Practical applications of infrared microspectroscopy for industrial problem solving
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Practical Applications of Infrared Microspectroscopy for Industrial Problem Solving. Sample Preparation: Garbage In … You Know the Rest P.T. McKittrick, Ph.D. Nalco Company. Instruments Provide Data, Not Answers!. 90. 88. 86. 799.1. 84. 627.2. 535.6. 82. 1260.0. 1452.0.

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Practical applications of infrared microspectroscopy for industrial problem solving

Practical Applications of Infrared Microspectroscopy for Industrial Problem Solving

Sample Preparation: Garbage In

…You Know the Rest

P.T. McKittrick, Ph.D.

Nalco Company


Instruments provide data not answers
Instruments Provide Data, Not Answers!

90

88

86

799.1

84

627.2

535.6

82

1260.0

1452.0

1377.1

80

%T

1523.8

78

76

2928.8

74

1652.2

72

3329.2

70

1034.6

68

4000

3500

3000

2500

2000

1500

1000

500

Wavenumbers (cm-1)


http://www.jwst.nasa.gov/images/em_spectrum_satellite.jpg

http://upload.wikimedia.org/wikipedia/en/6/6f/IR_summary_version_2.gif


A. OH stretch B. Aromatic CH stretch

C. Methylene CH Stretch D. Overtones

E. CC ring stretch F. OH bend

G. CO stretch H. OOP CH bend


Infrared micro what
Infrared Micro-what?

  • Two names in use in the literature

    • Infrared Microscopy

    • Infrared Microspectroscopy

  • Same thing

    • Microscope with optics for the infrared coupled to an FTIR for obtaining spectra


The three functions of a microscope
The Three Functions of a Microscope

  • Focus the radiation onto the sample

  • Collect the transmitted or reflected energy and image the energy onto a detector

  • Provide the user a means of observing the sample


Ftir coupled to a light microscope
FTIR coupled to a Light Microscope

The first union of an FT-IR with a microscope.

Image courtesy of G. Shearer,

The McCrone Group


Four things to keep in mind
Four Things to Keep in Mind

  • Morphology is important. The sample is part of the optical system.

  • In general, the path length should be less than 10 microns.


Four things to keep in mind1
Four Things to Keep in Mind

  • Morphology is important. The sample is part of the optical system.

  • In general, the path length should be less than 10 microns.

  • Generally, transmission is preferable to reflection.









60

Washer Black Residue Micro

40

%T

20

0

Washer Control CH2Cl2 Micro

100

99

%R

98

97

Washer Black Residue Micro CH2Cl2

90

%R

80

Washer Black Residue Micro CH2Cl2

60

50

%R

40

4000

3000

2000

1000

Wavenumbers (cm-1)




Where did the fibers come from
Where Did The Fibers Come From?

90

Armor All Wipes

80

%T

70

60

Finished Paper Micro

80

60

%T

40

20

Finished Paper Fuorescent Fibers

80

60

%T

40

20

3500

3000

2500

2000

1500

1000

Wavenumbers (cm-1)




Four things to keep in mind2
Four Things to Keep in Mind

  • Morphology is important. The sample is part of the optical system.

  • In general, the path length should be less than 10 microns.

  • Generally, transmission is preferable to reflection.

  • Everything is inhomogeneous


Patricia L. Lang, J.E. Katon and Anthony S. Bonano, Applied Spectroscopy, Vol. 42, # 2, 313-317, 1988










The latest developments
The Latest Developments

  • First mapping, now imaging

    • Mapping – moving the sample relative to the detector

    • Imaging – Linear and focal plane array detectors

  • Chemometrics

    • Analysis of large numbers of spectra using data reduction techniques

  • Better use of optical microscopy

  • Simpler ways of doing micro-samples

  • Combined IR and Raman Instruments


Thanks to
Thanks to

  • Kate Martin and The ACCA – for inviting me to speak

  • Nalco – for allowing me to speak

  • Kirk Ashline – for allowing me to speak with him

  • All of you – for listening


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