Effect of the carbohydrate composition of bleached kraft pulp on the dielectric and electrical properties of paper

Saukkonen, Esa; Lyytikäinen, Katja; Backfolk, Kaj; Maldžius, Robertas; Sidaravičius, Jonas; Lozovski, Tadeus; Poškus, Andrius

doi:10.1007/s10570-015-0556-8

Cited by 12 publications

(8 citation statements)

References 18 publications

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“…The adsorbed water in paper products is partitioned between the hydrogen-bonding capable constituents in the paper. This confined water has a lower dielectric constant than free water [13,28]. It is this water that is probed by dielectric spectroscopy in order to understand the physicochemical differences between virgin fibers, recycled fibers, and mixtures of the two per effective medium theory [12].…”

Section: Discussionmentioning

confidence: 99%

“…For example, previous work has shown that below 10% moisture content, the dielectric loss measured in paper is attributable to the dipolar mechanism of water bound to cellulose [29]. Other constituents, such as fillers, colorants, sizing agents, etc., can also affect the partitioning of bound water [13].…”

Section: Discussionmentioning

confidence: 99%

“…The DS technique takes advantage of the changes in the net electrical characteristics of the paper product due to compositional changes with increasing post-consumer waste (PCW) recycled fiber content. The technique also provides additional information, such as information about the microstructure of the analyte, beyond what can be learned from other characterization techniques such as electron microscopy and thermal analysis techniques (e.g., dynamic mechanical analysis) [12,13].…”

Section: Introductionmentioning

confidence: 99%

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Contactless Resonant Cavity Dielectric Spectroscopic Studies of Recycled Office Papers

et al. 2019

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Current product composition and quality test methods for the paper and pulp industries are rooted in wet-bench chemistry techniques which cannot be used to distinguish between virgin and secondary fibers. We have recently demonstrated the application of an in situ and nondestructive assessment method based on dielectric spectroscopy (DS), which can address this deficiency in the testing of paper. The DS technique, which employs a resonant microwave cavity, could be applicable to quality assurance techniques such as gauge capability studies and real-time statistical process control (SPC), and may have inherent forensic capabilities. In this paper, we show how this DS technique can be used to distinguish between office copier paper products which may contain recycled fibers. We show a reasonable correlation between the dielectric characteristics (e.g., dielectric loss) and the atomistic level chemical changes that result from the paper recycling process.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Contactless Resonant Cavity Dielectric Spectroscopic Studies of Recycled Office Papers

et al. 2019

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“…Namely, in the case of high air humidity (80% RH), part of the absorbed water in the fabric is located as bound water and the other part as bulk-free water. According to Saukkonen et al (2015), adsorbed water molecules are neither free to move around nor free to change their orientation, and consequently their ′ are much lower than that of free water ( ′ = 81). For oxidatively modified jute fabrics having higher crystallinity and fabric porosity (Tables 1 and 2) compared to the alkali modified, it can be assumed that absorbed water is located as bulk-free water, and, therefore, it has a strong influence on fabrics' ′ .…”

Section: Effective Relative Dielectric Permeabilitymentioning

confidence: 99%

Electro-physical properties of jute fabrics in a condition of high humidity - Effect of fabric chemical composition and coating with Cu-based nanoparticles

Ivanovska

Maletić

Djokić

et al. 2021

Preprint

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The electro-physical properties of raw and chemically modified jute fabrics were studied as complex phenomena of the interaction between the fabrics’ chemical composition, crystallinity, moisture sorption, COOH group content, structural characteristics, and frequency of the electric field. At 80% relative air humidity, all chemically modified jute fabrics have 38–179% and 1.7–5.4 times higher dielectric loss tangent and effective relative dielectric permeability compared to unmodified, respectively. To further improve these properties, fabrics were treated with CuSO4 and Cu-based nanoparticles were in situ synthesized on their surface by reduction. A few single Cu-based nanoparticles were observed across the alkali modified fabric’s surface, while single and agglomerated nanoparticles were distributed over the oxidatively modified fabric’s surface. No matter whether metallic Cu or copper oxide (Cu2O or CuO) nanostructures (or their mixtures) are synthesized (proven by XRD), excellent fabrics’ effective relative dielectric permeability is guaranteed. In other words, during the exploitation in specific conditions contributing to copper reduction, the jute fabrics will be able to store 21–163 times more energy from an external electric field than before the exploitation, which further extended their lifetime. On the other hand, with increasing the total content of Cu after the reduction and formation of single and agglomerated Cu-based nanoparticles, the movement of jute structural components’ molecules becomes difficult resulting in lower energy dissipation within the chemically modified than within unmodified fabric. Applied chemical modification and coating with Cu-based nanoparticles enables designing fabrics with predictable electro-physical properties, which is very important from the application point of view.

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“…In the case of paper materials, ε′′ at microwave frequencies arises primarily from the dielectric relaxation of adsorbed water molecules. The adsorbed water in papers is confined and therefore has a lower dielectric constant than free water (Saukkonen et al 2015). It is this confined water that is probed in order to understand the physico-chemical differences of papers of different ages, fiber furnishes and differing degradation by-products per effective medium theory (Steeman and van Turnhout 2003).…”

Section: Resonant Cavity Measurementmentioning

confidence: 99%

Contactless Resonant Cavity Dielectric Spectroscopic Studies of Cellulosic Paper Aging

et al. 2019

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The current analytical techniques for characterizing printing and graphic arts substrates, particularly those used to date and authenticate provenance, are destructive. This limits the amount of data that can be captured from an individual sample. For samples being evaluated in forensic and archeological investigations, any loss or degradation of the materials is undesirable. Furthermore, it is difficult to produce statistically relevant data for such analytes. We have shown elsewhere that a contactless microwave resonant cavity dielectric spectroscopy technique can discriminate between paper samples made from different plant fiber species based on their lignin content. In this publication, we demonstrate the utility of the contactless resonant cavity dielectric spectroscopy (RCDS) technique in the characterization of naturally and artificially aged paper samples. Based on our experimental results, we suggest that the technique could be used in forensic and archeological investigations of unique paper products.

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Effect of the carbohydrate composition of bleached kraft pulp on the dielectric and electrical properties of paper

Cited by 12 publications

References 18 publications

Contactless Resonant Cavity Dielectric Spectroscopic Studies of Recycled Office Papers

Contactless Resonant Cavity Dielectric Spectroscopic Studies of Recycled Office Papers

Electro-physical properties of jute fabrics in a condition of high humidity - Effect of fabric chemical composition and coating with Cu-based nanoparticles

Contactless Resonant Cavity Dielectric Spectroscopic Studies of Cellulosic Paper Aging

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