Glass bubble,Hollow glass microspheres , Glass sphere beads, Manufacturer & suppliers

High quality hollow glass microspheres for research and development are always in high demand.? In an effort to better serve scientists Cospheric recently added a complete line of high quality borosilicate microspheres, and microbeads.

Borosilicate hollow glass microspheres offers? advantages over standard soda lime glass microbeads.

The high roundness, and low thermal expansion make borosilicate hollow glass microspheres an excellent candidate for use as spacers in epoxy bond lines, or other applications which require stability over a wide temperature range.

Borosilicate hollow glass microspheres are now offered in narrow size ranges from 0.03mm to 0.2mm with greater than 90% of the particles in range.

This article comes from microspheres edit released

Here only microspheres and microbubbles made in amorphous materials, namely in oxide or chalcogenide glasses and in amorphous polymers, will be considered. For the sake of completeness, however, it should be noted that many other materials, either natural or synthetic, can be used to fabricate Ms&Mb for different applications.

A few examples include stainless steel microspheres (for conductive spacers, shock absorption, and micromotor bearings); metallic nickel hollow glass microspheres (enhanced magnetic properties; Ni/Pt bimetallic microbubbles have potential applications in portable hydrogen generation systems, due to catalytic properties); single-crystal ferrite microspheres (for applications not only as magnetic materials but also in ferroflfluid technology and in biomedical fifields, e.g., biomolecular separations, cancer diagnosis and treatment, magnetic resonance imaging); single-crystal semiconductor microspheres (for active WGM resonators); ceramic ZrO2 hollow glass microspheres (for thermal applications).

Glass, polymer, ceramic, metal solid and hollow glass microspheres are commercially available; there is a wide choice of quality, sphericity (Sphericity was defifined in 1935 by the geologist H. Wadell, with reference to quartz particles (J. Geology 1935, 43, 250) as the ratio of the surface area of a sphere (with the same volume as the given particle) to the surface area of the particle), uniformity, particle size and particle size distribution, to allow the optimal choice for each unique application.

Hollow glass microspheres have a high density of about 2.2g/cc for borosilicate glass spheres, 2.5g/cc for soda lime glass spheres, and 4.49g/cc for barium titanate glass spheres. Hollow glass microspheres have densities as low as 0.14 g/cc.Depending on the application requirements, solvents used, desired buoyancy, difference in density between polyethylene and glass microspheres might become a critical factor when selecting the right material.

Hollow glass microspheres have the highest crush strength. Hollow glass microspheres have the lowest crush strength, which varies widely with the grade of material, density, sphere diameter, shell thickness.

Hollow glass microsphere imparts visual and material benefits that cannot be replicated when spheres are made of other materials such as ceramics or polymerics, aluminum oxides, or silicas and mineral fillers. Solid glass refracts, bends and reflects light. Most ceramics do not transmit light or exhibit mirror-like reflection due to their internal crystalline structures and surface irregularities. Instead of being reflected back, the light is “trapped” in the structure and emitted as diffuse or scattered reflectance, which is not as strong or direct as light transmitted through glass, which produces mirror-like reflectance. Hollow glass microsphere can also possess numerous surface and interior micro irregularities that also diffuse light. Because the thickness of a hollow bead’s wall is inversely proportional to its diameter, however, the larger hollow glass microsphere that might offer some reflective properties have very low crush strengths, which precludes their incorporation into most formulations.

Hollow glass microspheres, also called glass beads, provide multiple benefits including enhanced processing, excellent chemical and heat resistance, thermal stability, low oil absorption, and are used in automotive, electrical, household appliance, adhesives, packaging, paint and construction industries. Glass is non-toxic, extremely stable and recyclable. Hollow glass microspheres are inert and are not nanoparticles and therefore do not raise the regulatory and other concerns of sub-micron-size materials.

This article comes from cospheric edit released

Hollow Glass Microspheres are advanced, low-density additives used in a variety of industrial applications. They are available in a wide range of densities and crush strengths, including our newest glass microsphere.

Performance Additive iM30K, capable of surviving most compounding and molding processes. These hollow glass microspheres of soda-lime/borosilicate glass are water insoluble, chemically stable and offer a high strength-to-weight ratio.

This article comes from castro edit released

Microspheres are spherical particles that can be distinguished into two categories; solid or hollow glass microspheres typical ranges from 1 to 200 μm in diameter. Both solid and hollow glass microspheres can be produced from glass, ceramic, carbon or plastic. Solid glass microspheres are usually made from soda-lime glass due to the low melting point and chemical inertness of soda-lime glass. The conventional method in producing solid glass microspheres is by the In-Flame Spheroidisation Method where a continuous controlled flow of powdered glass is feed to a gas flame. In contrast, hollow glass microspheres are produced by adding a blowing agent to glass powder.

Blowing agent such as sodium silicate decomposes to multiple gases when burned, causing the microsphere to form with a hollow structure. Hollow glass microspheres applications as fillers in syntactic foams resulting in reduction of material density, compaction and heat conductivity. Developed Vertical Thermal Flame (VTF) process has potential to produce cenosphere from fly ash with high yields.

In the VTF process, the raw materials are fed into a vertical tube via a funnel and the raw material will come in contact with the flame located at the bottom of the vertical tube. The burned particles are collected and cooled in a beaker via a collector plate before proceeding to the particle characterization study.

This article comes from iopscience edit released

Hollow glass microspheres are a family of high-strength, low-density additives used in a variety of industrial applications. It’s perfectly ok for lighter plastic and rubber made products for transportation industry.

Because of their spherical shape, hollow glass microspheres behave like tiny ball bearings, causing them to flow within a liquid polymer much better than common mineral fillers.

In addition, the spherical shape improves the dimensional stability of the polymer composite, resulting in less shrinkage and warpage.

Hollow glass microspheres are compatible with most thermoplastics, including polypropylene, nylon, ABS and others, which shows good advantages below :

1. reduce specific gravity

2. reduce VOC

3. reduce shrinkage and warping, keep the dimensional ability

4. improve thermal insulation and noise rduction performance

5. improve the rigidity of the material

This article comes from hollowlite edit released

Novel thermal insulation material consisting of a frame work of hollow glass microspheres and embedded silica aerogel was prepared by allowing silica sol to penetrate into HGM ceramics, followed by drying under ambient pressure. hollow glass microspheres porous ceramics were obtained after sintering of closed packed HGMs together. Properties such as density, porosity, compressive strength, thermal conductivity (λ), and microstructure of each specimen prepared at different temperatures were systematically studied.

Results showed that hollow glass microspheres ceramics had lower density ranging from 0.136 to 0.701 g/cm₃. The density, compressive strength, and λ of hollow glass microspheres ceramic increased with increase in sintering temperature and true density of hollow glass microspheres. After filling hollow glass microspheres ceramic with silica aerogel, thermal conductivity was reduced by about 27%. Moreover, the introducing of aerogel changed the mode of thermal conduction of the composite by reducing heat transfer of air between hollow glass microspheres. The composite showed super-hydrophobicity (contact angle >150°) due to the presence of organic methyl groups.

Silica aerogel/hollow glass microspheres ceramics with low density and low thermal conductivity prepared by embedding of silica aerogel into hollow glass microspheres ceramic, not only overcame the disadvantage of large-size aerogel materials during fabrication, but also solved the problem of high water absorption of inorganic materials.

This article comes from x-mol edit released

Hollow glass microspheres made of glass, polymer, or crystal material have been largely used in many application areas, extending from paints to lubricants, to cosmetics, biomedicine, optics and photonics, just to mention a few.

Here the focus is on the applications of hollow glass microspheres in the field of energy, namely covering issues related to their use in solar cells, in hydrogen storage, in nuclear fusion, but also as high-temperature insulators or proppants for shale oil and gas recovery.

An overview is provided of the fabrication techniques of bulk and hollow glass microspheres, as well as of the excellent results made possible by the peculiar properties of hollow glass microspheres. Considerations about their commercial relevance are also added.

Porous hollow glass microspheres have many uses, including porosity enhancers for lead-acid batteries. A fast, facile and high yield synthetic method for fabricating porous hollow glass microspheres with diameters around 45–55 μm is demonstrated. The process involves shaking commercially available hollow glass microspheres in dilute hydrofluoric acid for 20 min. This process yielded two pore morphologies by using different commercially available starting materials; Yields were 33% and 40%, respectively. The simplicity of the reported fabrication technique has the potential to be scaled up for large scale production.

Applications:

• Porous hollow glass microspheres are synthesized for use as battery additives.
• A simple fabrication method with commercial hollow glass microsphere precursors.
• Sponge-like submicron pores or straight through micron pores created.
• Yields were 33–40%.

This article comes from sciencedirect edit released

Porous-wall hollow glass microspheres are a novel form of glass material consisting of a 10 to 100 micron-diameter hollow central cavity surrounded by a 1 micron-thick silica shell. A tortuous network of nanometer-scale channels completely penetrates the shell.

We show here that these channels promote size-dependent uptake and controlled release of biological molecules in the 3–8 nm range, including antibodies and a modified single-chain antibody variable fragment (scFv). In addition, a 6 nm (70 kDa) dextran can be used to gate the porous walls, facilitating controlled release of an internalized small interfering RNA.

Porous-wall hollow glass microspheres remained in place after mouse intratumoral injection, suggesting a possible application for the delivery of anti-cancer drugs. The combination of a hollow central cavity that can carry soluble therapeutic agents with mesoporous walls for controlled release is a unique characteristic that distinguishes porous-wall hollow glass microspheres from other glass materials for biomedical applications.

This article comes from ncbi edit released