The high-resolution X-ray diffractometer provided with SmartLab Guidance software, acts as an intelligent interface for the user. The system incorporates a high resolution θ/θ closed loop goniometer drive system, cross beam optics (CBO), an in-plane scattering arm, and an optional 3.0 kW rotating anode generator. High flexibility by coupling a computer controlled alignment system with a fully automated optical system makes it easy to switch between hardware modes. Optional in-plane diffraction arm for in-plane measurements without reconfiguration and focusing and parallel beam geometries without reconfiguration.
Centre for Fuel Cell Technology (CFCT)
Dr. N. Rajalakshmi
Trace GC Ultra; Thermo Fisher Scientific, USA
Facility is integrated with a methanator for detection and evaluation of trace amounts of CO and CO2 gases present in the reactant/ product stream of gases
Gas chromatograph with TCD, FID and FPD detectors is used to analyse the exhaust gas from the fuel cell especially, when the fuel cell is operated with methanol and reformate gas.
Centre for Fuel Cell Technology (CFCT)
Dr. N. Rajalakshmi
BROOKFIELD RHEOMETERS DV-III™ Ultra Programmable Rheometer
This Rheometer easily predict a material's flow, spray, or pumping behavior by studying shear rate profiles and has continuous display of: Viscosity (cP or mPa·s), Temperature (°C or °F), Shear Rate, Shear Stress, % Torque, Spindle, Program status 2600 speeds for incredible characterization possibilities It has easy-to-use keypad with numeric keys for stand-alone program entry.
Centre for Fuel Cell Technology (CFCT)
Dr. N. Rajalakshmi
Medium size chamber variable pressure SEM with Quad Bias gun electronics which improves low voltage performance and increases beam the current. Dual high-take-off ports accommodate two EDS detectors mounted 180 degrees apart to tice the analytical data collection plus eliminate X-ray map shadows associated with rough sample surfaces. A high speed, clean, efficient TMP eliminates the need for water cooling. Advantages of being compact, high performance and user friendly. For quick observation of non-conductive samples the SU1510 utilizes variable pressure mode that eliminates negative charging, and provides the optimum conditions for both imaging and Energy Dispersive X-ray microanalysis. The specimen chamber and stage have been designed to accommodate samples as large as 153 mm in diameter. Simultaneous EDX microanalysis and imaging can be completed on a sample that is up to 60mm in height at the analytical working distance of 15 mm.
Centre for Materials Characterization and Testing (CMCT)
Dr. N. Rajalakshmi
STA 4497,QMS403C; NETZSCH, Germany
It consists of a vacuum-tight thermo micro balance system, microprocessor-controlled, with integrated calibration weight, with water-cooled heater, exchangeable sample carrier including radiation shield, programmable gas flow for 3 gases and integrated heating power supply, automated lid lifting device (prepared autovac for automated vacuum generation/ventilation). This instrument comes with QMS coupling for evolved gas analysis from 1-300 amu and a processing module of the Aeolos software (as of version 7.02), enabling a triggered start and stop as well as the transfer of the temperature signal into the Aeolos software for programming and control. unit for data acquisition and processor of max. 64 measuring channels (mass and mass range resp.)
Centre for Fuel Cell Technology (CFCT)
Dr. N. Rajalakshmi
High resolution Field Emission Gun scanning electron microscope (FEG-SEM), (Model: Merlin Compact, Make: Zeiss, Germany) is available at ARCI, Chennai. The instrument has a best resolution of 0.8 nm with accelerating voltage variable from 0.02 to 30 keV. The FEG source is of thermionic emission type. The SEM is equipped with Secondary electron detector, In-lens detector, Back scattered Electron detector and EDS detector (EDAX, USA) for compositional analysis. The sample stage is a 5 axis euccentric stage with a tilt angle ranging from -3 to 70 0. The Gemini I column enables high resolution and high probe current making it more suitable for analytical applications.
Centre for Automotive Energy Materials (CAEM)
Dr. D Prabhu
Park XE7 (Direct On-Axis Manual Focus Optics)
The atomic force microscope (AFM) is extensively used in material science and biological sciences. Characterization of sol-gel thin film surface morphology in sub-micron scale is necessary to evaluate their function properties in a wide variety of applications. It has been known that sub-micron and nanoscale properties control various aspects of functional performance. For example, enhanced transmittance in borosilicate glass (BSG, 91%) over soda lime glass (SLG, 89%) is due to sub-nanometer surface morphology of BSG. This may occur due to its different chemical composition though the refractive indices are comparable.
Centre for Sol-Gel Coatings (CSOL)
Dr. K. Murugan
CS - 444, LECO, USA
Carbon/Sulphur system is a microprocessor based software driven instrument for wide range measurement of Carbon and Sulphur content of metals, ores, ceramics and other inorganic materials. It uses HF-400 induction furnace (18 MHz, 2,2 kW) for CO2/SO2 conversion. It works on the principle of infrared absorption of CO2 and SO2.
Centre for Nanomaterials (CNM)
Dr. Malobika Karanjai
CCX 2000, Atlas Material Testing Solutions, USA
To better understand the potential for adverse effects of outdoor exposure, materials are regularly tested to various environmental conditions. The cyclic corrosion cabinet is now accepted as superior at duplicating actual environments. It improves repeatability, reduces time spent in handling samples and also operator error by creating different environments in one cabinet. Standard exposure cycles like salt or chemical fog, water fog, salt spray, dry-off cycle, high temperatures i.e. up to 70oC can be increased for required time from hours to number of days which are closer to environmental changes.
Salient features-Materials of different sizes and shapes can be tested under various environmental conditions by using various standard methods like ASTM B117, ASTM G85 A5, CCT I, CCT IV, SAE J2334 and GM9540B.
SI 1287 ELECTROCHEMICAL INTERFACE
SI 1260 FREQUENCY RESPONSE ANALYSER
SOLARTRON ANALYTICAL (UK)
The electrochemical testing system consists of two units. Electrochemical interface and impedance/gain-phase analyzer along with softwares corroware and Z plot
SI1287-Solartron, U.K
The corrosion is an electrochemical process and electrochemical potential is the driving force for reactions. The principle employed in the electrochemical interface is based on the application of a controlled voltage to a sample (working electrode) and measurement of the change in current, or vice versa. The corrosion rates of the specimens can be determined using CorrWare programme. Most of the corrosion types uniform, localized, galvanic, dealloying; stress corrosion and hydrogen-induced failure can be analyzed by this technique. Conventional electrochemical experiments like static, dynamic polarization, potentiostatic, potentiodynamic experiments etc. can be done. This system is extensively used to study the corrosion properties of coated substrates. Based on the results, further improvement of coatings has been done. Different types of coatings like DLC on Al alloys, MAO coatings on Al, Coating on steels and Al alloys by Sol-Gel technique, materials like Mg-Zn, steels, alloys have been analyzed. The system can also be used to study batteries, fuel cells, inhibitors, electroplating and catalytic properties etc.
SI1260-Solartron, U.K
Frequency range 10 �Hz to 32 MHz with 10 �Hz resolution.
Electrochemical Impedance Spectroscopy is a powerful technique, which can provide lot of information on corrosion reactions, mass and charge transport, the characteristics of material and coating in different electrolytes. An electrode interface undergoing an electrochemical reaction is typically analogous to an electronic circuit consisting of a specific combination of resistors and capacitors. This is used to characterize the electrochemical system in terms of its equivalent circuit. The system is widely used in characterization of materials, batteries, and coatings and to illustrate their corrosion mechanism. It is also used for investigating mechanisms in electrodeposition, electrodissolution, passivity and corrosion studies.
Centre for Material Characterization and Testing (CMCT)
Ms. A. Jyothirmayi
This system is equipped with an electron beam and a focused ion beam (FIB). The Ga-ion beam is used to remove material from the sample surface in a controlled fashion and the electron beam is used to carry out the imaging. As the FIB unit is present in-situ in the FE-SEM, live imaging is possible. Applications include study of coating growth mechanisms, corrosion etc. The system can also be used to prepare samples for EBSD, where a mirror finish and relatively strain-free surface is necessary. There are several ports available for additional equipment to be installed such as a nanomanipulator that can be used as a TEM sample preparation tool, a nanolithography system that can be used for preparation of samples for microtensile testing and so on. If an EBSD unit is attached to the dual beam microscope, the three-dimensional extent of grains in the sample can be mapped out.
Centre for Materials Characterization and Testing (CMCT)
Dr. L. Venkatesh
Content will be posted soon
Centre for Solar Energy Materials (CSEM)
Dr. S. Sakthivel
Horiba Jobin Yvon; Labram Micro Raman Spectrometer
Raman Spectrometery is complementary to FTIR. Raman can be used to analyse aqueous solutions since it does not suffer from the large water absorption effects found with FT techniques. Raman requires little or no sample preparation. Raman Spectroscopy actually originates from the bond vibrations. This intrinsic nano probing combined with micro raman spectroscopy makes it very sensitive to short range structure in the nano materials. Thus it is good complement to TEM or X-Ray Diffraction techniques. The advantage of No sample preparation required both for solid and liquid samples in Micro Raman Spectroscopy makes it an easy access to characterize nano materials. Micro Raman provides phase identification, even traces of secondary phase can be detected as the polarisibility changes for different kinds of bonds which is detected in the Raman intensity.
Centre for Nanomaterials (CNM)
Dr. B.V. Sarada
With the aid of computer control, arrays of indents can be made on the sample and the hardness can be measured as a function of distance from a reference point. This unit is especially suitable to induce cracks on the sample surface so that the fracture toughness can be measured.
Centre for Materials Characterization and Testing (CMCT)
Dr. L. Venkatesh
Nano SZ, Malvern Instruments Limited, UK
The instrument measures the diffusion coefficient (D) and converts this to particle size, using the Stokes-Einstein equation: D=kT/3S, D=Hydrodynamic diameter, T=Absolute temperature, D=Diffusion Coefficient, K=Boltzman's constant, =Viscosity/c
Centre for Ceramic Processing (CCP)
Dr. B. Suresh
The system is used for estimating surface roughness and other surface parameters, as also to create 3D profiles of surfaces. It uses white light interferometry to map specimen surfaces. A beam splitter is used to split the incoming beam into two. One part goes to a reference mirror that is optically smooth while the other part scans the sample surface. The interference pattern between the two beams (that is, the one coming from the reference mirror and the other from the sample) is used to recreate the surface profile. The resolution of the unit is 0.1 nm and hence optically smooth surfaces can be studied. An advantage of this system over an atomic force microscope is that there is no mechanical contact with any part of the sample and hence even smooth and soft surfaces can be profiled. Another advantage is that the optics stay much above the sample and hence even deeper areas of the sample surface can be imaged as far as the light beam is able to fall on the area of interest.
Centre for Materials Characterization and Testing (CMCT)
Dr. L. Venkatesh
MS3000, Malvern Instruments Ltd., UK
Measures particle size distribution and size
Centre for Ceramic Processing (CCP)
Dr. B . Suresh
Content will be posted soon
Centre for Materials Characterization and Testing (CMCT)
Dr. L. Venkatesh
This instrument is used for studying sample surfaces at high magnifications (> 200000x) due to the presence of a hot Schottky field emission (FE) gun. Potential (called the extraction voltage) is applied to draw out the electrons. Due to this combination of high temperature and extraction voltage, the brilliance of the source beam, as also its stability, is high. This system is attached with an EDS unit and an electron back scatter diffraction (EBSD) unit.
One of the interactions that occur when an incident electron beam falls on a sample is the production of x-rays from the sample. The x-ray frequency is characteristic of the element in the sample that produces it. Thus, several elements can be analysed simultaneously. The detector analyses the energies of the generated x-rays, leading to speedy detection of the elements.
In the EBSD unit, the sample is kept inclined at an angle of 70 to the incident beam and the emergent backscattered electrons undergo diffraction. The diffracted beams are collected on a phosphor screen where they form bands that are indexed based on known crystallographic inputs. The electron beam moves on the sample surface in a regular manner based on a step size determined by the user. Electron diffraction occurs at each point and the entire area of interest on the sample surface is mapped. EBSD is a technique where the input is crystallographic information and the output is microstructural information. The orientation of individual grains can be measured using EBSD, as also the grain shape, size and boundary statistics. EBSD is also a powerful tool for the determination of crystallographic texture. A special feature of the unit at ARCI is that the EDS and EBSD units work in synchronisation and hence elemental and microstructual information can be collected from each point from the area of interest. A recent area of application is phase analysis using the EDS/EBSD combination. Since spatial information from the different grains is preserved in EBSD, the location of small amounts of secondary phases (at triple points or within grains) can be determined accurately.
Centre for Materials Characterization and Testing (CMCT)
Dr. L. Venkatesh
STA 449 Jupiter - Netzsch GmbH, Germany
Measures TGA/DTA and DSC simultaneously from room temperature to 1400 C.
In STA, the sample is subjected to a controlled temperature programme of heating where the change in mass, the absolute sample temperature and the difference in temperature of sample with a reference are measured simultaneously and monitored very accurately. With a proper calibration the heat flux to and from the sample can be calculated which in turn helps in determining the specific heat as a function of temperature. The specific heat of a material is an important thermodynamic parameter which helps to study and understand the mechanism of phase transitions etc.
Centre for Carbon Materials (CCM)
Dr. P.K. Jain
ASAP 2020
Surface area and porosity are two important physical properties of the nanopowders that can be measured by this method. The equipment works on gas absorption principle therefore, it is very effective tool to study the surface morphology of the materials. Surface area (as low as 0.05m2/g) can be measured. It can measure adsorption and desorption isotherms to determine the shape of pores. It is possible to carryout measurements using adsorbates such as N2, Ar, CO2 and Kr selectively and also capable of measuring Langmuir surface area and pore size distribution. Volume, area, total pore volume and pore size in the range 0.35 to 500nm can be determined.
Centre for Nanomaterials (CNM)
Dr. Neha Yeshwanta Hebalkar
F20, Filmetrics Inc., USA
The thin film analyzer works based on the intensity measurement of reflecting and transmitting light through the sample. Hence, thickness of only transparent coatings can be measured, though the substrates can be of transparent or non-transparent nature. There are possibilities of using a contact or a non-contact probe depending upon the nature of film and the substrate.
Centre for Sol-Gel Coatings (CSOL)
Dr. R. Subasri
This instrument is used for studying samples at very high magnifications (> 500000X) in transmission. Samples of 3mm diameter are prepared such that the thickness at the centre is 200 nm or less so that electron transparency can be achieved. The incident electron beam can be accelerated to 200 kV and on passing through the sample, several interactions take place. The transmitted beam is then used for imaging and also electron diffraction studies. The system is equipped with an LaB6 filament providing a high beam current and long filament life. The unit has EDS and Electron Energy Loss Spectroscopy attachments, both of which are techniques for elemental analysis. In the later technique, the energy lost by the incident beam on passing through the sample is measured and thus elemental information can be obtained.
Centre for Materials Characterization and Testing (CMCT)
Mr. M. Ramakrishna
Small-angle X-ray scattering (SAXS) ,Xenocs, France
A laboratory small-angle X-ray scattering (SAXS) system with a dual energy (Mo and Cr) source has been designed with the aim of studying the heterogeneity in high-Z metallic structural materials such as steels (Fe alloy) and other materials. With the combination of Mo and Cr energies, various camera lengths (maximum of 2400 mm), and an area detector, three decades of q range has been achieved, from 0.024 to 14 nm-1. In real space, the probing periodic distance is a maximum of 261 nm. In addition to having Mo and Cr sources, a flexible sample mounting stage permits measurements on a wide range of materials in transmission geometry. More details about instrument can be found at “A multi-functional dual-energy laboratory Mo-Cr-SAXS system” J. Appl. Cryst. (2015). 48, 2040-2043 https://doi.org/10.1107/S1600576715018804 http://scripts.iucr.org/cgi-bin/paper?S1600576715018804
Centre for Materials Characterization and Testing (CMCT)
Dr. K. Suresh
Omicron Nano Technology, UK
The instrument has the capabilities of depth profiling by Ar ion etching, Imaging XPS, Auger photoelectron spectroscopy (static and scanning modes), Scanning Electron Microscopy (SEM), Sample heating (upto 100oC) and cooling (liq N2 temp.). The technique being surface sensitive, it is very useful to characterize nanomaterials including, powders and thin films.
Centre for Nanomaterials (CNM)
Dr. Neha Yeshwanta Hebalkar
RAPID-II-D/MAX MICROFOCUS X-ray Diffraction System (RIGAKU Corp., Japan)
Rigaku-MICROMAX 007 HF rotating anode (Cu and Cr target); 2D-curved image plate detector (size: 470 x 256mm); collimators: 10, 30, 50, 100, 300 and 800 mm diameter; 2theta range: -47 to +163 degree
This is the most versatile laboratory scale x-ray diffraction system. It is equipped with high intensity microfocus rotating anode x-ray source-Rigaku MicroMax 007HF, which has brightness close to a second generation synchrotron with x-ray flux of 1014 to 1015 x-ray photon/mm2/s at the focal point. The system also has a highly sensitive and large image plate based 2-dimensional (2D) detector, which ensures a full scan from -47 to +163 degree for 2theta in a single exposure of very small duration. It has both Cu and Cr target option with provision to bring the beam spot size down to 10 micron. The system can be operated in reflection, transmission and glancing incidence configuration. It can perform wide range of studies like phase analysis, texture, residual stress, trace phase detection (for phase fraction of 0.1% or less) in micro/macro-area apart from thin film analysis in the glancing incidence mode. In addition, it has a provision to perform fully automated area mapping using auto stage.
Centre for Nanomaterials (CNM)
Dr. Joydip Joardar