Crimson Publishers-Material Science

  Abstract One of the 12 principles of Green Chemistry is the use of catalysts in preference to stoichiometric reagents to enhance the atom economy and yield of chemical reactions. Oxidation of alcohols to the corresponding carbonyl compounds is an industrially important reaction as it yields useful by products. Environmentally hazardous metal ions like Cr(VI), Os(VIII) and Ru in different oxidation states have been routinely used to catalyse the oxidation of alcohols. As a green initiative, we have used the relatively inexpensive and less harmful transition metal ions to catalyse the oxidation of alcohols used in the manufacture of perfumes and fragrances. This paper reports the kinetic study of the oxidation of the unsaturated primary perfumery alcohol, Cinnamyl alcohol by Ce(IV) in acidic medium. The oxidation was carried out under first order kinetic conditions with respect to Ce(IV) at different temperatures. From the variation of oxidation rate with temperature, the thermodyn...

  Introduction Additive manufacturing has changed the whole layout of the manufacturing industry with its layer-by-layer approach. With the help of this technique, the fabrication of complex and intricate parts in the different industries was possible in less time and reduced portfolio costs. A lot of research is going on in the scientific community for the fabrication of metal parts using additive manufacturing. Metal Additive Manufacturing (MAM) techniques are coming up with a method to fabricate complex intricate and large-scale metal structures. Many countries like India are focused on developing this technology. It is believed by many experts that the proper development of AM infrastructure in India is very fruitful for the nation’s economic and technological growth. In 2020, the Prime Minister of India, Shri Narendra Modi, launched “Atmanirbhar Bharat,” for the country to become self-reliant. Various measures have been proposed in this area to increase efficiency, competitive...

  Abstract The use of very fine cement grouts for injection into fine-to-medium sands has been proposed to circumvent problems associated with the permanence and toxicity of chemical grouts and the inability of ordinary cement grouts to permeate soil formations finer than coarse sand. Τhe rheological properties of a cement suspension grout significantly determine the success of an injection especially in those cases where geometric constraints do not arise from the size relationship between soil voids and suspension solids. For this reason, it is considered necessary to determine the rheological characteristics of the suspensions during the design phase of an injection program, so as to select the optimal suspensions on a case-by-case basis. In general, determining the rheological behavior of a cement suspension is not an easy task as there are many factors that intervene in it and have opposite effects. In this paper information is given regarding the effect of these factors on th...

Short Communication Metal oxides were widely used in the domains of materials, physics, and chemistry and have been extensively used in catalysts, fuel cells, piezoelectric materials, sensor materials, and optical components. Among various metal oxides, CeO2 is one of the extensively applied and discussed. It has a face-centered cubic structure with a high melting point (2400-2700 ℃) and possesses remarkable properties such as the number of effective redox Ce3+/Ce4+ sites and their ability to exchange oxygen [1]. Therefore, it has good optical properties, thermal stability and electrical conductivity, and oxygen storage function [2,3]. For instance, the optical property of UV-vis spectroscopy for the CeO2 nanoparticles exhibits a blue shift with respect to the bulk material due to quantum confinement, which have two limiting case, depending on the ratio of the crystallite radius to the effective Bohr radius of the electron-hole pair [4]. Therefore, the crystal size and energy gap measu...