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SM ISO690:2012 KUZNETSOVA, Tatyana F., IVANETS, Andrei, OPANASENKO, Olga, ZHIGALOVA, Olga, LUKSHA, Olga, SAUKA, Justyna. Direct synthesis of multidimensional porous silica using a mixture of supramolecular templates. In: Achievements and perspectives of modern chemistry, 9-11 octombrie 2019, Chişinău. Chisinau, Republic of Moldova: Tipografia Academiei de Ştiinţe a Moldovei, 2019, p. 119. ISBN 978-9975-62-428-2. |
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Achievements and perspectives of modern chemistry 2019 | ||||||
Conferința "International Conference "Achievements and perspectives of modern chemistry"" Chişinău, Moldova, 9-11 octombrie 2019 | ||||||
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Pag. 119-119 | ||||||
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The synthesis of multidimensional porous materials with a tailored polymodal distribution of pores combining micro- and mesopores is especially important for those chemical processes where the heterogeneous system operates at low reaction temperatures or the moderate temperatures of its regeneration are necessary [1,2]. The aim of this work is to study the spatial correspondence of structural varieties of organic template to pores and voids formed in multidimensional porous silica. The template in the work was a supramolecular mixture of nonionic and cationic surfactants, namelyTween-80 and Stabiram. figureFigure 1. NLDFT size distribution of pores calculated from isotherms of low-temperature nitrogen adsorption-desorption on SiO2 samples obtained at a molar ratio of Tween-80 / Stabiram: 1 – 0; 3 – 0.5/0.5; 4 – 0.8/0.2; 5 – *.Isothermal data of superficial tension of solutions of surfactant mixture and lowtemperature nitrogen sorption of multidimensional porous silica received by template synthesis prove complementarity of its properties and properties of SAA micelles. The measured isotherms of gas sorption belong to IV Type, inherent in mesoporous adsorbents. The BET specific surface area is 600-800 m2/g, and the Gurvich pore volume is 0.7-1.0 cm3/g. With increase in mol fraction of nonionic component these values decrease, the ordered texture of SiO2, characteristic of MCM-48 mesoporous molecular sieve, collapses, d211-spacing becomes < 3.31 nm, and NLDFT distribution is transformed from monomodal to polymodal one (Figure 1). |
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