Hilda Zahra

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Close Packing of Cellulose and Chitosan in Regenerated Cellulose Fibers Improves Carbon Yield and Structural Properties of Respective Carbon Fibers

Biomacromolecules (2020)

Hilda Zahra Daisuke Sawada Chamseddine Guizani Yibo Ma Shogo Kumagai

A low carbon yield is a major limitation for the use of cellulose-based filaments as carbon fiber precursors. The present study aims to investigate the use of an abundant biopolymer chitosan as a natural charring agent particularly on enhancing the carbon yield of the cellulose-derived carbon fiber. The ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH]OAc) was used for direct dissolution of cellulose and chitosan and to spin cellulose–chitosan composite fibers through a dry-jet wet spinning process (Ioncell). The homogenous distribution and tight packing of cellulose and chitosan revealed by X-ray scattering experiments enable a synergistic interaction between the two polymers during the pyrolysis reaction, resulting in a substantial increase of the carbon yield and preservation of mechanical properties of cellulose fiber compared to other cobiopolymers such as lignin and xylan.

Regenerated cellulose

Biopolymer

Viscose

Cellulose fiber

10.1021/acs.biomac.0c01117

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Citations (37)

Process-dependent nanostructures of regenerated cellulose fibres revealed by small angle neutron scattering

Polymer (2021)

Daisuke Sawada Yoshiharu Nishiyama Thomas Röder Lionel Porcar Hilda Zahra

The nanometric internal structure of polymeric fibres is fundamental for their mechanical properties. Two-dimensional small angle neutron scattering patterns were collected to obtain structural parameters of the elementary fibrils in regenerated cellulose fibres prepared by various fibre spinning technologies. Scattering features were fitted to model functions to derive parameters such as elementary fibril radius, long period of the repeating units of crystal and amorphous phase along the fibre axis, degree of orientation, and ellipticity. The correlation between structural parameters and the mechanical properties was studied for the fibres of different existing spinning processes and for the high-strength fibres. Former group showed high correlation with mechanical properties. The latter group showed generally lower correlation, but showed relatively high correlation with the long period. These structural parameters provide a basis for understanding the structure-property relationship of regenerated cellulose fibres as function of spinning types and conditions for further optimization.

Small-angle X-ray scattering

Melt spinning

Regenerated cellulose

10.1016/j.polymer.2021.123510

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Fast and quantitative compositional analysis of hybrid cellulose-based regenerated fibers using thermogravimetric analysis and chemometrics

Cellulose (2021)

Chamseddine Guizani Mikaela Trogen Hilda Zahra Leena Pitkänen Kaniz Moriam

Cellulose can be dissolved with another biopolymer in a protic ionic liquid and spun into a bicomponent hybrid cellulose fiber using the Ioncell® technology. Inside the hybrid fibers, the biopolymers are mixed at the nanoscale, and the second biopolymer provides the produced hybrid fiber new functional properties that can be fine-tuned by controlling its share in the fiber. In the present work, we present a fast and quantitative thermoanalytical method for the compositional analysis of man-made hybrid cellulose fibers by using thermogravimetric analysis (TGA) in combination with chemometrics. First, we incorporated 0-46 wt.% of lignin or chitosan in the hybrid fibers. Then, we analyzed their thermal decomposition behavior in a TGA device following a simple, one-hour thermal treatment protocol. With an analogy to spectroscopy, we show that the derivative thermogram can be used as a predictor in a multivariate regression model for determining the share of lignin or chitosan in the cellulose hybrid fibers. The method generated cross validation errors in the range 1.5-2.1 wt.% for lignin and chitosan. In addition, we discuss how the multivariate regression outperforms more common modeling methods such as those based on thermogram deconvolution or on linear superposition of reference thermograms. Moreover, we highlight the versatility of this thermoanalytical method-which could be applied to a wide range of composite materials, provided that their components can be thermally resolved-and illustrate it with an additional example on the measurement of polyester content in cellulose and polyester fiber blends. The method could predict the polyester content in the cellulose-polyester fiber blends with a cross validation error of 1.94 wt.% in the range of 0-100 wt.%. Finally, we give a list of recommendations on good experimental and modeling practices for the readers who want to extend the application of this thermoanalytical method to other composite materials.The online version contains supplementary material available at 10.1007/s10570-021-03923-6.

Thermogravimetric analysis

Chemometrics

Biopolymer

Cellulose fiber

10.1007/s10570-021-03923-6

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Citations (10)

Axial compression strength of circular and square UHPC-filled stiffened steel tubular columns

Journal of Constructional Steel Research (2025)

Hilda Zahra Nabil Mahmoud Ahmed Badr Fikry A. Salem Mohamed Ghannam

Square (algebra)

10.1016/j.jcsr.2025.109362

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Structural characterization of cellulose-based composite fibers from ionic liquid [DBNH]OAc

Daisuke Sawada Hilda Zahra Mikaela Trogen Herbert Sixta Michael Hummel

Characterization

Cellulose fiber

Source

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Carbon fibers made from multi-biopolymer precursor fibers spun from ionic liquid solution

Michael Hummel Mikaela Trogen Hilda Zahra Daisuke Sawada Herbert Sixta

Biopolymer

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Metal(loid) immobilization in soils with biochars pyrolyzed in N2 and CO2 environments

The Science of The Total Environment (2018)

Avanthi Deshani Igalavithana Xiao Yang Hilda Zahra Filip Tack Daniel C.W. Tsang

10.1016/j.scitotenv.2018.02.185

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Citations (53)

Characterization of composite fibers from wood-based polymers: Investigation as a carbon fiber precursor

Daisuke Sawada Hilda Zahra Mikaela Trogen Herbert Sixta Nolene Byrne

Characterization

Source

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Citations (0)

Evaluation of Keratin–Cellulose Blend Fibers as Precursors for Carbon Fibers

ACS Sustainable Chemistry & Engineering (2022)

Hilda Zahra Julian Selinger Daisuke Sawada Yu Ogawa Hannes Orelma

One main challenge to utilize cellulose-based fibers as the precursor for carbon fibers is their inherently low carbon yield. This study aims to evaluate the use of keratin in chicken feathers, a byproduct of the poultry industry generated in large quantities, as a natural charring agent to improve the yield of cellulose-derived carbon fibers. Keratin-cellulose composite fibers are prepared through direct dissolution of the pulp and feather keratin in the ionic liquid 1,5-diazabicyclo[4.3.0]non-5-enium acetate ([DBNH]OAc) and subsequent dry jet wet spinning (so-called Ioncell process). Thermogravimetric analysis reveals that there is an increase in the carbon yield by ∼53 wt % with 30 wt % keratin incorporation. This increase is comparable to the one observed for lignin-cellulose composite fibers, in which lignin acts as a carbon booster due to its higher carbon content. Keratin, however, reduces the mechanical properties of cellulose precursor fibers to a lesser extent than lignin. Keratin introduces nitrogen and induces the formation of pores in the precursor fibers and the resulting carbon fibers. Carbon materials derived from the keratin-cellulose composite fiber show potential for applications where nitrogen doping and pores or voids in the carbon are desirable, for example, for low-cost bio-based carbons for energy harvest or storage.

Dissolving pulp

Carbon fibers

10.1021/acssuschemeng.2c00976

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Citations (10)

Effect of biochars produced under N2 and CO2 on soil heavy metal(loid) immobilization

Avanthi Deshani Igalavithana SS Lee Xingjian Yang Hilda Zahra Filip Tack

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Citations (0)