How do hydrogen bonds affect viscosity

This molecule is a peptide analog which forms a transient linear H-bond network. Individual H-bond lifetimes and dynamical fluctuations were observed on the timescale of 1.

This identifies a mechanism which may aid in understanding the emergence of various complex phenomena arising from transient molecular structures, with implications ranging from the internal dynamics of proteins, to the glass transition, to better understanding the origins of the unique properties of H-bonding liquids.

Perticaroli, B. Mostofian, G. Ehlers, J. Neuefeind, S. Diallo, C. Stanley, L. Daemen, T. Egami, J. Katsaras, X. Cheng and J. Nickels, Phys. Fuel oil, lubricating grease, and other long-chain alkane molecules are quite viscous for this reason. The video below shows several different long chained oils, each progressively more viscous. The viscosity of a liquid always decreases as temperature increases.

As the molecules acquire more energy, they can escape from their mutual traction more readily. The Journal of Physical Chemistry Letters , 9 12 , A Quantum Chemical Study. The Journal of Physical Chemistry A , 18 , Journal of the American Chemical Society , 36 , The Journal of Physical Chemistry B , 29 , Paschoal , Luiz F.

Faria , and Mauro C. Vibrational Spectroscopy of Ionic Liquids. Chemical Reviews , 10 , Izgorodina , Zoe L. Seeger , David L. Scarborough , and Samuel Y. Multiscale Studies on Ionic Liquids. The Journal of Physical Chemistry A , 5 , Keaveney , Tamar L. Greaves , Danielle F. Kennedy , and Jason B. The Journal of Physical Chemistry B , 49 , Kowsari and Leila Tohidifar. The Journal of Physical Chemistry B , 41 , Fillion , Han Xia , M.

The Journal of Physical Chemistry A , 31 , The Journal of Physical Chemistry B , 16 , Bielawski , and Koen Binnemans.

Ionic Liquid Crystals: Versatile Materials. Chemical Reviews , 8 , Pereiro , Natalia V. Plechkova , Luis P. Rebelo , Kenneth R. The Journal of Physical Chemistry B , 9 , Quitevis , Rajesh Khare , and Edward J. The Journal of Physical Chemistry B , 47 , Hatcher , Sharon Ramati , and James F. The Journal of Physical Chemistry B , 46 , Faria and Mauro C.

The Journal of Physical Chemistry B , 44 , Kurur , and Siddharth Pandey. The Journal of Physical Chemistry B , 42 , Rodrigues , Marisa A. Rocha , Hugo F. Almeida , Catarina M. Lopes-da-Silva , Mara G. The Journal of Physical Chemistry B , 28 , On the other hand, when both alcohols and alkanes increase in chain length, they tend to become more viscous and syrupy.

This intermolecular force can be attributed to dispersion forces. I don't know if you have ever handled glycerol, 1,2,3-propanetriol. This material is very syrupy. Can hydrogen bonding account for viscosity?