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We report here the formation of polycarbodiimide-g-polystyrene copolymer secondary structures, i.e. nano-rings, “craters”, and spherical particles, resulted from dewetting phenomena that have been corroborated by combination of tapping mode AFM, SEM, DLS, and powder XRD techniques. These morphological findings represent certain interest in the area of novel functional materials. Well-defined ring-like...
Optimizing Nafion loading and surface distribution of Nafion in the fuel cell electrode is critical for the fuel cell performance for minimizing ohmic and mass transport overpotentials. An atomic force microscopy method is used here for a qualitative and a quantitative discrimination between the ionomer and Pt in the fuel cell electrode. This work describes a methodology for the analysis of complex...
We report on direct force measurements between single melt-electrospun 1,3,5-cyclohexanetrisamide (CTA) fibers in crossed-cylinder geometry. The two CTA compounds selected for this study differ in their peripheral substituents: aliphatic (-C10H21) and fluorinated chains (-CH2C6F13), respectively. Melt-electrospinning of the CTAs results in smooth and circular fibers with diameters of about 5 μm. Individual...
We measured the mechanical properties of air and oil(tetradecane)filled cross-linked lysozyme as well as water filled metal phenolate microcapsules using atomic force microscopy in the temperature range of 21–70 °C. The stiffness and modulus of the individual capsules were determined using Reissner's theory for indentation of thin elastic shells. We found that the stiffness and modulus of air filled...
This work elucidates the undisturbed interior morphology of commercial ultra-high-molecular-weight polyethylene (UHMWPE) high-performance fibers through atomic force microscopy (AFM) modulus mapping of interior surfaces exposed by a novel focused ion beam (FIB)-notched sample preparation technique. The imaging shows unequivocally the presence of epitaxial crystals in the interior of highly drawn UHMWPE...
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