Preparation, Characterization and Thermal Properties of Polyacrylonitrile/Alpha-Zirconium Phosphate Nanocomposites by Gelation/Crystallization

2010 ◽  
Vol 150-151 ◽  
pp. 951-955
Author(s):  
Dan Dan Yang ◽  
Hai Ping Xu ◽  
Lu Ping Zhu ◽  
Yi Hua Wu
Keyword(s):  
Thermal Stability ◽  
Zirconium Phosphate ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Laser Raman Spectroscopy ◽  
Ammonium Bromide ◽  
Laser Raman ◽  
Transmission Electron ◽  
Cetyl Trimethyl Ammonium ◽  
Thermal Stability Property ◽  
Thermal Stability Of

Nanocomposites of polyacrylonitrile (PAN) and Organophilic alpha-zirconium phosphate (OZrP) were prepared by gelation/crystallization. OZrP was prepared using cetyl trimethyl ammonium bromide (CTAB). The structure of PAN/OZrP nanocomposites was characterized by X-ray diffractometry (XRD) and high resolution transmission electron microscopy (HRTEM). The results showed that an intercalated or exfoliated structure was formed. Thermogravimetric analysis (TGA) was applied to characterize thermal stability property, which indicated that the thermal stability of PAN/OZrP nanocomposites was improved compared with that of pure PAN. HRTEM and Laser Raman spectroscopy were used to analyze the microstructure of the chars of PAN/OZrP nanocomposites.

Origin of blue emission in ThO2 nanorods: exploring it as a host for photoluminescence of Eu3+, Tb3+ and Dy3+

RSC Advances ◽  
2014 ◽  
Vol 4 (93) ◽  
pp. 51244-51255 ◽  
Author(s):  
Santosh K. Gupta ◽  
P. S. Ghosh ◽  
A. Arya ◽  
V. Natarajan
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Reverse Micelle ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Blue Emission ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Cetyl Trimethyl Ammonium

Nanorods of ThO2 were synthesized in a reverse micelle technique using cetyl trimethyl ammonium bromide as a surfactant and characterized by X-ray diffraction and transmission electron microscopy.

scholarly journals Morphology-Controlled Synthesis Of SrTiO3 Nanocube By Capping Agent-Assisted Solvothermal Method

Molekul ◽  
2016 ◽  
Vol 11 (1) ◽  
pp. 25
Author(s):  
Yulia Eka Putri ◽  
Alvionita Alvionita ◽  
Rini Rahma Yanti ◽  
Diana Vanda Wellia
Keyword(s):  
Cetyl Trimethyl Ammonium Bromide ◽  
Molar Ratio ◽  
Head Group ◽  
Ammonium Bromide ◽  
Capping Agent ◽  
X Ray Diffraction ◽  
Xrd Pattern ◽  
X Ray ◽  
Transmission Electron ◽  
Cetyl Trimethyl Ammonium

The synthesis of SrTiO3 nanocubes have been carried out by solvothermal process using cetyl trimethyl ammonium bromide (CTAB) as capping agent to control the particles morphology. The condition of the synthesis was obtained at 160 ºC for 24 hours with molar ratio of SrTiO3 and capping agent was 1 : 1. The X-ray diffraction (XRD) pattern shows that SrTiO3 adopts a perovskite structure with a higher intensity of 110 at 2q:32.33º and the crystallite size calculated from FWHM was found to be 41 nm. Fourier transform infrared (FTIR) spectrum shows a shift in particular absorption band attributed the interaction between SrTiO3 particles surface and the head group of CTAB molecules. Transmission electron microscopy (TEM) image shows the cubic-like particles of SrTiO3, this indicatesthat CTAB successfully functions as capping agent on the synthesis of SrTiO3.

Preparation and Properties of Organo-Montmorillonite Modified R-122 Nanocomposite

2012 ◽  
Vol 602-604 ◽  
pp. 254-258
Author(s):  
Chun Qing Huo ◽  
Hong Juan Gu ◽  
Zai Qian Yu ◽  
Long Zhang
Keyword(s):  
High Performance ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Organic Montmorillonite ◽  
Ft Ir ◽  
Cetyl Trimethyl Ammonium ◽  
The Impact ◽  
Thermal Stability Of

An OMMT (organic montmorillonite) was prepared by ion exchanging between Na-montmorillonite and cetyl trimethyl ammonium bromide (CTAB) and was applied to modify Dicyclopentadiene Dioxide Epoxy(R-122). FT-IR spectra showed that the organic molecules had intercalated into the layers of MMT successfully, X-ray diffraction illustrated that the spacing of layers of MMT increased from 1.43 nm to 3.85 nm. R-122 composite was prepared with this nano-organic montmorillonite. When the content of OMMT was 4.0% (wt%), the impact strenth of the composite reached to the highest(21.2 J/m), which is 92.7% higher than the pure R-122 . Morphology of the fracture checked by SEM, reveals a depth depended distribution which generated more new surface, thus can absorb more impact energy. Differential scanning calorimetry(DSC) showed that the thermal stability of the composite had improved compared with the pure resin. And what’s more, the improvement of toughness doesn’t hurt the resin’s heat resistance, it may provid a new way to prepare high performance R-122 composites.

Microwave Synthesized CuO Nanoleaves as Nonenzymatic Glucose Sensor

2013 ◽  
Vol 543 ◽  
pp. 76-79 ◽  
Author(s):  
C. Karunakaran ◽  
G. Manikandan
Keyword(s):  
Glucose Oxidation ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Glucose Sensor ◽  
Electrochemical Impedance ◽  
Ammonium Bromide ◽  
X Ray ◽  
Nonenzymatic Glucose Sensor ◽  
Electron Microscopies ◽  
Transmission Electron ◽  
Cetyl Trimethyl Ammonium

CuO nanoleaves have been synthesized by cetyl trimethyl ammonium bromide (CTAB)-assisted microwave method and characterized by powder X-ray and selected area electron diffractions, scanning and transmission electron microscopies and energy dispersive X-ray and electrochemical impedance spectroscopies. The CuO nanoleaves on graphite nonenzymatically sense glucose electrochemically. Cyclic voltammetic and chronoamperometric studies reveal the excellent catalytic activity of the modified electrode towards direct glucose oxidation. A wider linear range of glucose concentration and a shorter response time are observed. The detection limit of glucose is as low as 4µM and the CuO nanoleaves can be used as efficient electrochemical sensor.

J- and H-Aggregates of Porphyrins with Surfactants: Fluorescence, Stopped Flow and Electron Microscopy Studies

1998 ◽  
Vol 02 (05) ◽  
pp. 369-376 ◽  
Author(s):  
NAKUL C. MAITI ◽  
SHYAMALAVA MAZUMDAR ◽  
N. PERIASAMY
Keyword(s):  
Electron Microscopy ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Spectroscopic Properties ◽  
Ammonium Bromide ◽  
Fluorescence Depolarization ◽  
Inorganic Cations ◽  
Transmission Electron ◽  
J Aggregates ◽  
Cetyl Trimethyl Ammonium ◽  
Premicellar Aggregates

The interaction of cationic surfactants such as CTAB (cetyl trimethyl ammonium bromide) with tetrakis-(4-sulfonato phenyl) porphine ( H 4 TPPS 2−), a dianion, leads to the formation of two premicellar aggregates of porphyrin when [CTAB] is below CMC (critical micelle concentration) and a micellized monomer when [CTAB] is above CMC. The premicellar aggregates are labeled as J- and H-aggregates because of their characteristic spectroscopic properties. Simple inorganic cations such as K +, Ba 2+, Ca 2+ and Zr 4+ also induce the formation of the J-aggregate but not of the H-aggregate. The formation of the J-aggregate is preceded by kinetic intermediates, while no intermediate was observed prior to the formation of the H-aggregate. The rate of formation of the H-aggregate was faster than that of the J-aggregate. The fluorescence depolarization (anisotropy) properties of the monomer and the H- and J-aggregates were studied and compared. The size and structure of the J-aggregate were examined by transmission electron microscopy (TEM). The structure of the J-aggregate reveals a fiber-like (linear stacking) or domain-like (helical stacking) arrangement of the porphyrin molecules.

scholarly journals Impact of Fe3O4, CuO and Al2O3 on the AC Breakdown Voltage of Palm Oil and Coconut Oil in the Presence of CTAB

Energies ◽  
2019 ◽  
Vol 12 (9) ◽  
pp. 1605 ◽  
Author(s):  
Nur Aqilah Mohamad ◽  
Norhafiz Azis ◽  
Jasronita Jasni ◽  
Mohd Zainal Abidin Ab Kadir ◽  
Robiah Yunus ◽  
...  
Keyword(s):  
Experimental Study ◽  
Electron Microscope ◽  
Breakdown Voltage ◽  
Palm Oil ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Coconut Oil ◽  
Ammonium Bromide ◽  
Al2o3 Nanoparticles ◽  
Transmission Electron ◽  
Cetyl Trimethyl Ammonium

This paper presents an experimental study on the AC breakdown voltages of Refined, Bleached and Deodorized Palm Oil (RBDPO) Olein and Coconut Oil (CO) in the presence of conductive (Iron (II,III) Oxide, Fe3O4), semi-conductive (Copper (II) Oxide, CuO) and insulative (Aluminium Oxide, Al2O3) nanoparticles without and with surfactant. The type of surfactant used in this study was Cetyl Trimethyl Ammonium Bromide (CTAB). The volume concentrations range of Fe3O4, CuO and Al2O3 was varied from 0.001% to 0.05%. Transmission Electron Microscope (TEM) was used to characterize the nanoparticles in RBDPO and CO. AC breakdown voltage tests were carried out for RBDPO and CO of which the AC breakdown voltage at 1% probability was determined based on Weibull distribution. It is found that only Al2O3 can improve the average AC breakdown voltage of RBDPO and CO. The AC breakdown voltages at 1% probability for RBDPO and CO can be improved through introduction of Fe3O4, CuO and Al2O3 at certain volume concentrations. Al2O3 provides the highest enhancement of AC breakdown voltages at 1% probability for RBDPO and CO with the highest percentage of improvement can be up to 52%. CTAB has no clear effect on the improvement of AC breakdown voltages of RBDPO and CO based Fe3O4, CuO and Al2O3 nanofluids.

Improvement of Thermal Stability of Cassava Starch Films from the Incorparation of Bentonite Clay

2019 ◽  
Vol 958 ◽  
pp. 69-73 ◽  
Author(s):  
Mayra Keroly Sales Monteiro ◽  
Victor Rafael Leal Oliveira ◽  
Francisco Klebson Gomes Santos ◽  
Eduardo Lins Barros Neto ◽  
Ricardo Henrique de Lima Leite ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Bentonite Clay ◽  
Cassava Starch ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Modified Clay ◽  
Decomposition Point ◽  
Starch Films ◽  
Cetyl Trimethyl Ammonium ◽  
Thermal Stability Of

This study considered the effect of modified and unmodified bentonite clay on the thermal properties of films based on cassava starch. The bentonite clay was modified in the presence of cetyl trimethyl ammonium bromide (CTAB). The attainment of exfoliated or intercalated nanocomposite was characterized by X-ray diffraction (XRD) and Fourier transform by infrared radiation (FTIR). In XRD, it was verified that the cassava starch dispersed the modified clay in an exfoliated way and unmodified clay in an intercalated way. In the FTIR it was characterized that the cassava starch interacted more with the modified bentonite clay compared to unmodified. Finally, thermogravimetric curves showed the thermal property of the starch films concluding that the modified clay was the reinforcing material that contributed the most to the thermal stability of the cassava starch film, retarding its decomposition point, around 35oC , in relation to the pure starch film.

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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