New Organic/Inorganic Pigments Based on Azo Dye and Aluminum-Magnesium Hydroxycarbonates with Various Mg/Al Ratios

Abstract

This study set out to investigate the impact of aluminum-magnesium hydroxycarbonates (LHs) with various Mg/Al ratios on the formation of hybrid pigments. The colorants were also evaluated for their flame-retardant properties. In the first part of the study, the hybrid pigments were submitted to comprehensive characterization using time-of-flight secondary ion mass spectrometry (TOF-SIMS), 27Al solid-state nuclear magnetic resonance (NMR) spectroscopy, powder X-ray diffraction analysis (XRD), thermogravimetric analysis (TGA), and N2 adsorption as well as scanning and transmission electron microscopy (SEM/STEM). The relationship between the Mg/Al ratios of the LH carriers and the formation of lake pigments was explored. The TOF-SIMS spectrum of LH modified with azo chromophore (AC) showed an intense peak for the C19H15O5N2Mg+ ion, confirming metal-dye interactions. Incorporation of the organic colorant into the LH host enhanced its resistance to dissolution in organic solvent (butyl acetate), as well as improving its color stability under elevated temperatures. The second part of the study evaluated the flammability of ethylene-norbornene (EN) composites, in which the pigments had been applied as colorants. Cone calorimetry revealed that addition of the organic-inorganic pigments resulted in a substantial improvement of the flame retardancy, reflected by the decreased values of the heat release rate (HRRMAX) and total heat release parameter (THR) of the EN composites in comparison to a neat sample (unfilled EN).

Recent developments in the preparation and assembly of two-dimensional plate materials in Langmuir–Blodgett films: a review

“…Similar results can be observed when a NiFe-LDH/N-Azo composite film is exposed to HCl gas and NH 3 gas. The color of the composite films in figure 6(b) changes from a transparent light brown color to a reddish brown after being exposed to HCl gas, and then returns to its original color after being exposed to NH 3 gas [31]. The results indicate that both LB films are sensitive to both acidic and alkaline environments.…”

“…The upper and lower parts of the laminate are arranged in a highly ordered manner between two cationic metal hydroxides, and the middle part of the layer is arranged by molecular or anionic insertion, thus it also known as layered bimetallic hydroxide [30]. The high oxygenation reaction performance of NiFe-LDH mean it can be used as a perfect electric conductor water oxidation cocatalyst for the inhibition of photogenerated electron-hole pair complexes [31,32]. As shown in figure 5, using the LB technique, NiFe-LDH is spread on the p-aminoazobenzene (N-Azo) solution and polyacrylic acid-azobenzene (PAA-Azo) solution surface to form NiFe-LDH/N-Azo and NiFe-LDH/PAA-Azo LB films.…”

Application and Perspectives: Magnesium Materials in Bone Regeneration

“…Additive manufacturing (AM) technology has received increasing attention recently because it can provide more precise control and complex porous structures than traditional manufacturing processes. , Traditional metal implants, such as stainless steel , and Ti, , have been widely used in the AM research. However, the progress of AM for manufacturing degradable Mg alloys still needs to face the difficulties in the preparation of Mg powder and in the characteristics of powder splash, crack, and flammability. , Ding et al proposed some corresponding countermeasures. The team has fabricated a new type of Mg alloy powder with smooth surface and good roundness and also further optimized the AM parameters .…”

“…100,101 Ding et al proposed some corresponding countermeasures. The team has fabricated a new type of Mg alloy powder with smooth Table 4.…”

Cu (II), Zn (II), and Ce (III) metal complexes as antimicrobial pigments for surface coating and flexographic ink

“…[ 13 ] Additionally, organic–inorganic pigments, which played dual roles in EN composites, were prepared and characterized by their intense color and flame retardancy. [ 14 ] Owing to their desirable optical attributes, such as brightness and chemical, thermal, and light stabilities, hybrid pigment materials are very crucial to recent applications. [ 15–18 ] Moreover, hybrid pigments can act as multifunctional additives because of the modifications of their different properties.…”