Relevant bibliographies by topics / Liquid phase exfoliation (LPE)

Academic literature on the topic 'Liquid phase exfoliation (LPE)'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Liquid phase exfoliation (LPE)"

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Xu, Yanyan, Huizhe Cao, Yanqin Xue, Biao Li, and Weihua Cai. "Liquid-Phase Exfoliation of Graphene: An Overview on Exfoliation Media, Techniques, and Challenges." Nanomaterials 8, no. 11 (November 15, 2018): 942. http://dx.doi.org/10.3390/nano8110942.

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Graphene, a two-dimensional (2D) carbon nanomaterial, has attracted worldwide attention owing to its fascinating properties. One of critical bottlenecks on some important classes of applications, such as printed electronics, conductive coatings, and composite fillers, is the lack of industrial-scale methods to produce high-quality graphene in the form of liquid suspensions, inks, or dispersions. Since 2008, when liquid-phase exfoliation (LPE) of graphene via sonication was initiated, huge progress has been made in the past decade. This review highlights the latest progress on the successful preparation of graphene in various media, including organic solvents, ionic liquids, water/polymer or surfactant solutions, and some other green dispersants. The techniques of LPE, namely sonication, high-shear mixing, and microfluidization are reviewed subsequently. Moreover, several typical devices of high-shear mixing and exfoliation mechanisms are introduced in detail. Finally, we give perspectives on future research directions for the development of green exfoliation media and efficient techniques for producing high-quality graphene. This systematic exploratory study of LPE will potentially pave the way for the scalable production of graphene, which can be also applied to produce other 2D layered materials, such as BN, MoS2, WS2, etc.
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Aitzhanov, Madi, Nazim Guseinov, Renata Nemkayeva, Yerulan Sagidolda, Zhandos Tolepov, Oleg Prikhodko, and Yerzhan Mukhametkarimov. "Growth and Liquid-Phase Exfoliation of GaSe1−xSx Crystals." Materials 15, no. 20 (October 12, 2022): 7080. http://dx.doi.org/10.3390/ma15207080.

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In recent years, interest in the liquid-phase exfoliation (LPE) of layered crystals has been growing due to the efficiency and scalability of the method, as well as the wide range of practical applications of the obtained dispersions based on two-dimensional flakes. In this paper, we present a comparative study of as-grown and liquid-phase exfoliated GaSe1−xSx flakes. Bulk GaSe1−xSx crystals with x ~ 0, 0.25, 0.5, 0.75, 1 were synthesized by melting stoichiometric amounts of gallium, selenium, and sulfur particles in evacuated ampoules. X-ray diffraction analysis showed that the crystal structure does not change considerably after LPE, while the analysis of the Raman spectra revealed that, after liquid-phase processing in IPA, an additional peak associated with amorphous selenium is observed in selenium-rich GaSeS compounds. Nevertheless, the direct and indirect transition energies determined from the Kubelka-Munk function for LPE crystals correlate with the band gap of the as-grown bulk GaSeS crystals. This finding is also confirmed by comparison with the data on the positions of the photoluminescence peak.
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Xie, Zhongjian, Ruitao Lu, Yao Zhu, Minhua Peng, Taojian Fan, Peigen Ren, Bing Wang, et al. "Liquid-phase exfoliation of black sesame to create a nanoplatform for in vitro photoluminescence and photothermal therapy." Nanomedicine 15, no. 21 (September 2020): 2041–52. http://dx.doi.org/10.2217/nnm-2020-0151.

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Aim: The present study aims to apply the facile liquid-phase exfoliation (LPE) strategy to fabricate 2D organic materials and thus to broaden the family of biocompatible and multifunctional 2D materials. Materials & methods: 2D material-organic melanin and cellulose nanosheets were synthesized from black sesame hull using LPE. Photoluminescence and photothermal properties of the nanosheets were assessed, as well as stability and cell killing ability. Results: The prepared 2D nanoplatform exhibited broad and multiple photoluminescent emission bands. It also demonstrated efficient photothermal cancer therapy with excellent biocompatibility. Conclusion: The present study could open an avenue in exfoliating organic materials using the LPE strategy. This could make the fabrication of multifunctional 2D organic materials more efficient and broaden the family of biocompatible 2D nanomaterials.
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Sousa, Samuel M., Helane L. O. Morais, Joyce C. C. Santos, Ana Paula M. Barboza, Bernardo R. A. Neves, Elisângela S. Pinto, and Mariana C. Prado. "Liquid phase exfoliation of talc: effect of the medium on flake size and shape." Beilstein Journal of Nanotechnology 14 (January 9, 2023): 68–78. http://dx.doi.org/10.3762/bjnano.14.8.

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Industrial applications of nanomaterials require large-scale production methods, such as liquid phase exfoliation (LPE). Regarding this, it is imperative to characterize the obtained materials to tailor parameters such as exfoliation medium, duration, and mechanical energy source to the desired applications. This work presents results of statistical analyses of talc flakes obtained by LPE in four different media. Talc is a phyllosilicate that can be exfoliated into nanoflakes with great mechanical properties. Sodium cholate at two different concentrations (below and at the critical micelar concentration), butanone, and Triton-X100 were employed as exfoliation medium for talc. Using recent published statistical analysis methods based on atomic force microscopy images of thousands of flakes, the shape and size distribution of nanotalc obtained using the four different media are compared. This comparison highlights the strengths and weaknesses of the media tested and hopefully will facilitate the choice of the medium for applications that have specific requirements.
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Goni, Freskida, Angela Chemelli, and Frank Uhlig. "High-Yield Production of Selected 2D Materials by Understanding Their Sonication-Assisted Liquid-Phase Exfoliation." Nanomaterials 11, no. 12 (November 30, 2021): 3253. http://dx.doi.org/10.3390/nano11123253.

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Liquid-phase exfoliation (LPE) is a widely used and promising method for the production of 2D nanomaterials because it can be scaled up relatively easily. Nevertheless, the yields achieved by this process are still low, ranging between 2% and 5%, which makes the large-scale production of these materials difficult. In this report, we investigate the cause of these low yields by examining the sonication-assisted LPE of graphene, boron nitride nanosheets (BNNSs), and molybdenum disulfide nanosheets (MoS2 NS). Our results show that the low yields are caused by an equilibrium that is formed between the exfoliated nanosheets and the flocculated ones during the sonication process. This study provides an understanding of this behaviour, which prevents further exfoliation of nanosheets. By avoiding this equilibrium, we were able to increase the total yields of graphene, BNNSs, and MoS2 NS up to 14%, 44%, and 29%, respectively. Here, we demonstrate a modified LPE process that leads to the high-yield production of 2D nanomaterials.
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Martín-Pérez, Lucía, and Enrique Burzurí. "Optimized Liquid-Phase Exfoliation of Magnetic van der Waals Heterostructures: Towards the Single Layer and Deterministic Fabrication of Devices." Molecules 26, no. 23 (December 4, 2021): 7371. http://dx.doi.org/10.3390/molecules26237371.

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Van der Waals magnetic materials are promising candidates for spintronics and testbeds for exotic magnetic phenomena in low dimensions. The two-dimensional (2D) limit in these materials is typically reached by mechanically breaking the van der Waals interactions between layers. Alternative approaches to producing large amounts of flakes rely on wet methods such as liquid-phase exfoliation (LPE). Here, we report an optimized route for obtaining monolayers of magnetic cylindrite by LPE. We show that the selection of exfoliation times is the determining factor in producing a statistically significant amount of monolayers while keeping relatively big flake areas (~1 µm2). We show that the cylindrite lattice is preserved in the flakes after LPE. To study the electron transport properties, we have fabricated field-effect transistors based on LPE cylindrite. Flakes are deterministically positioned between nanoscale electrodes by dielectrophoresis. We show that dielectrophoresis can selectively move the larger flakes into the devices. Cylindrite nanoscale flakes present a p-doped semiconducting behaviour, in agreement with the mechanically exfoliated counterparts. Alternating current (AC) admittance spectroscopy sheds light on the role played by potential barriers between different flakes in terms of electron transport properties. The present large-scale exfoliation and device fabrication strategy can be extrapolated to other families of magnetic materials.
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Arao, Yoshihiko, Jonathon D. Tanks, Kojiro Aida, and Masatoshi Kubouchi. "Exfoliation Behavior of Large Anionic Graphite Flakes in Liquid Produced by Salt-Assisted Ball Milling." Processes 8, no. 1 (December 24, 2019): 28. http://dx.doi.org/10.3390/pr8010028.

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Functionalization of graphite is crucial for efficient and effective exfoliation to graphene. When negative charges are fixed to the edges of natural graphite, the resulting anionic graphite shows negative charging in a polar solvent. This enhanced negative charging is assumed to contribute the exfoliation of graphite during liquid-phase exfoliation (LPE). In this study, we prepared large anionic graphite flakes (~10 μm) by salt-assisted ball milling, as well as natural graphite flakes of the same size for comparison. During the LPE process, centrifugation speed and solvent type have dominant effects on graphene concentration and quality (e.g., size and thickness), so we investigated these factors for anionic graphite flakes in detail. The anionic graphite showed higher exfoliation efficiency in every type of solvent (isopropanol, methyl ethyl ketone, acetone, and water-based cosolvent) compared with the natural graphite. Monolayer graphene, with an average size of 80–200 nm, was obtained with relatively high yield (>10%) at only 3 min of sonication. The small size of graphene was due to edge fragmentation during the LPE process. The recyclability of the sediment and the characterization of the exfoliated powders for anionic graphene were also investigated.
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Shu, Kewei, Siyu Tian, Yu Wang, Guiqiang Fei, Liyu Sun, Huizhu Niu, Yihao Duan, Guangyu Hu, and Haihua Wang. "Graphene Composite via Bacterial Cellulose Assisted Liquid Phase Exfoliation for Sodium-Ion Batteries." Polymers 15, no. 1 (December 31, 2022): 203. http://dx.doi.org/10.3390/polym15010203.

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One of the most critical challenges for commercialization of sodium-ion battery (SIB) is to develop carbon anodes with high capacity and good rate performance. Graphene would be an excellent SIB anode candidate due to its success in various kinds of batteries. Liquid-phase exfoliation (LPE) method is an inexpensive, facile and potentially scalable method to produce less-defected graphene sheets. In this work, we developed an improved, dispersant-assisted LPE method to produce graphene composite materials from raw graphite with high yield and better quality for SIB anode. Here, bacterial cellulose (BC) was used as a green dispersant/stabilizer for LPE, a “spacer” for anti-restacking, as well as a carbon precursor in the composite. As a result, the carbonized BC (CBC)/LPE graphene (LEGr) presented improved performance compared to composite with graphene prepared by Hummers method. It exhibited a specific capacity of 233 mAh g−1 at a current density of 20 mA g−1, and 157 mAh g−1 after 200 cycles at a high current density of 100 mA g−1 with capacity retention rate of 87.73%. This method not only provides new insight in graphene composites preparation, but also takes a new step in the exploration of anode materials for sodium-ion batteriesSIBs.
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Ott, Steffen, Melanie Lakmann, and Claudia Backes. "Impact of Pretreatment of the Bulk Starting Material on the Efficiency of Liquid Phase Exfoliation of WS2." Nanomaterials 11, no. 5 (April 22, 2021): 1072. http://dx.doi.org/10.3390/nano11051072.

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Liquid phase exfoliation (LPE) is widely used to produce colloidal dispersions of nanomaterials, in particular two-dimensional nanosheets. The degree of exfoliation, i.e., the length to thickness aspect ratio was shown to be intrinsically limited by the ratio of in-plane to out-of-plane binding strength. In this work, we investigate whether simple pretreatment of the starting material can be used to change the in-plane to out-of-plane binding strength through mild intercalation to improve the sample quality in sonication-assisted LPE. Five different pretreatment conditions of WS2 were tested and the dispersions size-selected through centrifugation. From optical spectroscopy (extinction, Raman, photoluminescence), information on nanosheet dimension (average lateral size, layer number, monolayer size) and optical quality (relative photoluminescence quantum yield) was extracted. We find that the pretreatment has a minor impact on the length/thickness aspect ratio, but that photoluminescence quantum yield can be increased in particular using mild sonication conditions. We attribute this to the successful exfoliation of nanosheets with a lower degree of basal plane defectiveness. This work emphasizes the complexity of the exfoliation process and suggests that the role of defects has to be considered for a comprehensive picture.
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Al-Dulaimi, Naktal, Edward A. Lewis, David J. Lewis, Simon K. Howell, Sarah J. Haigh, and Paul O'Brien. "Sequential bottom-up and top-down processing for the synthesis of transition metal dichalcogenide nanosheets: the case of rhenium disulfide (ReS2)." Chemical Communications 52, no. 50 (2016): 7878–81. http://dx.doi.org/10.1039/c6cc03316d.

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Bottom-up (aerosol-assisted chemical vapor deposition, AACVD) and top-down (liquid phase exfoliation, LPE) processing methodologies are used in tandem to produce colloids of few-layer thick rhenium disulfide (ReS2) in N-methyl pyrrolidone.
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Dissertations / Theses on the topic "Liquid phase exfoliation (LPE)"

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Eredia, Matilde. "2D materials : exfoliation in liquid-phase and electronics applications." Thesis, Strasbourg, 2019. http://www.theses.fr/2019STRAF008/document.

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Cette thèse est consacrée à la production de matériaux 2D en phase liquide, en utilisant des approches pouvant permettre la production en masse de graphène et de matériaux apparentés. Notre objectif est de surmonter certains problèmes critiques pour le traitement et l'utilisation pratique des encres à base de matériaux 2D et de fournir une compréhension approfondie de la relation structure-propriétés dans ces matériaux, constituant des étapes obligatoires pour leurs applications futures. Cette thèse porte principalement sur l'UILPE et l'exfoliation électrochimique du graphène et du disulfure de molybdène (MoS2), qui ont été choisis comme matériaux prototypes à 2 dimensions. Les approches synthétiques sont combinées à une caractérisation physico-chimique des matériaux produits, à l'aide de techniques telles que l'AFM, la microscopie électronique, la spectroscopie XPS et Raman, ainsi qu'à une caractérisation électrique. Des applications dans le domaine de la détection et de l'électronique ont été explorées et ont permis de démontrer que des approches d'exfoliation en phase liquide pouvaient être utilisées pour obtenir un contrôle précis des propriétés des matériaux 2D ouvrant la voie à leur intégration en tant que matériaux actifs dans de nouveaux dispositifs multifonctionnels
This thesis is devoted to the production in liquid-phase of two-dimensional materials, by using approaches that may enable mass production of graphene and related materials. We aim to overcome some issues that are critical for the processing and practical use of 2D materials-inks and to provide a deep understanding of the structure-properties relationship in such materials being mandatory steps toward their future applications. This thesis mainly focuses on ultrasound-induced liquid-phase exfoliation and electrochemical exfoliation of graphene and molybdenum disulfide, which have been chosen as prototypical 2D materials. The synthetic approaches have been combined with a multiscale physico-chemical and electrical characterization of the produced materials, by employing techniques such as AFM, XPS and Raman spectroscopy. Applications in the field of sensing and electronics have been explored and allowed to demonstrate that liquid-phase exfoliation approaches can be conveniently employed to achieve a fine control on the properties of 2D materials paving the way to their integration as active materials in novel multifunctional devices
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Winchester, Andrew. "LIQUID PHASE EXFOLIATION OF 2D LAYERED MATERIALS AND THEIR APPLICATION." OpenSIUC, 2014. https://opensiuc.lib.siu.edu/theses/1417.

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In this work, several materials possessing a layered structure were investigated using a technique of exfoliation in liquid phase to produce few- to mono-layers of the material. Materials exfoliated in such a way included graphite, boron nitride, molybdenum disulfide and tungsten disulfide. Subsequent transmission electron microscopy and accompanying electron diffraction patterns revealed that few and mono layer forms of these materials have been realized through this exfoliation method. Ultraviolet-visible spectroscopy confirmed the shifting of the band gaps in molybdenum and tungsten disulfides that is predicted in reducing the number of layers of these materials and was also used to confirm the band gap of the boron nitride. As a potential application, exfoliated molybdenum disulfide was used in the construction of electrodes for electrical charge storage in an electrochemical double layer capacitor, or supercapacitor, style device. Cyclic voltammetry, galvanostatic charge discharge, and electrochemical impedance spectroscopy measurements were performed using three different electrolytes, which showed good capacitive behavior for these devices. Using the data from electrochemical impedance spectroscopy, equivalent circuit models were generated to represent the systems in different electrolytes. From this, it was determined that the capacitive behavior of these systems was partially diffusion limited.
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Knick, Cory. "Modeling the Exfoliation Rate of Graphene Nanoplatelet Production and Application for Hydrogen Storage." Wright State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=wright1347767528.

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Synnatschke, Kevin [Verfasser], and Claudia [Akademischer Betreuer] Backes. "Liquid phase exfoliation and size dependent properties of van der Waals crystals / Kevin Synnatschke ; Betreuer: Claudia Backes." Heidelberg : Universitätsbibliothek Heidelberg, 2021. http://d-nb.info/1229695400/34.

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Haar, Sébastien. "Supramolecular approaches to graphene : generation of functional hybrid assemblies." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAF040/document.

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Cette thèse démontre le potentiel dont dispose l’exfoliation en phase liquide du graphite dans le but d’obtenir des feuillets de graphène dispersés dans un solvant organique. Ainsi le mécanisme d’exfoliation a été étudié en profondeur, en particulier, l’influence de plusieurs paramètres (température, puissance et solvants). Le choix de ses paramètres se montre crucial dans le contrôle du procédé, et pour l’obtention des feuillets de graphène ayant une taille ciblée. Il est donc possible de fabriquer des nano-feuillets de quelques dizaines de nanomètre qui en plus possèdent des propriétés de photoluminescence.Dans le but de comprendre le mécanisme d’exfoliation en phase liquide assistée par des molécules, une nouvelle approche a été mise au point : l’approche supramoléculaire. Cette approche se base sur l’utilisation de surfactants d’un nouveau type. En effet, les molécules sélectionnées possèdent une longue chaine alkyle. Cette chaine s’adsorbe sur la surface du graphène et permet de stabiliser les feuillets lors de l’exfoliation. L’influence de la taille de la chaine alkyle de ces molécules lors de l’exfoliation a été vérifiée. De plus, ces molécules ont été équipées de différentes fonctions supramoléculaires afin qu’elles puissent former des dimères sur la surface du graphène. L’ajout de ces molécules augmente non seulement le rendement d’exfoliation mais aussi le nombre de mono-feuillets présents dans ces dispersions. Ces dispersions présentent des propriétés conductrices lorsqu’elles sont déposées sur des substrats. Une nouvelles méthode de déposition a été mise au point afin d’améliorer et d’augmenter la conductivité mais aussi le pourcentage de transparence
This thesis demonstrates the potential of exfoliation of the graphite in the liquid phase in order to obtain graphene sheets dispersed in an organic solvent. Thus the exfoliation mechanism has been studied, in particular, the influence of several parameters (temperature, power and solvents). The choice of parameters is actually crucial for the control of the process, and to obtain graphene sheets having a targeted size. It is therefore possible to manufacture nanosheets of several tens of nanometers, which in addition exhibit photoluminescence properties.In order to understand the exfoliation mechanism in liquid phase assisted by molecules, a new approach has been developed: the supramolecular approach. This approach is based on using a new type of surfactant. Indeed, the selected molecules carry a long alkyl chain. This chain is adsorbed on the surface of graphene and can stabilize the sheets during exfoliation. The influence of the size of the alkyl chain of these molecules during exfoliation was verified. Furthermore, these molecules have been equipped with various supramolecular functions, which can form dimers on the surface of graphene. The addition of these molecules not only increases exfoliation performance but also the number of mono-layers present in these dispersions. These dispersions have conductive properties when deposited on substrates. A new deposition method was developed to enhance and increase conductivity but also the percentage of transparency
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Aranga, Raju Arun Prakash. "Production and applications of graphene and its composites." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/production-and-applications-of-graphene-and-its-composites(f9000ac1-84ad-41e3-872b-4d7afc80a509).html.

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Graphene, a single layer of graphite, owing to its excellent mechanical, electrical, and thermal properties, has evolved as an exceptional nanomaterial in the past decade. It holds great promise in developing various novel applications from biomedical to structural composites. However, several challenges remain in realising the great potential of this material; one being the bulk scale production of graphene. This thesis has been concerned with production of pristine few-layer graphene (FLG) using liquid phase exfoliation (LPE) of graphite in various solvent media and exploring the applications of graphene-based composite coatings as optical Raman-strain sensors. LPE of natural graphite using bath sonication was used to produce highly stable pristine FLG in 1-methyl-2-pyrrolidinone (NMP) and N,N-dimethylformamide (DMF). Atomic force microscope (AFM) was used to analyse the exfoliation efficiency and lateral dimensions, while Raman spectroscopy provided an insight about the quality of the graphene flakes. Moreover, the potential for dynamic light scattering (DLS) as an efficient in situ characterisation technique for estimating the lateral dimensions of graphene flakes in dispersions was demonstrated. LPE was also employed to explore various routes to produce pristine graphene in aqueous media which can be used for toxicity studies. Aqueous dispersions were prepared by a solvent exchange method of graphene originally in organic solvents (NMP and DMF) using dialysis, achieving 0.1 v/v% organic solvent levels. Pristine aqueous graphene dispersions were also prepared by directly exfoliating graphite in biocompatible surfactant (TDOC- Sodium taurodeoxycholate) and biomolecules (Phosphatidylcholine and human serum albumin) solutions. Cell culture studies by collaborators revealed that solvent-exchanged and TDOC-exfoliated pristine FLG displayed minimal toxicity and albumin-exfoliated FLG hardly any cytotoxicity, whereas phosphatidylcholine-exfoliated FLG was cytotoxic. Raman spectroscopy is a well-established technique used to study the local deformation of carbon-based composites by following the shift rates of the Raman 2D band with strain. Raman active strain coatings were produced from epoxy composites made with the FLG produced by LPE in organic solvents and by electrochemical exfoliation method. The deformation experiments on these coatings revealed little or no strain sensitivity, due to several factors such as length of flakes, processing history, graphene loading, defects in graphene and alignment of flakes within the composites. As an alternative, composite coatings made from chemical vapour deposition (CVD) graphene were investigated. Excellent strain sensitivity was observed upon various cyclic deformational sequences and Raman mapping over 100 × 100 µm area. In comparison to the commercially available wide area strain sensors, CVD graphene composite coatings with a calculated absolute accuracy of ~ ± 0.01 % strain and absolute resolution of ~ 27 microstrains show promise for wide area Raman-based strains sensors.
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Bares, Hugo. "Fonctionnalisation chimique du graphène, : vers des matériaux bidimentionnels photo actifs pour la reconnaissance et l'électronique moléculaire." Thesis, Bordeaux, 2015. http://www.theses.fr/2015BORD0400/document.

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Depuis la découverte des propriétés physiques et électroniques du graphène, un très grand nombre de méthodes visant à produire et modifier chimiquement le graphène ont été développées afin d'étendre et améliorer ses capacités en vue de futures applications. Les travaux réalisés au cours de cette thèse ont portés sur une méthode exfoliation du graphite en phase liquide assistée d'une réaction de cycloaddition réversible. Cette approche repose sur la réaction de Diels-Alder entre le graphite et un diène masqué très réactif, et se révèle être très efficace dans des solvants organiques volatils qui ne permettent pas l'exfoliation directe du graphite. L'introduction de groupements fonctionnels sur le diène a permis de moduler les propriétés de surface de films de graphène, ainsi que de post-fonctionnaliser les feuillets de graphène afin d'apporter une plus-value au matériau
Since the discovery of the exciting properties of graphene, many techniques to produce and chemically modify graphene have been developed in order to expand and improve its properties in view of future applications. The study presented in this thesis focus on a process for the chemically-assisted exfoliation of graphite based on a reversible cycloaddition reaction. It relies on the Diels-Alder reaction between graphite and highly reactive masked diene, and it is effective even in solvents that are otherwise ineffective for exfoliation of graphite. Furthermore, it is possible to introduce functional groups on the diene, thereby enabling the tuning of the surface properties of graphene, as well as the post-functionalization of graphene sheets
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Juhlin, Stina. "Evaulation of liquid-exfoliatedgraphene as additive in Ag-basedsliding contacts." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-353942.

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This master thesis work is performed at ABB Corporate Research Center inVästerås. The aim of this study is to investigate Ag:graphene composites as slidingelectrical contacts, suitable for use in e.g. tap-changers. Three different graphenematerials, all produced by a low-cost exfoliation process, are evaluated in this study. The results are compred to an ongoing work on Ag:GO (graphene oxide) composites. This material has shown very good tribological properties, however it hasbeen difficult to handle during sintering processing. The goal of this study is to geteven better tribological, electrical and mechanical properties than Ag:GO, and also todevelop a new powder-metallurgical method to produce the Ag:graphene composites.The study also investigates the influence of graphene flake size and concentration aswell as microstructure of the Ag:graphene composites. This report focuses on aninvestigation of the graphene raw material quality from the suppliers, and friction,wear and resistance analysis of the composites. This is done by using Ramanspectroscopy, SEM with EDS, LOM, tribometer tests and resistivity analysis. Raman and SEM analyses show that none of the supplied LEG materials are ofhigh-quality G (single or bilayer), but rather multi-layer graphene or even graphite.Small amounts of graphene added to Ag gave extremly low friction (μ<0.2 vs. pureAg μ~1.3, 5 N load and 5 cm/s speed). The composite manufacturing process hadcritical steps, which have to be optimized, to obtain low values of friction. Severedegassing of the composites was observed for some sampes, but the samples stillmaintained good friction values. SEM and EDS analyses of 2dfab’s wear track show abuild-up thin carbon-containing tribofilm on the Ag surface. Indicating that G ispresent, and works as a lubricant, creating good tribological properties. The resultsfrom this project may for sure be of importance for future ABB products in specificindustrial applications.
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Camargo, Elaine Farneze de. "Obtenção do grafeno através da esfoliação em fase líquida do grafite." Universidade Presbiteriana Mackenzie, 2015. http://tede.mackenzie.br/jspui/handle/tede/1356.

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The different methods of obtaining two-dimensional materials are being researched intensively, due to their promising physical and chemical properties. Among the methods of obtaining graphene, the liquid phase exfoliation (LPE) of graphite is proving to be a relatively simple and efficient process for the production of flakes of high quality and large scale. It is primarily based on the separation of the layers of graphite in liquids, such as common organic solvents and aqueous surfactant solutions. In this work the exfoliation of graphite was performed in liquid phase by sonication in aqueous suspension in the presence of an industrial reagent. A comparison with suspensions not using the polymeric surfactant indicates that its presence is necessary, because it prevents the re-agglomeration of the layers after sonication, through the multipolar and electrostatic repulsion mechanism. This result coincides with the reports of most recent works on liquid-phase exfoliation of graphite.
Os diferentes métodos de obtenção de materiais bidimensionais estão sendo pesquisados intensamente, devido a suas promissoras propriedades físicas e químicas. Entre os métodos de obtenção de grafeno, a esfoliação em fase líquida (LPE) de grafite está demonstrando ser um processo relativamente simples e eficaz de produção de flocos de alta qualidade e em larga escala. Ela se baseia principalmente na separação das camadas de grafite em líquidos, tais como solventes orgânicos comuns e soluções surfactantes aquosas. Neste trabalho foi realizada a esfoliação de grafite em fase líquida através da sonificação em suspensão aquosa em presença um reagente industrial. A comparação com resultados usando suspensões sem o agente surfactante polimérico indica que a presença deste é necessária, pois evita a reaglomeração das camadas após a sonificação, através do mecanismo de multipolo e repulsão eletrostática. Este resultado coincide com os reportes dos trabalhos mais recentes realizados sobre esfoliação em fase líquida de grafite.
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Hrubý, Jakub. "Příprava a charakterizace hybridních materiálů na grafenové bázi." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-318708.

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Grafen v kombinaci s komplexy kovů by mohl poskytnout nové přísutpy v hybridních materiálech založených na grafenové bázi a v oblasti molekulárního magnetismu. Obě témata jsou velmi diskutovaná jako taková, nicméně, výzkumu vedoucího k možnosti jejich míchání není mnoho. Vzorky byly připraveny sonikací grafitu v kapalné fázi, což vedlo k exfoliaci grafenu. Následně byly nadeponovány pomocí modiikované Lagmuirovy– Schaeferovy depoziční metody různé komplexy kovů na substrát pokrytý grafenem. Klíčovým krokem bylo určení vlastností takto připraveného materiálu. Proto byly následně vlastnosti takového hybridního materiálu charakterizovány pomocí vysokofrekvenční elektronové paramagnetické rezonance (angl. HFEPR), rastrovacího elektronového mikroskopu, (angl. SEM), Ramanovou spektroskopií a čtyř bodovou metodou měření odporu. V této práci jsme potvrdili naši presumpci, že je možné vytvořit hybridní materiál smícháním exfoliovaného grafenu s molekulárními magnety pro získání nových magnetických a elektronických vlastností, které by mohly být využity v další generaci detektorů a elektroniky.
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Book chapters on the topic "Liquid phase exfoliation (LPE)"

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Elwell, Dennis. "Liquid Phase Epitaxy (LPE)." In Inorganic Reactions and Methods, 80–81. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470145333.ch43.

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Deb, Rajesh, Rajesh Kumar, Manjula G. Nair, and Saumya R. Mohapatra. "Liquid Phase Exfoliation and Microwave Assisted Modification in MoS2 Nanostructure." In Proceedings of 28th National Conference on Condensed Matter Physics, 11–18. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5407-7_2.

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Gada, Mariam, Mohammad Zaid, Mohd Mudassir Husain, and S. S. Islam. "Liquid-Phase Exfoliation of 2D-MoS2 Nanostructures at Varying Sonication Times and Their Subsequent Analysis." In Lecture Notes in Mechanical Engineering, 177–85. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5371-1_16.

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Yao, X., and Y. Chen. "Liquid phase epitaxy (LPE) growth of high-temperature superconducting films." In High-Temperature Superconductors, 275–314. Elsevier, 2011. http://dx.doi.org/10.1533/9780857091031.2.275.

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Bhoria, Randhir. "Enhancing Liquid Phase Exfoliation of Graphene in Organic Solvents with Additives." In Graphene and its derivatives - Synthesis and applications [Working Title]. IntechOpen, 2019. http://dx.doi.org/10.5772/intechopen.81462.

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Backes, Claudia. "Production of graphene and other two-dimensional nanosheets by liquid phase exfoliation." In Graphene, 251–314. Elsevier, 2021. http://dx.doi.org/10.1016/b978-0-08-102848-3.00001-3.

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Eredia, Matilde, Artur Ciesielski, and Paolo Samorì. "6. Graphene via Molecule-Assisted Ultrasound- Induced Liquid-Phase Exfoliation: A Supramolecular Approach." In Chemistry of Carbon Nanostructures, edited by Klaus Muellen and Xinliang Feng. Berlin, Boston: De Gruyter, 2017. http://dx.doi.org/10.1515/9783110284645-007.

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Sohrabi, Beheshteh. "Amphiphiles." In Self-Assembly of Materials and Supramolecular Structures [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.107880.

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Amphiphiles form a large group of supramolecular structures can aggregate and be adsorbed spontaneously at the interface. Amphiphilicity is a feature of polar contrast between the groups that make up a molecule and their spatial separation. The most important classes of amphiphiles are surfactants, lipoproteins, and polymers that have hydrophilic and hydrophobic chemical moieties covalently bonded and spatially separated. Since surfactants are widely used in various industrial fields, we decide to focus on surfactants in addition to a brief review of the other amphiphiles. Surfactants are used in industrial applications and consumer products, from medical to cosmetics and food industry. Various industries require new surfactants from sustainable and renewable raw materials with improved performance, biocompatibility and minimal environmental impact. For example, liquid phase exfoliation and dispersion methods using surfactants in the solvent media have recently gained lots of attention because of their great potential for large-scale production. Notably, an ideal exfoliation for reaching desired graphene and CNTs may be achievable by molecular engineering of surfactants to improve the quality of molecular interactions. This chapter experimentally and theoretically highlighted physico-chemical characteristic parameters, and interactions of the components, which are essential to design and discover efficient exfoliation and dispersion systems.
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Conference papers on the topic "Liquid phase exfoliation (LPE)"

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Arti, Sharma. "Preparation of graphene in surfactant/water solution by liquid phase exfoliation." In PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON PHYSICS OF MATERIALS AND NANOTECHNOLOGY ICPN 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0009403.

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Sharma, Arti, Anjali Joshi, Gaurav Verma, and Amrit Pal Toor. "Surfactant assisted liquid phase exfoliation of graphene via probe tip sonication." In ADVANCED MATERIALS AND RADIATION PHYSICS (AMRP-2015): 4th National Conference on Advanced Materials and Radiation Physics. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4929263.

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Viti, L., V. Bianchi, T. Carey, L. Li, E. H. Linfield, A. G. Davies, A. Tredicucci, et al. "Graphene Saturable Absorbers at Terahertz Frequency from Liquid Phase Exfoliation of Graphite." In CLEO: Science and Innovations. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/cleo_si.2018.stu4d.6.

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Sahoo, Dhirendra, Budhi Singh, and Bhaskar Kaviraj. "Strongly luminescent MoS2 nanosheets prepared by liquid phase exfoliation without any surfactant." In 3RD INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC-2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0001325.

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Zhang, De-qing, Ji-xing Chai, Yi-xuan Jia, Luo-jie Wang, Zhen-long Zhao, and Mao-sheng Cao. "Facile Preparation of Few-layer MoS2-NS by Liquid-Phase Ultrasonic Exfoliation." In 2017 International Conference on Manufacturing Engineering and Intelligent Materials (ICMEIM 2017). Paris, France: Atlantis Press, 2017. http://dx.doi.org/10.2991/icmeim-17.2017.74.

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Hang, Da-Ren, Krishna Hari Sharma, De-You Sun, Fong-Yao Su, and Sk Emdadul Islam. "Morphology and photoluminescence of nanoscale few-layered MoS2 prepared by liquid phase exfoliation." In 2016 Compound Semiconductor Week (CSW) [includes 28th International Conference on Indium Phosphide & Related Materials (IPRM) and 43rd International Symposium on Compound Semiconductors (ISCS)]. IEEE, 2016. http://dx.doi.org/10.1109/iciprm.2016.7528707.

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Wang, Mengjiao. "2D BiOBr/MoS2 heterojunctions by liquid-phase exfoliation as photoelectrocatalysts for hydrogen evolution." In Low-Dimensional Materials and Devices 2022, edited by Nobuhiko P. Kobayashi, A. Alec Talin, Albert V. Davydov, and M. Saif Islam. SPIE, 2022. http://dx.doi.org/10.1117/12.2634279.

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wang, mengjiao, Teresa Gatti, and Matteo Crisci. "2D BiOBr/MoS2 heterojunctions by liquid-phase exfoliation as photoelectrocatalysts for hydrogen evolution." In Materials for Sustainable Development Conference (MAT-SUS). València: FUNDACIO DE LA COMUNITAT VALENCIANA SCITO, 2022. http://dx.doi.org/10.29363/nanoge.nfm.2022.017.

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Szydlowska, Beata M., and Werner J. Blau. "Highly Monolayer Enriched WS2 Dispersions Produced by Liquid Phase Exfoliation in Liquid Cascade as Nonlinear Optical Materials." In Novel Optical Materials and Applications. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/noma.2016.notu3d.5.

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Schiettecatte, Pieter, and Zeger Hens. "A Thermodynamic Perspective on Liquid Phase Exfoliation of Two Dimensional Van der Waals Solids." In nanoGe Fall Meeting 2021. València: Fundació Scito, 2021. http://dx.doi.org/10.29363/nanoge.nfm.2021.202.

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