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* These are some of the instruments we have recently acquired in the Department of Chemistry.
   More sophisticated scientific instruments are maintained by experts and available at the Cooperative
   Center for Research Facilities on Campus.



Single-Molecule Spectroscopy Laboratory

      Pulsed Laser System

This pulsed laser system is used in spectroscopic investigation of many chemically interesting systems. Since the laser pulse generated has a less than 10 nanosecond pulse width, the laser system can also be used for the lifetime measurement of molecules with a relatively long lifetime, for example, transition metal complexes.

• Pulsed Nd : YAG laser (Spectra Physics GCR-150, 30 Hz, SHG [532 nm] and THG [355 nm])
• Tunable Pulsed Dye laser (Lumonics HD-300)



      Single-Molecule Fluorescence Microscopy Setup

This fluorescence microscopy setup is used for the single-molecule detection and single-molecule spectroscopy. The excitation light is provided with a diode pumped solid-state Nd:YAG laser operating at 532 nm. The excitation light is directed into the inverted microscope, and the microscope objective with a high numerical aperture is used to excite the sample molecules as well as to collect the resulting fluorescence. Fluorescence from single-molecules is imaged with a highly sensitive EMCCD camera.

The fluorescence images are usually collected at a fixed time interval, and the series of images are analyzed to extract information on various single-molecule properties and behaviors.

• DPSS CW Laser (CrystaLaser GCL-025-L, λ = 532 nm, 25 mW)
• Inverted Microscope (Olympus IX71, Objective UPLFLN 100x/1.30, oil-immersion)
• EMCCD (Andor iXon+ DU-897, 512×512 pixels, back-illuminated)



      Micro Raman Spectroscopy Setup

The micro Raman spectroscopy setup is most recent addition. The excitation is provided with a He-Ne laser, and the resulting Raman signal is collected with the microscope objective, filtered with an edge filter, and passed into the monochromator with a focal length of 500 mm. The monochromator, which has dual gratings, 300 grooves/mm and 1200 grooves/mm, disperses the signal, and the Raman spectra are obtained with the TE-cooled CCD detector.

• He-Ne Laser (Thorlabs HRP170, λ = 632.8 nm, 17 mW)
• Inverted Microscope (Olympus IX71, Objective UPLFLN 40x/0.75)
• Monochromator (Acton SpectraPro 2500i, f = 500 mm)
• CCD (Princeton Instruments PIXIS : 100B, 1340×100 pixels, back-illuminated)



Use
    • Identify specific molecules in sample by spectroscopic methods

Features
    • High pressure was used to generate the flow required for liquid chromatography in packed columns.
    • As various columns and detectors can distinguish different characteristics of the samples.
    • Get a results by using a computer software Unipoint.



      Glovebox

Model : Vaccum Atmosphere Company SGB-400

Purpose : reaction in inert gas(chamber filled with dry Argon gas)

Power : 110V, 60Hz

Feature : 110V, 60Hz
    • Glove box (main chamber) : Single Sided and Single Length (2 Port), 45" width X 30" deep X 36" height
      (1143 X 762 X 914 mm), stainless steel construction with removable end panels.
    • Antechamber : 15" diameter X 24" long (380 X 610mm), aluminum, mounted on right end panel. antechamber
       Manual ball valves for evacuation and refill. Stainless steel domed doors with an over center clamping handle and
       counter weighted balance for easy yet reliable operation.
    • Antechamber, Mini : 6” dia. X 12” long (152 X 305mm), stainless steel, welded to right panel. Standard feature.
    • Etc : gas purification system, glove box purge system, Vacuum pump(for purge) and cold well accessory contains.



      Tube Furnace

Model : Thermolyne 79400

Purpose : Accurate temperature control reaction

Power : 240V, 24A, 5760W, 60Hz

Feature :
    • Desc : Single zone larger size
    • Dimension : 479(D)x587(H)x886(W) mm
    • Operating Temp Range : 100~1200 ℃
    • Temp control group : 32 temp programmable.( 4group x 8 temp.)
    • Process Tube Dia : 1~3” (2.5-7.6 cm)



      potentiostat

The outline of apparatus :
This equipment is fundamental to modern electrochemical studies using three electrode systems for investigations of reaction mechanisms related to redox chemistry and other chemical phenomenon. This is one of chemistry's primary forms of instrumentation. The dimensions of the resulting data depend on the experiment. In voltammetry, electric current in amps is plotted against electric potential in voltage. In a bulk electrolysis total coulombs passed (total electric charge) is plotted against time in seconds even through the experiment measures electric current (amperes) over time.

This is done to show that the experiment is approaching an expected number of coulombs.
Most early potentiostats could function independently, providing data output through a physical data trace. Modern potentiostats are designed to interface with a personal computer and operate through a dedicated software package. The automated software allows the user to rapidly shift between experiments and experimental conditions. Just as important the computer allows data to be stored and analyzed more effectively, rapidly, and accurately than historic methods.

Specification :
    • General :
      - Automatic current range selection : 1pA to 10mA, and voltage range 0.4mV to 4V.
      - Automatic variable noise filter and potentiostat / galvanostat stability settings
      - Simultaneous acquisition of current / potential and up to 8 peripheral analog signals
      - Real time data display up to 500 pnts/s. Acquisition up to 100,000 pnts/s is stored in instrument memory.

    • Sweep methods : Linear Sweep and Cyclic Voltammetry
      - Applicable scanrates : 1µV/s to 10,000 V/s
      - Standard scanrange ± 4V, with 0.125mV step resolution.
      - High definition scanrange ± 100mV, with 3µV step resolution.

    • Pulse methods : multiple potentiostatic / galvanostatic pulses
      - Up to 255 potential or current levels may be defined
      - Minimum pulse duration 50µs, definable with 0.125µs resolution.
      - Minimum sampling interval : 10µs

    • Electrochemical Impedance Spectroscopy
      - Up to 255 frequencies may be applied during a single scan in the 10µHz to 2MHz range.
      - Result optimalisation by automated tuned filters, gain amplifiers and dc-subtraction.

    • Transient methods : Chronoamperometry&chronopotentiometry, ElectroChemical Noise
      - Up to 255 potential or current levels may be defined
      - Minimum pulse duration 50µs, definable with 0.125µs resolution.
      - Minimum interval time : 10µs
      - Mixed mode allows sequencing with definable electrical modes



      IX71

The Fluorescence Microscope :
In fluorescence microscopy, the sample you want to study is itself the light source. The technique is used to study specimens, which can be made to fluoresce. The fluorescence microscope is based on the phenomenon that certain material emits energy detectable as visible light when irradiated with the light of a specific wavelength. The sample can either be fluorescing in its natural form like chlorophyll and some minerals, or treated with fluorescing chemicals.




Organic Materials and Synthesis Lab Facilities

      Gel Permeation Chromatography

Use
    • Determination of molecular weight and molecular weight distribution of
       polymers

Features
    • Fast polymer analysis
    • Constant and stable flow rate by the isocratic solvent delivery system
       maintains the high resolution of the GPC column.
    • Refractive index detector has exceptional baseline stability with excellent
       sensitivity.
    • The GPC analysis software simplifies retrieval of the GPC data, including
       average molecular weights, Mn, Mw, Mz, Mp, Mv and polydispersity D.





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