Montmorillonite- hydrothermal carbon nanocomposites: synthesis, characterization and evaluation of pesticides retention for potential treatment of agricultural wastewater

Montmorillonite (M) was modified by addition of hydrothermal carbon (HC) in order to obtain pesticideadsorbent materials. Carbohydrates were used as carbon source, and in some cases, also phosphoric acid wasapplied as activation agent. The M-HC hybrids maintain the negative electrical surface charge of their precursors(between -35 mV and -15 mV), while lower specific surface areas (around 6 m2 g-1) than that of M sample (66m2 g-1) were found. The loss of specific surface could be assigned to the carbon location on both the external andthe interlayer surface of the M sheets, as was confirmed by FTIR, zeta potential measurements and XRDanalysis. For M-HC products obtained by acid treatment, despite their structure alteration, the specific surfacevalues remained similar to that of M sample (around 70 m2 g-1).The M-HC products with or without acid treatment retain almost 100 % adsorption of chlorpyrifos (CPF) andthiabendazole (TBZ) as that obtained for M sample, under the tested conditions. Coagulation studies revealedthat M-HC products evaluated showed better precipitation property than that of M sample, which would precludethe typical montmorillonite gel formation that usually block filters and reactors.Fil: Zelaya Soulé, María Emilia. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Fernández, M. A.. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; ArgentinaFil: Montes, María Luciana. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Física La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Exactas. Instituto de Física La Plata; ArgentinaFil: Suárez García, Fabian. Instituto Nacional del Carbón; EspañaFil: Torres Sanchez, Rosa Maria. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Centro de Tecnología de Recursos Minerales y Cerámica. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Centro de Tecnología de Recursos Minerales y Cerámica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Tascón, J. M. D.. Instituto Nacional del Carbón; Españ

Structures in textured Cu-Al-Ni shape memory thin films grown by sputtering

The structure and texture formation in Cu–Al–Ni thin films of different thicknesses (1 μm to 5 μm) grown by DC magnetron sputtering without any intentional heating of the substrate are reported. The as-grown films present grains with an average size of 20 nm. The films with thickness of 1 μm have a single metastable phase with a hexagonal structure and are textured with planes (0002) parallel to the plane of the films. It was observed that thicker films present phase coexistence between metastable hexagonal and body centered cubic structures with a gradual increment of the body centered cubic phase fraction. The films with thickness of 5 μm are textured with planes (0002) and 1010 n o in the hexagonal structure, whereas in the body centered cubic structure the films are textured with {110} planes parallel to the plane of the films. This fact can be associated with selfheating of the substrate during the growth of the films and with the relative stability of the metastable phases. Free standing films annealed in a second step (1123 K for 1 h) present austenitic phase with L21 structure and sub-micrometric grains textured with {220}L21 planes parallel to the plane of the films. The martensitic transformation temperature was determined from the analysis of resistance against temperature measurements.Fil: Espinoza Torres, Carlos Aurelio. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Condo, Adriana Maria. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Haberkorn, Nestor Fabian. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Zelaya, Maria Eugenia. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Schryvers. D.. Universiteit Antwerpen; BélgicaFil: Guimpel, Julio Juan. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Lovey, Francisco Carlos. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentin

Determinants of Aedes mosquito density as an indicator of arbovirus transmission risk in three sites affected by co-circulation of globally spreading arboviruses in Colombia, Ecuador and Argentina

Background: The global impact of Zika virus in Latin America has drawn renewed attention to circulating mosquito-borne viruses in this region, such as dengue and chikungunya. Our objective was to assess socio-ecological factors associated with Aedes mosquito vector density as a measure of arbovirus transmission risk in three cities of potentially recent Zika virus introduction: Ibagué, Colombia; Manta, Ecuador; and Posadas, Argentina, in order to inform disease mitigation strategies. Methods: We sampled Aedes mosquito populations in a total of 1086 households, using indoor and peridomestic mosquito collection methods, including light traps, resting traps, traps equipped with chemical attractant and aspirators. For each sampled household, we collected socio-economic data using structured questionnaires and data on microenvironmental conditions using iButton data loggers. Results: A total of 3230 female Aedes mosquitoes were collected, of which 99.8% were Aedes aegypti and 0.2% were Aedes albopictus. Mean female Aedes mosquito density per household was 1.71 (standard deviation: 2.84). We used mixed-effects generalized linear Poisson regression analyses to identify predictors of Aedes density, using month, neighborhood and country as random-effects variables. Across study sites, the number of household occupants [incidence rate ratio (IRR): 1.08, 95% confidence interval (CI): 1.01–1.14], presence of entry points for mosquitoes into the household (IRR: 1.51, 95% CI: 1.30–1.76) and presence of decorative vegetation (IRR: 1.52, 95% CI: 1.22–1.88) were associated with higher Aedes density; while being in the highest wealth tertile of household wealth (IRR: 0.78, 95% CI: 0.66–0.92), knowledge of how arboviruses are transmitted (IRR: 0.94, 95% CI: 0.89–1.00) and regular emptying of water containers by occupants (IRR: 0.79, 95% CI: 0.67–0.92) were associated with lower Aedes density. Conclusions: Our study addresses the complexities of arbovirus vectors of global significance at the interface between human and mosquito populations. Our results point to several predictors of Aedes mosquito vector density in countries with co-circulation of multiple Aedes-borne viruses, and point to modifiable risk factors that may be useful for disease prevention and control.Fil: Talbot, Benoit. University of Ottawa; CanadáFil: Sander, Beate. University of Toronto; CanadáFil: Cevallos, Varsovia. Ministerio de Salud Pública. Instituto Nacional de Investigación en Salud Pública Dr. Leopoldo Izquieta Perez; EcuadorFil: González, Camila. Universidad de los Andes; ColombiaFil: Benítez, Denisse. Ministerio de Salud Pública. Instituto Nacional de Investigación en Salud Pública Dr. Leopoldo Izquieta Perez; EcuadorFil: Carissimo, Claudio. Provincia de Misiones. Municipalidad de Posadas; ArgentinaFil: Carrasquilla Ferro, María C.. Universidad de los Andes; ColombiaFil: Gauto, Neris. Provincia de Misiones. Municipalidad de Posadas; ArgentinaFil: Litwiñiuk, Sergio Leandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Universidad Nacional de Misiones. Instituto de Biología Subtropical; ArgentinaFil: López, Karen. Provincia de Misiones. Municipalidad de Posadas; ArgentinaFil: Ortiz, Mario I.. Universidad de los Andes; ColombiaFil: Ponce, Patricio. Ministerio de Salud Pública. Instituto Nacional de Investigación en Salud Pública Dr. Leopoldo Izquieta Perez; EcuadorFil: Villota, Stephany D.. Ministerio de Salud Pública. Instituto Nacional de Investigación en Salud Pública Dr. Leopoldo Izquieta Perez; EcuadorFil: Zelaya, Fabian. Provincia de Misiones. Municipalidad de Posadas; ArgentinaFil: Espinel, Mauricio. Universidad Tecnica de Manabi; EcuadorFil: Wu, Jianhong. University of York; Reino UnidoFil: Miretti, Marcos Mateo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Nordeste. Instituto de Biología Subtropical. Universidad Nacional de Misiones. Instituto de Biología Subtropical; ArgentinaFil: Kulkarni, Manisha A.. University of Ottawa; Canad