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Суворов, С. А.; Skurikhin, V. V.

doi:10.1023/a:1026312619843

Cited by 89 publications

(27 citation statements)

References 2 publications

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“…Acabam por serem sólidos ácidos muito atraentes com elevada estabilidade térmica superior em comparação com outras argilas semelhantes [14]. Devido a uma grande variedade de composições possíveis, a vermiculita apresenta uma elevada capacidade de troca catiônica (CTC) de 100-150 meq/100 g de argila [15].…”

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Síntese e caracterização de vermiculita mesoporosa obtida por modificação com sais complexos de alumínio e lantânio

Fernandes

Silva

2014

Cerâmica

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Síntese e caracterização de vermiculita mesoporosa obtida por modificação com sais complexos de alumínio e lantânio

Fernandes

Silva

2014

Cerâmica

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“…When the amount of VMT was more than 13 wt%, frontal velocity and T max increased as the VMT content increased from 13 to 21 wt%. This is because that VMT has low bulk density (80–120 kg m −3 ) and low thermal conductivity (0.04–0.12 w (mk) −1 ) , leading to a good insulation effect. When VMT content exceeded 21 wt%, monomer concentration of per unit volume is low and consequently heat released from reaction is less, endothermic effect of VMT is greater than the insulation effect, so the propagating front quenched.…”

Section: Resultsmentioning

confidence: 99%

Frontal polymerization of superabsorbent polymers based on vermiculite with slow release of urea

Yuan

Qiu

et al. 2016

Polymer Engineering & Sci

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Poly(acrylic acid-co-acrylamide)/sodium carboxymethyl cellulose/vermiculite (VMT) superabsorbent polymers (SAPs) were prepared by frontal polymerization (FP), a kind of polymerization model characterized by short reaction times and low-energy consumption. The effects of VMT content and monomer ratios on frontal parameters and water absorbency were investigated. Due to the good heat insulation property of VMT, the propagating front still sustained at high VMT concentrations (over 30%). The preparation of SAPs with high VMT-loading via FP has advantages of low energy consumption and low materials prices, decreasing the cost of SAPs effectively. SAPs with slow-release fertilizer (SSRF) were obtained by embedding urea into their networks during the FP process. The addition of urea not only endows SAPs with slow release function of urea (more than 30 days in soil), but also increases their water absorbency (by 17.4%). The effects of obtained SSRF on tall fescue seeds germination and growth were studied. Compared with the control group, the germination rate and vigor index of tall fescue seeds applied SSRF with 10% urea increased by 17.5 and 80.2%, respectively. POLYM. ENG. SCI., 57:69-77, 2017.

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“…Many applications include the compaction processes of expanded vermiculite or its integration in composite materials. The mechanical properties as well as the apparent density of vermiculite are linked to the particle size [6]. Understanding the relationship between porosity, particle size, mechanical properties and thermal insulating capacity is fundamental for the design of new refractory materials for a wide range of important technological fields such as furnaces, reactors, building, petrochemical and environmental applications.…”

Section: Introductionmentioning

confidence: 99%

Porosity evolution of expanded vermiculite under pressure: the effect of pre-compaction

et al. 2019

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The evolution of the pore structure of compressed expanded vermiculite was investigated in situ under uniaxial stress up to 3200 bar using small-angle neutron and X-ray scattering. The studied samples have a lamellar texture in which the presence of oriented oblate pores was revealed by the anisotropic small-angle scattering patterns. The initial pore size distribution and the mechanical behaviour of the pellets at working pressure conditions are strongly related to the applied initial stresses used to pre-compact the vermiculite powder. Our study shows that the porous structure of the pellets was not modified under compression up to the pre-compaction pressure. Higher densification is associated with increasing anisotropy of the pore-matrix interface structure. The pore-matrix interface could be described with fractal geometry. The stress dependence of the system fractal dimension, apparent specific surface area and total porosity was determined and related to the meso-and macropore evolution under uniaxial stress.

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Cited by 89 publications

References 2 publications

Síntese e caracterização de vermiculita mesoporosa obtida por modificação com sais complexos de alumínio e lantânio

Síntese e caracterização de vermiculita mesoporosa obtida por modificação com sais complexos de alumínio e lantânio

Frontal polymerization of superabsorbent polymers based on vermiculite with slow release of urea

Porosity evolution of expanded vermiculite under pressure: the effect of pre-compaction

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