Can intrinsic viscosity be negative




















Mikosch , Th. Rotational diffusion in polyacrylamide gels as a function of solvent quality. The Journal of Chemical Physics , 12 , Pair your accounts. Your Mendeley pairing has expired. Please reconnect. This website uses cookies to improve your user experience. By continuing to use the site, you are accepting our use of cookies. Read the ACS privacy policy. That said, I am now wondering of the possibility of this effect happening in reverse but not being noticed.

How could you determine this? First steps first: to the literature. As is often stated, 6 months in the lab will save you an afternoon in the library. New method for estimating the parameters of the wormlike chain model from the intrinsic viscosity of stiff-chain polymers.

Google Scholar. Hydrodynamic and mass spectrometry analysis of nearly-intact human fibrinogen, chicken fibrinogen, and of a substantially monodisperse human fibrinogen fragment X. Arch Biochem Biophys. Harding SE. The intrinsic viscosity of biological macromolecules. Progress in measurement, interpretation and application to structure in dilute solution. Prog Biophys Mol Biol. Studies of the denaturation and partial renaturation of ovalbumin. Biochem J. Huggins ML. The viscosity of dilute solutions of long-chain molecules.

Dependence on concentration. J Am Chem Soc. Kraemer EO. Molecular weights of celluloses and cellulose derivatives. Indus Eng Chem. The surprise came around when they overfed these tiny bacteria with additional nutrients, and as a result, their rheometer started to measure not only a fluid viscosity of zero, but also negative values of viscosity. With the additional nutrients, the bacteria started propelling the fluid beyond the imposed shear!

These results suggest that the bacterial motion can be used to drive micro-mechanical devices such as microfluidic pumps.

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