Influence of interlayer cations on organic intercalation of montmorillonite

Wu, Limei; Liao, Libing; Lv, Guocheng

doi:10.1016/j.jcis.2015.04.021

Cited by 56 publications

(33 citation statements)

References 40 publications

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“…Esses resultados são explicados com base, principalmente, na esfoliação das argilas aditivadas, explicada anteriormente (Tabela V), e nas características físico-químicas dos cátions envolvidos, como por exemplo o tamanho de seus raios atômicos, características individuais de cada um, dentre outros, como são detalhados na introdução, reforçando afirmações [44,45] da relação da distribuição granulométrica (Tabela III), cujo efeito do tamanho de partículas das argilas está relacionado com a viscosidade [53]. Estudos anteriores [24][25][26][27] mostraram que o tipo de cátion pode afetar o processo de intercalação por terem comportamentos de hidratação e intercalação diferentes com as camadas estruturais da bentonita, nas quais a força entre o cátion e a ligação de água diminui à medida que se aumenta o raio do cátion; isto significa que o Li + e o Na + têm força vinculativa com a água maior que o K + , hidratando-se mais. Analisando a Fig.…”

Section: Resultsunclassified

“…Por isso esse elétron pode ser removido com facilidade de modo que pode ser separado a partir do oxigênio do silício tetraedral da superfície da bentonita, devido a fracas forças iônicas e forças de van der Waals. Por outro lado, o K + permanece ligado à superfície dos tetraedros de oxigênio e silício [24,26]. Além disso, mesmo em pequenas quantidades, estes cátions podem controlar a capacidade total de sorção do sistema [25,27].…”

Section: Introductionunclassified

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Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

et al. 2018

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ResumoOs cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) encontram-se em primeiro lugar no plano de seletividade para a obtenção de bentonitas monocatiônicas a partir das policatiônicas, influenciando de forma específica o comportamento reológico dos fluidos de perfuração base água. O objetivo deste trabalho foi estudar a influência do Li + , Na + e K + na reologia de bentonitas do estado da Paraíba, Brasil, para uso em fluidos de perfuração à base de água. Os novos depósitos de bentonitas brasileiras foram comparados com base nas suas características químicas, físicas, mineralógicas, propriedades reológicas e de filtração. As amostras de bentonitas foram caracterizadas por meio da composição química através do método clássico, capacidade de troca de cátions, análise granulométrica por difração a laser, difração de raios X e análises térmicas. A reologia das dispersões foi estudada e determinadas as viscosidades aparente, viscosidade plástica e limite de escoamento com base nas normas da API e Petrobras, além dos estudos de inchamento em água e filtrado. Os resultados mostraram uma melhora significativa nas propriedades reológicas e de filtração das dispersões após a aditivação com os carbonatos de lítio e de sódio, nessa ordem, havendo presença de tixotropia nas curvas de fluxo das dispersões de argilas estudadas. Palavras-chave: bentonitas, carbonatos alcalinos, fluidos de perfuração. Abstract

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Section: Resultsunclassified

Section: Introductionunclassified

Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

et al. 2018

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“…Because of its large specific surface area (SSA), low cost, high cation exchange capacity (CEC), and good swelling Mg 0.36 ) 2.00 [(Si 3.98 Al 0.02 ) 4.00 O 10 ](OH) 2 } and (Na 0.03 Ca 0.29 K 0.04 Mg 0.02 ) 0.69 ·{(Al 1. 27 Fe 0.04 Ti 0.03 Mg 0.66 ) 2.00 [(Si 3.94 Al 0.06 ) 4.00 O 10 ](OH) 2 }, and their corresponding layer charge density is 0.38 and 0.69, respectively. In order to improve the dispersity of Ca-MT in water, both of them were sodium-modified by Na 2 CO 3 of 4.0% (wt %) for 1.0 h at room temperature, dehydrated by centrifugation in the centrifugal machine (TD5A-WS, Jiangsu Jintan Instrument Factory, Jintan, China), dried in the oven (302, Shandong Longkou Xianke Instrument Co., Ltd., Longkou, China) at 80.0 • C for 24.0 h, and then ground to less than 200 mesh by vibrating grinder (XZM-100, Wuhan Prospecting Machinery Factory, Wuhan, China).…”

Section: Introductionmentioning

confidence: 99%

“…Similar rules were also verified by other investigators [24][25][26].Moreover, layer charge density of MT, type of interlayer cation, modification condition, and so on can also influence the structure and property of organo-MT. Wu et al and Chen et al studied the influence of type of interlayer cation on organic intercalation of MT, and they found that, the weaker the electrostatic attraction between interlayer cation and MT sheets, the easier the organic intercalation of surfactant into MT layers [11,27]. Peng et al studied the effect of pH on the adsorption of dodecyl amine (DDA) on MT surfaces in aqueous solution and found that the hydrophobicity of DDA-MT was the best when the pH of aqueous solution is 8.0 [28].Although large amounts of works on the organic modification of MT have been done, but to our knowledge, there is no systemic comparative study about the effect of layer charge density of Na-MT and carbon chain length of alkyl ammonium on the structure and gel property of organo-MT.…”

mentioning

confidence: 99%

“…Moreover, layer charge density of MT, type of interlayer cation, modification condition, and so on can also influence the structure and property of organo-MT. Wu et al and Chen et al studied the influence of type of interlayer cation on organic intercalation of MT, and they found that, the weaker the electrostatic attraction between interlayer cation and MT sheets, the easier the organic intercalation of surfactant into MT layers [11,27]. Peng et al studied the effect of pH on the adsorption of dodecyl amine (DDA) on MT surfaces in aqueous solution and found that the hydrophobicity of DDA-MT was the best when the pH of aqueous solution is 8.0 [28].…”

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confidence: 99%

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Comprehensive Characterization of the Structure and Gel Property of Organo-Montmorillonite: Effect of Layer Charge Density of Montmorillonite and Carbon Chain Length of Alkyl Ammonium

et al. 2020

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In this work, the effect of layer charge density of Na-montmorillonite (Na-MT) and carbon chain length of alkyl ammonium on the structure and gel property of organo-montmorillonite (organo-MT) was studied by using X-ray diffraction (XRD), Fourier transform infrared (FTIR), thermogravimetric (TG) analysis, contact angle test, molecular dynamics (MD) simulation, and gel apparent viscosity determination experiment. The results of XRD show that Na-MT with lower layer charge density is easier to swell after intercalation of alkyl ammonium, and the basal spacing of organo-MT increases with the increase of carbon chain length. The results of FTIR show that the absorption bands at 2924 cm −1 and 2853 cm −1 shift towards low frequency region with the increase of carbon chain length, and the absorption bands at 515 cm −1 and 463 cm −1 move towards high frequency region when the layer charge density increases. The mass loss of organo-MT evidently increases with the increase of layer charge density of Na-MT or carbon chain length of alkyl ammonium. The contact angle test results are well in line with the TG data and reveal that alkyl ammonium with longer carbon chain can significantly improve the hydrophobicity of organo-MT. MD simulation indicates that, when the layer charge density is low, the distribution of alkyl ammonium gradually changes from parallel double layers to partially inclined distribution with the increase of carbon chain length, but when the layer charge density is high, the distribution of alkyl ammonium gradually changes from three layers into four layers. The test results of the apparent viscosity of the gel formed by organo-MT in xylene show that the apparent viscosity of organo-MT gel is negatively correlated with the layer charge density of Na-MT and positively correlated with the carbon chain length of alkyl ammonium. ability in aqueous solution, MT has attracted wide attention both in academia and in industry [3][4][5][6]. The occurrence of non-equivalent isomorphic substitution of Al 3+ for Si 4+ in the tetrahedral sheets and Mg 2+ for Al 3+ in the octahedral layers makes MT layers negatively charged [7]. To balance the negative layer charge density of MT, some hydrophilic exchangeable cations, such as Na + , K + , and Ca 2+ , are usually attracted into the interlayer domain, and due to the hydration of inorganic cation [8,9], confined basal spacing, and high surface energy, natural MT performs badly in organic phase environment [6,10].In order to expand the application of MT in industry, organo-MT is synthesized by intercalating surfactant into interlayer space of natural MT [11]. In this way, interlayer distance of MT obviously increase and new sorption sites can be formed [12], besides, inorganic cation can be exchanged by surfactant, which results in that the surface property of MT converts from hydrophilic to hydrophobic. As a result, the organo-MT can be applied in many fields, such as polymer MT nanocomposite [13,14], adsorbent for organic contaminant [15,16], oil-based drilling fluid [17], ...

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Multifunctional Nanoclay‐Based Hemostatic Materials for Wound Healing: A Review

Tan,

Yang,

Zheng

et al. 2023

Adv Healthcare Materials

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Bleeding to death accounts for around 30–40% of all trauma‐related fatalities. Current hemostatic materials are mainly mono‐functional or have insufficient hemostatic capacity. Nanoclay has been recently shown to accelerate hemostasis, improve wound healing, and provide the resulting multifunctional hemostatic materials antibacterial, anti‐inflammatory, and healing‐promoting due to its distinctive morphological structure and physicochemical properties. Herein, the chemical design and action mechanism of nanoclay‐based hemostatic, antibacterial, and pro‐wound healing materials in the context of wound healing are discussed. The physiological processes of hemostasis and wound healing to elucidate the significance of nanoclay for functional wound hemostatic dressing design are outlined. A summary of the features of various nanoclay and product types used in wound hemostatic dressings is provided. Nanoclay can be antimicrobial due to the slow release of metal ions and has an abundant surface charge allowing for high affinity for proteins and cells, which can activate the coagulation reaction or facilitate tissue repair. Nanoclay with a microporous structure can be used as drug carriers to create composites critical for inhibiting bacterial growth on wounds or promoting the regeneration of vascular, muscle, and skin tissues. Directions for further research and innovation of nanoclay‐based multifunctional materials for hemostasis and tissue regeneration are explored.

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Influence of interlayer cations on organic intercalation of montmorillonite

Cited by 56 publications

References 40 publications

Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

Influência dos cátions lítio (Li + ), sódio (Na + ) e potássio (K + ) na reologia de bentonitas brasileiras para uso em fluidos de perfuração base aquosa

Comprehensive Characterization of the Structure and Gel Property of Organo-Montmorillonite: Effect of Layer Charge Density of Montmorillonite and Carbon Chain Length of Alkyl Ammonium

Multifunctional Nanoclay‐Based Hemostatic Materials for Wound Healing: A Review

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