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

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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Dispersive evaluation and surface chemistry of advanced, multifunctional silica/lignin hybrid biomaterials

Open Chemistry ◽

10.2478/s11532-013-0322-4 ◽

2013 ◽

Vol 11 (11) ◽

pp. 1860-1873 ◽

Cited By ~ 6

Author(s):

Magdalena Nowacka ◽

Łukasz Klapiszewski ◽

Małgorzata Norman ◽

Teofil Jesionowski

Keyword(s):

Zeta Potential ◽

Surface Charge ◽

Electrochemical Sensors ◽

Relevant Information ◽

Structural Features ◽

Kraft Lignin ◽

Morphological Properties ◽

Wide Range ◽

Hybrid Biomaterials

AbstractAdvanced silica/lignin hybrid biomaterials were obtained using hydrated or fumed silicas (Aerosil®200) and Kraft lignin as precursors, which is a cheap and biodegradable natural polymer. To extend the possible range of applications, the silicas were first modified with N-2-(aminoethyl)-3-aminopropyltrimethoxsysilane, and then with Kraft lignin, which had been oxidized with sodium periodate. The SiO2/lignin hybrids and precursors were characterised by means of determination of their physicochemical and dispersive-morphological properties. The effectiveness of silica binding to lignin was verified by FT-IR spectroscopy. The zeta potential value provides relevant information regarding interactions between colloid particles. Measurement of the zeta potential values enabled an indirect assessment of stability for the studied hybrid systems. Determination of zeta potential and density of surface charge also permitted the quantitative analysis of changes in surface charge, and indirectly confirmed the effectiveness of the proposed method for synthesis of SiO2/lignin hybrid materials. A particularly attractive feature for practical use is their stability, especially electrokinetic stability. It is expected that silica/lignin hybrids will find a wide range of applications (polymer fillers, biosorbents, electrochemical sensors), as they combine the unique properties of silica with the specific structural features of lignin. This makes these hybrids biomaterials advanced and multifunctional.

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Polyethyleneimine‐modified porous aromatic framework and silane coupling agent grafted graphene oxide composite materials for determination of phenolic acids in Chinese Wolfberry drink by HPLC

Journal of Separation Science ◽

10.1002/jssc.201900766 ◽

2020 ◽

Vol 43 (4) ◽

pp. 774-781 ◽

Cited By ~ 1

Author(s):

Yaying Lv ◽

Tao Zhu

Keyword(s):

Graphene Oxide ◽

Composite Materials ◽

Phenolic Acids ◽

Coupling Agent ◽

Silane Coupling Agent ◽

Oxide Composite ◽

Porous Aromatic Framework ◽

Silane Coupling

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Authentication of the Ancient Easel / Paintings Through Materials Identification from the Polychrome Layers II. Analysis by Means of the FT-IR Spectrophotometry

Revista de Chimie ◽

10.37358/rc.08.4.1792 ◽

2008 ◽

Vol 59 (4) ◽

Cited By ~ 8

Author(s):

Irina Crina Anca Sandu ◽

Constantin Luca ◽

Ion Sandu ◽

Viorica Vasilache ◽

Mikiko Hayashi

Keyword(s):

Degradation Rate ◽

Animal Glue ◽

Painting Materials ◽

Ageing Rate ◽

Ir Spectrophotometry ◽

Private And Public ◽

Ft Ir

This is the second paper belonging to a study concerning the authentication of ancient easel-paintings, on canvas and wood support, from private and public collections, by using the FT-IR spectrophotometry technique for the analysis of the painting materials. Different pigments, egg binders, caseins and animal glue, often found in ancient easel-paintings on wood or canvas, have been used as standards for establishing the ageing rate of the paintings by correlation with the dates presented in the first note. The determination of the degradation rate of the painting materials is an important archaeometric characteristic used in authentication.

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Combination of Sorption Tube Sampling and Thermal Desorption with Hollow Waveguide FT-IR Spectroscopy for Atmospheric Trace Gas Analysis: Determination of Atmospheric Ethene at the Lower ppb Level

Analytical Chemistry ◽

10.1021/ac034396j ◽

2004 ◽

Vol 76 (2) ◽

pp. 464-468 ◽

Cited By ~ 19

Author(s):

Olga A. Pogodina ◽

Victor V. Pustogov ◽

Fabiano de Melas ◽

Christina Haberhauer-Troyer ◽

Erwin Rosenberg ◽

...

Keyword(s):

Ir Spectroscopy ◽

Thermal Desorption ◽

Gas Analysis ◽

Trace Gas ◽

Hollow Waveguide ◽

Ft Ir ◽

Atmospheric Trace Gas ◽

Analysis Determination ◽

Ft Ir Spectroscopy

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Determination of the Zeta Potential of Planar Solids in Nonpolar Liquids

Journal of Colloid and Interface Science ◽

10.1016/j.jcis.2021.02.044 ◽

2021 ◽

Author(s):

Dennis C. Prieve ◽

Benjamin A. Yezer ◽

Keyi Xu ◽

Aditya S. Khair ◽

James W. Schneider ◽

...

Keyword(s):

Zeta Potential ◽

Nonpolar Liquids

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Influence of the Share of Renewable Energy Sources on the Level of Energy Security in EECCA Countries

Energies ◽

10.3390/en14040903 ◽

2021 ◽

Vol 14 (4) ◽

pp. 903 ◽

Cited By ~ 1

Author(s):

Ivan Trifonov ◽

Dmitry Trukhan ◽

Yury Koshlich ◽

Valeriy Prasolov ◽

Beata Ślusarczyk

Keyword(s):

Renewable Energy ◽

Energy Security ◽

Structural Characteristics ◽

Renewable Energy Sources ◽

Energy Resource ◽

Energy Sources ◽

Structural Content ◽

High Degree

In this study we aimed to determine the extent to which changes in the share of renewable energy sources, their structural complex, and the level of energy security in Eastern Europe, Caucasus and Central Asia (EECCA) countries in the medium- and long-term are interconnected. The study was performed through modeling and determination of the structural characteristics of energy security in the countries. The methodology of the approach to modeling was based on solving the problem of nonlinear optimization by selecting a certain scenario. For the study, the data of EECCA countries were used. The ability of EECCA countries to benefit from long-term indirect and induced advantages of the transformation period depends on the extent to which their domestic supply chains facilitate the deployment of energy transformation and induced economic activity. This study provides an opportunity to assess the degree of influence of renewable energy sources on the level of energy security of countries in the context of energy resource diversification. The high degree of influence of renewable energy sources on energy security in the EECCA countries has been proven in the implementation of the developed scenarios for its increase. Energy security is growing. At the same time, its level depends not only on an increase in the share of renewable sources but also on the structure of energy resources complex of countries, and the development of various renewable energy sources. Therefore, today the EECCA countries are forced not only to increase the share of renewable energy sources but also to attach strategic importance to the structural content of their energy complex.

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Influence of a Natural Plant Antioxidant on the Ageing Process of Ethylene-norbornene Copolymer (Topas)

International Journal of Molecular Sciences ◽

10.3390/ijms22084018 ◽

2021 ◽

Vol 22 (8) ◽

pp. 4018

Author(s):

Anna Masek ◽

Angelika Plota

Keyword(s):

Mechanical Properties ◽

Food Packaging ◽

Colour Change ◽

Good Alternative ◽

Plant Origin ◽

Aging Behavior ◽

Current State ◽

Ft Ir ◽

Potential Use

In the field of polymer technology, a variety of mainly synthetic additives are used to stabilize the materials during processing. However, natural compounds of plant origin can be a green alternative to chemicals such as synthetic polyphenols. An analysis of the effect of hesperidin on the aging behavior of ethylene-norbornene copolymer was performed. The evaluation of changes in the tested samples was possible by applying the following tests: determination of the surface energy and OIT values, mechanical properties analysis, colour change measurements, FT-IR and TGA analyses. The obtained results proved that hesperidin can be effectively used as natural stabilizer for polymers. Furthermore, as a result of this compound addition to Topas-silica composites, their surface and physico-mechanical properties have been improved and the resistance to aging significantly increased. Additionally, hesperidin can act as a dye or colour indicator and only few scientific reports describe a possibility of using flavonoids to detect changes in products during their service life, e.g., in food packaging. In the available literature, there is no information about the potential use of hesperidin as a stabilizer for cycloolefin copolymers. Therefore, this approach may contribute not only to the current state of knowledge, but also presents an eco-friendly solution that can be a good alternative to synthetic stabilizers.

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Structural characteristics of plant cell wall elucidated by solution-state 2D NMR spectroscopy with an optimized procedure

Green Processing and Synthesis ◽

10.1515/gps-2020-0049 ◽

2020 ◽

Vol 9 (1) ◽

pp. 650-663

Author(s):

Wanwan Wang ◽

Jibao Cai ◽

Zhenyu Xu ◽

Yi Zhang ◽

Fanchao Niu ◽

...

Keyword(s):

Cell Wall ◽

Quantum Coherence ◽

Nmr Spectra ◽

Plant Cell Wall ◽

Milling Time ◽

Structural Characteristics ◽

2D Nmr ◽

2D Nmr Spectroscopy ◽

Complete Representation

AbstractA method was developed for rapid qualitative determination of lignocellulose in the tobacco cell wall by utilizing 2D heteronuclear single quantum coherence NMR spectra (2D HSQC NMR). Traditional methods for analyzing the structure of lignocellulose involve many steps of separation and extraction, which is labor-intensive. In this work, the whole cell wall was milled and dissolved in deuterium solvent. The solvent dimethylsulfoxide (DMSO-d6) containing hexamethylphosphoramide (HMPA-d18) enhanced swelling of the sample and gave high-resolution spectra. The tobacco samples are ball milled at different ball milling times, and the state of the particles is observed through an electron microscope, and then the probability of the particles being less than 5 µm is counted. Through the comparison of the abundance and integration of the peak signals in the spectra under different transmittances, it was determined that when the milling time was 6 h, the quality of the NMR spectra was the best. The optimum conditions of characterizing tobacco structure were DMSO-d6/HMPA-d18 solution and 6 h milling time. Under these conditions, complete representation of the structure of lignocellulose and simplified process could be achieved.

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