Exploring the rearrangement of amorphous cellulose model thin films upon heat treatment

Mohan, Tamilselvan; Spirk, Stefan; Kargl, Rupert; Doliška, Aleš; Vesel, Alenka; Salzmann, Ingo; Resel, Roland; Ribitsch, Volker; Stana‐Kleinschek, Karin

doi:10.1039/c2sm25911g

Cited by 78 publications

(75 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One would expect that the films significantly shrink during regeneration since the xanthate group is rather bulky and hydrogen bond formation would lead additionally to densification of the films as known for related cases involving other cellulose derivatives such as TMSC (Kontturi et al 2011;Mohan et al 2012). However, directly after exposure of the films to HCl vapors, the opposite phenomenon was observed.…”

Section: Resultsmentioning

confidence: 65%

Homogeneous cellulose thin films by regeneration of cellulose xanthate: properties and characterization

et al. 2017

Self Cite

View full text Add to dashboard Cite

The preparation and characterization of cellulose thin films derived from cellulose xanthate is reported. The films are prepared by depositing alkaline aqueous solutions of cellulose xanthate onto silicon wafers, followed by a spin coating step. Depending on the xanthate concentration used for spin coating, films with 50 and 700 nm thickness are obtained. The cellulose xanthate is converted to cellulose by exposing the films to HCl vapors over a period of 20 min. The conversion is monitored by ATR-IR spectroscopy, which allows for tracking the rupture of C-S and C=S bonds during the regeneration process. The conversion is accompanied by a reduction of the film thickness of ca 40% due to the removal of the bulky xanthate group. The films feature a homogenous, but porous morphology as shown by atomic force microscopy. Further, the films were investigated towards their interaction with Bovine Serum Albumin (BSA) and fibrinogen by means of multi-parameter surface plasmon resonance spectroscopy. Similar as other cellulose thin films BSA adsorption is low while fibrinogen adsorbs to some extent at physiological pH (7.4).

show abstract

Section: Resultsmentioning

confidence: 65%

Homogeneous cellulose thin films by regeneration of cellulose xanthate: properties and characterization

et al. 2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The developments came in waves and in parallel to advances in analytical techniques. The first studies by Bonhoeffer in 1938 mainly used gravimetric methods, giving the first proof of [71] the potential of heavy water in cellulose science. The use of FT-IR, however, particularly using polarized waves, allowed band assignment to given hydrogen bonds in cellulose.…”

Section: Discussionmentioning

confidence: 99%

“…8. The water equilibrium content of amorphous cellulose thin films is about 50-70% relative to the dry mass, whereas pre-dried films and pre-swollen/ dried films show lower Γ (30% and 45%, respectively) [71]. Thin films of nanofibrillar cellulose have also been investigated with this approach, yielding values of 70-85% (Fig.…”

Section: Scattering and Diffractionmentioning

confidence: 98%

Deuterium and Cellulose: A Comprehensive Review

Reishofer

Spirk

2015

Advances in Polymer Science

Self Cite

View full text Add to dashboard Cite

This contribution summarizes achievements in the understanding of cellulose accessibility, structure, and function with a particular focus on its interactions with deuteration. This review is the first to explicitly devote a discussion to deuteration of cellulose and highlights remarkable new findings in cellulose research as a result of the development of new experimental approaches, from simple weighing of deuterated samples to sophisticated techniques such as small angle neutron scattering and 2 H-NMR spectroscopy.

show abstract

“…The pores of the cellulosic fibers that were initially enlarged with alkaline swelling get closed due to the high drying temperature that subsequently follows the alkaline treatment (70 °C). The influence of high temperature on cellulose has also been reported, wherein it has been found that heat treatment increases surface hydrophobicity and reduces swelling capacity of cellulose model thin films [17]. As the solgel system covered the fiber surface and blocked its pores with applied antimicrobial coatings, the improvement in water retention of all the samples has been insignificant.…”

Section: Water Contact Angles and Water Retention Valuesmentioning

confidence: 96%