Fluorescence studies of interactions of ionic surfactants with poly(amidoamine) dendrimers

Bakshi, Mandeep Singh; Kaura, Aman

doi:10.1016/j.jcis.2004.10.062

Cited by 18 publications

(19 citation statements)

References 26 publications

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“…In the past decade, techniques including electrical conductivity, surfactant selective electrode, , surface tension, viscosity, isothermal titration calorimetry (ITC), , atom force microscopy (AFM), fluorescence spectroscopy, − Krafft temperature, electromotive force (EMF), dynamic light scattering (DLS), small angle neutron scattering (SANS), and electron paramagnetic resonance (EPR) were used to investigate the structure of dendrimer−surfactant complexes. Tomalia and Turro reported the presence of noncooperative and cooperative interactions between dendrimers and ionic surfactants.…”

Section: Introductionmentioning

confidence: 99%

New Insights into Interactions between Dendrimers and Surfactants. 4. Fast-Exchange/Slow-Exchange Transitions in the Structure of Dendrimer−Surfactant Aggregates

et al. 2010

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The interactions between poly(amidoamine) (PAMAM) dendrimer and surfactant (sodium dodecyl sulfate, SDS) in aqueous solutions were investigated by a combination of (1)H NMR, diffusion measurements (PFG NMR), and NOE techniques. The diffusion studies suggested that different types of dendrimer-surfactant aggregates are formed by varying surfactant concentrations in the dendrimer solution. The (1)H NMR analysis proved that the presence of fast-exchange/slow-exchange transitions in the dendrimer-surfactant aggregates. The supramolecular structure of the aggregate was based on the hydrophobic interactions between the dendrimer scaffold and the surfactant aliphatic chain, as well as electrostatic/hydrogen-bond interactions between dendrimers and SDS monomers, bilayers, or globular micelles. In comparison with previous investigations, the present study provides a new insight into interactions between dendrimers and surfactants, which may be helpful for the design of dendrimer-based microreactors or nanovehicles.

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Section: Introductionmentioning

confidence: 99%

New Insights into Interactions between Dendrimers and Surfactants. 4. Fast-Exchange/Slow-Exchange Transitions in the Structure of Dendrimer−Surfactant Aggregates

et al. 2010

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“…It is noteworthy that the I 1/ I 3 intensity ratio has for these block copolymers assumes lower values than are usually recorded for block copolymers (at least higher than 116, 17). It is known, however, that low I 1/ I 3 values can be caused both by the presence of very hydrophobic environments, which can determine some pyrene aggregation, influencing also its monomer emission,18 or in the presence of mixed environments, such as hydrophilic dendrimers and surfactants 19. We are incline to ascribe the pyrene behaviour to some peculiarities of its association with compartmentalised environments, since (a) we clearly have complex aggregates (and not simple micelles) and (b) no intense excimer emission was recorded (which is an indication of pyrene self‐aggregation in a hydrophobic environment).…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Properties of Amphiphilic Star Polysulfides

Wang

Kilcher

Tirelli

2007

Macromolecular Bioscience

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We here present the synthesis and characterisation of linear and star-shaped amphiphilic block copolymers based on hydrophobic polysulfides (poly(propylene sulfide), PPS) and hydrophilic polyethers (poly(ethylene glycol), PEG). We also discuss the proof of the principle of their responsiveness to oxidising conditions. In a water environment, these polymers aggregate in the form of sub-micron carriers that, due to the sensitivity to oxidation reactions typical of PPS, can be used for responsive drug delivery. In this first study we have focused on the study of large aggregates, which do not apparently show dramatic differences in behaviour when polymer chains with different degrees of branching are studied.

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“…However, the absence of any ordered morphology of gold nanoparticles in the presence of DTAB can be attributed to weak DTAB-dendrimer interactions. [29][30][31][32] Hence, it seems that dendrimer-surfactant interactions significantly influence the nanoparticle formation with the result of which aggregated morphologies of nanoparticles are being influenced. Solution properties of dendrimer-surfactant interactions demonstrated that anionic surfactants like SDS has maximum interactions with the dendritic balls, followed by nonionic, and then by cationic.…”

Section: Discussionmentioning

confidence: 99%

Effect of Sodium dodecylsulfate and Dodecyltrimethyl Ammonium Bromide on the Morphologies of Gold Nanoparticles in the Presence of Poly(amidoamine) Dendrimers

Bakshi¹,

Kaura²,

Kaur³

et al. 2006

j nanosci nanotechnol

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The synthesis of gold nanoparticles has been carried out in aqueous phase in the presence of both ionic surfactants (i.e., sodium dodecylsulfate (SDS) and dodecyltrimethylammonium bromide (DTAB)) and poly(amidoamine) dendrimers (PAMAM). It has been observed that the fluoroderivative of 2G PAMAM (2D) acts as reducing agent in reducing Au(lll) to Au(0) leading to the formation of fine gold nanoparticles. This process has been further evaluated in the presence of fixed amounts of both SDS and DTAB in their respective pre and post micellar concentration regions. The presence of SDS leads to the appearance of clear ordered morphologies such as triangular, hexagonal, spherical, and rod shaped, while the presence of DTAB does not show this effect. The formation of nanoparticles in triangular morphologies is more significant in the premicellar concentration range of SDS whereas hexagonal morphologies in the post micellar concentration range. On the contrary, increase in the DTAB concentration from pre to post micellar range only reduces the size of gold nanoparticles without the appearance of any ordered morphology. The formation of ordered gold nanoparticles in the presence of SDS has been further attributed to the significant SDS-dendrimer interactions and an appropriate mechanism has been proposed to justify the results.

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Fluorescence studies of interactions of ionic surfactants with poly(amidoamine) dendrimers

Cited by 18 publications

References 26 publications

New Insights into Interactions between Dendrimers and Surfactants. 4. Fast-Exchange/Slow-Exchange Transitions in the Structure of Dendrimer−Surfactant Aggregates

New Insights into Interactions between Dendrimers and Surfactants. 4. Fast-Exchange/Slow-Exchange Transitions in the Structure of Dendrimer−Surfactant Aggregates

Synthesis and Properties of Amphiphilic Star Polysulfides

Effect of Sodium dodecylsulfate and Dodecyltrimethyl Ammonium Bromide on the Morphologies of Gold Nanoparticles in the Presence of Poly(amidoamine) Dendrimers

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