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209651

Sigma-Aldrich

Selenium

powder, −100 mesh, ≥99.5% trace metals basis

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About This Item

Formula empirica (notazione di Hill):
Se
Numero CAS:
7782-49-2
Peso molecolare:
78.96
Numero CE:
231-957-4
Numero MDL:
MFCD00134090
Codice UNSPSC:
12161600
ID PubChem:
24852584
NACRES:
NA.23

Descrizione

gray

Saggio

≥99.5% trace metals basis

Stato

powder

Impiego in reazioni chimiche

reagent type: catalyst
core: selenium

Resistività

1.2 μΩ-cm, 0°C

Dimensione particelle

−100 mesh

P. ebollizione

684.9 °C (lit.)

Punto di fusione

217 °C (lit.)

Densità

4.81 g/mL at 25 °C (lit.)

Stringa SMILE

[Se]

InChI

1S/Se
BUGBHKTXTAQXES-UHFFFAOYSA-N

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Descrizione generale

Selenium powder is a fine, powdery substance made up of small particles of the element selenium, often produced by the reduction of selenium oxide. Selenium powder is grey or silvered-colored and may have a metallic sheen that may appear reddish in color. This product is passed through a 100-mesh sieve, indicating that the particles are small and have a diameter of around 150 micrometers or less, and ensuring the powder is fine and easy-to-handle.

Applicazioni

Se is used in the synthesis of CdSe, which is consequetively used to modulate the photoresponse of quantum dot solar cells by varying the size and shape of semiconductor nanostructures.

Pittogrammi

Skull and crossbonesHealth hazard
GHS06,GHS08

Avvertenze

Danger

Indicazioni di pericolo

H301 + H331,H373,H413

Classi di pericolo

Acute Tox. 3 Inhalation - Acute Tox. 3 Oral - Aquatic Chronic 4 - STOT RE 2

Codice della classe di stoccaggio

6.1C - Combustible acute toxic Cat.3 / toxic compounds or compounds which causing chronic effects

Classe di pericolosità dell'acqua (WGK)

WGK 2

Punto d’infiammabilità (°F)

Not applicable

Punto d’infiammabilità (°C)

Not applicable

Dispositivi di protezione individuale

Eyeshields, Faceshields, Gloves, type P2 (EN 143) respirator cartridges

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Certificati d'analisi (COA)

Lot/Batch Number
MKCQ8556
MKCP5181
MKCM4291
MKCK8052
MKCK1764

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István Robel et al.
Journal of the American Chemical Society, 128(7), 2385-2393 (2006-02-16)
By using bifunctional surface modifiers (SH-R-COOH), CdSe quantum dots (QDs) have been assembled onto mesoscopic TiO(2) films. Upon visible light excitation, CdSe QDs inject electrons into TiO(2) nanocrystallites. Femtosecond transient absorption as well as emission quenching experiments confirm the injection
Daniel D Karp et al.
Journal of clinical oncology : official journal of the American Society of Clinical Oncology, 31(33), 4179-4187 (2013-09-05)
Selenium has been reported to have chemopreventive benefits in lung cancer. We conducted a double-blind, placebo-controlled trial to evaluate the incidence of second primary tumors (SPTs) in patients with resected non-small-cell lung cancer (NSCLC) receiving selenium supplementation. Patients with completely
Waleed Alhazzani et al.
Critical care medicine, 41(6), 1555-1564 (2013-04-17)
Patients with sepsis syndrome commonly have low serum selenium levels. Several randomized controlled trials have examined the efficacy of selenium supplementation on mortality in patients with sepsis. To determine the efficacy and safety of high-dose selenium supplementation compared to placebo
Claire M Weekley et al.
Nutrients, 5(5), 1734-1756 (2013-05-24)
Determining the speciation of selenium in vivo is crucial to understanding the biological activity of this essential element, which is a popular dietary supplement due to its anti-cancer properties. Hyphenated techniques that combine separation and detection methods are traditionally and
Kai-Oliver Feldmann et al.
Chemistry (Weinheim an der Bergstrasse, Germany), 21(27), 9697-9712 (2015-05-12)
Although a fairly large number of binary group 15/16 element cations have been reported, no example involving phosphorus in combination with a group 16 element has been synthesized and characterized to date. In this contribution is reported the synthesis and structural characterization
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