National Repository of Grey Literature 49 records found  beginprevious40 - 49  jump to record: Search took 0.01 seconds. 
Supercritical Fluid Extraction and Characterisation of Urtica Dioica L. Leaves Pigments
Sajfrtová, Marie ; Sovová, Helena ; Bártlová, Milena ; Opletal, L.
Extraction and fractionation of green and yellow pigments from stinging nettle leaves was studied using ethanol-modified carbon dioxide as a solvent. The extracts were analysed by means of HPLC and RP-HPLC systems. The effect of operation conditions was analysed in a series of experiments at pressures from 20 MPa to 28 MPa, temperatures between 25 °C and 60 °C, and ethanol concentration in CO2 between 0 and 7.4 wt.%. The main result was that the best conditions for the supercritical fluid extraction of pigments were ethanol concentration in CO2 4.5 - 7.4 wt.%, temperature 40°C and pressure 28MPa and that degradation of pigments was eliminated with decrease of temperature of micrometer valve and addition of small amount of antioxidant to ethanol.
Application of mica based pigments
Štengl, Václav ; Kalendová, A. ; Trojan, M.
Properties of sandwich pigments based on mica coated with metal oxide layers are described. Various mica types were characterized and used for pilot plant scale synthesis of pigments. Paints containing this kind of pigments were formulated and tested anticorrosive coatings. Synthesis and characterization of some thermally stable pigments based on mixed metal oxides is also described.
Barrier Type Pigments for Corrosion Protection
Štengl, Václav ; Bakardjieva, Snejana ; Šubrt, Jan ; Kváča, Zdeněk
Alignment natural pigments specularite (.alpha. - Fe2O3 - "ferric mica") with the pigments based on modify mica. Mica flakes (muscovite) of particles size 20-80 nm were covered with layers Fe2O3 about thickness 1 nm by homogenous precipitation of fe
Materials research report - Dying Hyrnéthó in the arms of Déiphotos. (oil on canvas), Franz Caucig 1755-1828. Castle Velké Losiny
Hradilová, J. ; Hradil, David ; Šímová, Veronika
Pre-restoration materials research of the painting is based on microscopic (both optical and electron) analyses of grounds and painting layers in the cross-sections of fragments with the aim to identify pigments and to describe the stratigraphy of re-paints involving to choose the suitable restoration procedure. Other methods (e.g. infrared spectroscopy or MALDI-TOF) are used for identification of binding media.
Materials research report - Themistokles looks for a haven besides the king Admétus (oil on canvas), Franz Caucig 1755-1828. Castle Velké Losiny
Hradilová, J. ; Hradil, David ; Šímová, Veronika
Pre-restoration materials research of the painting is based on microscopic (both optical and electron) analyses of grounds and painting layers in the cross-sections of fragments with the aim to identify pigments and to describe the stratigraphy of re-paints involving to choose the suitable restoration procedure. Other methods (e.g. infrared spectroscopy or MALDI-TOF) are used for identification of binding media.
Materials research report - Tomyris (oil on canvas), Ministry of Culture in Prague
Hradilová, J. ; Hradil, David ; Šímová, Veronika ; Bezdička, Petr ; Kučková, Štěpánka
Pre-restoration materials research of the painting is based on microscopic (both optical and electron) analyses of grounds and painting layers in the cross-sections of fragments with the aim to identify pigments and to describe the stratigraphy of re-paints involving to choose the suitable restoration procedure. Other methods (e.g. infrared spectroscopy or MALDI-TOF) are used for identification of binding media.
Materials research report - Funerál Insignias from tombs in the Prague Castle. (polychromy on wood), Prague Castle - Office of the President of the Czech Republic
Hradilová, J. ; Hradil, David ; Šímová, Veronika ; Bezdička, Petr ; Kučková, Štěpánka
Pre-restoration materials research of the painting is based on microscopic (both optical and electron) analyses of grounds and painting layers in the cross-sections of fragments with the aim to identify pigments and to describe the stratigraphy of re-paints involving to choose the suitable restoration procedure. Other methods (e.g. infrared spectroscopy or MALDI-TOF) are used for identification of binding media.
Materials research report - Arcades of Charles IV. - wall painting with heralds (15-16th Century) - Old Royal Palace - Prague Castle
Hradilová, J. ; Hradil, David ; Šímová, Veronika ; Kučková, Štěpánka
Pre-restoration materials research of the painting is based on microscopic (both optical and electron) analyses of grounds and painting layers in the cross-sections of fragments with the aim to identify pigments and to describe the stratigraphy of re-paints involving to choose the suitable restoration procedure. Other methods (e.g. infrared spectroscopy or MALDI-TOF) are used for identification of binding media.

National Repository of Grey Literature : 49 records found   beginprevious40 - 49  jump to record:
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