Influence of operation conditions on the microencapsulation of PCMs by means of suspension-like polymerization

Sanchez, Luz M.; Sánchez, Paula; Carmona, Manuel; Lucas, Antonio de; Rodrı́guez, Juan F.

doi:10.1007/s00396-008-1864-4

Cited by 110 publications

(55 citation statements)

References 19 publications

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“…Sánchez et al [45] fabricated MEPCMs by encapsulating 50wt% of paraffin wax PRS, tetradecane, Rubitherm 20 and nonadecane as core materials in a polystyrene shell. Further experimental studies by Sánchez et al [46] proved that crosslinking reaction temperature has no significant effect on the particle size distribution. It also revealed that it is difficult to achieve encapsulation when core/shell mass ratio is greater than 2.00.…”

Section: Suspension Polymerizationmentioning

confidence: 98%

Review of solid–liquid phase change materials and their encapsulation technologies

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

771

267

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Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition, they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles was identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs. Abstract: Various types of solid-liquid phase change materials (PCMs) have been reviewed for thermal energy storage applications. The review has shown that organic solid-liquid PCMs have much more advantages and capabilities than inorganic PCMs but do possess low thermal conductivity and density as well as being flammable. Inorganic PCMs possess higher heat storage capacities and conductivities, cheaper and readily available as well as being non-flammable, but do experience supercooling and phase segregation problems during phase change process. The review has also shown that eutectic PCMs have unique advantage since their melting points can be adjusted. In addition they have relatively high thermal conductivity and density but they possess low latent and specific heat capacities. Encapsulation technologies and shell materials have also been examined and limitations established. The morphology of particles were identified as a key influencing factor on the thermal and chemical stability and the mechanical strength of encapsulated PCMs. In general, in-situ polymerization method appears to offer the best technological approach in terms of encapsulation efficiency and structural integrity of core material. There is however the need for the development of enhancement methods and standardization of testing procedures for microencapsulated PCMs.

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Section: Suspension Polymerizationmentioning

confidence: 98%

Review of solid–liquid phase change materials and their encapsulation technologies

Darkwa

Kokogiannakis

2015

Renewable and Sustainable Energy Reviews

771

267

View full text Add to dashboard Cite

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“…Microencapsulation finds potential extensive applications in the agricultural, industrial, engineering, and medical fields such as carbonless copying paper, flame retardants, pharmaceutical applications, foods, catalysis, self-healing materials, phase change materials, and pesticides. [7][8][9][10][11][12][13][14][15][16] By utilizing an interfacial polymerization technique, microcapsules with different polymeric shell walls like polyamide, polyurethane, and polyurea were fabricated to achieve resistance for infectiousness, superior compatibility, chemical stability in conjunction to excellent physical and thermal properties. [17][18][19][20][21] The shell is often made of synthetic or natural thin polymeric membranes to be used effectively for controlled release, reduction in phytotoxicity, end user safety, etc.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of dendritic 0 G PAMAM-based novel polyurea microcapsules for encapsulation of herbicide and release rate from polymer shell in different environment

Hedaoo

Tatiya

Mahulikar

et al. 2013

Designed Monomers and Polymers

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New sequence of microcapsules with dendritic PAMAM-based novel polyurea as shell wall material containing herbicide as a core moiety has been prepared by interfacial polymerization technique. Dendrimer-based polymeric microcapsules were fabricated with aim to study the effect of different reaction parameters such as surfactant dose, core loading, agitation speed, and amount of solvent on particle size, particle size distribution, and appearance of microcapsules. Prepared microcapsules were characterized by FTIR, thermo gravimetric analysis, particle size analysis, scanning electron microscope, and other microscopic technique. In present investigation, surfactant dose of 2.5% with 5 mL of solvent at 400 rpm was found to be optimum for fabrication of stable new polyurea microcapsules containing 1 g of core. The synthesized microcapsules with optimized parameters were evaluated quantitatively for controlled release study by gas chromatography in different environmental conditions. The highest percent release of core was found in acidic conditions compared to that of basic and least in neutral medium.

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“…따라서 축광 물질을 캡슐화하면 축광 물질의 내구성과 페인트와의 상용성을 높일 수 있다 [11]. 최근 마이크로미터 크기보다 작은 입도의 입자들을 캡슐화한 논문들은 많이 출간되어 있지만 마이크로 입도의 무기물질을 현탁 중합으로 캡슐화한 논문은 많지 않다 [12]. …”

Section: )unclassified

Microencapsulation of SrAl₂O₄ : Eu²⁺,Dy³⁺ Phosphorescent Phosphor for Enhanced Visibility of Road Lanes

Park¹,

Jeong²,

Cheong³

2016

Adhesion and Interface

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A decrease in the retro-reflectivity of glass-bead-covered road paint because of a rainwater film significantly reduces the visibility of drivers at night, and has been considered as a critical cause of traffic accidents. For enhanced visibility, the microencapsulation of hydrophobically modified SrAl2O4 : Eu 2+ ,Dy 3+ phosphorescent phosphor was carried out via suspension polymerization of methyl methacrylate (MMA). The effects of surface modification agent and radical initiator types, loading amount of phosphorescent phosphor, and microcapsule size on the phosphor content (WTGA) in the luminous poly(methyl methacrylate) (PMMA) microcapsules were investigated by thermogravimetric analyses (TGA). It was found that the WTGA value was ranged from 7 wt% to 81 wt%, which suggests suspension polymerization is suitable for the preparation of luminous microcapsules with a wide range of phosphor content. At a lower loading amount of phosphor, the WTGA value obviously increased as the microcapsule size decreased; however, the WTGA values with a higher loading amount of phosphor were less affected by the microcapsule size. The luminous microcapsules with the size range of 425~710 µm were collected and tested as a luminous road lanes. It was found that luminance intensities of the microcapsule-coated plates remained higher than 300 mcd/m 2 for up to 100 s in darkness after 20 min of light emitting diode lamp irradiation. The results suggest that the luminous microcapsules can be a candidate for the replacement of glass beads for enhanced visibility of drivers.

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Influence of operation conditions on the microencapsulation of PCMs by means of suspension-like polymerization

Cited by 110 publications

References 19 publications

Review of solid–liquid phase change materials and their encapsulation technologies

Review of solid–liquid phase change materials and their encapsulation technologies

Fabrication of dendritic 0 G PAMAM-based novel polyurea microcapsules for encapsulation of herbicide and release rate from polymer shell in different environment

Microencapsulation of SrAl₂O₄ : Eu²⁺,Dy³⁺ Phosphorescent Phosphor for Enhanced Visibility of Road Lanes

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Influence of operation conditions on the microencapsulation of PCMs by means of suspension-like polymerization

Cited by 110 publications

References 19 publications

Review of solid–liquid phase change materials and their encapsulation technologies

Review of solid–liquid phase change materials and their encapsulation technologies

Fabrication of dendritic 0 G PAMAM-based novel polyurea microcapsules for encapsulation of herbicide and release rate from polymer shell in different environment

Microencapsulation of SrAl2O4 : Eu2+,Dy3+ Phosphorescent Phosphor for Enhanced Visibility of Road Lanes

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Product

Resources

About

Microencapsulation of SrAl₂O₄ : Eu²⁺,Dy³⁺ Phosphorescent Phosphor for Enhanced Visibility of Road Lanes