A pH-switchable carrier composition includes a plurality of bioactive glass particles, wherein each of the bioactive glass particle is optionally at least a partially coated with a surface modifier; wherein the bioactive glass particles, with or without, the surface modifier can bind to a nucleic acid compound upon contact at pH in the range of about 7 to about 11, and exhibit controlled release of the nucleic acid compound at pH in the range of about 5 to 6.

A pH-switchable carrier composition includes a plurality of bioactive glass particles, wherein each of the bioactive glass particle is optionally at least a partially coated with a surface modifier; wherein the bioactive glass particles, with or without, the surface modifier can bind to a nucleic acid compound upon contact at pH in the range of about 7 to about 11, and exhibit controlled release of the nucleic acid compound at pH in the range of about 5 to 6.

The present invention relates to plasma-resistant glass containing 32-52 mol % of SiO.sub.2, 5-15 mol % of Al.sub.2O.sub.3, 30-35 mol % of CaO, and 0.1-15 mol % of CaF.sub.2 as chemical components, and a manufacturing method thereof. According to the present invention, a glass stability index K.sub.H is 2.0 or higher, and a plasma-resistant characteristic of an etch rate of lower than 10 nm/min for a mixed plasma of fluorine and argon (Ar) is exhibited.

The present invention relates to plasma-resistant glass containing 32-52 mol % of SiO.sub.2, 5-15 mol % of Al.sub.2O.sub.3, 30-35 mol % of CaO, and 0.1-15 mol % of CaF.sub.2 as chemical components, and a manufacturing method thereof. According to the present invention, a glass stability index K.sub.H is 2.0 or higher, and a plasma-resistant characteristic of an etch rate of lower than 10 nm/min for a mixed plasma of fluorine and argon (Ar) is exhibited.

Lithium silicate-diopside glass ceramics are described which are characterized by a controllable translucence and can be satisfactorily processed mechanically and therefore can be used in particular as restoration material in dentistry.

The present invention relates to a 3D printer printhead, a 3D printer using the same, a method for manufacturing a molded product by using the 3D printer, a method for manufacturing an artificial tooth by using the 3D printer, and a method for manufacturing a machinable glass ceramic molded product by using the 3D printer, the 3D printer printhead comprising: an inlet through which glass wire, which is a raw material, is introduced; a heating means for heating the glass wire introduced through the inlet; a melting furnace for providing a space in which the glass wire is fused; and a nozzle connected to the lower part of the melting furnace so as to temporarily store the fused glass or discharge a targeted amount of the fused glass, wherein the melting furnace includes an exterior frame made from a heat resistant material and an interior frame having a crucible shape, and the interior frame is made from platinum (Pt), a Pt alloy or graphite, which have a low contact angle, or a material having a surface coated with Pt or a diamond-like carbon (DLC) so as to prevent the fused glass from sticking thereto. According to the present invention, the molded product, the artificial tooth, and the machinable glass ceramic molded product can be manufactured with excellent mechanical properties, thermal durability, chemical durability and oxidation resistance and outstanding texture by using the glass wire as a raw material.

Provided is a glass composition for glass fiber having a low dielectric constant and a low dielectric loss tangent, suppressing occurrence of phase separation, and reducing viscosity at high temperatures. The glass composition for glass fiber includes: SiO.sub.2 in the range of 52.0 to 59.5% by mass; B.sub.2O.sub.3 in the range of 17.5 to 25.5% by mass; Al.sub.2O.sub.3 in the range of 9.0 to 14.0% by mass; SrO in the range of 0.5 to 6.0% by mass; MgO in the range of 1.0 to 5.0% by mass; and CaO in the range of 1.0 to 5.0% by mass, and includes F.sub.2 and Cl.sub.2 in the range of 0.1 to 2.5% by mass in total, with respect to the total amount.

Glass compositions suitable for fiber forming having low levels of Li.sub.2O and glass fibers having high-modulus are disclosed. The glass composition may include SiO.sub.2 from about 59 to about 63 weight percent, Al.sub.2O.sub.3 from about 13.7 to about 16 weight percent, CaO from about 14 to about 16.5 weight percent, MgO from about 6 to about 8.5 weight percent, Fe.sub.2O.sub.3 less than 1 weight percent, and TiO.sub.2 less than 1 weight percent. In some cases, the composition may be substantially free of Li.sub.2O. In some cases, the composition may include Li.sub.2O up to 0.5 weight percent. In some cases, RE.sub.2O.sub.3 may be present in the composition in an amount up to 1.5 weight percent. The glass compositions can be used to form glass fibers which can be incorporated into a variety of other fiber glass products (e.g., strands, rovings, fabrics, etc.) and incorporated into various composites.

Glass compositions suitable for fiber forming having low levels of Li.sub.2O and glass fibers having high-modulus are disclosed. The glass composition may include SiO.sub.2 from about 59 to about 63 weight percent, Al.sub.2O.sub.3 from about 13.7 to about 16 weight percent, CaO from about 14 to about 16.5 weight percent, MgO from about 6 to about 8.5 weight percent, Fe.sub.2O.sub.3 less than 1 weight percent, and TiO.sub.2 less than 1 weight percent. In some cases, the composition may be substantially free of Li.sub.2O. In some cases, the composition may include Li.sub.2O up to 0.5 weight percent. In some cases, RE.sub.2O.sub.3 may be present in the composition in an amount up to 1.5 weight percent. The glass compositions can be used to form glass fibers which can be incorporated into a variety of other fiber glass products (e.g., strands, rovings, fabrics, etc.) and incorporated into various composites.

Articles may be protected against halide plasma, by applying a rare earth-containing glaze to the surface of the article. The glaze may be a coating comprising; 20 to 90 mol % SiO.sub.2, 0 to 60 mol % Al.sub.2O.sub.3, 10 to 80 mol % rare earth oxides and/or rare earth fluorides (REX), wherein SiO.sub.2+Al.sub.2O.sub.3+REX≥60 mol %.