Evaluation of surface lignin on cellulose fibers with XPS

Johansson, Leena‐Sisko; Campbell, J.M.; Koljonen, Krista; Stenius, Per

doi:10.1016/s0169-4332(98)00920-9

Cited by 211 publications

(157 citation statements)

References 7 publications

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“…Figure 1 shows the surface concentration of C−C groups from XPS (carbon atoms bonded only to other carbon atoms or hydrogen) versus the atom oxygen/carbon ratio on the surface of bicomponent films before and after deacetylation. According to Johansson et al, 36 correlating the two independent variables for lignocellulose samples provide more reliable data than using either of them. Theoretical values for cellulose, milled wood lignin (MWL) and organosolv lignin 14 are indicated in Figure 1, as a reference.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

Preferential Adsorption and Activity of Monocomponent Cellulases on Lignocellulose Thin Films with Varying Lignin Content

et al. 2013

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Understanding the enzymatic hydrolysis of cellulose and the influence of lignin in the process are critical for viable production of fuels and chemicals from lignocellulosic biomass. The interactions of monocomponent cellulases with cellulose and lignin substrates were investigated by using thin films supported on quartz crystal microgravimetry (QCM) resonators. Trichoderma reesei exoglucanase (CBH-I) and endoglucanase (EG-I) bound strongly to both cellulose and lignin but EG-I exhibited a distinctive higher affinity with lignin, causing a more extensive inhibition of the cellulolytic reactions. CBH-I was found to penetrate into the bulk of the cellulose substrate increasing the extent of hydrolysis and film deconstruction. In the absence of a cellulose binding domain (CBD) and a linker, the CBH-I core adsorbed slowly and was not able to penetrate into the film. Conversely to CBH-I, EG-I exhibited activity only on the surface of the lignocellulose substrate even when containing a CBD and a linker. Interestingly, EG-I displayed a clearly different interaction profile as a function of contact time registered by QCM.

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Section: ■ Experimental Sectionmentioning

confidence: 99%

Preferential Adsorption and Activity of Monocomponent Cellulases on Lignocellulose Thin Films with Varying Lignin Content

et al. 2013

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“…The relatively low index value explains the enhancement of paper surface roughness where cellulose fibers randomly clumped together. In addition, these fibers are homogeneously covered with lignin [20]. On the other hand, thicker paper tends to stretch value explains paper stiffness reduction.…”

Section: Resultsmentioning

confidence: 99%

The Bulky Paper Properties Influence on the Adhesive Bond Strength

Preprotić¹,

Budimir²,

Lajić³

2012

Materials Testing

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Adhesive bond strength depends on adherend, adhesive and interphase zone. Adhesive joint includes bonded areas or binding edges across bonded layer. Research of adhesive bond strength focuses on understanding the properties of bulky paper associated with formation of the interphase and adhesive joint failure mode. The key contributors of good adhesive bond strength are paper rough surface necessary for mechanical interlocking, adequate adhesive flow and adaptationfor intimate interaction and acceptable adhesive setting time. Change of parameters has strong influence on final adhesive joint formation. Adhesive bond strength assessment involves adhesive joint strength determination. Pull test method is used for adhesive joint failure mode characterization. Furthermore, adhesive joint strength results directly explain bulky paper bind ability by perfect binding technique. FOGRA recommendation rating directly confirms paperback binding quality with bulky paper application. Understanding of bulky paper bind ability involves comprehensive physiochemical knowledge of material (paper, adhesive). In addition, this binding technique is more unique because of its interest for adhesive joint formation.

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“…4. What is of interest here is the aliphatic carbon region (C1) centred at 285.0 eV, which relates to the lignin content on the surfaces (Johansson et al 1999). The surface lignin can be estimated using Eq.…”

Section: The Influence Of Treatment Conditions On Hemicellulose and Lmentioning

confidence: 99%

Fibre Stress-Strain Response of High-Temperature Chemi-Thermomechanical Pulp Treated with Switchable Ionic Liquids

Duan¹,

Westerlind²,

Norgren³

et al. 2016

BioResources

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The removal of lignin from a high-temperature chemi-thermomechanical pulp (HT-CTMP) using a switchable ionic liquid prepared from an organic superbase (1,8-diazabicyclo-[5.4.0]-undec-7-ene (DBU)), monoethanol amine (MEA), and SO2 was investigated. The objective was to measure the fibre properties before and after removal of the lignin to analyse the contributions from lignin in the HT-CTMP fibre to the tensile properties. It was found that the fibre displacement at break -measured in zero span, which is related to fibre strain at break -was not influenced by the lignin removal in this ionic liquid system when tested dry. There was a small increase in displacement at break and a reduction in tensile strength at zero span when tested after rewetting. At short span, the displacement at break decreased slightly when lignin was removed, while tensile strength was almost unaffected when tested dry. Under rewetted conditions, the displacement at break increased and tensile strength decreased after lignin removal. Nevertheless, no dramatic differences in the pulp properties could be observed. Under the experimental conditions, treatment with the ionic liquid reduced the lignin content from 37.4 to 15.5 wt%.

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Evaluation of surface lignin on cellulose fibers with XPS

Cited by 211 publications

References 7 publications

Preferential Adsorption and Activity of Monocomponent Cellulases on Lignocellulose Thin Films with Varying Lignin Content

Preferential Adsorption and Activity of Monocomponent Cellulases on Lignocellulose Thin Films with Varying Lignin Content

The Bulky Paper Properties Influence on the Adhesive Bond Strength

Fibre Stress-Strain Response of High-Temperature Chemi-Thermomechanical Pulp Treated with Switchable Ionic Liquids

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