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Kłonkowski, Andrzej M.; Widernik, Teresa; Grobelna, Beata; Jóźwiak, W. K.; Proga, H.; Szubiakiewicz, E.

doi:10.1023/a:1008703623418

Cited by 35 publications

(12 citation statements)

References 16 publications

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“…Other bands at 1106 and 455 cm −1 were assigned to the Si O Si vibrations. Specifically, the high-wavenumber band placed at 1106 cm −1 is attributed to the Si O Si symmetric stretching mode in cyclic structures and band with maximum at 455 cm −1 belongs to the bridging oxygen atom perpendicular to the Si O Si plane [21]. Moreover, the spectrum consists of several peaks which are attributed to the WO 4 2− group (1098, 830, 792 cm −1 ) [22].…”

Section: Ft-ir Spectramentioning

confidence: 99%

Luminescence based on energy transfer in xerogels doped with Ln2−xTbx(WO4)3

Grobelna¹

2007

Journal of Alloys and Compounds

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Section: Ft-ir Spectramentioning

confidence: 99%

Luminescence based on energy transfer in xerogels doped with Ln2−xTbx(WO4)3

Grobelna¹

2007

Journal of Alloys and Compounds

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“…Solid state NMR has been widely used in elucidating the structure of mesoporous silica and zeolites, particularly for determination of coordination environment of 29 Si and 27 Al. Fig.…”

Section: Nmr Analysismentioning

confidence: 99%

Elucidation of acid strength effect on ibuprofen adsorption and release by aluminated mesoporous silica nanoparticles

et al. 2015

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Mesoporous silica nanoparticles (MSN) with 1-10 wt% loading of aluminum (Al) were prepared and characterized by XRD, N 2 physisorption, 29 Si and 27 Al NMR, FT-IR and FT-IR preadsorbed pyridine. All samples were evaluated for ibuprofen adsorption and release. The results showed that MSN gave almost complete ibuprofen adsorption while the addition of 1, 5, and 10 wt% Al onto MSN (1Al-MSN, 5Al-MSN and 10Al-MSN) resulted in 35%, 58%, and 79% of adsorption, respectively. The characterization results elucidated that the highest adsorptivity of MSN was due to its highest surface silanol groups, while the increase in Brönsted acidity upon loading of Al provided more adsorption sites for the higher activity. Regardless of its highest adsorption capacity, MSN demonstrated the highest and fastest release ($100%)in 10 h, followed by 1Al-MSN, 5Al-MSN and 10Al-MSN. The increase in Al loading increased the acid sites that hold the ibuprofen molecules, which raised the retention in ibuprofen release. The pK a of Si-OH-Al that is lower than Si-OH sites also attracted the ibuprofen more strongly, which resulted in the slower release of Al-MSN as compared to MSN. The cytotoxicity study exhibited that ibuprofen loaded Al-MSN was able to reduce the toxicity in the WRL-68 cells, verifying its ability to hold and slow the release of ibuprofen as well as minimize the risk of drug overdose.

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“…4 illustrates the FT-IR spectra of MSN UN and MSN AP before and after the adsorption of MB. The MSN samples exhibited IR peaks at the bands attributed to SiAOASi bending (472 cm À1 ), defective structures (601 cm À1 ), SiAOASi symmetric stretching (811 cm À1 ), external SiAOH groups (978 cm À1 ), SiAOASi asymmetric stretching (1106 cm À1 ), water molecules retained by siliceous materials (1652 cm À1 ), and AOH stretching (3480 cm À1 , broad) [23,24]. After modification with APTES, the MSN still retained its siliceous structure, which confirmed that no major changes had occurred in the formation of its framework.…”

Section: Characteristics Of the Adsorbent Materialsmentioning

confidence: 99%