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A.E. Rodríguez-Salazar
Instituto Politécnico Nacional, CICATA Querétaro, Cerro Blanco 141, Col. Colinas del Cimatario, C.P. 76090, Santiago de Querétaro, Querétaro. México

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Journal article
Published: 26 July 2021 in Journal of Materials Research and Technology
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The aim of this work is to evaluate the effect of adding different amounts of SiO2 nanoparticles (NPs) during the synthesis of polylactic acid (PLA) and polypropylene (PP) blends on the proccesability. The analysis was carried out in terms of the morphological, rheological and mechanical properties as well as their potential applications for packaging. To reach this goal, it was initially realized an optimization of sol-gel parameters to produce of SiO2 NPs with a particle size < 20 nm. Thereafter, different quantities of SiO2 NPs (1, 2, 3, 5 wt.%) were incorporated into PLA matrix through melt mixing process to achieve pellets and finally, it was realized the polymer blend to produce PP100-x(PLA-SiO2)x nanocomposites (x = 5, 10 and 20 wt.%, of PLA-SiO2 pellets). It was found that the addition of SiO2 into PLA matrix improves the crystallinity percentage, from 10 to 77%, depending on the SiO2 quantity; however, it also restricts the movement of PLA chains favoring a viscous behavior. A high dispersion of PLA-SiO2 systems into PP matrix was obtained in composites containing 1 wt.% of SiO2. The presence of inorganic nanostructures modified the dipole-dipole interaction between organic components affecting the microstructure and thermal stability (lower Td). The observed interaction and high dispersion with low amounts of SiO2 NPs (1 wt.%), led to improve the interfacial miscibility, which in turn enhanced the mechanical properties in the PP90(PLA-SiO2)10 nanocomposites, compared to PP and PLA. The results indicate that at the end of product shelf-life, this composition can promote a faster degradation in contrast with pure PP and PP-PLA composites.

ACS Style

D. Palma-Ramírez; A.M. Torres-Huerta; M.A. Domínguez-Crespo; J.S. Ponce-Hernández; S.B. Brachetti-Sibaja; A.E. Rodríguez-Salazar; V. Urdapilleta-Inchaurregui. An assembly strategy of polylactic acid (PLA)-SiO2 nanocomposites embedded in polypropylene (PP) matrix. Journal of Materials Research and Technology 2021, 14, 2150 -2164.

AMA Style

D. Palma-Ramírez, A.M. Torres-Huerta, M.A. Domínguez-Crespo, J.S. Ponce-Hernández, S.B. Brachetti-Sibaja, A.E. Rodríguez-Salazar, V. Urdapilleta-Inchaurregui. An assembly strategy of polylactic acid (PLA)-SiO2 nanocomposites embedded in polypropylene (PP) matrix. Journal of Materials Research and Technology. 2021; 14 ():2150-2164.

Chicago/Turabian Style

D. Palma-Ramírez; A.M. Torres-Huerta; M.A. Domínguez-Crespo; J.S. Ponce-Hernández; S.B. Brachetti-Sibaja; A.E. Rodríguez-Salazar; V. Urdapilleta-Inchaurregui. 2021. "An assembly strategy of polylactic acid (PLA)-SiO2 nanocomposites embedded in polypropylene (PP) matrix." Journal of Materials Research and Technology 14, no. : 2150-2164.

Journal article
Published: 11 June 2021 in Sustainability
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Academy–industry collaborations (AICs) play a crucial role in the creation of new knowledge, by transferring this knowledge to the society and bringing into line theory and practice. Although in the state-of-the-art exists a number of efforts to analyze different factors that influence these collaborations, little attention has been paid in the application of dynamic capabilities (DCs) as an emerging tool to identify strategic elements in public research institutes (PRIs). Aiming to fill this literature gap, in this study, DCs methodology was applied to the Mexican PRI in order to classify the research activities into these strategies. A second stage was carried out to determine the influence of each DC in the global productivity and knowledge integration or transfer. The relationship between the variables was statistically analyzed using one-way analysis of variance (ANOVA) and Pearson’s correlation coefficient. The main findings of this study showed that sensing and reconfiguration capabilities have a direct interaction on the global productivity and knowledge integration or transfer of the Mexican PRI, whereas the seizing capabilities present a weak impact on these items. The proper application of the DCs framework, as a substantial instrument for the PRI, opens up an alternative to identify that the main activities should receive special attention during the strategic planning process. These strategies can improve academy–industry collaborations by promoting the process of global knowledge and technology development.

ACS Style

A. Rodríguez Salazar; M. Domínguez-Crespo; A. Torres-Huerta; A. Licona-Aguilar; A. Nivón-Pellón; V. Orta-Guzmán. Analysis of the Dynamical Capabilities into the Public Research Institutes to Their Strategic Decision-Making. Sustainability 2021, 13, 6672 .

AMA Style

A. Rodríguez Salazar, M. Domínguez-Crespo, A. Torres-Huerta, A. Licona-Aguilar, A. Nivón-Pellón, V. Orta-Guzmán. Analysis of the Dynamical Capabilities into the Public Research Institutes to Their Strategic Decision-Making. Sustainability. 2021; 13 (12):6672.

Chicago/Turabian Style

A. Rodríguez Salazar; M. Domínguez-Crespo; A. Torres-Huerta; A. Licona-Aguilar; A. Nivón-Pellón; V. Orta-Guzmán. 2021. "Analysis of the Dynamical Capabilities into the Public Research Institutes to Their Strategic Decision-Making." Sustainability 13, no. 12: 6672.

Journal article
Published: 22 January 2021 in Agronomy
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Traditionally, biochar is generally proposed to substitute Canadian Sphagnum peat moss. Sugarcane bagasse, filter press mud and sugarcane bagasse ash were mixed in different ratios and proposed as an alternative to substitute commercial Sphagnum peat moss (SPM) for the soilless cultivation of tomato (S. lycopersicum Linnaeus). The choice of the agroindustrial waste ratio was performed from physical-chemical sample characterization. During vegetable production, an adequate ratio was evaluated based on plant height, substrate pH, number of leaves, yield, and fruit size. The addition of essential macro- and micro-nutrients was performed manually. The results show that as-received materials contain different minerals with a structure that corresponds to the quartz, cristobalite, and feldspar phases. A morphology composed of lamellate structures was observed for sugarcane bagasse, whereas the filter press mud and the sugarcane bagasse ash presented compact agglomerates with a surface area of 1.60, 3.78, and 1.07 m2 g−1, respectively. The properties of each component promote the water adsorption, retention and releasing capacity. Important differences were observed as the quantity of filter press mud increased, but also it is required an amount of sugarcane bagasse above of 18 wt% to reach a superior performance. This work demonstrated that, in adequate quantities, agroindustrial wastes can be used as a soilless substrate for growing tomatoes in greenhouse, reducing their disposal problems.

ACS Style

Vanessa Natalie Orta-Guzmán; Jorge Aurelio Lois-Correa; Miguel Antonio Domínguez-Crespo; Joel Pineda-Pineda; Aidé Minerva Torres-Huerta; Adela Eugenia Rodríguez-Salazar; Ángeles Iveth Licona-Aguilar. Evaluation of Sugarcane Agroindustrial Wastes as Substrate in Soilless Cultivation of Tomato (S. lycopersicum Linnaeus): Effect of Substrate Composition on Yield Production. Agronomy 2021, 11, 206 .

AMA Style

Vanessa Natalie Orta-Guzmán, Jorge Aurelio Lois-Correa, Miguel Antonio Domínguez-Crespo, Joel Pineda-Pineda, Aidé Minerva Torres-Huerta, Adela Eugenia Rodríguez-Salazar, Ángeles Iveth Licona-Aguilar. Evaluation of Sugarcane Agroindustrial Wastes as Substrate in Soilless Cultivation of Tomato (S. lycopersicum Linnaeus): Effect of Substrate Composition on Yield Production. Agronomy. 2021; 11 (2):206.

Chicago/Turabian Style

Vanessa Natalie Orta-Guzmán; Jorge Aurelio Lois-Correa; Miguel Antonio Domínguez-Crespo; Joel Pineda-Pineda; Aidé Minerva Torres-Huerta; Adela Eugenia Rodríguez-Salazar; Ángeles Iveth Licona-Aguilar. 2021. "Evaluation of Sugarcane Agroindustrial Wastes as Substrate in Soilless Cultivation of Tomato (S. lycopersicum Linnaeus): Effect of Substrate Composition on Yield Production." Agronomy 11, no. 2: 206.

Journal article
Published: 22 January 2021 in Polymers
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In this work, the optimal conditions of synthesizing and purifying carbon nanotubes (CNTs) from ferrocene were selected at the first stage, where decomposition time, argon fluxes, precursor amounts, decomposition temperature (at 1023 K and 1123 K), and purification process (HNO3 + H2SO4 or HCl + H2O2), were modulated through chemical vapor deposition (CVD) and compared to commercial CNTs. The processing temperature at 1123 K and the treatment with HCl + H2O2 were key parameters influencing the purity, crystallinity, stability, and optical/electrical properties of bamboo-like morphology CNTs. Selected multiwalled CNTs (MWCNTs), from 1 to 20 wt%, were electropolymerized through in-situ polarization with conductive polymers (CPs), poly(aniline) (PANI) and poly(pyrrole) (PPy), for obtaining composites. In terms of structural stability and electrical properties, MWCNTs obtained by CVD were found to be better than commercial ones for producing CPs composites. The CNTs addition in both polymeric matrixes was of 6.5 wt%. In both systems, crystallinity degree, related to the alignment of PC chains on MWCNTs surface, was improved. Electrical conductivity, in terms of the carrier density and mobility, was adequately enhanced with CVD CNTs, which were even better than the evaluated commercial CNTs. The findings of this study demonstrate that synergistic effects among the hydrogen bonds, stability, and conductivity are better in PANI/MWCNTs than in PPy/MWCNTs composites, which open a promissory route to prepare materials for different technological applications.

ACS Style

Silvia Brachetti-Sibaja; Diana Palma-Ramírez; Aidé Torres-Huerta; Miguel Domínguez-Crespo; Héctor Dorantes-Rosales; Adela Rodríguez-Salazar; Esther Ramírez-Meneses. CVD Conditions for MWCNTs Production and Their Effects on the Optical and Electrical Properties of PPy/MWCNTs, PANI/MWCNTs Nanocomposites by In Situ Electropolymerization. Polymers 2021, 13, 351 .

AMA Style

Silvia Brachetti-Sibaja, Diana Palma-Ramírez, Aidé Torres-Huerta, Miguel Domínguez-Crespo, Héctor Dorantes-Rosales, Adela Rodríguez-Salazar, Esther Ramírez-Meneses. CVD Conditions for MWCNTs Production and Their Effects on the Optical and Electrical Properties of PPy/MWCNTs, PANI/MWCNTs Nanocomposites by In Situ Electropolymerization. Polymers. 2021; 13 (3):351.

Chicago/Turabian Style

Silvia Brachetti-Sibaja; Diana Palma-Ramírez; Aidé Torres-Huerta; Miguel Domínguez-Crespo; Héctor Dorantes-Rosales; Adela Rodríguez-Salazar; Esther Ramírez-Meneses. 2021. "CVD Conditions for MWCNTs Production and Their Effects on the Optical and Electrical Properties of PPy/MWCNTs, PANI/MWCNTs Nanocomposites by In Situ Electropolymerization." Polymers 13, no. 3: 351.