https://hdl.handle.net/10259/4313 2026-09-09T15:43:54Z 2026-09-09T15:43:54Z Urbaneja Miguel, Álvaro Torija López, Alba Carrancho Alonso, Ángel Iriarte Avilés, Eneko González Moreno, Sara González Martín, José Manuel Trigo López, Miriam Vallejos Calzada, Saúl https://hdl.handle.net/10259/12054 2026-09-09T09:27:18Z 2026-07-31T00:00:00Z

UBU-Polymers Research Group 12122025 Urbaneja Miguel, Álvaro; Torija López, Alba; Carrancho Alonso, Ángel; Iriarte Avilés, Eneko; González Moreno, Sara; González Martín, José Manuel; Trigo López, Miriam; Vallejos Calzada, Saúl The dataset contains all raw data of the work "Atmosphere-controlled thermal processing enables tunable optical properties via iron-oxide phase engineering in natural silicate materials"

2026-07-31T00:00:00Z Urbaneja Miguel, Álvaro Torija López, Alba Carrancho Alonso, Ángel Iriarte Avilés, Eneko González Moreno, Sara González Martín, José Manuel Trigo López, Miriam Vallejos Calzada, Saúl https://hdl.handle.net/10259/11978 2026-08-28T00:05:21Z 2026-05-29T00:00:00Z

Atmosphere-controlled thermal processing enables tunable optical properties via iron-oxide phase engineering in natural silicate materials Urbaneja Miguel, Álvaro; Torija López, Alba; Carrancho Alonso, Ángel; Iriarte Avilés, Eneko; González Moreno, Sara; González Martín, José Manuel; Trigo López, Miriam; Vallejos Calzada, Saúl Controlled-atmosphere thermal processing was investigated as a method to engineer iron-oxide phase assemblages in iron-bearing silicate materials. Natural sandstone was heated between 200 and 1000 °C under air, N2 and CO2 atmospheres to evaluate how oxygen partial pressure governs redox transformations and the resulting macroscopic optical behaviour. The treatments produced a wide and reproducible range of optical responses from a single starting material. Colour evolution, quantified in the CIELAB space, correlates with bulk mineral transformations. Oxidizing conditions stabilize hematite-dominated assemblages and generate red hues, whereas reduced-oxygen atmospheres promote magnetite formation and progressive darkening. Rock-magnetic measurements identify atmosphere-dependent phase assemblages, including a high-coercivity iron oxide under strongly oxidizing conditions. The magnetic response mirrors the optical evolution, indicating that colour development originates from internal phase transformations. Compressive strength remained within the same order of magnitude as the untreated material across the studied conditions, indicating no catastrophic mechanical degradation. These results show that oxygen availability acts as a key processing variable controlling iron-oxide stability and optical response. The study establishes a process-based approach for tuning optical properties in mineral materials through atmosphere-controlled thermal processing without chemical additives. Unlike previous studies focused on temperature-driven effects or isolated observations, this work demonstrates a reproducible process-based approach to tune optical properties in natural silicate materials through controlled atmosphere engineering.

2026-05-29T00:00:00Z Vallejo García, Jorge Lucas Trigo López, Miriam Ibeas Cortes, Saturnino Torija López, Alba Busto Núñez, Mª Dolores Pilar Izquierdo, María Concepción López, Gloria Sánchez, Carlos Vallejos Calzada, Saúl https://hdl.handle.net/10259/11892 2026-07-02T07:06:11Z 2026-05-11T00:00:00Z

Dataset UBU-Polymers Research Group 05122025 Vallejo García, Jorge Lucas; Trigo López, Miriam; Ibeas Cortes, Saturnino; Torija López, Alba; Busto Núñez, Mª Dolores; Pilar Izquierdo, María Concepción; López, Gloria; Sánchez, Carlos; Vallejos Calzada, Saúl The dataset contains all raw data of the work "Dual-Range Colorimetric Protein Quantification in Whey and WPC Using a Smart Polymeric Film and RGB Imaging"

2026-05-11T00:00:00Z Vallejo García, Jorge Lucas Trigo López, Miriam Ibeas Cortes, Saturnino Torija López, Alba Busto Núñez, Mª Dolores Pilar Izquierdo, María Concepción López, Gloria Sánchez, Carlos Vallejos Calzada, Saúl https://hdl.handle.net/10259/11890 2026-07-02T00:05:35Z 2026-06-01T00:00:00Z

Dual-range colorimetric protein quantification in whey and WPC using a smart polymeric film and RGB imaging Vallejo García, Jorge Lucas; Trigo López, Miriam; Ibeas Cortes, Saturnino; Torija López, Alba; Busto Núñez, Mª Dolores; Pilar Izquierdo, María Concepción; López, Gloria; Sánchez, Carlos; Vallejos Calzada, Saúl Whey is an important dairy by-product whose protein content must be accurately determined for quality control and fraud detection. Conventional nitrogen-based methods (e.g., Kjeldahl) require laboratory equipment and overestimate protein in the presence of non-protein nitrogen compounds. Here, we report a rapid analytical approach based on a smart polymeric film (FRGB) prepared by diazotisation–azo coupling chemistry. The film reacts with aromatic residues of whey proteins, producing a colour change quantifiable from a smartphone image. The sensor displays a dual-range response: the blue channel provides high sensitivity at low concentrations, whereas the green channel remains linear at high concentrations, enabling direct analysis of whey protein concentrate without dilution. The method showed excellent linearity (R2 = 0.99) in whey and commercial WPC over 0–120 mg·mL−1, with a detection limit of 0.284 mg·mL−1 and recovery rate of 94 ± 1.46%. Non-protein nitrogen compounds did not interfere, allowing rapid screening and preliminary authenticity assessment of whey-derived products.

2026-06-01T00:00:00Z