Covalent Functionalization of FeCo/Graphitic Shell Nanocrystals via 1,3‐Dipolar Cycloaddition

Kim, Da Jeong; Hong, Yonghoon; Seo, Yu Jeong; Lee, Sung Woo; Gil, Na-Yeon; Moon, Bongjin; Cha, Hyuk‐Jin; Lee, Gaehang; Seo, Won Seok

doi:10.1002/cnma.201700223

Cited by 4 publications

(2 citation statements)

References 43 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the prepared MNP−Mn‐PEG can be administrated at lower doses to achieve similar contrast of Dotarem . The reasons of such higher intensity can be explained due to complexing of Mn 2+ to the o‐dihydroxyl group of the catechol unit resulted in interaction of water molecules to oxygen atoms of ion‐catechol complex, restriction of rotational mobility of MNP−Mn complex,, high absorption of Mn 2+ in MNP,, direct coordination of two water molecules with Mn 2+ complexed to MNP and providing fast inner sphere water exchange ,. Finally, these results demonstrate MNP−Mn‐PEG is low toxic and can be used as MRI contrast agent in much lower concentrations in comparison to Dotarem contrast agent to provide similar bright contrast.…”

Section: Resultsmentioning

confidence: 78%

Preparation of Bio‐Inspired Melanin Nanoplatforms Chelated with Manganese Ions as a Potential T1 MRI Contrast Agent

2019

View full text Add to dashboard Cite

Commercial contrast agents demonstrated release risk of the toxic gadolinium ions, and designing of highly stable complexes of biogenic element such as Mn is challenging. In this contribution, Mn‐melanin nanoparticles have been prepared and reacted with m‐PEG. The effect of initial amount of Mn ions on the Mn absorption and its release by melanin nanoparticles (MNP) has been investigated. It has been found that MNP absorb and release more Mn ion by increasing the initial amount of Mn ions. It has been found that time and temperature has no significant effect on Mn absorption by MNP. It is found that the hydrodynamic size of MNP is in accordance with size of MNP which measured with TEM analysis (5.5±2 nm) and the effect of chain of m‐PEG and conformational alteration of MNP is responsible of hydrodynamic size variation. The zeta potential of MNP is decreased by PEGylation and reaction with Mn ions. MNP−Mn‐PEG demonstrated low toxicity up to 3.45 mg/mL after 24 h for human embryonic kidney cells. Finally, the r1 value of MNP−Mn‐PEG is 10 fold higher than Dotarem as the commercial MRI contrast agent which can be administrated at much lower doses to achieve similar contrast of Dotarem.

show abstract

Section: Resultsmentioning

confidence: 78%

Preparation of Bio‐Inspired Melanin Nanoplatforms Chelated with Manganese Ions as a Potential T1 MRI Contrast Agent

2019

View full text Add to dashboard Cite

show abstract

“…Moreover, carbon shells tend to have porous structures because they are formed from the thermal decomposition of the given carbon sources without being supplied with additional precursors, leading to a weak structure that is easily broken 40 , 44 . On the other hand, carbon materials produced by the chemical vapor deposition (CVD) of carbon precursors such as methane, ethylene, benzene, and alcohols have characteristics of imperviousness, high purity and hardness 45 , 46 . Also, their structural features (e.g., density or porosity) can easily be controlled by the reaction time and type of carbon sources 42 , 43 .…”

Section: Resultsmentioning

confidence: 99%

Au nanoparticle@hollow mesoporous carbon with FeCo/graphitic shell nanoparticls as a magnetically recyclable yolk–shell nanocatalyst for catalytic reduction of nitroaromatics

Hong

Choi

Seo

2018

Sci Rep

Self Cite

View full text Add to dashboard Cite

We have developed a highly stable and magnetically recyclable yolk–shell nanocatalyst for catalytic reduction of nitroaromatics. This nanocatalyst is composed of a ~13 nm Au nanoparticle encapsulated in a hollow mesoporous carbon (hmC) shell with a diameter of ~120 nm and a thickness of ~15 nm. The hmC shell contains ~6 nm FeCo/graphitic carbon shell (FeCo/GC) nanoparticles. We have synthesized the Au@hmC-FeCo/GC nanocatalyst by thermal decomposition of Fe and Co precursors in silica of a solid core/mesoporous shell structure containing a Au nanoparticle within the core, subsequent ethylene chemical vapor deposition (CVD), and then removal of the silica by treatment with aqueous HF. The Au@hmC-FeCo/GC has superparamagnetism and high saturation magnetization (29.2 emu g−1) at room temperature. It also shows a type IV sorption isotherm, typical for mesoporous carbon (pore diameter = 3.5 nm), thereby ensuring ready accessibility to the Au core by substrates. We have shown that the Au@hmC-FeCo/GC catalyses the reduction of 4-nitrophenol and 4-nitrotoluene more efficiently than Au nanoparticles do, can be separated very quickly from the reaction mixture using an magnet, and can be reused for the same reduction reaction at least five times without loss of the initial level of catalytic activity.

show abstract

Tadpole‐Like Carbon Nanotube with Fe Nanoparticle Encapsulated at the Head and Zn Single‐Atom Anchored on the Body: One‐Pot Carbonization for Tetramodal Synergistic Cancer Therapy

Zhang,

Lu,

Gong

et al. 2024

Small

View full text Add to dashboard Cite

Precise integration of diverse therapeutic approaches into nanomaterials is the key to the development of multimodal synergistic cancer therapy. In this work, tadpole‐like carbon nanotubes with Fe nanoparticle encapsulated at the head and Zn single‐atom anchored on the body (Fe@CNT‐Zn) is precisely designed and facilely prepared via one‐pot carbonization. In vitro studies revealed the integration of chemotherapy (CT), chemodynamic therapy (CDT), photothermal therapy (PTT), and photodynamic therapy (PDT) in Fe@CNT‐Zn as well as the near‐infrared light (NIR)‐responsive cascade therapeutic efficacy. Furthermore, in vivo studies demonstrated the NIR‐triggered cascade‐amplifying synergistic cancer therapy in a B16 tumor‐bearing mouse model. The results not only showcased the Fe@CNT‐Zn as a potential tetramodal therapeutic platform, but also demonstrated a proof‐of‐concept on metal–organic framework‐based “one stone for multiple birds” strategy for in situ functionalization of carbon materials.

show abstract

Covalent Functionalization of FeCo/Graphitic Shell Nanocrystals via 1,3‐Dipolar Cycloaddition

Cited by 4 publications

References 43 publications

Preparation of Bio‐Inspired Melanin Nanoplatforms Chelated with Manganese Ions as a Potential T1 MRI Contrast Agent

Preparation of Bio‐Inspired Melanin Nanoplatforms Chelated with Manganese Ions as a Potential T1 MRI Contrast Agent

Au nanoparticle@hollow mesoporous carbon with FeCo/graphitic shell nanoparticls as a magnetically recyclable yolk–shell nanocatalyst for catalytic reduction of nitroaromatics

Tadpole‐Like Carbon Nanotube with Fe Nanoparticle Encapsulated at the Head and Zn Single‐Atom Anchored on the Body: One‐Pot Carbonization for Tetramodal Synergistic Cancer Therapy

Contact Info

Product

Resources

About