Core–Shell Particles

Musyanovych, Anna; Landfester, Katharina

doi:10.1002/9783527631421.ch29

Cited by 11 publications

(11 citation statements)

References 157 publications

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“…More recently, the interest shifted toward structured nanoparticles that have a nano-sized regular arrangement within each sphere, which can be comprised of two different polymers or can alternatively be a composite material. These structures can be distinguished as thermodynamic or kinetic morphologies [5] and range from simple core-shell to onions to plum pudding and a range of other structures ( Figure 1). …”

Section: Introductionmentioning

confidence: 99%

“…Core-shell particles can either have a dense outer layer or are hairy particles depending on the technique and the conditions employed. Excellent reviews on the subject of core-shell particles were prepared by Musyanovych and Landfester [5] and by Fellows [6] and the reader is referred to these articles for an in-depth insight. This paper will highlight how the reversible addition fragmentation chain transfer (RAFT) process can enhance the synthesis of core-shell particles.…”

Section: Introductionmentioning

confidence: 99%

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Hairy Core–Shell Nanoparticles via RAFT: Where are the Opportunities and Where are the Problems and Challenges?

Stenzel

2009

Macromol. Rapid Commun.

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The preparation of hairy core-shell nanoparticles including (crosslinked) micelles, unimolecular micelles such as star polymers with block structures in each arm and surface grafted nanoparticles such as inorganic particles via the RAFT process are discussed. The RAFT process is certainly a highly versatile process. However, it should not be forgotten that RAFT polymerization is a process, i.e., superimposed on a conventional free radical process. Furthermore, the livingness of the process is dependent on the accessibility of the RAFT group, which can be hampered in certain approaches such as star synthesis and surface grafting from nanoparticles. Nevertheless, the RAFT process is a versatile toolbox that offers good solutions to a range of problems in the preparation of hairy nanoparticles.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Hairy Core–Shell Nanoparticles via RAFT: Where are the Opportunities and Where are the Problems and Challenges?

Stenzel

2009

Macromol. Rapid Commun.

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“…Regardless of the synthetic pathway, block copolymer nanoparticles have attracted much attention for a diverse range of applications [5] including therapeutics delivery [6,7], imaging contrast agents [8], nanostructured films [9], stimuli-responsive nanomaterials [10,11], and the templating of inorganic materials [12,13]. Crucial for many applications is the core-shell architecture in which the inner region-mainly composed of the lyophobic blocks of the amphiphile-is surrounded by a brush-like corona rich in lyophilic blocks [14]. Various examples have shown a strong link between core-shell morphology and nanoparticles' properties.…”

Section: Introductionmentioning

confidence: 99%

Characterizing the Core-Shell Architecture of Block Copolymer Nanoparticles with Electron Microscopy: A Multi-Technique Approach

et al. 2020

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Electron microscopy has proved to be a major tool to study the structure of self-assembled amphiphilic block copolymer particles. These specimens, like supramolecular biological structures, are problematic for electron microscopy because of their poor capacity to scatter electrons and their susceptibility to radiation damage and dehydration. Sub-50 nm core-shell spherical particles made up of poly(hydroxyethyl acrylate)–b–poly(styrene) are prepared via polymerization-induced self-assembly (PISA). For their morphological characterization, we discuss the advantages, limitations, and artefacts of TEM with or without staining, cryo-TEM, and SEM. A number of technical points are addressed such as precisely shaping of particle boundaries, resolving the particle shell, differentiating particle core and shell, and the effect of sample drying and staining. TEM without staining and cryo-TEM largely evaluate the core diameter. Negative staining TEM is more efficient than positive staining TEM to preserve native structure and to visualize the entire particle volume. However, no technique allows for a satisfactory imaging of both core and shell regions. The presence of long protruding chains is manifested by patched structure in cryo-TEM and a significant edge effect in SEM. This manuscript provides a basis for polymer chemists to develop their own specimen preparations and to tackle the interpretation of challenging systems.

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“…29,30 In particular, PISA has proven successful to create sub-50 nm nanoparticles with a core-shell morphology. 31,32 In addition to having a suitable diameter range and size distribution, our diblock copolymer nanoparticles do not require additional surfactant since stabilization is ensured by PHEA chains. Unlike electrostatic stabilization, such steric stabilization leads to a more robust template able to disperse in various organic monomer solutions.…”

Section: Introductionmentioning

confidence: 99%

Diblock Copolymer Core–Shell Nanoparticles as Template for Mesoporous Carbons: Independent Tuning of Pore Size and Pore Wall Thickness

et al. 2019

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Latex templating using core-shell particles represents a unique opportunity to design mesoporous carbons with a high level of control on textural properties. This new class of organic colloid templates is synthesized by polymerization-induced self-assembly (PISA) in which a solvophilic poly(hydroxyethyl acrylate) (PHEA) homopolymer is chain extended with a solvophobic polystyrene (PS) via a photomediated reversible-addition fragmentation-transfer (RAFT) polymerization. The resultant PHEA-b-PS diblock copolymer nanoparticles exhibit a PS core stabilized by a PHEA shell, with two blocks characterized by a low molecular weight

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Core–Shell Particles

Cited by 11 publications

References 157 publications

Hairy Core–Shell Nanoparticles via RAFT: Where are the Opportunities and Where are the Problems and Challenges?

Hairy Core–Shell Nanoparticles via RAFT: Where are the Opportunities and Where are the Problems and Challenges?

Characterizing the Core-Shell Architecture of Block Copolymer Nanoparticles with Electron Microscopy: A Multi-Technique Approach

Diblock Copolymer Core–Shell Nanoparticles as Template for Mesoporous Carbons: Independent Tuning of Pore Size and Pore Wall Thickness

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