Laser induced graphene /ceramic membrane composite: Preparation and characterization

Bayati, Mohamed; Peng, Haiming; Deng, Heng; Lin, Jian

doi:10.1016/j.memsci.2019.117537

Cited by 20 publications

(16 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…These mesopores were formed during laser scribing, which is consistent with previous results. 17,25 Transmission electron microscopy (TEM) of the microstructures of LIG-fPI and LIG-PI showed that the edges of the planar graphene layers formed highly ordered ripple-like wrinkles, approximately 0.38−0.42 and 0.34−0.38 nm long, respectively (Figure 2b). Both LIG-fPI and LIG-PI were stacked in (002) planes, and the space between two neighboring graphene layers possibly increased due to thermal expansion and the liberation of gaseous products during laser photothermal treatment.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…Particularly, via one-step laser irradiation, carbon atoms in the aromatic backbone of PI can be sp 2 -hybridized while the remaining atoms are liberated as gaseous products to form 3D (meso)porous structures (pore diameter = 2−50 nm). 17,24,25 LIG electrodes exhibit rapid charging−discharging with a high energy density due to their porous structure. However, the limited specific surface area of bare LIGs inhibits charge accumulation on their active sites.…”

Section: ■ Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laser Scribing of Fluorinated Polyimide Films to Generate Microporous Structures for High-Performance Micro-supercapacitor Electrodes

Kim

Jeong

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

Laser-induced graphene (LIG) typically exhibits a mesostructure with a small specific surface area, which is detrimental to the electrochemical performance of micro-supercapacitors (MSCs). Herein, 3D nanostructured LIGs patterned on fluorinated polyimides (fPIs) via a laser photothermal method are reported. During laser-induced graphitization, a highly microporous structure in the LIG develops. Consequently, the patterned LIG (LIG-fPI) exhibits a very large specific surface area (1126.0 m 2 g −1 ), thereby enhancing its electrochemical performance. Specifically, in an H 2 SO 4 aqueous electrolyte, the micropatterned electrode exhibits an exceptional areal capacitance of 110 mF cm −2 (determined by cyclic voltammetry), which is 27 times higher than that of a LIG based on commercial polyimides and at least 7 times higher than that of current state-of-the-art MSCs. Furthermore, mechanically stable and flexible LIG-fPI-MSCs with an organic gel polymer electrolyte (working potential = ∼3 V) show very high power and energy densities of 0.58 mW cm −2 and 0.01 mW h cm −2 , respectively. Thus, these LIGs are promising for application in high-performance MSCs for flexible microelectronics.

show abstract

Section: ■ Results and Discussionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Laser Scribing of Fluorinated Polyimide Films to Generate Microporous Structures for High-Performance Micro-supercapacitor Electrodes

Kim

Jeong

et al. 2020

ACS Appl. Energy Mater.

View full text Add to dashboard Cite

show abstract

“…Results demonstrated that modified membranes manifested not only long-lasting salt retention but also greater stability [ 35 ]. In another work conducted by Mohamed Bayati et al (2020) for ceramic membranes modification, laser-induced graphene was coated on microporous ceramic membranes’ substrate [ 36 ]. Results confirmed the firmly bonded graphene layer with a promising potential for many wastewater applications.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Gum Arabic-Graphene (GGA) Modified Polyphenylsulfone (PPSU) Mixed Matrix Membranes: A Systematic Evaluation Study for Ultrafiltration (UF) Applications

et al. 2021

View full text Add to dashboard Cite

In the current work, a Gum, Arabic-modified Graphene (GGA), has been synthesized via a facile green method and employed for the first time as an additive for enhancement of the PPSU ultrafiltration membrane properties. A series of PPSU membranes containing very low (0–0.25) wt.% GGA were prepared, and their chemical structure and morphology were comprehensively investigated through atomic force microscopy (AFM), Fourier transforms infrared spectroscopy (FTIR), X-ray diffraction (XRD), and field emission scanning electron microscopy (FESEM). Besides, thermogravimetric analysis (TGA) was harnessed to measure thermal characteristics, while surface hydrophilicity was determined by the contact angle. The PPSU-GGA membrane performance was assessed through volumetric flux, solute flux, and retention of sodium alginate solution as an organic polysaccharide model. Results demonstrated that GGA structure had been successfully synthesized as confirmed XRD patterns. Besides, all membranes prepared using low GGA content could impart enhanced hydrophilic nature and permeation characteristics compared to pristine PPSU membranes. Moreover, greater thermal stability, surface roughness, and a noticeable decline in the mean pore size of the membrane were obtained.

show abstract

“…Figure 6.1 shows the general preparation procedure of LIG. The details of the preparation have been reported in previous publications [199,233]. In brief, the starting material was a commercially available PI film (Kapton ® , thickness 127 µm, McMaster-Carr, USA).…”

Section: Preparation Of Laser Induced Graphitic Materials (Lig)mentioning

confidence: 99%

“…Similar results were reported by Lupul et al [218] for the adsorption of ATZ on activated carbon (AC). Since LIG is highly hydrophobic, with a contact angle of 138.4º [233], hydrophobic interactions between ATZ and LIG cannot be eliminated. Polar nitrogen and oxygen functional groups on the carbon surface may reduce the accessibility of ATZ to adsorption sites because they act as water binding centers and ease the formation of water clusters [215].…”

Section: Adsorption Isothermsmentioning

confidence: 99%

Interaction at the solid-water interface of 0d and 2d carbon nanoparticles : environmental impacts and applications for contaminant removal

Bayati¹

Self Cite

View full text Add to dashboard Cite

Carbon dots (CDs) and graphene oxide (GO) are rapidly emerging carbon-based nanomaterials that, due to their growing applications, will inevitably find their way to natural waters; however, their environmental fate is mostly unknown. Carbon dots with different surface functionality and graphene oxide were fabricated and characterized. Their surface charge, given by the zeta potential, and their hydrodynamic diameter in suspension were investigated under a variety of environmentally relevant conditions. The effect of ionic strength was studied in the presence of monovalent (NaCl) and divalent (CaCl2) cations, for pH levels from 3 to 11; humic acid was used as a model for dissolved natural organic matter. Total potential energies of interactions were modeled by classical DLVO theory. The experimental results for CDs showed that water chemistry altered the surface charge of the nanomaterials, but their hydrodynamic size could not be correlated to those changes. Nanoparticles remained largely stable in suspension, with some exception at the highest ionic strength considered. DLVO theory did not adequately capture the aggregation behavior of the system. Moreover, cation and/or humic acid adsorption negatively affected the emission intensity of the particles, suggesting limitations to their use in natural water sensing applications. The results for GO showed that the GO is negatively charged over a wide range of pH and the pH did significantly affect GO stability at a level of 4 or higher, but the particles became unstable below pH 3 due to protonation of âˆ’COOH at the edge. Ionic strength (IS) and salt type had observable effects on stability as a result of electrical double layer compression and specific interactions. CaCl2 affects GO more noticeably than NaCl because of the binding ability of Ca2+ ions with carboxyl and hydroxyl functional groups. The applicability of DLVO theory as a predictive tool was investigated by modeling GO sheets in two different geometries; three-dimensional sphere like particles and two-dimensional particles at different values of pH and IS. Overall, the specific interactions and chemical structure of adsorbed organics had a dominant role in GO stability. Laser induced graphene (LIG) can be fabricated in one-step, scalable, reagent-free process, by irradiation of a commercial polyimide (PI film) by a CO2 infrared laser under ambient conditions. This approach is environmentally and economically promising fabrication method. Laser induced graphene (LIG) was successfully fabricated on microporous ceramic membranes. The surface area, morphology, and chemical characterizations were performed on the LIG layer. Water contact angle measurements showed the hydrophobicity of LIG. Pure water and solvents with different polarities were used to understand the solvent flux behavior of LIG membrane. The LIG membrane showed very high non-polar solvent fluxes and remarkably low water permeability, and thus, the transport through the LIG membrane is related to dipole moment and dielectric constant, represented by solvent polarity. The LIG membrane achieved 90 [percent] rejection for 255 nm diameter silica particles, suggesting the presence of submicron size connecting pore channels that dominate the transport mechanism. Furthermore, LIG was used as adsorbent for the removal of atrazine (ATZ) from water. The effect of water chemistry, presence of humic acid (HA), adsorption time, and initial ATZ concentration on the adsorption process was explored. The prepared LIG exhibited significant removal of ATZ from aqueous solutions; hydrophobicity and [pi]-[pi] interactions played important roles in the process. Adsorption of ATZ on LIG followed a pseudo-second order kinetic model and Langmuir model for the isotherm with maximum adsorption capacity of 15.0 mg ATZ/g LIG. Adsorption was more favorable at higher pH and not affected by ionic strength. LIG exhibited enhanced performance over many previously reported adsorbents. The introduction stage of HA with respect to ATZ influenced the results: pre-introduction of HA reduced ATZ adsorption by 32 [percent], whereas post-introduction of HA resulted in a slight release of ATZ from the LIG.

show abstract

Laser induced graphene /ceramic membrane composite: Preparation and characterization

Cited by 20 publications

References 46 publications

Laser Scribing of Fluorinated Polyimide Films to Generate Microporous Structures for High-Performance Micro-supercapacitor Electrodes

Laser Scribing of Fluorinated Polyimide Films to Generate Microporous Structures for High-Performance Micro-supercapacitor Electrodes

Fabrication of Gum Arabic-Graphene (GGA) Modified Polyphenylsulfone (PPSU) Mixed Matrix Membranes: A Systematic Evaluation Study for Ultrafiltration (UF) Applications

Interaction at the solid-water interface of 0d and 2d carbon nanoparticles : environmental impacts and applications for contaminant removal

Contact Info

Product

Resources

About