Adulterant Detection in Peppermint Oil by Means of Holographic Photopolymers Based on Composite Materials with Liquid Crystal

Diffraction gratings are recorded in a holographic photopolymer containing nematic liquid crystal and peppermint oil. The presence of the oil modifies the polymerization and the holographic response. The composite containing oil adulterated with triethyl citrate obtains a diffraction efficiency related to the oil’s purity. The results obtained suggest the possibility of developing a holographic chemical analysis method for quality control of raw materials.Ministerio de Ciencia e Innovación (Spain) under projects; PID2019-106601RB-I00 FIS2017-82919-R; Generalitat Valenciana (Spain) under projects: IDIFEDER/2021/014; (cofunded by European Union through the FEDER Programme) PROMETEO 2021/006

Design and development of an innovative and simple optical sensor for the detection of acetic acid

The technology we are developing consists of the use of coordination compounds with metals to carry out this detection of Acetic acid. This compound normally reacts with acetic acid changing its colour, making it a suitable compound for use as a detector. The proposed method allows detecting acetic acid in any medium, whether in solution, in the gas phase, in the solid phase, or in any combination of these. Upon contact with the acid, a colour change occurs that can be detected visually or through optical means. After its use, the active medium can be regenerated by a simple procedure and be available again for new use. This allows the creation of simple and intuitive detection devices, usable by non-experts and that can be regenerated and reused. The main advantage of this sensor is to allow the specific detection of acetic acid and quantification of its concentration, using coordination compounds with metals that are present in the yellow dye.This work was supported by Ministerio de Ciencia e Innovación (Spain) under project PID2019-106601RB I00,and Generalitat Valenciana (Spain) under projects IDIFEDER/2021/014 (cofunded by European Union through the FEDER Programme), PROMETEO2021/006

Design and development of a simple and innovative Optical detection sensor for acetic acid

The technology we are developing consists of the use of coordination compounds with metals to carry out the detection of acetic acid, which is a harmful substance for human health and some art works.This work was supported by Ministerio de Ciencia e Innovación (Spain) under project PID2019-106601RB-I00, and Generalitat Valenciana (Spain) under projects IDIFEDER/2021/014 (cofunded by European Union through the FEDER Programme), PROMETEO 2021/006

Adulterant Detection in Peppermint Oil by Means of Holographic Photopolymers Based on Composite Materials with Liquid Crystal

Diffraction gratings are recorded in a holographic photopolymer containing nematic liquid crystal and peppermint oil. The presence of the oil modifies the polymerization and the holographic response. The composite containing oil adulterated with triethyl citrate obtains a diffraction efficiency related to the oil’s purity. The results obtained suggest the possibility of developing a holographic chemical analysis method for quality control of raw materials

Influence of the introduction of peppermint oil as additive in the composition of HPDLC photopolymer and holographic response obtained

Holography is an optical technique that allows the recording and the reconstruction of the wave front of an object; and it permits us to obtain the three dimensional images of a material. The use of photopolymers is justified by their properties such as the higher diffraction efficiency with an acceptable energetic sensitivity, and other special characteristic, which are added just by adding liquid crystal, like the capacity of variation of the electro optical properties by means of an electric field. In this article, attempt has been made to see the influence of the introduction of peppermint oil as additive in the composition of HPDLC to see the different holographic responses. Volume diffraction gratings are recorded in two samples of HPDLC with and without peppermint oil respectively using a Nd:YAG laser tuned at 532 nm. Peppermint oil is used in this study since it.s a naturel oil with specified properties that are compatible with the HPDLC photopolymer. The proprieties related to viscosity, density color and solubility are similar to those of the stander components of the photopolymer Since it is very important to develop material with ecofriendly properties, the use of natural components in these materials can improve properties related to environment as peppermint oil has the similar properties as the other components, and also It can be a good concurrent to replace some of the components to have a more ecofriendly photopolymer Peppermint oil is soluble in the photopolymer. When the oil is added to the composition, the diffraction efficiency is decreased. This could be related to the polymerization or the PIPS process.Este trabajo ha sido financiado por el Ministerio de Ciencia e Innovación con los proyectos FIS2017-82919-R (MINECO/AEI/FEDER, UE) y PID2019-106601RB-I00, y la Generalitat Valenciana con el proyecto CDEIGENT/2018/024

Adulterant detection in peppermint oil by means of holographic photopolymers based on composite materials with liquid crystal

In this work, we use a holographic dispersed liquid crystal (HPDLC) to detect a substance added as adulterant to peppermint oil. Volume diffraction gratings are recorded in two samples of HPDLC with and without peppermint oil respectively using a Nd:YAG laser tuned at 532 nm. The adulterant is detected due to the differences obtained for the maximum diffraction efficiency, which are related to the purity of the oil.This research was funded by the Generalitat Valenciana, Spain (PROMETEO/2021/006 and IDIFEDER/2021/014, cofunded by European Union through the FEDER programme); Ministerio de Ciencia e Innovación, Spain (PID2019-106601RB-I00 and PID2021-123124OB-I00)

Thermal effects during the recording of holographic diffraction gratings in HPDLC

In this work, we discuss the influence of the temperature on the recording of a hologram in HPDLC samples. We use a standard holographic setup with two symmetric beams from 532 nm solid-state laser, and one beam for the reconstruction of the hologram from a He-Ne laser. During the experimental work, we noticed that some samples still colorless to the naked eye before and after laser exposure (sample 1).whereas other samples become opaque (white color) during laser exposure (sample 2).Ministerio de Ciencia e Innovación (Spain) under project PID2019-106601RB-I00, Generalitat Valenciana (Spain) under project IDIFEDER/2021/014 (potencial FEDER funding