Down-conversion particles as internal UV-source assist in UV-curing systems: Physical and mechanical properties of UV-curable micro-composites

Darani, Masoume Kaviani; Bastani, Saeed; Ghahari, Mehdi; Kardar, Pooneh; Mohajerani, Ezeddin

doi:10.1016/j.porgcoat.2018.01.022

Cited by 6 publications

(2 citation statements)

References 15 publications

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“…Upconversion (UC) luminescence refers to the optical process in which low-energy photons can be converted into high-energy photons. In the past decades, UC fluorescence materials doped with lanthanide ions have been remarkably considered and accepted as multi-functional mediums in a wide range of areas, including volumetric display, anticounterfeiting, laser optics, optical communication and bio-imaging due to their unique chemical and photophysical properties such as significant antiStokes shifts, multiple emission peaks and long fluorescence lifetimes (Darani et al , 2018; Jalili et al , 2018; Wang and Liu, 2009).…”

Section: Introductionmentioning

confidence: 99%

The role of chelating agent on the structure and up-conversion property of NaLuF4:Yb,Tm as security ink phosphor

Bastani

Jalili

Ghahari

et al. 2022

PRT

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Purpose This study aims to investigate the effect of trisodium nitrilotriacetic acid (NTA) on the physical and luminescence emission properties of NaLuF4:Yb, Tm Upconversion (UC) particles and compared with trisodium citrate (CA). Upconversion materials have been remarkably considered in many applications in the past decades. However, the morphology of the UC particles affects their emission properties, depending on the synthesis situation. Design/methodology/approach The UC particles were synthesized by the hydrothermal method. Properties such as crystal phase, particle morphology, particle size, smoothness and uniformity of particle surface and their emission intensity in the UV–Vis region were studied. Findings Observations showed that pH is an essential factor in determining the crystalline phase. In addition, quality factors affect the morphology, particle size and surface smoothness of crystalline facets. It was also found that the UC particles synthesized in the presence of trisodium NTA have a much higher emission intensity than those synthesized in the presence of CA. The use of UC particles in security inks to maintain the brand was also investigated. Originality/value To the best of the authors’ knowledge, for the first time, the effect of trisodium NTA as a chelating agent was investigated on morphology and UC intensity of NaLuF4:Yb,Tm phosphor.

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Section: Introductionmentioning

confidence: 99%

The role of chelating agent on the structure and up-conversion property of NaLuF4:Yb,Tm as security ink phosphor

Bastani

Jalili

Ghahari

et al. 2022

PRT

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“…However, this curing technique is usually limited to thin composite structures, because thicker parts require a longer curing period to fully penetrate the radiation, thereby reducing the efficiency of the production [7]. Moreover, it is reported that UV-curable composites suffer from low conversion due to the low penetration depth of the radiation as a result of the absorption of light by fibres and fillers, resulting in poor mechanical properties [8,9]. Thus, it is a controlled technology when in the field of coatings or thin films, but it needs adjustments to be applied to the curing of thick materials [10] For these reasons, a new manufacturing process based on UV-cured pre-impregnated materials (UV prepreg) has been developed.…”

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confidence: 99%

Influence of the Fibre Content, Exposure Time, and Compaction Pressure on the Mechanical Properties of Ultraviolet-Cured Composites

Perez-de-Eulate¹,

Iztueta²,

Gondra

et al. 2020

J. Compos. Sci.

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A new process for the impregnation, consolidation, and curing of glass-fibre-reinforced polyester composites was developed to reduce manufacturing costs and secure end properties that compete with other traditional materials. This new process, based on the ultraviolet (UV) curing of prepregs, could be a viable alternative to infusion and other processes. In this paper, we showed that glass fibre composites 3 mm thick could be easily formed using suitable photoinitiating systems. We achieved improved mechanical properties through the application of favourable parameters to traditional manufacturing processes such as hand lay-up and infusion. The prepreg polymerization was monitored by dielectric analysis (DEA), and we evaluated the relationship between the UV radiation exposure time and curing degree. Both the exposure time and compaction pressure affected the fibre content of composites and interlaminar shear strength. Experimental results showed that compaction pressures higher than 4 bar are necessary to increase the mechanical properties of the UV-cured composites. Finally, the properties of the composites manufactured by this new process were compared to the properties of composites manufactured using traditional processes such as hand lay-up and infusion.

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Versatile up-converted emission microcrystals assisted photocuring for dental restorations

Liang

Zhang

et al. 2022

Optical Materials

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Down-conversion particles as internal UV-source assist in UV-curing systems: Physical and mechanical properties of UV-curable micro-composites

Cited by 6 publications

References 15 publications

The role of chelating agent on the structure and up-conversion property of NaLuF4:Yb,Tm as security ink phosphor

The role of chelating agent on the structure and up-conversion property of NaLuF4:Yb,Tm as security ink phosphor

Influence of the Fibre Content, Exposure Time, and Compaction Pressure on the Mechanical Properties of Ultraviolet-Cured Composites

Versatile up-converted emission microcrystals assisted photocuring for dental restorations

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