We show that particle size, morphology, nanocrystallinity, surface area, and defect density of (Y,Eu)VO4 structures can be tuned by one-pot colloidal conversion of rare earth hydroxycarbonates in water/ethylene glycol (EG)...

<p><span style="font-size: medium;">Glyphosate, a non-selective herbicide with systemic action, is one of the most widely used substances in modern agriculture. With the objective of comparing the efficiency of glyphosate previously complexed with copper (Cu421) with that of the commercial product (Roundup WG®) and the purified substance (purified glyphosate) in controlling <em>Brachiaria decumbens </em>Stapf (signal grass), tests were conducted of the <em>in vitro </em>and <em>in vivo </em>activity of the enzymes 5-enolpyruvylshikimate-3-phosphate synthase (EPSPs) and phenylalanine ammonia lyase (PAL). The Cu421 complex significantly inhibited the EPSPs activity, as did the commercial product. <em>In vivo </em>test showed that treatments increased PAL activity more than double. The Cu421 complexed caused a substantial decline in the Falker chlorophyll index, as well as, the greatest reduction in the fresh mass yield and total protein concentration. In addition, the Cu 421 complexed application resulted in an increase in N-NO3- content in <em>B. decumbens</em>. The Cu421 complex had similar action as Roundup WG® and the purified glyphosate, indicating the possibility of using this complex to control weeds.</span></p>

Lanthanide-doped sodium yttrium tetrafluoride nanoparticles show intense upconversion emissions which raise great attention in a variety of luminescence applications. This host lattice shows specially attractive properties in its hexagonal phase, which normally requires high temperature reactions and complex procedures to be synthesized. In this work, we synthesized nano-and micro-sized NaYF4 particles with controllable cubic or hexagonal structure via sacrificial colloidal template method under mild conditions of 50 ºC/1 atm in a 3 h-long reaction.

Aos meu pais Adriana e Ricardo, que nunca deixaram de acreditar em meu potencial, por todos os conselhos e apoio. Sempre serei grata a vocês! Vocês são e sempre serão minha admiração. Agradeço imensamente ao prof. Paulo Cesar por ter me cedido um espaço em seu grupo de pesquisa. Obrigada pelo ensino e paciência durante estes dois anos! Agradeço aos amigos cultivados durante este tempo, Rafael, Milena, Giulia e Gustavo. Estar no laboratório todos os dias com vocês sempre foi divertido. Obrigada por todas as conversas, conselhos e ajuda para as discussões deste trabalho! À minha irmã Carolina, por todo o apoio e amor. Você sempre foi essencial em todos os momentos, obrigada por ser presente em todos estes anos! Aos meus amigos Lucas, Dominique e Marina, que mesmo longe, sempre foram muito presentes em minha vida. Obrigada por todas as risadas, brincadeiras e pela sincera amizade, meu muito obrigada. Amo vocês! Um agradecimento especial a minha avó Nereide, que sempre orou por mim, apoiou e incentivou a fé para não desistir. As incríveis pessoas que conheci em Campinas, em especial a Ya e Caio, pela imensa amizade, paciência, conselhos e abraços que me ajudaram, e tanto, durante todo este tempo. Me sinto imensamente abençoada por ter vocês em minha vida. Agradeço a todos do IQ/UNICAMP, em especial ao LQES por ter disponibilizado o ASAP para análises. Agradeço a CNPq pela bolsa concedida (processo n° 134526/2017-1). Agradeço a FAPESP pelo auxílio concedido para estágio na Universidade de Warwick (SPRINT-FAPESP 2018/08334-9).

The partial dissolution of orthophosphate ions into yttrium orthovanadate lattices led to an enhancement of the luminescence of orthovanadate groups. The combination of the luminescence of vanadate ions with emissions of lanthanide ions can be used to develop self-calibrating optical thermometers with two emitting centers in the same lattice. In this sense, europium(III)-doped yttrium orthovanadate particles containing different amounts of phosphate ions (x=0, 0.05, 0.10, 0.20, 0.30, 0.40 and 1) were prepared by hydrothermal synthesis. The XRD patterns confirmed the formation of solid solutions with tetragonal zircon-type structure. The luminescence analysis showed that composition with 20% of phosphate ions show comparably intense emissions from vanadate groups and europium(III) ions, which is potentially applicable inn ratiometric temperature measurements via two-center downshift luminescence. Additional studies using trivalent thulium and erbium as activators can extend de applicability of the material by enabling dual downshift/upconversion thermometry.