Flare (countermeasure) - Wikipedia
A flare or decoy flare is an aerial infrared countermeasure used by an aircraft to counter an infrared homing ("heat-seeking") surface-to-air missile or air-to-air missile. Flares are commonly composed of a pyrotechnic composition based on magnesium or another hot-burning metal, with burning temperature equal to or hotter than engine exhaust.
Safer-emergency-flares-thanks-less - Chemical & Engineering …
2016年11月21日 · Many emergency flares rely on a material called red phosphorus, one of the natural forms of the element, to produce billowing smoke that draws the rescuers’ attention. Researchers have been seeking an alternative because red phosphorus has multiple safety flaws.
红磷 - 维基百科，自由的百科全书
紅磷 是 磷 的一種 同素異形體，因呈紅色而得名。 把 白磷 加熱至 250°C 或暴露於陽光下一段時間即可獲得紅磷。 紅磷的結構屬多分子不規則排列。 性质. 红磷易燃，燃烧生成 五氧化二磷。 红磷可以和 乙醇钾 在 有机溶剂 中反应，得到多磷阴离子。 [3] 用途. 红磷-碘. 红磷和 碘 可用作 三碘化磷 的替代物用于有机物的碘化反应，例如将 醇 转化为相应的 碘代烃： [4] R-OH — P, I2 → R-I. 这一 试剂 也是 有机合成 中常用的 还原剂，如用于 羰基 [5] 、 磺酰氯 [6] 还原。 制备磷化物. 磷 …
How To Obtain Red Phosphorus - Sciencing
2018年12月14日 · Red phosphorus, a relatively stable allotrope of phosphorus, has many uses. For example, it's a component of fireworks, flares and matches; it's used to dope silicon; and it's a plant fertilizer. You can obtain it by boiling urine with carbon or by reacting bone-ash with sulfuric acid and carbon.
Red phosphorus - Wikipedia
Red phosphorus is an allotrope of phosphorus. It is an amorphous polymeric red solid that is stable in air. It can be easily converted from white phosphorus under light or heating. It finds applications as matches and fire retardants. It was discovered in 1847 by Anton von Schrötter. [1] Structure. Red phosphorus is an amorphous form of phosphorus.
Red Phosphorus - Structure, Properties, Production, and Uses
Red phosphorus is one of the most common allotropes of phosphorus and is considered to be a derivative of the P 4 molecule. It exists in an amorphous (non-crystalline) network of phosphorus atoms. It is found to be more stable than white phosphorus (another naturally occurring phosphorus allotrope). Red phosphorus is characterized by its deep ...
Phosphorus | Elements | RSC Education
Phosphorus can be obtained as white phosphorus (P 4) or red phosphorus (P n): the latter made by heating white phosphorus in a closed vessel. This converts a form that is flammable, deadly and glows in the dark, into one that has none of these features.
Chemical compositions typically used in red flares.
Typical red flare compositions described in the literature contain around 30-40 % of Mg powder, 55-35 % of Sr(NO 3 ) 2 , 12-20 % of chlorine donor and 4-10 % of other additives such as...
红磷 - 百度百科
红磷（Red phosphorus）又名赤磷，为紫红色无定形粉末，有光泽，无毒。. 高压下热至590℃开始熔化，若不加压则不熔化而升华，汽化后再冷凝则得白磷。. 红磷以P4四面体的单键形成链或环的高聚合结构，具有较高的稳定性，不溶于水、二硫化碳，微溶于无水乙醇 ...
Red Phosphorus: An Up-and-Coming Photocatalyst on the …
2021年12月30日 · More notably, the renowned red allotrope of the phosphorus family is spectacularly bestowed with strengthened optical absorption features, propitious electronic band configuration, and ease of functionalization and modification as well as high stability.