scholarly journals Multicompartmental Mesoporous Silica/Polymer Nanostructured Hybrids: Design Capabilities by Integrating Linear and Star-Shaped Block Copolymers

Polymers ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 51
Author(s):  
Zacharoula Iatridi ◽  
Kyriaki Evangelatou ◽  
Nikolaos Theodorakis ◽  
Athina Angelopoulou ◽  
Konstantinos Avgoustakis ◽  
...  
Keyword(s):  
Mesoporous Silica ◽  
Ethylene Oxide ◽  
Chemical Species ◽  
Multiple Drug ◽  
Layer By Layer ◽  
Hydrophobic Chemical ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Theranostic Applications ◽  
Multiple Drug Delivery

Poly(2-vinyl pyridine)-b-poly(ethylene oxide) (P2VP-b-PEO) linear diblock copolymer and polystyrene–poly(ethylene oxide) (PS10PEO10) heteroarm star copolymer were used as building elements to prepare organic–inorganic hybrids. By using the layer-by-layer (LbL) methodology, these elements were integrated on mesoporous silica through non-covalent interactions, namely, ionic and H-bonding. For the latter, tannic acid (TA) was used as an intermediate layer. The deposition of the various layers was monitored by thermogravimetric analysis (TGA), electrophoretic measurements, and confocal microscopy. The final silica hybrid, bearing alternating P2VP-b-PEO and PS10PEO10 star layers was capable of carrying one hydrophilic and two hydrophobic chemical species in distinct compartments. These multicompartmental organic–inorganic hybrids could be used as nanostructured carriers for pH-responsive multiple drug delivery and potential theranostic applications.

Preparation of Organized Mesoporous Silica from Sodium Metasilicate Solutions in Alkaline Medium Using Nonionic Surfactants

2003 ◽  
Vol 68 (10) ◽  
pp. 2019-2031 ◽  
Author(s):  
Markéta Zukalová ◽  
Jiří Rathouský ◽  
Arnošt Zukal
Keyword(s):  
Mesoporous Silica ◽  
Ethylene Oxide ◽  
Sodium Metasilicate ◽  
Spherical Particles ◽  
Structure Directing Agent ◽  
Inorganic Species ◽  
Poly Ethylene Oxide ◽  
Acidic Conditions ◽  
Poly Ethylene ◽  
Hydrolysis Of

A new procedure has been developed, which is based on homogeneous precipitation of organized mesoporous silica from an aqueous solution of sodium metasilicate and a nonionic poly(ethylene oxide) surfactant serving as a structure-directing agent. The decrease in pH, which induces the polycondensation of silica, is achieved by hydrolysis of ethyl acetate. Owing to the complexation of Na+ cations by poly(ethylene oxide) segments, assembling of the mesostructure appears to occur under electrostatic control by the S0Na+I- pathway, where S0 and I- are surfactant and inorganic species, respectively. As the complexation of Na+ cations causes extended conformation of poly(ethylene oxide) segments, the pore size and pore volume of organized mesoporous silica increase in comparison with materials prepared under neutral or acidic conditions. The assembling of particles can be fully separated from their solidification, which results in the formation of highly regular spherical particles of mesoporous silica.

Interpolymer complexes of poly(sulfonic acid)s and poly(ethylene oxide): an unexpected association

Soft Matter ◽  
2019 ◽  
Vol 15 (45) ◽  
pp. 9318-9324
Author(s):  
Liliana Maldonado ◽  
Gabriel Debais ◽  
Federico Davia ◽  
Lucila P. Méndez De Leo ◽  
Mario Tagliazucchi
Keyword(s):  
Aqueous Solution ◽  
Ethylene Oxide ◽  
Sulfonic Acid ◽  
Layer By Layer ◽  
Interpolymer Complexes ◽  
Layer Deposition ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene ◽  
Hydrogen Bonded

Poly(sulfonic acid)s and poly(ethylene oxide) unexpectedly form novel hydrogen-bonded interpolymer complexes in aqueous solution and on surfaces by layer-by-layer deposition.

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