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231223s2009 xx |||||o 00| ||eng c |
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|a 10.1021/la9017932
|2 doi
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|a pubmed24n0637.xml
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|a DE-627
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|e rakwb
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| 041 |
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|a eng
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| 100 |
1 |
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|a Wang, Zhining
|e verfasserin
|4 aut
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| 245 |
1 |
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|a Studies of dipalmitoylphosphatidylcholine (DPPC) monolayers embedded with endohedral metallofullerene (DyC82)
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|c 2009
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|a Text
|b txt
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|a ƒaComputermedien
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|a Date Completed 21.01.2010
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|a Date Revised 10.11.2009
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|a published: Print
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|a Citation Status PubMed-not-MEDLINE
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|a Toxicological effects of carbon nanomaterials have attracted increasing attention. In this work, we studied the interaction between DyC(82) and dipalmitoylphosphatidylcholine (DPPC) in a monolayer at the N(2)/Tris buffer interface by thermodynamic analysis of surface pressure-area (pi-A) and surface potential-area (DeltaV-A) isotherms. Dy@C(82) was found to impact considerably more on the physical properties of the monolayers than C(60) because of its elliptical structure and distinctive dipole. The addition of Dy@C(82) essentially closed down the liquid expanded-liquid condensed (LE-LC) phase coexistence region of the mixed monolayers. Furthermore, Dy@C(82) reduced elasticity of the monolayers, as indicated by the decreasing elastic modulus (C(s)(-1)) with increasing molar ratio of Dy@C(82) (X(Dy@C82)). Brewster angle microscopy (BAM) and atomic force microscopy (AFM) revealed that the dispersion of Dy@C(82) depend on the state of the mixed films. Dy@C(82) formed flocs from aggregation of Dy@C(82) towers in the LE and LE-LC coexistence regions, accompanied by gradual falling down of Dy@C(82) from the towers and permeation of the falling metallofullerenes into the LE phase during their compression-induced reorientation process. In the LC and solid phases, the Dy@C(82) flocs were dispersed into isolated towers, accompanied by the partial squeezing out of the embedded metallofullerenes to above the DPPC monolayer. The continuous falling down of Dy@C(82) from the towers resulted in their height decrease but diameter enlargement. When the surface pressure was increased to the kink value (53 mN/m), Dy@C(82) was almost completely extruded from the DPPC monolayers. These findings are believed to be important for understanding the impact of fullerenes, metallofullerenes, and nanomaterials in general on biological membranes
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|a Journal Article
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1 |
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|a Li, Xiaofang
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Yang, Shihe
|e verfasserin
|4 aut
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| 773 |
0 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 25(2009), 22 vom: 17. Nov., Seite 12968-73
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|x 1520-5827
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| 773 |
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|g volume:25
|g year:2009
|g number:22
|g day:17
|g month:11
|g pages:12968-73
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| 856 |
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|u http://dx.doi.org/10.1021/la9017932
|3 Volltext
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