Colloidal clusters of icosahedrons and face-centred cubes

Wu, Wenna; Wang, Yitong; Guo, Luxuan; Dong, Shuli; Hao, Jingcheng

doi:10.1016/j.jcis.2019.12.084

Cited by 9 publications

(9 citation statements)

References 55 publications

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“…The amphoteric surfactant was explored, and it was found that in Figure S2 in the Supporting Information when the pH is lower than the isoelectric point of the surfactant, no assembly appears (Figure S2b in the Supporting Information), while the assembly forms when the pH is higher than the isoelectric point (Figure S2c in the Supporting Information). It is supposed that the electrostatic repulsion between surfactants and UCNPs may hinder the formation of SPs, which is consistent with our previously reported results . Our attention is focused on different types of anionic surfactants.…”

Section: Results and Discussionsupporting

confidence: 90%

“…The OA-stabilized lanthanide-doped upconversion nanoparticles, NaGdF 4 : 20% Yb 3+ , 2% Er 3+ were synthesized by a thermal decomposition method with modification of our previous works. 24 − 26 The TEM image of the UCNPs in Figure 1 a suggests that the nanoparticles are uniform and have an average diameter of about 16.6 nm determined by random measurement of 100 particles. These prepared UCNPs are used as building blocks to fabricate assemblies of SPs based on a surfactant-assisted emulsion self-assembly method.…”

Section: Results and Discussionmentioning

confidence: 99%

“…It is supposed that the electrostatic repulsion between surfactants and UCNPs may hinder the formation of SPs, which is consistent with our previously reported results. 26 Our attention is focused on different types of anionic surfactants. The names and chemical structures of anionic surfactants are summarized in Table S1 in the Supporting Information.…”

Section: Results and Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Photovoltaic Energy Conversion and Storage of Micro-Supercapacitors Based on Emulsion Self-Assembly of Upconverting Nanoparticles

Yuan

Dong

et al. 2021

ACS Cent. Sci.

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With the rapid need for new kinds of portable and wearable electronics, we must look to develop flexible, small-volume, and high-performance supercapacitors that can be easily produced and stored in a sustainable way. An integrated system simultaneously converting recyclable energy to electricity and storing energy is sought after. Here we report photovoltaic energy conversion and storage integrated micro-supercapacitors (MSCs) with asymmetric, flexible, and all-solid-state performances constructed from thousands of close-packed upconverting nanoparticles (UCNPs) via an emulsion-based self-assembly process using oleic acid (OA)-capped upconverting nanoparticles. The carbonated-UCNPs supraparticles (CSPs) are further coated with polypyrrole (PPy) to improve their electrochemical performance. Such a design can develop CSPs@PPy as electrode materials with high gravimetric capacitance, 308.6 F g –1 at 0.6 A g –1 . The fabricated MSCs exhibit excellent areal capacitance, C s = 21.8 mF cm –2 at 0.36 A cm –2 and E = 0.00684 mWh cm –2 , and have superior flexibility and cycling ability. The MSC devices have a sensitive near-infrared ray (NIR) photoelectrical response capability, which can capture the NIR of sunlight to convert it into electrical energy and store the electric energy due to an excellent capacitive performance. We propose a method for multifunctional integration of energy conversion and storage, and provide future research directions and potential applications of self-powered flexible wearable photonic electronics.

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Section: Results and Discussionsupporting

confidence: 90%

Section: Results and Discussionmentioning

confidence: 99%

Section: Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Photovoltaic Energy Conversion and Storage of Micro-Supercapacitors Based on Emulsion Self-Assembly of Upconverting Nanoparticles

Yuan

Dong

et al. 2021

ACS Cent. Sci.

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“…Interestingly, such an icosahedral cluster has been recently reported in a system of colloidal particle aggregation, and their developmental process has been studied in detail. [ 16,17,26,34–37 ] The FCC lattice is a thermodynamically stable structure for the bulk colloidal crystal. These facts immediately pose a natural question: how large is the icosahedral colloidal cluster?…”

Section: Introductionmentioning

confidence: 99%

“…Several groups have reported on a spherical cluster with icosahedral symmetry. [ 16,17,26,34–37 ] In 2015, Nijs et al. reported an experimental and theoretical study that indicated an icosahedral cluster could be formed when the number of colloidal particles was less than 1 × 10 4 .…”

Section: Introductionmentioning

confidence: 99%

Optical Characterization of Large Icosahedral Colloidal Clusters

Ohnuki

Kunimoto

Takeoka

et al. 2022

Part & Part Syst Charact

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Colloidal particles form a face‐centered‐cubic (FCC) lattice on crystallization; however, recent studies have indicated that the cluster with the icosahedral symmetry can be formed under spherical confinement. The icosahedral cluster appears only when the number of constituent particles is small because the FCC lattice is favored thermodynamically for a bulk colloidal crystal. This paper reports the observation of a large icosahedral colloidal cluster comprising ≈4.9 × 105 colloidal particles, which is considerably larger than the previously reported number. This large icosahedral cluster clearly exhibits the triangular reflection pattern that corresponds to one face of the icosahedron. Further, an oblique illumination with sample rotation is found to be an effective method to characterize the icosahedral cluster optically. In this study, larger colloidal particles are used than those in previous studies. It is hypothesized that slow reconfiguration during the evaporation process can result in the formation of a large icosahedral cluster due to the large particle size.

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