This laboratory occupies 880 sq. ft and is located in the Chemical Engineering Building of the University of Puerto Rico at Mayagüez. It is outfitted with five chemical hoods, a 6’ MBraun Unilab glove box, gas lines (nitrogen, air, vacuum), basic organic and inorganic synthesis equipment, Nanopure DI water purifier, MBraun Unilab 2000 glove box, analytical balance, preparative centrifuge, rotary evaporator, vacuum oven, an S.G. Frantz L1-CN magnetic canister separator (High-Gradient Magnetic Separator), a Brookhaven Instruments BI-90Plus dynamic light scattering instrument with PALS zeta potential measurement capability and autotitrator, a Varian Scimitar FT-IR spectrometer with diamond and ZnSe ATR, a Gel Permeation Chromatography setup consisting of a Waters pump system and a Brookhaven Instruments Multi-Angle Laser Light Scattering (MALLS) detector, and a TA Instruments Q2000 Differential Scanning Calorimeter.
This laboratory occupies 277 sq ft and is located in the Chemical Engineering Building of the University of Puerto Rico at Mayagüez. It has one specimen preparation table, one chemical hood, He and N2 gas tanks, liquid N2 and Helium Dewars, analytical balance, three programmable Brookfield DV-III+ rheometers, six Fluke 45 multimeters, two Fluke 195-U dual signal arbitrary waveform generators, one Tektronix TDS1002 digital oscilloscope, one AE Techron power supply amplifier, one GMW Electromagnets current-limited high-voltage power supply, various magnetic field sources including 3-phase 2-pole induction stators (uniform rotating field) and 6-inch ID coil capable of generating 0.14T fields, one Sypris 7030 three-channel gaussmeter with three-axis, transverse, and axial probes, one Signal Processing DOP2000 Ultrasonic Doppler Velocimeter with 10 channel multiplexer and (5) 4MHz non-magnetic ultrasound probes, an Anton Paar MCR 301 rheometer with magnetorheological device, and one Quantum Design MPMS XL-7 Superconducting Quantum Interference Device magnetometer.
Linux HPC cluster with one head and nine compute nodes (each node consists of dual processor, dual core Intel Woodcrest processors (2.6 GHz), 4GB RAM, and 80 GB HD). The cluster is protected by full battery backup. We are in the process of installing another 40 processor cluster on loan from the University of Wisconsin, Madison.
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Quantum Design MPMS XL-7 SQUID Magnetometer – this instrument, acquired through NSF CTS-0320534, is an extremely sensitive (~10-8 emu) magnetometer capable of measuring sample magnetization up to 300 emu with controllable temperature range from 1.9 – 400 K. This fully programmable instrument is equipped with an AC susceptometer (±5 Oe applied field amplitude and 0.01 – 1,500 Hz applied field frequency range) and a manual insertion utility probe useful for electronic transport studies (i.e. resistivity, I-V curves, critical current, etc.). |
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Brookhaven Instruments BI-90 Plus Dynamic Light Scattering (DLS) unit with PALS Zeta Potential Analyzer – this is fixed-angle DLS instrument with integrated zeta-potential measurement capacity. Hydrodynamic radii as small as 4 nm can be determined, depending on sample preparation and scattering properties of the colloidal particles (our particles are solid ferrites, and hence very strong scatterers). Determination of the hydrodynamic radii using DLS is important to our research as it allows verification of theoretical expressions for rheological parameters of dilute magnetic nanoparticle suspensions. Furthermore, this instrument can measure zeta potential in aqueous solutions with high ionic content and in organic solvents, making it suitable for studying colloidal stability of both water-based and oil-based magnetic fluids. |
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Anton Paar MCR-301 with Magnetorheological Device - add description. |
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Signal Processing S.A. DOP 2000 Ultrasonic Doppler Velocimeter – this instrument measures the Doppler frequency shift of an ultrasonic beam emitted from a non-magnetic probe to determine the velocity (along the beam path) of tracer particles immersed in a fluid medium. Because this is a non-magnetic/non-optic technique it is especially suited for measuring velocity profiles in opaque magnetic fluids. The instrument is equipped with a 10-channel internal multiplexer suitable for measuring multiple ultrasonic beams sequentially. We currently have three 4MHz probes which are suitable for the velocity and penetration ranges of interest in our research. |
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GPC |
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Glove box |
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DSC |
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FTIR |
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HPC Cluster |
