Preparation of OMMT and Light-Colored and Transparent PI/OMMT Hybrid Composite Films

2013 ◽  
Vol 634-638 ◽  
pp. 1985-1989
Author(s):  
Yun Hua Lu ◽  
Zhi Zhi Hu ◽  
Guo Yong Xiao ◽  
Yan Dong ◽  
Hai Jun Chi
Keyword(s):  
Hybrid Composite ◽  
Hybrid Composites ◽  
Composite Films ◽  
Amic Acid ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Aromatic Diamines ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Ft Ir ◽  
Cetyltrimethyl Ammonium

The organo-modified montmorillonite (OMMT) was prepared from Na+montmorillonite (Na+MMT) by cation exchange with cetyltrimethyl ammonium bromide (CTMAB). The light-colored and transparent polyimide (PI) and OMMT hybrid composite films from the solution of poly(amic acid)(PAA) and various amounts (0.25, 0.50, 0.75, 1.00wt%) of OMMT in N, N-dimethylacetamide (DMAc) were prepared. The PAA was synthesized from the reaction of the alicyclic dianhydrides 1,2,3,4-cyclobutanetrtracarboxylic dianhydride (CBDA) and fluorinated aromatic diamines 1,4-bis(4-amino-2-trifluoromethylphenoxy)benzene (6FAPB). The OMMT and PI/OMMT hybrid composite films were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), UV-vis transmission spectra and solubility testing. The experimental results showed that the OMMT exhibited a 2.12nm d-spacing value. These obtained PI/OMMT hybrid composites were soluble in typical imide type polar solvent. As the OMMT contents are increased, the transparency of the PI/OMMT hybrid composite films is sacrificed slightly. These PI/OMMT hybrid films are good candidates for potential solar cell flexible substrates.

A Facile One-Step Hydrothermal Synthesis of Graphene/CeO2 Nanocomposite and its Catalytic Properties

2013 ◽  
Vol 747 ◽  
pp. 242-245 ◽  
Author(s):  
Manish Srivastava ◽  
Ashok Kumar Das ◽  
Partha Khanra ◽  
Nam Hoon Kim ◽  
Joong Hee Lee
Keyword(s):  
Catalytic Activity ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Xrd Pattern ◽  
Transmission Electron ◽  
One Step ◽  
Ft Ir ◽  
Cetyltrimethyl Ammonium

Graphene/CeO2 nanocomposite has been successfully prepared by directly growing CeO2 nanoparticles on graphene sheets via in-situ reduction of graphene oxide containing the metal precursor. The presence of cetyltrimethyl ammonium bromide (CTAB) results the formation of CeO2 nanoparticles with a narrow size distribution. The structural, morphological, particles size and optical properties of the synthesized products were investigated through X-ray diffraction (XRD), transmission electron microscopy (TEM), fourier transform infrared spectroscopy (FT-IR) and UVvis absorbance spectroscopy, respectively. The XRD pattern shows that graphene/CeO2 nanocomposite is highly crystalline in nature. Growth of CeO2 nanoparticles with size in range of 5-18 nm on the graphene sheet were observed by TEM measurement. Optical energy band gap was calculated to be ~3.30 eV corresponding to direct transition. The catalytic activity of the synthesized nanocomposite was investigated taking hydrazine hydrate as a model system. Significant enhancement in the peak current with respect to CeO2 was observed on graphene/CeO2 nanocomposite-based electrode demonstrating the higher catalytic activity of graphene/CeO2 nanocomposite-based electrode.

Synthesis of Copper Nanohexagons and Microflowers via a Surfactant-Assisted Hydrothermal Process

2013 ◽  
Vol 785-786 ◽  
pp. 420-423
Author(s):  
Jun Jie Jing ◽  
Ji Min Xie ◽  
Gao Yuan Chen ◽  
Wen Hua Li ◽  
Ming Mei Zhang
Keyword(s):  
Hydrothermal Process ◽  
Sodium Ascorbate ◽  
Ammonium Bromide ◽  
Cu Nanoparticles ◽  
X Ray Diffraction ◽  
Cetyltrimethyl Ammonium Bromide ◽  
X Ray ◽  
Cetyltrimethyl Ammonium ◽  
Cu Nanostructures ◽  
Surfactant Assisted

A facile solution-phase process has been demonstrated for the selective preparation of single-crystalline Cu hexagons and flowers by reducing Cuprous iodide (CuI) with Sodium ascorbate (VCNa) in the presence of cetyltrimethyl ammonium chloride (CTAC) or cetyltrimethyl ammonium bromide (CTAB). The product was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). To study the formation process of Cu nanoparticles, samples obtained at various stages of the growth process were studied by XRD. UV-vis spectra of the Cu hexagons and flowers were recorded to investigate their optical properties, which indicated that as-prepared Cu nanostructures exhibited morphology-dependant optical property.

Study on Preparation and Interlayer Ion State of Fe/Ni Pillared Motmorillonite

2013 ◽  
Vol 873 ◽  
pp. 267-272
Author(s):  
Xi Xi Zhu ◽  
Li Wang ◽  
Wei Jia Gao
Keyword(s):  
Structural Changes ◽  
Interlayer Space ◽  
Fluorescence Analysis ◽  
Raw Material ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Cetyltrimethyl Ammonium Bromide ◽  
X Ray ◽  
Pillared Montmorillonite ◽  
Cetyltrimethyl Ammonium

Fe/Ni pillared montmorillonite is synthesized by precursor method. Organic pillared montmorillonite is prepared first by ion exchange with Cetyltrimethyl ammonium bromide (CTAB) using Ca-montmorillonite as raw material after pretreatment. Fe/Ni pillaring agents is prepared by copolymerization method. Then the Fe/Ni pillared montmorillonite is synthesized through ion exchanging and calcining. The structural changes and thermostability were studied through X-ray diffraction, X-ray fluorescence analysis, infrared spectroscopy and TG. analysis. The concentration of CTAB has a significant effect on interlayer space height of momtmorillonite, which can reach 3.9756nm when the concentration is 3CEC. The interlayer space height of Fe/Ni pillared montmorillonite can reach 2.4001nm when when n (Fe3+):n (Ni2+) is equal to 7:3, and it remains 1.7876nm after calcined at 400°C for 2h. This indicates that thermostability is good. Pillaring agents embedded into montmorillonite interlayer, and bonding reaction happened between the skeleton of montmorillonite ([Si4O10]n) and pillaring agents, which forms the bonding of Si-M (Fe or Ni).

Surfactant Assisted Hydrothermal Synthesis of Nano-Microsphere Titania

2014 ◽  
Vol 722 ◽  
pp. 38-41 ◽  
Author(s):  
Yun Fei Zhuang ◽  
Ya Lan Bian ◽  
Lin Jing Zhang
Keyword(s):  
Sodium Dodecyl ◽  
Rutile Phase ◽  
Ammonium Bromide ◽  
Titanium Oxides ◽  
X Ray Diffraction ◽  
Cetyltrimethyl Ammonium Bromide ◽  
X Ray ◽  
Titanium Trichloride ◽  
Cetyltrimethyl Ammonium ◽  
Surfactant Assisted

Using titanium trichloride (TiCl3) as the precursor, cetyltrimethyl ammonium bromide (CTAB), polyvinyl pyrrolidone (PVP), sodium dodecyl sulfate (SDS) as the surfactants, sodium chloride (NaCl) as the mineralizer, titanium oxides (TiO2) nanomicrospheres were synthesized at 170 °C for 24 h via hydrothermal method. Use x-ray diffraction (XRD) and scanning electron microscopy (SEM) to characterize the crystal structure and morphology of the microspheres. The results show that pure rutile phase TiO2 microspheres can be prepared with the assist of surfactant by hydrothermal treatment. The spheres were composed of radial aligned nanorods. The diameters of the rods were about 40 nm and the lengths were about 500 nm. The diameters of the TiO2 microspheres prepared using CTAB, PVP, SDS as the surfactant were among 1μm~2μm, 5μm~10μm, and 2μm~5μm, respectively.

Diethyl Phthalate Removal from Water by CTMAB-Bentonite

2014 ◽  
Vol 997 ◽  
pp. 728-731
Author(s):  
Jing Tang ◽  
Kai Min Fan ◽  
Xiao Mei Huang ◽  
Kun Wang ◽  
Dan Liu
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Diethyl Phthalate ◽  
Ammonium Bromide ◽  
Optimum Conditions ◽  
X Ray Diffraction ◽  
Cetyltrimethyl Ammonium Bromide ◽  
X Ray ◽  
Cetyltrimethyl Ammonium

For CTMAB-bentonite, bentonite and cetyltrimethyl ammonium bromide (CTMAB) were used as starting materials. The adsorbent was characterized by X-ray diffraction (XRD) and Fourier transform infrared (FTIR). According to the results of XRD and FTIR, it can be concluded that CTMAB has intercalated into bentonite inter-layer. Also, the adsorption of DEP onto CTMAB-bentonite has been investigated in the present work. The results of the adsorption experiments show that more than 82% DEP can be removed at the optimum conditions, which indicate that CTMAB-bentonite is an excellent adsorbent for the removal of DEP.

scholarly journals Preparation of Ta2O5 nanoparticles by using cathode glow discharge electrolysis

2021 ◽  
Author(s):  
Quan-fang Lu ◽  
Juan-long Li ◽  
Jie Yu ◽  
Li-juan Cui ◽  
Bo Wang ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Wide Band ◽  
Discharge Voltage ◽  
Tantalum Foil ◽  
Ammonium Bromide ◽  
Wide Band Gap ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Ft Ir ◽  
Glow Discharge Electrolysis ◽  
Cetyltrimethyl Ammonium

Abstract Tantalum pentoxide nanoparticles (Ta2O5 NPs) were fabricated by cathode glow discharge electrolysis (CGDE) generated between a needle-like platinum wire cathode and a tantalum foil anode in 6 g L−1 Na2SO4 electrolyte solution containing 5 mL hydrofluoric acid (HF) and 0.075 g cetyltrimethyl ammonium bromide (CTAB). The chemical structure, composition and morphology of the obtained powder were analyzed by using XRD, FT-IR, SEM/EDS, XPS and UV-vis DRS. The results found that Ta2O5 NPs with orthorhombic structure and wide band gap (3.6 eV) are successfully fabricated at 500 V discharge voltage in about 3 h. CTAB as a stabilizing agent can reduce the agglomeration due to forming CTA+ and attaching the surface of the synthetic products. A possible preparation mechanism of Ta2O5 NPs is proposed. Firstly, the tantalum foil anode is oxidized to form a compact Ta2O5 layer. Then, Ta2O5 surface is etched to form soluble [TaF7]2− complexes in the presence of HF. After that, soluble [TaF7]2− complexes can react with H2O to form Ta(OH)5. Finally, Ta(OH)5 is further converted to Ta2O5 from plasma-liquid interface into solution.

Synthesis of Nano-Microsphere Titania with CTAB Assisted by Hydrothermal Method

2014 ◽  
Vol 722 ◽  
pp. 42-45
Author(s):  
Yun Fei Zhuang ◽  
Ya Lan Bian
Keyword(s):  
Hydrothermal Method ◽  
Ammonium Bromide ◽  
Titanium Oxides ◽  
X Ray Diffraction ◽  
Cetyltrimethyl Ammonium Bromide ◽  
X Ray ◽  
Structure And Morphology ◽  
Titanium Trichloride ◽  
Cetyltrimethyl Ammonium ◽  
Scanning Electron

Using titanium trichloride (TiCl3) as the precursor, sodium chloride (NaCl) as the mineralizer, cetyltrimethyl ammonium bromide (CTAB) as surfactant, titanium oxides (TiO2) nanomicrospheres were synthesized by hydrothermal method. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were employed to characterize the crystal structure and morphology of the microspheres. The results indicate that the spheres were rutile with diameters of about 1μm ~5μm. The spheres were composed of radially aligned nanorods with diameters of about 40nm and lengths of 500nm. The influences of the concentration of surfactant and the concentration of mineralizer were also researched. The microsphere diameter and grain size both reduce with the increase of the concentration of CTAB. The microspheres get larger and more complete with the higher mineralizer concentration.

Comparative Study of Organophilic Clays to be Used in the Gas & Petrol Industry

2010 ◽  
Vol 660-661 ◽  
pp. 1037-1042 ◽  
Author(s):  
Simone C.Gallani Rodrigues ◽  
M.B. Queiroz ◽  
Kleberson R. O. Pereira ◽  
Meiry Glaúcia Freire Rodrigues ◽  
Francisco Rolando Valenzuela-Díaz
Keyword(s):  
Infrared Spectroscopy ◽  
Quaternary Ammonium ◽  
Lubricating Oil ◽  
Basal Spacing ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Ion Exchange Reaction ◽  
Organophilic Clays ◽  
Cetyltrimethyl Ammonium

Brasgel clay and Gray clay has been been subjected to modification through ion-exchange reaction by quaternary ammonium (cetyltrimethyl ammonium bromide, CTAB). The samples were studied by X-Ray Diffraction, Infrared Spectroscopy, Scanning Electron Microscopy (SEM) and the Foster’s Swelling test. The results indicated that the quaternary ammonium salts were intercalated between the layers of clay. The basal spacing of unmodified Brasgel clay, determined by XRD, was 1.329 nm and after modification it increased up to 2.101 nm. By analyzing the results obtained in this study, particularly those provided by infrared spectroscopy, it was concluded that the treated, organophilic sample (modified with CTAB) comprised CH2 and CH3 groups in its structure, which provides evidence of the efficiency of the organophilization process. Foster´s swelling was carried out with and without agitation in gasoline, diesel, toluene and lubricating oil. The results indicated the samples was organophilic materials, with improved efficiency of Brasgel clay in gasoline and diesel and when compared to Gray clay in the test of capacity for adsorption and Foster´s swelling, the results were similar to kerosene and lubricating oil.

V2O5-Polyaniline Nanocomposite as a Catalyst for Heterogeneous Ozonolysis of Oleic Acid

2011 ◽  
Vol 364 ◽  
pp. 217-221 ◽  
Author(s):  
Khadijeh Beigom Ghoreishi ◽  
Asim Nilofar ◽  
Mohd Ambar Yarmo
Keyword(s):  
Oleic Acid ◽  
Ammonium Bromide ◽  
Ozone Absorption ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Weight Percentage ◽  
Acid Cleavage ◽  
Micelle Solution ◽  
Ft Ir ◽  
Cetyltrimethyl Ammonium ◽  
Sulfate Hydrate

Nanocomposite V2O5-polyaniline (pani) is produced via micelle solution by using cationic surfactant (cetyltrimethyl ammonium bromide, CTAB) and vanadyl sulfate hydrate as a precursor. TEM results showed that V2O5-pani nanocomposite with 20-70 nm in size is formed via micelle solution. This nanocomposite as catalyst is utilized the production of azelaic acid (AA) and pelargonic acid (PA) from oleic acid cleavage in solvent free medium. Various loading percentages of V2O5in Pani are considered and their differences in activity and selectivity are also evaluated. According to GC analysis, results showed that nanocomposite as catalyst is two times more selective to AA compare to bulk V2O5(53%, 28% respectively). Also this nanocomposite indicated higher selectivity to AA and PA rather than nanoV2O5(53% compare to 32%) It is showed that in higher weight percentage of V2O5to polyaniline, the conversion of OA to two main products, AA and PA in ozonolysis reaction ( according to Criegee mechanism ) is higher. Ozone absorption of OA is monitored by FT-IR and the activity and selectivity of catalyst is monitored by GC-FID.

Preparation and Photocatalytic Activity of Fe3+-TiO2-CTAB Nanostructured Films

2014 ◽  
Vol 924 ◽  
pp. 41-45 ◽  
Author(s):  
Chun Xiao Yue ◽  
Jun Shen ◽  
Peng Ding ◽  
Lan Fang Yao
Keyword(s):  
Photocatalytic Activity ◽  
Self Assembly ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Cetyltrimethyl Ammonium Bromide ◽  
Nanostructured Films ◽  
X Ray ◽  
Assembly Technique ◽  
Cetyltrimethyl Ammonium ◽  
Xrd Patterns

Fe3+-TiO2-CTAB nanostructured films were prepared by self-assembly technique, using surfactant cetyltrimethyl ammonium bromide (CTAB). The properties of the samples were examined by thermogravimetric analysis (TGA), X-ray diffraction (XRD) and UV-Vis spectrophotometry, respectively. The crystalline phase of the sample calcined at 450°C is mostly anatase-TiO2 (A) accompanied by a small amount of rutile-TiO2 (R). No significant characteristic peaks of iron oxide were detected in the XRD patterns, it suggested that Fe3+ ions incorporated into the TiO2 skeleton and composed the mesoporous structures with TiO2 uniformly. Fe3+-TiO2-CTAB nanofilms exhibited higher photocatalytic activity under the effect Fe3+ of and CTAB.

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