Ultra High Resolution Replica

Adachi, Kôichi; Katoh, Masaru; Baba, Norio; Shino, Masayuki; Adachi, Masayoshi; Kanaya, K.

doi:10.1380/jsssj.1.127

Cited by 2 publications

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“…Titanium oxide IV or titanium dioxide (TiO 2 ) conformed by highly reactive oxygen and titanium, which are is the ninth element and seventh most abundant metal in the earth's crust. It is a material abundant in the nature, thermally stable and relatively cheap [1]. This semiconductor material has become an increasingly important material, which attracts considerable attention in recent decades.…”

Section: Introductionmentioning

confidence: 99%

Structural and optical characterization of the crystalline phase transformation of electrospinning TiO2 nanofibres by high-temperatures annealing

et al. 2019

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The electrospinning technique has been used to synthesize TiO2 nanofibres, which by annealing at high temperatures achieves the crystalline phase transformation of anatase to rutile passing through the anatase-rutile mixed. The investigated temperature range was 0-1000 • C. The TiO 2 nanofibres surface morphology and chemical stoichiometry were obtained by Scanning Electron Microscopy and Energy Dispersive Spectrometry. The annealed nanofibres diameter was ranged from 137.0 to 115.3 nm in the investigated temperature range. The influence of the annealing temperature on the structure and crystalline phase quality of the TiO2 nanofibres has been investigated by X-ray diffraction and Raman scattering. Clear evidence have been obtained of the structural transformation of TiO2 nanofibres from pure anatase to pure rutile, including the almost amorphous and anatase-rutile mixed structural phases by X-ray diffraction and confirmed by Raman scattering. By X-ray diffraction was found that the TiO 2 nanofibres crystalline phases presented as preferential growth direction (101) for anatase and (110) for rutile. The Raman spectroscopy exhibits the anomalous behavior for band broadening and shifting of Raman bands with increasing crystallite size that forms the nanofibres. The room-temperature photoluminescence presents radiative bands whose dominant band redshifts from 2.56 to 1.32 eV, as the crystalline phase is transformed by annealing at high temperature.La técnica de electrohilado se ha utilizada para sintetizar nanofibras de TiO 2 , que al recocerlas a altas temperaturas se logra la transformación de la fase cristalina de anatasa a rutilo pasando a través de la mezcla anatasa-rutilo. El rango de temperatura investigado fue de 0 a 1000 • C. La morfología superficial y la estequiometria química de las nanofibras de TiO 2 se obtuvieron mediante microscopía electrónica de barrido y espectrometría de dispersión de energía. El diámetro de las nanofibras recocidas osciló entre 137.0 a 115.3 nm en el rango de temperatura investigado. La influencia de la temperatura de recocido en la estructura y la calidad de la fase cristalina de las nanofibras de TiO2 ha sido investigada mediante difracción de rayos X y dispersión Raman. Se han obtenido evidencias claras de la transformación estructural de nanofibras de TiO2 desde anatasa pura a rutilo puro, incluidas las fases estructurales casi amorfas y mezcla anatasa-rutilo mediante difracción de rayos X y confirmada por dispersión Raman. Por difracción de rayos X se encontró que las fases cristalinas de las nanofibras de TiO 2 presentaron como dirección de crecimiento preferencial (101) para la anatasa y (110) para el rutilo. La espectroscopia Raman muestra el comportamiento anómalo para el ensanchamiento y desplazamiento de las bandas de Raman a medida que aumenta el tamaño de los cristales que forman las nanofibras. La fotoluminiscencia a temperatura ambiente presenta bandas de radiación cuya cuya banda dominante se desplazada al rojo desde 2.56 a 1.32 eV, a medida que la fase cristalin...

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Section: Introductionmentioning

confidence: 99%

Structural and optical characterization of the crystalline phase transformation of electrospinning TiO2 nanofibres by high-temperatures annealing

et al. 2019

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“…These costs could be markedly reduced by removing water and transporting a highly concentrated latex, followed by addition of the water and restoration of the initial latex solid content before end-use.Latex destabilization/sedimentation can be implemented by several methods such as centrifugation, [4] heating, [5] or changing the state of the continuous phase by boiling/freezing the water. [6] However, the most common approach involves the addition of coagulation agents such as solvents, [7] salts, [8] polyelectrolytes, [9,10] or surfactants with opposite charges. [11,12] Another strategy is to employ amphiphilic copolymer surfactants with tunable interfacial activity responsive to, for example, pH and glucose.…”

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confidence: 99%

Reversible Destabilization of UV‐Responsive Polymer Particles (Latex) using a Photoresponsive Surfactant

Jasinski

Guimarães

David

et al. 2019

Macromol. Rapid Commun.

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Production of aqueous dispersions of polymeric nanoparticles via heterogeneous radical polymerization in emulsion‐type systems is of enormous commercial importance. The ability to reversibly destabilize such a latex is highly desirable, for example, to save transportation costs. Herein, a method for synthesis of photo‐responsive polymer latexes that can be destabilized (leading to sedimentation) by only using UV irradiation (no addition of chemicals or change in the experimental conditions) and subsequently redispersed by stirring under visible light irradiation is described. The destabilization/redispersion mechanism relies on photoinduced trans‐cis isomerization of the cationic diazene surfactant 2‐(4‐(4‐butylphenyl)diazenylphenoxy)ethyltrimethylammonium bromide (C4AzoTAB) used in conjunction with the anionic surfactant sodium dodecyl sulfate. It is demonstrated that reversible destabilization can be achieved very rapidly (90 s residence time) employing continuous flow technology.

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Ultra High Resolution Replica

Cited by 2 publications

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Structural and optical characterization of the crystalline phase transformation of electrospinning TiO2 nanofibres by high-temperatures annealing

Structural and optical characterization of the crystalline phase transformation of electrospinning TiO2 nanofibres by high-temperatures annealing

Reversible Destabilization of UV‐Responsive Polymer Particles (Latex) using a Photoresponsive Surfactant

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