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Petro - Theses: Recent submissions

Now showing items 841-860 of 1415

The Study of polybenzoxazine as an adhesive for aluminum

Sawitree Buranapaiboon (Chulalongkorn University, 1996)

Polybenzoxazine, a new class of phenolic thermosetting resins, has been studied for aluminum adhesive. In this work, the mechanical property of polybenzoxazine based on aniline and on methylamine was determined by lap shear ...
Aggregation and growth of model silica particles

Acharee Siriwongse (Chulalongkorn University, 1996)

In this thesis study, the stability and the flocculation behavior of silica colloidal particles in aqueous system in the presence of a polymer and a surfactant were investigated. The size of particles and floes were measured ...
A stability diagram for the onset of HDPE, MDPE and LLDPE sharkskin extrudates

Jeerawan Banyam (Chulalongkorn University, 1998)

Sharkskin defect and flow instability of FIDPE, MDPE, and LLDPE polymer melts were studies by capillary and parallel plates rheometers. The onset conditions of HDPE. MDPE, and LLDPE sharkskin were investigated in terms of ...
Investigation of the dependence of hexane-soluble fraction of polyethylene formed during slurry polymerization of ethylene with ziegler-natta catalyst

Chongkiat Visetjung (1998)

The polymerization conditions affecting the amount of hexane-soluble fraction of polyethylene or low molecular weight polyethylene (LMWPE) which is the by-product of slurry polymerization process of ethylene with Ziegler-Natta ...
Tribological properties PEMA-PMMA copolymer thin films

Yindee Tongkhundam (Chulalongkorn University, 2003)

The science and engineering of friction and wear involving polymer surfaces are not well understood. From various types of polymeric materials available, we investigated tribological properties of films made from copolymers ...
Modeling of capillary rise in an annular geometry

Wuttinan Panmaluak (Chulalongkorn University, 2003)

The presence of water in the small gaps of aluminum rivets and screw fasteners appears to cause million-dollar problems. This problem has been observed, for example, on the fuselage of some aircraft, with significant ...
Effect of cosurfactant on extraction and activity of alpha-chymotrypsin in NaDEHP microemulsion

Viput Phanawadee (Chulalongkorn University, 2003)

Liquid-liquid extraction using microemulsion has gined increasing interest from various industries for its potential applications in the separation and purification of biomolecules such as proteins and antibiotics. In this ...
Studies of parameters affecting sol-gel process of sodium tris(glycozirconate) toward the preparation of ZrO2

Tivaporn Apphakvan (Chulalongkorn University, 2003)

Zirconium dioxide, or Zirconia, (ZrO2) was prepared by sol-gel method using sodium tris(glycozirconate) as precursor. An enormous advantage of this precursor is its reduction in reactivity with water. It can be synthesiaed ...
Comparison of single-wall carbon nanotubes prepared by catalytic decomposition of methane and disproportionation of carbon monoxide over different catalysts

Teerakun Boonphyoong (Chulalongkorn University, 2003)

Single-wall carbon nanotubes (SWNT) exhibit outstanding mechanical and electrical properties, which can be utilized for various potential applications. Currently, the catalytic decomposition of carbon-containing gases is ...
Experimental study and simulation of bubble fluidization

Suttipong Songprawat (Chulalongkorn University, 2003)

The objectives of this study were to measure the particl granular temperature in gas-solid fluidization using a CCD camera technique, to simulate the model for bubble fluidization, and to compare the experimental results ...
Development of polyaniline/polyimide composite as a heat resistant gas sensor

Sutthida Watcharaphalakorn (Chulalongkorn University, 2002)

Polyaniline (PANI)-based gas sensor was modified to be used at high temperature by dispersing PANI in an insulating polyimide (PI) matrix using a dry mixing method. The effect of acid dopant type, acid concentration and ...
Chitosan-PEG : an approach for a self supramolecular derivative

Sasiprapha Phongying (Chulalongkorn University, 2003)

A self supramolecular structured chitosan is designed and prepared by introducting polyethyleneglycol monomethylether onto low molecular weight chitosan chain. The packing structure of the product observed from wide angle ...
The Use of sericin as an antioxidant and antimicrobial for polluted air treatment

Sara Sarovart (Chulalongkorn University, 2003)

The aim of study was to enhance the properties of air filters by coating the filter with silk sericin, which is mostly discraded in wastewater during silk processing. The antioxidant activities against hydroxyl radical ...
Atomic force microscope studies of the ultrathin polystyrene/silica composite film formation on mica

Rampaiphan Saechia (Chulalongkorn University, 2003)

The elucidation of organic-inorganic hybrid materials at nanolevel is now widely investigation. One of the most promising ways of making such materials utilizes the surfactant template technique. This research focused on ...
Finite element method for chemical engineering applications

Puchong Thipkhunthod (Chulalongkorn University, 2002)

The finite element method, or FEM, is one of numerical methods, which is used to solve manyengineering problems efficiently. It provides better alternative thai is suitable for systems with irregular geometry, unusual ...
Surfactant diffusivity measurement by transient capillary rise

Pree Enkvetchakul (Chulalongkorn University, 2003)

Surfactant diffusivity measurements are of great interest, in part, due to its importance in many aspects like cleaning processes and textile industries (Rosen 1989). Presently, the most commonly used technique to determine ...
Pyrolysis of oil sludge from an API separator

Prame Punnaruttanakun (Chulalongkorn University, 2003)

Typically, API separator sludge can be handled via combustion and/or recycling into reusable oils. However, it has been found that such methods cause secondary pollutants. Recently, pyrolysis has been proven to be an ...
Effect of silanized silica, calciumhydroxyapatite and modified clay on strength and hardness of dental composites/nanocomposites

Piyanart Ekworapoj (Chulalongkorn University, 2002)

The ultimate aim of this work was to enhance the mechanical strength of dental resin by monomer intercalation into clay galleries to obtain dental nanocomposites. However, to obtain suitable hardness and compatibility to ...
Regeneration of t-octylphenolpolyethoxylate (triton x-114) coacervate phase by vacuum stripping

Pisit Tanawuttiwat (Chulalongkorn University, 2003)

In order to make the cloud point extraction (CPE) process economically feasible it is necessary to recover and reuse the surfactant from the effluent stream, which is the coacervate phase solution. This study utilized a ...
Photocatalytic degradation of 4-chlorophenol by Au/sol-gel TiO2, Au-Ag/sol-gel TiO2 and immobilized TiO2

Piriyaporn Wongwisate (Chulalongkorn University, 2003)

Photocalytic degradation of 4-Chlorophenol (4-CP) was studied using TiO2, Au/TiO2, Ag/TiO2 and Au-Ag/TiO2 prepared by the sol-gel methods and commercial TiO2 (Degussa P25) as photocatalysts. An amount of intermediate ...

Now showing items 841-860 of 1415

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