Other properties and techniques
Other properties and techniques
Other properties and techniques
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This is a service recognized by UNIZAR ( http://sai.unizar.es/otros-sct-universidad-zaragoza ), in which there are rheometers for viscosity measurement in fluids and suspensions. The following services are performed:

A. Obtaining of fluidity curves at room temperature or at other temperatures between 5-70º.
B. Study of time-dependent rheological properties (e.g. viscosity, elastic modulus or loss modulus… as a function of time).
C. Study of temperature-dependent rheological properties (example: viscosity curves, elastic modulus or loss modulus,… as a function of temperature) between 5 C and 70 C.
D. Determination of viscoelastic properties (elastic modulus, loss modulus, loss tangent, …) of substances by means of oscillatory tests at different frequencies.
E. Other tests related to the rheological properties of viscoelastic substances.

Contact person: Mario Mora (mmora@unizar.es)

More information: SAI

GRIMM Aerosols particle classification system that allows the characterization of particulate matter in the aerosol phase in the nanometer range (10-1100 nm) capable of measuring up to a maximum concentration of 150,000 particles/cm3. It is a portable system, which gives it versatility and the possibility of carrying out measurement campaigns in different laboratories. It has a sampling flow rate of 0.3 L/min and a response time of less than 3 seconds. The equipment is composed of:
– SMPS+C Scanning Mobility Particle Sizer and Counter capability: 5416-SET
– Annular Dielectric Barrier Discharge (ADBD) Neutralizer: model 5520

Applications

SUSTAINABLE NANOTECHNOLOGY AND NANOSAFETY
– Development of systems for the generation and control of nanoparticulate aerosols.
– Control of nanomaterial emissions in different occupational scenarios.
– Establishment of safety procedures and recommendations for the safe processing of nanomaterials.
– Evaluation of the filtering capacity of materials against aerosols composed of micro- and nanoparticulate material.
– Control of environments with low concentration of environmental particles, such as clean rooms and other similar environments.

NANOMEDICINE – CONTROLLED DELIVERY OF DRUGS
– Development of innovative devices that enable the delivery of drugs and biomolecules via the respiratory route.

 Contact person: Pilar Lobera (plobera@unizar.es)

Complete solar device characterization equipment consisting of ABB solar simulator, IPCE (incident photon to current efficiency) equipment, electrochemical impedance spectroscopy (EIS), reference silicon cell and electronic measurement equipment and management software. It allows the characterization of small photovoltaic devices of DSSC type (dye cells), organic cells, perovskite cells and silicon cells.

 Contact person: Santiago Franco (sfranco@unizar.es)

Gas physisorption, usually N2 at a temperature of 77K is used to determine the textural properties of porous solids (zeolites, MOFs, silica, carbons…). The adsorption isotherm can be used to calculate the specific surface area BET (m2/g), pore volume and pore size distribution. The CREG and NFP groups have two devices available, TRISTAR for measuring the specific surface area of porous materials and pore distribution in the mesoporous range with a resolution of 0.05 mmHg and ASAP 2020 which can measure the micropore range with a resolution of 0.000001 mmHg. It is possible to use other gases in addition to N2, Ar and CO2.

Contact person: Reyes Mallada (rmallada@unizar.es)

Characterization of optical waveguides/waveguide losses (Model 2010/M prism coupler for characterization of waveguides)

This equipment allows the determination of the thickness and refractive indices (at different wavelengths) of optical waveguides, as well as the analysis of losses in the guided light.

It is based on a light coupling mechanism using a prism, which is brought into contact with the guide surface by a pneumatic cylinder. Prisms of different refractive index (np) can be chosen, depending on the characteristics of the guides to be studied. Pressure regulation also allows adaptation to different types of materials. Lasers of different wavelengths can be used, with 408, 633, 780, 1306 nm currently available.

The system records the reflected light when varying the angle of incidence, for which the assembly (waveguide + prism) is arranged on a rotating platform. It is measured with TE and TM polarization light and, from the analysis of the patterns in the reflected light, the software provides the index for TE and TM modes as well as the thickness of the guide.

This equipment is essential for the characterization of thin films with optical anisotropy or guides that exhibit an index gradation in depth, to name two applications. It is also possible to measure the index of bulk materials.

On the other hand, the measurement of flat guide losses is based on the focusing of a scanning fiber, which samples the light scattered from the guide surface and carried to the photodetector. This option allows losses ranging from 20 db/cm to 0.1 db/cm to be measured.

Contact person: Belén Villacampa (bvillaca@unizar.es)

Figure 1. Configuration of the refractive index measurement system and thickness of the guides. The prism on which a 633 nm beam is incident can be seen. The assembly rotates with respect to the beam, which remains fixed..
Figure 2. Guided modes for an anisotropic polymer film deposited on a glass substrate. The pattern of the modes (“wells” in the reflected light record) obtained by varying the angle of incidence of the laser beam on the prism is shown.

Metrohm Micro-AutoLAB II.
It is a compact computer-controlled potentiostat/galvanostat for electrochemical research and analysis controlled with powerful software that allows the user to perform a wide variety of electrochemical techniques as well as data analysis.

The software package offers a wide range of electrochemical techniques:
Cyclic voltammetry
Normal pulse voltammetry
Differential pulse voltammetry
Square wave voltammetry
Chronoamperometry/Coulometry/Potentiometry
AC Voltammetry
Pulsed amperometric detection
Linear sweep voltammetry.

Contact person: infraestructurasinma@unizar.es

The thermal imaging camera measures the temperature distribution on non-contact surfaces. The intensity of the IR signal on the surface is a function of the temperature and emissivity of the solid. In the NFP group there are two IR cameras, one of which is directly coupled to a microwave heating system. The InfraTec, GmbH camera measures in the range 0 to 500 °C and the Optris PI 1 M camera operates in the range 450 °C to 1800 °C and is capable of measuring through a curing window since it works with a spectral range between 0.92-1.1 µm which does not interfere with the transmission window of quartz.

Persona de contacto: Nuria Navascués (nurian@unizar.es)

 

The DLS technique “Dynamic Light Scattering” is used to measure particle size in a colloidal suspension. The light scattered by the particles is collected in a photodetector as a function of time and from this information a correlation function is established from which the information corresponding to the particle size is extracted. In addition, this same equipment is used to measure the surface charge of the particles, Z potential.

There are two equipments in the laboratories of INMA researchers, Malvern Zetasizer Nano and Brookhaven 90 Plus. Measuring range from 2 nm to several microns depending on the particles and provided they form a stable colloid solution.

Contact person: infraestructurasinma@unizar.es

This technique provides a particle size distribution in a colloidal solution by nanoparticle tracking (NTA). The particles are visualized through a microscope and during the measurement a video is made in which the movement of the particles is observed. Subsequently, powerful image analysis software is used to analyze the speed of movement of each particle, which is related to Brownian motion and is a function of particle size. With this technique it is possible to measure particles with a size between 10 and 200 nm. The technique requires careful sample preparation and optimization of the particle concentration during the measurement. It also provides information on the concentration of nanoparticles in the sample.

Contact person: Paco Balas (fbalas@unizar.es)

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