Resultados de investigación

Video S2, the motion of Fe2O3-Pt-TiO2 under dark and blue light illumination in 0.1% H2O2, Photocatalytic micro/nanomotors have emerged as promising tools for environmental remediation, biosensing, and targeted delivery. To enhance their light-driven propulsion, significant efforts have focused on engineering semiconductor heterostructures, which promote charge separation. However, a clear understanding of how these architectures govern photocatalytic mechanisms and influence motion performance remains limited. Here, we design a visible light-responsive nanomotor based on a Fe2O3-Pt-TiO2 trilayered heterostructure, combining narrow-bandgap α-Fe2O3 and wide-bandgap TiO2 with an intermediate Pt layer. Remarkably, Fe2O3-TiO2 nanomotors without the Pt layer exhibit only modest propulsion under visible light, whereas the inclusion of Pt significantly enhances their motility. Through advanced techniques, including in situ synchrotron radiation-based near-ambient pressure X-ray photoelectron spectroscopy and transient absorption spectroscopy, we reveal that Pt serves as an efficient electron mediator, enabling directional charge transfer across the heterojunction. This study provides fundamental insights into charge transport in multicomponent nanomotors and introduces a rational strategy for designing efficient photoactive systems., Peer reviewed

Additional data on the preparation and characterization of electrochromic materials and devices, Extending the spectral response of viologen-based electrochromic devices to the near-infrared region is essential to enhance their performance for smart window applications. Although synthetic and formulation modifications have been proposed to achieve this goal, these strategies always come at the expense of deteriorating the electrochromic behavior of the system. To overcome this limitation, herein we exploited the supramolecular chemistry of viologen molecular tweezers, which undergo an intramolecular dimerization process upon reduction that leads to broad light absorption through the visible and near-infrared spectra. We observed this behavior to take place at low concentrations in a variety of electrolytic media, including solid-state ionogels that could be applied to the fabrication of electrochromic devices. Better spectral response, lower operation voltage, and higher stability were measured for these devices relative to analogous systems based on viologen monomers. As a result, when used as electrochromic smart windows, the viologen tweezer-based devices exhibited enhanced modulation of solar heat gain with reduced energy consumption, thereby demonstrating the potential of viologen supramolecular chemistry to rationally improve the performance of electrochromic devices., Peer reviewed

1) Experimental Section S2-S3; 2) Water adsorption isotherms S4; 3) Thermogravimetric analysis S5; 4) Magnetic measurements S6; 5) Crystal data, structural refinement, and selected distances S7-S9; 6) Structural changes with H2O loss/uptake S10; 7) Framework volume decrease and SQUID S11; 8) DFT calculations S12-S13; 9) References S14, Peer reviewed

Experimental section; additional electrochemical measurements; material characterizations; and theoretical calculations, Peer reviewed

It contains: schematics of structure, lab-scale synthesis optimization study, Miller indices calculations, SEM images, TGA equations, N2 adsorption method, water vapor adsorption setup schematics and breakthrough results, coating trials, H2 adsorption trials on a pellet, and density vs porosity calculations for a pellet, This study presents a spray-drying Al-fumarate synthesis that allows simultaneous synthesis and workup. This all-in-one step synthesis produces calibrated Al-fumarate grains of high quality without the need for further processing. Obtained materials are characterized by PXRD, TGA, N2 and H2O adsorption, PSD, and microscopy imaging. The synthesis has been upscaled to the 60 kg scale. Whereas all reported synthesis routes in the aqueous phase proceed in base conditions by addition of NaOH, the synthesis reported herein is obtained at a pH below 3, with aluminum isopropoxide acting as a base that can steadily react with fumaric acid without the need for pH adjustment. Major differences in the large meso- to macroporous structure are observed depending on the drying process, with an absence of intergranular porosity for the spray-dried pilot batch, reflecting the high-density nature of the obtained MOF powder. Large productivity can be achieved at spray-driers due to their important evaporation capacity (up to several hundreds of tons of/h), opening the perspectives of mass production of Al-fumarate. Air dehumidification in a fluidized bed is carried out as a proof-of-concept application. The fluidized bed’s breakthrough curve profile, with a longer t50%, is in line with a better column isothermicity, connected to the fluidization conditions. Ultimately, we developed a comprehensive 3-in-1 process that integrates synthesis, drying, and shaping while also exploring its potential for production intensification. We believe that this synthesis approach could pave the way for the scalable production of other Al-MOFs, a topic currently under investigation., Peer reviewed

Fluidization video, This study presents a spray-drying Al-fumarate synthesis that allows simultaneous synthesis and workup. This all-in-one step synthesis produces calibrated Al-fumarate grains of high quality without the need for further processing. Obtained materials are characterized by PXRD, TGA, N2 and H2O adsorption, PSD, and microscopy imaging. The synthesis has been upscaled to the 60 kg scale. Whereas all reported synthesis routes in the aqueous phase proceed in base conditions by addition of NaOH, the synthesis reported herein is obtained at a pH below 3, with aluminum isopropoxide acting as a base that can steadily react with fumaric acid without the need for pH adjustment. Major differences in the large meso- to macroporous structure are observed depending on the drying process, with an absence of intergranular porosity for the spray-dried pilot batch, reflecting the high-density nature of the obtained MOF powder. Large productivity can be achieved at spray-driers due to their important evaporation capacity (up to several hundreds of tons of/h), opening the perspectives of mass production of Al-fumarate. Air dehumidification in a fluidized bed is carried out as a proof-of-concept application. The fluidized bed’s breakthrough curve profile, with a longer t50%, is in line with a better column isothermicity, connected to the fluidization conditions. Ultimately, we developed a comprehensive 3-in-1 process that integrates synthesis, drying, and shaping while also exploring its potential for production intensification. We believe that this synthesis approach could pave the way for the scalable production of other Al-MOFs, a topic currently under investigation., Peer reviewed

Upscaled MOF flow properties video, This study presents a spray-drying Al-fumarate synthesis that allows simultaneous synthesis and workup. This all-in-one step synthesis produces calibrated Al-fumarate grains of high quality without the need for further processing. Obtained materials are characterized by PXRD, TGA, N2 and H2O adsorption, PSD, and microscopy imaging. The synthesis has been upscaled to the 60 kg scale. Whereas all reported synthesis routes in the aqueous phase proceed in base conditions by addition of NaOH, the synthesis reported herein is obtained at a pH below 3, with aluminum isopropoxide acting as a base that can steadily react with fumaric acid without the need for pH adjustment. Major differences in the large meso- to macroporous structure are observed depending on the drying process, with an absence of intergranular porosity for the spray-dried pilot batch, reflecting the high-density nature of the obtained MOF powder. Large productivity can be achieved at spray-driers due to their important evaporation capacity (up to several hundreds of tons of/h), opening the perspectives of mass production of Al-fumarate. Air dehumidification in a fluidized bed is carried out as a proof-of-concept application. The fluidized bed’s breakthrough curve profile, with a longer t50%, is in line with a better column isothermicity, connected to the fluidization conditions. Ultimately, we developed a comprehensive 3-in-1 process that integrates synthesis, drying, and shaping while also exploring its potential for production intensification. We believe that this synthesis approach could pave the way for the scalable production of other Al-MOFs, a topic currently under investigation., Peer reviewed

S1: Topography and functional characterization of BaTiO3 single crystal by AFM and PFM; S2: Determination of optimal K for clustering; S3: Band excitation centroids; S4: Calculation of Young’s modulus from experimental mechanical responses; S5: Tip wearing after the measurements; S6: Analysis of domain wall contribution of subresolution bubble domains, Flexoelectric fields produced by strong strain gradients at the nanoscale couple to ferroelectric polarization, promoting changes in the mechanical properties of ferroelectric materials as a function of the direction of the ferroelectric polarization. In this work, we calculate the asymmetry in the Young’s modulus found in oppositely polarized out-of-plane domains of BaTiO3 single crystals by means of contact resonance AFM, and we evaluate its impact on the electromechanical response as measured by piezoresponse force microscopy, both using band excitation modes. We analyze the electromechanical response of the different BaTiO3 domains using k-means to build up their mean elastic and electromechanical features and quantify the flexoelectrically induced modulation of the Young’s modulus. Finally, we discuss the use of contact Kelvin probe force microscope measurements to decouple electrostatic artifacts from purely piezoelectric ones when flexoelectric coupling appears., Peer reviewed

This dataset includes experimental images of a chemiluminescent reaction taking place across the salt-freshwater interface. Images are provided for several steady state saltwater wedges., European Commission ENIGMA - European training Network for In situ imaGing of dynaMic processes in heterogeneous subsurfAce environments 722028, Peer reviewed

Suplementary tables, Table SI.1. Percentage of root mycirrihization. C (Control soil); Mar (marble); DOR (biotransformed dry olive residue); Azn (Rhizoglomus sp.); Custo (Rhizoglomus custos); Intra (Rhizophagus irregularis). Data are presented as mean ± standard deviation, n=7. For each percentage of root mycirrihization, lowercase letters indicate significant differences according to LSD test (p<0.05). Table SI.2. Concentration of: A) soluble metals extracted with water (1:2.5, soil:water) and B) Bioavailable metals extracted with EDTA (1:10, soil:EDTA) in soil subjected to different treatments. C (Control soil); Mar (marble); DOR (biotransformed dry olive residue); Azn (Rhizoglomus sp.); Custo (Rhizoglomus custos); Intra (Rhizophagus irregularis). Data are presented as mean ± standard deviation. Pb values are not shown because were below the detection limits. Table SI.3. Bioaccumulation index in roots and above ground, and translocation factor. C (Control soil); Mar (marble); DOR (biotransformed dry olive residue); Azn (Rhizoglomus sp.); Custo (Rhizoglomus custos); Intra (Rhizophagus irregularis). Table SI.4. Weights of Variables in Principal Component Analysis. Soil enzymatic activity (β-glucosidase, dehydrogenase, phosphatase, urease); plant enzymatic activity (CAT, APX, GR); soil physicochemical properties (pH, EC, %CO, %MO, C/N, %CaCO3); vegetative response variables (photosystem II efficiency, stomacal conductance, root weight, aerial weight, spike weight, ); soil metals [bioavailable (Co B, As B, Cr B, Cd B, Ni B, Cu B, Zn B), soluble (Co S, As S, Cr S, Cd S, Ni S, Cu S, Zn S), total (Co, As, Cr, Cd, Pb, Ni, Cu, Zn)]; plant metals [aerial (PCo, PAs, PCr, PCd, PPb, PNi, PCu, PZn), root (RCo, RAs, RCr, RCd, RPb, RNi, RCu, RZn)]; and percentage of mycorrhization (%mycorrhiza)., Peer reviewed