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Dissertations / Theses on the topic 'Wet chemical method'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Arab, B., A. Shokuhfar, M. Valinejad, and A. Zolriasatein. "Uncapping Multi-Walled Carbon Nanotubes Using Wet Chemical and Oxidation Methods." Thesis, Sumy State University, 2012. http://essuir.sumdu.edu.ua/handle/123456789/35060.

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Different materials can be introduced into hollow space of carbon nanotubes and result in very useful nanostructures for different applications such as energy storage, self-healing materials, nanocomposites, etc. In this study, the multi-walled carbon nanotubes were uncapped using two methods, oxidation with carbon dioxide or oxygen at elevated temperatures, and boiling carbon nanotubes in concentrated nitric acid chemical method was found to be more effective than the oxidation method, since the number of opened nanotubes was about 60 % more than that in oxidation method. Furthermore, u

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2

Ahmad, Salimi Midhat Nabil. "Systematic investigations of calcium phosphates produced by wet chemistry method and supercritical processing techniques." Thesis, University of Birmingham, 2012. http://etheses.bham.ac.uk//id/eprint/3326/.

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Calcium phosphate (CaP) based material, especially hydroxyapatite (HAp) nanoparticles have a wide range of applications in a number of fields, such as drug delivery, gene therapy, bone cements, dental applications, chromatography and waste water remediation. Depending on the application, there is often a need for the nanoparticles to be in a particular size range. One of the potential applications of HAp is for drug delivery; as a transfection vector in specific. The main aim of this study was to evaluate the potential of various produced CaP nanoparticles for this matter. The HAp and CaP nano

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3

Onggar, Toty, Gosbert Amrhein, Anwar Abdkader, Rolf-Dieter Hund, and Chokri Cherif. "Wet-chemical method for the metallization of a para-aramid filament yarn wound on a cylindrical dyeing package." Sage, 2017. https://tud.qucosa.de/id/qucosa%3A35530.

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High-performance yarns such as aramid fibers are nowadays used to reinforce composite materials due to their advantageous physico-chemical properties and their low weight. They are also resistant to heat and fire. Para-aramid filament yarns (p-AFs) wound on a cylindrical dyeing package have been silvered successfully by means of a newly developed wetchemical filament yarn metallization process on a laboratory scale. The surface morphology of untreated and silvered p-AF was determined by means of scanning electron microscopy. The chemical structure of the surfaces (contents of carbon, oxygen, n

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4

Ndahimana, Joice, and Tammar Issa. "Method development : follow liquid distribution in real time." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-12813.

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Continuous development and improvement of the modern disposable diaper is crucial for the optimization of product performance. Several methods are used for evaluation and improvements to sustain high quality diapers being produced. The aim of this thesis was to develop a new test method that follows liquid distribution in real time by combining two pre-existing measurement systems. Rewet is the amount of liquid that returns to the surface of diapers when subjected to pressure. Distribution of absorption material is examined by exposing the product core to radiation. These two measurement syste

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5

Sudirham, Janivita Joto. "Space-time discontinuous Galerkin methods for convection-diffusion problems application to wet-chemical etching /." Enschede : University of Twente [Host], 2005. http://doc.utwente.nl/50890.

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6

Larsson, Stig. "On reaction-diffusion equation and their approximation by finite element methods /." Göteborg : Chalmers tekniska högskola, Dept. of Mathematics, 1985. http://bibpurl.oclc.org/web/32831.

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7

TOMBOLATO, SARA. "CZTS(e) thin films grown by chemical methods for photovoltaic application." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2015. http://hdl.handle.net/10281/77923.

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Le kesteriti sono una classe di semiconduttori con un band gap diretto compresa tra 1,0 e 1,5 eV e un coefficiente di assorbimento dell'ordine di 10^4 cm^ -1 nello spettro visibile e durante gli ultimi vent’anni hanno ricevuto parecchia attenzione a causa della loro potenziale applicabilità come materiali a film sottile nel fotovoltaico. Un altro calcogenuro a film sottile, il CIGS, di composizione Cu2InxGa (1-x)Se2 è già prodotto a livello industriale, ma il costante aumento del prezzo dell’ indio ha spinto la ricerca di materiali alternativi, come il CZTS(e), che sono composti solo da eleme

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8

Xu, Sheng. "Oxide nanowire arrays for energy sciences." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/42876.

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Oxide nanowire arrays are playing an important role in energy sciences nowadays, including energy harvesting, energy storage, and power management. By utilizing a wet chemical growth method, we demonstrated the capabilities of synthesizing density controlled vertical ZnO nanowire arrays on a general substrate, optimizing the aspect ratio of the vertical ZnO nanowire arrays guided by a statistical method, epitaxially growing patterned vertical ZnO nanowire arrays on inorganic substrates, epitaxially growing patterned horizontal ZnO nanowire arrays on non-polar ZnO substrates, and the lift-off o

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9

Dowler, Rhys Montgomery [Verfasser], Hans-Joachim [Akademischer Betreuer] Freund, Reinhard [Akademischer Betreuer] Schomäcker, and Michael [Akademischer Betreuer] Gradzielski. "Preparation of catalysts on model supports using wet chemical methods and the construction of a device for the in-situ measurement of sum frequency generation spectroscopy at the solid-liquid interface / Rhys Montgomery Dowler. Gutachter: Michael Gradzielski. Betreuer: Hans-Joachim Freund ; Reinhard Schomäcker." Berlin : Technische Universität Berlin, 2013. http://d-nb.info/1065665288/34.

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10

Etmannski, Tamara R. "Accounting for sustainability in Bengal : examining arsenic mitigation technologies using Process Analysis Method." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:349d4c46-1259-49c1-be2b-46f2cb394894.

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This thesis shows how the Process Analysis Method (PAM) can be applied to assess technologies used to mitigate arsenic from drinking water in rural India, using a set of sustainability indicators. Stakeholder perspectives, gathered from a fieldwork survey of 933 households in West Bengal in 2012, played a significant role in this assessment. This research found that the ‘Most Important’ issues as specified by the technology users are cost, trust, distance from their home to the clean water source (an indicator of convenience), and understanding the health effects of arsenic. It was also found

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11

Bigot, Marianne. "Biogeochimie de la matiere organique dans l'estuaire du huang he et en mer de bohai." Paris 6, 1988. http://www.theses.fr/1988PA066083.

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Etude de l'origine du comportement de la matiere organique dans l'estuaire du huang he et en mer de bohai. Trois environnements sont envisages: le fleuve, la zone de turbidite maximum, la zone marine. Des analyses d'hydrocarbures non aromatiques, d'acides gras, de lactones et d'organochlores sont menees sur les fractions dissoutes et particulaires et le sediment. Les empreintes terrigenes, anthropiques et biologiques sont discutees. L'utilisation de methodes statistiques appliquees aux acides gras permet de comprendre et confirmer l'origine de ces composes. Une evolution de la qualite de l'env

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12

Chen, Huiling, and 陳慧玲. "Preparation of Cu2ZnSnS4 Thin Filmsby Wet Chemical Method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/34389867567130376407.

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碩士<br>亞洲大學<br>光電與通訊學系碩士班<br>100<br>Cu2ZnSnS4 (CZTS) films were synthesized by wet chemical processes and then annealed under controlled argon atmosphere. This study was conducted in two stages. In the first stage, the precursor solutions were prepared in three levels of sulfur content. These films were deposited from the precursor solutions and annealed at 250 ℃ for 1 hour. The results showed that the CZTS film deposited from the sulfur content S3.0 had the better optoelectronic properties as compared to its counterparts. The optical energy gap value was 1.52 eV, and the absorption coefficient

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13

Wang, Yu-Ting, and 王佑庭. "Fabrication of Silicon Heterojunction Solar Cell by Sputtering Method and Wet-Chemical Pretreatment." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/01354766441157165661.

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碩士<br>國立中央大學<br>光電科學與工程學系<br>101<br>This research aims at the applications of boron-doped silicon thin films fabricated by rf-magnetron sputtering and wet-chemical pretreatment on silicon heterojunction solar cell (SHJ solar cell). The advantage of sputtering method is its nontoxic process. The silicon thin film deposited by sputtering method needs argon and hydrogen as the working gases and the suitable target. However the disadvantages of the sputtering method are its serious ion-bombardment and low doping efficiency. One of the solutions is to increase the distance between target and substr

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14

Guo, Huai-Ren, and 郭懷仁. "Study the crystalline phase, morphology and growth properties of TiO2 by wet-chemical method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/fmt4kb.

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碩士<br>國立東華大學<br>材料科學與工程學系<br>100<br>In this study,Preparation of the variety of TiO2 crystalline phase and morphology of the growth by the chemical solution method、hydrothermal method and solvothermal method. Analysis of the crystalline phase composition of TiO2 by X-ray diffractometer,and observe the surface morphology by scanning electron microscopy. The experimental results showed that as a precursor to TiCl3 heated to 90 ℃ by chemical solution,and control the reaction solution at pH = 1.16, through six hours the growth of the main product for Brookite phase of TiO2 particles, when the

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15

Da, Tsai Po, and 蔡伯達. "Study on the Separation of Graphene Oxides from Carbon Materials by Wet Chemical Method." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/80602914414478058544.

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碩士<br>國立屏東科技大學<br>環境工程與科學系所<br>101<br>Our previous researches have attempted to measure the graphite micro-crystals content in carbon by thermal-treated woody biomass wastes, through X-ray diffraction spectrometry. The purpose of this study was to separate graphite micro-crystals into graphene oxides from two commercial carbon materials (BCT and BCG) through the wet chemical method. The method consists of using oxygenated solvents to extract graphite crystallites from carbon to form a graphene oxide solution, and then to apply graphene oxide solution products such as: heat dissipation film and

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16

Pradhani, Neeha. "Fabrication and characterizations of zirconium based high k dielectric thin film by wet chemical method." Thesis, 2014. http://ethesis.nitrkl.ac.in/6439/1/412PH2108-10.pdf.

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Zirconium thin films on glass, single-crystal silicon p-type (100), substrates have been prepared from zirconium oxychloride octahydrate and ethanol. The resulting ZrO2 films have bandgap width 4.01 eV and average thickness of the Zirconium oxide film was estimated as 108 nm from UV-visible study.The samples morphological characterizations are done using FESEM and electrical characterizations are done using Capacitance-Voltage measurements.

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17

Chung-TaNi and 倪仲達. "Deposition and Characterization of LiCoO2 Thin Film by Wet Chemical Method for Li-ion Thin Film Battery." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/3s83k4.

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博士<br>國立成功大學<br>材料科學及工程學系碩博士班<br>101<br>Wet chemical method is one of the methods which were widely used to fabricate thin films, due to low cost, simple processing and easy to control the composition stoichiometry and desired microstructure. However, the quality of the deposited thin films was highly dependent on the nature of precursor solution. In this study, the addition of chitosan in the precursor solution was found to be an effective method for the deposition of LiCoO2 thin films. Due to the chemical bonding between chitosan and cations, Li/Co ions can be homogeneously distributed in th

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18

Tsao, Chiao-Heng, and 曹巧姮. "Fabrication of Silicon Nanowire Array Through the Metal-induced Wet Chemical Etching Method and Its Photovoltaic Properties." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/87917143123478414382.

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碩士<br>國立清華大學<br>材料科學工程學系<br>99<br>Large area SiNW arrays were successfully prepared by immersing a silicon wafer into an aqueous solution of AgNO3 and HF in an electroless metal deposition (EMD) process. However, in the process the Ag clusters easily aggregated, forming large Ag particles of various sizes, which in turn resulted in silicon wires with a large size distribution. To improve the uniformity of the SiNW arrays, uniform dispersed gold nanoparticles were used as the cathode instead, followed by the etching process using H2O2/HF solution. The growth conditions, morphologies and anti-re

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19

SHUKLA, VISHWESH. "A SIMPLE, FACILE APPROACH FOR THE LARGE SCALE SYNTHESIS OF CUO NANORODS, NANOFLOWERS AND NANOWIRES USING WET CHEMICAL ROUTE AND ITS GROWTH MECHANISM." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15072.

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We report the large scale synthesis of nanostructured copper oxide (CuO) synthesized by cost effective and simple wet chemical route. Nanorods and Nanoflowers and Nanowires have been uniformly grown on Cu foil by the oxidation of Copper. Their growth mechanism has been reported to understand the optimal parameters for controlled growth via a simple coordination self-assembly method on substrates. The composition, morphology and structural identity have been characterized by Scanning Electron Microscope (SEM), X-ray Diffraction (XRD), Energy-Dispersive X-ray spectroscopy (EDX), Fourier T

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20

Huang, Yu-Ren, and 黃昱仁. "Growing Aluminum Oxide On Rear Surface by Wet Chemical Deposition Method in the study of the Multicrystalline Silicon Solar Cell with Local Rear Contact." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/8sfygr.

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21

Hsieh, Hsien-Te, and 謝賢德. "Deaggregation of Silver Powders Assisted by Supercritical CO2, Synthesis of Silver Nanoparticles and Metal Sulfide Nanocrystals by Wet-Chemical Method Using Metal Isostearate as Precursor." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/51220620539748302790.

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博士<br>國立清華大學<br>化學工程學系<br>99<br>The main purpose of this study was to develop the techniques of the preparation of nanocrystals. In this dissertation, three techniques including (I) the deaggregation of silver powders assisted by supercritical CO2, (II) the synthesis of silver nanoparticles in CO2-expanded liquids, and (III) the synthesis of metal sulfide nanocrystals using wet-chemical method had been studied. System I. The deaggregation of silver powders assisted by supercritical CO2 The mixture of silver particles/organic solvent/dispersing agent in the reactor was pressurized with CO2 ran

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22

Chatterjee, Dipanwita. "Insights into Nucleation, Growth and Shape Control for Designing Anisotropic Nanostructures and Heterostructures." Thesis, 2018. https://etd.iisc.ac.in/handle/2005/5357.

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The properties of nanomaterials significantly depend on the size and shape of the nanocrystals. Thus the size and shape control becomes an important and interesting aspect of nanocrystal synthesis. Wet chemical method of synthesis of nanomaterials is an efficient bottom-up approach. It starts at the molecular level and the rate of the reaction can be monitored and regulated at various stages of reaction, thus enabling one to have a better control over the final morphology of the nanocrystal. In order to carry out a morphology controlled synthesis strong understanding of nucleation and growth o

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23

Lin, Han-Shun, and 林漢舜. "Mn3O4/carbon black composites prepared by wet chemical methods for super-capacitor applications." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/11013049483784812870.

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24

Jena, Hrudananda. "Ionic Transport And Structural Investigations On Selected Perovskites Synthesized By Wet Chemical Methods." Thesis, 2004. https://etd.iisc.ac.in/handle/2005/1260.

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Jena, Hrudananda. "Ionic Transport And Structural Investigations On Selected Perovskites Synthesized By Wet Chemical Methods." Thesis, 2004. http://etd.iisc.ernet.in/handle/2005/1260.

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26

Chang, Li-Wei, and 張立瑋. "Supercapacitor properties of MnO2 nanoflakes on nickel foam-graphene by hydrothermal and chemical wet methods." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/85912718335290994415.

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碩士<br>國立中興大學<br>材料科學與工程學系所<br>103<br>MnO2 nanoflakes/graphene were synthesized by hydrothermal and chemical wet methods. At first, graphene was synthesized on the nickel foam by chemical wet method. Then, MnO2 nanoflakes were synthesized on the graphene foam by hydrothermal process for comparison purpose. In comparison, MnO2 nanflakes were synthesis on the nickel foam by hydrothermal process. The samples were denoted as NG, NGM and NM, respectively. We changed the precursor concentration and synthesis time in the hydrothermal process to obtain NM and NGM to achieve the best capacitance perform

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27

Dash, Subrat. "Preparation of MgAl2O4 Spinel through Different Wet Chemical Methods and Study of its Densification Behavior." Thesis, 2016. http://ethesis.nitrkl.ac.in/8533/1/2016_MT_711CR1144_Subrat_Dash.pdf.

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MgAl2O4 spinel was prepared through three different routes, i.e. Auto-Combustion process, Citrate sol-gel process and Co-precipitation process. Spinelization was studied at three different temperatures (6000C, 7000C, 8000C) for Auto-Combustion process and Citrate sol-gel process and two different temperature (6000C, 7000C) for Co-precipitation process. Optimization was done for all the three routes to achieve phase pure spinel at lowest possible calcination temperature. Phase pure spinel was achieved at 6000C in Co-precipitation process, whereas 7000C was required to prepare phase pure spinel

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28

Jian, Bo-sung, and 簡柏崧. "Synthesis and gas sensing properties of V2O5 and CuO doped V2O5 nanowires prepared by hydrothermal and chemical wet methods." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/42873507420001033323.

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碩士<br>國立中興大學<br>材料科學與工程學系所<br>101<br>In this experiment, CuO-V2O5 heterogeneous nanostructures was synthesized by a two-stages chemical process where V2O5 nanowires were synthesized by using a hydrothermal method in the first stage, and then CuO nanoparticles were decorated on the surface of V2O5 nanowires through wet-chemical reaction in the second stage. The morphologies. compositions, and crystalline structures of the as-synthesized products were characterized by SEM, XRD, and TEM. To study the growth mechanism of V2O5 nanowires, the synthesis process was terminated at different growth tim

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29

Jye, Jou Sheng, and 周聖杰. "1. Studies on the Chemical Constituents from the Stem of Alphitonia philippinensis. 2. Analyses on the Hypoglycemic Effect of Folk Medicine, WFT.3. An Improved Oxidative Cleavage Method for Large Scale Preparation of Cycloastragenol from Radix Astragali." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/40801739962384146747.

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博士<br>國立臺灣大學<br>藥學研究所<br>91<br>英文摘要 I. Studies on the Chemical Constituents from the Stem of Alphitonia philippinensis. II. Analyses on the Hypoglycemic Effect of Folk Medicine, WFT. III. An Improved Oxidative Cleavage Method for Large Scale Preparation of Cycloastragenol from Radix Astragali. Part I： Cumulative phytochemical studies on rhamnaceous plants had indicated the presence of bioactive peptide alkaloids, benzylcoumarones, triterpenoids (saponins) and phenolic compounds. Hence we continued to investigate the chemical constituents o

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