution reaction (OER). Here we employ a practical and scalable liquid-feed flame-spray synthesis capable of producing highly crystalline Ni–Fe o...
Article
The perovskite oxides with general structure formula of ABO 3 have been at the forefront among catalysts for the oxygen evolution reaction (OER) in alkaline media offering a higher degree of freedom in cation arrangement. From its ability to partially accommodate foreign cations (i.e. A’ and B’) of different oxidation states, which then alters the...
Article
Mixed Ni-Fe metal oxides currently represent some of the most attractive anode catalysts for the electrochemical splitting of water due to their low overpotentials for the oxygen evolution reaction (OER) in alkaline electrolytes. The concentrated potassium hydroxide solutions and anion exchange membranes that are typically employed in alkaline wate...
Article
YAG:Ce and YAG:Eu phosphors have been prepared by solid state reaction. The use of submicrometric powders allows preparing pellets with high density, enhancing the photoluminescence (PL) properties. Pellets were prepared by uniaxial pressing and the influence of the thermal treatment on the microstructural and optical properties were also studied....
Article
Nowadays, TiO2 and Nb2O5 are two of the most popular oxides in the field of photocatalysis due to their high activity. Their synthesis and their study not only separately, but also mixing them and their possibility to form other compounds like TiNb2O7 are attracting the attention of different research groups. In this work, a detailed study of a col...
Article
YAG:Ce and YAG:Eu sols were synthesized by a polymeric sol-gel route. The crystallization temperature of YAG was determined by X-ray diffraction as a function of the calcination temperature, revealing that YAG starts to crystallize directly from the amorphous phase at 800 °C. The effects of the thermal treatment and the dopant amount on the photolu...
Article
Full-text available
A simple, rapid, and effective synthesis methodology for the preparation of high-performance TiO2 nanoparticles and thin films by combining colloidal sol-gel and microwave-assisted hydrothermal synthesis was developed. The obtained results indicate that the heating with microwaves at 180 °C for 20 min was enough to synthesize crystalline TiO2 nanop...
Article
Er³⁺ doping of TiO2 colloidal nanocrystals enhances their performance for photo-induced applications. Such doping is known to delay the anatase to rutile transformation under thermal treatment; nonetheless relevant information on the Er³⁺ light emission and location within the TiO2 structures is still incomplete. Er³⁺ photoluminescence emission bot...
Article
Full-text available
CaTiO3 and CaTiO3/TiO2 nanocompounds have been synthesized through a colloidal sol-gel route using Ca²⁺/TiO2 nanoparticulate sols. The peptization time was determined so that as higher is the Ca²⁺ concentration, shorter is the peptization time. The obtained cryogels from the respective sols were calcined at different temperatures (300-900°C) and th...
Article
Full-text available
Photoactive europium doped titanium dioxide (Eu:TiO2) thin films were grown by a matrix assisted pulsed laser evaporation technique. TiO2 and Eu cation-adsorbed TiO2 nanoparticles (NPs) sols were used as starting materials. The sols were synthesized by a colloidal sol–gel route. In order to obtain solid targets, the sols were cooled down until soli...
Article
YAG:Ce materials have been extensively studied as phosphors for blue to white light conversion. In the last years, the preparation methods of YAG:Ce powders in the nanometric scale have received intensive attention due to their special optical properties. In this context, the preparation of luminescent particles with high quantum yield (QY) and par...
Article
A new rapid and energy saving method for the obtention of high performance nanoparticles and thin films of Nb2O5 by microwave-assisted hydrothermal synthesis is reported. The hydrothermal treatment of a sol–gel precursor solution in a microwave oven at 180 °C for 20 min was enough to obtain amorphous nanoparticles with average sizes of 40 nm. The c...
Article
A detailed study of a novel synthesis via colloidal sol–gel route for obtaining nanoparticulate Nb2O5 was performed. Parameters such as temperature and H+:Nb5+ and Nb5+:H2O molar ratios were controlled in order to determine the best conditions of synthesis. Moreover, particle size distribution, zeta potential, structure by X-ray diffraction, and th...
Article
The light emission properties of anatase TiO2/Eu3+ thin films prepared by electrophoretic deposition and of the corresponding precursors nanoparticulate sols and of the xerogels with different Eu3+ contents are reported. Transparent anatase TiO2 thin films were successfully obtained by Electrophoretic Deposition after dilution of the original sols...
Article
Eu3+/TiO2 xerogels have been obtained from colloidal sols by drying at room conditions. Anatase with traces of brookite phases are obtained from the synthesis and the stability of both with temperature is higher (from 400°C up to 800°C) when Eu3+ is present. Raman phonons have been used to detect the different phases and follow the structural trans...
Article
press as: Borlaf M, et al. Rare earth-doped TiO 2 nanocrystalline thin films: Preparation and thermal stability. J Eur Ceram Soc (2014), Abstract A colloidal sol–gel route was used for the synthesis of nanoparticulate TiO 2 and Ln 3+ -doped TiO 2 sols (Ln = Eu or Er; contents of 1, 2, or 3 mol.%), from which the corresponding functional nanocrystal...
Conference Paper
Full-text available
Rare-earth doped TiO2 nanoparticles via colloidal so-gel route have been the focus of intense research due to their potential optical application in filters, solar cells and light emitters. These applications require the preparation of good quality thin films from the colloids. Therefore different procedures have been used ranging from simple dippi...
Article
The synthesis of nanoparticulate TiO2 sols without and with Eu3+ doping (1, 2, or 3 mol%) by the colloidal sol–gel method in aqueous media was investigated, with emphasis on the effect of the Eu3+ doping on the peptization time and rheological properties of the sols. It was found that the addition of Eu3+ increasingly retards the peptization proces...
Article
The effect of Er3+ doping on the thermal stability of TiO2 nanoparticulate xerogels prepared by a colloidal sol–gel route was investigated. It was found that the as-synthesized xerogels crystallize as anatase phase with crystallite sizes in the low nanoscale range (<7 nm) and high-specific surface areas (>100 ± 5 m2/g). Nevertheless, it was also fo...
Chapter
The production of smooth, densely-packed, and continuous casts of colloidal nano-ceramics into architectures for applications ranging from anti-corrosion coatings to transparent optical components and devices is a rapidly developing field. Post-processing procedures, such as, sintering that can form single crystalline or polycrystalline masses from...
Article
Nanoparticulate TiO2/Rh3+ sols have been synthesized by the colloidal sol–gel route. The combination of the data measured with optical techniques such as laser diffraction, dynamic light scattering and multiple light scattering with a near-infrared light allows us to follow up the evolution of the peptization process and to establish the effect of...
Article
Using a simple method involving chemical synthesis and calcination, Er‐doped anatase hollow spheres (HS) have been obtained. Longer dwell times upon the calcination increase the roughness and thickness of the shells, and also facilitate formation of necks between neighboring HS. Anatase‐rutile transformation was observed by FT‐Raman for the TiO2‐HS...
Article
Colloidal sol-gel is a common method used for the preparation of stable and homogeneous sols and thin films. The nanoparticulate sols can be easily deposited by EPD, which is a versatile technique for producing denser and thicker coatings than those produced by other techniques like dipping. A complete characterization of the sols, such as colloida...
Article
Colloidal sol-gel is a common method used for the preparation of stable and homogeneous nanoparticulate sols. In this work, TiO2 and Er3+ doped-TiO2 sols (1, 2 and 3 mole % Er3+) have been prepared. The peptization time, viscosity and isoelectric point increase at higher Er3+ concentration indicating that erbium (III) delays the peptization process...

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Projects (3)
Project
Direct additive manufacturing of ceramics components based on powder bed laser technology.