Synthesis and Characterization of Gold Nanoplates onto Solid Substrates by Seed-Mediated Growth Method

2013 ◽  
Vol 756 ◽  
pp. 112-118
Author(s):  
Iwantono ◽  
Akrajas Ali Umar ◽  
Erman Taer ◽  
Vepy Asyana
Keyword(s):  
Cetyl Trimethyl Ammonium Bromide ◽  
Edge Length ◽  
Ammonium Bromide ◽  
Vis Spectroscopy ◽  
Solid Substrates ◽  
Growth Method ◽  
Seed Mediated ◽  
Cetyl Trimethyl Ammonium ◽  
Two Peaks

A simple technique of seed-mediated growth has successfully been performed to grow gold nanoplates onto solid substrates. The growth of gold nanoplates have been carried out attemperature of 28-30°C in the presence of a binary surfactant mixture: CTAB (cetyl trimethyl ammonium bromide) and PVP (poly-vinylpyrrolidone) with their various concentrations. Characterizations of the samples have been carried out by using UV-Vis spectroscopy, XRD and FESEM.UV-Vis spectra showed that the gold particles have grown with a various geometrical forms, such as spherical and others. XRD results informed that the presence of two peaks at 2θ: 38.195oand 44.393oindicated the gold nanoplates, with their crystal orientation of (111) and (200). FESEM images showed the edge-length size of nanoplates was dominated in the range of 11nm to 50 nm, with various morphologies of nanoplates, such as hexagonal,truncated hexagonal, triangular, square and spherical shapes.

Synthesis and Characterization of Nano Hydroxyapatite

2011 ◽  
Vol 264-265 ◽  
pp. 1370-1375 ◽  
Author(s):  
S. Sarfraz ◽  
B. Naseem ◽  
S. Amin ◽  
M. Mujahid
Keyword(s):  
Cetyl Trimethyl Ammonium Bromide ◽  
Lattice Structure ◽  
Hexagonal Lattice ◽  
Nano Particles ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cetyl Trimethyl Ammonium ◽  
Chemical Groups

Hydroxyapatite (HA) is considered to form major component of bones and teeth. Synthesis of hydroxyapatite (Calcium phosphate, Ca10(PO4)6(OH)2) was carried out to produce nano powders. The size and shape of nano particles was controlled during synthesis by using templates of Cetyl Trimethyl Ammonium Bromide (CTAB). A cationic surfactant, CTAB creates micellar structures which would act as nano reactors for the synthesis of nano scale HA. Yield of the final product has also been examined by varying the surfactant concentration. X-ray diffraction data revealed characteristic peaks of HA, where a predominantly hexagonal lattice structure could be deduced. FTIR was used to observe the various chemical groups present in the product. Scanning electron microscope was used for the characterization of nano particles.

scholarly journals Modification of Carbon Nanotube for Synthesis of Titania Nanotube (Tint)-Carbon Nanotube (Cnt) Composite

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Desi Heltina
Keyword(s):  
Carbon Nanotube ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Phenol Degradation ◽  
Dispersion Stability ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Titania Nanotube ◽  
Cetyl Trimethyl Ammonium

Carbon nanotube (CNT) is a material widely chosen for object of research in nano technology. Apart from its good absorbent property, CNT also has a unique structure, superior mechanic and electric properties and its high strength. The property of CNT above is to be expected to improve performance of Titania nanotube (TiNT) composite. Properties of pure CNT are hydrophobic at the surface and low dispersion stability. To improve dispersability of CNT then modification need to be modified. Adding Cetyl trimethyl ammonium bromide (CTAB) surfactant on CNT is a way to increase dispersion stability of TiNT-CNT. The objective of the research was to study influence of adding of Cetyl trimethyl ammonium bromide (CTAB) surfactant to synthesis of TiNT-CNT composite in degrading phenol compound. Pure CNT was added with CTAB surfactant in liquid, then was sonificated and dried. Surfactant Cetyl trimethyl ammonium bromide (CTAB) added CNT then composited with TiNT. Phenol degradation then tested by using TiNT-CNT (CTAB) in reactor for 4.5 hours. Then sample was characterized by employing Field Emission Scanning Electron Microscopy (FESEM), X-ray Diffraction (XRD), Fourier Transform Infra-Red (FTIR) and UV-vis Spectroscopy. The result of experiments from FESEM characterization showed forming of TiNT-CNT composites morphology. From X–ray Diffraction (XRD) characterization showed crystal formed on TiNT-CNT only of anatase crystal. Degradation of TiNT-NT composite (CTAB) to phenol was also studied.

Preparation and Characterization of Silica-Based Mesoporous Materials

2011 ◽  
Vol 396-398 ◽  
pp. 463-467
Author(s):  
Xiao Hui Zhang ◽  
Qi Guang Cao ◽  
Guo Li Xie
Keyword(s):  
Hydrochloric Acid ◽  
Pore Size ◽  
Mesoporous Materials ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Mesoporous Structure ◽  
Ammonium Bromide ◽  
Pore Sizes ◽  
Silica Source ◽  
Cetyl Trimethyl Ammonium

The silica-based mesoporous materials were synthesized under normal atmospheric with Cetyl trimethyl ammonium bromide(CTAB) as surfactant, TEOS as silica source and hydrochloric acid as activator. The pore sizes distribution of mesoporous materials were adjusted by organic assistant reagent TMB(1,3,5-three toluol).The materials after and before TMB addition were characterized through XRD and IR. The results showed that the materials have regular hexagonal mesoporous structure. The structure is more regular and pore size is more bigger after TMB added.

Voltammetric Characterization of Liquid/Liquid Interfaces Modified with Cetyl-Trimethyl-Ammonium Bromide (CTAB)

2019 ◽  
Vol 15 (1) ◽  
pp. 285-293
Author(s):  
Belinda Gallegos Covarrubias ◽  
Arturo Estrada-Vargas ◽  
Carlos A. Carreon Gutierrez ◽  
Maximiliano Barcena Soto ◽  
Norberto Casillas
Keyword(s):  
Cetyl Trimethyl Ammonium Bromide ◽  
Ammonium Bromide ◽  
Liquid Interfaces ◽  
Cetyl Trimethyl Ammonium

Characterization and Preparation of Glod Nanorods

2013 ◽  
Vol 669 ◽  
pp. 257-260
Author(s):  
Jun Yue Zhu ◽  
Ling Xiang Jia ◽  
Ting Ting Lin ◽  
Zhen Jiang ◽  
Chao Wan Tang ◽  
...  
Keyword(s):  
Silver Ions ◽  
Ammonium Bromide ◽  
Reaction Conditions ◽  
Au Nanorods ◽  
Vis Spectroscopy ◽  
Growth Method ◽  
System Temperature ◽  
Optimum Reaction ◽  
Cetyl Trimethyl Ammonium ◽  
Secondary Ion

Silver ions (Ag+) used as secondary ion, cetyl trimethyl ammonium bromide (CTAB) used as surfactant and ascorbic acid(AA) used as reducing agent, the gold(Au) nanorods were synthesized by seed-mediated growth method. The resulting substrates have been characterized by UV-vis spectroscopy. The law of Au nanorods growing was researched by controlling concentration of CTAB, Ag+, seed-fluid and AA. The results showed that the optimum reaction conditions are 0.10 M CTAB, 0.1×10-3 M Ag+, 0.0056×10-3 M AA, 0.48×10-6 M seed-fluid and system temperature 30°C.

Seed-mediated synthesis and PEG coating of gold nanoparticles for controlling morphology and sizes

MRS Advances ◽  
2020 ◽  
Vol 5 (63) ◽  
pp. 3353-3360
Author(s):  
Susana Helena Arellano Ramírez ◽  
Perla García Casillas ◽  
Christian Chapa González
Keyword(s):  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Room Temperature ◽  
Colloidal Stability ◽  
Infrared Spectrometry ◽  
Ammonium Bromide ◽  
Chloroauric Acid ◽  
Vis Spectroscopy ◽  
Seed Mediated ◽  
Peg Coating

AbstractA significant area of research is biomedical applications of nanoparticles which involves efforts to control the physicochemical properties through simple and scalable processes. Gold nanoparticles have received considerable attention due to their unique properties that they exhibit based on their morphology. Gold nanospheres (AuNSs) and nanorods (AuNRs) were prepared with a seed-mediated method followed of polyethylene glycol (PEG)-coating. The seeds were prepared with 0.1 M cetyltrimethyl-ammonium bromide (CTAB), 0.005 M chloroauric acid (HAuCl4), and 0.01 M sodium borohydride (NaBH4) solution. Gold nanoparticles with spherical morphology was achieved by growth by aggregation at room temperature, while to achieve the rod morphology 0.1 M silver nitrate (AgNO3) and 0.1 M ascorbic acid solution were added. The gold nanoparticles obtained by the seed-mediated synthesis have spherical or rod shapes, depending on the experimental conditions, and a uniform particle size. Surface functionalization was developed using polyethylene glycol. Morphology, and size distribution of AuNPs were evaluated by Field Emission Scanning Electron Microscopy. The average size of AuNSs, and AuNRs was 7.85nm and 7.96 x 31.47nm respectively. Fourier transform infrared spectrometry was performed to corroborate the presence of PEG in the AuNPs surface. Additionally, suspensions of AuNSs and AuNRs were evaluated by UV-Vis spectroscopy. Gold nanoparticles were stored for several days at room temperature and it was observed that the colloidal stability increased once gold nanoparticles were coated with PEG due to the shield formed in the surface of the NPs and the increase in size which were 9.65±1.90 nm of diameter for AuNSs and for AuNRs were 29.03±5.88 and 8.39±1.02 nm for length and transverse axis, respectively.

scholarly journals Preparation of Porous Hydroxyapatite Using Cetyl Trimethyl Ammonium Bromide as Surfactant for the Removal of Lead Ions from Aquatic Solutions

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1617
Author(s):  
Silviu-Adrian Predoi ◽  
Carmen Steluta Ciobanu ◽  
Mikael Motelica-Heino ◽  
Mariana Carmen Chifiriuc ◽  
Monica Luminita Badea ◽  
...  
Keyword(s):  
Cetyl Trimethyl Ammonium Bromide ◽  
Morphological Changes ◽  
Low Cost ◽  
Lead Ions ◽  
Ammonium Bromide ◽  
Porous Hydroxyapatite ◽  
X Ray ◽  
Composition And Structure ◽  
Cetyl Trimethyl Ammonium ◽  
Co Precipitation

In the present study, a new low-cost bioceramic nanocomposite based on porous hydroxyapatite (HAp) and cetyl trimethyl ammonium bromide (CTAB) as surfactant was successfully obtained by a simple chemical co-precipitation. The composition and structure of the HAp-CTAB were characterized by X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, transmission electron microscopy (TEM), scanning electron microscope (SEM) equipped with an energy dispersive X-ray (EDX) spectrometer, and N2 adsorption/desorption analysis. The capacity of HAp-CTAB nanocomposites to remove the lead ions from aqueous solutions was studied by adsorption batch experiments and proved by Langmuir and Freundlich models. The Pb2+ removal efficiency of HAp-CTAB biocomposite was also confirmed by non-destructive ultrasound studies. The cytotoxicity assays showed that the HAp-CTAB nanocomposites did not induce any significant morphological changes of HeLa cells after 24 h of incubation or other toxic effects. Taken together, our results suggests that the obtained porous HAp-CTAB powder could be used for the decontamination of water polluted with heavy metals, such as Pb2+.

Influence of Different Dispersants on the Dispersion Property of Nano-Aluminium Powders

2011 ◽  
Vol 71-78 ◽  
pp. 122-125 ◽  
Author(s):  
Ling Li Song ◽  
Ren Yuan Zhang ◽  
Ling Bo Mao ◽  
Wen Jie Zhu ◽  
Miao Yan Zheng
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Ultrasonic Vibration ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Sodium Dodecyl ◽  
Dispersion Property ◽  
Ammonium Bromide ◽  
Aluminum Powders ◽  
Ultrasonic Time ◽  
Dodecyl Sulfate ◽  
Cetyl Trimethyl Ammonium

The influences of dispersant type, supersonic time and concentration on the dispersion property of the nano-aluminium powders in glycol water were systematically studied by using Sodium dodecyl sulfate (SDS)，cetyl trimethyl ammonium bromide (CTAB) and sodium hexa metah posphate（SHMP）as dispersants. During the first stage of the experiments, influences of dispersant type and ultrasonic time with these dispersants were evaluated. The next stage of the study was focused on SHMP concentration. The influence of SHMP concentration was assessed. The results show that with the increasing of ultrasonic time, the dispersion property of nano-aluminum powders first increases and then decreases, and SHMP is the best one. The excellent dispersing condition on the dispersion property of nano-aluminium is: 5g/L SHMP and 50 min ultrasonic vibration.

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