Dispersive and electrokinetic evaluations of alkoxysilane-modified MgO·SiO2 oxide composite and pigment hybrids supported on it

Ciesielczyk, Filip; Nowacka, Magdalena; Przybylska, Agnieszka; Jesionowski, Teofil

doi:10.1016/j.colsurfa.2010.08.017

Cited by 10 publications

(5 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ¦-potential was determined for functionalizated system TiO 2 @SiO 2 -PABA, showing a value of ¹37.6 mV, which indicates that there is not a decrease in the electrokinetic instability of the compound. 46) The data confirmed the modification of carboxyl groups onto the silica surface, and the increase of the carboxyl groups onto the surface of silica particles as the molar ratio increased. Besides, a significant increase in aqueous dispersibility is another direct evidence that supports the presence of carboxyl groups on the surface of silica particles.…”

Section: Particle Size Analysis and ¦-Potential Determinationsupporting

confidence: 57%

TiO2@SiO2 Nanoparticles Functionalized with Para-Aminobenzoic Acid (PABA) by Fisher Esterification Reaction

et al. 2019

View full text Add to dashboard Cite

In this work, hybrid TiO 2 nanoparticles embedded in SiO 2 were obtained by means of sol-gel process, testing different proportions of the silicon and titanium oxides to obtain TiO 2 particles with a high surface content of hydroxyl groups. Anatase crystalline form of TiO 2 is a widely used material in active-substance release studies, due to its optimal properties for the transport, distribute and release of different molecules into biological systems. According to the X-ray diffraction analysis, all the proportions of evaluated hybrid systems presented the anatase phase, however, the molar proportion (20:80, TiO 2 :SiO 2) contains a high quantity of hydroxyl groups according to infrared spectroscopy. The spherical morphology of the particles were observed by scanning electron microscopy forming agglomerates. The functionalization of these surfaces was carried out using para-aminobenzoic acid as a drug-binding model that generated a covalent bond between the TiO 2 @SiO 2 system, likewise, thermogravimetric analysis identified the content of functionalized PABA. Dynamic light scattering showed particles and agglomerates around 25609 nm and negative value of zeta (¦)-potential in the molar ratio TiO 2 :SiO 2 20:80-PABA. Finally, we demonstrated that PABA hydrolyzes in the presence of human plasma, recovering the nanoparticularized systems with the hydroxyl groups. The hydroxyl groups on the particle surface promote the incorporation of organic molecules that contain carboxyl groups in their structure.

show abstract

Section: Particle Size Analysis and ¦-Potential Determinationsupporting

confidence: 57%

TiO2@SiO2 Nanoparticles Functionalized with Para-Aminobenzoic Acid (PABA) by Fisher Esterification Reaction

et al. 2019

View full text Add to dashboard Cite

show abstract

“…In our previously published researches, Ambrozewicz et al obtained hybrid materials based on magnesium silicate and POSS compounds. The inorganic matrix (MgO-SiO 2 ) was obtained according to the previously proposed method, described in [13]. The presented method in article [14] results confirmed that such products are thermally stable at the temperature of 600 ∘ C, which enables their use as fillers in the plastics industry.…”

Section: Introductionmentioning

confidence: 61%

“…Upon analysing the course of the electrokinetic curve for the unmodified TiO 2 -SiO 2 oxide composite it can be established that its zeta potential is decreasing with increasing the pH values, which confirms that the zeta potential value strongly depends on the pH value. The influence of the zeta potential on the distribution of the surface charge on oxide composites was presented detailed in previously published paper [13].…”

Section: Zeta Potential Of Tio 2 -Sio 2 /Ph-poss Tio 2 -Sio 2 /Ptmsmentioning

confidence: 99%

TiO₂‐SiO₂/Ph‐POSS Functional Hybrids: Preparation and Characterisation

Nowacka

Ambrożewicz

Jesionowski

2013

Journal of Nanomaterials

Self Cite

View full text Add to dashboard Cite

The results of studies involving the innovative TiO2-SiO2/Ph-POSS hybrid were presented. An inorganic TiO2-SiO2oxide composite was precipitated from an emulsion media. The functionalisation of surface for the obtained composite was carried out with the use of TriSilanolPhenyl POSS (Ph-POSS) and a silane coupling agent—phenyltrimethoxysilane (PTMS). Electrokinetic and physicochemical as well as structural characteristics of obtained hybrids were evaluated. The zeta potential value has been determined, which provides relevant information regarding the interactions between colloid particles. Measurement of the zeta potential values allowed for an indirect assessment of stability for the studied hybrid fillers. In the next step, the degree of dispersion and surface morphology were evaluated based on the obtained particle size distribution curves and TEM images. The hydrophilic-hydrophobic character of the surface was assessed by analysing the wettability profiles. The modification degree of the TiO2-SiO2oxide composite was evaluated based on the infrared spectroscopy studies (FT-IR). Determination of the parameters of the porous structure was conducted by determining the specific surface area and the total volume and mean size of pores. Thermogravimetric measurements (TGA) were also carried out in order to measure the changes in sample mass as a function of temperature.

show abstract

“…The Mg-Si hybrid oxide adsorbent was obtained in a modified co-precipitation method utilizing aqueous solutions of sodium silicate and magnesium sulphate, as described in previous reports (Ciesielczyk et al 2011(Ciesielczyk et al , 2013). An appropriate quantity (4 L) of 5 % solution of magnesium sulphate was placed in a reactor (10 L in capacity, QVF MiniPlant) equipped with a mechanical stirrer (Eurostar, IKA Werke), to which the same quantity of 5 % solution of sodium silicate was dosed at a rate of 1 L/h, utilizing peristaltic pump.…”

Section: Preparation and Characterization Of Mg-si Hybrid Oxide Adsormentioning

confidence: 99%

A comprehensive study of Cd(II) ions removal utilizing high-surface-area binary Mg–Si hybrid oxide adsorbent

Ciesielczyk

Bartczak

Jesionowski

2015

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

Presented work concerns the application of synthetic oxide adsorbent in the removal of cadmium ions from its model, water solutions. In this study, a novel magnesium-silicon (Mg-Si) binary oxide adsorbent was prepared by a modified co-precipitation method, utilizing sodium silicate and magnesium sulphate solutions as precursors of silica and magnesium oxide, respectively. The material was thoroughly characterized in order to evaluate chemical composition (AAS, EDS and gravimetric method), crystalline structure (XRD), morphology (SEM), particle size distribution (DLS), characteristic functional groups (FTIR) and porous structure parameters (BET and BJH models). It was proved that the adsorbent is amorphous, with a micrometric-sized, irregular-shaped particles and relatively large surface area of 540 m 2 /g. Batch adsorption experiments were conducted to investigate the adsorption of Cd(II) ions on the prepared adsorbent, including evaluation of adsorption kinetics, the intraparticle diffusion model, the effect of pH, contact time, mass of the adsorbent, temperature and the effect of competitive Cl -and NO 3 -anions. During the study, it was confirmed that the adsorption of Cd(II) ions reached equilibrium within 30 min, which was found to fit well with a pseudo-secondorder kinetic model type 1 (r 2 = 0.998-0.999). The Mg-Si adsorbent exhibited high adsorption capacity for Cd(II) ions at pH above 7, and the maximum quantity of cadmium(II) ions adsorbed in optimal time was achieved for the highest metal ion concentrations: 18.22 (Cl -) and 15.46(NO 3 -) mg/g. The competitive anions present in the model cadmium salt solutions hindered adsorption in the sequence Cl-.

show abstract

Dispersive and electrokinetic evaluations of alkoxysilane-modified MgO·SiO2 oxide composite and pigment hybrids supported on it

Cited by 10 publications

References 29 publications

TiO<sub>2</sub>@SiO<sub>2</sub> Nanoparticles Functionalized with <i>Para</i>-Aminobenzoic Acid (PABA) by Fisher Esterification Reaction

TiO<sub>2</sub>@SiO<sub>2</sub> Nanoparticles Functionalized with <i>Para</i>-Aminobenzoic Acid (PABA) by Fisher Esterification Reaction

TiO₂‐SiO₂/Ph‐POSS Functional Hybrids: Preparation and Characterisation

A comprehensive study of Cd(II) ions removal utilizing high-surface-area binary Mg–Si hybrid oxide adsorbent

Contact Info

Product

Resources

About

Dispersive and electrokinetic evaluations of alkoxysilane-modified MgO·SiO2 oxide composite and pigment hybrids supported on it

Cited by 10 publications

References 29 publications

TiO<sub>2</sub>@SiO<sub>2</sub> Nanoparticles Functionalized with <i>Para</i>-Aminobenzoic Acid (PABA) by Fisher Esterification Reaction

TiO<sub>2</sub>@SiO<sub>2</sub> Nanoparticles Functionalized with <i>Para</i>-Aminobenzoic Acid (PABA) by Fisher Esterification Reaction

TiO2‐SiO2/Ph‐POSS Functional Hybrids: Preparation and Characterisation

A comprehensive study of Cd(II) ions removal utilizing high-surface-area binary Mg–Si hybrid oxide adsorbent

Contact Info

Product

Resources

About

TiO₂‐SiO₂/Ph‐POSS Functional Hybrids: Preparation and Characterisation