Ulster University Logo

Ulster Institutional Repository

Adsorption of bovine serum albumin on amorphous carbon surfaces studied with dip pen nanolithography

Biomedical Sciences Research Institute Computer Science Research Institute Environmental Sciences Research Institute Nanotechnology & Advanced Materials Research Institute

Yadav, PK, McKavanagh, F, Maguire, PD and Lemoine, P (2011) Adsorption of bovine serum albumin on amorphous carbon surfaces studied with dip pen nanolithography. Applied Surface Science, 257 . [Journal article]

[img]PDF - Accepted Version
1278Kb

URL: http://sciencedirect.dogsoso.com/science?_ob=MImg&_imagekey=B6THY-53M15Y5-D-1&_cdi=5295&_user=126978&_pii=S0169433211013134&_origin=browse&_zone=rslt_list_item&_coverDate=08%2F22%2F2011&_sk=999999999&wchp=dGLzVzz-zSkzS&md5=2ae9e19a2ba92486a8118e7239b97b3f

DOI: Adsorption of bovine serum albumin on amorphous carbon surfaces studied with dip pen nanolithography

Abstract

This article reports the use of dip pen nanolithography (DPN) for the study of adsorption of bovine serum albumin (BSA) proteins on amorphous carbon surfaces; tetrahedral amorphous carbon (t-aC) and silicon doped hydrogenated amorphous carbon (a-C:H:Si). Contact angle study shows that the BSA proteins reduce the contact angle on both carbon materials. We also noticed that the drop volume dependence is consistent with a negative line tension; i.e. due to an attractive protein/surface interaction. The DPN technique was used to write short-spaced (100 nm) BSA line patterns on both samples. We found a line merging effect, stronger in the case of the a-C:H:Si material. We discuss possible contributions from tip blunting, scratching, cross-talk between lever torsion and bending and nano-shaving of the patterns. We conclude that the observed effect is caused in large measure by the diffusion of BSA proteins on the amorphous carbon surfaces. This interpretation of the result is consistent with the contact angle data and AFM force curve analysis indicating larger tip/surface adhesion and spreading for the a-C:H:Si material. We conclude by discussing the advantages and limitations of DPN lithography to study biomolecular adsorption in nanoscale wetting environments.

Item Type:Journal article
Faculties and Schools:Faculty of Computing & Engineering
Faculty of Computing & Engineering > School of Engineering
Research Institutes and Groups:Engineering Research Institute
Engineering Research Institute > Nanotechnology & Integrated BioEngineering Centre (NIBEC)
ID Code:19979
Deposited By:Dr Patrick Lemoine
Deposited On:13 Sep 2011 15:11
Last Modified:13 Sep 2011 15:11

Repository Staff Only: item control page