Browsing by Author "Tundidor Camba, Alain"

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    3D-QSAR Modeling of Non-peptide Antagonists for the Human Luteinizing Hormone-releasing Hormone Receptor
    (2013) Tundidor Camba, Alain; Caballero, Julio; Coll Herrera, Deysma
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    Aromatic Polyimides Containing Cyclopropylamide Fragment as Pendant Group. A Study of the Balance Between Solubility and Structural Rigidity
    (2017) Tundidor Camba, Alain; Terraza Inostroza, Claudio; Tagle Domínguez, Luis Hernán; Coll Herrera, Deysma; Ortiz, Pablo
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    Diphenylsilane-containing linear and rigid whole aromatic poly(azomethine)s. Structural and physical characterization
    (2018) Tundidor Camba, Alain; González Enríquez, Carmen; Sarabia Vallejos, Mauricio; Tagle Domínguez, Luis Hernán; Sobarzo Aucal, Patricio Antonio; Gonzalez, A.; Hauyón Sepúlveda, René Alejandro; Mariman, A. P.; Terraza Inostroza, Claudio; Tundidor Camba, Alain; González Enríquez, Carmen; Sarabia Vallejos, Mauricio; Tagle Domínguez, Luis Hernán; Sobarzo Aucal, Patricio Antonio; Gonzalez, A.; Hauyón Sepúlveda, René Alejandro; Mariman, A. P.; Terraza Inostroza, Claudio
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    Estudios avanzados del uso de Polimetilhidrosiloxano, Polietileno Tereftalato y factores de agitación y temperatura de secado en el desempeño de placas de yeso
    (2024) Romano Matos, Victoria Enriqueta; Videla Leiva, Álvaro Rodrigo; Tundidor Camba, Alain; Pontificia Universidad Católica de Chile. Escuela de Ingeniería
    Las placas de yeso son materiales de construcción ampliamente usadas en las edificaciones por su fácil instalación y por las propiedades que aportan en las diferentes zonas donde se instalan. Las placas son fabricadas en base a la reacción de hidratación de sulfato de calcio hemihidrato (HH) a sulfato de calcio dihidrato (DH) que es el corazón endurecido de las placas de yeso. Estudios previos muestran que la incorporación de cualquier aditivo o material a la reacción de hidratación afecta en la morfología de los cristales del dihidrato formado, así como en su porosidad final. Además, la variación del tiempo de agitación durante la reacción, así como el efecto de la temperatura sobre el dihidrato formado tienen efecto sobre las propiedades del material obtenido. Esta investigación tiene dos partes, en la primera se analizó el comportamiento de un aditivo sobre la reacción de hidratación en condiciones similares a las aplicadas durante su fabricación. Un tipo de placa de yeso con propiedades de mayor resistencia a la humedad se obtiene al incorporar un aditivo con repelencia al agua, en este estudio se usa polimetilhidrosiloxano (PMHS). El estudio muestra que la porosidad y los cambios morfológicos que se presentan en los cristales de sulfato de calcio dihidrato con diferentes dosis de polimetilhidrosiloxano, las temperaturas de secado después del fragüe y los diferentes grados de homogeneidad de la mezcla, influyen significativamente en el desempeño de las placas de yeso. En la segunda parte de la investigación se estudia el desempeño de placas de yeso con polimetilhidrosiloxano incorporando residuos de microplásticos de polietileno tereftalato reciclado (PET) de manera de mejorar la resistencia al agua de las placas mediante el reúso de un residuo. Se estudia la variación de tres factores: dosis de polimetilhidrosiloxano (D), tiempo de agitación (H) y temperatura de secado después de fraguado (T). En el proceso experimental, se fabricaron y ensayaron placas de yeso para determinar la absorción de agua, la resistencia a la flexión y la conductividad térmica siguiendo una matriz de diseño experimental. Los resultados obtenidos muestran que incorporando hasta un 10% de microplásticos de polietileno tereftalato reciclado se logran cambios positivos en la absorción de agua y en la conductividad térmica. Además, se estima una disminución de 10% de emisiones de CO2 y un 5% menos de consumo de materias primas (HH, agua y PMHS) al incorporar el PET y principalmente se consume el microplástico lo que disminuye su presencia en el medioambiente. Los cambios morfológicos en los cristales fueron estudiados con las técnicas de microscopia electrónica de barrido (SEM), microanálisis por dispersión de energías de rayos-X (EDX), el programa IMAGEJ y los efectos en la porosidad con la microtomografía computarizada de rayos X (MICRO-CT).
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    Flexible oligomeric silicon-containing poly(ether-azomethine)s obtained from epoxide derivatives. Synthesis and characterization
    (2019) Tundidor Camba, Alain; Araya, Nélida; González Enríquez, Carmen; Tagle Domínguez, Luis Hernán; Hauyón Sepúlveda, René Alejandro; Sobarzo Aucal, Patricio Antonio; Rodríguez González, Fidel E.; Jessop Rivera, Ignacio; Recabarren Gajardo, Gonzalo; Terraza Inostroza, Claudio; Tundidor Camba, Alain; Araya, Nélida; González Enríquez, Carmen; Tagle Domínguez, Luis Hernán; Hauyón Sepúlveda, René Alejandro; Sobarzo Aucal, Patricio Antonio; Rodríguez González, Fidel E.; Jessop Rivera, Ignacio; Recabarren Gajardo, Gonzalo; Terraza Inostroza, Claudio
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    In-Situ Preparation of CdTe Quantum Dots Capped with beta-Cyclodextrin-Epichlorohydrin Polymer : Polymer Influence on the Nanocrystal's Optical Properties
    (2018) Martin-Trasanco, Rudy; Esparza-Ponce, Hilda E.; Ortiz Rodríguez, Pedro David; Oyarzun, Diego P.; Zuniga, Cesar; Montero-Cabrera, Maria E.; Tundidor Camba, Alain; Pizarro, Guadalupe del C.; Arratia-Perez, Ramiro
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    Influences of Recycled Polyethylene Terephthalate Microplastic on the Hygrothermal and Mechanical Performance of Plasterboard with Polymethylhydrosiloxane Content
    (MDPI, 2024) Romano Matos, Victoria Enriqueta; Tundidor Camba, Alain; Vera Araya, Sergio Eduardo; Navarrete Leschot, Iván Ignacio; Videla Leiva, Álvaro Rodrigo; CEDEUS (Chile)
    New composites produced with recycled waste are needed to manufacture more sustainable construction materials. This paper aimed to analyze the hygrothermal and mechanical performance of plasterboard with a polymethylhydrosiloxane (PMHS) content, incorporating recycled PET microplastic waste and varying factors such as PMHS dose, homogenization time, and drying temperature after setting. A cube-centered experimental design matrix was performed. The crystal morphology, porosity, fluidity, water absorption, flexural strength, and thermal conductivity of plasterboards were measured. The results showed that incorporating recycled PET microplastics does not produce a significant difference in the absorption and flexural strength of plasterboards. However, the addition of recycled PET reduced the thermal conductivity of plasterboards by around 10%.
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    LED-induced photoactivity of self-supporting chitosan-azobenzene films for light energy harvesting/storage
    (2025) Kremer Seitz, Constanza; Castillo, Pablo; Tundidor Camba, Alain; Ramírez, Oscar; Bonardd, Sebastian; Díaz Díaz, David; Leiva, Angel; Saldias, Cesar
    In this report, we conducted the synthesis, fabrication, and characterization of chitosan-azobenzene films using the solvent evaporation method. The samples were characterized through thermogravimetric analysis, differential scanning calorimetry, contact angle measurements, atomic force microscopy, and ultraviolet‒visible spectroscopy. The main goal of this study was to investigate the photoactivity of chitosan-azobenzene films utilizing LED light as a radiation source. Remarkably, employing both ultraviolet and visible light allowed us to witness the photoisomerization phenomenon of azobenzene, i.e., the direct process (trans → cis), in the films. Moreover, we investigated the reverse process (cis → trans) in the absence of light. Interestingly, this step can be executed in darkness, indicating zero energy demand for this phase of the process. The results indicated that these self-supporting materials are capable of harvesting and storing light energy.
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    New cardo silylated poly(azomethine)s containing 9,9 '-diphenylfluorene units as materials with bronsted acid-dependent fluorescence
    (2020) Hauyón Sepúlveda, René Alejandro; Garrido Gatica, Gabriela Lurdes; Sobarzo Aucal, Patricio Antonio; González Enríquez, Carmen; Tagle Domínguez, Luis Hernán; Rodríguez González, Fidel E.; Jessop Rivera, Ignacio; Recabarren Gajardo, Gonzalo; Tundidor Camba, Alain; Terraza Inostroza, Claudio
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    New Light-Green Thermally Activated Delayed Fluorescence Polymer Based on Dimethylacridine-Triphenyltriazine Light-Emitting Unit and Tetraphenylsilane Moiety as Non-Conjugated Backbone
    (MDPI, 2023) Hauyon Sepúlveda, Rene Alejandro; Sobarzo Aucal, Patricio Antonio; Medina Martínez, Jean André; Garcia, Luis; Tundidor Camba, Alain; Terraza Inostroza, Claudio Alberto; Fuentealba Patino, Denis Alberto; Pizarro, Nancy; Ortega Alfaro, María C.; Ugalde Saldívar, Víctor M.; Jessop Rivera, Ignacio Andrés; González Henríquez, Carmen
    In the search for solution-processable TADF materials as a light emitting layer for OLED devices, polymers have attracted considerable attention due to their better thermal and morphological properties in the film state with respect to small molecules. In this work, a new polymer (p-TPS-DMAC-TRZ) with thermally activated delayed fluorescence (TADF) light-emitting characteristics was prepared from a conjugation-break unit (TPS) and a well-known TADF core (DAMC-TRZ). This material was designed to preserve the photophysical properties of DAMC-TRZ, while improving other properties, such as thermal stability, promoted by its polymerization with a TPS core. Along with excellent solubility in common organic solvents such as toluene, chloroform and THF, the polymer (Mn = 9500; Mw = 15200) showed high thermal stability (TDT5% = 481 °C), and a Tg value of 265 °C, parameters higher than the reference small molecule DMAC-TRZ (TDT5% = 305 °C; Tg = 91 °C). The photoluminescence maximum of the polymer was centered at 508 nm in the solid state, showing a low redshift compared to DMAC-TRZ (500 nm), while also showing a redshift in solution with solvents of increasing polarity. Time-resolved photoluminescence of p-TPS-DMAC-TRZ at 298 K, showed considerable delayed emission in solid state, with two relatively long lifetimes, 0.290 s (0.14) and 2.06 s (0.50), and a short lifetime of 23.6 ns, while at 77 K, the delayed emission was considerably quenched, and two lifetimes in total were observed, 24.6 ns (0.80) and 180 ns (0.20), which was expected from the slower RISC process at lower temperatures, decreasing the efficiency of the delayed emission and demonstrating that p-TPS-DMAC-TRZ has a TADF emission. This is in agreement with room temperature TRPL measurements in solution, where a decrease in both lifetime and delayed contribution to total photoluminescence was observed when oxygen was present. The PLQY of the mCP blend films with 1% p-TPS-DMAC-DMAC-TRZ as a dopant was determined to be equal to 0.62, while in the pure film, it was equal to 0.29, which is lower than that observed for DMAC-TRZ (0.81). Cyclic voltammetry experiments showed similarities between p-TPS-DMAC-TRZ and DAMC-TRZ with HOMO and LUMO energies of ?5.14 eV and ?2.76 eV, respectively, establishing an electrochemical bandgap value of 2.38 eV. The thin film morphology of p-TPS-DMAC-TRZ and DMAC-TRZ was compared by AFM and FE-SEM, and the results showed that p-TPS-DMAC-TRZ has a smoother surface with fewer defects, such as aggregations. These results show that the design strategy succeeded in improving the thermal and morphological properties in the polymeric material compared to the reference small molecule, while the photophysical properties were mostly maintained, except for the PLQY determined in the pure films. Still, these results show that p-TPS-DMAC-TRZ is a good candidate for use as a light-emitting layer in OLED devices, especially when used as a host-guest mixture in suitable materials such as mCP.
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    New oligomeric poly(ether-imide)s containing diphenylsilane and dibenzofuran moieties. Synthesis and characterization
    (2018) Tundidor Camba, Alain; Tagle Domínguez, Luis Hernán; González Enríquez, Carmen; Coll Herrera, Deysma; Hauyón Sepúlveda, René Alejandro; Sobarzo Aucal, Patricio Antonio; Jessop Rivera, Ignacio; Terraza Inostroza, Claudio
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    New Poly(imide)s Bearing Alkyl Side-Chains : A Study on the Impact of Size and Shape of Lateral Groups on Thermal, Mechanical, and Gas Transport Properties
    (2020) Rodríguez González, Fidel E.; Pérez, G.; Niebla Morejón, Vladimir; Jessop Rivera, Ignacio; Martín Trasanco, R.; Coll Herrera, Deysma; Aguilar Vega, M.; Tagle Domínguez, Luis Hernán; Terraza Inostroza, Claudio; Tundidor Camba, Alain; Ortiz, P.
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    New thiophene-based poly(azomethine)s bearing tetraphenylsilane moieties along their backbone. Optical, electronic, thermal properties and theoretical calculations
    (2020) Sobarzo Aucal, Patricio Antonio; Jessop Rivera, Ignacio; Mariman, A. P.; Gonzalez, A. F.; Saldias, C.; Schott Verdugo, Eduardo Enrique; Zarate, X.; Hauyón Sepúlveda, René Alejandro; Recabarren Gajardo, Gonzalo; Terraza Inostroza, Claudio; González Enríquez, Carmen; Tundidor Camba, Alain
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    New triphenylamine-based oligomeric schiff bases containing tetraphenylsilane moieties in the backbone
    (2019) Sobarzo Aucal, Patricio Antonio; Gonzalez, A.F.; Schott Verdugo, Eduardo Enrique; Tagle Domínguez, Luis Hernán; Tundidor Camba, Alain; González Enríquez, Carmen; Jessop Rivera, Ignacio; Terraza Inostroza, Claudio
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    Novel aromatic polyimides derived from 2,8-di(3-aminophenyl) dibenzofuran. Synthesis, characterization and evaluation of properties
    (2015) Tundidor Camba, Alain; Terraza Inostroza, Claudio; Tagle Domínguez, Luis Hernán; Coll Herrera, Deysma; Ortiz Álvarez, Pablo Andrés; De Abajo, J.; Maya, E.
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    Oligomeric poly(ether-imide)s bearing ortho trifluoromethyl groups: solubility, thermal studies, and optical properties
    (2018) Jessop, L.; Tagle Domínguez, Luis Hernán; Coll Herrera, Deysma; Ortiz Álvarez, Pablo Andrés; Pérez Quintana, Germán Miguel; Terraza Inostroza, Claudio; Tundidor Camba, Alain
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    Oligomeric silicon-containing poly(imide-amides) derivaded from diacids with 1,8-naphthalimidyl and aminoi acids side groups. Synthesis and characterization
    (2014) Tagle Domínguez, Luis Hernán; Terraza Inostroza, Claudio; Tundidor Camba, Alain; Lara Faure, Francisco Antonio
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    PANI branches onto donor-acceptor copolymers : synthesis, characterization and electroluminescent properties of new 2D-materials
    (2018) Jessop Rivera, Ignacio; Díaz, Fernando R.; Terraza Inostroza, Claudio; Tundidor Camba, Alain; Leiva Campusano, Ángel; Cattin, L.; Bernede, J.