109 tem investigation the morphological study of the

  • No School
  • AA 1
  • 121

This preview shows page 49 - 51 out of 121 pages.

10.9 TEM Investigation The morphological study of the untreated and treated viscose fabrics shows no clear difference in the morphological structure of the viscose fabrics after treatment with 3-bromopropionic acid and nanometal oxides (Fig. 32 ). It arises due to the ability of the nanoparticles to form a transparent layer on the fabric surface. Fig. 32 TEM of untreated and pretreated viscose fabrics with 3-bromopropionic acid and nanometal oxides a untreated viscose, b pretreated viscose + Zn, c pretreated viscose + Al and d pretreated viscose + Ti]. (El-Sayeed et al. 2015 ) Advances in Nanotextile Finishes An Approach Towards Sustainability 43
Image of page 49
11 Finishes with Stimuli-Responsive Nanohydrogels 11.1 Overview Cotton fabric properties modi fi ed with nanoparticles of PNCS hydrogel reveal that they have acquired new smart responsiveness against pH and temperature. The thickness of modi fi ed fabrics does not exhibit signi fi cant difference with control samples, owing to small size of nanoparticles. There is no crease resistant effect on smart textiles, due to the BTCA, which links the hydrogel nanoparticle to the fabric. But, due to the involvement of the hydroxyl group in cross-linking process, the CRA of modi fi ed fabric has increased in comparison with control sample. Water vapour transition, air permeability, and wicking of smart modi fi ed cotton fabric are the main properties studied for determining fabric comfort (Bashari et al. 2015 ). Surface modi fi cation systems containing pH and temperature dual-responsive nanohydrogels due to the small size of particles show no negative effects on mentioned comfort parameters and the wicking of modi fi ed fabric is increased especially at the temperature above LCST (>32 °C). Ultimately, the fi ndings con- fi rm that the controlled contraction or expansion of the dual-responsive nanopar- ticles confers on the textile material smart properties, particularly with liquid management, and the functional material obtained reacts satisfactorily to the changes in ambient conditions as well as maintains the individual comfort. There are good prospects of using such smart cotton as an advanced material in sports, medical textiles, and other technical areas of applications. 11.2 Related Aspects Hydrogels or also known as hydrophilic gels are cross-linked polymeric materials capable of absorption of lot of water without dissolving. The properties of softness, smartness, and the capacity to store water render them suitable for a number of uses (Roy et al. 2010 ). Certain hydrogels can show abrupt volume changes in response to external stimuli like temperature, pH, electric and magnetic fi elds, solvent quality, and light (Jocic et al. 2009 ). In recent years, more research developments in the functional fi nishing of textiles by stimuli-responsive polymeric systems are being made. Researchers have proven that they could apply submicron hydrogels on textiles in very thin layers. More surface-to-weight ratios of nanohydrogels than microhydrogels or bulk hydrogels make them more sensitive (Hu et al. 2012 ).
Image of page 50
Image of page 51

You've reached the end of your free preview.

Want to read all 121 pages?

  • Fall '19
  • N. Gokarneshan

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes
A+ icon
Ask Expert Tutors