MX – Page 13 – TechConnect Briefs

Stability of micro and nano devices actuated by Casimir forces

Hernández J., Esquivel-Sirvent R., Instituto de Fisica, UNAM, MX

The effect of the Casimir force in micro and nano electromechanical systems (MEMS/NEMS) is examined taking fully into account the dielectric properties of the materials as well as the finite thickness of movable elements in [...]

Remote Manipulation of a Robotic Arm by Using Infrared Sensors

Chávez Rodríguez N.E., Esquivel Villar J., UNAM, MX

This project consists in adapting a remote operation system for a robotic arm by using infrared sensors to control its movements. A personal com-puter was used to send instructions to the robotic arm, instead of [...]

Morphology effect dependent on the synthesis method of KxIr1-xO2 system

Ramírez E., Chavira E., Baños L., Soto Guzmán A.B., Guzmán J., Flores C., Universidad Nacional Autonoma de Mexico, MX

We focus our attention on the synthesis of the solid solution of KxIr1-xO2 with x = 0.25. This solid solution was obtained by the solid-state reaction and sol-gel method using IrO2 and K2CO3 as starting [...]

Surface Plasmon Resonances of Metal Polyhedral Nanoparticles

González A.L., Noguez C., UNAM, MX

In this work, we show that it is possible to elucidate among different polyhedral shapes of silver nanoparticles of less than 10 nm, by studying their surface plasmon resonances. When a particle is excited by [...]

Self-assembled Film of Cholesterol Molecules on the Au (111): An STM Study

Segura A., Batina N., Univesidad Autonoma Metropolitana,Iztapalapa, MX

self-assembled film, cholesterol molecules, Au (111), STM

UV Silicon Sensor Using Si Nanocrystals

Berman-Mendoza D., Aceves-Mijares M., Berriel-Valdos L., Domínguez-Horna C., Pedraza J., Falcony C., Carranza J., INAOE, MX

After the discovery of photoluminescence of silicon (Si) nanocrystals embedded in silicon dioxide a big effort has been done to understand such emission. However, almost not application of these characteristics can be found until now. [...]

The Role of Different Parameters in the Properties of Carbon Nanotube Polymer Nanocomposites

Velasco-Santos C., Castaño V.M., CFATA-UNAM /ITQ, MX

This work presents diverse results which depend on different parameters that play an important role in the distribution, interaction and synergetic effect in composites developed with the incorporation of multiwalled nanotubes in different polymeric matrix. [...]

Hierarchical Natural Materials: Nanostructured Keratin

Martínez-Hernández A.L., Velasco-Santos C., de Icaza M., Martínez-Hernández A.L., Santiago-Valtierra A.L., Castaño V.M., CFATA-UNAM /ITQ, MX

Smart materials are required in devices in order to develop different functions referent to control and automation. The performance and applications of these materials have been growing in the last years and recently their development [...]

Self-Assembly of Tetraazamacrocyclic Compounds on Single-Walled Carbon Nanotubes: Experimental and Theoretical Studies

Basiuk E.V., Basiuk V.A., Basiuk E.V., Basiuk V.A., Rybak-Akimova E.V., Acosta-Najarro D., Puente-Lee I., Saniger J.M., Universidad Nacional Autonoma de Mexico, MX

All the existing methods of chemical modification of carbon nanotubes (CNTs) can be divided in two groups, depending on whether functionalizing moieties are introduced onto the nanotube tips or sidewalls. The latter approach offers wider [...]

The Two-Layer ONIOM Technique in the Studies of Chemical Reactions on Carbon Nanotube Tips

Basiuk E.V., Basiuk V.A., Basiuk E.V., Basiuk V.A., Universidad Nacional Autonoma de Mexico, MX

In continuation of our combined quantum mechanics/molecular mechanics (QM/MM) studies of selective amidation (reaction 1) and esterification (reaction 2) of monocarboxy-substituted tips of zigzag and armchair single-walled carbon nanotube (SWNTs), we studied theoretically the interaction [...]