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To activate the surface of cotton fabrics before chemical nickel plating, it is proposed to use physical and chemical processes occurring in thin layers of solutions of copper (II) chloride under the influence of electromagnetic solar rays of the visible spectrum. It is shown that cellulose, which is the main component of the fabric, undergoes phot...
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Context 1
... determine this value, the SM206-SOLAR solar radiation meter was used. Studies of the process were carried out in a laboratory room, where the temperature was maintained at 25-30 o C. The permeability during the passage of electromagnetic solar rays of some objects related to this work is shown in Table 1. Black plastic film 2 0 0 Designation: W-density of solar radiation energy flow after passing through the specified material, W/m 2 ; n -degree of permeability when the energy flow passes through the material,%. ...Context 2
... slightly moistened fabric contained only copper chloride (1). In some experiments, part of the fabric surface was shielded with a black polymer washer with a thickness of 2 mm, which prevents the sun's rays from penetrating the fabric (Table 1). ...Context 3
... photochemical character of the processes is confirmed by experiments with shielding a part of the surface with black polymer washers (2 mm thick) that are impermeable to the sun's rays (Table 1). The shielded areas do not produce copper monochloride by reaction 1, and CuCl2 can be washed with water (Figure 2). ...Context 4
... allows selective metallization of fabric materials. The presence of permeability of electromagnetic rays through the fabric (Table 1) ensures the flow of photochemical reactions on the reverse side of the fabric. In this case, the degree of blackening of the back side is always lower than the front side (Figure 2, b). ...Similar publications
To activate the surface of cotton fabrics before chemical nickel plating, it is proposed to use physical and chemical processes occurring in thin layers of solutions of copper (II) chloride under the influence of electromagnetic solar rays of the visible spectrum. It is shown that cellulose, which is the main component of the fabric, undergoes phot...
Citations
... Figure 1 shows fabric samples before (a) and after (b) the application of a photochemical copper film. Measurement of the degree of blackening by the above method showed that for the original fabric, this value was 22%, and after applying the film, this value was 75% (degree of blackening of the film, Figure 1b After the formation of a semiconductor layer under the action of solar photons, photons give additional energy, and excited electrons acquire the ability to oxidize, which is necessary to reduce monovalent copper (2) [25]. ...
... After the formation of a semiconductor layer under the action of solar photons, photons give additional energy, and excited electrons acquire the ability to oxidize, which is necessary to reduce monovalent copper (2) [25]. ...
This paper presents a technology for applying copper and silver films to cotton fabrics by combining photochemical and chemical methods for the reduction of the compounds of these metals. The resulting metal-containing films have inherent electrical conductivity of metals. All the main processes described in the work were carried out by means of the compounds being sorbed by the surface of the fabric when they were wetted in appropriate solutions. The aim of the work was to study the application of electrically conductive composite copper films on cotton fabrics. The tasks to achieve this aim were to perform scanning electron microscopy, energy dispersive spectroscopy and X-ray diffraction analysis to confirm that as a result of the experiment, CuCl with a semiconductor ability was formed on the surface of the sample. The driving force behind the photochemical reduction of copper and silver halides on cotton surfaces is that, as a result of the photooxidation of cellulose molecules in the fabric, copper monochloride is first formed on the cotton surface. Subsequently, the process of obtaining silver particles based on semiconductor silver chloride obtained as a result of the transformation of copper monochloride was carried out. The physicochemical and photochemical processes leading to the formation of monovalent copper chloride, which provides sufficient adhesion to the substrate, are considered. It is shown that in this case, the oxidation of monovalent copper also occurs with the formation of soluble salts that are easily removed by washing. Since the proposed technology does not require special equipment, and the chemical reagents used are not scarce, it can be used to apply bactericidal silver films to various household items and medical applications in ordinary laundries or at home. This article examines an affordable and simple technology for producing metal films on a cotton surface due to the presence of disadvantages (time duration, high temperature, scarce reagents, special installations, etc.) of a number of well-known methods in the production of chemical coatings.
