Postdoctoral Research Position in Theoretical Active Matter and Systems

A postdoctoral position is available at the Institute for Functional Nanomaterials (http://ifn.upr.edu) at the University of Puerto Rico – Mayagüez (UPRM) to work in the area of active matter and colloidal hydrodynamics. The postdoctoral scholar will study, at a fundamental level, self-propulsion of colloidal particles. The postdoc will join a new, dynamic group exploring modeling…

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All undergraduate researchers from Córdova-Figueroa Group admitted to 2014 REU summer programs

Congratulations to Luis Nieves, Eddie Ramos, Wilfredo Méndez, Alexa González, and Carlos Pérez for being adminited to REU programs for this summer. They will work in areas related to polymer physics, biofluids, autonomous motion of catalytic particles, Brownian dynamics, and molecular dynamics.   Luis Nieves – MURF at California Institute of Technology (advisor: John F.…

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Non-spherical osmotic motor: chemical sailing (JFM)

Sergey Shklyaeva1a2a3, John F. Bradya2 c1 and Ubaldo M. Córdova-Figueroaa1 a1 Department of Chemical Engineering, University of Puerto Rico – Mayagüez, Mayagüez, PR 00681, USA a2 Divisions of Chemistry & Chemical Engineering and Engineering & Applied Science, California Institute of Technology, Pasadena, CA 91125, USA a3 Institute of Continuous Media Mechanics, Ural Branch of the Russian Academy of Sciences, Perm,…

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Self-powered enzyme micropumps (Nature Chemistry)

Samudra Sengupta, Debabrata Patra, Isamar Ortiz-Rivera, Arjun Agrawal, Sergey Shklyaev, Krishna K. Dey, Ubaldo Córdova-Figueroa, Thomas E. Mallouk & Ayusman Sen Published online: 30 March 2014 | doi:10.1038/nchem.1895   Self-powered micropumps that are turned on by the presence of their respective substrates are formed from surface-immobilized, ATP-independent enzymes. Coupling substrate-sensing with transport enables the design of devices that deliver…

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Nanodays 2013 – Mayagüez Mall

Every year since 2008, NSF has carried out a nationwide festival of educational programs focusing on nanoscale science known as “NanoDays”, and 2013 was no exception. The event took place on April 14th, 2013 at the Mayagüez Mall in Mayagüez, Puerto Rico, where the local community, especially K-12 students, witnessed several activities and experiments/demonstrations on…

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Workshop to local teachers

On May 26th, 2012, Dr. Córdova-Figueroa and his research group participated in a workshop for local math and science teachers also coordinated in collaboration with SONW and NSF Wisconsin-Puerto Rico PREM. The event took place in Hotel Villa Antonio, Rincón, PR and it was the third time offered in the last few years. Its main…

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NanoDays in Mayagüez Mall

NSF-sponsored outreach activity “Nanodays” was carried out on April 14th, 2012 in Mayagüez Mall at Mayagüez, Puerto Rico. The main objective of this event was to show to the local community, especially K-12 students, some important features of nanotechnology. Several research groups from the University of Puerto Rico at Mayagüez of different backgrounds presented simple and…

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Workshop: Viscous Flows & Brownian Motion

Last Saturday, we participated in a workshop for local science and math teachers sponsored by Science on Wheels and NSF. Our goal was to explain in very simple terms the physics of viscous flows and Brownian motion. Teachers will then use this information to prepare classes on these subjects. Attached is a video of the…

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Brownian Dynamics Simulations (BDS)

Brownian dynamics simulations also known as BDS, is a computer-based simulation technique were a pre-design system is allowed to respond to any given configuration (in this case to an applied external forces/torque) to study the interaction inside the system. These interactions allowed the system to respond instantaneously to the given configuration, which causes the system…

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Dynamic Light Scattering(DLS) diffusivity calculations

Dynamic light scattering, also known as quasi elastic light scattering (Quels) and photon correlation spectroscopy (PCS), measures the laser light that is scattered from dissolved macromolecules or suspended particles. Due to the Brownian motion of the molecules and particles in solution fluctuations of the scattering intensity can be observed. According to the semiclassical light scattering…

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Nanotechnology for use in water treatment

About one billion people in the world don’t have access to clean water  since most of the water sources are contaminated. As world population increases, so does industrialization and urbanization. These socioeconomic developments generate an escalating demand for water, which causes all kinds of environmental and social dilemmas such as contamination of water resources with…

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Janus particles and cancer treatment

A Janus particle is composed of two fused parts, two-faced, like the Roman god Janus of doorways who is usually depicted with his faces looking in opposite directions. These asymmetric particles have two distinctly different sides, i.e. each face made from a different surface chemistry, or substance, than the other one. This janus particle, named…

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Video Particle Tracking (VPT)

Today, one of the must powerful tools to the study of a object movement behavior is the “Video Tracking”. In general, video tracking is the process of locating a moving object or multiple objects in a specific boundary over time using a camera. In other words,  it associate target object in consecutive videos frames. Exist…

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Biofilters

Also known as biological filters are devices that remove a wide range of polluting compounds from a stream of fluid (air or water) through a biological process. How do Biofilters work? The air is drawn near the center of emanation and usually led to a conditioning chamber.  In the chamber the air is saturated with moisture and then guided to a fixed bed of biomass.  The pollutants are absorbed to the biofilm of biomass formed over the fill and subsequently are digested by microorganisms.  In our research group of bacteria motility we are…

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More About E. Faecalis: The Main Character Of Our Research Project

Enterococcus faecalis (before 1984, E. faecalis was known asStreptococcus faecalis) is a gram-positive commensal bacteria that inhabits the gastrointestinal tract of humans and other mamals.  Like other species of the genusEnterococcus, E. faecalis can cause risky  infections in humans, especially in hospital setting.  The presence of Enterococci is enhanced because he had the ability to acquire resistance…

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Chemotaxis of Cancer Cells in the Process of Metastasis

Cell motility plays an important role in many biological processes, like cancer metastasis. Of particular importance in these processes is chemotaxis: directed motility towards increasing concentrations of soluble factors. Cancer metastasis is a complex process that involves a number of events, with multiple signals from tumor and stromal cells, the extracellular matrix, and soluble growth…

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Phoretic mechanisms for particle motion

Colloids have been a very useful model for description of particle interactions.  With their different shapes and sizes scientists have been able to study phase behavior of particles of those shapes.  Some have been studied by their magnetic dipole moment to study spin interactions.  Some have been studied for their autonomous motion simply caused by…

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Tips on how to write a scientific research paper

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The importance of bacteria and their movement

Scientists face a lot of challenges every day.  According to their interests, they investigate new treatments to cure diseases, bioremediation schemes, answer unsolved mysteries, among others.  Bacteria play an important role in the answer to these challenges.  Not only in the biological field but also in engineering, these unicellular organisms have been fundamental.  In recent…

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Gold Nanoshells and Cancer Treatment

Cancer represents a major concern not only in the medicine area, but in all the science sectors around the globe. Now, nanotechnology is leading the area of research development thanks to some new discoveries that allow the scientific community to see the light at the end of the tunnel. In previous research, the creation of…

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Titanium Dioxide for Photocatalytic Decontamination

Water decontamination using titanium dioxide (TiO2) as photocatalyst is being used in some places around the world. Under ultraviolet light (UV) the TiO2 reacts with organic pollutants due to it strong oxidative potential. It is also demonstrated that with natural sunlight the TiO2 can degrade the 4-chlorophenol pollutant from water[1]. Also other water contaminant can…

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Nanotechnology: Janus Particles

Recently, the synthesis of Janus particles has created great interest in the scientific field. These particles received its name in allusion to the double-faced Roman god Janus; for this reason the particles with two chemically or physically different surfaces, receive the name of Janus particles. Synthesized particles with different properties present new opportunities for many…

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A Revolutionary Medical Application: Nanomedicine

During time pass new diseases are discovered. At the same time the researches and scientific community are looking forward for innovates treatments, medicine and solutions. The nanotechnology field has been increasing fast to collaborate significantly in medicine. What is nanotechnology? And how can collaborate with medicine? According to National Nanotechnology Initiative, nanotechnology is the engineering…

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Advantages of Nanotechnology for Humanity

Nanotechnology is a field of the applied sciences dedicated to the control and handle of matter at a scale smaller than a micrometer. Nanotechnology does not only allow us to develop smaller electronic devices, nanotech promises innovative and efficient solutions for environmental problems and other problems that affect mankind. The solutions include new medical applications,…

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Machines at very small scales

What is a machine? And why do we need them? The scientific definition of a “machine” is any device that transmits or modifies energy. In common usage, the meaning is restricted to devices that have rigid moving parts that perform, or assist in performing some work (see Concise Oxford Dictionary), although animals, including humans, and…

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