Synthesis of Half‐Sphere/Half‐Funnel‐Shaped Silica Structures by Reagent Localization and the Role of Water in Shape Control

Datskos, Panos G.; Polizos, Georgios; Cullen, David A.; Bhandari, Mahabir; Sharma, Jaswinder

doi:10.1002/chem.201604130

Cited by 6 publications

(7 citation statements)

References 36 publications

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“…2 Under this growth mechanism, it is possible to prepare more complex silica particles with multiblock or segmented structures by varying the reaction parameters during growth. [22][23][24][25][26] The localization of the growing silica particles at the emulsion interfaces is a prerequisite for such anisotropic growth (Fig. S7 †).…”

Section: Resultsmentioning

confidence: 99%

“…[16][17][18][19][20][21] Particularly, more complex, segmented silica structures and related hybrid structures were prepared by simply regulating the reaction parameters during the one-dimensional growth. [22][23][24][25][26][27] This water-in-alcohol emulsion system has shown incomparable versatility in the controlled synthesis of anisotropic silica micro-/ nanostructures. Current study mostly focuses on the formation of rod-like structures in 1-pentanol/ethanol alcohol system, while other interesting silica materials, such as anisotropic hollow silica particles, are rarely studied.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis of anisotropic silica colloids

Wang

Zhang

et al. 2017

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis of anisotropic silica colloids

Wang

Zhang

et al. 2017

RSC Adv.

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“…Sodium was added to the reaction as a counter ion of citrate and is expected to be mainly present in the droplet, as shown by Datskos et al in 2016. 56 Therefore, if part of the droplet got encapsulated during growth, a fraction of sodium should be found left behind inside the hollow sphere. The EDX map of these silica rods with a hollow sphere attached indeed shows that there is a higher concentration of sodium in the center of the sphere and a lower concentration throughout the straight segment.…”

Section: Resultsmentioning

confidence: 99%

Shaping Silica Rods by Tuning Hydrolysis and Condensation of Silica Precursors

et al. 2018

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We present the synthesis of colloidal silica particles with new shapes by manipulating the growth conditions of rods that are growing from polyvinylpyrrolidone-loaded water-rich droplets containing ammonia and ethanol. The silica rods grow by ammonia-catalyzed hydrolysis and condensation of tetraethoxysilane (TEOS). The lengthwise growth of these silica rods gives us the opportunity to change the conditions at any time during the reaction. In this work, we vary the availability of hydrolyzed monomers as a function of time and study how the change in balance between the hydrolysis and condensation reactions affects a typical synthesis (as described in more detail by our group earlier1). First, we show that in a “standard” synthesis, there are two silica growth processes occurring; one in the oil phase and one in the droplet. The growth process in the water droplet causes the lengthwise growth of the rods. The growth process in the oil phase produces a thin silica layer around the rods, but also causes the nucleation of 70 nm silica spheres. During a typical rod growth, silica formation mainly takes place in the droplet. The addition of partially hydrolyzed TEOS or tetramethoxysilane (TMOS) to the growth mixture results in a change in balance between the hydrolysis and condensation reaction. As a result, the growth also starts to take place on the surface of the water droplet and thus from the oil phase, not only from inside the droplet onto a silica rod sticking out of the droplet. Carefully tuning the growth from the droplet and the growth from the oil phase allowed us to create nanospheres, hollow silica rods, hollow sphere rod systems (colloidal matchsticks), and bent silica rods.

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“…The synthesis is simple and reproducible, and can be used to prepare rods with an aspect ratio up to 25 on a large scale. Following this work, several kinds of other silica rods were synthesized by other research groups (Figure g,h) …”

Section: Non‐templated Synthesismentioning

confidence: 99%

“…Following this work, several kinds of other silica rods were synthesized by other research groups (Figure 1g,h). [29][30][31][32]…”

Section: Colloidal Rodsmentioning

confidence: 99%

Anisotropic Colloids: From Non‐Templated to Patchy Templated Synthesis

Liu

Zhao

2018

Chemistry A European J

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Self-assembly of colloidal particles is an important and challenging way to generate novel colloidal superstructures for new materials. Recent progress on syntheses of anisotropic colloids highlights opportunities for such self-assembly, particularly in defining new non-cubic superstructures. Both non-templated and templated synthesis play an important role in preparing anisotropic colloidal particles. In this article, we briefly summarize recent progress in anisotropic colloids by non-templated and conventional templated synthesis, and introduce a conceptual strategy of "patchy templated synthesis" that differs from the conventional approach. We illustrate this strategy with recent examples emanating from colloidal rings, and discuss the future opportunities with this strategy for the synthesis of other anisotropic colloids.

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Synthesis of Half‐Sphere/Half‐Funnel‐Shaped Silica Structures by Reagent Localization and the Role of Water in Shape Control

Cited by 6 publications

References 36 publications

Synthesis of anisotropic silica colloids

Synthesis of anisotropic silica colloids

Shaping Silica Rods by Tuning Hydrolysis and Condensation of Silica Precursors

Anisotropic Colloids: From Non‐Templated to Patchy Templated Synthesis

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