Adsorption of Polyetheramines on Montmorillonite at High pH

Cui, Yannan; Duijneveldt, Jeroen S. van

doi:10.1021/la103278v

Cited by 39 publications

(43 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…At pH < 4 and (1 : 1) electrolyte concentrations above 0.01 M, the edge is positively charged and exposed to other particles owing to the depression of the electric double layer, which results in a face-to-edge configuration [54]. In the present work, however, the clay suspensions were dialysed and at their natural pH, around 9 [47]. Under these conditions, the edges and faces are both negative [54].…”

Section: Discussion (A) Aqueous Clay Suspensionsmentioning

confidence: 76%

“…(b) Phase diagram of M1000-modified montmorillonite M1000 adsorbs strongly to the clay surface and this has been shown to involve an ion exchange mechanism [47]. The phase diagram changed dramatically after addition of M1000 to the system (figure 1b).…”

Section: Results (A) Phase Diagram Of Pure Montmorillonitementioning

confidence: 99%

“…It is, therefore, interesting to note that in the presence of M1000, where SALS suggests the stringlike aggregates are absent, the pattern observed on drying is also completely different (figure 4b) with no marked strands forming. At the concentrations used here, essentially all M1000 should adsorb to the clay surface leaving very little free in solution [47]. Therefore, the difference in structures between figure 4a,b is purely caused by the adsorption of M1000 onto the clay surface.…”

Section: (D) Optical Microscopymentioning

confidence: 90%

“…SAXS was carried out for 1 wt% MMT samples with or without M1000, with a scattering vector q ranging from 0.04 to 4 nm −1 [47], as shown in figure 2. The resulting intensity versus scattering vector plots superimpose perfectly and they follow a power law with an exponent of −2, characteristic for suspensions of plate-like particles.…”

Section: (C) Scattering Techniquesmentioning

confidence: 99%

“…4 Na 0.68 [25]. The purification and fractionation of the clay was described in detail in a previous study [47]. Jeffamine M1000 (referred to as M1000) is a polyetheramine with a molecular structure of CH 3 …”

mentioning

confidence: 99%

See 4 more Smart Citations

Modifying the structure and flow behaviour of aqueous montmorillonite suspensions with surfactant

Cui

Pizzey

Duijneveldt

2013

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

Colloidal suspensions of plate-like particles undergo a variety of phase transitions. The predicted isotropic/ nematic transition is often pre-empted by a sol/gel transition, especially in suspensions of the most commonly used natural swelling clay montmorillonite (MMT). A number of factors, including charge interactions, flexibility and salt concentration, may contribute to this competition. In this study, the effect of surfactant adsorption on suspensions of MMT was studied using rheology, small-angle X-ray scattering, static light scattering and optical microscopy. The addition of a polyetheramine surfactant reduced the moduli of the system and shifted the sol/gel transition to a much higher clay concentration, compared with suspensions of bare clay particles. Yet, scattering data revealed no change in suspension structure on length scales up to around a micrometre. Primary aggregates remain at this length scale and no nematic phase is formed. There is, however, a change in structure at large length scales (of order 20 µm) where light scattering indicates the presence of string-like aggregates that disappear on addition of surfactant. Microscope images of dried suspensions also revealed a string-like structure. The dried strings show strong birefringence and may consist of concentric cylinders, self-assembled from clay sheets.

show abstract

Section: Discussion (A) Aqueous Clay Suspensionsmentioning

confidence: 76%

Section: Results (A) Phase Diagram Of Pure Montmorillonitementioning

confidence: 99%

Section: (D) Optical Microscopymentioning

confidence: 90%

Section: (C) Scattering Techniquesmentioning

confidence: 99%

mentioning

confidence: 99%

See 3 more Smart Citations

Modifying the structure and flow behaviour of aqueous montmorillonite suspensions with surfactant

Cui

Pizzey

Duijneveldt

2013

Phil. Trans. R. Soc. A.

Self Cite

View full text Add to dashboard Cite

show abstract

Synergy of Pickering Emulsion and Sol‐Gel Process for the Construction of an Efficient, Recyclable Enzyme Cascade System

Shi

Wang

Zhang

et al. 2013

Adv Funct Materials

View full text Add to dashboard Cite

An efficient, easily recyclable enzyme cascade system based on nanoparticle‐stabilized capsules (NPSCs) is constructed through a synergy of a Pickering emulsion and sol‐gel process. Specifically, oligodopa‐coated titania nanoparticles (biomimetic titania) containing the first enzyme (FateDH) are synthesized through a bioadhesion‐assisted biomimetic mineralization approach. The biomimetic titania is then spontaneously assembled at the interface between the oil phase (hexadecane/butyl titanate (BuTi) mixture) and water phase during the formation of Pickering emulsions. The sol‐gel process of BuTi can produce not only butanol for assisting the formation of Pickering emulsions but also titania gel particles (sol‐gel titania) for cross‐linking the biomimetic titania through catechol‐titanium chelating. The NPSCs obtained, which contain the first enzyme, conjugate the second enzyme (FaldDH) onto the surface for constructing the enzyme cascade system. The system exhibits high activity and stability, particularly, superior recyclability for conversion of CO2 into formaldehyde. In detail, the system shows a formaldehyde yield of 50.0%, and can quickly float onto the air/water interface soon after stopping the agitation of reaction mixtures, which ensures that the formaldehyde yield keeps almost unaltered after 10 times recycling. This study will be useful for facile construction of a wealth of catalytic systems with efficient, recyclable attributes.

show abstract

Structure–property relationship of polyetheramines as clay‐swelling inhibitors in water‐based drilling fluids

Peng

Luo

Guo

et al. 2012

J of Applied Polymer Sci

View full text Add to dashboard Cite

The influences of structure parameters of polyetheramines as clay‐swelling inhibitors in water‐based drilling fluids on the application performances were studied. Interactions of polyetheramines with clays were investigated through elemental analysis (EA), X‐ray diffraction (XRD), and thermogravimetric analysis (TGA). The results showed that lower molecular weight, hydrophobic oxypropylene segment, and plentiful amino group of polyetheramines favored improvement of inhibitive properties, enhancement of adsorption abilities, and expelling interlayer bound waters of clays (as confirmed by cutting rolling test, bentonite inhibition test, EA, XRD, and TGA studies). Simultaneously, the polyetheramines did not produce adverse effect to filtration control of the drilling fluids. In addition, XRD patterns revealed that these polyetheramines could intercalate into interlayer spaces of clays and display a monolayer arrangement. The corresponding basal spacing of clays was correlated only with molecular weight of polyetheramines. The dense loading of polyetheramines in the interlayer of clays was beneficial in improving inhibitive properties. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

show abstract

Adsorption of Polyetheramines on Montmorillonite at High pH

Cited by 39 publications

References 35 publications

Modifying the structure and flow behaviour of aqueous montmorillonite suspensions with surfactant

Modifying the structure and flow behaviour of aqueous montmorillonite suspensions with surfactant

Synergy of Pickering Emulsion and Sol‐Gel Process for the Construction of an Efficient, Recyclable Enzyme Cascade System

Structure–property relationship of polyetheramines as clay‐swelling inhibitors in water‐based drilling fluids

Contact Info

Product

Resources

About