Mechanochemical modification of silica

Teokcharov, L.; Simeonov, Danail B.; Uzunov, Ivan M.; Klissurski, D.

doi:10.1007/bf00730278

Cited by 11 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Îäíàêî äàaeå ÷åðåç 10 ìèí îáðàáîòêè (âèáðàöèîííàÿ ìåëüíèöà ñ òðåìÿ ñòàëüíûìè êîëüöàìè â êà÷åñòâå ìåëþùèõ òåë) ñòåïåíü àìîðôèçàöèè ìîaeåò äîñòèãàòü 16.9 %, ðàçìåð êðèñòàëëèòîâ 5 íì [181]. Èçìåëü÷åíèå SiO 2 â øàðîâîé ìåëüíèöå â àòìîñôåðå àçîòà [182] Âîçìîaeíîñòü ïðîâåäåíèÿ ìåõàíîõèìè÷åñêîãî ìîäèôèöèðîâàíèÿ SiO 2 ïîêàçàíà â ðàáîòå [189]. Ââåäåíèå àìèíîãðóïï îñóùåñòâëÿëè ïðè îáðàáîòêå ñèëèêàãåëÿ ðàñòâîðîì îðãàíè-÷åñêîãî àìèíîñîåäèíåíèÿ â ïëàíåòàðíîé ìåëüíèöå â ñðåäå òîëóîëà â òå÷åíèå 10180 ìèí.…”

Section: îêñèä êðåìíèÿunclassified

Formation of Inorganic Supports and Components of Catalysts with the Help of Mechanical Activation

2015

KhUR

View full text Add to dashboard Cite

Ìåõàíè÷åñêàÿ îáðàáîòêà òâåðäûõ âåùåñòâ ñ öåëüþ äèñïåðãèðîâàíèÿ îäíà èç âàaeíåéøèõ òåõíîëîãè÷åñêèõ îïåðàöèé. Áëàãîäàðÿ ñîçäàíèþ è èñïîëüçîâàíèþ âûñîêîíàïðÿaeåííîé èçìåëü÷èòåëüíîé òåõíèêè äîñòèãíóòû ñóùåñòâåííûå èçìåíåíèÿ õèìè÷åñêîãî è ôàçîâîãî ñîñòàâîâ, à ñëåäîâàòåëüíî, è ñâîéñòâ îáðàáàòûâàåìûõ âåùåñòâ. Ïîäîáíûå èçìåíåíèÿ, ïðîèñõîäÿùèå â âåùåñòâàõ ïðè èíòåíñèâíûõ ìå-õàíè÷åñêèõ âîçäåéñòâèÿõ, ïîëó÷èëè íàçâàíèå ÓÄÊ 66.097.5/084.2

show abstract

Section: îêñèä êðåìíèÿunclassified

Formation of Inorganic Supports and Components of Catalysts with the Help of Mechanical Activation

2015

KhUR

View full text Add to dashboard Cite

show abstract

“…The nature of the functional groups on the particle surface usually plays a critical role in the surface properties of particles such as hydrophobicity and chemical reactivity. There has been increasing interest in the synthesis and application of oxide materials whose surface is modified by organic, inorganic and metal-complex compounds [1][2][3] . The significant property of these materials is that they combine the physical properties of solids and the chemical behavior of surface compounds.…”

Section: Introductionmentioning

confidence: 99%

“…Many investigations have been reported on surface treatment and characterization of silica powders 1,[5][6][7][8] .…”

Section: Introductionmentioning

confidence: 99%

Mechanical Treatment of Silica Powder

Hien

Shirai

Fuji

2015

J. Jpn. Soc. Powder Powder Metallurgy

View full text Add to dashboard Cite

An amorphous silica powder (A2) was mechanically treated using a planetary type mill. Four different rotation speeds (50, 100, 200, 300 rpm), milling times (15, 30, 60 min) and ball sizes (01, 05, 10 mm) were used. The structure and morphology of the powder did not change by milling. The effect of milling conditions on particle size distribution and specific surface area was investigated. By the milling treatment the original particle size of the powder was not effectively reduced. Rotation speeds of more than 200 rpm and prolonged milling causes the formation of a broad range of particles of larger sizes. The surface activity of raw and treated powders was measured as the amounts of dissolved Si 4+ ion into ammonia solution. The 10 mm ball size was the most effective for 200 and 50 rpm rotation speeds almost independently of the milling time. Comparison of the effect of milling conditions on particle features of this powder with previously investigated powder is also discussed. The findings indicate that from a technical and economical point of view each powder has its own optimum milling condition, which will be sufficient to considerably increase the specific surface activity of the original amorphous powder making it suitable for different applications in non-firing ceramics processing.

show abstract

“…Functionalization of the silica particle surface can be used to enhance and/or control the overall properties of the particles for particular applications. The nature of the functional groups on the particle surface usually plays a critical role in particle surface properties such as hydrophobicity and chemical reactivity . A recent report proposed a route for fabricating different materials without firing and/or debinding, to reduce the cost and energy for postforming processes .…”

Section: Introductionmentioning

confidence: 99%

“…In this method, the surface of a raw powder is mechanically and/or chemically activated using a planetary ball mill and/or hydrothermal treatment. The mechanical treatment of silica produces various active sites such as ≡Si·, –SiO·, and –Si: radicals . Deposition of different compounds on the surface of SiO‐based materials is usually achieved by adsorption; the adsorption efficiency increases in proportion to the quantity of surface active sites.…”

Section: Introductionmentioning

confidence: 99%

Mechanochemical Treatment of Amorphous Silica Powder for Glasses Without Firing

2013

View full text Add to dashboard Cite

An amorphous silica powder was subjected to mechanical and hydrothermal treatment. Silanol surface groups, which play an active role in the chemical modification of silica, were produced by these two treatments. The surface activity of raw and treated powders was measured as the amount of dissolved Si4+ ion in ammonia (NH3) and potassium hydroxide (KOH) solutions at different concentrations. KOH solution was more effective than NH3 solution in activating the surface of the silica powder. Nonfiring glass was successfully fabricated using mechanochemically treated silica powder. Glass properties such as morphology and transparency were analyzed using scanning electron microscope and UV–vis–NIR techniques. Possible reaction mechanisms of powder surface activation occurring during hydrothermal and condensation processes are also discussed.

show abstract

Mechanochemical modification of silica

Cited by 11 publications

References 0 publications

Formation of Inorganic Supports and Components of Catalysts with the Help of Mechanical Activation

Formation of Inorganic Supports and Components of Catalysts with the Help of Mechanical Activation

Mechanical Treatment of Silica Powder

Mechanochemical Treatment of Amorphous Silica Powder for Glasses Without Firing

Contact Info

Product

Resources

About