Preparation of Ag–Polyacrylamide Nanocomposites by Ultraviolet Irradiation Technique

2010 ◽  
Vol 44-47 ◽  
pp. 2199-2202 ◽  
Author(s):  
Wei Pan ◽  
Yan Chen
Keyword(s):  
Ultraviolet Irradiation ◽  
Hybrid Composites ◽  
Polymer Chains ◽  
Hybrid Nanocomposites ◽  
Stability Behavior ◽  
Transmission Electron ◽  
Ag Particles ◽  
Pure Phase ◽  
Ft Ir ◽  
Nanoparticle Composites

Polyacrylamide (PAM)/silver (Ag) nanoparticle composites were prepared via ultraviolet irradiation of a mixture solution of silver nitrate (AgNO3) and PAM. The resultant composites were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) thermogravimetric (TG) and Fourier transform infrared (FT-IR). XRD results showed that pure phase Ag was obtained in the prepared nanocomposites. TEM results showed that the Ag particles were in sphere shape with 8-25nm diameter in the as-prepared nanocomposites. FTIR characterized the interaction between polymer chains and Ag particles in hybrid nanocomposites. The TGA results showed improved thermoresistance and high thermal stability behavior of hybrid composites.

Structure and Properties of Ag–Polyacrylamide Nanocomposites by Heat Treatment

2010 ◽  
Vol 44-47 ◽  
pp. 2373-2376
Author(s):  
Hui Qin Zhang ◽  
Li Yan Zhang
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Structure And Properties ◽  
Ag Nanoparticle ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Transmission Electron ◽  
Ag Particles ◽  
Pure Phase ◽  
Nanoparticle Composites

Polyacrylamide (PAM)/silver (Ag) nanoparticle composites were prepared via heat treatment of a mixture solution of silver nitrate (AgNO3) and PAM. The resultant composites were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). XRD results showed that pure phase Ag was obtained in the prepared nanocomposites. TEM results showed that the Ag particles were in sphere shape with 8-25nm diameter in the as-prepared nanocomposites. DSC results showed that the glass transition temperature of the nanocomposites was enhanced by the incorporation of Ag.

Characterization and Morphology of Composites Prepared from Polyacrylonitrile and Silver Nitrate

2010 ◽  
Vol 26-28 ◽  
pp. 159-162 ◽  
Author(s):  
Yan Chen ◽  
Hong Yan Liu ◽  
Zhao Jun Zhang
Keyword(s):  
Electron Microscopy ◽  
Heat Treatment ◽  
Silver Nitrate ◽  
Ag Nanoparticle ◽  
Thermo Gravimetric ◽  
X Ray ◽  
Transmission Electron ◽  
Ag Particles ◽  
Pure Phase ◽  
Nanoparticle Composites

Polyacrylonitrile (PAN)/silver (Ag) nanoparticle composites were prepared via heat treatment of composite solutions of silver nitrate (AgNO3) and PAN in N, N-dimethylformamide (DMF). The resultant composites were characterized by infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and Thermo gravimetric analyses (TGA). TGA results showed that the PAN/Ag composite are thermally more stable than the corresponding neat PAN. XRD results showed that pure phase Ag was obtained in the prepared nanocomposites. They also showed that crystallinity of PAN was largely decreased after the composition with nano-sized Ag. TEM results showed that the Ag particles were in sphere shape with 30-60nm diameter in the as-prepared nanocomposites.

Hybrid Nanocomposites Based on Metal Oxides and Polysiloxanes with Controlled Morphology

2007 ◽  
Vol 1007 ◽  
Author(s):  
Sorin Ivanovici ◽  
Christoph Rill ◽  
Claudia Feldgitscher ◽  
Guido Kickelbick
Keyword(s):  
Metal Oxides ◽  
Sol Gel ◽  
Hybrid Nanocomposites ◽  
Hybrid Nanoparticles ◽  
Spectroscopic Methods ◽  
Metal Alkoxides ◽  
Transmission Electron ◽  
Sol Gel Process ◽  
Ft Ir ◽  
Controlled Morphology

ABSTRACTHybrid materials based on polysiloxanes and metal oxides (SiO2, TiO2, ZrO2) were prepared by hydrosilation of allyl acetoacetate (AAA) modified metal alkoxides (M(OR)4; M = Ti, Zr; R = ethyl, isopropyl) or vinyl triethoxysilane with poly(dimethylsiloxane-co-hydrosiloxane) (PDMS-co-PMHS). The obtained compounds acted as single-source precursors in the sol-gel process. Various spectroscopic methods showed the complete functionalization of the polysiloxane chains with the complexes. When alcohols were used as solvents in the sol-gel process, hybrid nanoparticles were obtained, as observed by dynamic light scattering (DLS) measurements, transmission electron microscopy (TEM), and spectroscopic methods such as NMR and FT-IR.

Characterization of Poly (Vinyl Alcohol) /Silver Nanocomposites Prepared by Heat Treatment Method

2010 ◽  
Vol 26-28 ◽  
pp. 127-130 ◽  
Author(s):  
Wei Pan ◽  
Hui Li ◽  
Yan Chen
Keyword(s):  
Heat Treatment ◽  
Vinyl Alcohol ◽  
Treatment Method ◽  
Poly Vinyl Alcohol ◽  
Scanning Calorimetry ◽  
Transmission Electron ◽  
Ag Particles ◽  
Nanoparticle Composites ◽  
Heat Treatment Method

Poly (vinyl alcohol) (PVA)/silver (Ag) nanoparticle composites were prepared via heat treatment of a mixture solution of silver nitrate (AgNO3) and PVA. The resultant composites were characterized by infrared spectroscopy (FTIR), X-ray powder diffraction (XRD), transmission electron microscopy (TEM) and differential scanning calorimetry (DSC). XRD results showed that pure phase Ag was obtained in the prepared nanocomposites. They also showed that crystallinity of PVA was largely decreased after the composition with nano-sized Ag. TEM results showed that the Ag particles were in sphere shape with 10-40nm diameter in the as-prepared nanocomposites. DSC results showed that the glass transition temperature of the nanocomposites was enhanced by the incorporation of Ag.

scholarly journals Structurally Designed Imine Skeletal Pyrenyl Pendant Pyridine Core Polybenzoxazine nSiO2/PBZ Hybrid Polymer Nanocomposites

2021 ◽  
Vol 33 (4) ◽  
pp. 793-801
Author(s):  
S.G. Gunasekaran ◽  
L. Devaraj Stephen ◽  
V. Arivalagan ◽  
M. Soundarrajan
Keyword(s):  
Electron Microscope ◽  
Sol Gel ◽  
Hybrid Nanocomposites ◽  
Spectral Studies ◽  
Fluorescent Properties ◽  
Excellent Thermal Stability ◽  
Transmission Electron ◽  
Ft Ir ◽  
Hydrophobic Nature ◽  
Nanosilica Particles

Novel polybenzoxazine-silica (nSiO2/PBZ) hybrid nanocomposites were designed and synthesized using carbazole terminal pyrenyl pyridine core imine skeletal benzoxazine monomer (PYCBZ) and nanosilica (nSiO2) through in situ sol-gel method. The FT-IR and Raman spectral studies ascertained the formation of nanosilica reinforced polybenzoxazine hybrid nanocomposites. The nSiO2/PBZ hybrid nanocomposites exhibited excellent thermal stability and higher char yield than that of neat PBZ. The elevation in glass transition temperature of the nanocomposites was evidenced by the limited motion of the polymeric network with the introduction of nanosilica particles in the PBZ matrices. The hydrophobic nature of a less polar nSiO2 in the composites zipped the water uptake behaviour of (nSiO2/PBZ) hybrid nanocomposites to low percentage. The shift in the absorption peak reveals that the nanosilica particles were successfully incorporated through thermal ring opening polymerization of benzoxazine. The homogeneous reinforcement of nSiO2 particles retains the fluorescent properties of polybenzoxazine. The uniform molecular level dispersion of nano SiO2 onto polybenzoxazine networks were confirmed from transmission electron microscope and scanning electron microscope images.

scholarly journals Microstructure and properties of PET/EPDM, EPDM-g- MA/organoclay ternary hybrid nanocomposites: effect of blending sequence

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Morad Ali Khatibi ◽  
Ahmad Arefazar ◽  
Masoud Esfandeh
Keyword(s):  
Hybrid Composites ◽  
Hybrid Nanocomposites ◽  
Melt Blending ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Single Process ◽  
Blending Sequence ◽  
Poly Ethylene ◽  
Diene Rubber ◽  
Mixing Sequence

AbstractPoly(ethylene terphthalate) (PET)/organomontmorilonite (OMMT)/maleic anhydride ethylene-propylene-diene rubber (EPDM-g-MA) nanocomposites were prepared via melt blending of the ingredients in a Haake Rheocord mixer. To make the hybrid composites, four different blending routes were examined: 1) preparing EPDM/EPDM-g-MA (EPMA)/organoclay nanocomposite and then blending it with PET, (S1), 2) dispersion of organoclay in PET and then blending it with EPMA, (S2), 3) blending PET with EPMA and then mixing it with organoclay, (S3), 4) blending PET, EPMA and organoclay in a single process, (S4). The microstructure of the PET/(EPMA)/organoclay ternary hybrids were characterized by X-ray diffraction (XRD) and Transmission Electron Microscopy (TEM). The result showed that the blending sequence greatly affects the dispersion of organoclay in the polymer matrix as well as the microstructure of the blends. Mechanical behavior of the blends including tensile and impact properties were also studied. Results revealed that PET/ (EPMA)/organoclay nanocomposites made by mixing sequence, S1, has the maximum tensile and impact strength among the others. This was attributed to its fine “Sea-Island” morphology and good dispersion of the organoclay in the continuous PET matrix.

Bioinspired Heteromultivalent Chitosan-α-Fe2O3/Gadofullerene Hybrid Composite for Enhanced Antibiotic-Resistant Bacterial Pneumonia

2021 ◽  
Vol 17 (6) ◽  
pp. 1217-1228
Author(s):  
Jing Huang ◽  
Jiquan Guo ◽  
Xiaoling Zou ◽  
Jiaxin Zhu ◽  
Shaozhu Wu ◽  
...  
Keyword(s):  
Hybrid Composite ◽  
Therapeutic Potential ◽  
Hybrid Composites ◽  
Absorption Peak ◽  
Hybrid Nanocomposites ◽  
Precipitation Method ◽  
Antibiotic Resistant ◽  
Ft Ir

Herein, we have designed and developed a heteromultivalent chitosan base α-Fe2O3/Gadofullerene (GdF) hybrid composite through a simple chemical precipitation method. Unlike other methods, the addition of external stabilizing agents to generate GdF nanoparticles (NPs) was not necessary herein. The prepared chitosan-α-Fe2O3/GdF hybrid nanocomposites were characterized using UV, FT-IR, XRD and morphological microscopic analyses. The results showed that α-Fe2O3 and GdF hybrid nanocomposites were successfully grown on the surface of chitosan. The FT-IR vibration peaks showed the formation of Fe2O3 NPs, and the vibration peak for Fe–O was 568 cm−1. The broad absorption peak observed in the range of 250–350 nm and a sharp absorption peak at 219 nm represents the UV absorption of the synthesized hybrid composites. XRD pattern showed sharp peaks of crystallinity and purity of α-Fe2O3 nanoparticles. Finally, the synthesized chitosan-α-Fe2O3/GdF hybrid composites were screened for their antibacterial resistance against the Escherichia coli, Pseudomonas aeruginosa, Bacilus subtilis, and Staphylococcus aereus. In addition, in vitro biocompatibility results exhibited that developed hybrid samples have provided high cell compatibility with fibroblast (L929) cell line. The in vivo bio inspired nanotherapeutics have the potential action to effective inhibition ability on antibiotic-resistant P. aeruginosa, which has been main factor of inducing pneumonia. In conclusion, we expect biomimicking systems combined with the effective antibacterial agent could be the suitable next generation therapeutic potential factors for prevention and treatment of antibiotic-resistant pneumonia.

High-Frequency Absorption of the Hybrid Composites with Spindle-like Fe3O4 Nanoparticles and Multiwalled Carbon Nanotubes

NANO ◽  
2016 ◽  
Vol 11 (09) ◽  
pp. 1650097 ◽  
Author(s):  
Ruozhou Xia ◽  
Yichao Yin ◽  
Min Zeng ◽  
Hangrong Dong ◽  
Haozhe Yang ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
High Frequency ◽  
Hybrid Composites ◽  
Magnetic Loss ◽  
Impedance Matching ◽  
Hybrid Nanocomposites ◽  
Multiwalled Carbon ◽  
Multi Wall Carbon Nanotubes ◽  
Transmission Electron ◽  
Transfer Behavior

The anisotropic spindle-like Fe3O4 hybrid nanocomposites blended with multi-wall carbon nanotubes (MWCNTs) have been prepared to function as an ideal lightweight candidate for electromagnetic (EM) wave absorption with decent performance in high frequency. The microstructure, morphology, magnetic properties, charge-transfer behavior and EM wave absorbing performance have been characterized by powder X-ray diffractometer, transmission electron microscope, vibrating sample magnetometer, Raman spectrometer and vector network analyzer, respectively. A maximum reflection loss reaches around [Formula: see text]40[Formula: see text]dB with 5% MWCNTs loading density. Compared with the monomer Fe3O4, the complex permittivity and permeability of the Fe3O4–MWCNTs nanocomposites are kept in balance, achieving a better impedance matching with a larger dielectric loss and magnetic loss. The optimization may be attributed to the synergistic effect between spindle-like Fe3O4 nanoparticles and MWCNTs. Moreover, the EM microwave absorbing performance can be optimized by tuning the Fe3O4–MWCNTs mass ratio and layer thickness of the samples, indicating promising application prospects for outstanding performance EM attenuation materials in high frequency.

Magnetic and dielectric properties of BiFeO3 nanoparticles

2015 ◽  
Vol 7 (2) ◽  
pp. 1393-1403
Author(s):  
Dr R.P VIJAYALAKSHMI ◽  
N. Manjula ◽  
S. Ramu ◽  
Amaranatha Reddy
Keyword(s):  
Diffuse Reflectance Spectrum ◽  
Precipitation Method ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Bifeo3 Nanoparticles ◽  
Transmission Electron ◽  
Multiferroic Bifeo3 ◽  
Pure Phase ◽  
Simple Chemical ◽  
Co Precipitation

Single crystalline nano-sized multiferroic BiFeO3 (BFO) powders were synthesized through simple chemical co-precipitation method using polyethylene glycol (PEG) as capping agent. We obtained pure phase BiFeO3 powder by controlling pHand calcination temperature. From X-ray diffraction studies the nanoparticles were unambiguously identified to have a rhombohedrally distorted perovskite structure belonging to the space group of R3c. No secondary phases were detected. It indicates single phase structure. EDX spectra indicated the appearance of three elements Bi, Fe, O in 1:1:3. From the UV-Vis diffuse reflectance spectrum, the absorption cut-off wavelength of the BFO sample is around 558nm corresponding to the energy band gap of 2.2 eV. The size (60-70 nm) and morphology of the nanoparticles have been analyzed using transmission electron microscopy (TEM).   Linear M−H behaviour and slight hysteresis at lower magnetic field is observed for BiFeO3 nanoparticles from Vibrating sample magnetometer studies. It indicates weak ferromagnetic behaviour at room temperature. From dielectric studies, the conductivity value is calculated from the relation s = L/RbA Sm-1 and it is around 7.2 x 10-9 S/m.

scholarly journals Pd Nanoparticles Stabilized on the Cross-Linked Melamine-Based SBA-15 as a Catalyst for the Mizoroki–Heck Reaction

2021 ◽  
Author(s):  
Ayat Nuri ◽  
Abolfazl Bezaatpour ◽  
Mandana Amiri ◽  
Nemanja Vucetic ◽  
Jyri-Pekka Mikkola ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Inductively Coupled Plasma ◽  
High Surface ◽  
High Surface Area ◽  
Coupling Reaction ◽  
Pd Nanoparticles ◽  
Significant Activity ◽  
Inductively Coupled ◽  
Transmission Electron ◽  
Ft Ir

AbstractMesoporous SBA-15 silicate with a high surface area was prepared by a hydrothermal method, successively modified by organic melamine ligands and then used for deposition of Pd nanoparticles onto it. The synthesized materials were characterized with infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), nitrogen physisorption, scanning electron microscopy (SEM) coupled with energy dispersive X-ray analysis (EDX), transmission electron microscopy (TEM), nuclear magnetic resonance (NMR) and inductively coupled plasma (ICP-OES). The catalyst was effectively used in the Mizoroki–Heck coupling reaction of various reactants in the presence of an organic base giving the desired products in a short reaction time and with small catalysts loadings. The reaction parameters such as the base type, amounts of catalyst, solvents, and the temperature were optimized. The catalyst was easily recovered and reused at least seven times without significant activity losses. Graphic Abstract

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