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001-es BibID:	BIBFORM057170
Első szerző:	Kéri Mónika (környezetkutató vegyész)
Cím:	NMR Characterization of PAMAM_G5.NH2 Entrapped Atomic and Molecular Assemblies / Mónika Kéri, Chen Peng, Xiangyang Shi, István Bányai
Dátum:	2015
ISSN:	1520-6106
Megjegyzések:	High resolution NMR spectroscopy, NMR diffusiometry and NMR cryoporometry have been used to investigate aqueous solution (D2O) of PAMAM_G5.NH2-(Au)25-100 and PAMAM_G5.NH2-(H2O)1000 - (H2O)4000 systems. In case of dendrimer entrapped gold nanoparticles the detailed analysis of high resolution NMR spectra has shown that no precursor complex formation happens under the circumstances applied for reduction. Further PGSE results verify that gold nanoparticles of 1.9-2.6 nm size are entrapped in the outermost part of the dendrimers and probably more than one dendrimer molecule take part in the stabilization process. This system looks like a transition state between dendrimer encapsulated nanoparticles (DENs) and dendrimer stabilized nanoparticles (DSNs) and we deal in details what it means. NMR cryoporometry experiments were performed to detect the encapsulation of water molecules. The results show that in the swelling PAMAM_G5.NH2 dendrimers, by adding water step by step, there are specific cavities for water with diameter of 3.6 and 5.2 nm. These cavities have penetrable wall for water molecules and probably exist very close to the terminal groups. The permeability of the cavities is increasing with the increase of the water content. In dilute solution the formation of nanoparticles is determined by the ratio of the rate of nucleation and aggregation and this latter is affected by the PAMAM_G5.NH2.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban poli(amido-amine) dendrimerek arany nanorészecskék NMR diffúziometria NMR krioporometria stabilizálás kapszulázás
Megjelenés:	The Journal of Physical Chemistry B. - 119 : 7 (2015), p. 3312-3319. -
További szerzők:	Peng, Chen Shi, Xiangyang Bányai István (1953-) (vegyész)
Internet cím:	Intézményi repozitóriumban (DEA) tárolt változat DOI
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