Viviana Maria Ospina

Author response for "Mechano-catalytic conversion of polypropylene over zeolite-based materials"

Adrian H. Hergesell, Claire L. Seitzinger, Laura Seidling, Viviana Maria Ospina et autres

Homolytic fracture of inorganic crystalline materials enhances the mechano-chemical degradation of polypropylene

Adrian H. Hergesell, Raghavendra Meena, Viviana Maria Ospina, Claire L. Seitzinger et autres

Mechano-chemistry can depolymerize plastics to their monomers. The conversion of polyolefins, however, suffers from low chain cleavage rates and the low stability of radical intermediates. Therefore, insights into the degradation mechanism are crucial to obtain higher yields. Herein, we promote the mechano-chemical …

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Mechano-catalytic conversion of polypropylene over zeolite-based materials

Adrian H. Hergesell, Claire L. Seitzinger, H. Pasternak, Laura Seidling et autres

catalytic pyrolysis or mechano-chemistry. While pyrolysis catalysts are highly active but not selective, mechano-chemistry is more selective but lacks quantitative yields. To address these issues and unlock potential synergies, we herein investigate the effect of zeolite-based pyrolysis catalysts on the conversion of …

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Polystyrene Brush Evolution by Grafting to Reaction on Deglazed and Not‐Deglazed Silicon Substrates

C Ivaldi, Viviana Maria Ospina, Diego Antonioli, Giampaolo Zuccheri et autres

Abstract Two model substrates for the grafting to reaction are considered: not‐deglazed silicon, whose surface is coated by a thin oxide layer with reactive silanol groups on its surface; and deglazed silicon, where the oxide layer is removed by treatment with hydrofluoric …

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Exploiting β-amino ester chemistry to obtain methacrylate-based covalent adaptable networks

C Ivaldi, E. Laguzzi, Viviana Maria Ospina, Diego Antonioli et autres

In this study, β-amino ester-based covalent adaptable networks (CANs) were synthesised through aza-Michael addition of amines to methacrylates, with the aim of developing industrial products. Typically, CANs based on β-amino esters employ acrylate moieties, which are known to be toxic and hazardous …

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Phosphorus activation in silicon: To deglaze or not to deglaze, that is the question

Gianluca Barin, Gabriele Seguini, Riccardo Chiarcos, Viviana Maria Ospina et autres

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Brush Layers of Bioinspired Polypeptoids for Deterministic Doping of Semiconductors

Viviana Maria Ospina, Riccardo Chiarcos, Diego Antonioli, Valentina Gianotti et autres

Monodisperse polypeptoids with 5, 10, 14, and 19 monomer units and a phosphorus containing moiety at one end were prepared through the submonomer solid-phase synthetic approach. The insertion of defects at specific positions along the polymer chain enables the suppression of their …

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Quantification of molecular weight discrimination in grafting to reactions from ultrathin polymer films by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry

Riccardo Chiarcos, Diego Antonioli, Viviana Maria Ospina, Michele Laus et autres

reaction from ultrathin polymer films and, for the first time, to our knowledge, an enrichment effect occurring in the ultrathin grafted layer obtained from a melt was evidenced.

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On the way to greener furanic-aliphatic poly(ester amide)s: Enzymatic polymerization in ionic liquid

Dina Maniar, Fitrilia Silvianti, Viviana Maria Ospina, Albert J. J. Woortman et autres

The polymerization of 2,5-furandicarboxylic acid (FDCA), one of the key building blocks for the preparation of furan polymers, is often accompanied with side reactions (e.g. decarboxylation). Due to the mild reaction conditions, enzymatic polymerizations became an excellent candidate to address this issue. …

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Thermal Hyperactivation and Stabilization of β-Galactosidase from Bacillus circulans through a Silica Sol–Gel Process Mediated by Chitosan–Metal Chelates

Viviana Maria Ospina, Claudia Bernal, Mónica Mesa

The research of simple and fast enzyme immobilization methods, preserving the enzyme activity and improving the thermal stability, is in the spotlight. The objective of this work is to develop a β-galactosidase immobilization one-pot route, combining the silica sol–gel encapsulation (SSGE) process …

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HDO del guaiacol mediante el uso de catalizadores NiMo soportados sobre carbón activado obtenido a partir de la torta de higuerilla

Viviana Maria Ospina, Robison Buitrago‐Sierra, Diana López

Physical and chemical activation methods were used to prepare two different activated carbons (ACs) from castor de-oiled cake. H2O/CO2 mixture was used as the physical activating agent, and for chemical activation potassium carbonate (K2CO3) was used. For both materials, textural and chemical …

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HDO of guaiacol over NiMo catalyst supported on activated carbon derived from castor de-oiled cake

Viviana Maria Ospina, Robison Buitrago‐Sierra, Diana López

Physical and chemical activation methods were used to prepare two different activated carbons (ACs) from castor de-oiled cake. H2O/CO2 mixture was used as the physical activating agent, and for chemical activation potassium carbonate (K2CO3) was used. For both materials, textural and chemical …

co (code pays fourni par la source)