Effect of surfactant concentration on the stability of aqueous titanium dioxide suspensions

1991 ◽  
Vol 143 (2) ◽  
pp. 434-439 ◽  
Author(s):  
Tatsuo Sato ◽  
Shigeru Kohnosu
Keyword(s):  
Titanium Dioxide ◽  
Surfactant Concentration ◽  
The Stability

scholarly journals A titanium dioxide–carbon nanotube hybrid to simultaneously achieve the mechanical enhancement of natural rubber and its stability under extreme frictional conditions

2021 ◽  
Vol 2 (7) ◽  
pp. 2408-2418
Author(s):  
Le Wan ◽  
Cong Deng ◽  
Ze-Yong Zhao ◽  
Hai-Bo Zhao ◽  
Yu-Zhong Wang
Keyword(s):  
Titanium Dioxide ◽  
Carbon Nanotube ◽  
Natural Rubber ◽  
Titanium Oxide ◽  
The Stability

Titanium oxide-carbon nanotube hybrids may efficiently promote the stability of nature rubber under extreme frictional conditions.

scholarly journals Thermal Properties and Non-Isothermal Crystallization Kinetics of Poly (δ-Valerolactone) and Poly (δ-Valerolactone)/Titanium Dioxide Nanocomposites

Crystals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 452 ◽  
Author(s):  
Waseem Saeed ◽  
Abdel-Basit Al-Odayni ◽  
Abdulaziz Alghamdi ◽  
Ali Alrahlah ◽  
Taieb Aouak
Keyword(s):  
Titanium Dioxide ◽  
Crystallization Kinetics ◽  
Isothermal Crystallization ◽  
Three Dimensional ◽  
Degree Of Crystallinity ◽  
Simultaneous Occurrence ◽  
Scanning Calorimetry ◽  
Isothermal Crystallization Kinetics ◽  
The Stability ◽  
Kinetics Of

New poly (δ-valerolactone)/titanium dioxide (PDVL/TiO2) nanocomposites with different TiO2 nanoparticle loadings were prepared by the solvent-casting method and characterized by Fourier transform infra-red, differential scanning calorimetry, X-ray diffraction and scanning electron microscopy, and thermogravimetry analyses. The results obtained reveal good dispersion of TiO2 nanoparticles in the polymer matrix and non-formation of new crystalline structures indicating the stability of the crystallinity of TiO2 in the composite. A significant increase in the degree of crystallinity was observed with increasing TiO2 content. The non-isothermal crystallization kinetics of the PDVL/TiO2 system indicate that the crystallization process involves the simultaneous occurrence of two- and three-dimensional spherulitic growths. The thermal degradation analysis of this nanocomposite reveals a significant improvement in the thermal stability with increasing TiO2 loading.

scholarly journals Synthesis and Research of Nanocompositions of Oxide Materials Based on Titanium Dioxide for use as Contrast Agents in Optical Coherence Tomography

2021 ◽  
pp. 325-338
Author(s):  
Artem Nikolaevich Kupriyanov ◽  
Diana Evgen’evna Fidarova ◽  
Linda Ruslanovna Makhmudova ◽  
Magomed Rasulovich Gadzhiev ◽  
Shuainat Ruslanovna Nimatulaeva ◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Titanium Dioxide ◽  
Contrast Agent ◽  
Contrast Agents ◽  
Elemental Composition ◽  
Zirconium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Optical Coherence ◽  
Oxide Materials ◽  
The Stability

In this paper, the contrasting properties of titanium dioxide nanoparticles in various compositions were considered. In the course of the work, methods for the synthesis of oxide materials SiO2-TiO2, SiO2-ZrO2, TiO2-ZrO2 and SiO2-TiO2-ZrO2 were developed; the microstructure of oxide materials SiO2-TiO2, SiO2-ZrO2, TiO2-ZrO2and SiO2-TiO2-ZrO2was studied; the stability of oxide materials SiO2-TiO2, SiO2-ZrO2, TiO2-ZrO2and SiO2-TiO2-ZrO2 was determined. The elemental composition of the oxide materials SiO2-TiO2, SiO2-ZrO2, TiO2-ZrO2and SiO2-TiO2-ZrO2 has also been studied using SEM and XRD methods. It was found that SiO2-TiO2-ZrO2 nanocomposites with content of titanium dioxide from 8 to 9.5 % and zirconium dioxide from 0.5 to 2 % are completely insoluble in a highly alkaline medium. Thus, this composition is the most optimal for use as a contrast agent in optical coherence tomography.

The Stability of Silane Layers on Titanium Dioxide Electrodes

1984 ◽  
Vol 131 (4) ◽  
pp. 799-803 ◽  
Author(s):  
R. Vithanage ◽  
H. O. Finklea
Keyword(s):  
Titanium Dioxide ◽  
The Stability

Effect of the Surfactant Concentration on Sinking Electric Discharge Machining Performance with Water-in-Oil Emulsion as Dielectric

2011 ◽  
Vol 189-193 ◽  
pp. 3153-3157
Author(s):  
Yan Zhen Zhang ◽  
Yong Hong Liu ◽  
Ren Jie Ji ◽  
Bao Ping Cai
Keyword(s):  
Physical Properties ◽  
Electric Discharge ◽  
Surfactant Concentration ◽  
Emulsion Stability ◽  
Experimental Results ◽  
Machining Performance ◽  
Electric Discharge Machining ◽  
Oil Emulsion ◽  
The Stability ◽  
Water In Oil Emulsion

In this paper, the EDM performance of water-in-oil (W/O) emulsions dielectric with different surfactant concentration is investigated by correlated to its physical properties, such as viscosity and droplets size, which is predominantly determined by the surfactant concentration. Experimental results show that the stability of the W/O emulsions increases with increasing surfactant concentration, whereas the EDM performance deteriorates with increasing surfactant concentration. So, taking a comprehensively consideration of the emulsion stability and EDM performance, the concentration of surfactant must be appropriately selected.

Preparation of Stable Hydrophilic Polyethyleneimine Cross-Linked Graphene Oxide/Titanium Dioxide Membranes for Dye Separation

NANO ◽  
2021 ◽  
pp. 2150008
Author(s):  
Hongwei Liu ◽  
Jinhua Liu ◽  
Jun Li ◽  
Zhanchao Liu ◽  
Weifu Wu ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Titanium Dioxide ◽  
Graphene Oxide ◽  
Water Flux ◽  
Cross Linking ◽  
Sunset Yellow ◽  
Water Contact ◽  
Static Water ◽  
The Cross ◽  
The Stability

An excellent novel laminar and hierarchical polyethyleneimine cross-linked graphene oxide/titanium dioxide (GO–TiO2–PEI) membrane was successfully prepared by vacuum filtration technology using polyethyleneimine (PEI) as the cross-linking agent and a GO–TiO2 nanocomposite as the substrate. The resultant membrane (GO–TiO2–PEI) displayed a favorable antifouling performance with bovine serum albumin (BSA) and showed good hydrophilicity and wettability, with a static water contact angle of 13.2∘. The stability of the GO–TiO2–PEI membrane in aqueous solution obviously improved with the cross-linking of PEI compared with that of the GO and GO–TiO2 membranes. The GO–TiO2–PEI membrane also exhibited a satisfactory water flux of 48.6[Formula: see text]L m[Formula: see text] h[Formula: see text] bar[Formula: see text]. The GO–TiO2–PEI membrane exhibited a good performance for effectively separating different dyes including methylene blue (MB), rhodamine B (RB), methyl orange (MO), sunset yellow (SY), new coccine (NC) and amaranth. All the above results suggested that the GO–TiO2–PEI membrane could be used as an excellent stable hydrophilic membrane for efficiently separating dyes from aqueous solution.

Surfactant Effects on Fluid-Elastic Instabilities of Liquid-Lined Flexible Tubes: A Model of Airway Closure

1993 ◽  
Vol 115 (3) ◽  
pp. 271-277 ◽  
Author(s):  
D. Halpern ◽  
J. B. Grotberg
Keyword(s):  
Film Thickness ◽  
Surfactant Concentration ◽  
Evolution Equations ◽  
Liquid Films ◽  
Nonlinear Evolution Equations ◽  
Small Airways ◽  
Airway Closure ◽  
Elastic Tubes ◽  
Critical Film Thickness ◽  
The Stability

A theoretical analysis is presented predicting the closure of small airways in the region of the terminal and respiratory bronchioles. The airways are modelled as thin elastic tubes, coated on the inside with a thin viscous liquid lining. This model produces closure by a coupled capillary-elastic instability leading to liquid bridge formation, wall collapse or a combination of both. Nonlinear evolution equations for the film thickness, wall position and surfactant concentration are derived using an extended version of lubrication theory for thin liquid films. The positions of the air-liquid and wall-liquid interfaces and the surfactant concentration are perturbed about uniform states and the stability of these perturbations is examined by solving the governing equations numerically. Solutions show that there is a critical film thickness, dependent on fluid, wall and surfactant properties above which liquid bridges form. The critical film thickness, εc, decreases with increasing mean surface-tension or wall compliance. Surfactant increases εc by as much as 60 percent for physiological conditions, consistent with physiological observations. Airway closure occurs more rapidly with increasing film thickness and wall flexibility. The closure time for a surfactant rich interface can be approximately five times greater than an interface free of surfactant.

scholarly journals Rapid inactivation of SARS-CoV-2 by titanium dioxide surface coating

2021 ◽  
Vol 6 ◽  
pp. 56
Author(s):  
Petra Micochova ◽  
Ambika Chadha ◽  
Timi Hesseloj ◽  
Franca Fraternali ◽  
Jeremy J. Ramsden ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Control Measure ◽  
Infection Control Measure ◽  
Atomic Ratio ◽  
Health Care Facilities ◽  
Target Cells ◽  
Ceramic Tiles ◽  
Live Virus ◽  
Significant Difference ◽  
The Stability

Background: Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) transmission occurs via airborne droplets and surface contamination. Titanium dioxide (TiO2) coating of surfaces is a promising infection control measure, though to date has not been tested against SARS-CoV-2. Methods: Virus stability was evaluated on TiO2- and TiO2–Ag (Ti:Ag atomic ratio 1:0.04)-coated 45 x 45 mm ceramic tiles. After coating the tiles were stored for 2–4 months before use. We tested the stability of both SARS-CoV-2 Spike pseudotyped virions based on a lentiviral system, as well as fully infectious SARS-CoV-2 virus. For the former, tile surfaces were inoculated with SARS-CoV-2 spike pseudotyped HIV-1 luciferase virus. At intervals virus was recovered from surfaces and target cells infected. For live virus,  after illuminating tiles for 0–300 min virus was recovered from surfaces followed by infection of Vero E6 cells. % of infected cells was determined by flow cytometry detecting SARS-CoV-2 nucleocapsid protein 24 h post-infection. Results: After 1 h illumination the pseudotyped viral titre was decreased by four orders of magnitude. There was no significant difference between the TiO2 and TiO2–Ag coatings. Light alone had no significant effect on viral viability. For live SARS-CoV-2, virus was already significantly inactivated on the TiO2 surfaces after 20 min illumination. After 5 h no detectable active virus remained. Significantly, SARS-CoV-2 on the untreated surface was still fully infectious at 5 h post-addition of virus. Overall, tiles coated with TiO2 120 days previously were able to inactivate SARS-CoV-2 under ambient indoor lighting with 87% reduction in titres at 1h and complete loss by 5h exposure. Conclusions: In the context of emerging viral variants with increased transmissibility, TiO2 coatings could be an important tool in containing SARS-CoV-2, particularly in health care facilities where nosocomial infection rates are high.

The Nano-Sized TiO2 Dispersions for Mass Coloration of Polyimide Fibers

2016 ◽  
Vol 1 (1) ◽  
pp. 29-44
Author(s):  
Natalja Fjodorova ◽  
Marjana Novic ◽  
Tamara Diankova ◽  
Anna Ostanen
Keyword(s):  
Thermal Stability ◽  
Titanium Dioxide ◽  
United Nations ◽  
Amic Acid ◽  
Fiber Structure ◽  
Polyimide Fibers ◽  
Classification And Labeling ◽  
Polyimide Fiber ◽  
The Stability ◽  
Thermal Stability Of

The implementation of nano-sized TiO2 dispersions for mass coloration of polyimide fibers is considered in the paper. Titanium dioxide (TiO2) is not classified as hazardous according to United Nations (UN) Globally Harmonized System of Classification and Labeling of Chemicals (GHS). The stability of TiO2 dispersions in dimethylformamide (DMF) medium in presence of different surfactants as well as the viscosity of poly(amic) acid spinning solutions was investigated. It was illustrated that nano fraction of mineral pigment increase the stability of spinning medium. Moreover, the introduction of 4,5% TiO2 in poly(amic) acid stabilized with 0,24% of surfactant (leukanol) caused the increasing of thermal stability on 10°C in comparison with non-colored fibers. Proposed method enables to get light colours and improve the thermal stability of polyimide fiber. The application of TiO2 in the mass coloration of fibers does not cause dangerous effect on consumer because the pigment is tightly connected with polymer inside fiber structure.

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