乾燥剤シリカゲルとは

乾燥剤シリカゲルとは?

Silica gel is anamorphous そしてporous form ofsilicon dioxide (シリカ), consisting of an irregular tridimensional framework of alternatingsilicon そして酸素 atoms withnanometer-scale voids and pores. 空隙には水またはその他の液体が含まれる可能性があります, or may be filled by gas orvacuum. 最後の場合, この材料は正しくはシリカキセロゲルと呼ばれます.

平均細孔径のシリカキセロゲル 2.4 nanometers has a strong affinity for water molecules and is widely used as adesiccant. It is hard andtranslucent, but considerably softer than massivesilica glass orquartz; 水を含むと硬さを保ちます.

シリカキセロゲルは通常、粗粒またはビーズとして商品化されます。, a fewmillimeters in diameter. 一部の穀物には、水分を吸収すると色が変わる少量の指示薬が含まれている場合があります。. シリカキセロゲルペレットが入った小さな紙封筒, 通常は “食べないでください” 警告, are often included in dry food packages to absorb anyhumidity that might causespoilage of the food.

‘Wet’ silica gel, as may be freshly prepared fromアルカリ silicate solutions, may vary in consistency from a soft transparentgel, similar togelatin oragar, to a hard solid, namely a water-logged xerogel. It is sometimes used in laboratory processes, for example to suppressconvection in liquids or preventsettling of suspended particles

Types

· Type A – clear pellets, approximate pore diameter: 2.5 nm, drying and moistureproof properties, can be used as catalyst carriers, adsorbents, separators and variable-pressure adsorbent.

· Type B – translucent white pellets, pore diameter: 4.5⁠–⁠7.0 nm, liquid adsorbents, drier and perfume carriers, also may be used as catalyst carriers, cat litter.

· Type C – translucent, micro-pored structure, raw material for preparation of silica gel cat litter. Additionally dried and screened, it forms macro-pored silica gel which is used as drier, adsorbent and catalyst carrier.

Silica alumina gel – light yellow, chemically stable, flame-resistant, insoluble except in alkali or hydrofluoric acid. Superficial polarity, thermal stability, performance greater than fine-pored silica gel.

Stabilizing silica gel – non-crystalline micro-porous solid powder, nontoxic, flame-resisting, used in brewery of grains for beer to improve taste, clearness, color, and foam and for removal of non-micro-organism impurities.