pH-Responsive Hollow Polymeric Microspheres and Concentric Hollow Silica Microspheres from Silica−Polymer Core−Shell Microspheres

Li, Guoliang; Liu, Gang; Kang, En‐Tang; Neoh, K. G.; Yang, Xinlin

doi:10.1021/la8010579

Cited by 121 publications

(82 citation statements)

References 29 publications

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“…The absorption peaks at 1567 cm −1 are associated with the characteristic secondary amide stretching vibration of the PNIPAM brushes. [32] The almost complete disappearance of peaks of C＝C stretching vibration absorption at 1629 cm −1 indicates that most of the C＝C bonds have been hydrothiolated. The residual C＝C bonds are embedded in the imprinted shell, and are inaccessible to the thiol-ene click reaction.…”

Section: Resultsmentioning

confidence: 99%

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Preparation of Thermosensitive Hollow Imprinted Microspheres via Combining Distillation Precipitation Polymerization and Thiol‐ene Click Chemistry

Guo

Wang

Shan³

2014

Chin. J. Chem.

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Hollow molecular imprinted polymer microspheres were prepared by distillation precipitation polymerization with (S)-(＋)-ibuprofen (S-IBF) as template molecule and acrylamide (AM) as functional monomer. Using the silicon dioxide (SiO 2 , 180 nm) modified by 3-(trimethoxysilyl)propyl methacrylate (MPS) as the template microspheres, the molecular imprinted shells were coated on successfully (SiO 2 @MIPs). The thermosensitive SiO 2 @MIPs-PNIPAM core-shell microspheres were subsequently prepared by grafting the PNIPAM chains (M n ＝ 1.21×10 4 g/mol, polydispersity index＝1.30), which were prepared by reversible addition-fragmentation chain transfer (RAFT) polymerization, on the surface of SiO 2 @MIPs microspheres via the thiol-ene click chemistry. The grafting density of PNIPAM brushes on the SiO 2 @MIPs microspheres was about 0.18 chains/nm 2 . After HF etching, the hollow imprinted microspheres were finally obtained. For thermosensitivity analysis, the phase transition temperatures of multifunctional nanoparticles were measured by DSL at 25 and 45 ℃ respectively, ℃ and the sizes of the microspheres changed by about 35 nm. The modified microspheres presented excellent controlled release property to S-IBF, moreover about half amount of the adsorptions passed into acetonitrile-water solution through the specific holes of imprinted shell at 25 ℃ under vibration.

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Section: Resultsmentioning

confidence: 99%

“…The absorption peak at 1631 cm −1 is attributable to the stretching vibration of vinyl groups on the SiO 2 -MPS surfaces. [32] These carbon-carbon double bonds (C＝C) will serve as initiation and anchoring sites for the subsequent surface-initiated radical polymerization for the preparation of SiO 2 @M/NIPs core-shell microspheres.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Thermosensitive Hollow Imprinted Microspheres via Combining Distillation Precipitation Polymerization and Thiol‐ene Click Chemistry

Guo

Wang

Shan³

2014

Chin. J. Chem.

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“…Frequently this is a colloid of polymeric nanoparticles that function as the core, such as polystyrene [48,49] or other polymers including poly(methylacrylic acid) [50] and poly(methyl methylacrylate) [51,52]. For dual-templating MSNs, polystyrene latex has been a widespread choice due to its homogeneous synthesis, commercial availability, nanoscale diameter, and thermal degradability during calcination [53].…”

Section: Secondary Templatesmentioning

confidence: 99%

Template-based syntheses for shape controlled nanostructures

Pérez-Page

et al. 2016

Advances in Colloid and Interface Science

138

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A variety of nanostructured materials are produced through template-based synthesis methods, including zerodimensional, one-dimensional, and two-dimensional structures. These span different forms such as nanoparticles, nanowires, nanotubes, nanoflakes, and nanosheets. Many physical characteristics of these materials such as the shape and size can be finely controlled through template selection and as a result, their properties as well. Reviewed here are several examples of these nanomaterials, with emphasis specifically on the templates and synthesis routes used to produce the final nanostructures. In the first section, the templates have been discussed while in the second section, their corresponding synthesis methods have been briefly reviewed, and lastly in the third section, applications of the materials themselves are highlighted. Some examples of the templates frequently encountered are organic structure directing agents, surfactants, polymers, carbon frameworks, colloidal sol-gels, inorganic frameworks, and nanoporous membranes. Synthesis methods that adopt these templates include emulsion-based routes and template-filling approaches, such as self-assembly, electrodeposition, electroless deposition, vapor deposition, and other methods including layer-by-layer and lithography. Templatebased synthesized nanomaterials are frequently encountered in select fields such as solar energy, thermoelectric materials, catalysis, biomedical applications, and magnetowetting of surfaces.

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“…Hence, this work explored the attainable maximum power density of single fuel cell loaded with a HPS-Nafion composite membrane and its structural origins. HPS (100-200 nm) were synthesized through a three-step procedure as illustrated in Scheme 1, which is similar to the literature method [25]. Two types of hydrophilic HPS, with poly (sulfonated styrene-divinylbenzene) shell (s-HPS) and poly (methacrylic acid-divinylbenzene) shell (c-HPS), respectively, were obtained from this preparation.…”

Section: Introductionmentioning

confidence: 99%

Embedding of Hollow Polymer Microspheres with Hydrophilic Shell in Nafion Matrix as Proton and Water Micro-Reservoir

et al. 2012

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Assimilating hydrophilic hollow polymer spheres (HPS) into Nafion matrix by a loading of 0.5 wt % led to a restructured hydrophilic channel, composed of the pendant sulfonic acid groups (-SO 3 H) and the imbedded hydrophilic hollow spheres. The tiny hydrophilic hollow chamber was critical to retaining moisture and facilitating proton transfer in the composite membranes. To obtain such a tiny cavity structure, the synthesis included selective generation of a hydrophilic polymer shell on silica microsphere template and the subsequent removal of the template by etching. The hydrophilic HPS (100-200 nm) possessed two different spherical shells, the styrenic network with pendant sulfonic acid groups and with methacrylic acid groups, respectively. By behaving as microreservoirs of water, the hydrophilic HPS promoted the Grotthus mechanism and, hence, enhanced proton transport efficiency through the inter-sphere path. In addition, the HPS with the -SO 3 H borne shell played a more effective role than those with the -CO 2 H borne shell in augmenting proton transport, in particular under low humidity or at medium temperatures. Single H 2 -PEMFC test at 70 °C using dry H 2 /O 2 further verified the impactful role of hydrophilic HPS in sustaining higher proton flux as compared to pristine Nafion membrane.

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pH-Responsive Hollow Polymeric Microspheres and Concentric Hollow Silica Microspheres from Silica−Polymer Core−Shell Microspheres

Cited by 121 publications

References 29 publications

Preparation of Thermosensitive Hollow Imprinted Microspheres via Combining Distillation Precipitation Polymerization and Thiol‐ene Click Chemistry

Preparation of Thermosensitive Hollow Imprinted Microspheres via Combining Distillation Precipitation Polymerization and Thiol‐ene Click Chemistry

Template-based syntheses for shape controlled nanostructures

Embedding of Hollow Polymer Microspheres with Hydrophilic Shell in Nafion Matrix as Proton and Water Micro-Reservoir

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