Ultra-small Bismuth Particle in Dendrimer Protected by Polyvinylpyrrolidone

Kambe, Tetsuya; Hosono, Reina; Imaoka, Takane; Yamamoto, Kimihisa

doi:10.2494/photopolymer.31.311

Cited by 5 publications

(6 citation statements)

References 32 publications

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“…One method that overcomes some of the synthetic limitations mentioned heretofore, especially those associated with ligand removal, is called dendrimer encapsulation. Dendrimer-encapsulated nanoparticles (DENs) are synthesized by taking advantage of highly dendritic polymers, or dendrimers, as synthetic templates for NP formation. ,, The typical size of DENs is in the range of just a few atoms to ∼300 atoms, making them very well suited for comparison to theory. ,− Commercially available poly(amidoamine) (PAMAM) dendrimers are the most commonly employed for the synthesis of DENs; however, the use of other dendrimers, − such as poly(propyleneimine) (PPI), has been reported …”

Section: Tools and Techniques For Comparing Experiments To Theorymentioning

confidence: 99%

Well-Defined Nanoparticle Electrocatalysts for the Refinement of Theory

et al. 2019

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The relationship between experiment and theory in electrocatalysis is one of profound importance. Until fairly recently, the principal role of theory in this field was interpreting experimental results. Over the course of the past decade (roughly the period covered by this review), however, that has begun to change, with theory now frequently leading the design of electrocatalytic materials. Though rewarding, this has not been a particularly easy union. For one thing, experimentalists and theorists have to come to grips with the fact that they rely on different models. Theorists make predictions based on individual, perfect structural models, while experimentalists work with more complex and heterogeneous ensembles of electrocatalysts. As discussed in this review, computational capabilities have improved in recent years, so that theory is better represented by the structures that experimentalists are able to prepare. Likewise, synthetic chemists are able to make ever more complex electrocatalysts with high levels of control, which provide a more extensive palette of materials for testing theory. The goal of this review is to highlight research from the last ∼10 years that focuses on carefully controlled electrocatalytic experiments which, in combination with theoretical predictions, bring us closer to bridging the gap between real catalysts and computational models.

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Section: Tools and Techniques For Comparing Experiments To Theorymentioning

confidence: 99%

Well-Defined Nanoparticle Electrocatalysts for the Refinement of Theory

et al. 2019

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“…After reduction, the solution was immediately added to a PVP solution to obtain polymer‐protected clusters. The purpose of the PVP protection was to further refine the synthesis of the FeSn 12 clusters and to improve their handling stability during the physical property measurements [21] . The PVP‐protected cluster solution was cast onto a transmission electron microscopy (TEM) grid and observed by scanning transmission electron microscopy (STEM) observation (Figure 1D–F).…”

Section: Resultsmentioning

confidence: 99%

“…We have developed a solution‐phase synthetic method using phenylazomethine dendrimers as templates to synthesize such clusters that consist of a few dozens of atoms [15,16] . This method enables not only the synthesis of clusters with precise atomicity control, but also enables the fabrication of alloy clusters with precise control in the composition ratio [15–21] . Furthermore, a phenylazomethine dendrimer (TPM G4), but also a customized version with pyridine in the core (pyTPM G4) developed in our group was further customized by replacing one of the four benzene rings in the core tetraphenylmethane part with a pyridine (pyTPM G4).…”

Section: Introductionmentioning

confidence: 99%

“…[15,16] This method enables not only the synthesis of clusters with precise atomicity control, but also enables the fabrication of alloy clusters with precise control in the composition ratio. [15][16][17][18][19][20][21] Furthermore, a phenylazomethine dendrimer (TPM G4), but also a customized version with pyridine in the core (pyTPM G4) developed in our group was further customized by replacing one of the four benzene rings in the core tetraphenylmethane part with a pyridine (pyTPM G4). This pyTPM G4 dendrimer is capable of collecting 13 atoms and, due to the difference in the Lewis basicity of the internal imine, it can collect 1 central metal atom and 12 surrounding atoms separately.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and functionalities of FeSn₁₂ superatom prepared by single atom introduction with a dendrimer template

Muramatsu,

Kambe,

Tsukamoto

et al. 2024

Chemistry A European J

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Superatoms are promising as new building block materials that can be designed by precise controlling of the constituent atoms. Stannaspherene (Sn122–) is a rigid cage‐like cluster with icosahedral symmetry, for which one‐atom encapsulation was theoretically expected and detected in the gas phase. Here, a single‐atom introduction method into stannaspherene using a dendrimer template with polyvinylpyrrolidone (PVP) protection is demonstrated. This advanced solution‐phase synthesis allows not only the selective doping of one atom into the cluster cage, but also enable further detail characterization of optical and magnetic properties that were not possible in the gas‐phase synthesis. In other words, this liquid‐phase synthesis method has enabled the adaptation of detailed analytical methods. In this study, FeSn12 was synthesized and characterized, revealing that a single Fe atom introduction in the Sn122– cage result in the appearance of near‐infrared emission and enhancement in the magnetism.

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“…Inorganic imaging agents, including Au, Fe 3 O 4 , Gd 2 O 3 , and Ag 2 S, can be reduced or precipitated via a dendrimer‐meditated template (Mekonnen et al, 2019; Yamamoto, Imaoka, Tanabe, & Kambe, 2019). This synthesis method for dendrimer‐encapsulated NPs offers a simple and convenient preparation strategy and a precise control of the particle size of the final product (Kambe, Hosono, Imaoka, & Yamamoto, 2018). It also helps increasing the stability and biocompatibility of the NPs with the aid of water‐soluble dendritic polymers.…”

Section: Design Strategies For Dendritic Nano‐scale Systems For Cancementioning

confidence: 99%

Recent advances in development of dendritic polymer‐based nanomedicines for cancer diagnosis

Sun

Zhu

et al. 2020

WIREs Nanomed Nanobiotechnol

173

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Dendritic polymers have highly branched three‐dimensional architectures, the fourth type apart from linear, cross‐linked, and branched one. They possess not only a large number of terminal functional units and interior cavities, but also a low viscosity with weak or no entanglement. These features endow them with great potential in various biomedicine applications, including drug delivery, gene therapy, tissue engineering, immunoassay and bioimaging. Most review articles related to bio‐related applications of dendritic polymers focus on their drug or gene delivery, while very few of them are devoted to their function as cancer diagnosis agents, which are essential for cancer treatment. In this review, we will provide comprehensive insights into various dendritic polymer‐based cancer diagnosis agents. Their classification and preparation are presented for readers to have a precise understanding of dendritic polymers. On account of physical/chemical properties of dendritic polymers and biological properties of cancer, we will suggest a few design strategies for constructing dendritic polymer‐based diagnosis agents, such as active or passive targeting strategies, imaging reporters‐incorporating strategies, and/or internal stimuli‐responsive degradable/enhanced imaging strategies. Their recent applications in in vitro diagnosis of cancer cells or exosomes and in vivo diagnosis of primary and metastasis tumor sites with the aid of single/multiple imaging modalities will be discussed in great detail. This article is categorized under: Therapeutic Approaches and Drug Discovery > Nanomedicine for Oncologic Disease Diagnostic Tools > in vivo Nanodiagnostics and Imaging Diagnostic Tools > in vitro Nanoparticle‐Based Sensing

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Ultra-small Bismuth Particle in Dendrimer Protected by Polyvinylpyrrolidone

Cited by 5 publications

References 32 publications

Well-Defined Nanoparticle Electrocatalysts for the Refinement of Theory

Well-Defined Nanoparticle Electrocatalysts for the Refinement of Theory

Synthesis and functionalities of FeSn₁₂ superatom prepared by single atom introduction with a dendrimer template

Recent advances in development of dendritic polymer‐based nanomedicines for cancer diagnosis

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Ultra-small Bismuth Particle in Dendrimer Protected by Polyvinylpyrrolidone

Cited by 5 publications

References 32 publications

Well-Defined Nanoparticle Electrocatalysts for the Refinement of Theory

Well-Defined Nanoparticle Electrocatalysts for the Refinement of Theory

Synthesis and functionalities of FeSn12 superatom prepared by single atom introduction with a dendrimer template

Recent advances in development of dendritic polymer‐based nanomedicines for cancer diagnosis

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Product

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Synthesis and functionalities of FeSn₁₂ superatom prepared by single atom introduction with a dendrimer template