Interactions of cationic dendrimers with hematite mineral

Pan, Zhong-Hua; Somasundaran, P.; Turro, Nicholas J.; Jockusch, Steffen

doi:10.1016/j.colsurfa.2004.01.019

Cited by 24 publications

(15 citation statements)

References 11 publications

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“…Experimental investigations of charged dendrimer adsorption have also been presented [13][14][15][16][17][18][19][20][21]. These studies report that adsorption of charged dendrimers is due to dendrimer-surface electrostatic interactions and that the adsorbed dendrimers resemble flat disks.…”

Section: Introductionmentioning

confidence: 94%

“…These studies report that adsorption of charged dendrimers is due to dendrimer-surface electrostatic interactions and that the adsorbed dendrimers resemble flat disks. The amount of adsorbed dendrimer can be increased by increasing dendrimer generation [17,18] and surface charge density [17,20,21], and can be decreased by increasing salt concentration [17]. Kleijn et al [15] mentioned that along with electrostatic interactions, nonelectrostatic interactions also play an important role in dendrimer adsorption.…”

Section: Introductionmentioning

confidence: 97%

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Brownian dynamics simulations of hydrophobic dendrimer adsorption

Suman

Kumar

2009

Molecular Simulation

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The adsorption of an isolated hydrophobic dendrimer onto a flat surface is studied in this work using Brownian dynamics simulations. The dendrimer is modelled as a freely jointed bead-rod chain. Bead -bead and bead -surface hydrophobic interactions along with excluded-volume interactions are accounted for using a Lennard-Jones potential. Adsorption behaviour is studied as a function of the strength of hydrophobic interactions, dendrimer generation and distribution of hydrophobic groups within the dendrimer. The adsorbed dendrimer adopts a disk-like conformation by compressing in the direction normal to the surface and expanding in the direction parallel to the surface. As the strength of hydrophobicity decreases, the adsorbed dendrimer expands in the normal direction and contracts in the parallel direction. Eventually, at a very low level of hydrophobicity, the dendrimer desorbs and adopts a sphere-like conformation. Bead density profiles show that the adsorbed hydrophobic dendrimer forms a two-layer structure, with one layer corresponding to adsorbed groups, and another layer in free solution, similar to charged dendrimer adsorption. However, unlike charged dendrimer adsorption, all terminal groups can be attached to a surface using a dendrimer having all hydrophobic groups or hydrophobic terminal groups. In the case of a dendrimer having only hydrophobic branching groups, most of the terminal groups can be placed in free solution. Also, an adsorbed hydrophobic dendrimer forms a relatively compact structure unlike the stretched configuration of adsorbed charged dendrimers. The results presented here suggest how to tune the levels of hydrophobicity and charge to tailor dendrimer surface conformations, and may help guide hydrophobic dendrimer design for applications such as drug delivery and surface functionalisation.

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Section: Introductionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 97%

Brownian dynamics simulations of hydrophobic dendrimer adsorption

Suman

Kumar

2009

Molecular Simulation

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“…They found that the generation number of the dendrimer played an important role in formation of heterogeneities of surface charge on the colloids and the charge neutralization mechanism became increasingly superstoichiometric by increasing generation number. In some studies, it was recorded that the adsorbed amount of dendrimer onto oppositely charged surface increased with increasing dendrimer generation [13][14][15][16].…”

Section: Introductionmentioning

confidence: 98%

The adsorption of hyperbranched polymers on silicon oxide surfaces

Ondaral

Wågberg

Enarsson

2006

Journal of Colloid and Interface Science

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“…Electrostatic exclusion of charged dendrimers from similarly charged solid/liquid interface leading to negative adsorption has been proposed in the past to be one of the reasons for the presence of adsorption maximum of cationic dendrimer and similarly charged hematite [1]. In this study, the role of electrostatic exclusion of micelles in determining the surfactant adsorption in the micellar region was investigated using minerals that are charged similarly to the surfactant.…”

Section: Introductionmentioning

confidence: 98%