Search results for "Dye"
showing 10 items of 577 documents
The use of botanical raw materials in hair dyeing
2021
Rynek kosmetyczny bogaty jest w produkty umożliwiające zmianę koloru włosów. Dostępne są trzy możliwości koloryzacji chemicznej zależne od czasu utrzymywania się docelowego koloru. Wśród nich wyróżnia się farbowanie krótkotrwałe, półtrwałe oraz długotrwałe. Przy użyciu składników syntetycznych możliwe jest uzyskanie pełnego przekroju kolorystycznego. Doniesienia o niepożądanych skutkach ubocznych farb chemicznych, zarówno dotyczących skóry głowy jak i struktury włosów przemawiają za powrotem naturalnych sposobów koloryzacji włosów, i za rozwojem tego kierunku. Celem opracowania było przybliżenie możliwości zastosowania surowców roślinnych celem koloryzacji włosów. Scharakteryzowano następuj…
Anomalous electrical parameters improvement in Ruthenium DSSC
2018
. In this work, we present a series of measurements carried out on Ruthenium-based Dye Sensitized Solar Cells (DSSCs) after the application of different external electrical field values. Such measurements have been performed both in the dark and by illuminating the sample with sunlight emitted by a solar simulator (AM1.5G spectrum with a power irradiance of 1000 W/m2). Our results demonstrate that the initial electrical bias field modifies in both cases the behavior of the cell in terms of an anomalous improvement of the main electrical parameters.
Anomalous performance enhancement effects in Ruthenium-based Dye Sensitized Solar Cells
2017
Dye Sensitized Solar Cells (DSSCs) are nowadays more and more employed since they present lower production costs than traditional silicon photovoltaic devices. An interesting phenomenon affecting such devices consists in the fact that current density-voltage (J-V) characteristic can depend on the history of the cell prior to the measurement, which often can be assimilated to an anomalous hysteresis effect. In this work, we study such phenomenon on Ruthenium-based DSSCs through a series of measurements performed after applying different values of external electrical field to the cell. The measurements have been carried out both under simulated sunlight (AM1.5G - 1000 W/m2) and in the dark. W…
A new simple chromo-fluorogenic probe for NO2 detection in air.
2015
[EN] A new chromo-fluorogenic probe, consisting of a biphenyl derivative containing both a silylbenzyl ether and a N,N-dimethylamino group, for NO2 detection in the gas phase has been developed. A clear colour change from colourless to yellow together with an emission quenching was observed when the probe reacted with NO2. A limit of detection to the naked eye of about 0.1 ppm was determined and the system was successfully applied to the detection of NO2 in realistic atmospheric conditions.
Facile Synthesis of Fluorescent Polymer Nanoparticles by Covalent Modification-Nanoprecipitation of Amine-Reactive Ester Polymers
2015
Emission wavelength control in fluorescent nanoparticles (NPs) is crucial for their applications. In the case of inorganic quantum dots or dye-impregnated silica NPs, such a control is readily achieved by changing the size of the particles or choosing appropriate fluorescent dyes, respectively. A similar modular approach for controlling the emission wavelength of fluo-rescent polymer NPs, however, is difficult. This article reports on fluorescent polymer NPs, the synthesis of which provides a platform for a modular approach towards the preparation of fluorescent NPs of desired emission wavelength. Atom-transfer radical polymerization (ATRP) is employed to synthesize reactive ester polymers,…
Optimizing the SYBR green related cyanine dye structure to aim for brighter nucleic acid visualization
2022
In recent years, the studies of RNA and its use for the development of RNA based vaccines have increased drastically. Although cyanine dyes are commonly used probes for studying nucleic acids, in a wide range of applications, there is still a growing need for better and brighter dyes. To meet this demand, we have systematically studied the structure of SYBR green-related cyanine dyes to gain a deeper understanding of their interactions with biomolecules especially how they interact with nucleic acids and the structural components which makes them strongly fluorescent. Herein, five new dyes were synthesized, and their photophysical properties were evaluated. Observations of photophysical cha…
Experimental Investigation on the Performances of Innovative PV Vertical Structures
2019
The sustainable development of our planet is considerably related to a relevant reduction of CO2 global emissions, with building consumption contributing more than 40%. In this scenario, new technological conceptions, such as building-integrated photovoltaic technology, emerged in order to satisfy the requirements of sustainability imposed by the European Union. Therefore, the aim of this work is to provide a technical and economical comparison of the performances of different vertical-mounted innovative photovoltaic systems, potentially integrated on a building instead of on traditional windows or glass walls. The proposed investigation was carried out by means of experimental tests on thr…
The assessment of the reliability of an innovative 3rd generation solar cell integrated with “thermal belt” glass block
2017
Glass block is a building product widely used for the construction of translucent building façades and roofs. The need to adapt the product to the regulations in the field of energy saving and environmental sustainability has led to the design of innovative configurations, through the integration of different sub-components. These ones are able to improve its energy performance by means of the integration of a“thermal belt”, cold glued to the glass shells, which constitute the traditional glass block, and 3rd generation solar cells. This paper reports the first results of the experimental program designed to assess some durability components: inherent and critical reliability. <div id="g…
Hair Dyes in Cosmetics. Regulatory Aspects and Analytical Methods
2007
Abstract Fragrance ingredients are extensively used in perfumes and other cosmetics, providing us with a pleasant scent. However, different fragrance chemicals and other chemicals present in perfume composition have been shown to cause undesirable side effects. The EC Regulation prohibits and limits the contents of some of them in cosmetics. Other international organizations, such as the International Fragrance Association and the Research Institute for Fragrance Materials, work on the safety of fragrance chemicals and release reports on the convenience or not of using certain fragrance chemicals in cosmetics, depending on their toxicity. This chapter is focussed on the determination of fra…
The Relevance of Flow Cytometry for Biochemical Analysis
2001
Flow cytometry (FCM) allows the simultaneous measurement of multiple fluorescences and light scatter induced by illumination of single cells or microscopic particles in suspension, as they flow rapidly through a sensing area. In some systems, individual cells or particles may be sorted according to the properties exhibited. By using appropriate fluorescent markers, FCM is unique in that multiple structural and functional parameters can be quantified simultaneously on a single-particle basis, whereas up to thousands of biological particles per second may be examined. FCM is increasingly used for basic, clinical, biotechnological, and environmental studies of biochemical relevance. In this cr…