In situ atomic force microscopy of modified dextrin adsorption on hydrophobic and hydrophilic layered silicate minerals

Mierczyńska-Vasilev, Agnieszka; Beattie, David A.

doi:10.1016/j.jcis.2010.01.009

Cited by 21 publications

(4 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, there may be some negative charge due to the presence of adsorbed OH − ions, as observed for other hydrophobic surfaces such as silane monolayers and the oil/water interface. , There is therefore a possibility that the increased ionic strength may also reduce any potential electrostatic repulsion between the polymer and the surface. It should be noted that a negative charge at nonpolar hydrophobic surfaces is not always observed, for example, in the case of the basal plane of talc (advancing water contact angle 92°) …”

Section: Resultsmentioning

confidence: 99%

Reduction of Surface Hydrophobicity Using a Stimulus-Responsive Polysaccharide

et al. 2010

Self Cite

View full text Add to dashboard Cite

The adsorption of carboxymethyl cellulose (CMC) onto a hydrophobic self-assembled monolayer has been characterized using the quartz crystal microbalance (with dissipation monitoring, QCM-D). Adsorption was studied as a function of initial solution conditions. CMC adsorbs to a greater extent at high ionic strength (10(-1) M KCl as opposed to 10(-2) M KCl) or low pH (3 as opposed to 9). The solution conditions that yielded the lowest initial adsorbed amount (10(-2) M KCl, pH 9) were used as a reference to investigate the response of the adsorbed layer to a switch in solution conditions after adsorption (i.e., to higher ionic strength (10(-1) M KCl) or lower pH (pH 3)). The adsorbed layer released significant amounts of hydration water after each solution switch, as determined by the QCM-D measurements. This expulsion of hydration water was fully reversible. For the two solution switches, reducing the solution pH resulted in a more pronounced change in the amount of hydration water within the adsorbed CMC, accompanied by a distinct conformational change, as determined from a QCM D-f plot. In addition to studying adsorption using QCM-D, the effect of adsorbed CMC on surface hydrophobicity has been investigated using captive bubble contact angle measurements. The effect of the polymer on the contact angle of the surface was seen to be greatest when adsorbed at low pH or at higher ionic strength. CMC was also seen to have a significantly enhanced ability to reduce the surface hydrophobicity after both the ionic strength and pH switches, lowering the advancing water contact angle by 6 and 23° and the receding water contact angle by 10 and 40° for the ionic strength and pH switches, respectively. As with the change in hydration water content, the change in the contact angle of the polymer-coated surface following the solution switches was reversible.

show abstract

Section: Resultsmentioning

confidence: 99%

Reduction of Surface Hydrophobicity Using a Stimulus-Responsive Polysaccharide

et al. 2010

Self Cite

View full text Add to dashboard Cite

show abstract

“…36 The formed uniform pits provided high surface roughness (319.04 nm), which enhances the availability of adsorptive sites for heavy metal ions to get adhered and adsorbed. 37 (Table 3).…”

Section: Characterization Of Unmodied and Nickel Coated Nanoclaysmentioning

confidence: 99%

Electroless nickel coated nano-clay for electrolytic removal of Hg(ii) ions

et al. 2014

View full text Add to dashboard Cite

show abstract

“…After polymer adsorption on freshly cleaved ZnS, the surface was found to be much more hydrophobic. This is at first glance quite surprising, but is most likely due to two factors: (i) a complete layer of these two polymers on a hydrophilic surface has been seen to have a contact angle of around 25° [49], i.e. higher than the bare surface, so any adsorbed polymer material is unlikely to result in a lower contact angle; and more importantly (ii) the surface of the mineral will be undergoing oxidation throughout the course of the polymer adsorption, with the end result being that the surface will begin to resemble the oxidized sphalerite in terms of hydrophobicity.…”

Section: Bare Ps Dextrin So Dextrinmentioning

confidence: 99%