scholarly journals 3D Laser Nanoprinting of Optically Functionalized Structures with Effective-Refractive-Index Tailorable TiO2 Nanoparticle-Doped Photoresin

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 55
Author(s):  
Shichao Song ◽  
Yijie Li ◽  
Zhuofan Yao ◽  
Jie Li ◽  
Xiangping Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Titanium Dioxide ◽  
Effective Refractive Index ◽  
Titanium Dioxide Nanoparticles ◽  
Dark Field ◽  
Tio2 Nanoparticle ◽  
Direct Laser ◽  
The Matrix ◽  
Acrylate Resin ◽  
532 Nm

The advanced direct laser printing of functional devices with tunable effective index is a key research topic in numerous emerging fields, especially in micro-/nano-optics, nanophotonics, and electronics. Photosensitized nanocomposites, consisting of high-index materials (e.g., titanium dioxide, TiO2) embedded in polymer matrix, are emerging as attractive platforms for advanced additive manufacturing. Unfortunately, in the currently applied techniques, the preparation of optically functionalized structures based on these photosensitized nanocomposites is still hampered by many issues like hydrolysis reaction, high-temperature calcinations, and, especially, the complexity of experimental procedures. In this study, we demonstrate a feasible strategy for fabricating micro-/nanostructures with a flexibly manipulated effective refractive index by incorporating TiO2 nanoparticles in the matrix of acrylate resin, i.e., TiO2-based photosensitized nanocomposites. It was found that the effective refractive index of nanocomposite can be easily tuned by altering the concentration of titanium dioxide nanoparticles in the monomer matrix. For TiO2 nanoparticle concentrations up to 30 wt%, the refractive index can be increased over 11.3% (i.e., altering from 1.50 of pure monomer to 1.67 at 532 nm). Based on such a photosensitized nanocomposite, the grating structures defined by femtosecond laser nanoprinting can offer vivid colors, ranging from crimson to magenta, as observed in the dark-field images. The minimum printing width and printing resolution are estimated at around 70 nm and 225 nm, indicating that the proposed strategy may pave the way for the production of versatile, scalable, and functionalized opto-devices with controllable refractive indices.

scholarly journals Study on titanium dioxide nanoparticles as MALDI MS matrix for the determination of lipids in the brain

2021 ◽  
Vol 10 (1) ◽  
pp. 700-710
Author(s):  
Congnan Peng ◽  
Qian Zhang ◽  
Jian-an Liu ◽  
Zhen-peng Wang ◽  
Zhen-wen Zhao ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Titanium Dioxide ◽  
Titanium Dioxide Nanoparticles ◽  
Brain Homogenate ◽  
Maldi Ms ◽  
Absolute Ethanol ◽  
Future Research ◽  
Ionization Mass ◽  
The Matrix

Abstract The structures of lipids are diverse, and thus, lipids show various biological functions. Systematic determination of lipids in organisms has always been a concern. In this paper, a methodology on the matrix-assisted laser desorption ionization mass spectrometry (MALDI MS), with titanium dioxide nanoparticles (TiO2 NPs) as the matrix, was studied for lipid determination. The results showed that the following conditions were preferable in the determination of small-molecule lipids (such as hypoxanthine, guanosine, uridine, and cytidine), lipid standards (such as GC, GM, TG, phosphatidylethanolamine, phosphatidylcholine, and ceramide), and mixed lipids (extracted from brain homogenate with methanol alone and with the B&D method): TiO2 NPs as the matrix, absolute ethanol as the solvent, 1 mg of TiO2 NPs dispersed in 1 mL of absolute ethanol as the matrix solution, NaCl as the ionization reagent, and positive mass spectrometry (MS) as the mode. Modified TiO2 NP as a new matrix for MALDI MS will be a future research direction; in addition, the characteristics of TiO2 NPs make it a potential matrix for imaging MS.

scholarly journals Involvement of neurotrophins and related signaling genes in TiO2 nanoparticle – induced inflammation in the hippocampus of mice

2015 ◽  
Vol 4 (2) ◽  
pp. 344-350 ◽  
Author(s):  
Mingyu Su ◽  
Lei Sheng ◽  
Xiaoyang Zhao ◽  
Ling Wang ◽  
Xiaohong Yu ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Daily Life ◽  
Titanium Dioxide Nanoparticles ◽  
Tio2 Nanoparticle ◽  
Neurotoxic Effects

Titanium dioxide nanoparticles (TiO2 NPs) have been widely used in industry and daily life; their potential neurotoxic effects are of great concern.

Effect of Titanium Dioxide Nanoparticles on Mechanical and Thermal Properties of Poly(Lactic Acid) and Poly(Butylene Succinate) Blends

2014 ◽  
Vol 96 ◽  
pp. 33-38 ◽  
Author(s):  
Achanai Buasri ◽  
Gridtapas Buranasing ◽  
Ratchanon Piemjaiswang ◽  
Satit Yousatit ◽  
Vorrada Loryuenyong
Keyword(s):  
Titanium Dioxide ◽  
Lactic Acid ◽  
Thermal Properties ◽  
Titanium Dioxide Nanoparticles ◽  
Poly Lactic Acid ◽  
Mechanical And Thermal Properties ◽  
Butylene Succinate ◽  
Uniform Dispersion ◽  
Wide Range ◽  
The Matrix

Poly (lactic acid) (PLA) blended with poly (butylene succinate) (PBS) were prepared by using twin screw extruder and injection molding machine at various contents of PBS from 0-15 wt%. The surface of titanium dioxide (TiO2) nanoparticles was treated using aminopropyl trimethoxy silane (ATS) order to disperse them into the biopolymer blends. The mechanical and thermal properties of PLA/PBS/TiO2 nanocomposites were investigated over a range of filler content 0-5 wt%. All samples with a wide range of TiO2 addition exhibit the translucency. The surface morphology showed that the addition of PBS at 10 wt% was miscible with PLA while the other contents of PBS exhibited phase separation in the blends. Additionally, a uniform dispersion of filler in the matrix existed when the nanoparticles content was less than 3 wt%. The surface treated nanoparticles played an important role in mechanical and thermal properties of the nanocomposites because of its well dispersion and strong interfacial interaction between the nanoparticles and PLA/PBS matrix.

scholarly journals Comparing TiO2 nanoparticle formulations: stability and photoreactivity are key factors in acute toxicity to Daphnia magna

2019 ◽  
Vol 6 (8) ◽  
pp. 2532-2543 ◽  
Author(s):  
Jeffrey M. Farner ◽  
Rachel S. Cheong ◽  
Emeric Mahé ◽  
Hemanshu Anand ◽  
Nathalie Tufenkji
Keyword(s):  
Titanium Dioxide ◽  
Acute Toxicity ◽  
Daphnia Magna ◽  
Surface Waters ◽  
Titanium Dioxide Nanoparticles ◽  
Tio2 Nanoparticle ◽  
Key Factors ◽  
Environmental Surface

Given their widespread manufacture and use, it is anticipated that titanium dioxide nanoparticles (TiO2 NPs) will make their way into environmental surface waters where they may adversely impact biota.

scholarly journals Salt Stress Mitigation via the Foliar Application of Chitosan-Functionalized Selenium and Anatase Titanium Dioxide Nanoparticles in Stevia (Stevia rebaudiana Bertoni)

Molecules ◽  
2021 ◽  
Vol 26 (13) ◽  
pp. 4090
Author(s):  
Morteza Sheikhalipour ◽  
Behrooz Esmaielpour ◽  
Gholamreza Gohari ◽  
Maryam Haghighi ◽  
Hessam Jafari ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Salt Stress ◽  
Titanium Dioxide Nanoparticles ◽  
Chitosan Nanoparticles ◽  
Stevia Rebaudiana ◽  
High Salt ◽  
Steviol Glycosides ◽  
Rebaudioside A ◽  
Tio2 Nps ◽  
Stevia Rebaudiana Bertoni

High salt levels are one of the significant and major limiting factors on crop yield and productivity. Out of the available attempts made against high salt levels, engineered nanoparticles (NPs) have been widely employed and considered as effective strategies in this regard. Of these NPs, titanium dioxide nanoparticles (TiO2 NPs) and selenium functionalized using chitosan nanoparticles (Cs–Se NPs) were applied for a quite number of plants, but their potential roles for alleviating the adverse effects of salinity on stevia remains unclear. Stevia (Stevia rebaudiana Bertoni) is one of the reputed medicinal plants due to their diterpenoid steviol glycosides (stevioside and rebaudioside A). For this reason, the current study was designed to investigate the potential of TiO2 NPs (0, 100 and 200 mg L−1) and Cs–Se NPs (0, 10 and 20 mg L−1) to alleviate salt stress (0, 50 and 100 mM NaCl) in stevia. The findings of the study revealed that salinity decreased the growth and photosynthetic traits but resulted in substantial cell damage through increasing H2O2 and MDA content, as well as electrolyte leakage (EL). However, the application of TiO2 NPs (100 mg L−1) and Cs–Se NPs (20 mg L−1) increased the growth, photosynthetic performance and activity of antioxidant enzymes, and decreased the contents of H2O2, MDA and EL under the saline conditions. In addition to the enhanced growth and physiological performance of the plant, the essential oil content was also increased with the treatments of TiO2 (100 mg L−1) and Cs–Se NPs (20 mg L−1). In addition, the tested NPs treatments increased the concentration of stevioside (in the non-saline condition and under salinity stress) and rebaudioside A (under the salinity conditions) in stevia plants. Overall, the current findings suggest that especially 100 mg L−1 TiO2 NPs and 20 mg L−1 Cs–Se could be considered as promising agents in combating high levels of salinity in the case of stevia.

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