Effect of straight-chain alcohols on the physicochemical properties of calcium lignosulfonate

Qiu, Xueqing; Yan, Mingfang; Yang, Dongjie; Pang, Yongqiang; Deng, Yonghong

doi:10.1016/j.jcis.2009.05.072

Cited by 45 publications

(45 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The lypohydrophilic character endows lignosulfonate with marked interfacial activity and physicochemical properties such as wettability, adsorptivity, and dispersive ability, and so it can be used as effective interfacial additive in many industrial fields. 3,4 The studies on the microscopic structure of individual lignosulfonate molecules in solution had been carried out by many researchers. 5, 6 Rezanowich and Goring considered that the lignosulfonate molecules form microgels in solution, and this standpoint was further elaborated by others.…”

Section: Introductionmentioning

confidence: 99%

Aggregation Behavior of Sodium Lignosulfonate in Water Solution

et al. 2010

Self Cite

View full text Add to dashboard Cite

Lignosulfonate is a type of macromolecular surfactant widely used as interfacial additive in various industrial fields and it is produced during chemical pulping process. In this paper, we present a new effective method for measurement of the critical aggregation concentration (CAC) of sodium lignosulfonate (SL) in water solution, with which a value of 0.38 g L(-1) was obtained. Through the determination of CAC and observation by DLS, the state and dynamics of the formation of the SL micelles were disclosed. The results showed that SL was the state of individual molecules when its mass concentration was less than CAC; the individual SL molecules started to aggregate above CAC and thus micelles formed and grew with increasing SL concentration. The SL solution was quickly frozen and the structures of SL molecules or micelles were observed by ESEM, revealing that the spherical micelles were the main form of SL in the solution. Based on the results, the spherical hollow vesicular structure is proposed as a model of the aggregated micelles of SL in the solution.

show abstract

Section: Introductionmentioning

confidence: 99%

Aggregation Behavior of Sodium Lignosulfonate in Water Solution

et al. 2010

Self Cite

View full text Add to dashboard Cite

show abstract

“…where M n is 9100 g/mol, K M is given in Table 2, r e is the classical electron radius (cm), c is the concentration of lignosulfonate in solution (g/cm 3 ), and N A is the Avogadro number. The normalization is only approximate because of the polydisperse nature of the studied lignosulfonate.…”

Section: ■ Resultsmentioning

confidence: 99%

“…Lignosulfonate is known to be surface active, particularly at high concentrations. 3 Long chain alcohols have been shown to improve slightly the surface activity of calcium lignosulfonate, 3 and it has been suggested that lignosulfonate forms mixed surfactant systems with anionic surfactants. 4 Both the ability to form mixed surfactant systems and association with long chain alcohols, in addition to the possible self-association, are related to the shape and distribution of charged as well as uncharged groups on the macromolecular surface.…”

Section: ■ Introductionmentioning

confidence: 99%

Distribution of Counterions around Lignosulfonate Macromolecules in Different Polar Solvent Mixtures

Vainio¹,

Lauten

Haas

et al. 2012

Langmuir

View full text Add to dashboard Cite

Lignosulfonate is a colloidal polyelectrolyte that is obtained as a side product in sulfite pulping. In this work we wanted to study the noncovalent association of the colloids in different solvents, as well as to find out how the charged sulfonate groups are organized on the colloid surface. We studied sodium and rubidium lignosulfonate in water-methanol mixtures and in dimethyl formamide. The number average molecular weights of the Na- and Rb-lignosulfonate fractions were 7600 g/mol and 9100 g/mol, respectively, and the polydispersity index for both was 2. Anomalous small-angle X-ray scattering (ASAXS) was used for determining the distribution of counterions around the Rb-lignosulfonate macromolecules. The scattering curves were fitted with a model constructed from ellipsoids of revolution of different sizes. Counterions were taken into account by deriving an approximative formula for the scattering intensity of the Poisson-Boltzmann diffuse double layer model. The interaction term between the spheroidal particles was estimated using the local monodisperse approximation and the improved Hayter-Penfold structure factor given by the rescaled mean spherical approximation. Effective charge of the polyelectrolyte and the local dielectric constant of the solvent close to the globular polyelectrolyte were followed as a function of the methanol content in the solvent and lignosulfonate concentration. The lignosulfonate macromolecules were found to aggregate noncovalently in water-methanol mixtures with increasing methanol or lignosulfonate content in a specific directional manner. The flat macromolecule aggregates had a nearly constant thickness of 1-1.4 nm, while their diameter grew when counterion association onto the polyelectrolyte increased. These results indicate that the charged groups in lignosulfonate are mostly at the flat surfaces of the colloid, allowing the associated lignosulfonate complexes to grow further at the edges of the complex.

show abstract

“…Lig commonly serves as anionic surfactant with high absorptivity, wettability, dispersibility and other colloidal properties [19]. It contains sophisticated structure on account of different phenolic units such as the sinapyl alcohol (S), coniferyl alcohol (G) and p-coumaryl alcohol (H) [15,16,19,20], among which methoxy and phenol groups can convert into quinone groups, and the reversible redox reaction between quinone and hydroquinone will contribute the storage of electrons and protons [15,16,21,22]. Nevertheless, because of its intrinsic insulation, Lig cannot be directly applied for electrodes.…”

Section: Introductionmentioning

confidence: 99%