Thin films of layered double hydroxide and silver-doped polystyrene particles

Bujdosó, Tamás; Hornok, Viktória; Dékány, Imre

doi:10.1016/j.clay.2010.11.026

Cited by 10 publications

(4 citation statements)

References 43 publications

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“…Hollow capsules were obtained after the removal of the PS core and the PSS polyanion by calcination at 500 °C, followed by LDH reconstruction by exposure to humid air. In another example, sulfonated PS latex particles were prepared in a preliminary step and doped with silver nanoparticles (AgNP) through adsorption and reduction of silver salts . Subsequently, a multilayer film was formed by alternate deposition of the negatively charged PS/Ag particles and LDH nanoplatelets, which have potential interest as antibacterial surfaces.…”

Section: New Trends and Strategies For Ldh And Hybrid Ldh Synthesismentioning

confidence: 99%

Tailoring Hybrid Layered Double Hydroxides for the Development of Innovative Applications

Taviot-Guého

Prévot

Forano

et al. 2017

Adv Funct Materials

240

142

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International audienceHybrid materials based on layered double hydroxides (LDHs) exhibit great potential in diverse fields such as health care, polymer composites, environment, catalysis, and energy generation. Indeed, the compositional flexibility and the scalability of LDH structures, their low cost, and their ease of synthesis have made hybrid LDHs extremely attractive for constructing smart and high-performance multifunctional materials. This review provides a comprehensive and critical overview of the current research on multifunctional hybrid LDHs. Organic–inorganic hybrid LDHs, intercalated and surface-immobilized structures, are both specifically addressed. The new trends and strategies for hybrid LDH synthesis are first described, and then the potential of the latest hybrid LDHs, polymer LDH nanocomposites, and LDH bio-nanocomposites are presented. Significant achievements published from ≈2010, including authors' results, which employ hybrid LDH assemblies in materials science, medicine, polymer nanocomposites, cement chemistry, and environmental technologies, are specifically addressed. It is concluded with remarks on present challenges and future prospects

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Section: New Trends and Strategies For Ldh And Hybrid Ldh Synthesismentioning

confidence: 99%

Tailoring Hybrid Layered Double Hydroxides for the Development of Innovative Applications

Taviot-Guého

Prévot

Forano

et al. 2017

Adv Funct Materials

240

142

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“…Vários fatores influenciam a estrutura intercalada do HDL na matriz polimérica e, por consequência, as características do processo de combustão do polímero. Como exemplo o tempo de refluxo, a concentração de HDL no solvente, o tipo de solvente e método de preparação [14][15][16][17][18] . São encontrados relatos sobre incorporação de HDL em poliestireno de diferentes formas: (i) durante a polimerização do monômero de estireno, via emulsão [14,15] , (ii) na síntese in situ com a mistura dos monômeros e do HDL [16] , (iii) na preparação via intercalação de poliestireno em solução de xileno para formar PS-HDL [17] e (iv) incorporação física no polímero via os processos de extrusão ou fusão [18] .…”

Section: +unclassified

Comportamento térmico de compósitos PS-HDL (Mg-Al) modificados com DBS e SDS

et al. 2015

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ResumoHoje em dia é crescente a quantidade de estudos envolvendo a utilização de cargas ou aditivos nos materiais poliméricos, em especial no poliestireno, a fim de atuar como retardante de chama. Partindo desse princípio, este trabalho compara o comportamento térmico dos compósitos de poliestireno/hidróxido duplo lamelar magnésio-alumínio (PS-HDL [Mg-Al]) em relação ao poliestireno puro. Os compostos foram preparados com HDL, quimicamente modificado com dodecil sulfato de sódio (SDS-Na) ou com dodecilbenzeno sulfonato de sódio (DBS-Na). A síntese desses aditivos (HDL-SDS e HDL-DBS) foi feita pelo método de coprecipitação e inseridos no PS via solubilização em clorofórmio. Os compostos foram caracterizados por difratometria de raios-X e espectroscopia de infravermelho por transformada de Fourier, onde o primeiro comprovou a intercalação do DBS/SDS com o HDL e o segundo confirmou a presença dos grupos característicos no HDL. Através da análise termogravimétrica, avaliaram-se as propriedades térmicas do compósito. Os resultados mostraram que o PS-HDL modificado comporta-se melhor que o PS puro, pois apresenta maior estabilidade térmica. Comparando-os em uma perda de massa de 50%, o PS-HDL-SDS apresentou resultado superior ao PS puro, com um ganho de aproximadamente 44 ºC na temperatura de decomposição térmica. Palavras-chave: comportamento térmico, poliestireno, hidróxido duplo lamelar, modificação química. AbstractNowadays there is an increasing number of studies involving the use of fillers or additives for polymeric materials, in particular polystyrene, as flame retardants. Starting from this principle, this paper compares the thermal performance of composites of polystyrene/double layered magnesium-aluminium hydroxide (PS-LDH [Mg-Al]) compared to pure polystyrene. Compounds were prepared with LDH, chemically modified with sodium dodecyl sulphate (SDS-Na) or sodium dodecylbenzene sulfonate (SDB-Na). The synthesis of these additives (SDS-LDH and SDB-LDH) was carried out by the coprecipitation method and inserted via the PS dissolution in chloroform. The compounds were characterized by X-ray diffraction and Fourier transform infrared spectroscopy, where the first method proved the intercalation of the SBD/SDS with LDH and the second confirms the presence of the characteristic groups in LDH. Thermal properties of the composite were evaluated by thermo gravimetric analysis. The results showed that the modified PS-LDH behaves better than pure PS, it has higher thermal stability. Comparing them in a mass loss of 50%, the PS-LDH-SDS showed better results compared to pure PS, with a gain of approximately 44 ºC in the thermal decomposition temperature.

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“…Emulsions are one of the important classes of multiphase materials. − Usually, they are considered thermodynamically unstable because of their high inner interfacial area and can be stabilized only kinetically, for example, using particles. − However, this general view is challenged by numerous observations on spontaneous emulsification. − These observations hold a promise for thermodynamically stable emulsions.…”

Section: Introductionmentioning

confidence: 99%

On the Negative Surface Tension of Solutions and on Spontaneous Emulsification

Kaptay

2017

Langmuir

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The condition of negative surface tension of a binary regular solution is discussed in this paper using the recently reconfirmed Butler equation (Langmuir 2015, 31, 5796-5804). It is shown that the surface tension becomes negative only for solutions with strong repulsion between the components. This repulsion for negative surface tension should be so strong that this phenomenon appears only within a miscibility gap, that is, in a two-phase region of macroscopic liquid solutions. Thus, for a macroscopic solution, the negative surface tension is possible only in a nonequilibrium state. However, for a nano-solution, negative surface tension is also possible in equilibrium state. It is also shown that nano- and microemulsions can be thermodynamically stable against both coalescence and phase separation. Further, the thermodynamic theory of emulsion stability is developed for a three-component (A-B-C) system with A-rich droplets dispersed in a C-rich matrix, separated by the segregated B-rich layer (the solubility of B is limited in both A and C while the mutual solubility of A and C is neglected). It is shown that when a critical droplet size is achieved by forced emulsification, it is replaced by spontaneous emulsification and the droplet size is reduced further to its equilibrium value. The existence of maximum temperature of emulsion stability is shown. Using low-energy emulsification below this maximum temperature, spontaneous emulsification can appear, which is enhanced with further decrease of temperature. This finding can be applied to interpret the experimental observations on spontaneous emulsification or for the design of stable micro- and nanoemulsions.

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Thin films of layered double hydroxide and silver-doped polystyrene particles

Cited by 10 publications

References 43 publications

Tailoring Hybrid Layered Double Hydroxides for the Development of Innovative Applications

Tailoring Hybrid Layered Double Hydroxides for the Development of Innovative Applications

Comportamento térmico de compósitos PS-HDL (Mg-Al) modificados com DBS e SDS

On the Negative Surface Tension of Solutions and on Spontaneous Emulsification

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