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Influence of Organic-Modified Inorganic Matrices on the Optical Properties of Palygorskite–Curcumin-Type Hybrid Materials. CRYSTALS 2022. [DOI: 10.3390/cryst12071005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Clays are very important from an economic and application point of view, as they are suitable hosts for organic compounds. In order to diversify the fields of application, they are structurally modified by physical or chemical methods with cationic species, and/or different bifunctional compounds, such as organosilanes. In this study, palygorskite was modified with (3-Aminopropyl) triethoxysilane, which was subsequently modified at the amino group by grafting an acetate residue. By using this strategy, two types of host hybrid materials were obtained on which curcumin derivatives were deposited. The composites obtained were structurally characterized and their photophysical properties were investigated in relation to the structure of the host matrices and interactions with curcumin-type visiting species. The hybrid composites have different colors (orange, yellow, pink), depending on the polarity of the inorganic matrices modulated by different organic groups grafted at the surface. Fluorescence emission in the visible range is characterized by the presence of two emission maxima, one belonging to the chromophore and the other influenced by the physical interactions between auxochromes and host matrices. These hybrid materials, compared to other composite structures, are obtained by a simple adsorption process. They are temperature stable in aggressive environments (acid/base) and render the fluorescent properties of dyes redundant, with improved luminescent performance compared to them.
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Huang X, Wu W. Novel preparation of attapulgite-reduced graphene oxide hydrogel composite and its application in flexible solid-state supercapacitors. NANOTECHNOLOGY 2022; 33:205704. [PMID: 35078160 DOI: 10.1088/1361-6528/ac4eb3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Accepted: 01/24/2022] [Indexed: 06/14/2023]
Abstract
After graphite oxide assisted the liquid phase shear exfoliation of attapulgite, the good dissociation and dispersion of attapulgite rod crystals are realized. Due to the spatial hindrance effect of attapulgite, which prevents the stacking of RGO sheets, the attapulgite-reduced graphene oxide three-dimensional porous hydrogel with abundant pore structure enables rapid transfer of electrolyte ions and exhibits good electrochemical performance and rate performance. The assembled flexible solid-state supercapacitor has a high operating voltage window and good flexibility and cycle stability. At a current density of 0.1 mA cm-2, it has an area specific capacitance of 127.33 mF cm-2. A series of solid-state supercapacitors can be used as the power supply for LED lights.
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Affiliation(s)
- Xiaohui Huang
- School of Environment and Chemical Engineering, Heilongjiang University of Science and Technology, People's Republic of China
- Research Center of the Ministry of Education for High Gravity of Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
| | - Wei Wu
- Research Center of the Ministry of Education for High Gravity of Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, People's Republic of China
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Ruiz-Hitzky E, Ruiz-García C, Fernandes FM, Lo Dico G, Lisuzzo L, Prevot V, Darder M, Aranda P. Sepiolite-Hydrogels: Synthesis by Ultrasound Irradiation and Their Use for the Preparation of Functional Clay-Based Nanoarchitectured Materials. Front Chem 2021; 9:733105. [PMID: 34485248 PMCID: PMC8414812 DOI: 10.3389/fchem.2021.733105] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 08/02/2021] [Indexed: 12/18/2022] Open
Abstract
Sepiolite and palygorskite fibrous clay minerals are 1D silicates featuring unique textural and structural characteristics useful in diverse applications, and in particular as rheological additives. Here we report on the ability of grinded sepiolite to generate highly viscous and stable hydrogels by sonomechanical irradiation (ultrasounds). Adequate drying of such hydrogels leads to low-density xerogels that show extensive fiber disaggregation compared to the starting sepiolite—whose fibers are agglomerated as bundles. Upon re-dispersion in water under high-speed shear, these xerogels show comparable rheological properties to commercially available defibrillated sepiolite products, resulting in high viscosity hydrogels that minimize syneresis. These colloidal systems are thus very interesting as they can be used to stabilize many diverse compounds as well as nano-/micro-particles, leading to the production of a large variety of composites and nano/micro-architectured solids. In this context, we report here various examples showing how colloidal routes based on sepiolite hydrogels can be used to obtain new heterostructured functional materials, based on their assembly to solids of diverse topology and composition such as 2D and 1D kaolinite and halloysite aluminosilicates, as well as to the 2D synthetic Mg,Al-layered double hydroxides (LDH).
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Affiliation(s)
| | - Cristina Ruiz-García
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.,Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT), Madrid, Spain
| | - Francisco M Fernandes
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.,Laboratoire de Chimie de la Matière Condensée de Paris, Faculté de Sciences, Sorbonne Université, Paris, France
| | - Giulia Lo Dico
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.,IMDEA Materials Institute, Getafe, Spain
| | - Lorenzo Lisuzzo
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.,Dipartimento di Fisica e Chimica - Emilio Segrè, Università degli Studi di Palermo, Palermo, Italy
| | - Vanessa Prevot
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain.,Université Clermont Auvergne, CNRS, ICCF, Clermont-Ferrand, France
| | - Margarita Darder
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain
| | - Pilar Aranda
- Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Madrid, Spain
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Comparison of Surface Properties of Sepiolite and Palygorskite: Surface Energy and Nanoroughness. NANOMATERIALS 2021; 11:nano11061579. [PMID: 34208459 PMCID: PMC8235428 DOI: 10.3390/nano11061579] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/07/2021] [Revised: 05/14/2021] [Accepted: 06/10/2021] [Indexed: 11/16/2022]
Abstract
The surface properties of two sepiolite samples and one palygorskite sample were compared using inverse gas chromatography (IGC). Samples were previously conditioned at appropriate temperatures for the removal of all zeolitic water. Dispersive (or Lifshitz–van der Waals) component of the surface energy (γsd), specific interactions (−ΔGas) with π electron donor bases (1-alkenes), and nanomorphology indices (IMχT) based on the injections of cycloalkanes and a branched alkane were measured. From IGC data, at 240 °C, it was found that the palygorskite was clearly distinguished from the sepiolites. The palygorskite possessed a lower γsd, larger −ΔGas with 1-alkenes, and remarkably higher IMχT. Slight differences could also be observed between the two sepiolite samples with the same origin. The results were rationalized in terms of the structural features of the two studied minerals. The larger channels of the sepiolite allow for a better insertion of the n-alkanes (longer retention times) while excluding the bulkier probes, such as cyclooctane or 2,2,4-trimethylpentane. Accordingly, the corresponding γsd values were larger and the IMχT values were lower (higher surface nanoroughness) for the sepiolites. Regarding Lewis acid–base properties, all the sample’s surfaces evidenced a very strong amphoteric character. The present results highlight the potential of the evaluated samples for, e.g., adsorption processes with volatile organic compounds or matrix–filler interactions regarding the production of composite structures with Lewis acid–base matrices.
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