Influence of Selected Alkoxysilanes on Dispersive Properties and Surface Chemistry of Titanium Dioxide and TiO<sub>2</sub>–SiO<sub>2</sub> Composite Material

Siwińska-Stefańska, Katarzyna; Ciesielczyk, Filip; Nowacka, Magdalena; Jesionowski, Teofil

doi:10.1155/2012/316173

Cited by 17 publications

(15 citation statements)

References 104 publications

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“…Samples were dispersed in propan-2-ol with the use of ultrasonic bath Sonic-3 (Polsonic, Warsaw, Poland) for 5 min (Cp = 0.05%). Moreover, the polydispersity index (PdI) was calculated with the use of cumulant analysis (the fit of a polynomial to the log of the G1 correlation function), which may be presented as Equation (2) [ 56 ]:

where b is the second order cumulant or the z-average diffusion coefficient, and c is the coefficient of the squared term, known as polydispersity when scaled as

.…”

Section: Methodsmentioning

confidence: 99%

Lignin-Based Spherical Structures and Their Use for Improvement of Cilazapril Stability in Solid State

et al. 2020

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Biopolymer-based spherical particles exhibit unique properties including narrow sizes and many functional groups on their surfaces. Therefore, they show great potential for application in many scientific and industrial processes. The main aim of this study was to prepare lignin-based spherical particles with the use of a cationic surfactant, hexadecyl(trimethyl)ammonium bromide (CTAB). In the first step, different preparation procedures were tested with varying parameters, including biopolymer and surfactant ratios, lignin filtration, and experimental time. The morphological and dispersion characteristics of the materials were determined to select the best samples with the most promising properties, which could then be tested for their acute toxicity. It was observed that almost all materials were characterized by spherical shapes in micro- and nanosizes. The sample with the best physicochemical properties was used for further analysis and then tested for medical applications: the improvement of the stability of a drug molecule, cilazapril (CIL). The formulated material (CIL@LC-2a 1:1 wt./wt.) exhibited outstanding properties and significantly improved the stability of cilazapril as tested in conditions of increased temperature and humidity. Lignin spherical particles may be employed as a promising material for shielding other active compounds from decomposition.

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where b is the second order cumulant or the z-average diffusion coefficient, and c is the coefficient of the squared term, known as polydispersity when scaled as

.…”

Section: Methodsmentioning

confidence: 99%

Lignin-Based Spherical Structures and Their Use for Improvement of Cilazapril Stability in Solid State

et al. 2020

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“…In the second step, the obtained titania powder was grafted with AAPTS-sample TA. Modification was performed using 1 wt.% of AAPTS (calculated for 100 g of TiO 2 ) prepared in a MeOH/deionized water mixture (4/1 v/v) and applying the socalled dry technique, described in detail in [24,25]. Titania was treated with AAPTS to obtain a positively charged surface, to enhance the interaction between titania and graphene oxide.…”

Section: Preparation Of Modified Titaniamentioning

confidence: 99%

Titanium dioxide/graphene oxide composite and its application as an anode material in non-flammable electrolyte based on ionic liquid and sulfolane

Kurc

Siwińska-Stefańska

Jakóbczyk

et al. 2016

J Solid State Electrochem

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A composite of aminosilane-grafted TiO 2 (TA) and graphene oxide (GO) was prepared via a hydrothermal process. The TiO 2 /graphene oxide-based (TA/GO) anode was investigated in an ionic liquid electrolyte (0.7 M lithium bis(trifluoromethanesulfonyl)imide (LiNTf 2 )) in ionic liquid (N-methyl-N-propylpyrrolidinium bis(trifluoromethanesulfonyl)imide (MPPyrNTf 2 )) at room temperature and in sulfolane (1 M lithium hexafluorophosphate (LiPF 6 ) in tetramethylene sulfolane (TMS)). Scanning and transmission electron microscopy (SEM and TEM) observations of the anode materials suggested that the electrochemical intercalation/deintercalation process in the ionic liquid electrolyte with vinylene carbonate (VC) leads to small changes on the surface of TA/GO particles. The addition of VC to the electrolyte (0.7 M LiNTf 2 in MPPyrNTf 2 + 10 wt.% VC) considerably increases the anode capacity. Electrodes were tested at different current regimes in the range 5-50 mA g . The decrease in anode capacity with increasing current rate was interpreted as the result of kinetic limits of electrode operation. A much lower capacity was observed for the system TA/GO│1 M LiPF 6 in TMS + 10 wt.% VC│Li.

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“…The obtained TEM images confirm that the particles had a spherical shape. A detailed procedure for the modification of the TiO 2 -SiO 2 oxide composite with silane proadhesive agents has been described in a previous publication [30].…”

Section: Particle Size Distributions and Surface Morphology Andmentioning

confidence: 99%

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

Nowacka

Ambrożewicz

Jesionowski

2013

Journal of Nanomaterials

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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.

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Influence of Selected Alkoxysilanes on Dispersive Properties and Surface Chemistry of Titanium Dioxide and TiO₂–SiO₂ Composite Material

Cited by 17 publications

References 104 publications

Lignin-Based Spherical Structures and Their Use for Improvement of Cilazapril Stability in Solid State

Lignin-Based Spherical Structures and Their Use for Improvement of Cilazapril Stability in Solid State

Titanium dioxide/graphene oxide composite and its application as an anode material in non-flammable electrolyte based on ionic liquid and sulfolane

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

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Influence of Selected Alkoxysilanes on Dispersive Properties and Surface Chemistry of Titanium Dioxide and TiO2–SiO2 Composite Material

Cited by 17 publications

References 104 publications

Lignin-Based Spherical Structures and Their Use for Improvement of Cilazapril Stability in Solid State

Lignin-Based Spherical Structures and Their Use for Improvement of Cilazapril Stability in Solid State

Titanium dioxide/graphene oxide composite and its application as an anode material in non-flammable electrolyte based on ionic liquid and sulfolane

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

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Influence of Selected Alkoxysilanes on Dispersive Properties and Surface Chemistry of Titanium Dioxide and TiO₂–SiO₂ Composite Material

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