DC conductivity, cationic exchange capacity, and specific surface area related to chemical composition of pore lining chlorites

Henn, F.; Durand, Claudine; Cérepi, Adrian; Brosse, É.; Giuntini, J. C.

doi:10.1016/j.jcis.2007.02.062

Cited by 18 publications

(12 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…On the other hand results indicated a correlation between CEC and SSA (R PS = 0.53; R LS = 0.60). This positive relation is in accordance with the findings of Farrar and Coleman (1967), Wilczynski et al (1993) and Henn et al (2007). The 25-30% increase in SSA BET after 80 weeks in control samples without plant litter addition corresponded to a 20-25% increase in CEC indicating that the additional surfaces generated a corresponding amount of new sorption sites, most probably in intermediate layers of clay minerals and on oxygen atoms of silicate layers (Yariv, 1985).…”

Section: Changes In Surface Enthalpy and Ssa Due To Om Coveragesupporting

confidence: 90%

Short-term effects of plant litter addition on mineral surface characteristics of young sandy soils

2015

View full text Add to dashboard Cite

Section: Changes In Surface Enthalpy and Ssa Due To Om Coveragesupporting

confidence: 90%

Short-term effects of plant litter addition on mineral surface characteristics of young sandy soils

2015

View full text Add to dashboard Cite

“…These types of materials are ionic exchangers [52]; therefore, the ions in the interlayer space are mobile. Water is an important key for the mobility of the ions in the interlayer space [12,53]. A low amount of water in the interlayer region can diminish the ionic mobility of the ions [53].…”

Section: Resultsmentioning

confidence: 99%

“…Water is an important key for the mobility of the ions in the interlayer space [12,53]. A low amount of water in the interlayer region can diminish the ionic mobility of the ions [53]. Furthermore, the water´s ability to facilitate ion conduction is dependent on the charge density of these ion [12,53,54].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Structural and Electrical Studies for Birnessite-Type Materials Synthesized by Solid-State Reactions

2019

View full text Add to dashboard Cite

The focus of this paper is centered on the thermal reduction of KMnO4 at controlled temperatures of 400 and 800 °C. The materials under study were characterized by atomic absorption spectroscopy, thermogravimetric analysis, average oxidation state of manganese, nitrogen adsorption–desorption, and impedance spectroscopy. The structural formulas, found as a result of these analyses, were K 0.29 + ( M n 0.84 4 + M n 0.16 3 + ) O 2.07 · 0.61 H 2 O and K 0.48 + ( M n 0.64 4 + M n 0.36 3 + ) O 2.06 · 0.50 H 2 O . The N2 adsorption–desorption isotherms show the microporous and mesoporous nature of the structure. Structural analysis showed that synthesis temperature affects the crystal size and symmetry, varying their electrical properties. Impedance spectroscopy (IS) was used to measure the electrical properties of these materials. The measurements attained, as a result of IS, show that these materials have both electronic and ionic conductivity. The conductivity values obtained at 10 Hz were 4.1250 × 10−6 and 1.6870 × 10−4 Ω−1cm−1 for Mn4 at 298 and 423 K respectively. For Mn8, the conductivity values at this frequency were 3.7074 × 10−7 (298) and 3.9866 × 10−5 Ω−1cm−1 (423 K). The electrical behavior was associated with electron hopping at high frequencies, and protonic conduction and ionic movement of the K+ species, in the interlayer region at low frequencies.

show abstract

“…In this group, the conductivity is mainly reliant upon the proton movement between the clay layers and the polymerization of organics in the structure 10–14. The second one consists of studies on the conductivity and dielectric properties that are mainly carried out on polycrystal compounds, alloyed thin film, and polymer–clay composites 14–22. In addition, the electrical conductivity of clay materials has two components: (a) the volume conductivity, (b) the surface conductivity, which is directly related to the cation exchange capacity (CEC) 23…”

Section: Introductionmentioning

confidence: 99%

Investigation of temperature, thermodynamic parameters and dielectrical properties of poly(vinylimidazole)–Na–bentonite nanocomposite

Kaya

Esmer

Tekin

et al. 2010

J of Applied Polymer Sci

View full text Add to dashboard Cite

The adsorption of poly(vinylimidazole) (PVI) onto Na-Bentonite from aqueous solutions has been investigated as a function of temperature. According to the experimental results, the adsorption of PVI decreases with temperature from 25 to 55 C. The study of temperature effect has been quantified by calculating various thermodynamic parameters such as Gibbs free energy, enthalpy and entropy changes. The electrical and dielectrical properties of PVI-Na-Bentonite composite have been investigated. The current-voltage studies show that conductivity was increased at T ¼ 25 C. The dc conductivity was calculated at T ¼ 25 C. The samples show typical dielectric behavior from capacitive measurements. Depending on maximum interactions at 25 C, ac conductivity and loss factors are also in high values. Especially, at frequencies over 1.5 kHz, it was seen completely clay behavior. Variation of tangent loss factor-frequency shows decreasing of polarization density in structure in high frequency.

show abstract

DC conductivity, cationic exchange capacity, and specific surface area related to chemical composition of pore lining chlorites

Cited by 18 publications

References 18 publications

Short-term effects of plant litter addition on mineral surface characteristics of young sandy soils

Short-term effects of plant litter addition on mineral surface characteristics of young sandy soils

Structural and Electrical Studies for Birnessite-Type Materials Synthesized by Solid-State Reactions

Investigation of temperature, thermodynamic parameters and dielectrical properties of poly(vinylimidazole)–Na–bentonite nanocomposite

Contact Info

Product

Resources

About