Is the Structural Relaxation of Glasses Controlled by Equilibrium Shear Viscosity?

Knowledge of relaxation processes is fundamental in glass science and technology because relaxation is intrinsically related to vitrification, tempering as well as to annealing and sev-eral applications of glasses. However, there are conflicting reports -- summarized here for different glasses -- on whether the structural relaxation time of glass can be calculated using the Maxwell equation, which relates relaxation time with shear viscosity and shear modulus. Hence, this study aimed to verify whether these two relaxation times are comparable. The structural relaxation kinetics of a lead metasilicate glass were studied by measuring the re-fractive index variation over time at temperatures between 5 and 25 K below the fictive temperature, which was initially set 5 K below the glass transition temperature. Equilibrium shear viscosity was measured above and below the glass transition range, expanding the current knowledge by one order of magnitude. The Kohlrausch equation described very well the experimental structural relaxation kinetics throughout the investigated temperature range and the Kohlrausch exponent increased with temperature, in agreement with studies on other glasses. The experimental average structural relaxation times were much longer than the values computed from isostructural viscosity, as expected. Still, they were less than one order of magnitude higher than the average relaxation time computed through the Maxwell equation, which relies on equilibrium shear viscosity. Thus, these results demon-strate that the structural relaxation process is not controlled by isostructural viscosity, and that equilibrium shear viscosity only provides a lower boundary for structural relaxation kinetics.Comment: 19 pages, 8 figures. Changed title. Minor updates to the tex

Bulk photochromism in a tungstate-phosphate glass: A new optical memory material?

In this work, we present a new photochromic tungstate based glass which have both absorption coefficient and refractive index modified under laser exposure. The photosensitive effect is superficial under ultraviolet (UV) irradiation but occurs in the entire volume of the glass under visible irradiation. The effect can be obtained in any specific point inside the volume using an infrared femtosecond laser. In addition, the photosensitive phenomenon can be erased by specific heat treatment. This glass can be useful to substitute actual data storage supports and is a promising material for 3-dimensional (3D) and holographic optical storage.Univ Fed Alfenas, UNIFAL, Dept Ciências Exatas, BR-37130000 Alfenas, MG, BrazilUniv Estadual Campinas, Inst Fis Gleb Wataghin, Dept Condensed Matter Phys, Lab Opt, BR-13083970 Campinas, SP, BrazilUNESP, Inst Quim, Lab Photon Mat, BR-14800900 Araraquara, SP, BrazilUNESP, Inst Quim, Lab Photon Mat, BR-14800900 Araraquara, SP, Brazi

Influence of silver precursors on growth of metallic nanoparticles in heavy metal oxide glasses

In this work we report a systematic study on the influence of the chemical nature of silver precursors on the formation of glass-ceramics from oxide glasses. Thermal, structural and optical properties were analyzed as a function of the glass composition. Controlled crystallization was achieved by thermal treatment of the samples above glass transition. The influence of time of treatment on both nanoparticle growth and optical properties of the samples was studied by transmission electron microscopy and UV-Vis spectroscopy, respectively. Results showed that only glasses containing AgCl and AgNO3 led to glass-ceramics growth after thermal treatment.CNPqCAPESFAPESP/CEPI

ÁGUA TRATADA MAGNETICAMENTE APLICADA EM DÉFICIT HÍDRICO TRAZ BENEFÍCIOS NO CRESCIMENTO E DESENVOLVIMENTO D A CULTURA DO JILÓ ?

Objetivou- se com este trabalho avaliar o efeito da irrigação com água modificada magneticamente no crescimento desenvolvimento da cultura do jiló (Solanum gilo Raddi), cultivar Morro Grande. Foi utilizado o delineamento estatístico inteiramente casualizado com esquema fatorial 3x2 com três repetições, considerando- se como unidade experimental um canteiro com quatro plantas espaçadas em 0,75 m entre plantas e 1,00 m entre linhas. Os fatores consistiram na irrigação utilizando água tratada magneticamente e sem tratamento magnético e três reposições de lâminas de irrigação para o primeiro ciclo (50%, 75% e 100% ETc). Foram avaliadas as variáveis diâmetro de caule, altura de planta, massa seca da parte aérea, primeira inflorescência e frutificação. O fator tratamento magnético da água não apresentou resultados positivos para a cultura em questão. Entretanto, para as variáveis diâmetro de caule, altura de planta, massa seca da parte aérea, o fator lâmina de reposição que obteve diferenças significativas entre os tratamentos

GERMINAÇÃO DE MUDAS DE PIMENTÃO COM APLICAÇÃO DE ÁGUA TRATADA MAGNETICAMENTE

O cultivo do pimentão inicia- se em viveiros a fim de obter mudas uniformes e vigorosas para serem transplantadas. Objetivou- se, com este estudo, avaliar a aplicação de água tratada magneticamente na germinação de mudas de pimentão. O experimento foi conduzido em ambiente protegido no Centro Técnico de Irrigação (CTI/UEM) – Maringá/PR em bandejas de polietileno de 50 células preenchidas com substrato comercial (Su) e mistura de substrato comercial + solo (SS). Para obter água tratada magneticamente utilizou- se um magnetizador Sylocimol Residence (Timol). No teste de germinação as mudas foram irrigadas diariamente conforme o tratamento correspondente e quantificadas nos primeiros 15 dias após a emergência para obter a porcentagem de germinação e a porcentagem final emergida (PFE) . Os resultados demostraram que aplicação de água tratada magneticamente promoveu a germinação um dia antes das irrigadas sem tratamento quando cultivadas com a mistura SS. A variável PFE foi significativa apenas às formas de cultivo, sendo que o cultivo em SS apresentou valores superiores quando comparado ao cultivo em Su

PREPARATION OF GLASSES AND GLASS CERAMICS OF HEAVY METAL OXIDES CONTAINING SILVER: OPTICAL, STRUCTURAL AND ELECTROCHEMICAL PROPERTIES

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)PREPARATION OF GLASSES AND GLASS CERAMICS OF HEAVY METAL OXIDES CONTAINING SILVER: OPTICAL, STRUCTURAL AND ELECTROCHEMICAL PROPERTIES. Silver containing heavy metal oxide glasses and glass ceramics of the system WO3-SbPO4-PbO-AgCl with different AgCl contents have been prepared and their thermal, structural and optical properties characterized. Glass ceramics containing metallic silver nanoparticles have been prepared by annealing glass samples at temperatures above the glass transition and analyzed by transmission electron microscopy and energy dispersive X-ray microanalysis. The presence of the metallic clusters has been also confirmed by the observation of a surface plasmon resonimce band in the visible range. Cyclic voltammetric measurements indicated the presence of metallic silver into the glasses, even before to perform the thermal treatment.354755761Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Strain Classification of Mycobacterium tuberculosis Isolates in Brazil Based on Genotypes Obtained by Spoligotyping, Mycobacterial Interspersed Repetitive Unit Typing and the Presence of Large Sequence and Single Nucleotide Polymorphism

International audienceRio de Janeiro is endemic for tuberculosis (TB) and presents the second largest prevalence of the disease in Brazil. Here, we present the bacterial population structure of 218 isolates of Mycobacterium tuberculosis, derived from 186 patients that were diagnosed between January 2008 and December 2009. Genotypes were generated by means of spoligotyping, 24 MIRU-VNTR typing and presence of fbpC103, RDRio and RD174. The results confirmed earlier data that predominant genotypes in Rio de Janeiro are those of the Euro American Lineages (99%). However, we observed differences between the classification by spoligotyping when comparing to that of 24 MIRU-VNTR typing, being respectively 43.6% vs. 62.4% of LAM, 34.9% vs. 9.6% of T and 18.3% vs. 21.5% of Haarlem. Among isolates classified as LAM by MIRU typing, 28.0% did not present the characteristic spoligotype profile with absence of spacers 21 to 24 and 32 to 36 and we designated these conveniently as "LAM-like", 79.3% of these presenting the LAM-specific SNP fbpC103. The frequency of RDRio and RD174 in the LAM strains, as defined both by spoligotyping and 24 MIRU-VNTR loci, were respectively 11% and 15.4%, demonstrating that RD174 is not always a marker for LAM/RDRio strains. We conclude that, although spoligotyping alone is a tool for classification of strains of the Euro-American lineage, when combined with MIRU-VNTRs, SNPs and RD typing, it leads to a much better understanding of the bacterial population structure and phylogenetic relationships among strains of M. tuberculosis in regions with high incidence of TB

Experimental and Theoretical Study of SbPO4 under Compression

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Inorganic Chemistry, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.inorgchem.9b02268.[EN] SbPO4 is a complex monoclinic layered material characterized by a strong activity of the nonbonding lone electron pair (LEP) of Sb. The strong cation LEP leads to the formation of layers piled up along the a axis and linked by weak SbO electrostatic interactions. In fact, Sb has 4-fold coordination with O similarly to what occurs with the P-O coordination, despite the large difference in ionic radii and electronegativity between both elements. Here we report a joint experimental and theoretical study of the structural and vibrational properties of SbPO4 at high pressure. We show that SbPO4 is not only one of the most compressible phosphates but also one of the most compressible compounds of the ABO(4) family. Moreover, it has a considerable anisotropic compression behavior, with the largest compression occurring along a direction close to the a axis and governed by the compression of the LEP and the weak interlayer Sb-O bonds. The strong compression along the a axis leads to a subtle modification of the monoclinic crystal structure above 3 GPa, leading from a 2D to a 3D material. Moreover, the onset of a reversible pressure-induced phase transition is observed above 9 GPa, which is completed above 20 GPa. We propose that the high-pressure phase is a triclinic distortion of the original monoclinic phase. The understanding of the compression mechanism of SbPO4 can aid to improve the ion intercalation and catalytic properties of this layered compound.The authors acknowledge financial support from the Brazilian Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq - 159754/2018-6, 307199/2018-5, 422250/20163, 201050/2012-9), FAPESP (2013/07793-6), Spanish Ministerio de Economia y Competitividad (MINECO) under projects MALTA Consolider Ingenio 2010 network (MAT2015-71070-REDC and RED2018-102612-T), MAT2016-75586-C4-1/2/3-P, PGC2018-097520-A-I00, FIS2017-83295-P, and PGC2018-094417-B-I00 from Generalitat Valenciana under project PROMETEO/2018/123, and the European Comission under project COMEX. D.S.-P., JA.S., and A.O.d.l.R. acknowledge "Ramim y Cajal" Fellowships for financial support (RyC-2014-15643, RYC-2015-17482, and RyC-2016-20301, respectively). E.L.d. 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