Carboxylation and Decarboxylation of Aluminum Oxide Nanoparticles Using Bifunctional Carboxylic Acids and Octylamine

Table 4

Energy dispersive X-ray (EDX) analysis (atom% ±1.5) of the various carboxylic acid functionalized NPs after reaction with octylamine.

Reaction	Temp. (°C)	C	Al	O	N	C : Al
Lysine NPs + octylamine	25	28.8	26.1	44.5	0.5	1.1
	70	4.9	31.9	60.9	0.5	0.15
p-Hydroxybenzoic acid NPs + octylamine	25	10.4	28.7	60.7	0.1	0.36
	70	7.7	30.8	60.7	0.6	0.25
Fumaric acid NPs + octylamine	25	32.0	20.4	47.1	0.5	1.56
	70	31.8	19.0	48.9	0.6	1.67
4-Formylbenzoic acid NPs + octylamine	25	2.9	41.12	55.9	—	0.07
	70	2.8	31.1	66.3	0.4	0.09