RESUMEN
There is a need for safe and sustainable alternatives in the coating industry. Bio-based coatings are interesting in this perspective. Although various oils and waxes have been used as traditional wood coatings, they often lack sufficient durability. Lignin is an abundant natural polyphenol that can be used to cure epoxies, but its poor water solubility has impeded the use of unmodified lignin in coatings in the past. To address this issue, water-dispersible colloidal lignin particles (CLPs) and an epoxy compound, glycerol diglycidyl ether (GDE), were used to prepare multiprotective bio-based surface coatings. With the GDE/CLP ratios of 0.65 and 0.52 g/g, the cured CLP-GDE films became highly resistant to abrasion and heat. When applied as a coating on wooden substrates, the particulate morphology enabled effective protection against water, stains, and sunlight with very thin layers (less than half the weight of commercial coatings) while retaining the wood's breathability excellently. Optimal hydrophobicity was reached with a coat weight of 6.9 g(CLP)/m2, resulting in water contact angle values of up to 120°. Due to their spherical shape and chemical structure, the CLPs acted as both a hardener and a particulate component in the coating, which removed the need for an underlying binding polymer matrix. Light interferometry measurements showed that while commercial polymeric film-forming coatings smoothened the substrate noticeably, the particulate morphology retained the substrate's roughness in lightweight coatings, allowing for a high water contact angle. This work presents new strategies for lignin applications in durable particulate coatings and their advantages compared to both currently used synthetic and bio-based coatings.
Asunto(s)
Coloides/química , Compuestos Epoxi/química , Éteres de Glicerilo/química , Lignina/química , Nanopartículas/química , Coloides/efectos de la radiación , Compuestos Epoxi/efectos de la radiación , Éteres de Glicerilo/efectos de la radiación , Interacciones Hidrofóbicas e Hidrofílicas , Luz , Lignina/efectos de la radiación , Ensayo de Materiales , Nanopartículas/efectos de la radiación , Pinus , Propiedades de Superficie , Temperatura , Agua/química , Madera/químicaRESUMEN
Natural musculoskeletal systems have been widely recognized as an advanced robotic model for designing robust yet flexible microbots. However, the development of artificial musculoskeletal systems at micro-nanoscale currently remains a big challenge, since it requires precise assembly of two or more materials of distinct properties into complex 3D micro/nanostructures. In this study, we report femtosecond laser programmed artificial musculoskeletal systems for prototyping 3D microbots, using relatively stiff SU-8 as the skeleton and pH-responsive protein (bovine serum albumin, BSA) as the smart muscle. To realize the programmable integration of the two materials into a 3D configuration, a successive on-chip two-photon polymerization (TPP) strategy that enables structuring two photosensitive materials sequentially within a predesigned configuration was proposed. As a proof-of-concept, we demonstrate a pH-responsive spider microbot and a 3D smart micro-gripper that enables controllable grabbing and releasing. Our strategy provides a universal protocol for directly printing 3D microbots composed of multiple materials.
Asunto(s)
Biomimética/métodos , Compuestos Epoxi/efectos de la radiación , Fenómenos Fisiológicos Musculoesqueléticos , Polímeros/efectos de la radiación , Robótica/métodos , Albúmina Sérica Bovina/efectos de la radiación , Biomimética/instrumentación , Compuestos Epoxi/química , Hidrogeles/química , Hidrogeles/efectos de la radiación , Concentración de Iones de Hidrógeno , Rayos Láser , Polimerizacion/efectos de la radiación , Polímeros/química , Impresión Tridimensional , Robótica/instrumentación , Albúmina Sérica Bovina/químicaRESUMEN
Gamma-ray radiation was used as a clean and easy method for turning the physicochemical properties of graphene oxide (GO) in this study. Silane functionalized-GO were synthesized by chemically grafting 3-aminopropyltriethoxysilane (APTES) and 3-glycidyloxypropyltrimethoxysilane (GPTES) onto GO surface using gamma-ray irradiation. This established non-contact process is used to create a reductive medium which is deemed simpler, purer and less harmful compared conventional chemical reduction. The resulting functionalized-GO were characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), thermogravimetric analysis (TGA), and Raman spectroscopy. The chemical interaction of silane with the GO surface was confirmed by FT-IR. X-ray diffraction reveals the change in the crystalline phases was due to surface functionalization. Surface defects of the GO due to the introduction of silane mioties was revealed by Raman spectroscopy. Thermogravimetric analysis of the functionalized-GO exhibits a multiple peaks in the temperature range of 200-650 °C which corresponds to the degradation of chemically grafted silane on the GO surface.
Asunto(s)
Grafito/química , Compuestos de Organosilicio/química , Propilaminas/química , Silanos/química , Compuestos Epoxi/síntesis química , Compuestos Epoxi/química , Compuestos Epoxi/efectos de la radiación , Rayos gamma , Grafito/síntesis química , Grafito/efectos de la radiación , Microscopía Electrónica de Rastreo , Compuestos de Organosilicio/efectos de la radiación , Propilaminas/síntesis química , Propilaminas/efectos de la radiación , Silanos/síntesis química , Silanos/efectos de la radiación , Espectroscopía Infrarroja por Transformada de Fourier , Espectrometría Raman , Propiedades de Superficie/efectos de la radiación , Temperatura , Termogravimetría , Difracción de Rayos XRESUMEN
The effect of epoxidation on strain-induced crystallization (SIC) of epoxidized natural rubber (ENR) and mechanism are studied with synchrotron radiation wide-angle X-ray diffraction (SR-WAXD) and polarized infrared spectroscopy (P-IR). WAXD results reveal that appropriate epoxidation, for example, ENR-25 epoxidized with ≈25% isoprene units, can unexpectedly enhance the SIC of natural rubber (NR), resulting in the improvement of tear resistance. On the other hand, exorbitant epoxidation, for example, ENR-40 epoxidized with ≈40% isoprene units, depresses the SIC and weakens the mechanical properties of NR remarkably. P-IR studies reveal that epoxidation can promote the orientation of chain segments along the stretching direction, which plays a determining role on SIC of NR. Accordingly, hierarchical multiscale schematic models are proposed. This insight into epoxidation on SIC of ENR strongly suggests that ENR with appropriate epoxidation degree is a promising candidate material for the fabrication of high-performance engineering rubber products.
Asunto(s)
Butadienos/química , Compuestos Epoxi/química , Hemiterpenos/química , Goma/química , Cristalización , Compuestos Epoxi/efectos de la radiación , Espectrofotometría Infrarroja , Sincrotrones , Temperatura , Difracción de Rayos XRESUMEN
In this paper, we present a disposable inkjet dispenser platform technology and demonstrate the Lab-on-a-Printer concept, an extension of the ubiquitous Lab-on-a-Chip concept, whereby microfluidic modules are directly integrated into the printhead. The concept is demonstrated here through the integration of an inkjet dispenser and a microfluidic mixer enabling control over droplet composition from a single nozzle in real-time during printing. The inkjet dispenser is based on a modular design platform that enables the low-cost microfluidic component and the more expensive actuation unit to be easily separated, allowing for the optional disposal of the former and reuse of the latter. To limit satellite droplet formation, a hydrophobic-coated and tapered micronozzle was microfabricated and integrated with the fluidics to realize the dispenser. The microfabricated devices generated droplets with diameters ranging from 150-220 µm, depending mainly on the orifice diameter, with printing rates up to 8000 droplets per second. The inkjet dispenser is capable of dispensing materials with a viscosity up to â¼19 mPa s. As a demonstration of the inkjet dispenser function and application, we have printed type I collagen seeded with human liver carcinoma cells (cell line HepG2), to form patterned biological structures.
Asunto(s)
Técnicas de Cultivo de Célula/instrumentación , Diseño de Equipo , Hepatoblastoma/patología , Dispositivos Laboratorio en un Chip , Neoplasias Hepáticas/patología , Microtecnología/métodos , Impresión Tridimensional , Células Inmovilizadas , Colágeno Tipo I/química , Colágeno Tipo I/metabolismo , Diseño Asistido por Computadora , Dimetilpolisiloxanos/química , Equipos Desechables , Compuestos Epoxi/química , Compuestos Epoxi/efectos de la radiación , Células Hep G2 , Hepatoblastoma/metabolismo , Humanos , Interacciones Hidrofóbicas e Hidrofílicas/efectos de la radiación , Neoplasias Hepáticas/metabolismo , Estereolitografía , Propiedades de Superficie , Rayos Ultravioleta , Viscosidad/efectos de la radiaciónRESUMEN
Photoactivated orientation of gold nanorods (AuNRs) incorporated into polymethylmethacrylate and SU-8 photoresist films occurs under red light activation. Excitation of the longitudinal surface plasmon resonance band leads to selective orientation of the nanostructures, revealed by a change in the absorption spectra.
Asunto(s)
Compuestos Epoxi , Oro/química , Nanotubos/química , Nanotubos/efectos de la radiación , Polímeros , Polimetil Metacrilato , Resonancia por Plasmón de Superficie , Compuestos Epoxi/química , Compuestos Epoxi/efectos de la radiación , Luz , Tamaño de la Partícula , Polímeros/química , Polímeros/efectos de la radiación , Polimetil Metacrilato/química , Polimetil Metacrilato/efectos de la radiaciónRESUMEN
Elastic wave mixing using an immersion method has shown effective monitoring and scanning capabilities when applied to thermoplastic ageing, epoxy curing, and non-destructive testing. In water, excitation and reception of waves do not require physical contact between the tools and the specimen, making the acquisition of high-resolution C-scans possible. The nonlinear material parameters exhibit a much higher sensitivity to the specimen state compared to linear ones. Thus, the nonlinear data for polymethyl methacrylate (PMMA) have a 40% difference between zones of "young" and "aged" material, while the linear data show no difference at all. Methodology and logistics of the immersion wave-mixing method are discussed in detail. Monitoring of epoxy curing has also revealed a good sensitivity of the method to this complex process including several characteristic stages, such as the time of maximal viscosity, the gel time, and the vitrification time. These stages are independently verified in separate rheometry measurements. The presented method allows for a number of possibilities: wave-mode and frequency separations, elimination of surrounding medium influence, "steering" (scanning) a scattered wave, controlling the location of the intersection volume, single-sided or double-sided measurements, and operation in detector mode.
Asunto(s)
Diagnóstico por Imagen de Elasticidad/métodos , Compuestos Epoxi/química , Compuestos Epoxi/efectos de la radiación , Ensayo de Materiales/métodos , Polimetil Metacrilato/química , Polimetil Metacrilato/efectos de la radiación , Ultrasonografía/métodos , Dureza , Calor , Dinámicas no Lineales , Polimetil Metacrilato/análisis , Reología/métodos , Agua/químicaRESUMEN
Assessing pesticide fate in conservation agricultural systems requires a detailed understanding of their interaction with decomposing surface crop residues (mulch). Adsorption and desorption behavior of glyphosate, s-metolachlor and epoxiconazole was investigated on maize mulch residues decomposed under laboratory and field conditions. Our conceptual approach included characterization of chemical composition and hydrophobicity of mulch residues in order to generate parameters to predict sorption behavior. Adsorption of s-metolachlor and epoxiconazole greatly increased with mulch decomposition, whereas glyphosate adsorption was less affected but its desorption was increased. Mulch characteristics including aromaticity, hydrophobicity and polarity indices were strongly correlated to Koc of the non-ionic pesticides. A predictive model based on compositional data (CoDa) analysis revealed that the sorption capacity of decomposing mulch can be predicted from descriptors such as aromatic and alkyl C corresponding respectively to lignin and NDF biochemical fractions. The decomposition degree of mulch residues should be taken into account while predicting the fate of pesticides.
Asunto(s)
Exposición a Riesgos Ambientales , Fungicidas Industriales/metabolismo , Herbicidas/metabolismo , Contaminantes del Suelo/metabolismo , Zea mays/metabolismo , Acetamidas/química , Acetamidas/metabolismo , Acetamidas/efectos de la radiación , Adsorción , Clima , Monitoreo del Ambiente , Compuestos Epoxi/química , Compuestos Epoxi/metabolismo , Compuestos Epoxi/efectos de la radiación , Fungicidas Industriales/química , Fungicidas Industriales/efectos de la radiación , Glicina/análogos & derivados , Glicina/química , Glicina/metabolismo , Glicina/efectos de la radiación , Herbicidas/química , Herbicidas/efectos de la radiación , Luz , Espectroscopía de Resonancia Magnética , Modelos Químicos , Tallos de la Planta/química , Tallos de la Planta/metabolismo , Tallos de la Planta/efectos de la radiación , Lluvia , Contaminantes del Suelo/química , Contaminantes del Suelo/efectos de la radiación , Triazoles/química , Triazoles/metabolismo , Triazoles/efectos de la radiación , Zea mays/química , Zea mays/efectos de la radiación , GlifosatoRESUMEN
This work deals with thermal aspect of the microwaves processing by applying the dielectric effect of attenuation inversion of electromagnetic wave as a solution for uniform treatment. Interest is devoted to the description of electromagnetic and chemical thermal contributions present during microwave heating of a thermosat material. An analytic methods was complemented with experimental data obtained by DSC. The chemical heat contribution is modeled by two methods: analytical and an experimental. The composite was characterized in terms of the reaction progress. The coupled electromagnetic, chemical and thermal model show results that can be evaluated from the temperature evolution. There is an strong rise in the temperature in one point, which is due to the non uniformity of the heat-storage capacity along the composite to be treated. The region of validation of the model is also shown.
Asunto(s)
Compuestos Epoxi/química , Compuestos Epoxi/efectos de la radiación , Vidrio/química , Vidrio/efectos de la radiación , Calefacción/métodos , Microondas , Modelos Químicos , Simulación por Computador , Relación Dosis-Respuesta en la Radiación , Ensayo de MaterialesRESUMEN
In this proof of concept study, the advantageous properties of both H(2)O(2)/NaHCO(3)/imidazole/Mn(TPP)OAc oxidation system and MOPyrroNTf(2) ionic liquid have been combined under ultrasonic irradiation to give an exceptionally favorable environment for Mn(TPP)OAc catalyzed olefin oxidations. The results reveal the crucial role played by the ultrasonic irradiations that influence drastically the oxidation process. In MOPyrroNTf(2) and under ultrasonic irradiation, the mechanism probably involves an oxo-manganyl intermediate at the expense of the classical bicarbonate-activated peroxide route.
Asunto(s)
Alquenos/química , Alquenos/efectos de la radiación , Compuestos Epoxi/química , Compuestos Epoxi/efectos de la radiación , Líquidos Iónicos/química , Líquidos Iónicos/efectos de la radiación , Sonicación/métodos , Ondas de Choque de Alta Energía , Dosis de RadiaciónRESUMEN
Ruthenium-exchanged FAU-Y zeolite (RuY) was used as a recyclable catalyst for regioselective ring-opening of epoxides with indoles under irradiation of sonic waves. It was found that a solvent free process, under the above mentioned conditions provides good yields of the desired 3-alkylated indole derivatives.
Asunto(s)
Compuestos Epoxi/química , Compuestos Epoxi/efectos de la radiación , Rutenio/química , Rutenio/efectos de la radiación , Sonicación/métodos , Zeolitas/química , Zeolitas/efectos de la radiación , Catálisis/efectos de la radiación , Ondas de Choque de Alta Energía , Indoles/química , Indoles/efectos de la radiación , Dosis de Radiación , Solventes/química , Solventes/efectos de la radiaciónRESUMEN
Ion exchange adsorbents based on cellulosic fabric wastes carrying sulfonic acid and amine functional groups were synthesized by radiation-induced graft polymerization of glycidyl methacrylate (GMA) with subsequent chemical modification of the epoxy groups of poly-GMA graft chains with sodium sulfite/H(2)SO(4) and triethylamine, respectively. The conversion of epoxy groups into the functional groups was investigated. Factors affecting on grafting process such as radiation dose, monomer concentration and solvent were studied. The synthesized adsorbent and its applications in the removal of different types of hazardous pollutants e.g. acidic dye, cobalt, dichromate and phenols from aqueous solution were also studied.
Asunto(s)
Compuestos Epoxi/química , Residuos Peligrosos/prevención & control , Metacrilatos/química , Contaminantes Químicos del Agua/aislamiento & purificación , Adsorción , Conservación de los Recursos Naturales/métodos , Compuestos Epoxi/efectos de la radiación , Residuos Industriales , Intercambio Iónico , Metacrilatos/efectos de la radiación , Soluciones , TextilesRESUMEN
We present a simple, fast, and repeatable method for fabricating nano-fluidic channels based on two-photon absorption (TPA) polymerization. Since our method does not require any mask, it is relatively cheaper and faster than other conventional lithography techniques. We illustrate that SU-8 has pronounced photoinitiation threshold behavior, which linearly decreases as the repetition rate increases. If the pulse energy and the repetition rate are controlled, channel width can be easily controlled. We report fluidic channels up to 110 nm in width, between polymerized parallel ribs, utilizing TPA and the photoinitiation threshold properties of SU-8. Finally, we also show that high repetition rate laser presents greater controllability in size of the polymerized region by varying fluence.
Asunto(s)
Compuestos Epoxi/química , Compuestos Epoxi/efectos de la radiación , Técnicas Analíticas Microfluídicas/instrumentación , Nanoestructuras/química , Nanoestructuras/efectos de la radiación , Nanotecnología/instrumentación , Nanotecnología/métodos , Polímeros/química , Polímeros/efectos de la radiación , Diseño de Equipo , Análisis de Falla de Equipo , Vidrio/química , Ensayo de Materiales , Técnicas Analíticas Microfluídicas/métodos , Fotoquímica/métodos , Fotones , Reproducibilidad de los Resultados , Sensibilidad y EspecificidadRESUMEN
Two homochiral dimers of glycidol, deriving from two different conformers, have been characterized by rotational spectroscopy in a supersonic expansion.
Asunto(s)
Compuestos Epoxi/química , Modelos Químicos , Propanoles/química , Dimerización , Compuestos Epoxi/efectos de la radiación , Enlace de Hidrógeno , Microondas , Conformación Molecular , Propanoles/efectos de la radiación , RotaciónRESUMEN
The micropallet array system uses a pulsed laser to release pallets tens of microns to hundreds of micrometers in size from a larger array, enabling selective isolation of single cells adherent to the pallets. We characterize the laser-based release of pallets with respect to pallet array and laser parameters. The threshold laser energy required for pallet release increases linearly with the area of the pallet in contact with the underlying glass substrate. The spacing of the pallets within an array as well as the thickness or height of the pallet does not impact the energy required to release a pallet. Delivery of multiple laser pulses decreases the energy/pulse required for pallet release when the pallets were 100 microm or greater on a side. In addition to the square pallets, complex structures such as cantilevers and spirals could be released without damage using the pulsed laser. Identification of the pallet-array variables influencing the energy required for pallet release as well as strategies to minimize this energy will prove critical in optimizing the release of pallets with cells on the arrays.
Asunto(s)
Separación Celular/métodos , Compuestos Epoxi/química , Compuestos Epoxi/efectos de la radiación , Rayos Láser , Sustancias Macromoleculares/química , Sustancias Macromoleculares/efectos de la radiación , Microesferas , Modelos Químicos , Polímeros/química , Polímeros/efectos de la radiación , Simulación por Computador , Dosis de RadiaciónRESUMEN
OBJECTIVES: The aim of this study was to investigate the kinetics and mechanical properties of dimethacrylate monomer based on cycloaliphatic epoxide for dental restorative composite. METHODS: Dimethacrylate based on cycloaliphatic epoxide (EPCDMA) was copolymeirzed with TEGDMA by varying the curing conditions: monomer composition and light intensity. A real-time near FTIR technique was employed to monitor the double bond conversion and the rate of polymerization. Dynamic mechanical analysis was performed on a dynamic mechanical analyzer, and volume shrinkage of the cured samples was determined by pycnometric method. RESULTS: The results of kinetics showed that, two peaks of maximum rate of polymerization (Rpmax) occurred when the amount of TEGDMA was more than 30wt%. Increasing the amount of TEGDMA, the final double bond conversion and polymerization shrinkage both increased, while the glass transition temperature (Tg) decreased. All EPCDMA/TEGDMA mixtures had slightly higher storage modulus at body temperature (37 degrees C). When compared with Bis-GMA/TEGDMA (70/30), the EPCDMA/TEGDMA (70/30) system assumed similar reactivity and volume shrinkage but higher Tg. SIGNIFICANCE: EPCDMA had comparable mechanical properties to those of Bis-GMA.
Asunto(s)
Resinas Compuestas/química , Compuestos Epoxi/química , Metacrilatos/síntesis química , Bisfenol A Glicidil Metacrilato/química , Bisfenol A Glicidil Metacrilato/efectos de la radiación , Resinas Compuestas/efectos de la radiación , Ciclohexanos/química , Adaptación Marginal Dental , Restauración Dental Permanente , Análisis del Estrés Dental , Compuestos Epoxi/efectos de la radiación , Cinética , Modelos Lineales , Ensayo de Materiales , Metacrilatos/efectos de la radiación , Transición de Fase , Polietilenglicoles/química , Polietilenglicoles/efectos de la radiación , Ácidos Polimetacrílicos/química , Ácidos Polimetacrílicos/efectos de la radiación , Espectroscopía Infrarroja por Transformada de FourierRESUMEN
A series of 1-aminopropan-2-ols were synthesized and evaluated against two strains of malaria, Plasmodium falciparum FCR3 (chloroquine-resistant) and 3D7 (chloroquine-sensitive). Microwave-assisted ring opening of epoxides (aryl and alkyl glycidyl ethers, glycidol, epichlorohydrin) with various amines without catalysts generated the desired library of beta-amino alcohols rapidly and efficiently. Most of the compounds showed micromolar potency against malaria, with seven of them having IC50 values between 1 and 10 microM against both Plasmodium falciparum strains.
Asunto(s)
Antimaláricos/síntesis química , Compuestos Epoxi/efectos de la radiación , Microondas , Plasmodium falciparum/efectos de los fármacos , Propanolaminas/síntesis química , Animales , Antimaláricos/química , Antimaláricos/farmacología , Línea Celular Tumoral , Células Cultivadas , Cloroquina/farmacología , Resistencia a Medicamentos , Compuestos Epoxi/química , Eritrocitos/efectos de los fármacos , Eritrocitos/parasitología , Humanos , Concentración 50 Inhibidora , Propanolaminas/química , Propanolaminas/farmacología , Relación Estructura-ActividadRESUMEN
An ultrasound assisted phase-transfer catalyzed epoxidation of 1,7-octadiene is greatly enhanced by using a cocatalyst of phosphotungstic acid in the presence of hydrogen peroxide in an organic solvent/aqueous solution two-phase medium. An active intermediate of the catalyst (Q3PW12(O)nO40, where Q = R4N+) produced from the reaction of phosphotungstic acid, hydrogen peroxide, and Aliquat 336. A rational mechanism of epoxidation is proposed to account for the reaction from the experimental evidence. The organic-phase reactions, including two series reactions, are the rate-controlling steps to produce two products, viz., 1,2-epoxy-7-octene and 1,2,7,8-diepoxyoctane. The kinetics of epoxidation, including the characteristics of the catalyst and the effect of the amount of cocatalyst, agitation speed, quaternary ammonium salts, amount of Aliquat 336, amount of hydrogen peroxide, amount of chloroform, pH value, organic solvents, and temperature on the conversion of 1,7-octadiene were investigated in detail. A kinetic model was built, from which a pseudo-first-order rate law is sufficient to describe the behavior of the reaction.
Asunto(s)
Compuestos Epoxi/química , Compuestos Epoxi/efectos de la radiación , Sonicación , Terpenos/química , Terpenos/efectos de la radiación , Catálisis , CinéticaRESUMEN
This paper describes fabrication of a poly(dimethyl siloxane) (PDMS)-based chip to analyze multiple protein interactions utilizing glycidyl methacrylate (GMA) photopolymer for a site-specific immobilization of capture proteins in a closed system. First, using one direction channels of a PDMS mold having cross-channels, GMA micropads were prepared by photopolymerizing GMA solution by 365 nm light irradiation at predetermined positions. After the first mold was replaced with a second mold having higher height or directly without mold changing, capture proteins were allowed to be covalently immobilized onto the surface of the epoxide-activated GMA pads. Following immobilization, poly(ethylene glycol) diacrylate (PEG-DA) precursor was photopolymerized at specific regions to generate plugs for prevention of mixing between different sample injection channels, diminishing the need of a mold changing for sample injections. Final chip was assembled by connecting separated sample injection channels using a connector mold. The viability of this strategy was successfully demonstrated by simultaneous detection of two different antigen-antibody interactions.
Asunto(s)
Técnicas Biosensibles/instrumentación , Dimetilpolisiloxanos/química , Compuestos Epoxi/química , Inmunoensayo/instrumentación , Metacrilatos/química , Técnicas Analíticas Microfluídicas/instrumentación , Análisis por Matrices de Proteínas/instrumentación , Siliconas/química , Espectrometría de Fluorescencia/instrumentación , Materiales Biocompatibles/química , Técnicas Biosensibles/métodos , Mezclas Complejas/análisis , Compuestos Epoxi/efectos de la radiación , Diseño de Equipo , Análisis de Falla de Equipo , Inmunoensayo/métodos , Luz , Metacrilatos/efectos de la radiación , Técnicas Analíticas Microfluídicas/métodos , Fotoquímica/métodos , Análisis por Matrices de Proteínas/métodos , Unión Proteica , Espectrometría de Fluorescencia/métodos , Propiedades de SuperficieRESUMEN
Photocatalytic oxidation of propylene with molecular oxygen at room temperature was investigated over various silica-supported metal oxides with low loading. The photocatalytic active site is assumed to be the isolated tetrahedrally coordinated metal oxides in the ligand-to-metal charge-transferred state, such as (Mdelta- -OLdelta+). Photocatalytic epoxidation of propylene into propylene oxide was promoted over silica-supported V and Ti oxides at steady state. Over silica-supported Cr oxide, the propylene oxide formation rate was remarkably decreased with the time course in the reaction. The oxidation state and the coordination environment of the supported Ti, V, and Cr oxide species were determined by diffuse reflectance UV-vis spectroscopy (DRS) and electron spin resonance (ESR). During the photocatalytic oxidation, the oxidation state of the Ti4+ species was not varied. On the other hand, the V5+ species was partially reduced to V4+ and the Cr6+ species was successively reduced to Cr5+ and Cr3+. An isotopic tracer study of the C3H6-18O2 reaction suggests the difference of the active oxygen species between TiO2/SiO2 and V2O5/SiO2. The active oxygen species on TiO2/SiO2 is derived from molecular oxygen. On the other hand, the photogenerated products on V2O5/SiO2 incorporate the lattice oxygen of the surface metal oxide species. It is suggested that the kinds of terminal ligand (hydroxyl or oxo) of the tetrahedrally coordinated metal oxides on silica decide the active oxygen species in the photocatalytic oxidation. A photoinduced hole center on the monohydroxyl (SiO)3Ti-OH species activates molecular oxygen that reacts with propylene. In the case of the monooxo (SiO)3V=O and dioxo (SiO)2Cr=O2 species, the photoactivated lattice oxygen (OL-) directly reacts with propylene.