SIOH

AcronymDefinition
SIOHServer Input/Output Hub
SIOHSupervision, Inspection & Overhead
SIOHSteroid-Induced Ocular Hypertension (opthamology)
References in periodicals archive ?
The peak at 3.6-3.7 ppm is probably due to protons of H-bonded SiOH groups located in a second kind of crystallographic sites.
It is noteworthy that the average pore sizes of the obtained films decrease from 0.83 [micro]m, 1.09 [micro]m to 1.29 [micro]m when the SiOH contents increase from 25% to 100%.
The LF-chalcedony is a cryptocrystalline a-quartz (Si[O.sub.2]) that is 50-100 nm in size (Rios et al., 2001) and contains chemically bound hydroxyl groups in the form of silanole (SiOH) and molecular water ([H.sub.2]O) (Florke et al., 1982; Graetsch et al., 1985).
Sioh M, 1998, "Authorizing the Malaysian rainforest: configuring space, contesting claims and conquering imaginaries" Ecmene 5 144-166
Among these silanol groups, free SiOH groups are the most reactive groups and may provide the sites for the physical and chemical adsorption of silane coupling agents, (30) thus modifying the surface characteristics on silicates.
In some cases, the siloxane polymers possess functionality such that they can react to some extent with substrate surfaces or among themselves.Functionality of siloxane polymer water repellents usually consists of either silanol (SiOH), alkoxy (SIOR), or silicon hydride (SiH).
This phenomenon of adsorption is illustrated by the following chemical equations (1-3), where a silinol (SiOH) surface is used as an example;
Os materiais obtidos foram caracterizados por Espectroscopia na Regiao do Infravermelho, num espectrofotometro Bomem serie MB usando metodo do KBr, na regiao de 4000-400 [cm.sup.-1], com resolucao 4 [cm.sup.-1] e 30 scans, com o intuito de observar a presenca de grupos silanois (SiOH) originais e remanescentes na estrutura da silica e clarificar sobre a imobilizacao dos grupos organicos..
(2001), dependendo da pureza do herbicida, de 5 a 30% das moleculas de atrazina podem estar no estado protonado em pHs entre 2 e 3, ou seja, ha forte possibilidade de ocorrencia de interacao com os demais compostos ionizados ou grupos superficiais devido a presenca de cargas; entretanto, interacoes hidrofobicas, assim como as ligacoes de hidrogenio e formacao de complexos, evidentemente devem ser consideradas; a superficie do vidro e composta de ligacoes siloxanas (Si-O-Si) e sobretudo por grupos silanois (SiOH); os grupos silanois se distribuem aleatoriamente na superficie e sao por demais polares, embora na presenca de agua se possam dissociar gerando estruturas com cargas superficiais, segundo uma reacao simples do tipo (Sinton & Lacourse, 2001):
Para el catalizador 3.0Ni, los picos centrados a 300, 265 y 206[grados]C pueden atribuirse, respectivamente, a la reduccion de especies de nitrato de niquel con 1, 2 o 3 ligandos de [H.sub.2]O desplazados por grupos silanoles de la silice, resultando las especies Ni[(N[O.sub.3]).sub.2].5[H.sub.2]O.(SiOH), Ni[(N[O.sub.3]).sub.2].4[H.sub.2] O..2(SiOH) y Ni[(N[O.sub.3]).sub.2].3[H.sub.2]0.3(SiOH).
These free SiOH groups interact with polar molecules in an adsorptive manner.