Polyaniline/Carbon black nanocomposites: The role of synthesis conditions on the morphology and properties

2018 ◽  
Vol 16 ◽  
pp. 14-21 ◽  
Author(s):  
Luis M.G. da Silva ◽  
Hugo G. Lemos ◽  
Sydney F. Santos ◽  
Renato A. Antunes ◽  
Everaldo C. Venancio
Keyword(s):  
Carbon Black ◽  
Synthesis Conditions

THE ROLE OF CARBON BLACK IN THE THERMAL OXIDATION OF POLYOLEFINS

Carbon ◽  
1960 ◽  
pp. 63-69 ◽  
Author(s):  
W.L. HAWKINS ◽  
M.A. WORTHINGTON ◽  
F.H. WINSLOW
Keyword(s):  
Carbon Black ◽  
Thermal Oxidation

Effect of Synthesis Conditions on Pseudocapacitance Properties of Nitrogen-Doped Porous Carbon Materials

2019 ◽  
Vol 59 ◽  
pp. 112-125
Author(s):  
Volodymyr Boichuk ◽  
Volodymyr Kotsyubynsky ◽  
Andrii Kachmar ◽  
Sergiy Budzulyak ◽  
Ivan Budzulyak ◽  
...  
Keyword(s):  
Carbon Materials ◽  
Aqueous Electrolyte ◽  
Electrochemical Impedance ◽  
Galvanostatic Charge ◽  
Discharge Data ◽  
Synthesis Conditions ◽  
Capacitive Properties ◽  
Charge Discharge ◽  
Redox Capacitance

The electrochemical properties of the nitrogen-enriched carbons obtained by plant raw treatment as electrode material for supercapacitors were investigated by electrochemical impedance spectroscopy, cycling voltammetry and galvanostatic charge-discharge cycling in KOH aqueous electrolyte. The effect of activation agent (NaOH) concentration and carbonization temperature were analyzed. The separation of double layer and redox capacitance components was done. The dominating role of microporosity for capacitive properties was demonstrated. The capacitance of model capacitors based on carbons obtained at different modes was calculated from both from cycling voltammetry and galvanostatic charge-discharge data. The maximal values of specific capacitance of carbon materials carbonized at 600°C and 900°C are about 100 and 120 F/g, respectively.

Experimental investigation on the role of PVA in eliminating inhibition phenomenon of carbon black during the synthesis of polystyrene/carbon black composite particles

2012 ◽  
Vol 52 (6) ◽  
pp. 1309-1316 ◽  
Author(s):  
Juntao Yan ◽  
Chunlei Wang ◽  
Yan Gao ◽  
Zaihang Zheng ◽  
Zhiqiang Cheng ◽  
...  
Keyword(s):  
Experimental Investigation ◽  
Carbon Black ◽  
Composite Particles

scholarly journals Carbon black suppresses the osteogenesis of mesenchymal stem cells: the role of mitochondria

2018 ◽  
Vol 15 (1) ◽  
Author(s):  
Yulai Shen ◽  
Lu Wu ◽  
Dongdong Qin ◽  
Yankai Xia ◽  
Zhu Zhou ◽  
...  
Keyword(s):  
Stem Cells ◽  
Mesenchymal Stem Cells ◽  
Carbon Black

Carbon Black. II—The Role of Oxygen

1930 ◽  
Vol 3 (1) ◽  
pp. 122-130
Author(s):  
G. R. Johnson
Keyword(s):  
Zinc Oxide ◽  
Carbon Black ◽  
Zinc Dust ◽  
Volatile Matter ◽  
The State ◽  
High Carbon

Abstract The results reported in this paper confirm the indication of previous work that a portion of the oxygen in carbon black exists in rather definite chemical combinations on the surface of a hydrocarbon with a high carbon-hydrogen ratio. It is not clear yet whether all of the oxygen in carbon black exists in this state, as previous work has shown that after heating for extended periods at 955° C. there still remains a small amount of oxygen in the black. It has been shown that the oxygen attached as here described does not exist in the state of gaseous adsorption and cannot be removed by heat alone as oxygen, but can be removed by reaction with zinc dust at temperatures below that at which gaseous evolution usually takes place. The oxygen goes over to zinc oxide and the volatile matter of the residue is considerably reduced.

scholarly journals The Role of Carbon Black on Devulcanization of Natural Rubber by Microwaves

2015 ◽  
Vol 18 (4) ◽  
pp. 791-797 ◽  
Author(s):  
Fabiula Danielli Bastos de Sousa ◽  
Carlos Henrique Scuracchio
Keyword(s):  
Carbon Black ◽  
Natural Rubber

Pathogenetic role of no-reflow phenomenon in experimental subarachnoid hemorrhage in dogs

1977 ◽  
Vol 46 (4) ◽  
pp. 454-466 ◽  
Author(s):  
Takao Asano ◽  
Keiji Sano
Keyword(s):  
Subarachnoid Hemorrhage ◽  
Carbon Black ◽  
Acute Stage ◽  
Cerebrospinal Fluid Leakage ◽  
Pathogenetic Role ◽  
No Reflow ◽  
No Reflow Phenomenon ◽  
Sensory Evoked ◽  
The Brain

✓ The real pathogenetic role of no-reflow phenomenon in clinical situations such as the acute stage of subarachnoid hemorrhage (SAH) is not yet known. To study this problem, we carried out the following experiment in dogs: SAH was induced by withdrawing a needle previously inserted into the internal carotid artery through a small craniectomy in the lateral base of the skull. Complete dural repair and cranioplasty was done to avoid cerebrospinal fluid leakage. Cortical cerebral blood flow (CBF) changes, measured by a double-needle type thermocouple, intracranial pressure (ICP), electroencephalogram (EEG), and sensory evoked response were monitored under controlled ventilation for 3 hours after SAH. At the end of the experiment, the brain was perfused with carbon black solution at a pressure of 120 mm Hg. The 32 episodes of SAH thus induced yielded two basic patterns of ICP changes which simulated those previously reported with human SAH. In the first pattern, reactive hyperemia was always observed, followed by complete or incomplete recovery of cerebral function. Perfusion defects were frequently seen in the thalamus, basal ganglia, and parietooccipital cortex symmetrically. In the second pattern, prolonged elevation of ICP resulted in failure of recovery of both CBF and EEG. Carbon black filled only the pial arteries and the rest of the brain was totally unperfused. From the results, the pathogenetic role of the no-reflow phenomenon in the acute stage of SAH as influencing the prognosis is strongly suspected.

Observations Made During Stretching, Tearing, and Failure of NR and SBR Loaded with Various Amounts of Carbon Black

1989 ◽  
Vol 62 (2) ◽  
pp. 288-304 ◽  
Author(s):  
Alfred Goldberg ◽  
Donald R. Lesuer ◽  
Jacob Patt
Keyword(s):  
Carbon Black ◽  
Fracture Strain ◽  
Catastrophic Failure ◽  
Failure Strength ◽  
Growth Region ◽  
Continuous Testing ◽  
Fracture Morphologies

Abstract Using a 35-mm camera with macro attachments, and focused on the tip of a cut, the stretching, tearing, and failure of notched samples of NR and SBR were documented during continuous testing. The propagation of a cut occurs by the stretching, tearing, and collapsing of fine strands, which we propose consists of bundles of long unwinding molecular chains of the rubber. Two main cut-growth regions are identified: a slow-cut-growth region consisting of irregular-shaped nodules or cells of collapsed rubber strands along short tear paths and a fast-cut-growth region consisting of long intersecting tear or cleavage paths leading to catastrophic failure. Addition of 20.6 phr (15 wt.%) carbon black results in a coarsening of the stretching, tearing, and fracture morphologies relative to those seen with the gum rubbers. Addition of 64 phr (35 wt.%) of carbon black results in all these structures being very fine with the phenomenon of knotty, deviated tearing dominating in the slow-cut-growth region. The knotty tearing is frequently revealed by the presence of chevron-like markings which correspond to the intersection of individual disoriented (deviated) tears. The initiation of tearing occurs at relatively low strains for all three carbon black loadings (0, 15, 35 wt.%); however, the strain to initiate tearing relative to the fracture strain was seen to decrease with an increase in carbon black, especially with the SBR series. Both failure strength and elongation increase significantly with carbon-black additions to SBR up to about 39 phr (25 wt.% of carbon black). With further additions, the elongation falls off, although the engineering strength remains unchanged, while the stiffness and tearing energies increase. With reference to the literature, we discuss the role of carbon black and deviated tearing on strengthening rubbers; suggestions are made for further research in this area.

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