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Petro - Theses: Recent submissions

Now showing items 1041-1060 of 1415

Effect of Ti compounds on hydrogen desorption-absorption of LiNH₂

Atsadawuth Siangsai (Chulalongkorn University, 2009)

Solid hydrogen storage materials have been investigated as hydrogen carriers due to their safety in hydrogen applications. In contrast, they also have some disadvantages, such as a low hydrogen capacity, very high ...
Kinetics of asphaltene precipitation: effect of different n-alkane precipitants

Balgoa, Arjames T (Chulalongkorn University, 2009)

Asphaltenes are a class of molecules that have a tendency to precipitate from crude oils due to changes in its solubility. Asphaltene precipitation can eventually lead to serious problems in oil production such as plugging ...
Hydrogen production via methane partial oxidation over ceria-nickel and ceria-zirconia-nickel mixed-oxide catalysts

Adinun Khamnetr (Chulalongkorn University, 2009)

Hydrogen production via the partial oxidation of light hydrocarbons has received much attention in recent years due to the high demand for clean energy sources alleviating environmental problems. An alternative means of ...
Systhesis and characterization of polyaniline nanoparticle by using template technique

Tuspon Thanpitcha (Chulalongkorn University, 2009)

Various morphologies of polyaniline (PANI) nanoparticles, including nanofibrils, dendrites, and spheres, were synthesized by oxidative polymerization of aniline in the presence of different types of templates those are ...
Polybenzoxazine-based carbon aerogel as a catalyst support : influence of support types on catalyst activity for the adsorption of 4-chlorophenol

Supanun Somlok (Chulalongkorn University, 2009)

Carbon aerogel is a mesoporous carbon material, presenting several advantages, including higher stability in both acidic and basic media, an easily turable surface chemistry, and a well-developed porosity. Polybenzoxazine ...
Development of novel carbon foam derived from phenol-ethylenediamine benzoxazine precursor

Somkiat Sreewanichwipat (Chulalongkorn University, 2009)

Carbon foam is prepared by using phenol-ehtylenediamine benzoxazine as an organic precursor and azodicarbonamide (AZD) as a blowing agent. The effects of AZD concentration and polymerization rate on the porous structure ...
Preferential oxidation of CO in a double-stage packed-bed reactor

Siwat Rujinarong (Chulalongkorn University, 2009)

Preferential oxidation (PROX) of CO is typically used to lower the CO concentration in the H₂-rich stream derived from hydrocarbon reforming. In this study, Au supported on a TiO₂ catalyst prepared by deposition-precipitation ...
Adsorptive removal of sulfur compounds from diesel using activated carbon and alumina modified with Cu(I) and Ni(II)

Sirapa Prateepamornkul (Chulalongkorn University, 2009)

This research studied the adsorptive capacity and selectivity of dibenzothiophene (DBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT) in simulated diesel fuels containing polyaromatic or nitrogen compounds on activated ...
Thermal, crystallization, and mechanical characteristics of poly(d,l-lactide) blends fibers containing antibacterial elements for biomedical applications by using melt spinning technique

Saran Suntarin (Chulalongkorn University, 2009)

Poly(d,l-lactice) (PDLLA) is biodegradable polymer which is widely used in biomedical application; but it has brittleness. This work aims to improve the properties of PDLLA by blending it with Poly [(R)-3-hydroxybutyrate ...
Development of anhydrous proton exchange membrane fuel cell (PEMFC): an investigation of molecular design and synthesis of model compounds

Puripong Totsatitpaisan (Chulalongkorn University, 2009)

Benzimidazole-based model compounds are designed and synthesized in a systematic system, i.e., mono-, di- and tri-functional compounds. The characterizations indicate the formation of well-packing structure with hydrogen ...
Novel polymer foam via polymerized high internal phase emulsion (polyHIPEs)

Pornsri Pakeyangkoon (Chulalongkorn University, 2009)

In order to obtain polyHIPE polymeric foam with improved properties for performance in ever-broadening applications i.e. adsorbent for CO₂ adsorption and scaffold for tissue engineering application, the present work focuses ...
Novel polybenzoxazine-based carbon aerogel electrode for supercapacitors

Porawee Katanyoota (Chulalongkorn University, 2009)

In this study, polybenzoxazine, a new high performance thermosetting resin, was used to prepare carbon aerogels used as an electrode for spercapacitors. Two type of polybenzoxazines, derived from two different amines, ...
Adsorption of toxic gases from gasification process by polyHIPEs

Piyada Pannak (Chulalongkorn University, 2009)

Poly(DVB)HIPEs prepared with a porogenic solvent (toluene) and 2 types of mixed surfactants (SPAN80, DDBSS, and CTAB; 6.3, 0.4, and 0.3 wt% (S80DCI) and 9.5, 0.3 and 0.2 wt% (S80DCII)). The producing poly(DVB)HIPEs exhibit ...
Biodiesel fuel production with solid catalysis in a fixed-bed reactor

Pitchaya Phanthong (Chulalongkorn University, 2009)

Nowadays, the use of heterogeneous catalysts for biodiesel production is an attractive solution because it can be separated more easily from the reaction products (biodiesel and glycerine). In this work, KOH/ZrO₂ and ...
Surface dissolution and formation and scallops

Pasit Warunphaisal (Chulalongkorn University, 2009)

Flow-assisted corrosion (FAC) is a significant problem with carbon steel components exposed to rapidly moving water or water-steam mixtures. Such components often develop distinctive patterns of surface damage producing a ...
Chitosan coating on a woven PET surface modified by DBD plasma technique for antimicrobial property improvement

Pannee Sophonvachiraporn (Chulalongkorn University, 2009)

In this study, a woven PET fabric with antimicrobial property was prepared by coating the fabric's suface with chitosan. First, hydrophilic improvement of the woven PET surface was accomplished by plasma treatment using ...
Surface modification of poly(lactic acid) fibers via aminolysis and type-l collagen immobilization for bone tissue engineering

Palita U-prasitwong (Chulalongkorn University, 2009)

By the reaction of poly (lactic acid) (PLA) in the form of electrospun fibrous membranes with 1,6-hexanediamine (HMD), free amino groups were interoduced onto PLA surface, through which a biocompatible macromolecule, ...
Electrospun cellulose acetate fiber mats containing herbal substances for drug delivery system and wound dressing applications

Orawan Suwantong (Chulalongkorn University, 2009)

Ultra-fine cellulose acetate (CA; Mw ≈ 30,000 Da; degree of acetyl substitution ≈ 2.4) fiber mate containing either curcumin (CM; from the plant Curcuma longa L.) or asiaticoside (Ac; from the plant Centella asiatica L. ...
Extrusion of admicelled natural rubber filled with nanomagnetic particles

Nuttida Srirachya (Chulalongkorn University, 2009)

Thin layers of polystyrene (PS) and poly(methyl methacrylate) (PMMA) are coated on natural rubber (NR) particles via admicellar polymerization using bilayers of cethyltrimethylammnonium bromide (CTAB) as a reaction template. ...
Isolation of cellulose-degrading bacteria from termites microcerotermes sp.

Kitipong Taechapoempol (Chulalongkorn University, 2009)

The main problem of using cellulose as a feedstock for direct bio-hydrogen production by a fermentative microorganism is the inefficiency of the process, because the hydrogenase enzyme cannot access the internal surface ...

Now showing items 1041-1060 of 1415

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