Browsing by Author "Pavez Guerrero, Paulina Isabel"
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- ItemA ternary eutectic solvent for cellulose nanocrystal production: exploring the recyclability and pre-pilot scale-up(2023) Mariño, Mayra A. ; Paredes Gutierrez, Maria Gabriela; Martinez Ahumada, Natalia del Pilar; Millan, Daniela ; Tapia, Ricardo A. ; Ruiz, Domingo ; Isaacs Casanova, Mauricio Alejandro; Pavez Guerrero, Paulina IsabelDeep eutectic solvents (DES) formed using choline chloride (ChCl), p-toluenesulfonic acid (pTSA) of stoichiometry ChCl: pTSA (1:1) and (1:2), and its ternary eutectic mixtures with phosphoric acid (PA) 85% as an additive (ChCl: pTSA: PA) were evaluated for cellulose nanocrystal (CNC) isolation. Initially, the hydrolytic efficiency to produce CNC of each DES was compared before and after adding phosphoric acid by Hammett acidity parameters and the Gutmann acceptor number. Moreover, different DES molar ratios and reaction time were studied at 80°C for CNC optimization. The nanomaterial characteristics were analyzed by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetric analysis (TGA). The ternary eutectic mixture ChCl: pTSA: PA molar ratio (1:1:1.35) was chosen as a suitable recyclable ternary system at the laboratory scale. A CNC yield of about 80% was obtained from the hydrolysis of commercial cellulose in five cycles of recovery, but it dropped to 35% in pre-pilot scaling. However, no variation in the average size of the resulting CNC was observed (132 ± 50 nm x 23 ± 4 nm), which presented high thermal stability (Tmax 362°C) and high crystallinity of about 80% after 3 h of reaction time.
- ItemCholine [Amino Acid] Ionic Liquid/Water Mixtures : A Triple Effect for the Degradation of an Organophosphorus Pesticide(2020) Pavez Guerrero, Paulina Isabel; Figueroa, R.; Medina, M.; Millan, D.; Falcone, R. D.; Tapia Apati, Ricardo
- ItemConcerted mechanisms of the reactions of ethyl S-aryl thiocarbonates with substituted phenoxide ions(1999) Castro R., Enrique; Pavez Guerrero, Paulina Isabel; Santos Blanco, José Guillermo
- ItemConcerted mechanisms of the reactions of methyl aryl carbonates with substituted phenoxide ions(2001) Castro R., Enrique; Pavez Guerrero, Paulina Isabel; Santos Blanco, José Guillermo
- ItemCoumarin-Based Fluorescent Probes for Dual Recognition of Copper(II) and Iron(III) Ions and Their Application in Bio-Imaging(2014) Martínez Ahumada, Natalia del Pilar; Pavez Guerrero, Paulina Isabel; Aliaga Miranda, Margarita Elly; García Beltrán, Olimpo; Cassels, Bruce K.; Pérez, Claudio; Mena, Natalia; Núñez, Marcos T.
- ItemCucurbit[7]uril limits the binding of coumarin bearing alkyl-acetoacetate with mercury and stimulates the desulphurisation reaction of its sulphur analog(2020) Aliaga Miranda, Margarita Elly; Pavez Guerrero, Paulina Isabel; Quintero Faúndez, Guillermo; Droguett Muñoz, Kevin; Cañete, Á.; Santos Blanco, José Guillermo
- ItemDephosphorylation Reactions of Mono-, Di-, and Triesters of 2,4-Dinitrophenyl Phosphate with Deferoxamine and Benzohydroxamic Acid(2012) Medeiros, Michelle; Orth, Elisa S.; Manfredi, Alex M.; Pavez Guerrero, Paulina Isabel; Micke, Gustavo A.; Kirby, Anthony J.; Nome, Faruk
- ItemDual function of amino acid ionic liquids (Bmim[AA]) on the degradation of the organophosphorus pesticide, Paraoxon®(2018) Morales Oyarzún, Javiera Ignacia; Figueroa, Roberto; Rojas Guerrero, Mabel Natalia; Millán Retamal, Daniela Andrea; Tapia Apati, Ricardo; Pavez Guerrero, Paulina Isabel
- ItemDual Nucleophilic Substitution Reactions of O,O diethyl 2,4-dinitrophenyl Phosphate and Thionophosphate Triesters(2013) Aguayo Burdiles, Raúl Claudio; Arias, Felipe; Cañete Molina, Álvaro; Zúñiga López, María Carolina; Castro R., Enrique; Pavez Guerrero, Paulina Isabel; Santos, José G.; Aguayo Burdiles, Raúl Claudio; Arias, Felipe; Cañete Molina, Alvaro Félix; Zúñiga López, María Carolina; Castro R., Enrique; Pavez Guerrero, Paulina Isabel; Santos, José G.
- Item(E)-2-(Benzo[d]thiazol-2-yl)-3-heteroarylacrylonitriles as efficient Michael acceptors for cysteine : real application in biological imaging(2014) De La Torre, P.; García Beltrán, O.; Tiznado, W.; Mena, N.; Saavedra, L.; Cabrera, M.; Trilleras, J.; Pavez Guerrero, Paulina Isabel; Aliaga Miranda, Margarita Elly
- ItemEffect of amino acid addition on the micelle formation of the surface-active ionic liquid 1-tetradecyl-3-methylimidazolium bromide in aqueous solution(2019) Rojas Guerrero, Mabel Natalia; Miskolczy, Zsombor; Biczok, Laszlo; Pavez Guerrero, Paulina Isabel
- ItemExperimental and theoretical studies on the nucleofugality ratio in the aminolysis reactions of O-(4-cyanophenyl) O-(3-nitrophenyl) thionocarbonate with amines in aqueous ethanol(2017) Montecinos Escobar, Rodrigo Andrés; Aliaga Miranda, Margarita Elly; Pavez Guerrero, Paulina Isabel; Santos Martín, José Luis
- ItemGreen Solvents as a Promising Approach to Degradation of Organophosphorate Pesticides(2016) Pavez Guerrero, Paulina Isabel; Oliva, G.; Milian, D.
- ItemInfluence of the ionic liquid on the rate and the mechanism of reaction of p-nitrophenyl acetate with secondary alicyclic amines(2013) Millán Retamal, Daniela Andrea; Rojas Guerrero, Mabel Natalia; Pavez Guerrero, Paulina Isabel; Isaacs Casanova, Mauricio; Díaz Navarro, Carlos Patricio; Santos, José G.
- ItemKinetic and theoretical study on nucleofugality in the phenolysis of 3-nitrophenyl and 4-nitrophenyl 4-cyanophenyl thionocarbonates(2013) Castro R., Enrique; Cañete Molina, Álvaro; Campodónico Galdames, Paola Rossana; Cepeda, M.; Pavez Guerrero, Paulina Isabel; Contreras, R.; Santos, José G.
- ItemKinetic investigation of the phenolysis of phenyl 4-nitrophenyl and phenyl 2,4-dinitrophenylcarbonates(2001) Castro R., Enrique; Angel, Mauricio; Pavez Guerrero, Paulina Isabel; Santos Blanco, José Guillermo
- ItemKinetic study of the phenolysis of O-methyl and O-phenyl O-2,4-dinitrophenyl thiocarbonates and O-ethyl 2,4-dinitrophenyl dithiocarbonate(2003) Castro R., Enrique; Arellano, David; Pavez Guerrero, Paulina Isabel; Santos Blanco, José Guillermo
- ItemKinetics and mechanism of the aminolysis of bis (4-nitrophenyl) carbonate and O-(4-nitropheny) S-(4-nitrophenyl) thio and dithiocarbonate(2014) Castro R., Enrique; Aliaga Miranda, Margarita Elly; Gazitúa López, Marcela Ivonne; Pavez Guerrero, Paulina Isabel; Santos, José G.
- ItemKinetics and mechanism of the benzenethiolysis of 2,4-dinitrophenyl and 2,4,6-trinitrophenyl methyl carbonates and S-(2,4-dinitrophenyl) and S-(2,4,6-trinitrophenyl) ethyl thiolcarbonates(2003) Castro R., Enrique; Pavez Guerrero, Paulina Isabel; Santos Blanco, José Guillermo
- ItemKinetics and mechanism of the benzenethiolysis of O-ethyl S-(2,4-dinitrophenyl) and O-ethyl S-(2,4,6-trinitrophenyl) dithiocarbonates and O-methyl O-(2,4-dinitrophenyl) thiocarbonate(2003) Castro R., Enrique; Pavez Guerrero, Paulina Isabel; Santos Blanco, José Guillermo