A review on polysiloxane-immobilized ligand systems: Synthesis, characterization and applications

El‐Nahhal, Issa M.; El‐Ashgar, Nizam M.

doi:10.1016/j.jorganchem.2007.03.009

Cited by 140 publications

(76 citation statements)

References 107 publications

(237 reference statements)

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“…Functionalization of the solid supports can be realized by functional silane coupling reagents. The polysiloxane sorbents functionalized with mercapto and amine groups are revealed in the literature as effective in the removal of metal ions [20][21][22][23][24][25][26] and Hg(II) [27,28]. In addition, bifunctional sorbents containing two functionalities (amine and mercapto) on the same sorbent had been prepared and used for the removal of metal ions [29].…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and application of a novel mercapto- and amine-bifunctionalized silica for speciation/sorption of inorganic arsenic prior to inductively coupled plasma mass spectrometric determination

Boyacı

Çağır

Shahwan

et al. 2011

Talanta

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a b s t r a c tA bifunctional sorbent, (NH 2 + SH)silica, containing both amine and mercapto functionalities was prepared by modification of silica gel with 3-(triethoxysilyl)propylamine and (3-mercaptopropyl)trimethoxysilane. In addition to the bifunctional sorbent, silica gel was modified individually with the functional mercapto-and amino-silanes, and the mono-functional sorbents, namely (SH)silica and (NH 2 )silica, were also mechanically mixed ((NH 2 )silica + (SH)silica) for the sake of comparison of sorption performances. It has been demonstrated that (SH)silica shows quantitative sorption only to As(III) at two pH values, 1.0 and 9.0, while (NH 2 )silica displays selectivity only towards As(V) at pH 3.0. On the other hand, the bifunctional (NH 2 + SH)silica possesses the efficient features of the two mono-functionalized sorbents; for example, it retains As(III) at a wider pH range, from 1.0 to at least 9.0 with the exception at pH 2.0, and it also shows quantitative sorption to As(V) at pH 3.0. This property gives the bifunctional (NH 2 + SH)silica a better flexibility in terms of sorption performance as a function of solution pH. The mechanically mixed (NH 2 )silica + (SH)silica exhibits a similar but less efficient sorption behavior compared to the bifunctional sorbent. Desorption of both As(III) and As(V) species can be realized using 0.5 M NaOH. The validity of the proposed method was checked through the analysis of a standard reference material and a good correlation was obtained between the certified (26.67 g L −1 ) and determined (27.53 ± 0.37 g L −1 ) values. Spike recovery tests realized with ultrapure water (93.0 ± 2.3%) and drinking water (86.9 ± 1.2%) also confirmed the applicability of the method.

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Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and application of a novel mercapto- and amine-bifunctionalized silica for speciation/sorption of inorganic arsenic prior to inductively coupled plasma mass spectrometric determination

Boyacı

Çağır

Shahwan

et al. 2011

Talanta

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“…Several theories have been proposed to explain the effect of heat treatment on the silane film: a) an enhanced inability of water to diffuse through the silane film due to increased cross-linking [5,19], b) oven heating could ensure complete bond formation between the silica matrix and the silane, resulting in oligomerization [19,20], c) evaporate solvent and volatilize products formed during condensation of the silanol groups in dry condition, could create large internal pressure gradients [9,21,22], and d) heating at 100°C could consolidate 3 regions of silane film into a innermost region without any interphase region [22]. The last theory was not in accordance with the results obtained in this study (Why?…”

Section: Discussionmentioning

confidence: 99%

“…FT-IR spectra can be used to provide useful information about the presence or absence of functional groups [4,7,21,23,24].…”

Section: Discussionmentioning

confidence: 99%

“…Water, alcohol, acetone, acetic acid and other by-products that remain in the pores of the network, if not completely expelled by drying procedure, may remain as hydrogen-bonded to the OH-rich silica fillers of the composite substrate. This may decrease the number of bond sites available for reacting with silane, thus compromising the final degree of siloxane bond formation [4,15,21]. The spectra of all temperatures above 38°C suggest that the heat treatment helps in the evaporation of solvent and volatile sub-products from the silane reaction, catalyzing and completing the condensation reactions both with the substrate and within the silane coating.…”

Section: Discussionmentioning

confidence: 99%

“…Since these small pores remain sealed, the presence of solvent can create great internal pressure gradients. This process could cause cracking and fracture in interphase [21].…”

Section: Discussionmentioning

confidence: 99%

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Surface characterization of feldspathic ceramic using ATR FT-IR and ellipsometry after various silanization protocols

et al. 2012

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OBJECTIVES: This study characterized the feldspathic ceramic surfaces after various silanization protocols. METHODS: Ceramic bars (2 mm × 4 mm × 10 mm) (N = 18) of feldpathic ceramic (VM7, VITA Zahnfabrik) were manufactured and finished. Before silane application, the specimens were ultrasonically cleaned in distilled water for 10 min. The ceramic specimens were randomly divided into nine groups (N = 2 per group) and were treated with different silane protocols. MPS silane (ESPE-Sil, 3M ESPE) was applied to all specimens and left to react at 20°C for 2 min (G20). After drying, the specimens were subjected to heat treatment in an oven at 38°C (G38), 79°C (G79) or 100°C (G100) for 1 min. Half of the specimens of each group were rinsed with water at 80°C for 15s (G20B, G38B, G79B, G100B). The control group (GC) received no silane. Attenuated total reflection infrared Fourier transform analysis (ATR FT-IR) was performed using a spectrometer. Thickness of silane layer was measured using a spectroscopic ellipsometer working in the = 632.8 nm (He-Ne laser) at 70°incidence angle. Surface roughness was evaluated using an optical profilometer. Specimens were further analyzed under the Scanning Electron Microscopy (SEM) to observe the topographic patterns. RESULTS: ATR FT-IR analysis showed changes in Si-O peaks with enlarged bands around 940 cm(-1). Ellipsometry measurements showed that all post-heat treatment actions reduced the silane film thickness (30.8-33.5 nm) compared to G20 (40 nm). The groups submitted to rinsing in hot water (B groups) showed thinner silane films (9.8-14.4 nm) than those of their corresponding groups (without washing) (30.8-40 nm). Profilometer analysis showed that heat treatments (Ra 0.10-0.19 m; Rq 0.15-0.26 m) provided a smoother surface than the control group (Ra 0.48 m; Rq 0.65 m). Similar patterns were also observed in SEM images. SIGNIFICANCE: Heat treatment after MPS silane application improved the silane layer network. Rinsing with boiling water eliminated the outmost unreacted regions of the silane yielding to thinner film thicknesses. ABSTRACTObjectives. This study characterized the feldspathic ceramic surfaces after various silanization protocols.Methods. Ceramic bars (2 mm x 4 mm x 10 mm) (N=18) of feldpathic ceramic (VM7, VITA Zahnfabrik) were manufactured and finished. Before silane application, the specimens were ultrasonically cleaned in distilled water for 10 min. The ceramic specimens were randomly divided into nine groups (n=2 per group) and were treated with different silane protocols. MPS silane (ESPE-Sil, 3M ESPE) was applied to all specimens and left to react at 20°C for 1 min (G20). After drying, the specimens were subjected to heat treatment in an oven at 38°C (G38), 79°C (G79) or 100°C (G100) for 1 min. Half of the specimens of each group were rinsed with water at 38°C, 79°C, 100°C for 15 s (G38B, G79B, G100B). The control group (GC) received no silane. Attenuated total reflection infrared Fourier transform analysis (ATR FT-IR) was performed using a spectrom...

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Luminescent organo‐polysiloxanes containing complexed lanthanide ions

Liu

Wang

et al. 2009

Applied Organom Chemis

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In this study, a type of polysiloxane with the ester as the functional side group was prepared via a hydrosilylation reaction. The functionalized polysiloxane was then allowed to complex with Tb 3+ and Eu 3+ ions. Fourier transform infrared, ultraviolet absorption spectra and 1 H-NMR, 13 C-NMR and 29 Si-NMR spectra were used to confirm the modification. Differential scanning calorimetry and thermal gravity analysis were used to study the polysiloxane's thermal properties. The complexes' luminescence spectra were recorded, and narrow-width green and red emissions were achieved.

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A review on polysiloxane-immobilized ligand systems: Synthesis, characterization and applications

Cited by 140 publications

References 107 publications

Synthesis, characterization and application of a novel mercapto- and amine-bifunctionalized silica for speciation/sorption of inorganic arsenic prior to inductively coupled plasma mass spectrometric determination

Synthesis, characterization and application of a novel mercapto- and amine-bifunctionalized silica for speciation/sorption of inorganic arsenic prior to inductively coupled plasma mass spectrometric determination

Surface characterization of feldspathic ceramic using ATR FT-IR and ellipsometry after various silanization protocols

Luminescent organo‐polysiloxanes containing complexed lanthanide ions

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