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Scanning electron microscopy image of MF particles
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Melamine Resin Particles: Physical and Chemical Properties
- Density: 1.51 g/cm3
- Refractive Index: 1.68
- Excellent monodispersity (C.V. <3 %) and highly uniform spherical shape
- Hydrophilic cationic surface (surface charge pH-dependent)
- High crosslinking density
- High temperature stability up to 300°C
- Superior mechanical strength
- Stable and insoluble in acids and bases
- Extremely high stability in organic solvents, no swelling or shrinking of the particles upon contact with organic solvents
- Outstanding long-term stability in dispersions, no additives or stabilizers required
- Freeze - thaw stability in water
- Particles can be dried directly from their aqueous dispersions
- Free-flowing powders of dried particles can be redispersed in any dispersing agent without agglomeration
- Available sizes: 300 nm - 12 µm
Outstanding characteristics of fluorescent MF particles are their narrow size distribution and an intense color and fluorescence. The homogeneously volume-stained particles have no leaching of the internally incorporated fluorochromes. Like white MF particles they show high stability in organic solvents. Fluorescent MF beads are also available with COOH-functionalized surfaces with a high density of functional groups (>0.1 mmole per gram resin).
As customer-specific preparations, our MF particles can also be manufactured as weakly crosslinked HCl-dissolvable species for certain applications. We prepare these monodisperse specialty particles in the size range 0.5 ... 7 microns as plain beads in aqueous dispersions. Fluorescent labels are possible. Please inquire for details and handling instructions.
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TEM image of 470 nm PS particles (Photograph by courtesy of Max Planck Institute of Colloids and Interfaces)
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Poly(styrene) Particles: Physical and Chemical Properties
- Density: 1.05 g/cm3
- Refractive Index: 1.59
- High monodispersity and uniform spherical shape
- Hydrophobic anionic surface
- Non-specific adsorption of proteins
- Low temperature resistance up to 100°C
- Soluble in organic solvents (dependent on the degree of cross-linking)
- Swellable in organic solvents
- Coefficient of Variation (C.V. value) of <3 %
for research grade particles and for particle size standards
- Available sizes: 100 nm - 1000 µm
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Optical microscopy image of 60 µm PMMA-Particles
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Poly(methyl methacrylate) Particles: Physical and Chemical Properties
- Density: 1.19 g/cm3
- Refractive Index: 1.48
- Hydrophilic anionic surface
- Individually tunable sizes of the particles in dependence on the desired application
- Extremely narrow size distribution
- Excellent biocompatibility
- Good mechanical stability
- Soluble in organic solvents like acetone, benzene, or halogenated hydrocarbons
- Reduced non-specific protein binding activity
- Available sizes: 300 nm - 1000 µm
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Highly ordered 2D array of 7µm SiO2 particles
(Optical microscopy, Olympus BX 40, scale bar 50µm)
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Silica Particles: Physical and Chemical Properties
- Density: 1.8-2 g/cm3
- Refractive Index: 1.42
- Hydrophilic anionic surface
- Narrow size distribution
- Temperature resistance up to 1000°C
- Good mechanical stability
- Stable in organic solvents
- Soluble in strong bases and in hydrofluoric acid
- Available sizes: 150 nm - 8 µm
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