Microwave-assisted synthesis of channel-containing polymeric materials

e-Polymers ◽  
2005 ◽  
Vol 5 (1) ◽  
Author(s):  
Michael Klink ◽  
Ute Kolb ◽  
Helmut Ritter
Keyword(s):  
Internal Surface ◽  
Polymeric Materials ◽  
Fibre Surface ◽  
Surface Structures ◽  
Microwave Assisted Synthesis ◽  
Glycol Dimethacrylate ◽  
Microwave Assisted ◽  
Monomer Solution ◽  
Mw Irradiation ◽  
Scanning Electron

AbstractIron shows fast heat development under microwave (MW) irradiation. This property was used to start polymerization reactions on the surface of iron fibres. MW irradiation of metal fibres, which are located in a monomer solution consisting of methyl methacrylate, ethylene glycol dimethacrylate, N,N’-azoisobutyronitrile and toluene led to the formation of polymer on the metal fibre surface. After dissolving the covered iron component in hydrochloric acid, a channelcontaining polymeric material was obtained. Scanning electron microscopy showed a smooth material with rough inner channels. These internal surface structures were caused by the rough surface of the metal fibres.

Microwave-Assisted Synthesis of a New Hydantoin Monomer for Antibacterial Polymeric Materials

2009 ◽  
Vol 62 (3) ◽  
pp. 232 ◽  
Author(s):  
Mauro Iannelli ◽  
Fabio Bergamelli ◽  
Giancarlo Galli
Keyword(s):  
Polymeric Materials ◽  
Ethyl Acrylate ◽  
Attenuated Total Reflection ◽  
Polymeric Films ◽  
Microwave Assisted Synthesis ◽  
Chlorination Reaction ◽  
Microwave Assisted ◽  
Low Surface Energy ◽  
Step Procedure ◽  
Biological Tests

11-(4,4-Dimethyl-2,5-dioxoimidazolidin-1-yl)undecyl acrylate was synthesized in a two-step procedure using microwave irradiation. Poly(acrylates) containing fluorinated and hydantoin (5,5-dimethylimidazolidine-2,4-dione) moieties were prepared by free radical polymerization of 2-(perfluorooctyl)ethyl acrylate and the synthesized monomer with the aim of obtaining low surface energy polymeric materials with properties of contact-active biocides. Polymeric films were treated with a bleaching solution in order to convert the hydantoin units to N-halamines, well-known contact-active biocides. The reversibility of the chlorination reaction, necessary to impart a renewable biocide effect, was investigated by Fourier Transform-Attenuated Total Reflection. Preliminary biological tests conducted against Bacillus megaterium demonstrated the effective biocide properties of the prepared materials.

scholarly journals Microwave Assisted Synthesis of Six Member Ring Azaheterocycles and Their Antimycobacterial and Anticancer Evaluation

2001 ◽  
Vol 71 (3) ◽  
pp. 287-293 ◽  
Author(s):  
Cristina Al Matarneh ◽  
Catalina-Ionica Ciobanu ◽  
Violeta Mangalagiu ◽  
Gheorghita Zbancioc ◽  
Ramona Danac
Keyword(s):  
Breast Cancer ◽  
Prostate Cancer ◽  
Lung Cancer ◽  
Renal Cancer ◽  
Reaction Times ◽  
Antimycobacterial Activity ◽  
Microwave Assisted Synthesis ◽  
Thermal Heating ◽  
Microwave Assisted ◽  
Mw Irradiation

We report herein a comparative study concerning the influence of microwave (MW) irradiation comparative with conventional thermal heating (TH) in the reaction of six member ring azaheterocycles (derived from phenanthroline, quinoline, isoquinoline and phthalazine) with ethyl cyanoformate, and their anticancer and antimycobacterial activity. Under MW irradiation the reactions have some undeniable advantages: the reaction times decrease dramatically (from hours to minutes), the yields are higher, the reactions became selective in some cases (4,7-phenanthrolinium and phthalazinium ylides). The decreasing of reaction time+ from hours to minutes corroborated with the fact that in majority of cases the yield are higher and the selectivity is better, allow us to say that these reactions could be considered as eco-friendly. As far for biological activity, three of the compounds exhibited a significant antitumor activity against some cancer cell lines including prostate cancer, leukemia, renal cancer, lung cancer and breast cancer. The best potency in terms of growth inhibition of tumor cells (~45%) was shown by compound 4a against renal cancer A498 and ovarian cancer SK-OV-3 cells. The tested compounds have not shown any antimycobacterial activity against Mycobacterium tuberculosis.

Microwave-Assisted Synthesis of Zinc Oxide Nanoparticles on Paper

2018 ◽  
Vol 775 ◽  
pp. 163-168
Author(s):  
Saberina I. Saberon ◽  
Monet Concepcion Maguyon-Detras ◽  
Maria Victoria P. Migo ◽  
Marvin U. Herrera ◽  
Ronniel D. Manalo
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Power Level ◽  
Microwave Assisted Synthesis ◽  
Chemical Transformations ◽  
Paper Substrate ◽  
Microwave Assisted ◽  
Higher Power ◽  
Particle Size And Structure ◽  
Scanning Electron

Nanostructured zinc oxide (ZnO) particles were grown on paper substrate made from Abaca hybrid 7 pulp. Microwave irradiation technique was used at power levels (180 and 540W) and exposure times (5, 10, 20 and 25 minutes). Chemical transformations were observed using Fourier Transform Infrared (FTIR) Spectroscopy. The effects of the power levels and exposure times on the morphology of the nanostructures were determined using scanning electron microscopy. FTIR spectra proved the embedment of ZnO on the paper substrate. Power levels and exposure times affected the distribution, particle size and structure of the ZnO nanoparticles. Higher power level and longer exposure resulted to the formation of more ZnO with larger particles. Grainlike and flowerlike ZnO nanostructures were formed at lower and higher levels, respectively.

Microwave-assisted synthesis of novel julolidinyl-based nonlinear optical chromophores with enhanced electro-optic activity

RSC Advances ◽  
2014 ◽  
Vol 4 (110) ◽  
pp. 65088-65097 ◽  
Author(s):  
Airui Zhang ◽  
Hongyan Xiao ◽  
Chengcheng Peng ◽  
Shuhui Bo ◽  
Huajun Xu ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Conventional Heating ◽  
Microwave Assisted Synthesis ◽  
Heating Method ◽  
Microwave Assisted ◽  
Electro Optic ◽  
Mw Irradiation ◽  
Nonlinear Optical Chromophores ◽  
Optical Chromophores

Under microwave (MW) irradiation at a proper temperature, three chromophores (A, B and C) with julolidinyl-based donors and TCF or CF3-Ph-TCF acceptors have been synthesized in high overall yields compared with the conventional heating method.

scholarly journals Microwave-assisted synthesis, characterization and photoluminescence of shuttle-like BaMoO4 microstructure

2015 ◽  
Vol 33 (3) ◽  
pp. 537-540 ◽  
Author(s):  
Anukorn Phuruangrat ◽  
Budsabong Kuntalue ◽  
Titipun Thongtem ◽  
Somchai Thongtem
Keyword(s):  
Electron Microscopy ◽  
Microwave Assisted Synthesis ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted ◽  
Transmission Electron ◽  
Ft Ir ◽  
Xrd Patterns ◽  
Scanning Electron ◽  
Ft Ir Spectroscopy

Abstract Shuttle-like BaMoO4 microstructure has been successfully synthesized from Ba(N03)2·4H20 and Na2MoO4·2H2O as starting materials in ethylene glycol solvent containing 20 mL 5 M NaOH by microwave radiation at 180 W for 30 min. The as- synthesized BaMoO4 product was characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Raman spectrophotometry, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photolumines­cence (PL) spectroscopy. XRD patterns revealed that the products was tetragonal BaMoO4 phase. SEM and TEM characteriza­tion showed that the product had a shuttle-like BaMoO4 microstructure. PL of the shuttle-like BaMoO4 microstructure showed a maximum emission at 466 nm excited by 280 nm wavelength.

Investigations on Microwave Assisted Synthesis and Characterization of Bi2WO6 Nanoparticles

Nano Hybrids ◽  
2015 ◽  
Vol 9 ◽  
pp. 24-32
Author(s):  
Suresh Sagadevan
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Ac Conductivity ◽  
Microwave Assisted Synthesis ◽  
Dielectric Studies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Assisted ◽  
Uv Visible ◽  
Scanning Electron

Bismuth tungstate (Bi2WO6) nanoparticles were synthesized by microwave assisted method. The prepared nanoparticles were investigated by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), UV-visible spectroscopy and dielectric studies. The formation of Bi2WO6nanoparticles was confirmed by X-ray diffraction (XRD). The morphology of Bi2WO6nanoparticle was characterized using scanning electron microscopy SEM. The optical properties were studied by the UV-Visible absorption spectrum. The dielectric properties of Bi2WO6nanoparticles were studied. The activation energy was calculated from AC conductivity studies.Key words: Bi2WO6nanoparticles, XRD, SEM, TEM, UV analysis, Dielectric studies and AC conductivity studies

Scanning and Transmission Microscopy of Nematocyst Batteries in Epitheliomuscular Cells of Hydra

1971 ◽  
Vol 29 ◽  
pp. 410-411 ◽  
Author(s):  
Jane A. Westfall ◽  
S. Yamataka ◽  
Paul D. Enos
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Osmium Tetroxide ◽  
External Surface ◽  
Three Dimensional ◽  
Surface Structures ◽  
Transmission Microscopy ◽  
Transmission Electron ◽  
Freeze Dried ◽  
Scanning Electron

Scanning electron microscopy (SEM) provides three dimensional details of external surface structures and supplements ultrastructural information provided by transmission electron microscopy (TEM). Animals composed of watery jellylike tissues such as hydras and other coelenterates have not been considered suitable for SEM studies because of the difficulty in preserving such organisms in a normal state. This study demonstrates 1) the successful use of SEM on such tissue, and 2) the unique arrangement of batteries of nematocysts within large epitheliomuscular cells on tentacles of Hydra littoralis.Whole specimens of Hydra were prepared for SEM (Figs. 1 and 2) by the fix, freeze-dry, coat technique of Small and Màrszalek. The specimens were fixed in osmium tetroxide and mercuric chloride, freeze-dried in vacuo on a prechilled 1 Kg brass block, and coated with gold-palladium. Tissues for TEM (Figs. 3 and 4) were fixed in glutaraldehyde followed by osmium tetroxide. Scanning micrographs were taken on a Cambridge Stereoscan Mark II A microscope at 10 KV and transmission micrographs were taken on an RCA EMU 3G microscope (Fig. 3) or on a Hitachi HU 11B microscope (Fig. 4).

Electron Microscopic Observation of Biological Specimens in Their Native State by Employing Cryogenic Techniques

1972 ◽  
Vol 30 ◽  
pp. 410-411 ◽  
Author(s):  
Tokio Nei ◽  
Haruo Yotsumoto ◽  
Yoichi Hasegawa ◽  
Yuji Nagasawa
Keyword(s):  
Electron Microscopic Observation ◽  
Surface Structures ◽  
Specimen Preparation ◽  
Native State ◽  
Electron Microscopic ◽  
Biological Specimen ◽  
Specimen Holder ◽  
Cold Stage ◽  
Preparation Techniques ◽  
Scanning Electron

In order to observe biological specimens in their native state, that is, still containing their water content, various methods of specimen preparation have been used, the principal two of which are the chamber method and the freeze method.Using its recently developed cold stage for installation in the pre-evacuation chamber of a scanning electron microscope, we have succeeded in directly observing a biological specimen in its frozen state without the need for such conventional specimen preparation techniques as drying and metallic vacuum evaporation. (Echlin, too, has reported on the observation of surface structures using the same freeze method.)In the experiment referred to herein, a small sliced specimen was place in the specimen holder. After it was rapidly frozen by freon cooled with liquid nitrogen, it was inserted into the cold stage of the specimen chamber.

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