Design and Synthesis of Microencapsulated Phase-Change Materials with a Poly(divinylbenzene)/Dioxide Titanium Hybrid Shell for Energy Storage and Formaldehyde Photodegradation

Sun, Wenchang; Wang, Xiaomei; Zhang, Xu; Kong, Xiangming

doi:10.1021/acs.jpcc.0c06656

Cited by 16 publications

(8 citation statements)

References 50 publications

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“…It is noticeable that, during the energy release, the latent heat of PCM transferred to the TiO 2 augmented the kinetic energy of solute molecules, which accelerated interactions of pollutant molecules of MB molecules from the catalyst surface, where more holes and radicals formed and increased the rate of photocatalytic reaction. 50,51 If the rates of UV-light absorption are compared among all the samples, it is realized that TiO 2 plays the role of catalyst in this experiment and photocatalytic activity of TiO 2 /microPCMs increases with higher dosages of TiO 2 . This is a clear indication that TiO 2 -decorated microcapsules exhibit excellent photocatalytic activity as compared with the bare TiO 2 nanoparticles, and it is governed by the amount of TiO 2 present in the shell.…”

Section: Elemental Composition Of Microcapsulesmentioning

confidence: 95%

Titanium Dioxide Nanoparticle-Decorated Polymer Microcapsules Enclosing Phase Change Material for Thermal Energy Storage and Photocatalysis

Parvate

Singh

Dixit

et al. 2021

ACS Appl. Polym. Mater.

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Titanium dioxide (TiO2) nanoparticle decorated [poly(4-methylstyrene-co-divinylbenzene)] microcapsules enclosing phase change material (PCM) were synthesized following a one-pot non-Pickering emulsion templated suspension polymerization. TiO2 nanoparticles were hydrophobized using a trace amount of tertradecyltrimethylammonium bromide (TTAB, cationic stabilizer) through electrostatic interaction and employed as a particle stabilizer. The resulting microcapsules presented concurrent functionalities of thermal energy storage and photocatalytic activity. Scanning electron microscopy (SEM) identified that microencapsulated PCMs (microPCMs) exhibited a well-defined, core–shell structure with spherical morphology. The existence of TiO2 over the polymeric shell was confirmed by energy-dispersive X-ray (EDX) and X-ray diffraction (XRD) analysis. Differential scanning calorimetry (DSC) analysis demonstrated that microPCM with 2.6 wt % TiO2 achieved maximum phase change enthalpy of 174 J/g with an encapsulation efficiency of 76.6% and could maintain it even after 100 melting–freezing cycles. Thermogravimetric analysis (TGA) revealed that the addition of TiO2 contributed in improving the thermal stability of microPCMs. Most of all, the produced microcapsules exhibited great photocatalytic activity through the synergistic photothermal effect. The bifunctional microcapsules reported in this work would stimulate wide applications in the biomedical field, residential buildings in polluted urban sites, and industrial establishments as thermal energy storage and depollution materials.

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Section: Elemental Composition Of Microcapsulesmentioning

confidence: 95%

Titanium Dioxide Nanoparticle-Decorated Polymer Microcapsules Enclosing Phase Change Material for Thermal Energy Storage and Photocatalysis

Parvate

Singh

Dixit

et al. 2021

ACS Appl. Polym. Mater.

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“…[ 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 ]. In our previous work [ 29 ], a kind of MEPCM with TiO 2 /PDVB hybrid shell was fabricated by Pickering emulsion polymerization; nevertheless, the use efficiency of single functional TiO 2 NPs in the MEPCM is relatively low, nonfunctional PDVB shell could not achieve a synergetic combination of NPs and shell for further improving the multi-functionality especially the photocatalysis. Thus, by selecting suitable NPs and shell materials to construct heterojunction on the microcapsule, the various components can be fully contacted and entirely integrated.…”

Section: Introductionmentioning

confidence: 99%

Bi-Functional Paraffin@Polyaniline/TiO2/PCN-222(Fe) Microcapsules for Solar Thermal Energy Storage and CO2 Photoreduction

2021

Self Cite

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A novel type of bi-functional microencapsulated phase change material (MEPCM) microcapsules with thermal energy storage (TES) and carbon dioxide (CO2) photoreduction was designed and fabricated. The polyaniline (PANI)/titanium dioxide (TiO2)/PCN-222(Fe) hybrid shell encloses phase change material (PCM) paraffin by the facile and environment-friendly Pickering emulsion polymerization, in which TiO2 and PCN-222(Fe) nanoparticles (NPs) were used as Pickering stabilizer. Furthermore, a ternary heterojunction of PANI/(TiO2)/PCN-222(Fe) was constructed due to the tight contact of the three components on the hybrid shell. The results indicate that the maximum enthalpy of MEPCMs is 174.7 J·g−1 with encapsulation efficiency of 77.2%, and the thermal properties, chemical composition, and morphological structure were well maintained after 500 high–low temperature cycles test. Besides, the MEPCM was employed to reduce CO2 into carbon monoxide (CO) and methane (CH4) under natural light irradiation. The CO evolution rate reached up to 45.16 μmol g−1 h−1 because of the suitable band gap and efficient charge migration efficiency, which is 5.4, 11, and 62 times higher than pure PCN-222(Fe), PANI, and TiO2, respectively. Moreover, the CO evolution rate decayed inapparently after five CO2 photoreduction cycles. The as-prepared bi-functional MEPCM as the temperature regulating building materials and air purification medium will stimulate a potential application.

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“…Such capsules, lately, are also called “phase-change microcapsules” and are regarded as one of the sophisticated and pragmatic sustainable technologies for solar thermal energy storage . The thermal energy storage ability of phase-chase microcapsules with C/S = 1:1 was η = 80.73%, which clearly outperforms previously reported results. ,, Therefore, phase-change microcapsules obtained via Pickering emulsion-templated in situ polymerization also have good potential in solar energy storage/utilization targeting specific applications.…”

Section: Resultsmentioning

confidence: 80%

“…48 The thermal energy storage ability of phase-chase microcapsules with C/S = 1:1 was η = 80.73%, which clearly outperforms previously reported results. 47,49,50 Therefore, phase-change microcapsules obtained via Pickering emulsion-templated in situ polymerization also have good potential in solar energy storage/ utilization targeting specific applications.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Complex Polymeric Microstructures with Programmable Architecture via Pickering Emulsion-Templated In Situ Polymerization

Parvate

Chattopadhyay

2022

Langmuir

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Aside from smooth and spherical microcapsules, the concept of tailoring complex polymeric microstructures is being taken a step ahead due to their great demand in various applications and fundamental studies in the subjects of microfluidics and nanotechnology. Size, shape, and morphology are of paramount importance for their functional performance and various applications. However, simple, inexpensive, versatile, and high-throughput techniques for fabricating microcapsules with controlled morphology remain a bottleneck for discoveries in the subject of polymer colloids. In this paper, we directly fulfill this need by reporting a novel approach of Pickering emulsion-templated in situ polymerization for tailoring complex polymeric microstructures comprised of a composite shell of titanium dioxide nanoparticle (TiO2 NP)-embedded poly(melamine-urea-formaldehyde) (polyMUF) and a core of hexadecane (HD, soft template). At first, we hydrophobize TiO2 NPs by chemisorbing long-chain biobased myristic acid via a bidentate chelating complex and precisely tune their wettability by varying the grafting density of myristic acid to obtain highly stable oil-in-water (O/W) Pickering emulsion. Thereafter, we employ the optimized TiO2 NPs in the intended encapsulation strategy that enables various microstructures and morphologies with the particle diameter ranging from 5 to 20 μm. Careful manipulation of reaction parameters and copolymer components leads to novel complex microstructures: smooth, raspberry-like, partially budded, hollow, filled, single-holed, and closed-cell-like microstructures. Particle properties such as morphology, size, shell thickness, and core content are governed by the TiO2 NP content, core-to-shell ratio, copolymer component, conversion, and pH value. Based on the results of a series of control experiments, novel mechanisms for the formation of various such microstructures are proposed.

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Design and Synthesis of Microencapsulated Phase-Change Materials with a Poly(divinylbenzene)/Dioxide Titanium Hybrid Shell for Energy Storage and Formaldehyde Photodegradation

Cited by 16 publications

References 50 publications

Titanium Dioxide Nanoparticle-Decorated Polymer Microcapsules Enclosing Phase Change Material for Thermal Energy Storage and Photocatalysis

Titanium Dioxide Nanoparticle-Decorated Polymer Microcapsules Enclosing Phase Change Material for Thermal Energy Storage and Photocatalysis

Bi-Functional Paraffin@Polyaniline/TiO2/PCN-222(Fe) Microcapsules for Solar Thermal Energy Storage and CO2 Photoreduction

Complex Polymeric Microstructures with Programmable Architecture via Pickering Emulsion-Templated In Situ Polymerization

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