Time-resolved fluorescence anisotropy studies of the interaction of N-isopropyl acrylamide based polymers with sodium dodecyl sulphate

Chee, Choong Kooi; Rimmer, Stephen; Soutar, Ian; Swanson, Linda

doi:10.1039/c1sm05436h

Cited by 18 publications

(15 citation statements)

References 52 publications

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“…This explains the less pronounced drop of R h with increasing temperature for the PNIPAAMco-PAA system as compared with the PNIPAAM microgels. In addition, the PAA groups are suggested to act as "defects" in the PNIPAAM microgels causing a widening of the collapse region of the microgels [31][32][33][34].…”

Section: Resultsmentioning

confidence: 97%

“…However, even at these low surfactant concentrations, there is a broadening of the transition zone in the presence of surfactant. This wider transition region is even more evident at higher surfactant concentrations; this suggests that the charge density of the microgels is increased and it has been argued that the bound surfactant molecules act as "defects" in the PNIPAAM network [31][32][33][34] . Figure 3a shows that by adding a small amount of the cationic CTAB to PNIPAAM microgels, which are weakly negatively charged, a charge reversal occurs.…”

Section: Pnipaam Microgels With Ctab or Sdsmentioning

confidence: 93%

“…It should be noted that since SDS is negatively charged the charge density increases as SDS is adsorbed to the microgels and the binding is probably mediated through hydrophobic interactions between the surfactant and the polymer. At low concentrations, the surfactants will adsorb to the microgels in its monomeric form [17,34]. At this stage, (≤2 mm SDS or 0.25 mm CTAB), there is almost no change in the R h of the particles compared to the microgels without any surfactant.…”

Section: Pnipaam Microgels With Ctab or Sdsmentioning

confidence: 97%

“…The surfactants bind to the PNIPAAM microgels as single molecules at concentrations below the cac, which usually is lower than the critical micelle concentration (cmc), and at concentrations above cac the surfactant binds in the form of aggregates, in both the swollen and collapsed state of the PNIPAAM microgels [17,34]. It is well-known from the literature that in polymer-surfactant mixtures, CTAB has much lower cmc and cac values than those of SDS [19].…”

Section: Pnipaam Microgels With Ctab or Sdsmentioning

confidence: 99%

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Effects of addition of anionic and cationic surfactants to poly(N-isopropylacrylamide) microgels with and without acrylic acid groups

et al. 2012

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The interaction of the anionic surfactant sodium dodecyl sulfate (SDS) and the cationic surfactant hexadecyl trimethyl ammonium bromide with poly(N-isopropylacrylamide) (PNIPAAM) microgels with and without poly(acrylic acid) (PAA) was investigated by means of dynamic light scattering (DLS), zeta potential, and turbidimetry measurements. The DLS results show that the PNIPAAM microgels with PAA will contract when an anionic or cationic surfactant is added to the suspension, while the PNIPAAM microgels without PAA expand in the presence of an ionic surfactant. A collapse of the PNIPAAM microgels is observed when the temperature is increased. From the zeta potential measurements, it is observed that the charge density of PNIPAAM microgels in the presence of an ionic surfactant is significantly affected by temperature and the attachment of the negatively charged PAA groups. The turbidity measurements clearly indicate that the interaction between PNIPAAM and SDS is more pronounced than that of the cationic surfactant.

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Section: Resultsmentioning

confidence: 97%

Section: Pnipaam Microgels With Ctab or Sdsmentioning

confidence: 93%

Section: Pnipaam Microgels With Ctab or Sdsmentioning

confidence: 97%

Section: Pnipaam Microgels With Ctab or Sdsmentioning

confidence: 99%

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Effects of addition of anionic and cationic surfactants to poly(N-isopropylacrylamide) microgels with and without acrylic acid groups

et al. 2012

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“…PNIPAM hydrogel has a lower critical solution temperature (LCST) in water of around 32°C, which is close to human body temperature, and they are sensitive functions of temperature over the range 15-50°C [2,3]. Particle structure of neutral and charged PNIPAM nanogels have been studied in many researches, and properties of them are known that it can be changed by incorporation of comonomers into PNIPAM matrix.…”

Section: Introductionmentioning

confidence: 99%

Tuning the gel size and LCST of N-isopropylacrylamide nanogels by anionic fluoroprobe

Koç

Alveroğlu

2015

Colloid Polym Sci

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Varying size fluorescent N-isopropylacrylamide (NIPAM) nanogels were synthesized from 140 to 550 nm by precipitation copolymerization. N,N-methylenebisacrylamide (BIS) and ammonium persulfate APS were used as crosslinker and initiator, respectively. 8-Hydroxypyrene-1,3,6-trisulfonic Acid (Pyranine, Py) molecules were used for controlling the particle size and lower critical solution temperature (LCST) of nanogels. NIPAM, BIS and APS amount were kept constant and Py amount changed to tailor the particle size. Fluorescence spectroscopy, atomic force microscopy and light scattering methods show that Py caused smaller size nanogels due to the electrically charged SO − 3 side groups. Additionally, as seen from the light scattering experiment, LCST of nanogels is getting decrease considerably with increasing Py amount. Using of Py for tuning, the gel size and LCST were found very useful, easy and effective way, and it can be used for many biomedical applications.

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Segmental Mobility Studies of Poly(N‐isopropyl acrylamide) Interactions with Gold Nanoparticles and Its Use as a Thermally Driven Trapping System

Swift

Rehman

Surtees

et al. 2018

Macromol. Rapid Commun.

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Thermal desolvation of poly(N-isopropylacrylamide) (PNIPAM) in the presence of a low concentration of gold nanoparticles incorporates the nanoparticles resulting in suspended aggregates. By covalently incorporating <1% acenaphthylene into the polymerization feed this copolymer is enabled to be used as a model to study the segmental mobility of the PNIPAM backbone in response to gold nanoparticles both below and above the desolvation temperature, showing that there is a physical conformational rearrangement of the soluble polymer at ultralow nanoparticle loadings, indicating low affinity interactions with the nanoparticles. Thermal desolvation is capable of extracting >99.9% of the nanoparticles from their solutions and hence demonstrates that poly(N-isopropylacrylamide) can act as an excellent scrubbing system to remove metallic nanomaterial pollutants from solution.

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Time-resolved fluorescence anisotropy studies of the interaction of N-isopropyl acrylamide based polymers with sodium dodecyl sulphate

Cited by 18 publications

References 52 publications

Effects of addition of anionic and cationic surfactants to poly(N-isopropylacrylamide) microgels with and without acrylic acid groups

Effects of addition of anionic and cationic surfactants to poly(N-isopropylacrylamide) microgels with and without acrylic acid groups

Tuning the gel size and LCST of N-isopropylacrylamide nanogels by anionic fluoroprobe

Segmental Mobility Studies of Poly(N‐isopropyl acrylamide) Interactions with Gold Nanoparticles and Its Use as a Thermally Driven Trapping System

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