To see the other types of publications on this topic, follow the link: Cetyltrimethylammonium bromide.
Dissertations / Theses on the topic 'Cetyltrimethylammonium bromide'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 18 dissertations / theses for your research on the topic 'Cetyltrimethylammonium bromide.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
1
Mills, Amanda Jayne. "Investigating cetyltrimethylammonium bromide (CTAB) reverse microemulsions using nuclear magnetic resonance." Thesis, University of Birmingham, 2016. http://etheses.bham.ac.uk//id/eprint/6528/.
Full textAbstract:
This thesis investigates CTAB/alcohol/hexane/water reverse micelles, where the alcohol is butanol, pentanol, hexanol and heptanol, through the use of nuclear magnetic resonance (NMR). Diffusion and relaxation measurements showed the alcohol is distributed between the reverse micelle (RM) interface and the continuous phase, and exchanges between these two environments. The exchange of pentanol in the CTAB/pentanol/hexane/water RM was investigated using 20 relaxation exchange spectroscopy (REXSY), and was determined to be on the order of milliseconds. The proportion of alcohol in the interface was determined for all microemulsions which decreases as a function of increasing alcohol size. Each microemulsion was investigated by molecular simulations which produced oblate shaped droplets, which was associated with a non-homogeneous distribution of alcohol in the interface. CTAB was determined to be present in solely the interface of the microemulsions with the exception of the CTAB/pentanol/hexane/water RM. The CTAB/pentanol/hexane/water RM behaves differently as initially the CTAB was distributed between the RM and the continuous phase however, after time, the surfactant is re-distributed so that CTAB is present in only the interface. The RM sizes were determined using the CTAB diffusion coefficients. The droplet sizes decreased as a function of alcohol chain length, with the exception of the CTAB/pentanol/hexane/water RM which, after time, gave the largest droplet of all the microemulsions.
2
Velcer, Tomáš. "Hyaluronanové hydrogely na bázi CTAT." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2016. http://www.nusl.cz/ntk/nusl-240558.
Full textAbstract:
This thesis studies the properties and behaviour of phase-separated hydrogels prepared by interaction of hyaluronan with oppositely charged surfactants. Three representatives of surfactants, namely cetyltrimethylammonium bromide, chloride and p-toluensulfonate (CTAB, CTAC, CTAT), were selected for comparison. Using the method of rheology, the fact that the system of Hya-CTAT forms the most rigid hydrogels has been proved. Higher molecular weight of hyaluronan has also direct influence on the volume and stiffness of the newly formed hydrogels. Preparation methods were compared as well. Mixing the stock solutions of entry components appeard to be the most suitable. Small-angle X-ray scattering was used for determination of shape and size of surfactant's micelles, concluding that it has no effect on the volume of formed gels. The results of this study indicate that given gels are to a certain extent competitive and incorporation of hyaluronan into their structure is desirable with respect to its biological activity. This offers a potential usage of these substances in the field of medical applications.
3
Kábrtová, Petra. "Pokročilé mikroreologické techniky ve výzkumu hydrogelů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2017. http://www.nusl.cz/ntk/nusl-316186.
Full textAbstract:
This diploma thesis deals with the use of fluorescence correlation spectroscopy technique for microrheological characterization of hydrogel in a system of hyaluronate-cetyltrimethylammonium bromide. Fluorescently labelled particles were used for microrheological FCS analysis. To optimize the method the most appropriate size of particles was chosen on the basis of Newtonian glycerol solutions analysis. Among other things, the discussion was focused on the influence of refractive index change of analysed solutions on analysis results. After hyaluronate solutions analysis it was possible to assess the biopolymer concentration and molecular weight impact on the FCS microrheology results, which could then be compared with analysis results of model hydrogels of hyaluronate and CTAB. Finally, usability and limitations of FCS microrheology have been discussed.
4
Schimann, Hubert C. R. "Force and Energy Measurement of Bubble-Particle Detachment." Thesis, Virginia Tech, 2004. http://hdl.handle.net/10919/9963.
Full textAbstract:
Possibilities for increasing the upper limit of floatable particle sizs in the froth flotation process have been examined since the early beginnings of mineral flotation. The economic implications of such an incresae are far ranging; from decreased grinding costs and increased recoveries to simplified flow-sheet design and increased throughput, all leading to increased revenue. Bubble-particle detachment has been studied to better understand the factors influencing the strength of attachment and the energies involved. Direct measurements of bubble particle detachment were performed using a hanging balance apparatus (KSV Sigma 70 tensiometer) and using a submerged hydrophobic plate in water. Three experiments were used; direct force measurement of bubble-particle detachment, detachment force and energy of a bubble from a submerged hydrophobic plate, and detachment force and energy of a cetyltrimethylammonium bromide coated silica sphere from a flat bubble. Octadecyltrichlorosilane was used as a hydrophobic coating in the first two experimental methods. These experiments were recorded with a CCD camera to identify the detachment processes involved. Energies for both methods were calculated and divided into the two main steps of the detachment process: Three-Phase-Contact pinning and three phase contact line sliding. The first step represents the energy barrier which must be overcome before detachment can begin. It is directly related to contact angle hysteresis. Detachment occurs during the second step, where the solid-vapor interface is replaced by solid-liquid and liquid-vapor. This step corresponds to the work of adhesion. The effects of surface tension, contact angle and hysteresis were well demonstrated with the three experimental methods. Good correlation was found between theoretical work of adhesion and measured energies.<br>Master of Science
5
Mušková, Alexandra. "Příprava a charakterizace katanionických komplexů." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-414179.
Full textAbstract:
The diploma thesis deals with the preparation and characterization of catanionic complexes and their possible application to pharmaceutics and medicine. The catanionic complexes were prepared by mixing two oppositely charged surfactants with the concentration of 20 mmol·dm3 in various volume ratios. Two systems were analyzed – CTAB + SDS and Septonex + SDS. Both systems were prepared in an aqueous and physiological environment. The turbidimetric analyses provided results of the intensity of turbidity of the prepared mixtures. The size and stability of the prepared particles were determined by DLS and ELS measurements. CTAB-rich samples showed significant viscosity changes and they were therefore characterized by rheological measurements. The results of this work show that the asymmetry of alkyl chains, surfactant selection, temperature, and ionic strength have a significant influence on the properties and self-assembly of surfactants in catanionic complexes.
6
Venerová, Tereza. "Interakce hyaluronanu a amfifilních molekul." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2013. http://www.nusl.cz/ntk/nusl-233374.
Full textAbstract:
This work is focused on interaction between hyaluronan (Hya) and amphiphilic molecules. Using fluorescent probes method were carried out screening of the interaction of various surfactants with Hya. For further examination was chosen cetyltrimethylammonium bromide (CTAB). Interactions in this system have also been studied using fluorescence correlation spectroscopy (FCS), and additionally were performed initial tests of the cytotoxicity of the system. As an alternative CTAB were also used hydrophobically modified amino acids. Results showed their self-aggregation, but their interactions with hylauronanem was not as strong as with CTAB. The interaction of gel systems Hya-CTAB have also been studied, and was found to contain a hydrophobic domain capable solubilize hydrophobic substance. Thermogravimetric have been established that are able to contain up to 98% wt. water and rheologically were characterized their mechanical properties. These are tunable due to molecular weight (MW) of the hyaluronate. With increasing value of MW increases mechanical strength of the gel and decreases its fluidity.
7
Holubová, Anna. "Difúze organických molekul v hydrogelovém prostředí." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2017. http://www.nusl.cz/ntk/nusl-316187.
Full textAbstract:
This diploma thesis deals with study of hydrogels formed by phase separation of hyaluronan with oppositely charged surfactants cetyltrimethylammonium bromide (CTAB) and Septonex. It follows the bachelor thesis and extends the knowledge about the detailed characterisation of the inner environment of the hydrogel by determining the diffusion behaviour of the fluorescent probes Atto 488 and Nile Red using fluorescence correlation spectroscopy (FCS) technique and its modified version dual-focus fluorescence correlation spectroscopy (2f-FCS). Compared results showed that both methods show similar values and probes specifically interact with CTAB but Atto 488 shows only weak interaction with Septonex compared to Nile Red. Additionally, these interactions were not affected by the molecular weight of hyaluronan. In conclusion, it was recommended to measure this type of hydrogel in a small depth of gel using a conventional method.
8
Repová, Romana. "Studium interakce záporně nabitých vezikulárních systémů s polykationty." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-414178.
Full textAbstract:
This diploma thesis deals with the preparation and characterization of negatively charged catanionic vesicular systems and their combination with selected polycations. The catanionic vesicular system was prepared by mixing of two oppositely charged surfactants SDS and CTAB. The negative charge as well as the stability of the vesicular system was provided by the incorporation of phosphatidic acid. Polycations, DEAE and TMC, have been selected for use in a pharmaceutical applications. Characterization of the prepared systems was performed by measuring DLS and ELS. The results indicate that we were able to prepare stable negatively charged vesicles that were eligible to non-covalently interact with selected polycations.
9
Mondek, Jakub. "Časově rozlišená fluorescence systémů polymer-tenzid." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2012. http://www.nusl.cz/ntk/nusl-216815.
Full textAbstract:
In this diploma thesis was studied time-resolved fluorescence in polymer-surfactant system. At first aggregation numbers of cationic (cetyltrimethylammonium bromide), anionic (sodium dodecylsulfate) and nonionic (Triton X-100) surfactants were studied by steady-state and time-resolved fluorescence spectroscopy. These two methods were compared. Aggregation numbers by steady-state method were always lower than aggregation numbers measured by time-resolved method. Steady-state method of determination aggregation numbers is useless for surfactants with high aggregation number and for aerated samples. Addition of hyaluronan to surfactant system was studied. There was observed change in aggregation number after addition of hyaluronan and change in percentage of dynamic quenching after addition of hyaluronan. Hyaluronan affected aggregation number of cetyltrimethylammonium bromide and Triton X-100. Hyaluronan increased percentage of dynamic quenching in cetyltrimethylammonium bromide and in Triton X-100. Pyren in sodium dodecylsulfate was quenched by sphere of action with negligible percentage of dynamic quenching and addition of hyaluronan had no effect on quenching. As next goal of this thesis, the determination of the position of fluorescence probe pyrene in cetyltrimethylammonium bromide, sodium dodecylsulfate and Triton X-100 micelles was chosen. Position of pyrene changed with charge and structure of micelles. Next was studied how percentage of dynamic quenching by iodide compounds changes with different charge of micelle. In all cases majority of dynamic quenching was calculated.
10
Kotouček, Jan. "Charakterizace koloidních částic pomocí deprotonace v excitovaném stavu za použití pokročilých fluorescenčních technik." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2016. http://www.nusl.cz/ntk/nusl-240582.
Full textAbstract:
The deprotonation characteristics of fluorescent probes -naphthol and 8-hydroxypyrene-1,3,6-trisulphonic acid (HPTS) were studied in this diploma thesis, using steady-state and time-resolved fluorescence spectroscopy. Two cationic surfactants, Septonex and cetyltrimethylammonium bromide (CTAB), were studied. These surfactants were measured in the complex with hyaluronan (1.75 MDa, 1 MDa and 300 kDa). Steady-state fluorescence was used for determination of critical aggregation concentration of each surfactant and pKa*. Time-resolved fluorescence decays were used to calculate the average lifetimes and the deprotonation constants of naphthol and HPTS. The measurement with hyaluronan were compared with the polystyrenesulfonate (PSS) – surfactant system. The effect of hydration shell of hyaluronan on hyaluronan – surfactant complex formation results from the comparison of above mentioned systems. Large differences were found in the deprotonation characteristic between surfactants and even between individual molecular weights of hyaluronan. The measurement shows that the hydration shell is located near to the dissociated carboxyl groups of hyaluronan chain, where the interaction with the positively charged surfactants occurs. Furthermore, the aggregation number of Septonex was determined by quenching of pyrene using cetylpyridinium chloride (CPC) as a quencher. The aggregation number for 20 mM Septonex solution was determined as a value of 104 molecules. CPC was used for confirmation of the localization of -naphthol in the micelles of CTAB and polymer – CTAB, respectively.
11
Belmajdoub, Abdelaly. "Étude comparative des systèmes micellaires bromure de cetyltrimethylammonium/eau lourde et bromure de cétyltriméthylammonium/fromamide par relaxation magnétique nucléaire multichamp/multifréquence des isotopes **(1)H, **(2)H, **(14)N, **(13)C, et **(17)O." Nancy 1, 1988. http://www.theses.fr/1988NAN10250.
Full textAbstract:
Études des propriétés du formamide en tant que substitut de l'eau dans les systèmes micellaires et les phases lyotropes et description quantitative de l'agrégation des tensioactifs en solution non aqueuse
12
Figueiredo, Douglas Borges de. "Desenvolvimento do processo de purificação da proteína A de superfície de pneumococo do clado 4 (PspA4Pro)." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/87/87131/tde-22102018-152147/.
Full textAbstract:
A proteína A de superfície de pneumococo (PspA) é encontrada na superfície de todas as cepas de Streptococcus pneumoniae e candidata promissora para novas vacinas pneumocócicas. Foi desenvolvido um processo de purificação da PspA4Pro cujas etapas iniciais foram: ruptura da biomassa celular, precipitação do homogenato obtido com o detergente brometo de cetiltrimetilamônio (CTAB) e remoção do precipitado por centrifugação. Foram avaliadas cromatografias de troca iônica (aniônica, catiônica), afinidade por metais, interação hidrofóbica e mista de troca catiônica e hidrofóbica. Utilizando precipitação com CTAB, cromatografia de troca aniônica, crioprecipitação em pH4,0 e cromatografia de troca catiônica atingiu-se a pureza requerida de PspA4Pro (>95%) com recuperação entre 14% e 33%. O processo alcançou níveis aceitáveis de endotoxina no produto final e a PspA4Pro purificada foi reconhecida por anticorpos anti-PspA4, manteve sua atividade e sua estrutura secundária.<br>Pneumococcal surface protein A (PspA) is found in all Streptococcus pneumoniae strains and is a promising candidate to be used in new pneumococcal vaccines. A purification process for PspA4Pro which inicial steps were: cell disruption, precipitation of the homogenate with the cationic detergent cetyltrimethylammonium bromide (CTAB) and pellet removal by centrifugation. The chromatographic techniques tested were ion exchange (anionic and cationic), immobilized metal affinity, hydrophobic interaction and mix mode with hydrophobic and cationic ligands. Using CTAB precipitation, anion exchange chromatography, crioprecipitation in pH4.0 and cation exchange chromatography the PspA reached the required purity (>95%) with recovery between 14% and 33% . The process reached acceptable levels of endotoxin in the final product and the purified PspA4Pro was recognized by anti-PspA4 antibodies and manteined its activity and secondary structure.
13
HEISH, MING-JEN, and 謝明仁. "Synthesis and Characterization of FePt/ Kaolinite Modified Cetyltrimethylammonium Bromide Nanocomposites." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/e8uxkn.
Full textAbstract:
碩士<br>國立臺北科技大學<br>製造科技研究所<br>107<br>In this study, FePt nanoparticles (NPs)/ Kaolinite modified cetyltrimethylammonium bromide (Kaolinite modified CTAB) nanocomposites have been synthesized via a simple process by using one-pot method. Triethylene glycol (TEG) functions as both solvent and reductant, whereas Kaolinite modified CTAB provide anchoring sites for the nucleation growth of FePt NPs. The composition, microstructure, magnetic property and surface morphology of the FePt /Kaolinite-CTAB nanocomposites are methodically characterized by FT-IR, XRD, SEM, UV/VIS spectroscopy, MRI, VSM, high-frequency heater, and potentiostat. From the above analysis results, it can be observed that the diffraction peak of Kaolinite modified CTAB and FePt in the XRD pattern. From the FT-IR spectrum, C-O, C=C, -OH, and C-H, were observed respectively. The saturation magnetization (Ms) of FePt NPs was 17.27 emu/g. The results show that the Ms of FePt /Kaolinite-CTAB nanocomposites have been increased through the addition of Kaolinite modified CTAB. The healing response of hydrophilic FePt /Kaolinite-CTAB nanocomposites was measured by the high-frequency heater, the results from Magnetic Resonance Imaging suggest that FePt /Kaolinite-CTAB nanocomposites can be used as potential contrast agents, besides, the FePt /Kaolinite-CTAB nanocomposites exhibit multifunction. Analysis of physical adsorption properties of dyes can be observed by UV/VIS spectroscopy.
14
Huang, Yao-Hui, and 黃耀輝. "Structures and Properties of Cetyltrimethylammonium bromide Templated Low-dielectric-constant materials." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/86429420713294836225.
Full textAbstract:
碩士<br>國立交通大學<br>材料科學與工程學系所<br>102<br>Smaller and well dispersed pores create better mechanical properties. In the study, Cetyltrimethylammonium bromide (CTAB) is selected as pore generator (porogen) because of the high surface zeta potential (~100mV) and long range order arrangement in TEOS system. Furthermore, the structure-property relationships of Methyltrimethoxysilane (MTMS)/ Tetraethylorthosilicate (TEOS)/ CTAB hybrid thin films are examined and compared to TEOS/CTAB system.
The MTMS/TEOS hybrid films are combined with the molar ratio MTMS/TEOS=3. The more terminal group (Si-CH3) in the film the lower dielectric constant can be achieved. However, the formation of micelles is hindered and the arrangement is also impeded by the methyl group. Therefore, micelles/pore with long range order structure cannot be obtained but size only increase slightly after curing process in the thin film which can be observed from grazing incidence small angle X-ray scattering (GISAXS). In addition, the residual of silanol groups (Si-OH) decrease with increasing CTAB after curing process due to CTAB is benefit the condensation reaction of siloxane. The influence is benefit structures and properties will elaborate in the following sections.
15
Chung, Yi-Lung, and 鍾乙榮. "Synthesis and characterization of FePt/ Montmorillonite modified cetyltrimethylammonium bromide (MMT modified CTAB) nanocomposites." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/235rm9.
Full textAbstract:
碩士<br>國立臺北科技大學<br>機械工程系機電整合碩士班<br>106<br>In this study, FePt nanoparticles (NPs)/ Montmorillonite modified cetyltrimethylammonium bromide (MMT modified CTAB) nanocomposites have been synthesized via a simple process by using one-pot method. Triethylene glycol (TEG) functions as both solvent and reductant, whereas MMT modified CTAB provide anchoring sites for the nucleation growth of FePt NPs. The microstructure, composition, surface morphology and magnetic property of the FePt /MMT-CTAB nanocomposites are methodically characterized by XRD, FT-IR, SEM, TEM, TGA, UV/VIS spectroscopy, MRI, VSM, high-frequency heater and potentiostat. From the above analysis results, it can be observed that the diffraction peak of MMT modified CTAB and FePt in the XRD pattern. From the FT-IR spectrum, -OH, C-H, C-O and C=C were observed respectively. The saturation magnetization (Ms) of FePt NPs was 14.67 emu/g. The results show that the Ms of FePt /MMT-CTAB nanocomposites have been increased through the addition of MMT modified CTAB. The heating response of hydrophilic FePt /MMT-CTAB nanocomposites was measured by high-frequency heater, The results from Magnetic Resonance Imaging suggest that FePt /MMT-CTAB nanocomposites can be used as potential contrast agents, besides, the FePt /MMT-CTAB nanocomposites exhibit multifunctions. Analysis of physical adsorption properties of dyes can be observed by UV/VIS spectroscopy.
16
Huang, Yu-Ting, and 黃裕婷. "Alleviation of Ion Suppression in Capillary Electrophoresis / Electrospray Ionization Mass Spectrometry Using Cetyltrimethylammonium Bromide Containing Buffer." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/20559112375104870334.
Full textAbstract:
碩士<br>臺灣大學<br>化學研究所<br>98<br>Analyzing low-molecular organic acid by capillary electrophoresis usually adds cationic surfactant such as cetyltrimethylammonium bromide（CTAB）in the running buffer. Dynamic coating CTAB on capillary can reverse the EOF, thus reducing the analysis time and ensuring all analytes could be detected. However, CTAB will reduce the sensitivity of organic acid and pollute the ion source of the mass spectrometer seriously. This research uses liquid-junction/low-flow interface in combination with the PTFE connecting column to prevent the CTA(cetyltrimethylammonium) cation enter the ESI source as well as the signal suppression of the analyte. Under reversed polarity and CTAB dynamic coating, the EOF and the analyte with negative charge all moved toward the detection side. However, without the adding CTAB, the EOF and the analyte were moved in the opposite directions in the connecting column. Thus, we use PTFE tube to reduce the EOF to let the mobility of the analyte can be larger than that of the EOF. And the analyte can reach the detection side at the same time the CTA cation will be staied in the liquid junction because of its positive charge. The experimental results shown that while the concentration of the analyte is 50 ppm, the system with low-flow interface cannot detect the analyte, but the system with liquid-junction/low-flow interface in combination with the PTFE connecting column successfully detected all the analytes.
Moreover, CTAB can also be used in the peptide separation in capillary electrophoresis. Better separation efficiency of similar peptides was achieved under the conditions of micellar electrokinetic chromatography（MEKC）. So we added high concentration CTAB into the buffer to separate the tryptic-digested peptides of myoglobin by MEKC. The experimental results showed that even though the separation of peptides with similar m/z was improved by MEKC. However, there was still no significant benefit obtained in the separation of overall digested peptides of myoglobin.
17
Dvoracek, Charlene M. "Antimicrobial Activity of Cationic Antiseptics in Layer-by-Layer Thin Film Assemblies." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-517.
Full textAbstract:
Layer-by-layer (LbL) assembly has proven to be a powerful technique for
assembling thin films with a variety of properties including electrochromic, molecular
sensing, oxygen barrier, and antimicrobial. LbL involves the deposition of alternating
cationic and anionic ingredients from solution, utilizing the electrostatic charges to
develop multilayer films. The present work incorporates cationic antimicrobial agents
into the positively-charged layers of LbL assemblies. When these thin films are exposed
to a humid environment, the antimicrobial molecules readily diffuse out and prevent
bacterial growth. The influence of exposure time, testing temperature, secondary
ingredients and number of bilayers on antimicrobial efficacy is evaluated here.
Additionally, film growth and microstructure are analyzed to better understand the
behavior of these films.
The antimicrobial used here is a positively-charged quaternary ammonium
molecule (e.g. cetyltrimethylammonium bromide [CTAB]) that allow assemblies to be
made with or without an additional polycation like polydiallyldimethylamine. While
films without this additional polymer are effective, they do not have the longevity or uniformity of films prepared with its addition. All of the recipes studied show linear
growth as a function of the number of bilayers deposited and this growth is relatively
thick (i.e. > 100 nm per bilayer). In general, 10-bilayer films prepared with CTAB and
poly(acrylic acid) are able to achieve a 2.3 mm zone of inhibition against S. aureus
bacteria and 1.3 mm against E. coli when test are conducted at body temperature (i.e.
37oC). Fewer bilayers reduces efficacy, but lower test temperatures improve zones of
inhibition. As long as they are stored in a dry atmosphere, antimicrobial efficacy was
found to persist even when films were used four weeks after being prepared. The best
films remain effective (i.e. antimicrobially active) for 4-6 days of constant exposure to
bacteria-swabbed plates. This technology holds promise for use in transparent wound
bandages and temporary surface sterilization.
18
童冠韋. "Surface and Protein Adsorption Properties of 316L Stainless Steel Modified by Polyvinyl Alcohol and Plasma-Treated Polyvinyl Alcohol Films and Surface Modification of Graphite Rod Electrodes by Cetyltrimethylammonium Bromide for Microbial Fuel Cells." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/d5jd9z.
Full textAbstract:
碩士<br>國立宜蘭大學<br>化學工程與材料工程學系碩士班<br>107<br>The first part of this study is to investigate the surface and protein adsorption properties of 316L stainless steels coated with polyvinyl alcohol (PVA) and N2-plasma-modified PVA films. The water contact angle of the 316L stainless steel significantly decreased after the coating with the PVA film owing to the abundant hydrophilic functional groups formed on the surface of the PVA film. The signal of the hydrophilic functional groups of the PVA film became more significant after the N2 plasma modification, leading to a further decrease in the water contact angle of the PVA film. Electrochemical tests showed that the corrosion resistance of the 316L stainless steel improved by the coating of the PVA and N2-plasma-modified PVA films. Bicinchoninic-acid protein assay results showed that the 316L stainless steels coated with the PVA and N2-plasma-modified PVA films exhibited lower bovine serum albumin concentrations than that of the neat 316L stainless steel, indicating that the anticoagulant properties of the 316L stainless steel surface could be improved after the coating with the PVA and plasma-modified PVA films. The second part of the study is to investigate the surface and electrochemical properties of the graphite rod electrodes surface-modified by soaking in a cetyltrimethylammonium bromide (CTAB) solution followed by plasma-treatment. Water contact angle measurement results show that the surface of the graphite rod electrode becomes highly hydrophilic after modified by CTAB and plasma, which is promising for the biosorption on the anode electrodes of MFCs. Electrochemical measurements show that the power density generated from the MFC configured with graphite rod modified by CTAB and plasma is higher that of the MFC configured with untreated graphite rod electrode. Surface modification of graphite rod by CTAB and plasma is a non-toxic, rapid, and cost-effective process, making it promising for the fabrication of large-scale MFCs