Abstract：
:In this work, we investigate the efficiency of graphene production from graphite by ultrasonic-induced exfoliation under different operational conditions. An ultrasonic bath and an ultrasonic horn tip were used, to show how the graphene production efficiency depends on the acoustic intensity and cavitation mechanism using graphite crystal with different initial sizes and characteristic lengths. Operational variables such as geometry, location and type of vessel containing the liquid phase, were also explored. All of them have effect on the cavitation process and directly influence the amount of graphene obtained. Remarkably, we found that the initial size of the graphite crystals has a marked impact in exfoliation process. Based on the above arguments we propose a combined protocol with a specific sequence to maximize the amount of graphene obtained.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Silva LI,Mirabella DA,Pablo Tomba J,Riccardi CCdoi
10.1016/j.ultras.2019.105989subject
Has Abstractpub_date
2020-01-01 00:00:00pages
105989eissn
0041-624Xissn
1874-9968pii
S0041-624X(19)30304-Xjournal_volume
100pub_type
杂志文章相关文献
ULTRASONICS文献大全abstract：:The present study investigated the effect of geometric parameters of the ultrasound instrument during meat salting in order to enhance salt diffusion and salt distribution in pork meat on a lab scale. The effects of probe size (∅2.5 and 1.3cm) and of different distances between the transducer and the meat sample (0.3,...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2017.03.017
更新日期：2018-02-01 00:00:00
abstract：:We study thickness-shear vibration of a quartz plate connected to two piezoelectric ceramic plates with initial deformations caused by a biasing electric field. The theory for small deformations superposed on finite biasing deformations in an electroelastic body is used. It is shown that the resonant frequencies of th...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2010.07.002
更新日期：2011-02-01 00:00:00
abstract：:In this paper the behaviour of strongly nonlinear waves in axisymmetric resonators is experimentally and numerically studied. Experiments are carried out in a cylindrical cavity, which transversal dimension is bigger than the longitudinal one, excited by a narrow band transducer. The quality factor and displacement am...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2005.02.001
更新日期：2005-08-01 00:00:00
abstract：:Most methods used to measure the thickness of thin liquid or solid surface films and coatings need access to the coated surface. In this work reflected ultrasonic pulses were used to measure a coating thickness from a solid back face. Piezoelectric transducers on the solid back face emitted ultrasound waves and receiv...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2020.106291
更新日期：2021-02-01 00:00:00
abstract：:The attenuation of ultrasound in homogenates of bovine skeletal muscle and suspensions of myofibrils was measured over the frequency range 1.5-7 MHz, and found to be proportional to protein concentration in both. In the homogenates it varied with frequency and temperature in a similar way to the attenuation in post ri...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/0041-624x(88)90071-6
更新日期：1988-07-01 00:00:00
abstract：:A localization approach of welded joint damage is proposed based on acoustic emission (AE) beamforming. In this method, a uniform line array is introduced to detect the AE signal of welded joints in specified area. In order to investigate the influence of fillet and crimping commonly existing in a welded plate structu...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2016.11.002
更新日期：2017-02-01 00:00:00
abstract：:This paper describes a completely non-contact ultrasonic method of gas flow metering using air-coupled leaky Lamb waves. To show proof of principle, a simplified representation of gas flow in a duct, comprising two separated thin isotropic plates with a gas flowing between them, has been modelled and investigated expe...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2018.04.008
更新日期：2018-09-01 00:00:00
abstract：:Local Defect Resonance (LDR) is exploited for non-destructive testing (NDT) by using ultrasonic vibrations to get a localized resonant activation of defected zones. The LDR technique relies on the local stiffness difference between the defect and the sound material. Analyzing the structure's displacement field at this...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2020.106130
更新日期：2020-07-01 00:00:00
abstract：:The T-matrix approach is used to calculate the scattering of sound waves by an ellipsoidal void in a fluid. Results are presented for the total cross-section of a sphere as a function of frequency; this is related to the detection of the onset of bends in divers. Results are also presented for the angular variation in...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/0041-624x(83)90073-2
更新日期：1983-07-01 00:00:00
abstract：:Experimentally observed dissipated nonlinearity in Lamb wave propagation in composites due to stress-relaxation is reported herein. It was found that the stress relaxation in composite is inherently coupled with the second order nonlinear parameter derived from the Lamb wave modes. Due to the combined effect of intern...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2019.01.002
更新日期：2019-07-01 00:00:00
abstract：:Intraluminal (within the alimentary tract) thermal surgery has been shown to be a useful therapeutic option when extracorporeal focused ultrasound applicators cannot be used since their beam may not reach the target site. If plane transducers are used for the treatment of alimentary tract tumours, the applicator must ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2004.01.088
更新日期：2004-04-01 00:00:00
abstract：:A method for measuring the mechanical quality factor (Q factor) of materials in large-amplitude flexural vibrations was devised on the basis of the original definition of the Q factor. The Q factor, the ratio of the reactive energy to the dissipated energy, was calculated from the vibration velocity distribution. The ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2016.03.012
更新日期：2016-07-01 00:00:00
abstract：:The characterization of brain tissue is crucial to better understand neurological disorders. Mechanical characterization is an emerging tool in that field. The purpose of this work was to validate a transient ultrasound technique aimed at measuring dispersion of mechanical parameters of the brain tissue. The first par...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2017.10.009
更新日期：2018-03-01 00:00:00
abstract：:This paper describes ultrasonic measurements of normal and tangential stiffnesses of the contacting interface between polished aluminum blocks subjected to nominal contact pressures up to about 3.8 MPa. These stiffnesses were evaluated by ultrasonic spectroscopy methods for the bulk (longitudinal and transverse) wave ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2007.08.005
更新日期：2007-12-01 00:00:00
abstract：:In the present work a general model of the vibrational behavior of the axle of a piezoelectric motor is proposed. In this motor, a cylinder-shaped permanent magnet, which act as a rotor, is pressed in contact with an end of a steel axle by means of the magnetic forces. The other end of the axle is fitted at the center...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2004.01.080
更新日期：2004-04-01 00:00:00
abstract：:Based on the original combination of picosecond acoustics and diamond anvils cell, recent improvements to accurately measure hypersonic sound velocities of liquids and solids under extreme conditions are described. To illustrate the capability of this technique, results are given on the pressure and temperature depend...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2014.04.011
更新日期：2015-02-01 00:00:00
abstract：:Over the last two decades, more efficient transducers were developed for the generation and reception of air-borne ultrasound, thus enabling the non-contact, non-contaminating inspection of composite laminates and honeycomb structures widely used in the aerospace industry. This paper presents the fundamentals of makin...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2006.05.091
更新日期：2006-12-22 00:00:00
abstract：:Ultrasonic standing wave chambers with acoustic pathlengths of 1.1 and 0.62 mm have been constructed. The chambers were driven at frequencies over the range 0.66-12.2 MHz. The behaviour of 2 microns diameter latex microparticles and 5 microns diameter yeast in the chambers has been elucidated. One (flow) chamber had a...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(98)00019-5
更新日期：1998-08-01 00:00:00
abstract：:In this study, 3D finite element simulation of ultrasonically-assisted drilling is carried out to analyze the effect of ultrasonic vibrations on common difficulties existed in conventional drilling. Influence of harmonic movement of drill bit on the formation of built-up edge is experimentally evaluated and also discu...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2016.11.009
更新日期：2017-03-01 00:00:00
abstract：:This paper deals with 2-D simulation of finite-amplitude standing waves behavior in rectangular acoustic resonators. Set of three partial differential equations in third approximation formulated in conservative form is derived from fundamental equations of gas dynamics. These equations form a closed set for two compon...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2006.05.008
更新日期：2006-12-22 00:00:00
abstract：:The motivation for this research stems from a need for providing a non-destructive testing method capable of detecting and locating any defects and microstructural variations within armour ceramic components before issuing them to the soldiers who rely on them for their survival. The development of an automated ultras...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2015.05.027
更新日期：2015-09-01 00:00:00
abstract：:In this paper, we propose a semi-analytical isogeometric analysis(S-IGA) approach in the twist space to investigate the dispersive properties in helical thread waveguides, which combines the advantages of the spectral approach and IGA. The convergence and accuracy of the proposed method are discussed, by comparing S-I...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2017.06.004
更新日期：2018-02-01 00:00:00
abstract：:Interference noising originating from the ultrasonic testing defect signal seriously influences the accuracy of the signal extraction and defect location. Time-frequency analysis methods are mainly used to improve the defects detection resolution. In fact, the S-transform, a hybrid of the Short time Fourier transform ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2013.09.004
更新日期：2014-02-01 00:00:00
abstract：:The mechanical pre-stress applied in piezotransducers used to generate high power ultrasound is needed to avoid ceramics fracture on traction cycle. Pre-stress levels inferior to 50 MPa can yield resonance shifting due to effectiveness of acoustic coupling between transducer pieces. Symmetrical transducers with differ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(03)00096-9
更新日期：2003-05-01 00:00:00
abstract：:In general, the design and analysis of ultrasonic motor and motor's control strategy are based on mathematical model. The academic model is widely used in the analysis of traveling wave ultrasonic motor (TWUSM). But the dispersive characteristic of piezoelectric ceramics and other complicated process, such as the fric...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2013.09.012
更新日期：2014-02-01 00:00:00
abstract：:A novel nanocomposite-inspired in-situ broadband ultrasonic sensor previously developed, with carbon black as the nanofiller and polyvinylidene fluoride as the matrix, was networked for acousto-ultrasonic wave-based passive and active structural health monitoring (SHM). Being lightweight and small, this kind of sensor...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2017.03.007
更新日期：2017-07-01 00:00:00
abstract：:The linear wave equation in a lossless medium is time reversible, i.e., every solution p(x, t) has a temporal mirror solution p(x, -t). Analysis shows that time reversal also holds for the lossless nonlinear wave equation. In both cases, time-reversal invariance is violated when losses are present. For nonlinear propa...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(00)00020-2
更新日期：2000-09-01 00:00:00
abstract：:This paper proposes a new pair of sequences whose cross-correlation values are zero except for the peak value and presents a new modulation method for an ultrasonic Doppler flowmeter with high sensitivity utilizing these sequences. In this method, transmitted and received waves are modulated and demodulated, respectiv...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/0041-624x(79)90023-4
更新日期：1979-11-01 00:00:00
abstract：:The ultrasound-induced harmonic microbubble response spectrum is known to shift to lower frequencies with increasing tissue attenuation. We hypothesized that this shift could be reproducibly detected in received broadband radiofrequency spectra. We used an automatic Gaussian curve-fitting technique to measure the mean...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(02)00397-9
更新日期：2003-03-01 00:00:00
abstract：:In the food industry, ultrasonic cutting is used to improve separation by a reduction of the cutting force. This reduction can be attributed to the modification of tool-workpiece interactions at the cutting edge and along the tool flanks because of the superposition of the cutting movement with ultrasonic vibration of...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2009.03.001
更新日期：2009-06-01 00:00:00
