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Petro - Theses: Recent submissions

Now showing items 421-440 of 1415

Electrospun chitosan fibers for nerve regeneration

Pakakrong Sangsanoh (Chulalongkorn University, 2006)

Electrospinning of chitosan, a naturally-available polysaccharide obtained from N-deacetylation of chitin, to arrive at a nanofibrous scaffold for nerve tissue engineering, was investigated. The average diameter of chitosan ...
Sulfur in tire-derived oils and modified catalysts for sulfur reduction

Pasinee Saeng-arayakul (Chulalongkorn University, 2013)

A number of contaminating sulfur compounds of about 1.4-1.5 wt% in tire-derived oils are a problem of not only the oil properties but also environmental regulations. This reason leads to the development of strategies for ...
Effects of salinity on microemulsion based monoglyceride oily soil detergency using an extended surfactant

Nuntapron Trisinsomboon (Chulalongkorn University, 2013)

The objective of this research was to apply a microemulsion-based formation with low salinity for oily soil detergency for monoglyceride removal from fabrics. To form middle phase microemulsions (Winsor Type III), three ...
Glucose production from corncob by microbial hydrolysis using bacteria isolated from thai higher termites

Nattawut Hokittikul (Chulalongkorn University, 2013)

Microbial hydrolysis of corncob to glucose by cellulase-producing bacteria (Bacillus subtilis) isolated from Thai higher termites, Microcerotermes sp., was investigated. Corncob consists of 43.82% cellulose, 39.62% ...
Aerogel from eggshell for artificial bone

Kriangkrai Chaikul (Chulalongkorn University, 2013)

Eggshell, bio waste, is mainly composed of calcium compound which can then be applied for bone application. Bone is a natural composite material, consisting of inorganic and organic materials. The inorganic part is calcium ...
Humic coated polybenzoxazine xerogel for copper removal

Kanokporn Wongthai (Chulalongkorn University, 2013)

A polybenzoxazine xerogel was synthesized from bisphenol-A, formaldehyde, and aromatic diamine. FTIR, DSC, TGA, measurements were used to characterize the properties of the polybenzoxazine xerogel. SEM micrograph showed ...
Crystallization of m-chloronitrobenzene in the presence of adsorbents

Sasikarn Yairit (Chulalongkorn University, 2011)

Chloronitrobenzenes or CNBs, isomeric substances, consisting of o-, m-and p-CNB, are used as an important starting material in chemical production. This work explored the possibility of enhancing the CNBs separation through ...
Poly(vinylidene fluoride)/bacterial cellulose nanocomposite films for touch sensor applications

Kamonchanok O-Rak (Chulalongkorn University, 2013)

Flexible piezoelectric films of poly(vinylidene fluoride) (PVDF)/bacterial cellulose (BC) were successfully fabricated via solvent-casted and compression methods. The various weight percentage of BC (2.5-40 wt%) loading ...
Deoxygenation of beef fat for the production of hydrogenated biodiesel over Pd and NiMo catalysts : effect of catalyst support

Rutkorn Chinsutthi (Chulalongkorn University, 2011)

Hydrogenated biodiesel is one of the biofuels not containing oxygen in its molecules. The absence of oxygen leads to many advantages such as high cetane number, high heating value, and high miscibility with fossil fuels. ...
Designing microstructure of nanoporous carbon as a catalyst support for biodiesel production

Juta Jaroonkiattikhun (Chulalongkorn University, 2013)

Nanoporous carbon materials prepared from polybenzoxazine precursor have been used as catalyst supports for biodiesel upgrading. In this study, polybenzoxazine was synthesized from 1,6-hexamethylene diamine, bisphenol-A, ...
Enhancement of hydrophilicity on hydrophobic polyHIPE materials by layer-by-layer technique

Jitima Preechawong (Chulalongkorn University, 2013)

Poly(High Internal Phase Emulsion)(PolyHIPE) materials were prepared by the copolymerization of the continuous phase of polystyrene (S) and polydivinylbenzene(DVB). The microporous surface of the obtained hydrophobic ...
Development of capillary flow technique to investigate the mechanism of barium sulfate deposition

Ratchapum Charoenthaipanich (Chulalongkorn University, 2011)

Barium sulfate (BaSO₄) deposition is a significant and costly problem in oilfields which can occur when two incompatible waters mix. The precipitation of barium sulfate normally occurs in the bulk solution but for the ...
Comparision of different pretreatments and optimization of simultaneous saccharification and fermentation in biobutanol production using corncobs

Jirakarn Nantapipat (Chulalongkorn University, 2013)

Corncobs are one of the potential Thailand's agricultural biomass feedstocks for renewable energy, like biobutanol. Dilute sulfuric and phosphoric acid pretreatments have been successful developed for pretreatment to remove ...
Preparation and characterization of cellulose whisker/chitin whisker/silk sericin bionanocomposite sponges for wound dressing application

Pimnattha Ang-Atikarnkul (Chulalongkorn University, 2011)

A new dressing material composing of biopolymers derived from abundant natural resources found in Thailand was prepared. The material is in the form of a sponge composing of nanofibers of cellulose and chitin (which are ...
Morphological study of electrospun polybenzoxazine blended with poly(ethylene oxide)

Phitchaporn Sukcharoen (Chulalongkorn University, 2011)

In this work, polybenzoxazine (PBZ) based electrospun nanofibers were fabricated with the help of poly (ethylene oxide) (PEO) by electrospinning technique. The influence of PED on the electrospinnability of the BZ solution, ...
Morphological and electrochemical study of iron oxide/carbon xerogel nanocomposites for supercapacitor

Pattheera Hongsumreong (Chulalongkorn University, 2011)

A hybrid composite electrode for supercapacitor has been prepared from iron oxide and nanoporous carbon derived from polybenzoxazine. First, porous polybenzoxazine was prepared through a sol-gel process before pyrolysis ...
Synthesis and characterization of poly(2,5-dimethoxyaniline) for use as an electrochromic smart materials

Patcharin Mungkalodom (Chulalongkorn University, 2011)

Colors of electrochromic smart materials are reversible when burst of charges are applied. These materials are widely used in displays, automotive industry, smart windows, and architecture. Ploy (2, 5-dimethoxyaniline) or ...
Two-stage microwave/chemical pretreatment process of miscanthus sinensis for monomeric sugar production

Panutchakorn Boonmanumsin (Chulalongkorn University, 2011)

A two-stage biomass pretreatment process – a combination of ammonium hydroxide (NH₄OH) and phosphoric acid (H₃PO₄) pretreatments – is experimentally studied via microwave hydrothermal treatment to remove lignin and to ...
Chitosan-magnetite nanoparticles via "Click" chemistry

Oraphan Phuangsawai (Chulalongkorn University, 2011)

Chitosan-magnetite nanoparticles are proposed under Cu(I) free “click” chemistry. Chitosan is modified with propargyl bromide to obtain chitosan derivative whereas magnetite nanoparticles are coupled with silane followed ...
Modification of layered silicates and layered double hydroxides for preparation of polyolefin nanocomposites

Nattaya Muksing (Chulalongkorn University, 2011)

In this desertion, two types of layered inorganic clays: layered silicate and layered double hydroxide (LDH) were chosen as nanofillers for the preparation of polyolefins nanocomposites. Both types of nanocomposites were ...

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