Comparison of surface properties of silica xero- and hydrogels hydrothermally modified using mechanochemical, microwave and classical methods

Skubiszewska–Zięba, J.; Khalameida, S.; Sydorchuk, V.

doi:10.1016/j.colsurfa.2016.05.066

Cited by 24 publications

(14 citation statements)

References 28 publications

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“…4b) increase. It should be noted that similar results were earlier obtained for silica, tin dioxide and zirconium phosphate after their MChT [19][20][21]. It is well known that the specific surface area and pore volume depend on the globules size and their packing density in the skeleton of globular porous solids [29].…”

Section: Porous Structuresupporting

confidence: 78%

“…Additional possibilities for adjusting the parameters of the porous structure are provided by modification in the wet gel stage before drying [11,18]. This was exemplarily confirmed using oxides and phosphates [19][20][21][22]. Moreover, the efficiency of MWT and MChT application for regulation of physical-chemical properties of other semiconductor oxides was demonstrated in the studies [20,[23][24][25][26].…”

Section: Introductionmentioning

confidence: 77%

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Mechanochemical and microwave treatment of precipitated zirconium dioxide and study of its physical–chemical, thermal and photocatalytic properties

Kucio

Sydorchuk²,

Khalameida³

et al. 2020

J Therm Anal Calorim

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The effects of the microwave treatment (MWT) and mechanochemical treatment (MChT) on the structure and physicochemical properties of precipitated zirconium oxide were investigated. The obtained materials were characterized using the N2 adsorption/desorption, thermogravimetry (TG, DTG, DTA), XRD and UV–Vis/DRS methods. Photocatalytic properties of the samples were also studied as regards the rhodamine B (RhB) degradation in the aqueous solution. The results show that the microwave and MChT, differing in mill rotation speed, temperature or treatment media, causes significant changes in the porous structure of the obtained samples. In most samples, the specific surface area increase was observed. The DTA and XRD results showed the formation of crystalline structure during MWT. As follows from the investigations, each way of modification results in the shift of the absorption edge toward higher wavelength values and causes photocatalytic degradation of RhB under UV irradiation and makes the obtained materials effective photocatalysts in the visible region.

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Section: Porous Structuresupporting

confidence: 78%

Section: Introductionmentioning

confidence: 77%

Mechanochemical and microwave treatment of precipitated zirconium dioxide and study of its physical–chemical, thermal and photocatalytic properties

Kucio

Sydorchuk²,

Khalameida³

et al. 2020

J Therm Anal Calorim

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“…The nonporous fumed silica aerosils A-50 and A-380 (specific surface area S BET = 50 and 370 m 2 g −1 , particle sizes: 44 and 6 nm, respectively) and the commercial wide-porous silica gel SiO 2 (S BET = 270 m 2 g −1 ) were used as additives (the second component). The porous silica was preliminarily subjected to milling at 300 rpm in water (SiO 2-MChT ) [8,9].…”

Section: Preparationmentioning

confidence: 99%

“…The introduction of additives into the reaction mixture was made in different ways: in the sol stage at 20 • C in air (samples 1, 2, and 3), the sol-gel transition at 200 • C in the autoclave (HTT, samples 4, 5, 6, and 7), or in the wet gel stage during MChT at 300 rpm (samples 8,9,10) or 500 rpm (sample 11). MChT was performed using the ball mill Pulverisette-7 (Fritsch, Germany).…”

Section: Preparationmentioning

confidence: 99%

“…Many modern research methods are used to assess the characteristics of silica materials. These include, among others, adsorption of different gases and liquids, thermal analysis under dynamic or quasi-isothermal conditions [8][9][10][11][12][13][14][15], FTIR and NMR spectroscopies [8,9,14,[16][17][18], ESR [8], SEM or TEM imaging [8,9], and many other methods.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Multimodal Silicas Using TG/DTG/DTA, Q-TG, and DSC Methods

Charmas

Kucio

Sydorchuk³

et al. 2018

Colloids and Interfaces

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The formation of hierarchical, multimodal porosity materials with controlled shape and size of pores is the essential challenge in materials science. Properties of silica materials depend largely on different features: crystal structure, dispersity, surface composition, and porosity as well as the method of preparation and possible modification. In this paper, multimodal silicas obtained using different additives are presented. A-50 and A-380 aerosils and wide-porous SiO 2 milled at 300 rpm were used as the additives in the sol stage at 20 • C, the sol-gel stage followed by hydrothermal modification (HTT) at 200 • C, or in the mechanochemical treatment (MChT) process. The characterizations were made by application of N 2 adsorption/desorption, SEM imaging, quasi-isothermal thermogravimetry (Q-TG), dynamic thermogravimetry/derivative thermogravimetry/differential thermal analysis (TG/DTG/DTA), and cryoporometry differential scanning calorimetry (DSC) methods. Results showed that such a one-step preparation method is convenient and makes it possible to obtain multimodal silicas of differentiated porous structures and surface chemistry.

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Influence of mechanochemical treatment on thermal and structural properties of silica–collagen and hydroxyapatite–collagen composites

et al. 2019

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The paper presents the results of research on a series of composite materials based on hydroxyapatite, silica gel and collagen as biologically active substances. Their preparation was made using mechanical energy in accordance with the principles of "green chemistry". Mechanochemical treatment was conducted in a planetary mill with different rotations of milling (200 and 400 rpm) and various periods of time (30, 60 and 120 min). Temperature and pressure changes generated during the mechanochemical treatment were recorded. The obtained composites were analyzed using the low-temperature nitrogen adsorption/desorption method and thermal analysis (TG/DTA). Very interesting and promising results were obtained encouraging further research in this area.

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Comparison of surface properties of silica xero- and hydrogels hydrothermally modified using mechanochemical, microwave and classical methods

Cited by 24 publications

References 28 publications

Mechanochemical and microwave treatment of precipitated zirconium dioxide and study of its physical–chemical, thermal and photocatalytic properties

Mechanochemical and microwave treatment of precipitated zirconium dioxide and study of its physical–chemical, thermal and photocatalytic properties

Characterization of Multimodal Silicas Using TG/DTG/DTA, Q-TG, and DSC Methods

Influence of mechanochemical treatment on thermal and structural properties of silica–collagen and hydroxyapatite–collagen composites

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