Stimuli‐Responsive Reversible Transport of Nanoparticles Across Water/Oil Interfaces

Edwards, Erik W.; Chanana, Munish; Wang, Dayang; Möhwald, Helmuth

doi:10.1002/anie.200702597

Cited by 130 publications

(114 citation statements)

References 33 publications

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“…[ 76 ] Comparable results were afterwards reported by Wang and co-workers with OEGMA-modifi ed gold particles (Figure 2 ). [ 77 ] In this work, disulfi de-functionalized P(MEO 2 MAco -OEGMA 475 ) were used to stabilize gold nanoparticles prepared via a one-step reduction process. The modifi ed colloids exhibited a marked thermoresponsive behavior, which enabled aqueous-organic phase transfer.…”

Section: Hydrogels and Microgelsmentioning

confidence: 99%

Thermo‐Switchable Materials Prepared Using the OEGMA‐Platform

2011

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We describe here the advantages of oligo(ethylene glycol)‐based (co)polymers for preparing thermoresponsive materials as diverse as polymer‐enzyme bio‐hybrids, injectable hydrogels, capsules for drug‐release, modified magnetic particles for in vivo utilization, cell‐culture substrates, antibacterial surfaces, or stationary phases for bioseparation. Oligo(ethylene glycol) methacrylates (OEGMAs) can be (co)polymerized using versatile and widely‐applicable methods of polymerization such as atom transfer radical polymerization (ATRP) of reversible addition‐fragmentation chain‐transfer (RAFT) polymerization. Thus, the molecular structure and therefore the stimuli‐responsive properties of these polymers can be precisely controlled. Moreover, these stimuli‐responsive macromolecules can be easily attached to–or directly grown from–organic, inorganic or biological materials. As a consequence, the OEGMA synthetic platform is today a popular option for materials design. The present research news summaries the progress of the last two years.

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Section: Hydrogels and Microgelsmentioning

confidence: 99%

Thermo‐Switchable Materials Prepared Using the OEGMA‐Platform

2011

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“…[ 14 , 15 ] Edwards et al, for example, demonstrated that increasing the solution temperature of PPEGMA coated gold nanoparticles above the LCST of the polymer triggers (reversible) transport of the nanoparticles across an oil/water interface. [ 16 ] Boyer et al have coated 20 nm gold nanoparticles with copoly(oligo ethylene glycol)acrylates with solution LCSTs between 15 and 92 ° C and demonstrated that the thermoresponsive properties of the polymer-gold hybrids can be tuned by tuning the composition of the polymer coating. [ 17 ] Tenhu and coworkers have studied the effect of polymer molecular weight and gold core size on the thermoresponsive properties of PNIPAM coated gold nanoparticles with gold core sizes ranging from 2-4.1 nm and PNIPAM degrees of polymerization between 3 and 28.…”

Section: Doi: 101002/adma201001382mentioning

confidence: 99%

Size‐Dependent LCST Transitions of Polymer‐Coated Gold Nanoparticles: Cooperative Aggregation and Surface Assembly

2010

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“…The polymer chains exhibit temperature-dependent solvation behaviour in which they become less solvated with increasing temperature. This results in a thermo-responsive behaviour leading to applications in the areas of biointerfaces, [1][2][3][4][5][6] drug delivery systems, [7][8][9][10][11] permeation-controlled filters, [12] and functional composite surfaces. [13][14][15] In addition to bulk applications, pNIPAM films can be attached to a solid support by methods including atom transfer radical polymerization (ATRP), [16][17][18] initiated either by UV light [19] or by electron beam radiation.…”

Section: Introductionmentioning

confidence: 99%

In Situ Characterization of Thermo‐Responsive Poly(N‐Isopropylacrylamide) Films with Sum‐Frequency Generation Spectroscopy

2010

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The thermo-responsive behaviour of thiol modified poly(N-isopropylacrylamide) (pNIPAM) films immobilized on gold are probed by in situ broadband sum-frequency generation (SFG) spectroscopy. The pNIPAM films were prepared by atom transfer radical polymerization (ATRP) using a nitro-biphenyl-thiol (NBT)-SAM on a polycrystalline gold surface as a substrate. Additionally, Raman and infrared reflection absorption spectroscopy (IRRAS) are applied to spin-coated pNIPAM films. Molecular groups involved in the reorientation and disordering of the polymer chains during the LCST (lower critical solution temperature) transition of pNIPAM are identified. The characteristic vibrations of the CH(3) groups show a gradual reorientation of the isopropyl groups within the pNIPAM film and instantaneous reorientation of the outermost CH(3) groups around 32 degrees C.

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Stimuli‐Responsive Reversible Transport of Nanoparticles Across Water/Oil Interfaces

Cited by 130 publications

References 33 publications

Thermo‐Switchable Materials Prepared Using the OEGMA‐Platform

Thermo‐Switchable Materials Prepared Using the OEGMA‐Platform

Size‐Dependent LCST Transitions of Polymer‐Coated Gold Nanoparticles: Cooperative Aggregation and Surface Assembly

In Situ Characterization of Thermo‐Responsive Poly(N‐Isopropylacrylamide) Films with Sum‐Frequency Generation Spectroscopy

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