Papers by Angela Santiago
There is an unmet need for efficient and environmentally-friendly ultrathin energy storage device... more There is an unmet need for efficient and environmentally-friendly ultrathin energy storage devices. Here we report a thin and flexible energy storage mechanism using electrically conductive polymer (ECPs) polypyrrole and atomically thin material and a highly conductive allotrope of carbon graphene which is coated on thin paper substrate made from cladophora aegagropila algae cellulose. The cyclic voltammetry data exhibits a capacitive behavior of the device, as do the multimeter readings of the voltage while charging and discharging exhibit a battery performance. The device demonstrated hybrid characteristics in which graphene behaved as an electrochemical double layer capacitance (EDLC) and PPy behaved as a pseudo-capacitor. With significant mechanical strength and flexibility, the device shows good power density, higher charge discharge cycles, and lower self discharge rates. TEM and SEM images show well dispersion of graphene on the surface of cellulose fibers. In order to decrea...
Aiming at the demand of industrial structure optimization in Tongliang district of Chongqing from... more Aiming at the demand of industrial structure optimization in Tongliang district of Chongqing from the innovation-driven perspective, through investigation and literature search, from 2016, 2017 and 2018 respectively, the present situation of industrial structure in the district is analyzed, on this basis, the characteristics of existing industrial structure in the district are discussed, including the advantages, shortages and the industry comparison with surrounding areas & counties, based on an innovation-driven strategy, the countermeasure on industrial structure optimization in Tongliang district is put forward.
Asee Northeast Section Conference 2013, Feb 27, 2013
The carbon nanotubes (CNT) were able to show electrophoretic movement when exposed to DC field, i... more The carbon nanotubes (CNT) were able to show electrophoretic movement when exposed to DC field, in polymer gel matrix. The objective of this study is to investigate the electrophoretic alignment of the Multi-Walled Carbon nanotubes through the Poly Vinyl Alcohol slime, when exposed to DC field, using the Gel Electrophoresis technique. We report that, the Poly vinyl alcohol (PVA) gel, which is formed by the cross linking of sodium tetra borate decahydrate with PVA chains, supports the electrophoretic movement of the CNTs under the electric field. The mobility of the carbon nanotubes varies with change in the concentration of the gel and also the amount of voltage supplied to the entire system of Electrophoresis. Carbon nanotubes have been migrated to the anode end when the voltage is gradually increased. When the concentration of the gel was increased, the mobility of the carbon nanotubes was slightly decreased. To evaluate the alignment, the cyclic voltammetry (CV) study was performed on the neat PVA gel and CNT aligned PVA gel. The electrophoretic alignment of the CNTs in the polymer gel provides information about mobility of the nanotubes. The electrophoretic behavior of CNTS is helpful in using the CNTs in MEMS channels. Keywords: Multi-walled carbon nanotubes, Poly vinyl alcohol slime, Gel Electrophoresis, Cyclic Voltammetry.
Scientific Reports, 2015
Supercapacitors also known as electrochemical capacitors, that store energy via either Faradaic o... more Supercapacitors also known as electrochemical capacitors, that store energy via either Faradaic or non-Faradaic processes, have recently grown popularity mainly because they complement and can even replace, conventional energy storage systems in variety of applications. Supercapacitor performance can be improved significantly by developing new nanocomposite electrodes which utilizes both the energy storage processes simultaneously. Here we report, fabrication of the freestanding hybrid electrodes, by incorporating graphene and carbon nanotubes (CNT) in pyrrole monomer via its in-situ polymerization. At the scan rate of 5 mV s−1, the specific capacitance of the polypyrrole-CNT-graphene (PCG) electrode film was 453 F g−1 with ultrahigh energy and power density of 62.96 W h kg−1 and 566.66 W kg−1 respectively, as shown in the Ragone plot. A nanofibrous membrane was electrospun and effectively used as a separator in the supercapacitor. Four supercapacitors were assembled in series to de...
Electrospinning is a versatile tool for the formation of nanofibers from the materials of diverse... more Electrospinning is a versatile tool for the formation of nanofibers from the materials of diverse origin like organic polymers, ceramics, and polymers/ceramics composites. Here we demonstrate the formation of Polyvinyl Alcohol (PVA) nanofibers with an average diameter in the range of 60 nm to 150 nm. The FTIR data gives the presence of PolyvinylAlcohol (PVA) and their chemical bonding. The structure and the alignment of the nanofibers were observed using Scanning Electron Microscope (SEM).
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Papers by Angela Santiago