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Table 3 FTIR Analysis of BSO ester

From: The rheological and filtration properties of black seed (Nigella Sativa L.) ester as a base fluid in drilling fluid

Functional Group

Strength of band

Peak Value (cm−1)

Bond

Ester group

Strong

1743.38

C = O stretch

Alcohol group, hydrogen bonding

Broad and Strong

3389.64

O–H stretch

Primary Amine

Medium

3464.99

N–H stretch

Alkene, Aromatic group

Weak to Medium

3003.74

 = C-H stretch

Alkene

Weak to Medium

1654.48

C = C stretch

Alkane

Strong

723.46

-C-H stretch

Alkane

Medium to Strong

2924.87

-C-H stretch

Alkane

Medium

2853.33

-C-H stretch

Acid

Medium

1252.22

C-O stretch