Material contrast

Describe and discuss thermoset-matrix and thermoplastic-matrix materials. Contrast their production times if you were to build a composite structure with both materials. 

Munz, M., Cappella, B., Sturm, H., Geuss, M. and Schulz, E. Materials Contrasts and Nanolithography Techniques in Scanning Force Microscopy (SFM) and their Application to Polymers and Polymer Composites. Vol. 164, pp. 87-210. 

The advantage of this approach is not only the free choice of surface stractures which can be created, the material contrast which can be realized by the combination of chemical lithography and amplification with SIP, but also the potential to bridge the gap in structural feature sizes ranging from the microscopic to the nano-scopic scale. Since the feature sizes reported are still limited to the features of the mask used, direct writing with a focused e-beam should result in patterned polymer brushes of features matching the size of the immobilized macromolecule. 

As discussed in Sect. 2.2.2, FMM images can lose the material contrast when the sample stiffness exceeds the stiffness of the cantilever. In addition, the net signal contains friction effects because of the cantilever bending and the sample indentation. Furthermore, in liquid samples, capillary forces dominate the response at low frequencies [ 127]. These drawbacks can be overcome by operating the microscope above the contact resonance frequencies. In the so-called con-tact-mode scanning local-acceleration microscope the cantilever oscillates at very low amplitudes of ca. 0.1 nm which still provides strong enough contrast with respect to the mechanical properties [122]. Since the response of the canti-... 

Tapping mode SFM shows the most versatile and strong material contrast due to variations in stiffness, viscosity and adhesion. While the theoretical basis of the tapping mode is still under development (Sect. 2.2.2), the results obtained so far can be used for qualitative discrimination between different phases in a heterogeneous sample. One should keep in mind, that the strong dependence of the contrast on the experimental parameters (CD,A,rsp) may lead to quantitative mis-... 

Visitors were also asked to report on their on-site experiences using a more open-ended format (Tables 6.9 and 6.10). This material contrasts previsit and post-visit perspectives and begins to reveal the ways in which the... 

Materials Contrasts and Nanolithography Techniques in Scanning Force Microscopy (SFM) and their Application to Polymers and Polymer Composites... 

A Partially Conductive and a Partially Semiconductive Ceramic.. 182 7.5 Materials Contrasts in the SFM Non-Contact Mode. 185... 

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