Colloidal crystals made of poly(N-isopropylacrylamide) microgel particles

Hellweg, Thomas; Dewhurst, C. D.; Bruckner, Eric J.; Kratz, Karl; Eimer, Wolfgang

doi:10.1007/s003960000350

Cited by 202 publications

(167 citation statements)

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“…[68,69] In addition to these properties, microgels have other characteristics of colloidal dispersions, such as zeta potentials, [69][70][71] and can also form ordered colloidal phases. [72][73][74][75] Some very important studies have focused on the differences between macro-and microgels with respect to their phase behavior. For example, Wu et al have shown that the VPTT of the microgels is slightly higher than the LCST of pNIPAm (Figure 6), and also that the transition region is less sharp than that of bulk gels.…”

Section: Microgels and Nanogelsmentioning

confidence: 99%

Soft Nanotechnology with Soft Nanoparticles

2005

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The last decade of research in the physical sciences has seen a dramatic increase in the study of nanoscale materials. Today, "nanoscience" has emerged as a multidisciplinary effort, wherein obtaining a fundamental understanding of the optical, electrical, magnetic, and mechanical properties of nanostructures promises to deliver the next generation of functional materials for a wide range of applications. While this range of efforts is extremely broad, much of the work has focused on "hard" materials, such as Buckyballs, carbon nanotubes, metals, semiconductors, and organic or inorganic dielectrics. Meanwhile, the soft materials of current interest typically include conducting or emissive polymers for "plastic electronics" applications. Despite the continued interest in these established areas of nanoscience, new classes of soft nanomaterials are being developed from more traditional polymeric constructs. Specifically, nanostructured hydrogels are emerging as a promising group of materials for multiple biotechnology applications as the need for advanced materials in the post-genomic era grows. This review will present some of the recent advances in the marriage between water-swellable networks and nanoscience.

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Section: Microgels and Nanogelsmentioning

confidence: 99%

Soft Nanotechnology with Soft Nanoparticles

2005

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“…Further on, the stimuli responsive behaviour of PNIPAM-based materials makes them interesting for coatings [6,7]. The ability of PNIPAM-based microgels to form well-organized structures at solid surfaces has been previously reported [8][9][10][11][12]. Schmidt et al [8] demonstrated that pure PNIPAM microgel particles and particles containing acrylic acid as co-monomer form well-organized structures at solid surfaces.…”

Section: Introductionmentioning

confidence: 95%

The Effect of Co-Monomer Content on the Swelling/Shrinking and Mechanical Behaviour of Individually Adsorbed PNIPAM Microgel Particles

et al. 2011

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Abstract:The swelling/deswelling behaviour of microgel particles in the bulk and at the surface was studied and correlated to their mechanical properties. We focused on two kinds of particles: pure PNIPAM and PNIPAM-co-AAc particles. It was shown that the two step volume phase transition found for PNIPAM-co-AAc particles in the bulk disappears after the adsorption at the surface and only a one step transition was identified. The transition temperature increased strongly with increasing the co-monomer content. The dependence of the Young's modulus of the adsorbed microgel particles on the temperature and the co-monomer content was discussed. The investigations were performed via DLS and SFM.

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“…Furthermore, the crystal is found only for sufficiently charged particles such that the charge repulsion between the particles is strong enough to give rise to structural order. To date, however, in experiments only fcc or rhcp order has been found in neutral and charged microgel suspensions [147][148][149].…”

Section: Soft Particlesmentioning

confidence: 99%

Crystallization in three- and two-dimensional colloidal suspensions

Gasser

2009

J. Phys.: Condens. Matter

236

242

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Despite progress in the understanding of crystal nucleation and crystal growth since the first theories for nucleation were developed, an exact quantitative prediction of the nucleation rates in most systems has remained an unsolved problem. Colloidal suspensions show a phase behavior that is analogous to atomic or molecular systems and serve accordingly as ideal model systems for studying crystal nucleation with an accuracy and depth on a microscopic scale that is hard to reach for atomic or molecular systems. Due to the mesoscopic size of colloidal particles they can be studied in detail on the single-particle level and their dynamics is strongly slowed down in comparison with atomic or molecular systems, such that the formation of a crystal nucleus can be followed in detail. In this review, recent progress in the study of homogeneous and heterogeneous crystal nucleation in colloids and the controlled growth of crystalline colloidal structures is reviewed. All this work has resulted in unprecedented insights into the early stage of nucleation and it is also relevant for a deeper understanding of soft matter materials in general as well as for possible applications based on colloidal suspensions.

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Colloidal crystals made of poly(N-isopropylacrylamide) microgel particles

Cited by 202 publications

References 0 publications

Soft Nanotechnology with Soft Nanoparticles

Soft Nanotechnology with Soft Nanoparticles

The Effect of Co-Monomer Content on the Swelling/Shrinking and Mechanical Behaviour of Individually Adsorbed PNIPAM Microgel Particles

Crystallization in three- and two-dimensional colloidal suspensions

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