Issue 84, 2017, Issue in Progress
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RSC Advances

A robust method to calculate the volume phase transition temperature (VPTT) for hydrogels and hybrids†

Sulalit Bandyopadhyay, ORCID logo *a   Anuvansh Sharma, ORCID logo a   Muhammad Awais Ashfaq Alvi,a   Rajesh Rajub  and  Wilhelm Robert Glommac  

* Corresponding authors

a Ugelstad Laboratory, Department of Chemical Engineering, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
E-mail: sulalit.bandyopadhyay@ntnu.no, ratnavo@gmail.com
Tel: +47-73550339

b Department of Chemistry, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway

c Department of Biotechnology and Nanomedicine, SINTEF Materials and Chemistry, N-7465 Trondheim, Norway

Abstract

Here, we report three different methods to determine the volume phase transition temperature (VPTT) of various systems including poly(N-isopropylacrylamide) (pNIPAm) based nanogels, Au nanoclusters and a combination of inorganic and polymeric systems. Although all the methods reveal close VPTT values, we suggest that method III is the least computation dependent and most reliable. In an attempt to define the overall system reversibility, a predictive reversibility parameter (RP) was defined that explains the system behavior at each state point. RP takes into consideration all the system states during both heating and cooling cycles. Reversible systems were found to have RP values less than 1, while irreversible systems were observed to have RP values of 2. We predict that real systems will show RP values between 1 and 2. Thus, by knowing both the system's VPTT and its reversibility, a particular application can be designed or upgraded.

Graphical abstract: A robust method to calculate the volume phase transition temperature (VPTT) for hydrogels and hybrids

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Article information

DOI
https://doi.org/10.1039/C7RA10258E
Article type
Paper
Submitted
15 Sep 2017
Accepted
13 Nov 2017
First published
17 Nov 2017
This article is Open Access
Creative Commons BY-NC license

RSC Adv., 2017,7, 53192-53202

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A robust method to calculate the volume phase transition temperature (VPTT) for hydrogels and hybrids

S. Bandyopadhyay, A. Sharma, M. A. Ashfaq Alvi, R. Raju and W. R. Glomm, RSC Adv., 2017, 7, 53192 DOI: 10.1039/C7RA10258E

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