Rodrigo Moreno

Rodrigo Moreno
Spanish National Research Council | CSIC · Institute of Ceramics and Glass

PhD in Chemistry

About

405
Publications
71,324
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8,428
Citations
Additional affiliations
March 2004 - present
Spanish National Research Council
Position
  • Professor

Publications

Publications (405)
Article
Full-text available
Alumina is one of the most studied and used ceramic materials, but increasing its fracture toughness is still a challenge for many specific impact applications. Adding a second phase with a low coefficient of thermal expansion (CTE) to an alumina matrix can enhance the matrix’s mechanical properties, reduce its sintering temperature, and increase i...
Article
Full-text available
Ti-doped lithium zirconate (LZTO) sheets were successfully made by aqueous tape casting, by starting from an innovative colloidal synthesis route and optimizing the colloidal processing parameters. Zeta potential and particles size measurements, together with rheological characterization, were performed to adjust the slip composition. Then, the sus...
Article
This study investigates the influence of cellulose nanofibers (CNF) on the rheological and mechanical properties of Portland cement pastes with pozzolanic additions, focusing on compressive ductility. Unlike prior research that examines individual factors, this comprehensive analysis evaluates various parameters affecting CNF-enhanced pastes. Using...
Article
Full-text available
Natural hydraulic lime (NHL)-based binders play a crucial role in preserving cultural heritage structures, ensuring integrity and longevity. Beyond traditional uses, these binders exhibit potential for integration into both non-structural and structural components, being compatible with innovative manufacturing processes such as digital fabrication...
Chapter
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Throughout the ceramic processing cycle, it is well known that a small change in the surface energy of as-received powders can cause a considerable effect on the final properties of consolidated materials. The main objective of this chapter is to describe the design and manufacture of new ceramic materials based on strontium-doped lanthanum mangani...
Article
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Semi-solid electrodes and 3D printing is combined to fabricate batteries. • The proof-of-concept for a new type of shape-conformable batteries is demonstrated. • A UBU-shaped battery is fabricated based on MnO 2 and Zn metal. • Acceptable cycle stability (0.45% h − 1) are achieved. • MnO 2-based semi-solid electrodes deliver >150 mAh g − 1 MnO2. A...
Article
Mullite is a widely used refractory ceramic due to its good properties and high temperature stability. The necessity to obtain complex mullite architectures has encouraged the development of new AM techniques with improved resolution and surface finishing quality. In the present work, mullite-based scaffolds were obtained by stereolithography using...
Article
Full-text available
Zirconium silicate (zircon, ZrSiO4) is a ceramic material with excellent thermal properties, such as low thermal conductivity and high thermal shock resistance. In this work, dense zircon complex shaped parts were obtained by aqueous gelcasting through agar gelation. The colloidal stability study was performed through zeta potential measurements as...
Article
Full-text available
Carbon nanomaterials have received increased attention in the last few years due to their potential applications in several areas. In medicine, for example, these nanomaterials could be used as contrast agents, drug transporters, and tissue regenerators or in gene therapy. This makes it necessary to know the behavior of carbon nanomaterials in biol...
Article
The objective of this work is to study the changes in the physical and mechanical properties of strontium-doped lanthanum manganite (LSM) material and LSM-YSZ (ZrO2 doped with 8 mol% yttria) composite, obtained by colloidal processing and sintered by 2.45 GHz microwave sintering at 1200 and 1300°C using two different single-mode cavities. One circu...
Article
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This article develops a probabilistic approach to a micromechanical model to calculate the dynamic viscosity in self-compacting steel-fiber reinforced concrete (SCSFRC), which implies a paradigm shift in the approach of the deterministic models used. It builds on a previous work by the authors in which Bayesian analysis is applied to rheological mi...
Article
Zircon is a ceramic material that decomposes at high temperature, limiting its use by conventional thermal spraying. In this work, it is intended to use thermal spraying from concentrated aqueous suspensions to evaluate the possibility of obtaining coatings in which a significant proportion of zircon could be preserved. For this purpose, stable con...
Article
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In this paper, the interface between yttria stabilized zirconia (Y0.08Zr0.92O2, YSZ) electrolyte and Sr-doped lanthanum manganite (La0.80Sr0.20MnO3, LSM) cathode for solid oxide fuel cells (SOFCs) is studied. For such a purpose, the combination of a suitable synthesis route for obtaining fine powders and simple aqueous colloidal shaping routes is p...
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
The growing demand for high-performance concrete in the construction industry requires understanding how its flow behavior is. For this reason, rheology has become an essential tool when designing this typology of materials , as it allows ensuring their stability after the manufacturing and pouring processes, as well as guaranteeing the requirement...
Article
Three non-conventional extraction techniques (enzyme-assisted with cellulase, citric acid ultrasound-assisted and enzyme-ultrasound-assisted treatment) and conventional citric acid extraction were applied to obtain pectin from raspberry, blueberry, strawberry and redcurrant, and were compared in terms of extraction yields and physicochemical proper...
Article
In this work we have efficiently extracted and characterized pectin from different tissues of astringent (AS) and non-astringent (NAS) persimmon fruits (peel, pulp, whole fruit) for the first time. The highest pectin extraction (≥7.2%) was carried out at 80 °C, 120 min with 1.5% sodium citrate in peel of both AS and NAS persimmon samples. All persi...
Article
The aim of this work was to evaluate the role of MoSi2 content (5, 10, 15 wt%) in the mechanical and tribological behavior of TZ4YS-MoSi2 composites obtained by colloidal processing and spark plasma sintering (SPS) at 1500 °C. Firstly, the densification of TZ4YS-MoSi2 composite and the shrinkage-rate curves by SPS applying 80 MPa from 1300 °C to 15...
Article
The sinterability of 3Y-TZP/TiO2 materials using micrometre-sized ZrO2 and nanometre-sized TiO2 (16 wt%) by one-step fast microwave sintering at low temperature (1200–1300 °C) was investigated. Firstly, in situ detailed analysis of the dielectric properties of the material with temperature was carried out in order to measure the capacity of the mat...
Article
Superhard B4C parts with microarchitectures constituted by ceramic layers and evenly-spaced rGO-enriched reinforcing interlayers were fabricated for the first time. To this end, a concentrated slurry of B4C with its Ti-Al sintering additive was first prepared by aqueous colloidal processing, optimizing its total solids loading and content of both b...
Article
Full-text available
We present a new focus for the Krieger–Dougherty equation from a probabilistic point of view. This equation allows the calculation of dynamic viscosity in suspensions of various types, like cement paste and self-compacting mortar/concrete. The physical meaning of the parameters that intervene in the equation (maximum packing fraction of particles a...
Article
With the motivation of developing B4C composites with superior wear resistance for tribological applications, an ultrafine-grained (∼200−300 nm) B4C composite was fabricated, characterized microstructurally, and tested mechanically and tribologically. First, a well-dispersed powder mixture of B4C nanopowders (∼40 nm) with coarse Ti-Al powders (∼38...
Article
Full-text available
This paper is aims to give an answer to the following question: is the oxidation of graphene a critical issue for high-temperature plasticity in graphene-reinforced ceramics? To give a convincing reply, we will focus on two very different graphene-based ceramic composites: reduced graphene oxide (rGO)-reinforced alumina (α-Al2O3) and reduced graphe...
Article
Full-text available
This paper describes the operation principles of a micro-scale rheometry equipment based on the technology of microchannels on a chip and compares it with a conventional macro-scale rotational rheometer. Both techniques are used for the study of different solutions and suspensions of ceramic particles with different saccharides, which are subjected...
Article
Determining correctly the rheological parameters of the cement paste is a matter of capital importance when designing a self-compacting concrete (SCC). For this, it is necessary to resort to rheometers, which are expensive and, therefore, not available in all laboratories. However, the measurement of plastic viscosity can also be carried out using...
Article
45S5 bioactive glass coatings were deposited by plasma spraying from liquid feedstocks. In these feedstocks, the SiO2 needed to achieve the 45S5 bioactive glass composition has been provided either as tetraethyl orthosilicate (typical precursor of glasses by sol–gel), or as colloidal silica suspension or mixtures of both sources. The synthesised ma...
Article
A ceramic composite was produced by mixing cubic zirconia with graphene nano-platelets. The samples were consolidated by flash sintering in argon atmosphere to avoid the oxidation of the graphene at high temperature. The applied electrical field ranged between 50 V cm⁻¹ to 500 V cm⁻¹, while the current density limit was set between 35 mA mm⁻² and 1...
Article
This study aims to demonstrate the feasibility to develop columnar microstructures in YSZ coatings manufactured by suspension plasma spray, through the modification of the properties of the suspension feedstocks with different common monosaccharides: fructose, ribose and glucosamine. The research also pretends to relate the properties of the suspen...
Article
Superhard composites of B4C reinforced with randomly-oriented reduced graphene oxide (rGO) nanoplatelets are manufactured by a near-net-shape fabrication route based on three successive steps. Firstly, aqueous colloidal processing is used for the environmentally-friendly preparation of a semi-concentrated multi-component slurry (B4C as main compone...
Article
A fabrication route based on aqueous colloidal processing plus transient liquid-phase assisted spark-plasma-sintering (SPS) with Ti-Al additives is described for the environmentally friendly obtention of superhard B4C composites reinforced with reduced graphene oxide (rGO) having orthotropic and isotropic microstructures. It is shown that the forme...
Article
Full-text available
Bulk composites of silicon carbide reinforced zirconia were obtained through colloidal processing and spark plasma sintering, and their microstructural and mechanical properties were investigated. Mixtures of powders of 4 mol% yttria-doped zirconia and silicon carbide, with percentages of 15 and 20 wt% of silicon carbide, were prepared by colloidal...
Article
Full-text available
We report on the colloidal and rheological characterization of suspensions of commercial single-walled carbon nanotubes (SWCNT) and oxidized single walled carbon nanotubes (SWCNT-oxi24h), in water and fetal bovine serum (FBS). The effects of two surfactants, dodecyl-benzene sodium sulfonate (SBDS) and sodium dodecyl sulfate (SDS) at different conce...
Article
The aqueous colloidal processing of submicrometre B4C powder (∼0.6 μm) with coarse Ti-Al powder (∼40 μm) as sintering additive was investigated. Firstly, by measuring the zeta potential, pHs were identified that promote the individual colloidal stability of the B4C and Ti-Al particles as well as their co-dispersion in water with two different deflo...
Article
In this work, the key role of colloid chemistry in the development of novel processing routes for ceramic manufacture is reported. An overview of the origins of a ceramic processing science is presented, emphasizing the pioneering works and the scientific fundaments of all processing steps that make use of suspensions. A brief review of the importa...
Conference Paper
At present, ZrTiO4 nanopowders are used as a dielectric in the electroceramic field, applications of catalysis, microwave telecommunications devices, pigments, composites, etc. One of the most interesting applications is the potential as structural material and similar applications that require a high thermal resistance. However, all the properties...
Article
The present research focuses on the effect of feedstock suspension solid concentration on the microstructure of suspension plasma sprayed Y-TZP/Al2O3/SiC composite coatings. For this purpose, concentrated aqueous suspensions were prepared at 10, 20 and 30 vol% and characterised in terms of zeta potential, rheological behaviour and sedimentation tre...
Article
Morphological, technological and nutritional analyses were done in two scarcely studied starches from Andean tubers (mashua and melloco). The low sedimentation values, and the high zeta potential of mashua and melloco starches in cold dispersions, as consequence of their electronegativity, indicated a better behaviour as stabilizer than potato star...
Article
The effect of annealing duration on structural and optical properties of dip-coated crystalline CZTS thin films was studied. The obtained samples were investigated by several techniques such as XRD, Raman spectroscopy, SEM, UV–vis spectroscopy and Photoluminescence. Being confirmed by Raman spectroscopy, XRD analysis reveals the formation of kester...
Article
A simple procedure for the manufacture of metal oxide based supercapacitors consisting on the electrophoretic deposition (EPD) onto graphite paper of well-dispersed aqueous slurries of manganese oxide with graphene nanoplatelets is presented. EPD was performed using optimised slurries and depositing onto graphite paper electrodes. In order to impro...
Article
This work addressed to investigate the use of fructose as an additive in the water-based suspension feedstock of a Y-TZP/Al2O3/SiC multicomponent coating manufactured by suspension plasma spraying. The effect of fructose on suspension rheology and surface tension and on the microstructure and thermal conductivity of the resulting coatings was asses...
Article
Patterned cathode/electrolyte interfaces formed by a hexagonal array of ∼22 μm deep wells with 24 μm lattice parameter have been prepared by pulsed laser machining to enlarge the contact surface and, consequently, to reduce the cathode polarization of Solid Oxide Fuel Cells. These new interfaces have been tested in YSZ-LSM/YSZ/YSZ-LSM symmetrical c...
Article
K 0.5 Na 0.5 NbO 3 -based materials are serious candidates to replace lead-based piezoceramics since they show excellent electrical and piezoelectric properties. The tape casting technique can be used to obtain highly textured KNN-based ceramics; however, despite industrial and environmental advantages of water-based processing, there are not repor...
Article
Dental pieces are subjected to constant friction due to grinding during mastication and mouth disorders such as bruxism. Therefore, wear resistance of Y-TZP materials used for dental prostheses must be investigated. In this work, the influence of humidity and low temperature hydrothermal degradation (LTD) in 3Y-TZP ceramics subjected to fretting ha...
Article
Full-text available
In this work, the efficient extraction of pectin from sugar beet by-products (pressed, ensiled and dried pulp), by using an acid method or a commercial cellulose, is accomplished. The extraction method had an impact on the pectin monomeric composition, mainly in xylose, arabinose, and galacturonic acid content, as determined by GC-FID. FTIR and SEC...
Article
Magnetoelectric composites are an enabling material technology for a range of novel devices like electrically-tunable magnetic microwave components or room-temperature-operation high-sensitivity magnetic sensors. Among the different approaches under development, cofired ceramic layered composites provide large effective magnetoelectric coefficients...
Article
The preparation of coatings of manganese oxide and graphene nanoplatelets onto graphite paper by aqueous electrophoretic deposition is studied. This method is a fast and environmental friendly procedure for the manufacture of electrodes with enhanced specific capacitance for supercapacitors. The electrodes are prepared either sequentially, depositi...
Article
Nanostructured composites of the LZS (19.58Li2O.11.10ZrO2.69.32SiO2) and LZS (19.58Li2O.11.10ZrO2.69.32SiO2) + (1, 2.5, 5 vol.%) Al2O3 systems were obtained through a colloidal approach using nanoparticulate oxides as precursors. Stable suspensions containing 40 vol.% of solids were obtained, after deagglomeration for 24 h in a ball mill with 4% am...
Article
Full-text available
Prebiotic carbohydrates derived from lactulose (OsLu) are appealing ingredients that provide beneficial effects following their fermentation by the gut microbiota; however, more investigation is needed to evaluate their technological properties and applicability as a functional food ingredient in the market. In this paper, a comparative study on th...
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
A route based on aqueous colloidal processing followed by liquid-phase assisted spark-plasma-sintering (SPS) is described for fabricating eco-friendly nanocomposites of SiC with nano-carbonaceous phases (nanotubes, nanoplatelets, or nanoparticles). To this end, the conditions optimizing the aqueous colloidal co-dispersion of SiC nanoparticles, Y3Al...
Article
The use of allotropic phases of carbon (i.e. nanotubes, graphene or carbon nanofibers) as second phases to design ceramic composites is a hot topic at present. Researchers try to provide a remarkable improvement of the parent ceramic assuming that some of the outstanding mechanical properties of these phases migrate to the resultant composite. This...
Article
BACKGROUND Pectin is heteropolysaccharide found in cell walls coming mainly from by‐products as well as citrus peels, apple and sugar beet pulp and presenting biological and techno‐functional properties. In this work a generalproximal and structural characterisation of industrial citrus pectins was done together with a study of impact of power ultr...
Article
In this research, Suspension Plasma Spraying (SPS) technique was used for the thermal deposition of a multicomponent mixture made up of an Y-TZP/Al2O3 matrix with SiC particles. Two suspensions of Y-TZP and Al2O3 with different SiC particles content (6 wt% and 12 wt%) were tested as feedstocks in the SPS process. Three stand-off distances were vari...
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
In order to obtain thermal barrier coatings by Suspension Plasma Spraying (SPS) process with potential new self-healing ability multicomponent submicronic Y-TZP/Al2O3/SiC suspensions were prepared. For this purpose, concentrated aqueous suspensions of individual components, as well as the multicomponent mixture were studied and characterised, in te...
Article
Li2O-SiO2-ZrO2 (LZS) glass-ceramics have high mechanical strength, hardness, resistance to abrasion and chemical attack, but also a high coefficient of thermal expansion (CTE), which can be reduced adding alumina nanoparticles. The conventional glass-ceramic production is relatively complex and energy consuming, since it requires the melting of the...
Article
A simple, soft, and fast microwave-assisted hydrothermal method was used for the preparation of nanocrystalline cobalt ferrite powders from commercially-available Fe(NO3)39H2O, Co(NO3)26H2O, ammonium hydroxide, and tetrapropylammonium hydroxide (TPAH). The synthesis was conducted in a sealed-vessel microwave reactor specifically designed for synthe...