1) Prof. Miguel José Yacamán
The University of Texas at San Antonio, USA.
Department of Physics and Astronomy
Title: Modern Electron Microscopy a Nanolab rather than an Electron Optical Instrument
At the beginning of this century the spectacular advances on electromagnetic lens design produced conquer the spherical aberration and push the image resolution to picometers. That advance has had a spectacular advance on materials science. However, as a side effect of Cs correction it was possible to increase the pole gap size and high resolution with large space available became possible. As a result it is possible now to introduce on the specimen holder a large number of devices. Now it is possible to measure electrical, optical, mechanical and magnetic properties at different temperatures and conditions. In that sense the TEM has become a Nano laboratory. In this talk we will show some examples of research “In operando” in different nanomaterials including Nano plasmonic materials, nanoparticles and radiation sensitive samples.
2)Prof. Marek W. Urban
Clemson University, USA
Department of Materials Science and Engineering
Department of Chemistry
Title: Self-Healable Polymer Chemistry
Materials with build-in active components are excellent candidates for the development of new technologies. Manifested by the ability to respond to stimuli, these components not only extend materials’ lifetime, but also minimize environmental footprint. Among particularly impressive properties of stimuli-responsive materials that recently received significant attention are materials with the ability to self-repair. Recent studies have utilized a variety of non-covalent and covalent chemistries that resulted in the development of self-healing polymers and this lecture will outline recent advances in self-healing of polymers covalent incorporation of chemically modified poly and monosaccharides into crosslinked as well as free radical stability. If properly designed, self-repairing can be achieved in the presence of atmospheric carbon dioxide and water. Unlike plants, these networks require no photo-initiated reactions, thus are capable of repairs in darkness under atmospheric conditions and lead to the formation of carbonate and urethane linkages. The last part of will outline how commodity acrylic-based copolymers are able to self-heal upon mechanical damage. This behavior occurs when the monomer molar ratios are within a certain range, forming reversible ‘key-and-lock’ interactions with preferentially alternating copolymer topologies. The unique self-healing behavior is attributed to favorable inter-chain van der Waals (vdW) forces manifested by the increased cohesive energy densities (CED) forming ‘key-and-lock’ inter-chain junctions, enabling multiple recovery upon mechanical damage without external intervention. The concept of redesigning commodity copolymers without elaborate chemical modifications containing favorable vdW interactions may inspire many new technological opportunities for reinventing existing and the development of new generations of copolymers with controlled chain topologies that exhibit repetitive damage-repair cycles.
3) Prof. Ignacio Rivero Espejel
Instituto Tecnológico de Tijuana, México
Centro de Graduados e Investigación
Título: Química Combinatorial y Química en Fase Sólida. Estrategias para la Nanotecnología.
Los orígenes de la química combinatoria se describen por primera vez en la síntesis orgánica en fase sólida. Este fue un desarrollo que le dio el premio nobel a Merrifield y que consistía en el uso de una resina de poliestireno que se emplea en forma de pequeñas esferas y es insoluble en casi todos los solventes. La síntesis en soportes sólidos permite que las reacciones sean cuantitativas en cada etapa y requiere procesos simples como lavado y filtración. El éxito de la síntesis en la fase sólida depende de la elección de la resina, del soporte y de la estrategia del grupo protector. Las primeras aplicaciones de polímeros como grupos protectores en síntesis orgánica han estado relacionados con la síntesis consecutiva de moléculas grandes tales como oligosacáridos, oligonucleótidos y polipéptidos. Existen varios métodos que se han aplicado en la síntesis de macromoléculas, pero son muy laboriosos y casi en todas las etapas es necesario aislar y purificar el producto. Se ha establecido que de cada 10,000 compuestos que se sintetizan, solo uno tiene la posibilidad de ser considerado como factible, para que un medicamento pueda salir al mercado. El desarrollo de la síntesis múltiple y simultánea (Química Combinatoria) ha permitido la elaboración de las bibliotecas combinatoriales sintéticas. La química combinatoria se aplica en la actualidad a la variedad de métodos, procedimientos o estrategias que permiten generar productos de manera simultánea, rápida y eficiente. La aplicación de la química combinatoria y la preparación de bibliotecas es factible implementarlas en cualquier otro tipo de soporte, como es el caso de nanomateriales: nanotubos de carbono, nanopartículas metálicas, nanoestrellas, nanorods, etc.
¿Cuál es futuro de la química combinatoria?
Un gran impacto ha tenido en la actualidad el constante desarrollo de la química combinatoria como metodología de búsqueda de nuevos materiales. La síntesis orgánica en fase sólida aunada a técnicas combinatorias es una alternativa viable para la preparación de bibliotecas químicas. Con la diversidad de soportes nanométricos y la adaptación de nuevas técnicas es factible sintetizar nanobibliotecas químicas con potenciales aplicaciones.
En esta conferencia se mostrarán algunos ejemplos de sistemas basados en química combinatorial y en síntesis en fase sólida como plataformas para la preparación de bibliotecas químicas, el desarrollo de compuestos con actividad biológica y nuevos nanomateriales como sensores selectivos o transportadores de fármacos.
4) Prof. Olivia Graeve
University of California, San Diego, USA
Department of Mechanical and Aerospace Engineering
Title: Design of Novel Corrosion Resistant Materials: an Emerging Technology for Extreme Environments
This talk will present an overview of the design and manufacturing of ultra-high hardness and corrosion resistant Fe-based metallic glasses (known as SAM7 and SAM2´5), with potential applications in a variety of demanding corrosion environments. We have developed two types of in situ composites using a dynamic loading strategy and have characterized the density, phase development, and microstructure. We have also developed and characterized ex situ composites by adding various crystalline powders to the amorphous metal powders and present possible effects of particle size, volume fraction, and type of crystalline phase (tungsten or tantalum) on the design strategy. From this, we propose a devitrification processing map that facilitates designing in situ and ex situ bulk metallic glass composites. In situ composites (formed by devitrification) or ex situ composites (formed by addition of a reinforcement phase) can facilitate improvement in toughness of these materials. We expect this general approach will be applicable to other bulk metallic glass composites, and especially beneficial for marginal glass formers that are otherwise difficult to process. Particular emphasis will be placed on the results of the mechanical properties of the ex situ composites of SAM2´5-tungsten obtained by microindentation and nanoindentation. In addition, the materials achieve record elastic limits greater than 11 GPa, indicating an outstanding impact resistance. Finally, the observed corrosion resistance of the materials was found to be comparable to that of high-performance nickel-based alloys and superior to that of stainless steels, which may enable applications of importance in industries such as oil and gas production, refining, nuclear power generation, shipping, etc.
5) Prof. Patrick Walsh
Professor of Chemistry
University of Pennsylvania, USA.
Conference: New reactions and Applications to Polymerization Process
The seminar will outline the Walsh Group’s efforts in C–C and C–S bond forming reactions. The Walsh lab has developed a series of Pd and Ni catalyzed deprotonative cross-coupling processes (DCCP) that enable the synthesis of a variety of small molecule building blocks for use in the pharmaceutical industry. The second part of the seminar will outline the introduction of a novel class of organocatalysts, sulfenate anions, that facilitate the dehydrocoupling of benzylic halides (below) and the formation of alkynes. The dehydrocoupling of benzylic chloromethyl groups to form polymers will also be introduced.
6) Prof. Corinna Schindler
Department of Chemistry
The University of Michigan, USA
Conference: Iron (III)-Catalyzed Carbonyl-Olefin Metathesis and Oxygen Atom Transfer
The metathesis reaction between two unsaturated organic substrates is one of organic chemistry’s most powerful carbon-carbon bond forming reactions. The catalytic olefin-olefin metathesis reaction has led to profound developments in the synthesis of molecules relevant to the petroleum, materials and pharmaceutical industries. These reactions are characterized by their use of discrete metal alkylidene catalysts that operate by a well-established reaction mechanism. While the corresponding carbonyl-olefin metathesis reaction similarly enables the direct construction of carbon-carbon bonds, currently available methods are scarce and hampered by either harsh reaction conditions or the requirement of stoichiometric transition metal complexes as reagents. We have recently developed the first catalytic carbonyl-olefin ring-closing metathesis reaction that utilizes iron as an earth-abundant and environmentally benign transition metal.,  Our reaction design accommodates a variety of substrates and is distinguished by its operational simplicity, mild reaction conditions, high functional group tolerance, and amenability to gram scale synthesis.
 Ludwig, J.R.; Zimmerman, P.M.; Gianino, J.B.; Schindler, C.S. Iron(III)-catalyzed carbonyl olefin metathesis. Nature 2016, 533, 374-379.
 McAtee, C.C.; Riehl, P.S.; Schindler, C.S. Polycyclic Aromatic Hydrocarbons via Iron(III)- Catalyzed Carbonyl-Olefin Metathesis. J. Am. Chem. Soc. 2017, 139, 2960.
 Ludwig, J.R.; Phan, S.; McAtee, C.C.; Zimmerman, P.M.; Devery, J., III; Schindler, C.S. Mechanistic Investigations of the Iron(III)-Catalyzed Carbonyl-Olefin Metathesis Reaction. J. Am. Chem. Soc. 2017, 139, 10832-10842.
7) Prof. Diane K. Smith and Hyejeong Choi
San Diego State University, USA
Department of Chemistry and Biochemistry
Title: Using Electron-Transfer-Induced Proton Transfer to Ratchet Up Binding Strength in H-Bond Dimers
An important goal in supramolecular chemistry is the development of stimuli-responsive systems in which the strength of the intermolecular interactions can be altered by external signals such as changes in light, temperature, pH or voltage of an electrode. Our group is exploring the latter possibility, primarily by trying to develop systems in which electron transfer perturbs the strength of H-bonding interactions between molecules. The underlying principle is straightforward: an oxidation that decreases the negative charge on a H-acceptor (A) or a reduction that decreases the positive charge on a H-donor (D) will weaken a H-bond. Alternatively, reduction that increases the negative charge on a H-acceptor or oxidation that increases the positive charge on a H-donor will increase the strength of a H-bond. However, in the latter case, it is possible that oxidation or reduction could also lead to full proton transfer. If this occurs across the H-bond, the primary H-bonds will remain, but the secondary H-bonds will change. This can lead to an increase in unfavorable secondary interactions, which would counteract the effect of the initial proton transfer. However, with proper design, proton transfer could lead to an increase in favorable secondary interactions, which would enhance the effect of initial transfer. The goal of this project is to do the latter. For this work, the 3 H-bond DAD array, 1, that contains a N-methyl-4,4′-bipyridinium or “monoquat” redox couple (see figure) has been synthesized. Compound 1 forms a three H-bond dimer with the non-electroactive ADA array, 2, in CH2Cl2. Typically, DAD-ADA arrays such as this have relatively weak association constants of ~102 M−1 in non-competitive solvents such as CH2Cl2 due to the three, favorable primary H-bonds (shown as solid, double-headed, green arrows in the figure) being counterbalanced by four unfavorable secondary interactions (shown as dashed, double-headed, red arrows). In this case 1H NMR titration gives a Kb of 650 M−1 under electrochemical conditions (0.1 M NBu4PF6/CD2Cl2). This is relatively strong for these types of complexes, probably due to the greater acidity of the amide NH’s in 1 because of the strongly electron-withdrawing nature of the pyridinium. In the absence of 2, initial cyclic voltammetry studies of 1 display the expected two, sequential, 1 e− reduction waves of the monoquat redox couple in CH2Cl2, corresponding to reduction of 1 to the radical and then the quinoidal anion. Addition of 2 results in no change in the E1/2 of the first reduction, but the second reduction shifts 0.30 V positive. Further addition of 2 causes no additional change in the E1/2, consistent with a 1:1 complex. The 0.30 V positive shift indicates an ~105 increase in binding strength upon overall 2 e− reduction of 1. Combined with the initial association constant of 650 M−1, this indicates an association constant of ~108 M−1 in the fully reduced state. We believe the most likely explanation of such strong H-bonding in a 3 H-bond array is that the second reduction induces proton transfer across the central H-bond in the complex, thus converting the DAD-ADA array to a DDD-AAA array. The latter is expected to have significantly stronger H-bonding because all of the secondary interactions, in addition to the primary interactions, are favorable.
8) Prof. Jesús J. Pérez Torrente and M. Victoria Jiménez
Universidad de Zaragoza, España
Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea
Title: Catalyst Design Based on NHC Ligands for Sustainable Chemistry and Energy
The modulation of catalyst properties through the ancillary ligands is crucial in the field of homogeneous catalysis. N-heterocyclic carbene ligands (NHC) have shown a great versatility due to the possibility of fine-tuning of their steric and electronic properties which has allowed for the design of highly thermally stable transition-metal based homogeneous catalysts. In this context, the chelate or pincer effects derived from coordination of multidentate NHC ligands results in the formation of stable metal-ligand platforms with application in catalysis.1 On the other hand, functionalized NHC ligands of hemilabile character can play a dual role in a catalyst since they can easily enable coordinative sites at the metal center and, at the same time, protect the coordination sites by a dynamic “on and off” chelating effect.
This presentation will focus on the synthesis of transition metal complexes containing NHC-based heteroditopic ligands of hemilabile character and carboxylate-functionalized bis-NHC ligands. Selected examples on the catalytic applications of this type of complexes in diverse areas of sustainable and energy chemistry will be presented. In particular, the borrowing hydrogen methodology that allows using alcohols as alkylating agents for C-C and C-N bond forming reactions offering significant environmental benefits over traditional approaches.2 On the other hand, the development of active and robust water-oxidation catalysts is crucial for the design of artificial photosynthetic devices. In this context, water soluble zwitterionic complexes are effective water oxidation catalysts driven by sacrificial oxidants. Mechanistic studies have shown that the stabilization of high-valent iridium species is responsible for the catalytic activity in water oxidation.
 R. Puerta-Oteo, M. V. Jiménez, F. J. Lahoz, F. J. Modrego, V. Passarelli, J. J. Pérez-Torrente, Inorg. Chem. 2018, 57, 5526–5543.
 a) M. V. Jiménez, J. Fernández-Tornos, M. González-Lainez, B. Sánchez-Page, F. Javier Modrego, L. A. Oro, J. J. Pérez-Torrente. Catal. Sci. Technol. 2018, 8, 2381–2393. b) M. V. Jiménez, J. Fernández-Tornos, F. J. Modrego, J. J. Pérez-Torrente, L. A. Oro. Chem. Eur. J. 2015, 21, 17877-17889.
9) Prof. Eduardo Vivaldo Lima, Porfirio López-Domínguez and Julio C. Hernández-Ortiz
Universidad Autónoma de México, México
Facultad de Química
Laboratory for Chemical Technology (LCT), Ghent University, Belgium
Title: Modeling of Polymer Network Formation by RAFT Copolymerization of Vinyl/Divinyl Monomers in Supercritical Carbon Dioxide
A kinetic model for the reversible addition-fragmentation chain transfer (RAFT) radical copolymerization of vinyl/divinyl monomers in supercritical carbon dioxide (scCO2), using a multifunctional approach for polymer network formation, is presented. The process is assumed to proceed as a dispersion polymerization in three stages, with two phases: CO2- and polymer-rich phases. A simple model for partition of the main components within the two phases is used. Experimental data of monomer conversion, molar mass development, evolution of gel fraction and swelling of the polymer network for a styrene/divinylbenzene system, at 80 °C and 300 bar, are used to validate the model. Good agreement between model predictions and experimental data was obtained.
This presentation will be mainly based on the following paper recently published:
Porfirio López-Domínguez, Julio César Hernández-Ortiz, and Eduardo Vivaldo-Lima, Macromol. Theory Simul., 27(1), 1700064, 1-14, 2018, DOI: 10.1002/mats.201700064.