Surfactant adsorption by total internal reflection Raman spectroscopy. Part III: Adsorption onto cellulose

Abstract

The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Abstract TIR Raman spectroscopy has been used to study the adsorption of surfactants onto cellulose. The cellulose was prepared by Langmuir-Blodgett deposition of trimethylsilylcellulose onto silica followed by removal of the trimethylsilyl groups with acid to generate a hydrophilic surface. The reaction was followed in situ with Raman spectroscopy, revealing a two-step hydrolysis. Adsorption isotherms of hexadecyltrimethylammonium bromide (CTAB) and Triton X-100(TX-100) on hydrophilic cellulose were obtained by TIR Raman scattering under quasi-equilibrium conditions where the bulk concentration was slowly but continuously varied. The isotherms of both surfactants are almost linear, in contrast to the isotherms on hydrophilic silica. The CTAB isotherm shows hysteresis depending on whether the concentration of the surfactant is increasing or decreasing due to a slow adsorption region. A mixture of TX-100 and CTAB shows ideal adsorption, in contrast to adsorption of the same mixture on silica where there is a strong cooperative interaction at low CTAB surface coverage.

Carbon nanotube/cellulose papers with high performance in electric heating and electromagnetic interference shielding

“…It is interesting to note that the D and G bands of M-1 paper was detected at higher wavenumbers, compared with the pristine MWCNT [20], which demonstrates the presence of noncovalent pp interaction between the MWCNT surface and the aromatic ring of SDBS, and hydrophobic interaction between the nanotube surface and the hydrocarbon chain of SDBS [21]. In addition, the specific interaction of anionic surfactant with the hydrophilic groups of cellulose was proven to be present [22,23]. It is thus reasonable to contend that the pristine MWCNTs can be coated tightly on cellulose papers via the multiple specific interactions among MWCNT, SDBS, and cellulose, as represented schematically in Fig.…”

Functional Patterning of Biopolymer Thin Films Using Enzymes and Lithographic Methods

“…Common deposition techniques for such films are based on the regeneration of cellulose from organosoluble derivatives or solutions in ionic liquids 11. A promising derivative for the preparation of cellulose thin films is trimethylsilyl cellulose (TMSC) which is soluble in toluene and can be regenerated to pure cellulose by a treatment with vapors or solutions of hydrochloric acid 12, 13. Besides the aforementioned advantages of cellulose and its thin films, many applications require a further patterning step to generate micro‐ or nano‐structured surface features.…”

Optical-based spectroscopic methods for measuring chemical, optical, and physical properties of thin polymer waveguide films

“…In addition to its use in measuring polymers, TIR Raman spectroscopy has been used to follow absorption kinetics, [84][85][86][87] and characterize interfaces [87][88][89][90][91] and surfaces. [92][93][94] The theory of Raman scattering generated with evanescent wave excitation has been…”