The Decomposition Process of Melamine Formaldehyde Cores: The Key Step in the Fabrication of Ultrathin Polyelectrolyte Multilayer Capsules

Gao, Changyou; Moya, Sergio; Lichtenfeld, Heinz; Casoli, Alain; Fiedler, H.; Donath, Edwin; Möhwald, Helmuth

doi:10.1002/1439-2054(20010601)286:6<355::aid-mame355>3.3.co;2-0

Cited by 73 publications

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“…335 This reversible pH‐permeability relationship of the capsules may strongly depend on the core particle used for the PEM deposition: when melamin‐formaldhehyde is used as a core material, it dissolution induces the release of polymer which stays in the capsule wall and which modifies its permeability. 336 Many capsules display swelling behavior as a function of pH changes 337, 338, this swelling being important at a pH value just before the onset of capsule rupture. 339 Note that hollow polyelectrolyte capsules are intrinsically semi permeable membranes, i.e.…”

Section: Stimuli Responsive Lbl Filmsmentioning

confidence: 99%

Dynamic Aspects of Films Prepared by a Sequential Deposition of Species: Perspectives for Smart and Responsive Materials

et al. 2011

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The deposition of surface coatings using a step-by-step approach from mutually interacting species allows the fabrication of so called "multilayered films". These coatings are very versatile and easy to produce in environmentally friendly conditions, mostly from aqueous solution. They find more and more applications in many hot topic areas, such as in biomaterials and nanoelectronics but also in stimuli-responsive films. We aim to review the most recent developments in such stimuli-responsive coatings based on layer-by-layer (LBL) depositions in relationship to the properties of these coatings. The most investigated stimuli are based on changes in ionic strength, temperature, exposure to light, and mechanical forces. The possibility to induce a transition from linear to exponential growth in thickness and to change the charge compensation from "intrinsic" to "extrinsic" by controlling parameters such as temperature, pH, and ionic strength are the ways to confer their responsiveness to the films. Chemical post-modifications also allow to significantly modify the film properties.

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Section: Stimuli Responsive Lbl Filmsmentioning

confidence: 99%

Dynamic Aspects of Films Prepared by a Sequential Deposition of Species: Perspectives for Smart and Responsive Materials

et al. 2011

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“…In order to obtain capsules with good integrity, the freestanding multilayers of the microcapsules should be strong enough to resist the osmotic pressure during the core removal process [38,39]. Therefore, the ten-layer BSA BSA layer Number Fig.…”

Section: Hollow Protein Microcapsulesmentioning

confidence: 99%

pH-responsive protein microcapsules fabricated via glutaraldehyde mediated covalent layer-by-layer assembly

2008

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Bovine serum albumin (BSA) hollow microcapsules were fabricated through glutaraldehyde (GA) mediated covalent layer-by-layer assembly. The GA crosslinking of the adsorbed BSA on the colloidal particles enabled their surfaces to be covered by reactive aldehyde groups, which reacted with BSA molecules to result in another covalently linked layer. Repeating of this cycle could then yield particles coated with BSA multilayers. Hollow microcapsules well dispersed in water were obtained after core removal. The good integrity and morphology of the BSA capsules were confirmed and characterized by confocal laser scanning microscopy, scanning electron microscopy and scanning force microscopy. The obtained BSA microcapsules possess reversible pH response, i.e., the capsules are permeable to macromolecules below pH 4 or above pH 10, while impermeable in between. The mechanisms of permeability transition were discussed. Using this property, dextran, with a molecular weight of~155 kDa, was successfully loaded.

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“…MF fibers itself and product A (Figure ) have alpha hydrogens (the hydrogen atom bonded to the carbon atom next to nitrogen atom) which can lead to an alpha dehydrohalogenation reaction . This reaction liberates molecular hydrochloric acid (HCl) having potential to catalyze the hydrolysis of diaminotriazine end groups (Figure ) into aminohydroxytriazine (ammeline‐type) and dihydroxytriazine end groups …”

Section: Resultsmentioning

confidence: 99%

Treatment of melamine formaldehyde fibers for decontaminating biological and chemical warfare agents

Kocer

Özkan

Broughton

et al. 2015

J of Applied Polymer Sci

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The demand for protection against biological and chemical warfare agents has increased the need for unique protective materials. N-halamines are superior candidates for this task by having rapid inactivation rates against a broad range of microorganisms and the ability to oxidize some pesticides and warfare agents to reduce their toxicity to humans. Thus, the design of N-halamine materials having fibrous structure, high halogen loading capacity with enhanced stability, and being relatively inexpensive is very important. This study investigated the effect of acid treatment on the chlorine loading and stability of a commercial flame retardant melamine formaldehyde (MF) fiber to introduce biocidal and detoxifying properties. The fibers formed into a web were treated with diluted sulfuric acid (H 2 SO 4 ) under various conditions. The fiber webs were chlorinated with household bleach, and the stability of bound chlorine was investigated. The treated fabrics have been tested against a Gram-negative bacterium and a warfare stimulant.

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The Decomposition Process of Melamine Formaldehyde Cores: The Key Step in the Fabrication of Ultrathin Polyelectrolyte Multilayer Capsules

Cited by 73 publications

References 0 publications

Dynamic Aspects of Films Prepared by a Sequential Deposition of Species: Perspectives for Smart and Responsive Materials

Dynamic Aspects of Films Prepared by a Sequential Deposition of Species: Perspectives for Smart and Responsive Materials

pH-responsive protein microcapsules fabricated via glutaraldehyde mediated covalent layer-by-layer assembly

Treatment of melamine formaldehyde fibers for decontaminating biological and chemical warfare agents

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