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1

Preparation and characterization of BiOCl/TiO2/MMTcomposite materials

Tuo Biyang, Shi Xiulong, Tian Jinwang, Wang Jianli

Materials Science Poland

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2023

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Vol. 41, No. 2

354--367

EN

To broaden the light response range of TiO2 and improve its photocatalytic activity, BiOCl/ TiO2 /MMT composite materials(BTMC) with outstanding photocatalytic performance were prepared by the sol-gel method with montmorillonite (MMT) asthe supporting material, tetrabutyl titanate as titanium source and, bismuth nitrate pentahydrate as the bismuth source. Theproperties of the prepared materials were characterized by X-ray diffractometer (XRD), surface and porosity analysis (BET),scanning electron microscopy–energy-dispersive X-ray spectroscopy (SEM-EDS), transmission electron microscopy (TEM),X-ray photoelectron spectrometry (XPS), and ultraviolet-visible diffuse reflection spectroscopy (UV-Vis DRS). When the Bi/Timolar ratio was 20%, the composite material exhibited a slit mesoporous structure, and its specific surface area was 109.02m2/g, with optimum photocatalytic activity. TiO2 and BiOCl formed the type-II heterojunction on the surface of MMT, whichfacilitates the transfer of photogenerated electrons and holes, thus enhancing the photocatalytic activity of BTMC-20. Theresults of this study indicated that BTMC-20 is a promising photocatalytic composite material and has better photocatalyticproperties under visible light.

2

In vitro evaluation of stainless steel orthodontic wires coated with TiO2 and TiO2:Ag for their anti-adhesive and antibacterial efficacy against Streptococcus mutans in a sucrose-enriched environment

Bącela Justyna Joanna, Borak Beata, Sobieszczańska Beata, Walczuk Urszula, Detyna Jerzy, Sarul Michał

Materials Science Poland

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2023

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Vol. 41, No. 4

78--94

3

Investigations of CrN/TiO2 coatings obtained in a hybrid PVD/ALD method on Al-Si-Cu alloy substrate

Staszuk Marcin

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2023

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Vol. 71, nr 2

art. no. e144622

EN

The paper addresses an important scientific topic from the utilitarian point of view concerning the surface treatment of Al-Si-Cu aluminum alloys by PVD/ALD hybrid coating deposition. The influence of the conditions of deposition of titanium oxide in CrN/TiO2 coatings on their structure and properties, in particular corrosion resistance, were investigated. The TiO2 layer was produced by the atomic layer deposition (ALD) method with a variable number of cycles. Structural investigations were performed using scanning and transmission electron microscopy (SEM and TEM), atomic force microscopy (AFM), and Raman spectroscopy methods. Electrochemical properties were analyzed using potentiodynamic and electrochemical impedance spectroscopy (EIS) methods. The CrN/TiO2 hybrid coating with titanium oxide deposited at 500 ALD cycles showed the best corrosion properties. It was also found that the prerequisite for obtaining the best electrochemical properties was the amorphous structure of titanium oxide in the tested hybrid coatings. The high tribological properties of the tested coatings were also confirmed.

4

Characterization of SnO2/TiO2 with the Addition of Polyethylene Glycol via Sol-Gel Method for Self-Cleaning Application

Halin Dewi Suriyani Che, Azliza Azani, Razak Kamrosni Abdul, Abdullah Mohd Mustafa Al Bakri, Salleh Mohd Arif Anuar Mohd, Wahab Juyana A, Chobpattana Varistha, Kaczmarek Łukasz, Nabiałek Marcin, Jeż Bartłomiej

Archives of Metallurgy and Materials

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2023

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Vol. 68, iss. 1

243--248

EN

TiO2 is one of the most widely used metal oxide semiconductors in the field of photocatalysis for the self-cleaning purpose to withdraw pollutants. Polyethylene glycol (PEG) is recommended as a stabilizer and booster during preparation of water-soluble TiO2. Preparation of SnO2/TiO2 thin film deposition on the surface of ceramic tile was carried out by the sol-gel spin coating method by adding different amount of PEG (0g, 0.2g, 0.4g, 0.6g, 0.8g) during the preparation of the sol precursor. The effects of PEG content and the annealing temperature on the phase composition, crystallite size and the hydrophilic properties of SnO2/TiO2 films were studied. The X-ray diffraction (XRD) spectra revealed different phases existed when the films were annealed at different annealing temperatures of 350°C, 550°C and 750°C with 0.4 g of PEG addition. The crystallite sizes of the films were measured using Scherrer equation. It shows crystallite size was dependent on crystal structure existed in the films. The films with mixed phases of brookite and rutile shows the smallest crystallite size. In order to measure the hydrophilicity properties of films, the water contact angles for each film with different content of PEG were measured. It can be observed that the water contact angle decreased with the increasing of the content of PEG. It shows the superhydrophilicity properties for the films with the 0.8 g of PEG annealed at 750°C. This demonstrates that the annealed temperature and the addition of PEG affect the phase composition and the hydrophilicity properties of the films.

5

The role of TiO2 NPs catalyst and packing material in removal of phenol from wastewater using an ozonized bubble column reactor

Alattar Saja A., Sukkar Khalid A., Alsaffar May A.

Acta Innovations

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2023

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no. 46

93--105

EN

Phenol is present as a highly toxic pollutant in wastewater, and it has a dangerous impact on the environment. In the present research, the phenol removal from wastewater has been achieved using four treatment methods in a bubble column reactor (treatment by ozone only, using packed bubble column reactor with ozone, utilizing ozone with TiO2 NPs catalyst in the reactor without packing, and employing ozone with TiO2 NPs in the presence of packing). The effects of phenol concentration, ozone dosage, TiO2 NPs additions, and contact time on the phenol removal efficiency were determined. It was found that at a contact time of 30 min, the phenol removal was 60.4, 74.9, 86.0, and 100% for the first, second, third, and fourth methods, respectively. The results indicated that the phenol degradation method using catalytic ozonation in a packed bubble column with TiO2 NPs is the best treatment method. This study demonstrated the advantages of using packing materials in a bubble column reactor to enhance the mass transfer process in an ozonation reaction and then increase the phenol removal efficiency. Also, the presence of TiO2 NPs as a catalyst improves the ozonation process via the production of hydroxyl routs. Additionally, the reaction kinetics of ozonation reaction manifested that the first order model is more applicable for the reaction. Eventually, the packed bubble column reactor in the presence of TiO2 NPs catalyst provided a highperformance removal of phenol with a high economic feasibility.

6

Wpływ techniki nanoszenia warstw TiO2 na parametry fotowoltaiczne krzemowych ogniw słonecznych

Pich Robert, Bogdanowicz Krzysztof A., Gonciarz Agnieszka, Januszko Adam, Iwan Agnieszka

Przegląd Elektrotechniczny

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2022

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R. 98, nr 1

177--1179

PL

W pracy przedstawiono trzy techniki nanoszenia warstwy TiO2 jako powłoki samoczyszczącej na panelach fotowoltaicznych zainstalowanych na ekranach akustycznych, ułożonych wzdłuż linii kolejowych. Ogniwa słoneczne wraz z warstwą TiO2 poddano w warunkach laboratoryjnych badaniom wpływu naniesionych warstw na wartość parametrów fotowoltaicznych.

EN

The paper presents three techniques of obtaining TiO2 layers as the self-cleaning film on photovoltaic panels installed on acoustic screens arranged along railway lines. The solar cells with TiO2 layers were investigated in laboratory testing of the dependence of the applied layers on photovoltaic parameters.

7

Analiza właściwości hydrofilowych warstw TiO2 i TiO2-Ag w zależności od warunków atmosferycznych i modyfikacji syntezy dla zastosowań w fotowoltaice

Gonciarz Agnieszka, Bogdanowicz Krzysztof A., Pich Robert, Januszko Adam, Iwan Agnieszka

Przegląd Elektrotechniczny

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2022

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R. 98, nr 1

173--176

PL

W pracy przedstawiono metody otrzymywania warstw TiO2 bez i z Ag w celu zastosowania jako warstwa samoczyszcząca w panelach fotowoltaicznych zainstalowanych na ekranach akustycznych, ułożonych wzdłuż linii kolejowych. Wytworzone warstwy TiO2 poddano badaniom właściwości hydrofilowych w warunkach laboratoryjnych i atmosferycznych, uwzględniając jako zmienną technikę nanoszenia warstwy TiO2 (nanoszenie wirowe, listy rozwijającej), parametry techniczne (szybkość wirowania, grubość warstwy) oraz ilość srebra.

EN

The paper presents methods of obtaining TiO2 layers without and with Ag as the main layer component for self-cleaning layers on photovoltaic panels as an element acoustic screens arranged along railway lines. The hydrophilic properties of the produced TiO2 layers were investigated in laboratory and atmospheric conditions, taking into account the technique used to apply the TiO2 layer (spin-coating and doctor blade), technical parameters (spin speed, layer thickness) and the amount of silver.

8

High performance fluidized bed photoreactor for ethylene decomposition

Rychtowski Piotr, Miądlicki Piotr, Prowans Bartłomiej, Tryba Beata

Polish Journal of Chemical Technology

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2022

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Vol. 24, nr 2

50--56

EN

Removal of C2H4 in the air was carried out in the continuous flow reactor with the photocatalytic bed (expanded polystyrene spheres coated by TiO2 or SiO2/TiO2) under irradiation of UV light. Continuous flow of a gas stream through the reactor was realised at the static bed and under bed fluidization. The required flow of a gas stream through the reactor for bed fluidisation was 500–700 ml/min, whereas for the static bed the flow rate of 20 ml/min was used. Fluidized bed reactor appeared to be much more efficient in ethylene removal than that with the stationary bed. It was caused by the increased speed of C2H4 mass transfer to the photocatalyst surface and better utilization of the incident UV light. In the fluidized bed reactor calculated rate of C2H4 degradation was around 10 μg/min whereas in the stationary state 1.2 μg/min only.

9

Comparison between SEPs of CaCO3 and TiO2 in phosphor layer for better color uniformity and stable luminous flux of WLEDs with 7,000 K

Le Phan Xuan, Trang Tran Thanh, Anh Nguyen Doan Quoc, Lee Hsiao-Yi, Tho Le Van

Materials Science Poland

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2022

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Vol. 40, No. 1

1--8

EN

CaCO3 and TiO2 are proposed in this study as particles for scattering enhancement (SEPs) of phosphor-converted white light-emitting diodes (pc-WLEDs). The use of these two SEPs for scattering improvement enables boosting of the color homogeneity of the WLED devices. Each SEP is mixed with YAG:Ce3+ and silicone composition to examine their optical influences and performances on the high-power WLED packages with 7,000 K color temperature (CT). Miescattering theory is applied to calculate and investigate the scattering elements - scattering coefficients, anisotropic scattering, the reduced scattering, and scattering amplitudes - at the wavelengths of 450 nm and 550 nm. The results exhibit that TiO2and CaCO3 considerably promote higher color uniformity and color-deviated reduction, respectively. The obtained results could be primarily attributed to the significant improvement in the scattering properties of the structure. Additionally, the effects of the presented scattering enhancement on luminous efficiency are displayed. The reduction in lumen output is observed to have a close connection with the concentration and particle size of TiO2and CaCO3, which means that control must be exercised over these factors when utilizing these SEPs for WLED fabrication.

10

Preparation of Environmentally Friendly Adsorbent Using Oil Palm Boiler Ash, Bentonite and Titanium Dioxide Nanocomposite Materials

Bukit Nurdin, Ginting Eva Marlina, Frida Erna, Bukit Bunga Fisikanta

Journal of Ecological Engineering

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2022

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Vol. 23, nr 12

75--82

EN

Using the products derived from agricultural wastes as low-cost adsorbent materials to remove organic or inorganic contaminants would be ideal, as these materials are readily available in many countries. This study aimed to prepare environmentally friendly adsorbents made from nanocomposite OPBA / Bentonite / TiO2. The coprecipitation method was used in preparing OPBA, and CTAB surfactant was added in bentonite preparation. Meanwhile, the manufacture of TiO2 was carried out using the sol-gel method. Characterization was done by XRD, FTIR, SEM, and BET. The adsorbent spectra did not show a significant shift in absorption where the O-H bonds were becoming weaker due to the presence of TiO2 in the interlayer of bentonite. Another possibility is due to the influence of calcination and heating. The O-H groups of H2O are hydroxylated and dehydrated from within between layers. The formation of the composite OPBA/TiO2/Bentonite does not change the crystallinity of TiO2 significantly. This proves that there is no decrease in photocatalyst activity after the addition of OPBA and bentonite. The morphology of the whole sample has a flake-like structure that has pores. The addition of OPBA into Bentonite/TiO2 causes a decrease in the specific surface area of the sample.

11

Fabrication and Characterization of Polyphenylsulfone/Titanium Oxide Nanocomposite Membranes for Oily Wastewater Treatment

Al-Jadir Thaer, Alardhi Saja Mohsen, Alheety Mustafa A., Najim Aya A., Salih Issam K., Al-Furaiji Mustafa, Alsalhy Qusay F.

Journal of Ecological Engineering

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2022

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Vol. 23, nr 12

1--13

EN

Polyphenylsulfone (PPSU) membranes are critical for numerous applications, including water treatment, oil separation, energy production, electronic manufacturing, and biomedicine because of their low cost; regulated crystallinity; and chemical, thermal, and mechanical stability. Numerous studies have shown that altering the surface characteristics of PPSU membranes affects their stability and functionality. Nanocomposite membranes of PPSU (P0), PPSU-1%TiO2 (P1), and PPSU-2% TiO2 (P2) were prepared using the phase inversion method. Scanning electron microscopy and thermal analysis were performed to determine the contact angle and mechanical integrity of the proposed membranes. The results showed that the membranes contained channels of different diameters extending between 1.8 μm and 10.3 μm, which made them useful in removing oil. Thermal measurements showed that all of the PPSU membranes were stable at a temperature of not less than 240 °C, and had good mechanical properties, including tensile strength of 7.92 MPa and elongation of 0.217%. These properties enabled them to function in a harsh thermal environment. The experimental results of oil and water separation and BSA solution fouling on membrane P2 showed a 92.95% rejection rate and a flux recovery ratio of 82.56%, respectively, compared to P0 and P1.

12

Biosynthetic of Titanium Dioxide Nanoparticles Using Zizyphus Spina-Christi Leaves Extract: Properties

Alobaidi Tuqa B., Alwared Abeer I.

Journal of Ecological Engineering

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2022

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Vol. 23, nr 1

315--324

EN

The present project utilizes a straightforward, inexpensive, and environmentally friendly approach to produce Titanium dioxide nanoparticles utilizing Zizyphus Spina-Christi leaves (Z-TiO2). Ultra-Spectrophotometry (UV-Vis) was used to characterize the synthesized nanoparticles, which showed the production of nanoparticles at 320 nm absorbance. To investigate functional groups, Fourier Transform Infrared Spectroscopy (FTIR) has been used. The presence of Titanium Dioxide was verified using Energy Distribution X-ray Spectroscopy (EDS). Surface area is calculated using the Brunauer Emmett Teller (BET) formula. Images from Field Emission Electron Microscopy (FE-SEM) verified the nanoparticles' spherical shape and relatively homogenous size distribution. These findings demonstrated that the production of Z-TiO2 nanoparticles was successful.

13

Preparation and performance in IR and UV of transparent inorganic polysiloxane coating with dispersed TiO2 on glass substrates

Saudi S. A., Mohd A. F.

Journal of Achievements in Materials and Manufacturing Engineering

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2022

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Vol. 114, nr 2

49--56

EN

Purpose: The aim of the presented work was to develop an economical, transparent coating with dispersed TiO2 dispersion and inorganic polysiloxane resin for glass windows application and to study its effectiveness in filtering IR and UV radiations. Design/methodology/approach: Two oligomeric silanes were prepared in different molar ratios to produce inorganic polysiloxane resin. They were tested for their viscosity to reflect the completion of the reaction and form an amide linkage. FTIR was done to support the viscosity result by proving the presence of amide linkages. 10%, 20%, and 30% of compounded TiO2 were successfully dispersed in 0.3% sodium sulfosalicylate (dehydrated ethanol). Each TiO2 concentration was characterized for size distribution and polydispersity index (PDI). Additives solutions of 2-hydroxybenzophenone (HBP) and boron trifluoride (BF3) were also soluted in the same solvent. Glass substrates were coated with the formulations and tested for curing and hardness properties. Windows Energy Profiler (WEP) was used to study the UV, IR, and daylight transmission of the coated glasses. Findings: Each inorganic polysiloxane resin showed various viscosity values before reaching a constant state which designates complete formations of amide linkages. Polysiloxane resin with a viscosity value of 30.5 mPa/s was the most ideal to act as a binder. FTIR characterization proved the formation of amide linkages. The particle size distribution of TiO2 recorded the size of 87 nm after dispersion with correlating value of 1 PDI. The fastest drying time of 3 hours was recorded. The pencil hardness test quoted 6H pencil as the hardest pencil grade. WEP analysis of UV, IR, and daylight transmission gives satisfactory results of 0%, 7%, and 61%, respectively. Research limitations/implications: Laboratory analysis for viscosity tests often being held off. The test requires the samples to be transferred in a cylinder with an open-air spindle rotation. Samples react with the surrounding environment. Thus, polymerization takes place rapidly, resulting in hardened samples inside the cylinder. The different measure was taken by wrapping the testing area with aluminium foil. This research was conducted under equatorial climate. Practical implications: The obtained test results may contribute to the conclusion of transparent TiO2 nano-particles coating on glass substrates for windows application. This can reduce the electricity usage in buildings for artificial cooling to provide indoor thermal comfort. Smart coating formulations have a noticeable effect on filtering harmful solar radiation. Originality/value: This study presents the economical and undemanding ways to develop transparent smart coating formulation with superior performance against solar radiation. It is expected to have a bright potential in the architectural industry.

14

Synthesis and characterization of TiO2/ZSM-5 photocatalysts for degradation of rhodamine

Liu Rulai, Hu Jiapeng, Rau Juiye, Lin Hao, He Huan, Gao Biao, Lai Wenliang

Environment Protection Engineering

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2022

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Vol. 48, nr 2

29--42

EN

ZSM-5 synthesized by the hydrothermal method from raw kaolin clay was used as support to prepare TiO2/ZSM-5 catalysts via the sol-gel method. All prepared samples were characterized by X-ray fluorescence spectrometry (XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared (FT-IR), ultraviolet-visible spectroscopy (UV-Vis), transmission electron microscopy (TEM), particle size analysis and surface area measurement. The photocatalytic performance of TiO2/ZSM-5 was investigated based on rhodamine B (RhB) removal under UV radiation (450-600 nm. The results showed that the kaolin clay was successfully transformed into ZSM-5. The BET surface area and pore size distribution of the synthesized ZSM-5 were 364 m2/g and 0.54 nm, respectively. SEM and TEM revealed that TiO2 nanoparticles were well distributed on the surface of ZSM-5. The composite TiO2/ZSM-5 catalyst showed 98.53% removal, which is higher than that of pure TiO2 (80.13%) due to adsorption and degradation of RhB (5.0 mg/dm3) under 60 min UV light irradiation at 1 g/dm3 photocatalyst loading. The synergistic effect of TiO2 and ZSM-5, including adsorption, conduction band electron (e-), and valence-band holes (h+), makes the composite superior to pure TiO2, showing its potential for the degradation of organic dye.

15

Application of M2+ (Magnesium, Zinc)/Alumina-Metal Oxide Composites as Photocatalysts for the Degradation of Cationic Dyes

Yuliasari Nova, Wijaya Alfan, Amri, Mohadi Risfidian, Elfita, Lesbani Aldes

Ecological Engineering & Environmental Technology

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2022

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Vol. 23, iss. 4

125--135

EN

The development of studies on layered double hydroxide (LDH) material as a photocatalyst for the degradation of dye pollutants continues to increase. LDH is an anionic clay, which is a natural or synthetic mixed metal hydroxide. Pristine LDH is written as M2+/M3+ LDH, (M is metal ion). This study prepared pristine Mg/Al LDH and Zn/Al LDH composited with metal oxide TiO2 and ZnO, respectively. Composite is denoted by M2+/M3+ -metal oxide. The coprecipitation method used was accompanied by calcination of the composite at a temperature 300 °C that was not high. The prepared composites were morphologically characterized by SEM. The materials that had been used until the fifth cycle of regeneration were characterized by XRD and FTIR which still indicated the presence of LDH-metal oxide composite structure. The materials degraded cationic dyes namely rhodamine-B (RhB) and methylene blue (MB). RhB degraded better than MB by pristine LDH and composites. The percent degradation of RhB for pristine Mg/Al LDH, composites Mg/Al-TiO2 and Mg/Al-ZnO were 53.1%, 59.8%, 62.8%, respectively. The percent RhB degradation for pristine Zn/Al LDH, composites Zn/Al-TiO2 and Zn/Al-ZnO were 51.4%, 58.5%, 58.9%, respectively. The percentage of degradation indicates that the LDH-metal oxide composite has succeeded in increasing the photodegradation catalytic ability and the regeneration ability of LDH pristine.

16

Hardness and dry sliding wear behaviour of Al7050 hybrid composites produced by stir casting

Srivallirani Katepalli, Venkateswara Rao M

Composites Theory and Practice

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2022

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R. 22, nr 3

150--159

EN

Hardness and dry sliding wear behaviour of Al7050 hybrid composites produced by stir casting The current study aims to investigate at the tribological properties of Al7050 reinforced with TiO2 and BN particles utilising a pin-on-disc apparatus. By means of the stir-casting process, MMCs were fabricated with three different weight percentages of TiO2 particles: 1, 3, and 5%, as well as various weight percentages of h-BN particles: 2, 4, and 6%. The volumetric wear rates and coefficients of friction were continuously recorded under normal loads of 20-40 N, sliding speeds of 2-4 m/s and for sliding distances of 1000, 1500 and 2000 m. Microstructural analysis revealed that the TiO2 and BN particles were uniformly dispersed throughout the Al7050 matrix with minimal agglomeration. The experimental data reveals that the tensile strength and Vickers hardness of the cast hybrid composites gradually improved by increasing the weight percentages of the TiO2 and h-BN reinforcing particles. The worn micrographs reveal that abrasion and delamination are the dominant wear mechanisms in the case of the hybrid composites. The composite containing 6 wt.% h-BN particles had the lowest coefficient of friction and wear rate at a normal load of 40 N, sliding speed of 4 m/s and for the sliding distance of 2000 m when compared to other composites. On the other hand, the composites with 2 wt.% h-BN particles had the highest coefficient of friction and wear rate. The XRD analysis showed the generation of strong interfacial reactions, which contributed to the hardness of the hybrid composites.

17

Synthesis of magnesium aluminate spinel doped TiO2 from magnesite waste

Canikoğlu Nuray

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 1

311--316

EN

Magnesium aluminate spinel (MgAl2O4) is an important refractory material of magnesia origin. It is formed by the reaction of magnesium and aluminum oxides. In this study, TiO2 was added to magnesite waste and alumina (Al2O3) powders in different proportions and the mixtures were sintered at different temperatures after shaping. The aim of this study was to produce spinel economically by recycling waste materials. Therefore, titanium dioxide (TiO2) added magnesium aluminate spinel was produced and the products obtained were characterized by XRD and SEM-EDS analyses. In addition, bulk density, apparent porosity and microhardness values were measured and the effects of TiO2 additive on magnesium aluminate properties were examined. The better values were determined in samples doped 4 wt.% TiO2 at the sintering temperature of 1400°C.

18

Influence of Flame Retardant and Processing Conditions on Selected Properties of Mouldings Made of ABS

Trzaskalska Milena

Archives of Metallurgy and Materials

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2022

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Vol. 67, iss. 4

1381-1386

EN

Thanks to dyeing of polymers, the possibilities of their use are constantly increasing. It is equally important to use additives that will have several functions. A perfect example is titanium dioxide used as an optical brightener and a flame retardant at the same time. Mostly it is used in the form of a powder. However, there are no studies where TiO2 is used as a colourbatch based on the different polymer matrix. The aim of the work was to investigate the effect of titanium white in the form of colourbatch on the flammability and selected properties of mouldings produced in various processing conditions. Colourbatch based on PS matrix, was used in the research. The variable processing parameters were: injection temperature Tw, volume flow rate Vw, residence time and the addition of a colourbatch. On the basis of the measurements, it was found that the processing conditions and the addition of the colourbatch have low effect on the hardness of the mouldings, which was in the range from 75.59° Sh D (Shore type D) to 81.95° Sh D. It was also noted that the addition of colourbatch with TiO2 and increasing injection temperature reduces impact strength even by several dozen percent. Moreover, it was found that use of TiO2 causes a delay in the ignitability of the samples in selected cases. It is difficult to determine whether the variable processing conditions or the addition of TiO2 on the PS matrix have a greater impact on the ignitability of the moulded parts.

19

Fotokatalityczny rozkład wybranych bojowych środków trujących za pomocą modyfikowanego powierzchniowo ditlenku tytanu

Ratajewska Krystyna, Wiaderek Barbara, Rzadkowska Klaudia, Daniluk Ewa, Mazierski Arkadiusz, Furtak Elwira

Przemysł Chemiczny

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2021

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T. 100, nr 11

1111--1115

PL

Badano fotokatalityczny rozkład bojowych środków trujących na modyfikowanym tlenku tytanu(IV). Zaobserwowano zmiany stężenia par iperytu siarkowego w próbkach ze zmodyfikowanym tlenkiem tytanu(IV). W przypadku badań prężności par somanu nie zaobserwowano znaczącej zmiany ich stężenia w obecności sorbentu. Wyniki badań wskazują na potencjalne możliwości wykorzystania modyfikowanego powierzchniowo TiO₂ jako nieorganicznego odkażalnika.

EN

A surface-modified TiO₂ with Ag, Cr or Nd ions was placed in tightly closed vials with a chem. warfare agent (S mustard or soman). Changes in the vapor pressure of the warfare gases over the TiO₂ samples were measured by means of GC anal. The results were compared with the photocatalytic decompn. of chem. warfare agents in the presence of unmodified TiO₂. 88-98% S mustard decompn. in the presence of modified TiO₂ was obtained. In the case of soman vapors, no significant changes in concns. were observed in the presence of sorbent.

20

Thermal gravimetric analysis of glass fiber reinforced composite for understanding the impact of copper oxide in relation to titanium oxide filler particles

Alam Shahinoor, Chowdhury Mohammad Asaduzzaman

Composites Theory and Practice

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2021

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R. 21, nr 1-2

12--21

EN

In this work, the composite samples required to investigate their thermal properties were fabricated employing the conventional hand lay-up technique, followed by a light compression molding process. A fixed weight of plain woven glass fiber and epoxy with four different types of fillers as calcium carbonate (CaCO3), aluminum oxide (Al2O3), magnesium oxide (MgO) and titanium oxide (TiO2) or copper oxide (CuO) of different weights (5, 10 and 15 g) were studied. According to thermal gravimetric analysis (TGA), it was observed that the melting point (Tm) and glass-transition temperature (Tg) are affected by the presence of CuO and TiO2, which indicate the degree of composite crystallinity established by the stronger interfacial interaction by the CuO than that of the TiO2 particles and the amorphous region of the chain. These studies were supported by examination of the surface morphology of the composites by means of scanning electron microscopy (SEM).