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Sampling and Collection of Particulate Matter For Analysis
Published in Thomas A. Barber, Control of Particulate Matter Contamination in Healthcare Manufacturing, 1999
A tape sample may be attached to a clean microscope slide while it is being transported to the laboratory for study. For quick examination, a tape sample may be placed adhesive side down on a microscope slide and observed directly, or a small drop of a refractive index liquid may be placed between the slide and tape in the area to be examined. As with particles collected on filters, particulate matter may be removed from the tape with a solvent. To accomplish this, the adhesive surface of the tape is exposed, and the tape sample is placed in a centrifuge tube with xylene or other appropriate solvent. When the adhesive has dissolved from the tape and has freed the particles, the backing is removed from the tube, and the particles are collected by centrifugation. The supernatant liquid is then pipetted or decanted off and the particles are washed in solvent before drying and mounting. Collections of settled particles in the field are often made by allowing dust to settle onto a thin Aroclor® film on a microscope slide. Particles adhere to the film and cannot be blown away.
Production Methods
Published in H. Angus Macleod, Thin-Film Optical Filters, 2017
A good account of various cleaning methods is given by Holland [59]. A more recent account is that of Mattox [60]. The best cleaning process will depend very much on the nature of the contamination that must be removed, and although it may seem self-evident, in all cleaning operations, it is essential to avoid contaminating the surface rather than cleaning it. For laboratory work, when the substrates are reasonably clean to start with (microscope slide glass is usually in this condition), then for most purposes, it will be found sufficient to thoroughly wash the substrates in detergent and warm water (not household detergent that sometimes has additives that cause smears to appear on the finished films), to thoroughly rinse them in running warm water (in areas where tap water is fairly pure, hot tap water will often be found adequate), and then to thoroughly and immediately dry them with a clean towel or soft paper tissue or, better still, to blow them dry with a jet of clean dry nitrogen. The substrates should never be allowed to dry themselves or stains will certainly occur, which are usually impossible to remove. Substrates should be handled as little as possible after cleaning and, since they never remain clean for long, immediately placed in the coating machine, and the coating operation, started. Wax or grease will probably require treatment with an alcohol such as isopropyl, perhaps rubbing the surface with a clean fresh cotton swab soaked in the alcohol and then flooding the surface with the liquid. Care must be taken to ensure that the alcohol is clean. A bottle of alcohol available to all in a laboratory seldom remains clean for long, and a better arrangement is to keep it under lock and key and to allow the alcohol into the laboratory in wash bottles that emit the alcohol when squeezed.
Multi-height phase recovery combined with Fast Iterative Shrinkage-Thresholding Algorithm to handle phase microspheres from complex diffracted field in inline holography
Published in Journal of Modern Optics, 2019
Yao Koffi, Jocelyne M. Bosson, Marius Ipo Gnetto, Edoe F. Mensah, Jeremie T. Zoueu
In this experiment, two solutions of phase microspheres were prepared. One consists of 10.2 µm organic polymer’s microspheres (particularly polystyrene microbeads with refractive index n = 1.586 at wavelength λ = 650 nm (55) at the temperature T = 20 °C) and the other consists of 1 µm polystyrene microbeads. A small drop of the diluted solution was placed and spread on glass slide that is very clean and resistant to corrosion. The glass slide is based on a standard 76 mm × 26 mm × 1 mm microscope slide. The sample dries for 30 min. After, it used for microscopic examination. A light source with wavelength 650 nm is employed to illuminate the sample. Different acquisitions of the diffracted wave through sample are made with a CMOS camera (THORLABS DCC1545M) by introducing a reference beam. The sample holder is shifted in the direction away from the detector by 500 µm increments 2 times, resulting in three different relative positions of approximatively 0, 500 and 1000 µm. As we move the sample, a different region of object field is transmitted. The recorded images progressively change. This difficulty is surmounted by the reconstruction method described on the top.
Effect of TritonX-100 on the aggregation behavior of SDS in water
Published in Phase Transitions, 2018
Liquid crystals were checked by POM (Axio Scope.A1, Ceiss, Germany) at room temperature. The H and L phases are anisotropic and can be identified by comparison of the textures with photomicrographs in the literature, whereas the cubic phase is isotropic and, therefore, does not give texture. We transferred the sample to a microscope slide, which we immediately covered with a cover glass to avoid water evaporation. The sample slide was placed under the stage. Magnification of 200× was used, and photomicrographs of various phases were obtained with a digital camera. Surface tension measurements were conducted on a model JYW-200B (Shanghai Jiang Yi instrument Co., Ltd., China) surface tensiometer using the ring method. Temperature was controlled by using a super-constant-water bath. The surface tension was determined in a single-measurement method. All measurements were repeated at least twice until values were reproducible.