Cetrimonium bromide

Catalog Number	ACM57090-3
CAS	57-09-0
Structure
Synonyms	1-Hexadecanaminium, N,N,N-trimethyl-, bromide;Cetyl trimethyl ammonium bromide;N,N,N-Trimethyl-1-hexadecanaminium bromide;CTAB;CETAB
IUPAC Name	Hexadecyl(trimethyl)azanium;bromide
Molecular Weight	364.45
Molecular Formula	C19H42BrN
Canonical SMILES	CCCCCCCCCCCCCCCC[N+](C)(C)C.[Br-]
InChI	LZZYPRNAOMGNLH-UHFFFAOYSA-M
InChI Key	InChI=1S/C19H42N.BrH/c1-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20(2,3)4;/h5-19H2,1-4H3;1H/q+1;/p-1
Melting Point	248-251 °C(lit.)
Purity	99%+
Density	1.11g/ml
Solubility	Soluble in water
Complexity	181
Covalently-Bonded Unit Count	2
Defined Atom Stereocenter Count	0
Exact Mass	363.25006
Form	Solid
Heavy Atom Count	21
Hydrogen Bond Acceptor Count	1
Hydrogen Bond Donor Count	0
Monoisotopic Mass	363.25006
pH	5-7
Physical State	Solid/Paste
Rotatable Bond Count	15
Topological Polar Surface Area	0 Ų

Knowledge & Learning Case Study Q&A

Influence of Cetrimonium Bromide on Gold Electrodeposition

Satpathy B, et al. Surfaces and Interfaces, 2023, 40, 103132.

In this study, the impact of cetrimonium bromide (CTAB), a quaternary ammonium surfactant, on the electrodeposition of gold (Au) from a non-cyanide electroplating solution was investigated. Incorporating CTAB in the electroplating bath enhances the microstructural properties and anti-tarnishing performance of Au coatings, making it a viable technique for improving gold electrodeposition outcomes.
Gold electrodeposition was carried out using pulse galvanostatic electroplating from solutions both with and without CTAB. Electrochemical studies revealed that the nucleation of Au is initially instantaneous in both solutions; however, in the presence of CTAB, the mechanism shifts to progressive nucleation at a later stage. In contrast, nucleation remained instantaneous in the absence of CTAB.
Scanning electron microscopy (SEM) and atomic force microscopy (AFM) analyses demonstrated that the presence of CTAB led to a fine-structured, compact, and uniform Au coating. X-ray diffraction (XRD) studies further indicated that CTAB influences the preferential growth of Au crystals. With CTAB, Au grew along the (111) lower index crystal surface, while in its absence, growth occurred along the (200) higher index surface.
The anti-tarnishing performance of the Au coatings was assessed through electrochemical impedance spectroscopy (EIS) and static immersion tests. These tests confirmed that Au coatings deposited with CTAB had superior resistance to tarnishing, as indicated by higher RPOL values and better visual glossiness retention. Density functional theory (DFT) calculations supported these findings by showing that Au coatings are less prone to tarnishing when the reduction of AuComplex to Au is controlled to favor the (111) plane.

Cetrimonium Bromide Used to Assist the Adsorption of Palladium by Amberlyst A21 Resin

Nagireddi S. Materials Today: Proceedings, 2022, 68, 830-835.

This study investigates the influence of cetrimonium bromide (CTAB), a cationic surfactant, on the palladium (Pd) sorption characteristics of Amberlyst A21 resin. The focus is on the adsorption process in a chemically complex solution containing ethylenediaminetetraacetic acid (EDTA) and ammonium hydroxide (NH4OH). The findings suggest that CTAB can be a valuable additive in the development of methods for recovering noble metals from waste materials, particularly in complex chemical environments.
Experimental Setup and Conditions: The batch adsorption experiments were conducted under specific conditions: a pH of 2, an adsorbent dosage of 1.6 g/L, a contact time of 780 minutes, and a temperature of 25°C. Palladium concentrations ranged from 50 to 500 mg/L. The synthetic ELP solutions used in the experiments were prepared by dissolving Pd(II) in deionized water, along with EDTA and NH4OH, and an optional CTAB surfactant.
The adsorption studies revealed that the presence of CTAB in the solution moderately enhanced the Pd removal efficiency of the Amberlyst A21 resin. The maximum Pd adsorption was observed to be 104.17 mg/g at a CTAB concentration of 2 CMC (critical micelle concentration). Continuous mixing during the experiments ensured mass transfer equilibrium, and Pd(II) concentrations in the filtrate were measured using atomic absorption spectroscopy.
The Langmuir model, which suggests monolayer adsorption on a homogeneous surface, and the Freundlich model, which implies heterogeneous adsorption mechanisms, both fit well with the experimental data. This indicates that the adsorption of Pd onto Amberlyst A21 resin in the presence of CTAB involves both homogeneous and heterogeneous processes.
Conclusion: The study concludes that while other components in the solution (such as EDTA and NH4OH) have a significant inhibitory effect on Pd adsorption, the addition of CTAB surfactant marginally improves the adsorption efficiency of Amberlyst A21 resin.

Cetrimonium Bromide for the Preparation of Antimony and Tin-antimony Alloy Nanorods via Microwave Hydrothermal Method

Jena S, et al. Applied Surface Science, 2021, 542, 148756.

Cetrimide bromide (CTAB) can be used to prepare antimony and tin-antimony alloy nanorods (Sb-SnSb NRs) from nanoparticle precursors (Sb-SnSb NPs) via microwave-hydrothermal method. The synergistic effect of CTAB and microwave-hydrothermal environment forces the nanoparticles to self-assemble and fuse into stacked nanorods.
The specific method is as follows:
Step I: Synthesis of Sb-SnSb Nanoparticles
Initially, 150 mmol of sodium citrate was dissolved in 180 ml of deionized water. To this solution, 50 mmol of SbCl3 and 25 mmol of SnCl2·2H2O were added and stirred until fully dissolved. The solution was then cooled to 5 °C using an ice bath containing NaCl. Once the desired temperature was reached, a separately prepared solution containing 40 mmol of NaOH and 37.5 mmol of NaBH4 in deionized water was rapidly injected into the precursor solution. This injection caused vigorous effervescence, and the solution color changed to black, indicating the formation of the nanoparticles. The reaction mixture was then allowed to warm to room temperature and stirred for 1 hour. The resulting crystalline alloy powder was collected by centrifugation, thoroughly washed with deionized water to remove any unreacted residues, and finally rinsed with acetone before being dried in a vacuum oven.
Step II: Synthesis of Sb-SnSb Nanorods
First, 42.86 mg of CTAB, corresponding to its critical micelle concentration at room temperature, was dissolved in 120 ml of deionized water. The nanoparticle mixture (50 mg) was then added to the CTAB solution and ultrasonicated for 1 hour, resulting in a black colloidal solution, indicating uniform dispersion of the nanoparticles. Next, 40 ml of this colloidal solution was transferred into a Teflon-lined autoclave, which was then sealed and placed in a microwave-hydrothermal reactor. The autoclave was exposed to microwave irradiation pulses of 700 W, maintaining an isothermal condition of 120 °C for 90 minutes. After the reaction, the autoclave was cooled to room temperature, and the crystalline powder was retrieved via centrifugation. The powder was then washed sequentially with water and acetone before drying in a vacuum oven.

Cetrimonium Bromide for GNPs-CBCPE Electrode Modification

Hareesha N, et al. Journal of Electroanalytical Chemistry, 2022, 917, 116388.

Cetrimonium bromide was modified on the surface of graphene nanoplatelets (GNPs) and carbon (CB) paste nanocomposites to confer superior electrocatalytic properties for powerful antioxidant rutin (RTN) detection when phosphate buffer (PB) was used as the supporting electrolyte.
The GNPs-carbon paste electrode (CBPE) electrode was prepared as follows:
Unmodified GNPs-CBCPE was made by systematically mixing CB powder (55%), GNPs (15%), and silicone oil (30%) until a homogeneous paste was formed. The obtained composite was placed in a Teflon lumen and its surface was polished using a clean and smooth paper to obtain a homogeneous surface. The final unmodified electrode surface obtained was carefully immersed in distilled water to confiscate contaminants deposited by the substance.
The modified CMB/GNPs-CBCPE was prepared by depositing 10.0 µL of CMB onto the surface of GNPs-CBCPE by drop-coating and leaving it for 5.0 min. The final obtained modified electrode surface was carefully immersed in distilled water to remove the excess CMB and substance-adsorbed contaminants.

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