Synthesis and characterization of neodymium doped yttrium molybdate high NIR reflective nano pigments

Zhao, Xuejiao; Zhang, Yujun; Huang, Yan; Gong, Hongyu; Zhao, Jiaxing

doi:10.1016/j.dyepig.2015.01.018

Cited by 43 publications

(14 citation statements)

References 17 publications

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“…This makes them suitable for use as nontoxic, environmentally benign pigments . In addition, some of the systems, such as Y 6– x D x MoO 12+δ (D = Nd, Pr, Si) have been found to show a remarkable high reflectance in the NIR region of the solar spectrum. , This, along with the excellent thermal and chemical stabilities, renders the compounds promising for application in the energy sector as “cool pigments.”…”

Section: Introductionmentioning

confidence: 99%

Synthetic Access to Cubic Rare Earth Molybdenum Oxides RE₆MoO_12−δ(RE = Tm–Lu) Representing a New Class of Ion Conductors

et al. 2016

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Materials crystallizing in highly symmetric structures are of particular interest as they display superior physical properties in many relevant technological areas such as solid oxide fuels cells (SOFCs), catalysis, or photoluminescent materials. While the rare earth molybdenum oxides RE 6 MoO 12 with the large rare earth cations RE = La to Dy crystallize in a cubic defect fluorite structure type (Fm3̅ m, no. 225), the compounds with the smaller cations RE = Tm− Lu could hitherto only be synthesized in the rhombohedral defect fluorite structure type (R3̅ , no. 148). In the following, new low temperature access to the rare earth molybdenum oxides RE 6 MoO 12−δ (RE = Tm−Lu) crystallizing in the highly symmetric cubic bixbyite structure type (Ia3̅ , no. 206) will be discussed. The three-step method comprises preparation of the rhombohedral phases by solution combustion (SC) reactions, their reduction including simultaneous structural transitions from the rhombohedral to the cubic phases, and subsequent reoxidations while preserving their cubic structures. Detailed studies on this process were performed on the compound Yb 6 MoO 12−δ using TG-DTA, XPS, EDX, and X-ray powder diffraction (XRPD) measurements. In contrast to the rhombohedral phase Yb 6 MoO 12 , which does not show any ionic conductivity, the cubic bixbyite structured compound can be classified as a promising ionic conductor. Electrochemical impedance spectroscopy (EIS) revealed that bulk and grain boundary activation energy determined to be 144.6 kJ mol −1 and 150.4 kJ mol −1 , respectively, range in the same regime as the conventional ionic conductor 8-YSZ. Furthermore, the new cubic phase Yb 6 MoO 12−δ displays improved coloristic properties (UV−Vis spectroscopy) with a yellow hue value (CIE-Lab) being enhanced from b* = 26.0 of the rhombohedral to b* = 46.1 for the cubic phase, which is relevant for the field of inorganic pigments.

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Section: Introductionmentioning

confidence: 99%

Synthetic Access to Cubic Rare Earth Molybdenum Oxides RE₆MoO_12−δ(RE = Tm–Lu) Representing a New Class of Ion Conductors

et al. 2016

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“…These coatings reflect sunlight radiation in the infrared part of the spectrum (the half of the solar radiation) [11,12].…”

Section: Introductionmentioning

confidence: 99%

Designing multifunctional pigments for an improved energy efficiency in buildings

Aranzabe

Arriortúa

Larrañaga

et al. 2017

Energy and Buildings

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Buildings are responsible for 40% of the total energy use and 36% of total GHG emissions within the EU. Materials science offers solutions that when combined can offer energy savings in building sector. In this study, high reflectance coating and thermal storage capacity are combined with the aim of improving energy efficiency in buildings. For this issue a multifunctional pigment having a phase change material adsorbed on its surface and a high total solar reflectance has been manufactured.The total solar reflectance of the pigment will make the paint to reflect the sunlight radiation in the infrared part of the spectrum reducing the amount of absorbed radiation.This high reflection provides a surface level effect as is a passive stimulus-responsive solution that acts with sunlight radiation.On the other hand, the thermal storage capability provides a bulk level effect as is passive stimulus-responsive solution acting by temperature changes, making it possible to use constructive materials as a thermal energy storage media. The preparation process is described and the pigment is characterized conveniently. The thermal performance of corresponding pigmented coatings was evaluated by a simulated experiment in which two boxes were covered with the coating containing the multifunctional pigment and traditional pigmented coating on their tops. The indoor air temperature and the interior temperature of the substrate were measured obtaining differences of 4-5•C.

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“…Color was determined by optical spectroscopy using X-rite SP60 spectrophotometer. The total color difference parameter (Δ * ) was calculated according to following formulation [32]:…”

Section: Methodsmentioning

confidence: 99%

Effect of Quinacridone Pigments on Properties and Morphology of Injection Molded Isotactic Polypropylene

Barczewski

Matykiewicz

Hoffmann³

2017

International Journal of Polymer Science

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Two quinacridone pigments were added (0.01; 0.05; 0.1; 0.5; 1; 2 wt%) to isotactic polypropylene (iPP), and their influence on mechanical and thermomechanical properties were investigated. Complex mechanical and thermomechanical iPP properties analyses, including static tensile test, Dynstat impact resistance measurement, and hardness test, as well as dynamic mechanic thermal analysis (DMTA), were realized in reference to morphological changes of polymeric materials. In order to understand the differences in modification efficiency and changes in polymorphism of polypropylene matrix caused by incorporation of pigments, differential scanning calorimetry (DSC) and wide-angle X-ray scattering (WAXS) experiments were done. Both pigments acted as highly effective nucleating agents that influence morphology and mechanical properties of isotactic polypropylene injection molded samples. Differences between polypropylene samples nucleated by two pigments may be attributed to different heterogeneous nucleation behavior dependent on pigment type. As it was proved by WAXS investigations, the addition of γ-quinacridone (E5B) led to crystallization of polypropylene in hexagonal phase (β-iPP), while for β-quinacridone (ER 02) modified polypropylene no evidence of iPP β-phase was observed.

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Synthesis and characterization of neodymium doped yttrium molybdate high NIR reflective nano pigments

Cited by 43 publications

References 17 publications

Synthetic Access to Cubic Rare Earth Molybdenum Oxides RE₆MoO_12−δ(RE = Tm–Lu) Representing a New Class of Ion Conductors

Synthetic Access to Cubic Rare Earth Molybdenum Oxides RE₆MoO_12−δ(RE = Tm–Lu) Representing a New Class of Ion Conductors

Designing multifunctional pigments for an improved energy efficiency in buildings

Effect of Quinacridone Pigments on Properties and Morphology of Injection Molded Isotactic Polypropylene

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Synthesis and characterization of neodymium doped yttrium molybdate high NIR reflective nano pigments

Cited by 43 publications

References 17 publications

Synthetic Access to Cubic Rare Earth Molybdenum Oxides RE6MoO12−δ(RE = Tm–Lu) Representing a New Class of Ion Conductors

Synthetic Access to Cubic Rare Earth Molybdenum Oxides RE6MoO12−δ(RE = Tm–Lu) Representing a New Class of Ion Conductors

Designing multifunctional pigments for an improved energy efficiency in buildings

Effect of Quinacridone Pigments on Properties and Morphology of Injection Molded Isotactic Polypropylene

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Product

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Synthetic Access to Cubic Rare Earth Molybdenum Oxides RE₆MoO_12−δ(RE = Tm–Lu) Representing a New Class of Ion Conductors

Synthetic Access to Cubic Rare Earth Molybdenum Oxides RE₆MoO_12−δ(RE = Tm–Lu) Representing a New Class of Ion Conductors