Central Environmental Science and Engineering Laboratory

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Key Facilities

We are equipped with state-of-the-art instrumentation to support various research and development. A summary instrumentation available is listed below:

Welcome to the On-line Booking for instrument usage or contact our staff at 67904851.

For Staff/Student: Click Here

Charges for the use of key equipment: Click Here

If you encountered problems booking on-line, please call 67904851 to make booking.

For instruments like GC, HPLC & ICPMS that required more preparation to suit to researchers requirement please contact staff at 67904851 for discussions before booking.


Atomic Force Microscope (AFM)

AFM is an extremely precise microscope that images a sample by rapidly moving a probe with a nanometer-sized tip across its surface. It provides a number of advantages over conventional microscopy techniques. AFM can make measurements in three dimensions, x, y, and z (normal to the sample surface), thus enabling the presentation of three-dimensional images of a sample surface.

AFMs require neither a vacuum environment nor any special sample preparation, and they can be used in either an ambient or liquid environment. The AFM system can be operated in contact mode and non-contact mode.


Field Emission Scanning Electron Microscope (FE-SEM)

The thermal FE-SEM (JSM-7600F) successfully combines ultrahigh resolution imaging with optimized analytical functionality. It is equipped with low-angle backscattered electron detector, LN2 Free EDS detector and scanning transmission electron detector (STEM)..

Features

  • Ultrahigh resolution comparable to the cold cathode FE-SEM. SEI resolution of 1.5 nm (1kV) in GB mode and 1.0 nm (15 kV)
  • Magnification of 25 to 1,000,000x
  • Accelerating voltage of 0.1 to 30 kV
  • Aperture angle control lens automatically optimizes the spot size at both high and low currents for both analysis and imaging.
  • Built-in r-filter enabling user selectable mixture of secondary electron and backscattered electron images.
  • Gentle Beam mode for top-surface imaging, reduced beam damage and charge suppression. Beam current of 1 pA to 200 nA at 15 kV.

Inductively Coupled Plasma Mass Spectrometer (ICP MS)

ICP-MS is an analytical technique used for elemental determinations at trace level. It offers better sensitivity than other elemental analysis techniques such as atomic absorption and optical emission spectrometry, including ICP Atomic Emission Spectroscopy (ICP-AES).

It also has the capabilities to perform quantification of elemental isotopic concentration and ratios, as well as precise speciation capabilities when used in conjunction with HPLC.


High Performance Liquid Chromatography (HPLC)

HPLC is used frequently in biochemistry and analytical chemistry to separate, identify, and quantify compounds based on their idiosyncratic polarities and interactions with the column's stationary phase. UV/Vis detector and fluorescence detector are available for different application.


Gas Chromatography Mass Spectrometer (GCMS)

GCMS is an analytical method that combines the features of gas-chromatography and mass spectrometry to identify different substances within a test sample. The applications of GCMS include air pollutant analysis, environmental analysis and unknown sample identification.

The GCMS (Agilent 7890B/5977A) has a highly sensitive Extractor Ion Source for higher Signal-to-Noise (SNR) and low-femtogram Instrument Detection Limit (IDL). The system comprised of ChemStation Data Analysis software as well as the highly productive MassHunter Quantitative and Qualitative Analysis software in a single workstation. In addition, the system also comes with the MassWorks software that allowed the analysis to achieve high mass & spectral accuracy for identifying unknown compound with high-confidence with or without a compound library.

Besides the liquid sampling, this GCMS system also allows sampling of gas and slurry samples. Air or gas samples can be collected into a sorbent packed tube and introduced into the GCMS via Thermal Desorber (Markes TD-100). Headspace and thermal sorption probe (TSP) sampling are the other alternative methods which available on this system.



Gas Chromatography System (GC)

GC is used in analytic chemistry for separating and analyzing compounds that can be vaporized without decomposition.The GC- FID can detect almost all carbon containing compounds.


Ion Chromatography (IC) for anions

Ion Chromatography is a process that allows the separation of ions and polar molecules based on their affinity to the ion ex-changer. The ion chromatography in CESEL is commonly used in water analysis for anions. The preconfigured Dionex ICS-1000 integrated system performs isocratic ion chromatography (IC) separations using conductivity detection. The default settings allow the detection of anions such as F-, Br-, Cl-, NO2-, NO3-, PO43-, SO42-. By selecting a suitable column, one can detect more types of anions.


Total Organic Carbon Analyzer (TOC)

TOC provides a speedy and convenient way of determining the degree of organic contamination in water. It measures the amount of carbon-containing compounds present in a liquid sample, an indicator of the organic character of the stream.

It can handle extremely wide range of sample concentration from 4µg/L to 25,000 mg/L for applications in ultrapure water and highly contaminated water, respectively.


UV-Vis Spectrophotometer

UV-Vis spectrometer is a double beam scanning spectrometer for measurements on liquids, solids, pastes and powder samples. The wavelength ranges from 190nm to 1100nm with fixed 1.0 nm slit. Scattered transmittance and diffuse reflectance measurement with wavelength range 250-1100nm is available.


Fluorescent Spectrometer

The fluorescence spectrometer is a complete workstation for a very wide variety of sensitive biochemical studies, including fluorescence, phosphorescence, and bio-chemiluminescence. The monochromators working range are 200-800nm (excitation) and 200-650nm (emission). The wavelength accuracy is plus or minus 1.0nm.


Epifluoresence Microscope

Fluorescence microscopy is based upon the concept that there are certain materials that emit energy which can be detected as a visible light. Each of these materials must be irradiated with a different specific light wavelength in order to cause an energy reaction in the form of light. The sample being used can either be treated with some fluorescing substances or it can be fluorescencing on its original form.

The fluorescence in the specimen gives rise to emitted light which is focused to the detector by the same objective that is used for the excitation. Since most of the excitatory light is transmitted through the specimen, only reflected excitatory light reaches the objective together with the emitted light and this method therefore gives an improved signal to noise ratio.


X-ray diffraction (XRD)

The system provides complete X-ray radiation protection according to the German federal regulations. Bright warning lamps for "X-ray on" and "Service operation". High visibility and accessibility of the goniometer through two folding doors with four large lead-glass windows.

Under operational conditions the two folding doors are locked actively by the safety circuit. The XRD is for examining the physio-chemical make-up of unknown solids. It is used to quantity both the chemical and mineral compositions of materials, such as industrial hazardous waste as well as treated products. It has the ability to perform a full range of applications, from qualitative and quantitative phase identification to crystal structure solution of powder samples, crystallite size determination, micro strain analysis, residual stress analysis, and preferred orientation.


Video Contact Angle (VCA)

Video Contact Angle is simple and compact tools that be used for the following applications:

  • Evaluate surface cleanliness and cleaning methods
  • Study adhesion, wetting behavior, surface treatments and coatings
  • Absorption Studies

The VCA (AST-Optima) has the features of Dynamic capture capability, Motorized syringe, Surface energy analysis and Pendant drop analysis. The VCA Optima utilizes a precision camera and advanced PC technology to capture static or dynamic images of the droplet and determine tangent lines for the basis of contact angle measurement. A manual or automatic syringe provides easy dispensing of test liquid. Computerized operation eliminates human error in line drawing and captures dynamic images for time sensitive analysis. Data and images are stored in the computer for later analysis or easy transfer to other software applications.


Critical Point Dryer (CPD)

As the substance in a liquid body crosses the boundary from liquid to gas (drying via heating), the liquid changes into gas at a finite rate, while the amount of liquid decreases. When this happens within a heterogeneous environment, surface tension in the liquid body pulls against any solid structures the liquid might be in contact with. Delicate structures such as cell walls, the dendrites in silica gel, and the tiny machinery of microelectromechanical devices, tend to be broken apart by this surface tension as the drying via heating occurs. In freeze-drying, some structures can be disrupted even by the solid–gas boundary.

Supercritical drying, on the other hand, changes liquid to gas yet does not cross any phase boundary, instead passing through the supercritical region, where the distinction between gas and liquid ceases to apply. Densities of the liquid phase and vapor phase become equal at critical point of drying.Hence critical point drying is a better method of dehydrating biological tissue prior to examination in the Scanning Electron Microscope because the cell walls or other delicate structures are better preserved.

The K850 combines versatility and ease of operation. Built-in thermo-electric heating and adiabatic cooling allow precise temperature control. The vertical pressure chamber (32mm diameter x 47mm) has a side viewing port, which allows a clear view of the liquid meniscus during filling.




Other support equipment

  • Walk-in cold room
  • Furnace
  • Fume hood

Other facilities

  • Briefing room with visual aid
  • Training room with visual aid

 

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