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Definición de nanomateriales para Colombia

Revista Colombiana De Quimica, 2016
Debido a la creciente producción y uso de nanomateriales para actividades de investigación y desarrollo en Colombia, es necesario establecer una definición del término nanomaterial que facilite la toma de decisiones en torno a iniciativas de carácter ...
Nelson Obregón, Cesar A Sierra, Franklin Jaramillo   +2 more
exaly   +11 more sources

Tunable Oxygen Connectivity in Carbaporphyrinoid Polymers on Metal Surfaces. [PDF]

Angew Chem Int Ed Engl
Hydroxyl‐functionalized dicarbaporphyrinoid polymers synthesized on Au(111) enable tunable oxygen‐mediated connectivity under UHV conditions. Thermal activation yields one‐dimensional hydroxyl‐terminated polymers that can selectively evolve into either covalently‐linked dibenzo‐p‐dioxane architectures through intermolecular C–O–C coupling or two‐fold ...
Martínez-Bajo A, Urbani M, Barragán A, Jover Ó, Pérez-Elvira E, Tomei I, Goletti C, Jiménez-Martín A, Gallardo A, Lauwaet K, Écija D, Soler-Polo D, Di Giovannantonio M, Torres T, Urgel JI.   +14 more
europepmc   +3 more sources

Nanographene-Based van der Waals Organic Framework With Permanent Porosity. [PDF]

Angew Chem Int Ed Engl
Unlocking record‐breaking porosity in a supramolecular organic framework (SOF). Through the strategic design of a C3‐symmetric nanographene, a robust supramolecular framework is achieved via exclusively weak van der Waals forces. This metal‐free scaffold reaches a benchmark BET surface area of 1108 m2 g−1 –the highest to date for this class–combining ...
Oró A, Turo-Cortés R, Perles J, Costa JS, Fernández-García JM, Martín N.   +5 more
europepmc   +3 more sources

π-Enlargement in Porphyrin Macrocycles at Interfaces. [PDF]

Angew Chem Int Ed Engl
On‐surface synthesis of a 20‐π free‐base expanded porphyrin, by depositing onto a hot Ag(111) substrate an 18‐π free‐base precursor equipped with ‐CF3 functional groups ABSTRACT Porphyrins are essential heteroatomic macrocycles, fundamental to both biological systems and advanced technology.
Barragán A, Pérez-Elvira E, García-Frutos A, Vicent DJ, Mutombo P, Lauwaet K, Gallego JM, Miranda R, Urgel JI, Gallardo A, Martín N, Écija D.   +11 more
europepmc   +3 more sources

Substrate-Selective Temperature-Controlled Synthesis of Thiophene Derivatives at Interfaces. [PDF]

Angew Chem Int Ed Engl
The deposition of a dithiophene derivative on Ag(111) at room temperature followed by annealing gives rise to molecular wires, whereas the adsorption of the same precursor on a hot substrate affords the formation of benzotrithiophene species. Abstract The temperature‐controlled transformation of organic molecules at interfaces is an incipient yet ...
Pérez-Elvira E, Barragán A, Vicent DJ, Jóver Ó, Gallardo A, García-Frutos A, Černa L, Lauwaet K, Santos J, Perles J, Gallego JM, Miranda R, Urgel JI, Björk J, Di Giovannantonio M, Martín N, Écija D.   +16 more
europepmc   +3 more sources

Self-assembly and Lateral Cobalt Coordination of a Fivefold Symmetric Cyanostar Macrocycle on an Au(111) Surface. [PDF]

Chemistry
Herein, we report the first example of the formation of a close‐packed, regular 2D monolayer of a fivefold symmetric cyanostar macrocycle on an Au(111) surface under ultra‐high vacuum and the structural modification of such self‐assembled architecture upon cobalt atom deposition.
Černá L, Martínez García M, Mathialagan SK, Parreiras SO, Lauwaet K, Urgel JI, Gallardo A, Flood AH, Torres T, Gallego JM, Bottari G, Écija D.   +11 more
europepmc   +2 more sources

Simulación por computadora de nanomateriales para la conversión de energía solar* [PDF]

Mundo Nano, 2015
Resumen. Las simulaciones por computadora están desempeñando cada vez un papel más amplio en el avance de nuestra comprensión y el diseño de nuevos nanomateriales para aplicaciones fotovoltaicas.
Yosuke Kanai
doaj   +3 more sources

On-Surface Synthesis and Characterization of Cumulene-Linked Stone-Wales Polymers. [PDF]

Angew Chem Int Ed Engl
On‐surface synthesis of one‐dimensional polymers featuring Stone‐Wales defects and cumulene linkages is demonstrated via thermally and light‐induced reactions on Au(111). STM, nc‐AFM, and Raman spectroscopy, complemented by theory calculations, reveal their chemical structure with a non‐planar geometry, and a distinct electronic bandgap of 1.8 eV ...
Pérez-Elvira E, Wu F, Hwang JH, Ma J, Palomino-Ruiz L, Canola S, Barragán A, Lauwaet K, Gallego JM, Miranda R, Perrin ML, Écija D, Gallardo A, Borin Barin G, Feng X, Urgel JI.   +15 more
europepmc   +2 more sources

Stepwise On-Surface Synthesis and Transformations of Two-Dimensional Covalent Organic Frameworks by Controlled Thermal Stimuli. [PDF]

Adv Mater
The seminal transformation of a 2D‐COF (SURFCOF‐IMDEA1) into a 2D porous COF (SURFCOF‐IMDEA2) on Au(111) by a sequential C‐C coupling and ladderization triggered by thermal annealing steps at increasing temperatures is reported. Abstract The development of covalent organic frameworks (COFs) is currently a primary objective in materials science, taking ...
Barragán A, Pérez-Elvira E, Vicent DJ, Lozano M, Soler-Polo D, Lauwaet K, Gallego JM, Miranda R, Urgel JI, Jelínek P, Martín N, Écija D.   +11 more
europepmc   +2 more sources

Green Synthesis by Microwave Irradiation of TiO2 Using Cinnamomum verum and the Application in Photocatalysis

Journal of Chemistry, 2023
The extraction process of bioactives from the aqueous extract of cinnamon (Cinnamomum verum) was optimized using the Design Expert 11 program and analysis of variance (ANOVA) by considering the following parameters: cinnamon weight (g), power (W), and ...
Dante E. González-Anota, Silvia P. Paredes-Carrera, Rosa M. Pérez-Gutierrez, Brandon Arciniega-Caballero, Raul Borja-Urby, Jesús C. Sánchez-Ochoa, Elizabeth Rojas-García   +6 more
doaj   +1 more source