Bowl-Shaped Aggregates from the Self-Assembly of an Amphiphilic Random Copolymer of Poly(styrene-<i>co</i>-methacrylic acid)

Liu, Xiaoya; Kim, Joon‐Seop; Wu, Jun; Eisenberg, Adi

doi:10.1021/ma050665r

Cited by 155 publications

(159 citation statements)

References 18 publications

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“…Furthermore, Giant, Li et al reported that some amphiphilic random copolymers were able to self-assemble into nanoparticles as well [20,21]. Our previous works also investigated the self-assembled and cross-linked nanoparticles of random or alternating copolymers [22][23][24][25]. However, although these fascinating and inexpensive polymer nanoparticles offer a more practical possibility for Pickering emulsions, to the best of our knowledge, no attempt has been reported so far.…”

Section: Introductionmentioning

confidence: 98%

Pickering emulsions stabilized by self-assembled colloidal particles of copolymers of P(St-alt-MAn)-co-P(VM-alt-MAn)

Liu

Zhu

et al. 2010

Journal of Colloid and Interface Science

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Section: Introductionmentioning

confidence: 98%

Pickering emulsions stabilized by self-assembled colloidal particles of copolymers of P(St-alt-MAn)-co-P(VM-alt-MAn)

Liu

Zhu

et al. 2010

Journal of Colloid and Interface Science

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“…Moreover, their sizes were controllable by the various compositions. [12,13] Therefore, we believe that random copolymers with functionalities and various compositions are available to form ordered nanoscaled aggregations. On the other hand, polymeric particles could be stabilized by crosslinking the shell or core through photo-reactions or chemical reactions to improve stability and to keep encapsulated guest molecules trapped inside.…”

Section: Introductionmentioning

confidence: 99%

Studies on Preparation and Fluorescent Properties of a Novel Photo‐Sensitive Nanoparticle Composed of Europium Ion and Cinnamic Acid Derivative

Shi

Liu

Xiang

et al. 2009

Macro Chemistry & Physics

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A novel fluorescent and photo‐sensitive nanoparticle was self‐assembled from an europium‐based random copolymer, europium coordinated poly(methylacrylic acid)‐co‐poly(cinnamyl acrylate) (PMCFA‐Eu3+), which was synthesized from methylacrylic acid (MAA), and Eu3+‐cinnamyl acrylate derivative (CFA) by radical polymerization. DLS and TEM results indicated the formation of spherical nanoparticles with 120 nm in diameter. The PMCFA‐Eu3+ complex showed stronger fluorescence than Eu3+, indicating the effective energy transferred from the ligand to Eu3+. Moreover, the photo‐crosslinking of the cinnamate groups induced a decrease in the diameter and an increase in the fluorescent properties of the PMCFA‐Eu3+ nanoparticles. This functional nanoparticle might be useful as a carrier and a fluorescence probe in biomedical and fluorescent fields.magnified image

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“…2,3 These studies reported nanoscale to microscale morphologies such as spherical or cylindrical micelles, vesicles, ribbons, fibers, bowls, and toroids. [4][5][6][7][8][9] Of particular interest are stimuli-responsive materials that allow for the directed or modulated self-assembly on the nanoscale in aqueous solution. Materials with stimuli-responsive physical properties have potential uses in food, cosmetics, and drug delivery applications.…”

Section: Introductionmentioning

confidence: 99%

Supramolecular Self-Assembly of Multiblock Copolymers in Aqueous Solution

et al. 2006

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A unique pH-dependent phase behavior from a copolytner micellar solution to a collapsed hydrogel with micelles ordered in a hexagonal phase was observed. Small-angle neutron scattering (SANS) was used to follow the pH-dependent structural evolution of micelles formed in a solution of a pentablock copolymer consisting of poly((diethylaminoethyl methacrylate)-b-(ethylene oxide)-b-(propylene oxide)-b-(ethylene oxide)-b-(diethylaminoethyl methacrylate)) (PDEAEM 25-b-PEO 100-b-PPO 65-b-PEO 100-b-PDEAEM 25). Between pH 3.0 and pH 7.4, we observed the presence of charged spherical micelles. Increasing the pH of the micelle solution above pH 7.4 resulted in increasing the size of the micelles due to the increasing hydrophobicity of the PDEAEM blocks above their pK a of 7.6. The increase in size of the spherical micelles resulted in a transition to a cylindrical micelle morphology in the pH range 8.1-10.5, and at pH > 11, the copolymer solution undergoes macroscopic phase separation. Indeed, the phase separated copolymer sediments and coalesces into a hydrogel structure that consists of 25-35 wt% water. Small-angle X-ray scattering (SAXS) clearly indicated that the hydrogel has a hexagonal ordered phase. Interestingly, the process is reversible, as lowering of the pH below 7.0 leads to rapid dissolution of the solid into homogeneous solution. We believe that the hexagonal structure in the hydrogel is a result of the organization of the cylindrical micelles due to the increased hydrophobic interactions between the micelles at 70Â°C and pH 11. Thus we have developed a pH-/ temperature-dependent, reversible hierarchically self-assembling block copolymer system with structures spanning nano-to microscale dimensions. KeywordsAmes Laboratory, copolymer sediments, small-angle neutron scattering, micelles, pH effects, phase separation, self assembly, supramolecular chemistry, block copolymers Disciplines Biochemical and Biomolecular Engineering | Chemical Engineering | Polymer Science CommentsReprinted (adapted) with permission from Langmuir, 22 (4) A unique pH-dependent phase behavior from a copolymer micellar solution to a collapsed hydrogel with micelles ordered in a hexagonal phase was observed. Small-angle neutron scattering (SANS) was used to follow the pHdependent structural evolution of micelles formed in a solution of a pentablock copolymer consisting of poly((diethylaminoethyl methacrylate)-b-(ethylene oxide)-b-(propylene oxide)-b-(ethylene oxide)-b-(diethylaminoethyl methacrylate)) (PDEAEM 25 -b-PEO 100 -b-PPO 65 -b-PEO 100 -b-PDEAEM 25 ). Between pH 3.0 and pH 7.4, we observed the presence of charged spherical micelles. Increasing the pH of the micelle solution above pH 7.4 resulted in increasing the size of the micelles due to the increasing hydrophobicity of the PDEAEM blocks above their pK a of 7.6. The increase in size of the spherical micelles resulted in a transition to a cylindrical micelle morphology in the pH range 8.1-10.5, and at pH >11, the copolymer solution undergoes macroscopic phase separation...

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Bowl-Shaped Aggregates from the Self-Assembly of an Amphiphilic Random Copolymer of Poly(styrene-co-methacrylic acid)

Cited by 155 publications

References 18 publications

Pickering emulsions stabilized by self-assembled colloidal particles of copolymers of P(St-alt-MAn)-co-P(VM-alt-MAn)

Pickering emulsions stabilized by self-assembled colloidal particles of copolymers of P(St-alt-MAn)-co-P(VM-alt-MAn)

Studies on Preparation and Fluorescent Properties of a Novel Photo‐Sensitive Nanoparticle Composed of Europium Ion and Cinnamic Acid Derivative

Supramolecular Self-Assembly of Multiblock Copolymers in Aqueous Solution

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