Growth mechanism of hollow ZnO crystals from ZnSe

Iwanaga, Hiroshi; Shibata, N.

doi:10.1016/0022-0248(74)90335-2

Cited by 37 publications

(19 citation statements)

References 18 publications

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“…The strong acceptor‐donor π‐interactions in the CT crystals promote one‐dimensional stacking along the c ‐axis, which promotes rapid growth in this direction. In the limit of diffusion limited growth, molecules toward the interior are depleted, while molecules from the surrounding solution can readily accumulate on the outer edges of the crystal, leading to more rapid growth of the outer edges and tubular growth [6a, 14] . In our system, the micelles containing acceptor and donor molecules will diffuse even more slowly, reinforcing the limited transport that leads to rapid growth of the edges.…”

Section: Figurementioning

confidence: 82%

Molecular Crystal Microcapsules: Formation of Sealed Hollow Chambers via Surfactant‐Mediated Growth

Tong

et al. 2020

Angewandte Chemie

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Hollow organic molecular cocrystals comprised of 9-methylanthracene-1,2,4,5-tetracyanobenzene (9MA-TCNB) and naphthalene-1,2,4,5-tetracyanobenzene (NAPH-TCNB) were fabricated using a surfactant-mediated co-reprecipitation method. The crystals exhibit a narrow size distribution that can be easily tuned by varying the concentration of surfactant and incubation temperature. The rectangular crystals possess symmetrical twinned cavities with an estimated storage volume on the order of 10 À10 L. An aqueous dye solution can be incorporated into the cavities during crystal growth and stored inside for up to several hours, confirming the sealed nature of the hollow chambers. Our results demonstrate that it is possible to harness non-classical crystal growth to fabricate organic molecular crystals with novel topologies.

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Section: Figurementioning

confidence: 82%

Molecular Crystal Microcapsules: Formation of Sealed Hollow Chambers via Surfactant‐Mediated Growth

Tong

et al. 2020

Angewandte Chemie

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“…Substances like metals and carbon [1][2][3] have been investigated and different production processes were discovered. Furthermore, various inorganic and organic substances were reported to form hollow needles [4,5].…”

Section: Introductionmentioning

confidence: 99%

Generation of Crystalline Hollow Needles: New Approach by Liquid‐Liquid Phase Transformation

2011

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The formation of hollow crystalline needles by means of a solvent-mediated phase transformation takes place during the dehydration of hydrate crystals in methanol into hollow needle-shaped anhydrate crystals. Here, a special way of achieving needle growth is presented. When a saturated aqueous solution of sodium-2-ketogulonate is dropped into methanol, a simultaneous nucleation of monohydrate crystals and anhydrate needles takes place in the alcohol. It was proven by scanning electron microscope images that these needles are hollow. By means of the variation of the production method, it is for the first time possible to observe the needle growth in a more detailed manner, and to show that the nucleation can take place at impurities and surface roughnesses. The method helped to discuss and to deepen the understanding of the growth mechanism of the hollow crystalline needles.

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“…In the 1960s, Folkman et al developed silicone rubber as a drug carrier, which prolonged the effective therapy of the drug and aroused much interest on the drug delivery system [9]. In 1974, Hiroshi et al fabricated hollow ZnO [10], which initiated the era of hollow materials. Following this, research on hollow structures with micro/nano scale as drug carriers sprung up.…”

Section: Introductionmentioning

confidence: 99%

Hollow structures as drug carriers: Recognition, response, and release

Zhao

Yang

et al. 2021

Nano Res.

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Hollow structures have demonstrated great potential in drug delivery owing to their privileged structure, such as high surface-to-volume ratio, low density, large cavities, and hierarchical pores. In this review, we provide a comprehensive overview of hollow structured materials applied in targeting recognition, smart response, and drug release, and we have addressed the possible chemical factors and reactions in these three processes. The advantages of hollow nanostructures are summarized as follows: hollow cavity contributes to large loading capacity; a tailored structure helps controllable drug release; variable compounds adapt to flexible application; surface modification facilitates smart responsive release. Especially, because the multiple physical barriers and chemical interactions can be induced by multishells, hollow multishelled structure is considered as a promising material with unique loading and releasing properties. Finally, we conclude this review with some perspectives on the future research and development of the hollow structures as drug carriers.

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Growth mechanism of hollow ZnO crystals from ZnSe

Cited by 37 publications

References 18 publications

Molecular Crystal Microcapsules: Formation of Sealed Hollow Chambers via Surfactant‐Mediated Growth

Molecular Crystal Microcapsules: Formation of Sealed Hollow Chambers via Surfactant‐Mediated Growth

Generation of Crystalline Hollow Needles: New Approach by Liquid‐Liquid Phase Transformation

Hollow structures as drug carriers: Recognition, response, and release

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