J4 ›› 2013, Vol. 10 ›› Issue (2): 139-147.doi: 10.1016/S1672-6529(13)60208-5

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Thibaut V J Charpentier, Anne Neville, Paul Millner, Rob Hewson, Ardian Morina   

  • 收稿日期:2012-12-08 修回日期:2013-02-08 出版日期:2013-04-06 发布日期:2013-04-10
  • 作者简介:Thibaut V J Charpentier, Anne Neville, Paul Millner, Rob Hewson, Ardian Morina

An Investigation of Freezing of Supercooled Water on Anti-Freeze Protein Modified Surfaces

Thibaut V J Charpentier, Anne Neville, Paul Millner, Rob Hewson, Ardian Morina   

  1. Institute of Engineering Thermofluids, Surfaces and Interfaces (iETSI), Mechanical Engineering, University of Leeds, LS2 9JT, Leeds, UK
  • Received:2012-12-08 Revised:2013-02-08 Online:2013-04-06 Published:2013-04-10
  • Contact: Thibaut V J Charpentier E-mail:mentch@leeds.ac.uk
  • About author:Thibaut V J Charpentier, Anne Neville, Paul Millner, Rob Hewson, Ardian Morina

Abstract:

This work investigates how functionalization of aluminium surfaces with natural type III Anti-Freeze Protein (AFP) affects the mechanism of heterogeneous ice nucleation. First the bulk ice nucleation properties of distilled water and aqueous solution of AFP were evaluated by differential scanning calorimetry. Then the modified surface was characterized by Secondary Ions Mass Spectroscopy (SIMS), Fourier Transform InfraRed (FTIR) spectroscopy and contact angle measurement. Freezing ex-periments were then conducted in which water droplets underwent a slow controlled cooling. This study shows that compared to uncoated aluminium, the anti-freeze proteins functionalized surfaces exhibit a higher and narrower range of freezing tempera-ture. It was found that these proteins that keep living organisms from freezing in cold environment act in the opposite way once immobilized on surfaces by promoting ice nucleation. Some suggestions regarding the mechanism of action of the observed phenomena were proposed based on the Classical Nucleation Theory (CNT).

Key words: anti-freeze protein, surface functionalization, ice nucleation temperature, ice-like monolayer