Nanostructured modification of mineral particle surfaces in Ca(OH)2–H2O–CO2 system

Yang, Yuxiang; Gai, Guo Sheng; Fan, Shimin; Hao, Xiang Yang; Chen, Q.R.

doi:10.1016/j.jmatprotec.2005.04.085

Cited by 15 publications

(10 citation statements)

References 5 publications

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“…It can be observed that with the increase in SCP thickness, the CCT decreases continuously and values as low as 4098 K are achieved. To the best of our knowledge, this is the lowest CCT obtained with a blue LED and a SCP, lower than the previously reported values of 5674 K 8 and 5639 K. 18 Temperature stability of emission is an important parameter, especially for HB configurations, where phosphor temperature is expected to rise. In a previous study, we have shown that YAG:Ce SCPs demonstrate a higher QE than best quality analogous CPPs, with an outstanding thermal stability of emission up to at least 300 °C.…”

Section: Resultsmentioning

confidence: 54%

“…(Y,Gd) 3 Al 5 O 12 :Ce single crystal growth has been reported for low nominal Gd concentrations (<2 at%), and the investigation of its performance as a phosphor material was started. 17,18 However, until now, there is no report about high Gd doping and its concentration effect. Important parameters such as quantum efficiency and thermal stability of (Y 1−x Gd x ) 3 Al 5 O 12 :Ce SCPs have not been investigated either.…”

Section: Introductionmentioning

confidence: 99%

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Growth and optical properties of (Y_1−xGd_x)₃Al₅O₁₂:Ce single crystal phosphors for high-brightness neutral white LEDs and LDs

Arjoca

Inomata²,

Matsushita

et al. 2016

CrystEngComm

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Gd x ) 3 Al 5 O 12 :Ce ((Y,Gd) 3 Al 5 O 12 :Ce) single crystal phosphors (SCPs) were successfully grown using the Czochralski method. The Gd segregation coefficient was determined. The lattice spacing, absorption and emission properties were systematically investigated as a function of Gd concentration in a wide temperature range. Gd incorporation red-shifts the SCP emission so that neutral white with correlated color temperatures in the range of 4098-6594 K can be achieved in conjunction with a blue light-emitting diode (LED). SCPs demonstrate high conversion efficiency (>90% above 150 °C) and better thermal stability compared to analogous ceramic powders. Additionally, SCPs are compatible with resin-free packaging, overcoming drawbacks associated with powder encapsulants. Therefore, (Y,Gd) 3 Al 5 O 12 :Ce SCPs are promising candidates for high-brightness neutral white sources based on intense blue LEDs and laser diodes.

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Section: Resultsmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Growth and optical properties of (Y_1−xGd_x)₃Al₅O₁₂:Ce single crystal phosphors for high-brightness neutral white LEDs and LDs

Arjoca

Inomata²,

Matsushita

et al. 2016

CrystEngComm

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“…The migration and exudation of IFR may occur under humid environments, which can lead to the decrease in flame retardancy. In addition, the smooth and flat surface of APP appears to be against the stable interface connection between the polymer matrix and particle surface [16]. Multitudinous additives and pathways have been tried in the surface modification of APP to overcome the above disadvantages [17,18].…”

Section: Introductionmentioning

confidence: 99%

Micro-Nanometer Particle Composition and Functional Design of Surface Nano-Structured Ammonium Polyphosphate and Its Application in Intumescent Flame-Retardant Polypropylene

Qin

Zhang

et al. 2022

Nanomaterials

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A novel composite and functional micro-nanometer particle is designed by the hydrolysis of aluminium isopropoxide on the surface of ammonium polyphosphate (APP) to prepare surface nanostructured ammonium polyphosphate (NSAPP). NSAPP is characterised by XPS, XRF, SEM, water solubility tests, and TGA. Results indicate that nanosized aluminium hydroxide is deposited on the surface of NSAPP, which enhanced its water resistance and thermostability. Then, APP and NSAPP coupled with dipentaerythritol (DPER) is used for the flame retardant of polypropylene (PP). The limiting oxygen index (LOI) value of the PP/DPER/NSAPP composite is higher than that of PP/DPER/APP. Besides, the UL 94 vertical burning test of PP/DPER/NSAPP composites can reach the V-0 rating easily. According to the study of the combustion behaviour of FR-PP composites, NSAPP contributes to form a dense and multi-layered char in the combustion process. Thus, such an intumescent char with a ceramic-like, continuous, and dense structure over the PP matrix protects the underlying matrix and enhances the thermal stability of the condensed phase, thereby improving the flame retardant performance of FR-PP.

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“…However, the incompatibility between its high energetic hydrophilic surface and the low‐energy surface of hydrophobic polymers is a problem needed to be solved before CaCO 3 and CaSO 4 can be used as hydrophobic fillers. In addition, these nanoparticles aggregate easily during the process of preparation and disposal [21]. Therefore, it is necessary to carry out the surface modification for improving the application performance.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of polyacrylamide‐calcium carbonate and polyacrylamide‐calcium sulfate nanocomposites

Pal

Jaiswar

2012

Polymer Composites

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Polyacrylamide‐calcium carbonate (PAM/CaCO3) and polyacrylamide‐calcium sulfate (PAM/CaSO4) nanocomposites were prepared via solution‐mixing technique. The resulting PAM‐based nanocomposites with various CaCO3 and CaSO4 nanoparticles contents (0–4% w/w) were investigated. Nanoparticles of CaCO3 and CaSO4 were synthesized by in situ deposition technique. In this technique, the surface modification of nanoparticles was performed by nonionic polymeric surfactant. The particle size of nanoparticles was recognized by X‐ray diffraction and scanning electron microscope (SEM) analysis which confirms that the particle has diameter of 25–33 nm. As prepared, nanocomposites films (thickness, 40‐μm) were characterized by Fourier transform infrared (FT‐IR), SEM, and energy‐dispersive X‐ray spectroscopy (EDS). FT‐IR shows the chemical structure of nanocomposites where as SEM analysis suggested that the nanofillers dispersed well in polymer matrix and EDS shows the elemental composition of the nanocomposite samples. Thermal properties of the nanocomposites were studied by using differential scanning calorimetric analysis. The PAM/CaCO3 and PAM/CaSO4 nanocomposites showed a higher glass transition temperature and a better thermal stability compared to the pure PAM. The glass transition temperature (Tg) of nanocomposites increases with increase in content of nanoparticles. It may be owing to the interaction between inorganic and organic components. POLYM. COMPOS.,, 2012. © 2012 Society of Plastics Engineers

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Nanostructured modification of mineral particle surfaces in Ca(OH)2–H2O–CO2 system

Cited by 15 publications

References 5 publications

Growth and optical properties of (Y_1−xGd_x)₃Al₅O₁₂:Ce single crystal phosphors for high-brightness neutral white LEDs and LDs

Growth and optical properties of (Y_1−xGd_x)₃Al₅O₁₂:Ce single crystal phosphors for high-brightness neutral white LEDs and LDs

Micro-Nanometer Particle Composition and Functional Design of Surface Nano-Structured Ammonium Polyphosphate and Its Application in Intumescent Flame-Retardant Polypropylene

Synthesis and characterization of polyacrylamide‐calcium carbonate and polyacrylamide‐calcium sulfate nanocomposites

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Nanostructured modification of mineral particle surfaces in Ca(OH)2–H2O–CO2 system

Cited by 15 publications

References 5 publications

Growth and optical properties of (Y1−xGdx)3Al5O12:Ce single crystal phosphors for high-brightness neutral white LEDs and LDs

Growth and optical properties of (Y1−xGdx)3Al5O12:Ce single crystal phosphors for high-brightness neutral white LEDs and LDs

Micro-Nanometer Particle Composition and Functional Design of Surface Nano-Structured Ammonium Polyphosphate and Its Application in Intumescent Flame-Retardant Polypropylene

Synthesis and characterization of polyacrylamide‐calcium carbonate and polyacrylamide‐calcium sulfate nanocomposites

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Growth and optical properties of (Y_1−xGd_x)₃Al₅O₁₂:Ce single crystal phosphors for high-brightness neutral white LEDs and LDs

Growth and optical properties of (Y_1−xGd_x)₃Al₅O₁₂:Ce single crystal phosphors for high-brightness neutral white LEDs and LDs