Preparation and characterization of green graphene using grape seed extract for bioapplications

Yaragalla, Srinivasarao; Ramesh, R.; Jose, Jiya; Al-Maadeed, Somaya; Kalarikkal, Nandakumar; Thomas, Sabu

doi:10.1016/j.msec.2016.04.050

Cited by 61 publications

(21 citation statements)

References 68 publications

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“…As compared to sample manifest as h-BN/GO4/epoxy hybrid composite, containing the same amount of filler as sample h-BN/RGO4/epoxy hybrid composite, the only difference is GO, RGO and having less thermal decomposition temperature, i.e., 376.71 °C. This is because the thermal stability of RGO is better than GO, because of the presence of moisture and more oxygen functional groups in GO as related to RGO, which reduces the degradation temperature of GO [33,34]. In a similar way, we can identify the reason behind the thermal decomposition temperature of sample mh-BN/GO4/epoxy hybrid composite is 372.82 °C and sample mh-BN/RGO4/ epoxy hybrid composite is 374.53 °C.…”

Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 68%

Mechanical properties and thermal conductivity of epoxy composites enhanced by h-BN/RGO and mh-BN/GO hybrid filler for microelectronics packaging application

Nayak

Mohanty

2019

SN Appl. Sci.

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In recent years, significant interest has been focused on fabricating epoxy-based hybrid composite with a high thermal conductivity at optimum filler loading. As epoxy usually has a low thermal conductivity, the high intrinsic thermal conducting fillers such as h-BN, GO and RGO are incorporated. In this research, we report the epoxy-based hybrid composites with an enhanced thermal conductivity through silane-modified h-BN (mh-BN) with RGO. The sample containing 44.5 wt% (40 wt% mh-BN and 4.5 wt% RGO) hybrid filler exhibited the highest thermal conductivity (1.416 W/mK) which was 7 times that of pristine epoxy (0.21 W/mK). The thermal conductivities of RGO with unmodified h-BN (0.789 W/mK), GO with mh-BN (0.769 W/mK) and GO with unmodified h-BN (0.713) at 44.5 wt% loading are also reported. Comparison property studies of these above-mentioned four hybrid composites are described by lap shear strength, flexural strength, impact strength and thermogravimetric analysis. The fabricated hybrid composites exhibit outstanding performance in lap shear strength, thermal stability, and slightly reduced impact and flexural strength, which makes it as relevant for electronics packaging application such semiconductors, integrated circuit packaging, optoelectronics and also can attest potentiality in structural energy storage application. The atomic force microscopy and scanning electron microscopy verified the surface roughness and morphology of two optimized compositions, i.e., mh-BN with RGO and h-BN with RGO with the epoxy matrix. Also, Maxwell, Hashin-Shtrikmann and series equations are used to verify the obtained experimental value.

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Section: Thermogravimetric Analysis (Tga)mentioning

confidence: 68%

Mechanical properties and thermal conductivity of epoxy composites enhanced by h-BN/RGO and mh-BN/GO hybrid filler for microelectronics packaging application

Nayak

Mohanty

2019

SN Appl. Sci.

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“…These peaks have shifted to longer redshift wavelengths compared to other reports, indicating the conversion of graphene oxide to reduced graphene oxide as a result of heating during the deposition process. The absorption of light occurs in the ultraviolet region and blue part of the spectral range, relating to n-π * transition of carbonyl groups [44][45][46][47]. Comparing the absorption and transmittance spectra of pure graphene oxide and SG nano-composite shows that incorporating the silica into graphene oxide plates increases the transmittance rate and decreases the absorption of the films, which is the expected result because the pure silica is similar to glass and in UV-vis wavelength range, it is very transparent.…”

Section: Optical Properties Of Studied Filmsmentioning

confidence: 99%

Spray pyrolysis of graphene oxide based composite for optical and wettability applications

Alkhafaji

Khaleel

Miran

2020

Mater. Res. Express

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In this study, silica-graphene oxide nano-composites were prepared by sol-gel technique and deposited by spray pyrolysis method on glass substrate. The effect of changing the graphene/silica ratio on the optical properties and wetting of these nano-structures has been investigated. The structural and morphological properties of the thin films have been studied by x-ray diffraction spectroscopy (XRD), field emission scanning electron microscope (FESEM), energy dispersive x-ray spectroscopy (EDS) and atomic force microscope (AFM). XRD results show that silica structures present in the synthesized films exhibit amorphous character and there is a poor arrangement in graphene plates along their accumulation directions. The relationship between the contact angle of the water drop and the surface of thin films was analyzed by surface roughness. The results show that the contact angle is also decreased by decreasing the surface roughness. Absorption and transmittance spectra obtained from (UV-vis) of the studied films were used to compute and determine some optical parameters such as absorption coefficient, transmittance rate, optical gap, refractive index and extinction coefficient of the films. The calculated optical band gaps of films decrease by increase the silica contents in these structures.

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“…Graphene oxide (GO) is one of the main raw materials used in the manufacture of graphene-like products because it is easy to reduce by different physical methods, such as thermal treatment and laser irradiation, as well as electrochemical 1,2 and green chemical processes using vitamins, sugars, amino acids, and natural extracts. [3][4][5][6] Reduced graphene oxide (rGO), so called because not all oxygenated groups are removed in the reduction process, is expected to prevail in natural environments and in wastewater treatment plants, since GO can be reduced to rGO by bacterial respiration. 7,8 Therefore, the degree of reduction in rGO could vary depending on the conditions of the manufacturing process and on the prevailing environmental conditions.…”

Section: Introductionmentioning

confidence: 99%

Methane production enhanced by reduced graphene oxide in an anaerobic consortium supplied with particulate and soluble substrates

Bueno-López

Díaz‐Hinojosa

Rangel-Méndez

et al. 2020

J of Chemical Tech & Biotech

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BACKGROUND: Graphene materials have extensively been applied in several industries due to their enhanced properties. Predictably, these materials also end up in wastewaters generated from industrial sectors, and their effects on biological treatment systems are poorly understood. The aim of the present study was to assess the acute effects of graphene oxide (GO) with three different degrees of reduction [reduced GO (rGO) produced with reduction times of 1, 2, and 4 h] on the methane production of an anaerobic consortium. RESULTS: Synthesized rGO materials had a stimulatory effect increasing the maximum methanogenic activity (MMA) up to 14% and 114% when glucose and starch were provided as substrates, respectively, as compared to the MMA achieved in controls incubated in the absence of rGO. Reduction of GO promoted physical-chemical changes in its structure, such as the removal of epoxy groups, which prevented grapping of starch granules by the produced rGO sheets and triggered a better interaction between the latter and microorganisms. Furthermore, this work showed that rGO stimulated starch disintegration into its components, thus accelerating its hydrolysis, which was ultimately reflected in a higher MMA when this particulate polymer was used as substrate. CONCLUSION: This study reports for the first time the acute effects of rGO on the methanogenic activity of an anaerobic consortium supplied with both soluble and particulate substrates. This information is relevant to elucidate the effects of this graphene material in anaerobic microorganisms and to improve the performance of anaerobic systems during the treatment of industrial wastewaters.

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Preparation and characterization of green graphene using grape seed extract for bioapplications

Cited by 61 publications

References 68 publications

Mechanical properties and thermal conductivity of epoxy composites enhanced by h-BN/RGO and mh-BN/GO hybrid filler for microelectronics packaging application

Mechanical properties and thermal conductivity of epoxy composites enhanced by h-BN/RGO and mh-BN/GO hybrid filler for microelectronics packaging application

Spray pyrolysis of graphene oxide based composite for optical and wettability applications

Methane production enhanced by reduced graphene oxide in an anaerobic consortium supplied with particulate and soluble substrates

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