Journal ArticleDOI
Stable Colloidal Dispersions of Fullerenes in Polar Organic Solvents
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TLDR
The measured negative values for the electrophoretic mobility of the particles suggest that fullerene dispersions in polar organic solvents are stabilized by repulsive electrostatic interactions.Abstract:
Colloidal dispersions of C60 and C70 were prepared by simply mixing a fullerene solution in a good solvent with a poor polar organic solvent for fullerenes. The process was very easy and fast and the formation of particles with average diameter in the colloidal range was detected immediately after the components were mixed. The formation and the properties of the fullerene particles were studied mainly with dynamic light scattering and high-resolution transmission electron microscopy. The most interesting findings are the long-term colloid stability of the samples in the absence of any stabilizers, the relatively narrow size distribution, and the different average sizes of the particles formed by C60, C70, and their mixtures. The influence of various factors such as fullerene concentration, mixing procedure, solvent properties, and C60/C70 ratio was investigated. It is shown that the smaller particles are formed when the total fullerene concentration in the good solvent is decreased and that the fullerene...read more
Citations
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The potential environmental impact of engineered nanomaterials
TL;DR: With the increased presence of nanomaterials in commercial products, a growing public debate is emerging on whether the environmental and social costs of nanotechnology outweigh its many benefits.
Journal ArticleDOI
Recent Progress in Polymer Solar Cells: Manipulation of Polymer:Fullerene Morphology and the Formation of Efficient Inverted Polymer Solar Cells
TL;DR: In this article, a review of polymer morphology is presented with respect to solvent selection and various annealing processes, which facilitates the formation of optimal percolation paths and therefore provides a simple approach to improve photovoltaic performance.
Journal ArticleDOI
Aggregation and deposition of engineered nanomaterials in aquatic environments: role of physicochemical interactions.
TL;DR: In this review, colloidal forces governing nanoparticle deposition and aggregation are outlined, and essential equations used to assess particle-particle and particle-surface interactions, along with Hamaker constants for specific nanoparticles and the attributes exclusive to nanoscale particle interactions, are described.
Journal ArticleDOI
Aggregation and deposition kinetics of fullerene (C60) nanoparticles.
Kai Loon Chen,Menachem Elimelech +1 more
TL;DR: The deposition of the fullerene nanoparticles was further shown to be mostly irreversible, with immediate detachment of the nanoparticles observed only when exposed to a solution of high pH, as was indicated in the aggregation kinetics results.
Journal ArticleDOI
C60 in water: nanocrystal formation and microbial response.
John D. Fortner,Delina Y. Lyon,Christie M. Sayes,Adina M. Boyd,J C Falkner,E M Hotze,Lawrence B. Alemany,Yizhi Jane Tao,W Guo,Kevin D. Ausman,Vicki L. Colvin,Joseph B. Hughes +11 more
TL;DR: The environmental fate, distribution, and biological risk associated with this important class of engineered nanomaterials will require a model that addresses not only the properties of bulk C60 but also that of the aggregate form generated in aqueous media.
References
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Journal ArticleDOI
Inhibition of the HIV-1 protease by fullerene derivatives: model building studies and experimental verification
TL;DR: The ability of C[sub 60] fullerene derivatives to interact with the active site of HIV-1 protease (HIVP) has been examined through model building and simple physical chemical analysis as discussed by the authors.
Journal ArticleDOI
Self-Assembled Aggregates of Rod-Coil Block Copolymers and Their Solubilization and Encapsulation of Fullerenes
Samson A. Jenekhe,X. Linda Chen +1 more
TL;DR: Amphiphilic poly(phenylquinoline)-block-polystyrene rod-coil diblock copolymers were observed to self-organize into robust, micrometer-scale, spherical, vesicular, cylindrical, and lamellar aggregates from solution, but their size scale decreased with a decreasing fraction of the rigid-rod block.
Journal ArticleDOI
A Novel Preparation Method of Organic Microcrystals
Hitoshi Kasai,Hari Singh Nalwa,Hidetoshi Oikawa,Shuji Okada,Hiro Matsuda,Nobutsugu Minami,Atsushi Kakuta,Katsumichi Ono,Akio Mukoh,Hachiro Nakanishi +9 more
TL;DR: In this article, a reprecipitation method was used to obtain organic microcrystals ranging from several tens nm to µm in size of several chromophores by simply dispersing ethanol solutions of compounds into stirred water.