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Applied polymer semiconducting polyurethane polypyrrole polyaniline for microorganism immobilization and wastewater treatment in anaerobic aerobic sequential packed bed reactors

IVETH DALILA ANTONIO CARMONA SILVIA YUDITH MARTINEZ AMADOR HUGO MARTÍNEZ GUTIÉRREZ VÍCTOR MANUEL OVANDO MEDINA OMAR GONZALEZ ORTEGA (2015)

"The development of new materials for microorganism immobilization is very important in wastewater treatment. In this work polyurethane (PU) foams were modified polymerizing pyrrole and aniline onto their surface by chemical oxidization to obtain polyurethane/polypyrrole (PU/PPy), polyurethane/polyaniline (PU/PANI), and PU/(PPy-co-PANI) supports which were used to immobilize microorganisms for municipal wastewater treatment in batch mode and continuous flow using two sequential (anaerobic/ aerobic) packed bed reactors (PBR) varying the total hydraulic retention time (HRT). The supports were characterized by Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM) and tested in chemical oxygen demand (COD) removal during treatment of a municipal wastewater. It was observed from SEM analysis that globular nanostructures of PPy and PPy-co-PANI were formed onto the PU surface with average diameters between 100 and 300 nm, which are typical of aqueous polymerization of pyrrole monomer; however irregular nanostructures were observed when PANI was homopolymenzed onto the PU foam. Batch wastewater treatment after 14 days showed COD removal efficiencies of 77%, 69%, 78%, and 80% for PU foam, PU/ PPy, PU/PANI, and PU/(PPy-co-PANI), respectively; which was explained as a function of polymers morphology deposited onto the PU foam surface. Also it was observed from the sequential PBR that for 24 h and 36 h of HRT, 80 and 90% of COD removal can be achieved; respectively.O 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sa. 2015, 132, 42242.2

Article

Bioengineering Conducting polymers Polyurethanes Wastewater CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA

Semiconducting polyurethane polypyrrole polyaniline for microorganism immobilization and wastewater treatment in anaerobic aerobic sequential packed bed reactors

IVETH DALILA ANTONIO CARMONA SILVIA YUDITH MARTINEZ AMADOR HUGO MARTÍNEZ GUTIÉRREZ VÍCTOR MANUEL OVANDO MEDINA OMAR GONZALEZ ORTEGA (2017)

"The development of new materials for microorganism immobilization is very important in wastewater treatment. In this work polyurethane (PU) foams were modified polymerizing pyrrole and aniline onto their surface by chemical oxidization to obtain polyurethane/polypyrrole (PU/PPy), polyurethane/polyaniline (PU/PANI), and PU/(PPy-co-PANI) supports which were used to immobilize microorganisms for municipal wastewater treatment in batch mode and continuous flow using two sequential (anaerobic/ aerobic) packed bed reactors (PBR) varying the total hydraulic retention time (HRT). The supports were characterized by Fourier Transform Infrared (FTIR) spectroscopy and Scanning Electron Microscopy (SEM) and tested in chemical oxygen demand (COD) removal during treatment of a municipal wastewater. It was observed from SEM analysis that globular nanostructures of PPy and PPy-co-PANI were formed onto the PU surface with average diameters between 100 and 300 nm, which are typical of aqueous polymerization of pyrrole monomer; however irregular nanostructures were observed when PANI was homopolymenzed onto the PU foam. Batch wastewater treatment after 14 days showed COD removal efficiencies of 77%, 69%, 78%, and 80% for PU foam, PU/ PPy, PU/PANI, and PU/(PPy-co-PANI), respectively; which was explained as a function of polymers morphology deposited onto the PU foam surface. Also it was observed from the sequential PBR that for 24 h and 36 h of HRT, 80 and 90% of COD removal can be achieved; respectively.O 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sa. 2015, 132, 42242."

Article

Bioengineering Conducting polymers Polyurethanes Wastewater treatment CIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA

IEEE ROC

&

C'2013 Centro Internacional Acapulco

LAURA LUZ VALERO CONZUELO TORIBIO FERNÁNDEZ OTERO Joaquín Arias Padilla (2013)

The synthesis of molecular motors and their design into devices that mimic biological structures such as artificial and technological interest for many years.

Conference object

angles angular rates conducting polymer motor electrochemical motor polymeric actuators CIENCIAS SOCIALES

Conductive Polymer Composites Synthesized from Diacetylene-Functionalized Linseed Oil and MWCNT: Gamma Irradiation and Organic Vapor Sensing

ALEJANDRO RAMIREZ JIMENEZ SUSANA HERNANDEZ LOPEZ EMILIO BUCIO CARRILLO ENRIQUE VIGUERAS SANTIAGO (2017)

Beca de estancia de Posdoctorado del Dr. Alejandro Ramírez Jiménez

Epoxidized linseed oil (ELO) was synthesized and functionalized with propargylamine (PA) or 3-ethynylaniline (EA) and the products were crosslinked to obtain the diacetylene-functionalized epoxidized linseed oil polymers which were used as matrices in the preparation of the composites with multiwalled carbon nanotubes (MWCNTs). Electrical resistance at percentages between 4 and 20 wt/wt% of filler was measured and the percolation threshold was calculated, obtaining 1.2 and 1.7% for the composites with EA and PA respectively. Low critical concentration evidenced a good dispersion of the MWCNTs without necessity of any modification. The final products were used in the sensing of acetone, chloroform and ethanol. The electrical resistance changes were measured at different concentrations and the sensibility was calculated. In order to improve stability toward the vapors, composites were irradiated with gamma rays and new sensing was done and compared. The results showed differences in sensibility, selectivity and reproducibility.

CONACyT

Article

vapor sensing polymer composites plant oils MWCNT Gamma radiation BIOLOGÍA Y QUÍMICA

TRANSIENT ELECTROMAGNETIC RESPONSE OF A CONDUCTING INFINITE CYLINDER EMBEDDEN IN A CONDUCTING MEDIUM

Shri Krishna Singh (1972)

Transient electromagnetic response of a conducting permeable cylinder embedded in a conducting infinite space is obtained in the form of definite integrals. The source is an infinite insulated cable which ties outside the cylinder and carries a Heaviside current. The displacement currents have been neglected. Expression for transient response function under quasi-static approximation is also given.

Article

Transient Electromagnetic Response Conducting Cylinder Transient Electromagnetic Response Conducting Cylinder Seismology concept8601 Seismology CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS DE LA TIERRA Y DEL ESPACIO GEOFÍSICA SISMOLOGÍA Y PROSPECCIÓN SÍSMICA

TRANSIENT ELECTROMAGNETIC RESPOONSE OF A CONDUCTING CYLINDER IN A CONDUCTING MEDIUM: NUMERICAL RESULTS

Shri Krishna Singh (1972)

Numerical results for the transient electromagnetic response of a conducting infinite cylinder embedded in a conducting medium excited by a infinite line source are presented. The input current is a Heaviside function of time. The displacement currents are summed to be negligible in comparison with the conduction currents. The contribution of n = 0 term (induced line current in the cylinder) is shown to predominate over the higher multipoles .As a rough rule the effect of the outer conductivity must be taken into consideration if it is more than 10 -2 times the conductivity of the cylinder.

Article

Transient Electromagnetic Respoonse Cylinder In A Conducting Transient Electromagnetic Respoonse Cylinder In A Conducting Seismology concept8601 Seismology CIENCIAS FÍSICO MATEMÁTICAS Y CIENCIAS DE LA TIERRA CIENCIAS DE LA TIERRA Y DEL ESPACIO GEOFÍSICA SISMOLOGÍA Y PROSPECCIÓN SÍSMICA

Microwave-assisted synthesis of the lipase-catalyzed ring-opening copolymerization of ε-caprolactone and ω-pentadecanolactone: Thermal and FTIR characterization

WILBERTH ANTONIO HERRERA KAO Manuel de Jesús Aguilar Vega JOSE MANUEL CERVANTES UC (2020)

Microwave-assisted synthesis of the lipase-catalyzed ring opening polymerization of ε-caprolactone (ε-CL) and ω-pentadecanolactone (ω-PDL) monomers was studied. A series of P(CL-co-PDL), with different molar feed ratios, including (ε-CL/ω-PDL) 100/0, 75/25, 50/50, 25/75, and 0/100, were synthesized. The resulting polyesters were characterized by Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). The microwave-assisted polymerization of the monomers reached high conversions (91–95%) within 60 min. FTIR spectra showed the typical absorption bands of these polyesters. A very intense band in the carbonyl region, which was shifted from 1,720 cm−1 for PCL to 1,732 cm−1 for PPDL homopolymer, as well as peaks owing to methylene groups in the 2,990–2,850 cm−1 range. DSC results revealed that all polyester samples were semi-crystalline. Interestingly, the copolymers exhibited only one melting peak (Tm), and their Tm values linearly increased from 57°C to 95°C as PPDL concentration was increased. Thermal stability of polyesters also depended on PDL content; an increase in PDL concentration increases polymer degradation temperature (Td).

Article

MICROWAVE-ASSISTED SYNTHESIS LIPASE-CATALYZED RING-OPENING POLYMERIZATION COPOLYESTERS ω-PENTADECANOLACTONE ε-CAPROLACTONE INGENIERÍA Y TECNOLOGÍA CIENCIAS TECNOLÓGICAS TECNOLOGÍA DE MATERIALES PROPIEDADES DE LOS MATERIALES PROPIEDADES DE LOS MATERIALES