924 research outputs found
Novel Ruthenium-Silver PTA-Based Polymers and Their Behavior in Water
New coordination polymers based on two metal-containing moieties Ru–Ag are synthesized: Na[RuCpX(PTA)-μ-(PTA)-1κP:2κ2N-AgX2]∞ (X = Cl (1), Br (2), I (3)). Characterization is performed by NMR, UV-visible and FT-IR spectroscopy, optical-electron microscopy, and elemental analyses (C, H, N, S). Light scattering is employed to characterize the colloidal particles growth by polymer self-assembling. These structures are stable over a broad range of pH and exhibit thermally-driven swelling, thus resembling a typical thermosensitive hydrogel
Water and catalytic isomerization of linear allylic alcohols by [RuCp(H2O-κO)(PTA)2]+ (PTA = 1,3,5-triaza-7- phosphaadamantane)
Catalytic production of jet fuels from biomass
Concerns about depleting fossil fuels and global warming e ects are pushing our society to
search for new renewable sources of energy with the potential to substitute coal, natural gas, and
petroleum. In this sense, biomass, the only renewable source of carbon available on Earth, is the
perfect replacement for petroleum in producing renewable fuels. The aviation sector is responsible
for a significant fraction of greenhouse gas emissions, and two billion barrels of petroleum are being
consumed annually to produce the jet fuels required to transport people and goods around the
world. Governments are pushing directives to replace fossil fuel-derived jet fuels with those derived
from biomass. The present mini review is aimed to summarize the main technologies available
today for converting biomass into liquid hydrocarbon fuels with a molecular weight and structure
suitable for being used as aviation fuels. Particular emphasis will be placed on those routes involving
heterogeneous catalysts
Helicobacter Species and Hepato-Biliary Tract Malignancies: A Systematic Review and Meta-Analysis
Helicobacter species may cause chronic inflammation of the biliary tract, but its relationship with cancer is controversial. We performed a systematic review and meta-analysis to evaluate the association between Helicobacter species and hepatobiliary tract malignancies. Twenty-six studies (4083 patients) were included in qualitative synthesis, and 18 studies (n = 1895 qualified for meta-analysis. All studies were at high-intermediate risk of bias. Most studies combined several direct microbiological methods, mostly PCR (23 studies), culture (8 studies), and/or CLOtest (5 studies). Different specimens alone or in combination were investigated, most frequently bile (16 studies), serum (7 studies), liver/biliary tissue (8 studies), and gastric tissue (3 studies). Patients with Helicobacter species infection had an increased risk of hepatobiliary tract malignancies (OR = 3.61 [95% CI 2.18–6.00]; p < 0.0001), with high heterogeneity in the analysis (I2 = 61%; p = 0.0003). This effect was consistent when Helicobacter was assessed in bile (OR = 3.57 [95% CI 1.73–7.39]; p = 0.0006), gastric tissue (OR = 42.63 [95% CI 5.25–346.24]; p = 0.0004), liver/biliary tissue (OR = 4.92 [95% CI 1.90–12.76]; p = 0.001) and serum (OR = 1.38 [95% CI 1.00–1.90]; p = 0.05). Heterogeneity was reduced in these sub-analyses (I2 = 0–27%; p = ns), except for liver/biliary tissue (I2 = 57%; p = 0.02). In conclusion, based on low-certainty data, Helicobacter species chronic infection is associated with a tripled risk of hepatobiliary tract malignancy. Prospective studies are required to delineate public health interventions
Complejos de rutenio solubles en agua con fosfinas cuosolubles y bases púricas.
Número de publicación: ES2323523 A1 (17.07.2009) También publicado como: ES2323523 B2 21.04.2010 Número de Solicitud: Consulta de Expedientes OEPM (C.E.O.) P200800226(16.01.2008)Complejos de rutenio solubles en agua con fosfinas acuosolubles y bases púricas. La presente invención trata sobre la obtención de complejos de rutenio solubles en agua con fosfinas acuosolubles y bases púricas, de fórmula general 1 en donde Ru representa un átomo de rutenio; Q representa un radical -R1, -R1-NH2, -R1-COOH, -R1-COO-, -R1-OH, -R1-COONCH3, -R1-COONCH2CH3, siendo R1 un grupo alquilo o arilo de hasta 18 carbonos; P representa una fosfina; wP representa una fosfina soluble en agua; Pur representa una base púrica o purina, citosina y timina.Dichos complejos se pueden obtener mediante tres procedimientos diferentes según los productos de partida que se utilicen y sean accesibles o más económicos. A través de la presente invención se pueden obtener una gran variedad de complejos de rutenio por la combinación de los compuestos que se unan al metal.Universidad de AlmerÃ
Células solares constituida por agua y complejos de rutenio con fosfinas acuosolubles: un nuevo tipo de células solares
Publication number: ES2597952 A1 (24.01.2017)
Also published as: ES2597952 B1 (01.12.2017)
Application number: P201500602 (22.07.2015)La presente invención se relaciona con nuevas células solares de colorante constituidas por compuestos de coordinación en agua. Estas células solares son más simples y económicas que las conocidas, como las tipos Crätzel o de semiconductores. Los colorantes de este nuevo tipo de células son compuestos organometálicos acuo-solubles de rutenio. El uso de agua para la fabricación de las células solares permite su fabricación con todo tipo de materiales plásticos, lo que abarata aún más el coste. La presente invención permite el uso de todo tipo de atmósferas, temperaturas inferiores a 100ºC y radiación visible o UV. Las células solares obtenidas son más simples, económicas y fáciles de fabricar que las actualmente conocidas al reducir el número de componentes y usar agua como disolvente.Universidad de AlmerÃ
Aditivacion de resinas epoxi mediante complejos poliméricos homo y heterometálicos con 1,3,5-triaza-7-fosfaadamantanofosfina (PTA) y 3,7-dimetil-1,3,7-triaza-5-phosphabiciclo[3.3.1]nonane (dmoPTA)
Publication number: ES2627009 A1 (26.07.2017)
Also published as: ES2627009 B2 (22.01.2018)
Application number: P201600099 (26.01.2016)La presente invención se relaciona con el uso de polÃmeros homo y heterometálicos con el ligando 1,3,5-triaza-7-fosfaadamantanofosfina (PTA) y 3,7-dimetil-1,3,7-triaza-5-phosphabiciclo[3.3.1]nonane) (dmoPTA), como aditivos de resinas epoxÃdicas. Estos aditivos previa disolución o suspensión mejoran y modifican las propiedades de las resinas confiriéndoles nuevas propiedades como color, conductividad eléctrica y magnética, resistencia térmica y al fuego, flexibilidad, distinto tiempo de curado, entre otras propiedades.Universidad de AlmerÃ
- …