MASKING AND SUBSEQUENTLY VISUALISING ESR SIGNALS USING THE COMBINATION OF TWO MATERIALS

Abstract

A body has multiple phases, which have different electron spin resonance spectra that do not result from the simple combination of the ESR spectra of each individual phase.

Claims

1. A body having multiple phases, which is accommodated by a human or animal organism or is present within the organism, the body comprising: at least two phases having a different electron spin resonance (ESR) spectrum.

2. The body according to claim 1, wherein at least one phase has purely paramagnetic centers.

3. The body according to claim 1, wherein at least one phase has at least one collectively ordering state, selected from the group consisting of ferro-, ferri-, antiferromagnetic, and a combination thereof.

4. The body according to claim 1, wherein at least one phase is ensheathed by at least one further phase.

5. The body according to claim 1, wherein the at least two phases are mixed form.

6. The body according to claim 1, wherein the body has at least three phases.

7. The body according to claim 1, wherein at least one phase includes at least one medical-technical polymer having a paramagnetic center.

8. A method, comprising: obtaining ESR spectra of the body according to claim 1, and storing the ESR spectra in a data storage unit.

9. The method according to claim 8, wherein the method is for a data management network.

10. The method according to claim 8, wherein the method is for fingerprint spectroscopy, copyright protection, and/or nutrition.

11. A method comprising: monitoring of breakdown processes in the human or anneal organism with the body according to claim 1, wherein the body has at least three phases.

12. The body according to claim 2, wherein the at least one phase has S radicals and is ultramarine.

13. The body according to claim 3, wherein the at least one collectively ordering state is selected from the group consisting of iron-oxygen compounds.

14. The body according to claim 13, wherein the at least one collectively ordering state is magnetite or a material having Fe—O phases.

15. The body according to claim 6, wherein at least one phase of the at least three phases is paramagnetic.

16. The body according to claim 15, wherein the at least one phase of the at least three phases is (phen)CuCl.sub.2.

17. The body according to claim 7, wherein the at least one medical-technical polymer has isolated radicals.

18. The method according to claim 8, further comprising: transmitting the data stored to a receiving device on receipt of a demand signal.

Description

[0042] FIG. 1a shows ESR spectra on various mixtures of MAG and UB.

[0043] At a weight-based mixing ratio of UB:MAG=30:1, the ESR signal of the S.sub.3 radical at g=2.026 is still readily apparent. It can be concluded from this that not yet all S.sub.3 radicals of the UB have entered into strong magnetic dipole interactions with MAG. But even in the case of an elevated MAG content, corresponding to a mixing ratio by weight of UB:MAG=30:3, a distinct, broad ESR signal was obtained at g=2.307 owing to the ferrimagnetic MAG particles. The signal of the S.sub.3 radicals, by contrast, was barely still apparent owing to the strong magnetic interaction between MAG and S.sub.3 radical. In the case of a proportion by weight of MAG increased to a ratio of UB:MAG=30:4, this effect was further enhanced.

[0044] The second derivative of these line forms with respect to the external magnetic field H.sub.appl employed for the spectroscopy was shown by the diagram in FIG. 1b. The twice-differentiated line forms showed the radical signal even more clearly here, especially at the UB:MAG ratio=30:4.

[0045] The influence of the magnetic interactions between MAG and UB that rises with the MAG content was perceptible in the respective peak-to-peak distance in the second-derivative line form with respect to the magnetic field.

[0046] FIG. 2 shows ESR spectra that were obtained on thin layers of UB and MAG on adhesive strips.

[0047] As expected, the ESR signals of the layers comprising MAG and comprising UB corresponded to the ESR signals of the pure MAG and UB components.

[0048] If, however, an intimate bond was provided by the sticking of the adhesive strips onto one another, different ESR signals were obtained.

[0049] The intensity of the ESR signal caused by the S.sub.3 radical was found to be attenuated, whereas the ESR signal of the MAG barely lost any intensity but had undergone a slight shift from a value of g=2.766 to g=2.897.

[0050] It is assumed that this effect was attributable to the magnetic dipole interaction between MAG and UB, which probably means that even the mechanical contacting of the thin layers onto the adhesive strip simultaneously affected the ESR signal of the S.sub.3 radical and the ferromagnetic ESR signal.

[0051] The ESR spectra lust demonstrated show that, in mixtures of UB and MAG, a proportion of MAG of even about 10% by weight is sufficient to suppress the ESR signal of the radical below the detection limit. Even the contacting of thin layers containing both components attenuated this signal to about half the value.

[0052] If, by contrast, exclusively a paramagnetic component was mixed with UB, the S.sub.3 radical ESR signal was obtained in virtually unchanged form, even when the proportion of the paramagnetic component was much higher than that of MAG.

[0053] Without being tied to a particular theory, the inventors suspect the cause of the shift in the ESR signal in FIG. 2 to lie in the magnetic state of the particles that causes self-demagnetization. The resulting internal field H.sub.int can be approximated by a simple relationship:

H.sub.int=H.sub.appl−N M,

where M is the magnetization, N is the demagnetization factor and H.sub.appl is the external magnetic field employed for the spectroscopy. The demagnetization depends on the geometry of the M-comprising particles or substance and the global form of the body that consists of such particles or substance. In the form of a layer, for example, that led to the spectrum in FIG. 2, a much stronger demagnetizing field is found when the outer magnetic field is applied perpendicularly to the layer surface than is brought about by spherical or cubic particles or bodies. N here can be assumed to be close to 1.

[0054] In the case of spherical or cubic particles or bodies that in particular are not in a layer arrangement, N can be set at ≈⅓. It is also suspected that the demagnetizing field causes the shift in the ESR spectra as a result of a change in magnetostatic interaction when the layers containing magnetite and ultramarine are stacked one on top of another than the abovementioned dipole interactions in the case that magnetite and ultramarine are mixed together.

EXAMPLE 2

Body Comprising phen(CuCl.SUB.2.) and Ultramarine Blue

[0055] As Example 1, except that the mixture, rather than with MAG, was provided with paramagnetic dichloro(1,10-phenanthroline)Cu.sup.II (phen(CuCl.sub.2)) complex and ultramarine blue in a weight ratio of 1:1.

[0056] While a considerable attenuation effect was observed in Example 1 because of the strong magnetic interaction between MAG and the S.sub.3− radical anion of ultramarine blue, this interaction was absent between the paramagnetic component with Cu.sup.II ions (d.sup.9, spin=½), namely the phen(CuCl.sub.2) complex.

[0057] The ESR spectrum of the paramagnetic phen(CuCl.sub.2) complex showed the typical signals of Cu.sup.II at g=2.246 and g=2.061, shown in FIG. 3, line shape b). The mixture with UB gave the ESR spectrum as a superimposition of Cu.sup.II and the S.sub.3.sup.− radical (FIG. 3, line shape c)). Line shape c) obviously corresponded in a very good approximation to the direct sum total of line shapes a) and b); see FIG. 3, line shape a)+b). This demonstrates a vanishing magnetic interaction between Cu.sup.II and S.sub.3.sup.− of ultramarine blue.

EXAMPLE 3

Inventive Body as Tablet Suspended in Water

[0058] A mixture of 10 mg of Fe.sub.3O.sub.4, 10 mg of ultramarine blue and 130 mg of methyl cellulose was pressed to a tablet by subjecting the mixture to a pressure of 10 bar for 2 min. The tablet thus obtained was comminuted and suspended in water in a beaker. For the ESR measurements, samples of the suspension were introduced into a glass capillary after different times. Different ESR spectra were obtained as a function of time, which are shown in FIG. 6, specifically with line shape (a) the as yet unsuspended tablet and with line shape (b) the signal of the tablet after advanced suspension.

[0059] The apparent total intensity of the ESR signal demonstrates the altered content of suspended solids with time. The inventive monitoring of breakdown processes is thus also possible for simple dissolution of the body according to the invention. Line shape (c) in FIG. 6 shows the magnetite-free ESR signal for comparison.

Comparative Example

ESR Measurements on Pure Magnetite or Ultramarine

[0060] ESR spectra were recorded in the band at different temperatures on one solid sample each of magnetite, trade name “Cathey Pure Black B2310 (4096)”, and one sample of ultramarine, trade name “Kremer Pigment (45000)”.

[0061] Pure magnetite showed the typical broad asymmetric singlet for ferromagnetic behaviour, the line shape of which changed reversibly with rising temperature, shown in FIG. 4. Such behaviour is probably attributable to the superimposition of ferromagnetic domains of different structure and/or orientation.

[0062] The ESR spectrum of ultramarine contained a narrow isotropic signal that was attributable to the S.sub.3 radical; see FIG. 5. Typical temperature behaviour was observed for purely paramagnetic centres, i.e. the intensity rose with falling temperature.