The thermal decomposition of natural mixtures of huntite and hydromagnesite

Hollingbery, L.A.; Hull, T. Richard

doi:10.1016/j.tca.2011.11.002

Cited by 62 publications

(46 citation statements)

References 35 publications

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“…Figure 3 shows the thermal decomposition, measured by TGA, of the ash residue obtained from the EVA compound containing a mixture of huntite and hydromagnesite compared to the thermal decomposition of the mixture of the two minerals alone. The thermal decomposition of the mineral powder shows the characteristic mass loss profile of the decomposition of hydromagnesite [1,3], releasing water at about 275°C and carbon dioxide at about 430°C, followed by the decomposition of huntite [1,3], releasing carbon dioxide at about 555°C and 690°C. The residue sample shows a small mass loss at around 100°C which is probably associated with moisture absorbed from the atmosphere in the time between combustion of the compound and testing of the residue.…”

Section: Effect Of Mineral Ratios On Combustion In the Cone Calorimetermentioning

confidence: 99%

“…This paper forms the final part in a recent series of papers by the current authors highlighting the thermal decomposition and fire retardant behaviour of natural mixtures of huntite and hydromagnesite [1][2][3][4]. Mixtures of huntite and hydromagnesite form naturally and are commercially mined and processed as an alternative to the commonly used mineral filler fire retardants, aluminium hydroxide (ATH) and magnesium hydroxide (MDH).…”

Section: Introductionmentioning

confidence: 99%

“…Previous authors have discussed the decomposition of huntite [1,3,4,[8][9][10][11] and hydromagnesite [1,3,4,8,[12][13][14][15][16][17][18][19][20][21][22][23][24]. Natural hydromagnesite particles have a blocky morphology [1,2] and once processed the majority of the particles are usually between 1 and 10 µm in diameter depending on the processing.…”

Section: Introductionmentioning

confidence: 99%

“…Natural hydromagnesite particles have a blocky morphology [1,2] and once processed the majority of the particles are usually between 1 and 10 µm in diameter depending on the processing. It has the following chemical formula [25] and thermally decomposes [1,3], between about 220°C and 550°C in two stages, initially releasing water then carbon dioxide, leaving a solid residue of magnesium oxide.…”

Section: Introductionmentioning

confidence: 99%

“…It has the following chemical formula [26] and thermally decomposes [1,3], between about 450°C and 750°C in two stages, releasing only carbon dioxide, leaving a solid residue of magnesium oxide and calcium oxide. The thermal decomposition of mixtures of these minerals through endothermic release of carbon dioxide and water has led to several studies showing their potential applications, including fire retardant additives for polymer compounds [2,4,[27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46], controlling burning rates in cigarettes [47,48], and as a potential material for fighting forest fires [49][50][51][52][53].…”

Section: Introductionmentioning

confidence: 99%

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The fire retardant effects of huntite in natural mixtures with hydromagnesite

Hollingbery¹,

Hull²

2012

Polymer Degradation and Stability

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The fire retardant effects of natural mixtures of huntite and hydromagnesite have been investigated. As well as being entirely natural these mixtures of minerals can be considered "greener" and more environmentally friendly, in their production methods, than alternatives such as aluminium hydroxide and magnesium hydroxide. It has been shown that the release of water and carbon dioxide from hydromagnesite helps to increase the time to ignition and peak heat release in cone calorimeter testing. Huntite has been shown to decrease the average rate of heat release and increase the strength of the residue. Electron microscopy has shown that the huntite particles maintain their platy morphology during combustion in the cone calorimeter. The morphology of these particles helps to reduce the rate of heat release by slowing the release of flammable decomposition products to the flame. The platy shape of the huntite particles increases the strength of the residue containing higher proportions of this mineral. Huntite is shown to play an active part in improving fire retardancy when used in a mixture with hydromagnesite, giving performance for typical mixtures comparable to those of aluminium hydroxide.

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Section: Effect Of Mineral Ratios On Combustion In the Cone Calorimetermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The fire retardant effects of huntite in natural mixtures with hydromagnesite

Hollingbery¹,

Hull²

2012

Polymer Degradation and Stability

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Responsive Bio‐Composites from Magnesium Carbonate Filled Polycaprolactone and Curcumin‐Functionalized Cellulose Fibers

Quilez‐Molina

Pasquale

Debellis

et al. 2021

Advanced Sustainable Systems

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non-toxicity, low-density, biocompatibility properties, and low cost. [1][2][3][4][5] The main drawback associated with the use of cellulose in specific composites-related applications is its water sensitivity and ability to uptake significant amounts of moisture. [6][7][8] On the other hand, cellulose fibers have very good mechanical properties, and because of this, they have been employed to reinforce many petroleum polyolefins or bio-based resins. [9][10][11] Advances in the development of cellulose nanofibers and bacterial cellulose have led to many new generation cellulose composites with superior mechanical properties and functionality. [12][13][14][15][16] In addition, many different physicochemical methods have also been developed to extract cellulose from agricultural and food wastes including biomass that can potentially reduce deforestation related to cellulose production feedstock. [17][18][19][20] Many sustainable packaging solutions and technologies must guarantee product safety and increase shelf life while decreasing pollution related to nondegrading plastics. It is believed that biobased responsive polymers and composites can address this necessity if accompanying economic and environmental benefits are also demonstrated. This study is motivated by these recent advances. At the same time, recent awareness in reducing environmental plastic pollution has fueled a significant momentum towards using natural polymers Development of responsive bio-based and biodegradable materials is particularly important in food preservation and monitoring technologies. Although replacing conventional plastic products with sustainable alternatives is still a challenge, promising advances have been reported. In this work, the fabrication of responsive bio-composite films from polycaprolactone (PCL) and magnesium carbonate (MgCO 3 ), known as food additive E504 with melt impregnation into cellulose, is reported. Cellulose fibers are stained/coated with ethanoic curcumin solutions, primarily to protect them against oxidative degradation. The films demonstrate a strong antioxidant effect against fatty and aqueous food simulants with improved oxygen gas barrier properties. Interestingly, the natural chelation of curcumin with magnesium within the composites improves the bioavailability and antioxidant potency of curcumin. Moreover, the composites show reversible color change response detectable by the naked eye in basic solutions or vapors. This response is tested by placing the composite film inside a sealed plastic container containing shrimp at room temperature, but not in direct contact. Due to spoilage, a noticeable color change in the bio-composites is recorded. These simple, cost-effective, non-toxic, and paper-like flexible bio-composites can be fabricated on large scale and be used in diverse applications ranging from sustainable packaging to medical applications and freshness indicators.

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Role of Oxygen Defects on the Photocatalytic Properties of Mg‐Doped Mesoporous Ta₃N₅

et al. 2016

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Tantalum nitride (Ta3 N5 ) highlights an intriguing paradigm for converting solar energy into chemical fuels. However, its photocatalytic properties are strongly governed by various intrinsic/extrinsic defects. In this work, we successfully prepared a series of Mg-doped mesoporous Ta3 N5 using a simple method. The photocatalytic and photoelectrochemical properties were investigated from the viewpoint of how defects such as accumulation of oxygen and nitrogen vacancies contribute to the catalytic activity. Our findings suggest that Mg doping is accompanied by an accumulation of oxygen species and a simultaneous elimination of nitrogen vacancies in Ta3 N5 . These oxygen species in Ta3 N5 induce delocalized shallow donor states near the conduction band minimum and are responsible for high electron mobility. The superior photocatalytic activity of Mg-doped Ta3 N5 can then be understood by the improved electron-hole separation as well as the lack of nitrogen vacancies, which often serve as charge-recombination centers.

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The thermal decomposition of natural mixtures of huntite and hydromagnesite

Cited by 62 publications

References 35 publications

The fire retardant effects of huntite in natural mixtures with hydromagnesite

The fire retardant effects of huntite in natural mixtures with hydromagnesite

Responsive Bio‐Composites from Magnesium Carbonate Filled Polycaprolactone and Curcumin‐Functionalized Cellulose Fibers

Role of Oxygen Defects on the Photocatalytic Properties of Mg‐Doped Mesoporous Ta₃N₅

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The thermal decomposition of natural mixtures of huntite and hydromagnesite

Cited by 62 publications

References 35 publications

The fire retardant effects of huntite in natural mixtures with hydromagnesite

The fire retardant effects of huntite in natural mixtures with hydromagnesite

Responsive Bio‐Composites from Magnesium Carbonate Filled Polycaprolactone and Curcumin‐Functionalized Cellulose Fibers

Role of Oxygen Defects on the Photocatalytic Properties of Mg‐Doped Mesoporous Ta3N5

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Role of Oxygen Defects on the Photocatalytic Properties of Mg‐Doped Mesoporous Ta₃N₅