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S5505

Sigma-Aldrich

气相二氧化硅

powder, 0.2-0.3 μm avg. part. size (aggregate)

同義詞:

二氧化硅, 无定形二氧化硅, 氧化硅, 硅酐

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About This Item

線性公式:
SiO2
CAS號碼:
112945-52-5
分子量：:
60.08
MDL號碼:
MFCD00011232
分類程式碼代碼:
12352103
PubChem物質ID:
24899656
NACRES:
NA.22
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形狀

powder

表面積

200 m2/g (±25 m2/g)

折射率

n20/D 1.46 (lit.)

樣品平均尺寸

0.2-0.3 μm (aggregate)

密度

2.3 lb/cu.ft at 25 °C (bulk density)(lit.)

SMILES 字串

O=[Si]=O

InChI

1S/O2Si/c1-3-2

InChI 密鑰

VYPSYNLAJGMNEJ-UHFFFAOYSA-N

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應用

气相二氧化硅（SiO2）作为前体已被于：
  • 通过硅烷化合成氯硅烷，其可用于制备二氧化硅/聚二甲基硅氧烷膜，以研究渗透性能。[1]
  • 通过溶胶-凝胶法合成碳化硅（SiC）纳米颗粒。[2]
  • 通过水热反应利用CaO和水处理，合成水合硅酸钙（CSH）。[3]
  • 合成Si/PtO2催化剂，从而通过好氧氧化将肉桂醛选择性转化为肉桂酸。[4]


它也可以用于制备：
  • 硅硫酸催化剂，其可通过一锅三组分Biginelli反应用于合成3,4-二氢嘧啶-2（1H）-酮。[5]
  • 用于合成四取代咪唑的HClO4-SiO2 非均相催化剂。[6]

特點和優勢

具有令人感兴趣的增稠性、触变性以及巨大的外表面积。

其他說明

粒径是针对初级粒子，它们形成支链状聚集体，仅长零点几微米。

儲存類別代碼

11 - Combustible Solids

水污染物質分類（WGK）

WGK 2

閃點（°F）

Not applicable

閃點（°C）

Not applicable

個人防護裝備

Eyeshields, Gloves, type N95 (US)

從最近期的版本中選擇一個：

分析證明 (COA)

Lot/Batch Number
0000406833
0000405226
0000405227
0000396311
0000396312

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Questions

1–3 of 3 Questions  

  1. How is shipping temperature determined? And how is it related to the product storage temperature?

    1 answer

    1. Products may be shipped at a different temperature than the recommended long-term storage temperature. If the product quality is sensitive to short-term exposure to conditions other than the recommended long-term storage, it will be shipped on wet or dry-ice. If the product quality is NOT affected by short-term exposure to conditions other than the recommended long-term storage, it will be shipped at ambient temperature. As shipping routes are configured for minimum transit times, shipping at ambient temperature helps control shipping costs for our customers. For more information, please refer to the Storage and Transport Conditions document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/316/622/storage-transport-conditions-mk.pdf

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  2. How can I determine the shelf life / expiration / retest date of this product?

    1 answer

    1. If this product has an expiration or retest date, it will be shown on the Certificate of Analysis (COA, CofA). If there is no retest or expiration date listed on the product's COA, we do not have suitable stability data to determine a shelf life. For these products, the only date on the COA will be the release date; a retest, expiration, or use-by-date will not be displayed.
      For all products, we recommend handling per defined conditions as printed in our product literature and website product descriptions. We recommend that products should be routinely inspected by customers to ensure they perform as expected.
      For products without retest or expiration dates, our standard warranty of 1 year from the date of shipment is applicable.
      For more information, please refer to the Product Dating Information document: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/marketing/global/documents/449/386/product-dating-information-mk.pdf

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  3. is this hydrophobic

    1 answer

    1. This product is hydrophilic. Please see the data sheet for more information: https://www.sigmaaldrich.com/deepweb/assets/sigmaaldrich/product/documents/246/034/s5505pis.pdf

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