Design Principles and Insights into the Liquid-Phase Exfoliation of Alpha-MoO3 for the Production of Colloidal 2D Nano-inks in Green Solvents

2021 ◽  
Author(s):  
Matteo Crisci ◽  
Paolo Dolcet ◽  
Jijin Yang ◽  
Marco Salerno ◽  
Péter Bélteky ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Design Principles ◽  
Green Solvents ◽  
Liquid Phase Exfoliation

Green Solvents for the Liquid-Phase Exfoliation of Biochars

2021 ◽  
Author(s):  
Juliana L. Vidal ◽  
Stephanie M. V. Gallant ◽  
Evan P. Connors ◽  
Douglas D. Richards ◽  
Stephanie L. MacQuarrie ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Green Solvents ◽  
Liquid Phase Exfoliation

scholarly journals Liquid-Phase Exfoliation of Biochars in Green Solvents and Correlation with Solvent Parameters

2020 ◽  
Author(s):  
Juliana Vidal ◽  
Stephanie Gallant ◽  
Douglas Richards ◽  
Stephanie MacQuarrie ◽  
Francesca Kerton
Keyword(s):  
Liquid Phase ◽  
Thermochemical Treatment ◽  
Layered Materials ◽  
Green Solvents ◽  
Solvent Parameters ◽  
Biomass Residues ◽  
Transmission Electron ◽  
Before And After ◽  
Liquid Phase Exfoliation ◽  
Concentrated Dispersions

Liquid-phase exfoliation (LPE) is a process frequently used to yield small sheets of layered materials. These materials are prepared via direct or indirect sonication in an ideal solvent, and the sheets produced often present remarkable chemical and physical properties. Unfortunately, the preferred solvents for exfoliation processes are frequently toxic and possess several health risks. In this work, we show the use of LPE in green solvents to access nanostructures of biochar. Biochar is a material produced after thermochemical treatment of biomass residues and it is an important tool for the sequestration of greenhouse gases. Herein, hardwood and softwood biomass residues (e.g. sludge, bark, and sawdust) are used to prepare pristine and oxidized biochars which are then exfoliated in a range of solvents. Stable dispersions containing up to 75% by weight of exfoliated biochar could be obtained. A range of solvents were screened for LPE of biochars to identify ‘green' options that could afford highly concentrated dispersions. The properties of the biochar before and after exfoliation were evaluated using Raman spectroscopy and Transmission Electron Microscopy. Correlations between effective LPE of biochar in a solvent and different solvent parameters were established. For example, LPE of oxidized biochars is more efficient in hydrogen-bond accepting solvents due to the increased concentration of carboxylic acid and alcohol functional groups within this material, when compared with pristine biochars.<div><br></div>

scholarly journals Liquid-Phase Exfoliation of Biochars in Green Solvents and Correlation with Solvent Parameters

2021 ◽  
Author(s):  
Juliana Vidal ◽  
Stephanie Gallant ◽  
Evan Connors ◽  
Douglas Richards ◽  
Stephanie MacQuarrie ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Dimethyl Carbonate ◽  
Layered Materials ◽  
Polyethylene Glycols ◽  
Green Solvents ◽  
Biomass Waste ◽  
Solvent Parameters ◽  
Benign Solvents ◽  
Liquid Phase Exfoliation ◽  
Concentrated Dispersions

<div> <div> <div> <div> <p>Liquid-phase exfoliation (LPE) is a process frequently used to overcome the interactions between layers in layered materials to produce small sheets of material, with remarkable properties and high value applications. Materials are prepared via direct or indirect sonication in a solvent that must be able to effectively disperse and stabilize the sheets produced. Unfortunately, the preferred solvents for exfoliation processes are often toxic and possess several health risks. In this work, we show that LPE in greener solvents can be used to access nanostructures of biochar and further improve the applications of this renewable and bio-based material. Herein, pristine and oxidized biochars prepared from hardwood and softwood biomass waste (e.g. sludge, bark, and sawdust) are exfoliated in a range of solvents to allow the identification of benign alternatives that could afford highly concentrated dispersions. The majority of biochar nanostructures produced after exfoliation are stacked nanosheets containing between 2-8 layers (average 15 nm thickness). Correlations between effective LPE of biochar in solvents and different solvent parameters, including Kamlet-Taft, were established and allowed greener solvents to be used. Surface modification of biochars (e.g. via oxidation) has potential to increase their dispersibility in more benign solvents. LPE of oxidized biochars is more efficient in hydrogen-bond accepting solvents due to the increased concentration of carboxylic acid and alcohol functional groups on the surface of particles, when compared to non- functionalized biochars. Dispersions containing 0.20-0.75 mg/mL exfoliated oxidized biochar were obtained in solvents such as polyethylene glycols, glycerol formal and e-caprolactone. Moreover, LPE of pristine biochars in dimethyl carbonate, ethyl acetate, and solketal gave similar yields to more commonly used solvent for this process, N-methyl-2-pyrrolidone (NMP) a known reprotoxic molecule. </p> </div> </div> </div><br></div>

scholarly journals Liquid-Phase Exfoliation of Biochars in Green Solvents and Correlation with Solvent Parameters

2020 ◽  
Author(s):  
Juliana Vidal ◽  
Stephanie Gallant ◽  
Douglas Richards ◽  
Stephanie MacQuarrie ◽  
Francesca Kerton
Keyword(s):  
Liquid Phase ◽  
Thermochemical Treatment ◽  
Layered Materials ◽  
Green Solvents ◽  
Solvent Parameters ◽  
Biomass Residues ◽  
Transmission Electron ◽  
Before And After ◽  
Liquid Phase Exfoliation ◽  
Concentrated Dispersions

Liquid-phase exfoliation (LPE) is a process frequently used to yield small sheets of layered materials. These materials are prepared via direct or indirect sonication in an ideal solvent, and the sheets produced often present remarkable chemical and physical properties. Unfortunately, the preferred solvents for exfoliation processes are frequently toxic and possess several health risks. In this work, we show the use of LPE in green solvents to access nanostructures of biochar. Biochar is a material produced after thermochemical treatment of biomass residues and it is an important tool for the sequestration of greenhouse gases. Herein, hardwood and softwood biomass residues (e.g. sludge, bark, and sawdust) are used to prepare pristine and oxidized biochars which are then exfoliated in a range of solvents. Stable dispersions containing up to 75% by weight of exfoliated biochar could be obtained. A range of solvents were screened for LPE of biochars to identify ‘green' options that could afford highly concentrated dispersions. The properties of the biochar before and after exfoliation were evaluated using Raman spectroscopy and Transmission Electron Microscopy. Correlations between effective LPE of biochar in a solvent and different solvent parameters were established. For example, LPE of oxidized biochars is more efficient in hydrogen-bond accepting solvents due to the increased concentration of carboxylic acid and alcohol functional groups within this material, when compared with pristine biochars.<div><br></div>

scholarly journals Liquid-Phase Exfoliation of Biochars in Green Solvents and Correlation with Solvent Parameters

2020 ◽  
Author(s):  
Juliana Vidal ◽  
Stephanie Gallant ◽  
Douglas Richards ◽  
Stephanie MacQuarrie ◽  
Francesca Kerton
Keyword(s):  
Liquid Phase ◽  
Thermochemical Treatment ◽  
Layered Materials ◽  
Green Solvents ◽  
Solvent Parameters ◽  
Biomass Residues ◽  
Transmission Electron ◽  
Before And After ◽  
Liquid Phase Exfoliation ◽  
Concentrated Dispersions

Liquid-phase exfoliation (LPE) is a process frequently used to yield small sheets of layered materials. These materials are prepared via direct or indirect sonication in an ideal solvent, and the sheets produced often present remarkable chemical and physical properties. Unfortunately, the preferred solvents for exfoliation processes are frequently toxic and possess several health risks. In this work, we show the use of LPE in green solvents to access nanostructures of biochar. Biochar is a material produced after thermochemical treatment of biomass residues and it is an important tool for the sequestration of greenhouse gases. Herein, hardwood and softwood biomass residues (e.g. sludge, bark, and sawdust) are used to prepare pristine and oxidized biochars which are then exfoliated in a range of solvents. Stable dispersions containing up to 75% by weight of exfoliated biochar could be obtained. A range of solvents were screened for LPE of biochars to identify ‘green' options that could afford highly concentrated dispersions. The properties of the biochar before and after exfoliation were evaluated using Raman spectroscopy and Transmission Electron Microscopy. Correlations between effective LPE of biochar in a solvent and different solvent parameters were established. For example, LPE of oxidized biochars is more efficient in hydrogen-bond accepting solvents due to the increased concentration of carboxylic acid and alcohol functional groups within this material, when compared with pristine biochars.<div><br></div>

PbSe Nanocrystals Produced by Facile Liquid Phase Exfoliation for Efficient UV–Vis Photodetectors

2021 ◽  
Vol 31 (17) ◽  
pp. 2010401
Author(s):  
Lingfeng Gao ◽  
Rui Wang ◽  
Artem V. Kuklin ◽  
Han Zhang ◽  
Hans Ågren
Keyword(s):  
Liquid Phase ◽  
Liquid Phase Exfoliation

scholarly journals Impact of Pretreatment of the Bulk Starting Material on the Efficiency of Liquid Phase Exfoliation of WS2

Nanomaterials ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 1072
Author(s):  
Steffen Ott ◽  
Melanie Lakmann ◽  
Claudia Backes
Keyword(s):  
Liquid Phase ◽  
Quantum Yield ◽  
Aspect Ratio ◽  
Optical Quality ◽  
Starting Material ◽  
Binding Strength ◽  
Photoluminescence Quantum Yield ◽  
Out Of Plane ◽  
Liquid Phase Exfoliation ◽  
Pretreatment Conditions

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.

Two-Dimensional Lead Monoxide: Facile Liquid Phase Exfoliation, Excellent Photoresponse Performance, and Theoretical Investigation

ACS Photonics ◽  
2018 ◽  
Vol 5 (12) ◽  
pp. 5055-5067 ◽  
Author(s):  
Chenyang Xing ◽  
Xing Chen ◽  
Weichun Huang ◽  
Yufeng Song ◽  
Jihao Li ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Theoretical Investigation ◽  
Two Dimensional ◽  
Lead Monoxide ◽  
Liquid Phase Exfoliation

Direct Liquid Phase Exfoliation of Graphite to Produce Few-Layer Graphene by Microfluidization

2019 ◽  
Vol 19 (4) ◽  
pp. 2078-2086 ◽  
Author(s):  
Yu-Zhou Wang ◽  
Tian Chen ◽  
Hai-Hui Liu ◽  
Xue-Chen Wang ◽  
Xing-Xiang Zhang
Keyword(s):  
Liquid Phase ◽  
Layer Graphene ◽  
Liquid Phase Exfoliation ◽  
Few Layer Graphene
Sign in / Sign up

Export Citation Format

Share Document