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Factors Relating To Methamphetamine Relapse Risk Among Clients In The Substance Rehabilitation Center Of National Narcotics Boards In West Java, Indonesia, Gian Nurmaindah Hendianti
Factors Relating To Methamphetamine Relapse Risk Among Clients In The Substance Rehabilitation Center Of National Narcotics Boards In West Java, Indonesia, Gian Nurmaindah Hendianti
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purposes of this descriptive correlational research were to describe methamphetamine relapse risk and examine the relationship between self-efficacy, outcome expectancy, motivation, coping, emotional state, craving, social support, and methamphetamine relapse risk among methamphetamine users. The purposive sample of 165 who met the inclusion criteria were recruited from clients admitted to a primary phase treatment in the Substance Rehabilitation Center of National Narcotics Board in West Java, Indonesia. The research instruments were: 1) the demographic characteristic questionnaire, 2) Drug Taking Confidence Questionnaire, 3) Stimulant Effect Expectancy Questionnaire, 4) Stage of Change Readiness and Treatment Eagerness Scale version 8.0 for Drug, …
Predicting Factors Of Recovery Among Persons With Major Depressive Disorder, Nusra Vorapatratorn
Predicting Factors Of Recovery Among Persons With Major Depressive Disorder, Nusra Vorapatratorn
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purposes of this descriptive research was to examine the causal relationship between strength self-efficacy, resourcefulness, purpose in life, social support, alcohol abuse, and recovery among persons with major depressive disorder (MDD). The conceptual framework was guided by Schlotfeldt's Health Seeking Model. 444 participants with MDD. who attended outpatient department, mental health and psychiatric clinics, and mental health and psychiatric division in eight hospitals from all part of Thailand participated in this study. The participants were obtained by simple random sampling. The research instruments included a personal data sheet, the Strength Self-Efficacy Scale, the Resourcefulness Scale, the Purpose in Life …
Self-Care Of Older Persons Living With Diabetes In Vietnam: A Qualitative Study, Quyen Truong Thi Mai
Self-Care Of Older Persons Living With Diabetes In Vietnam: A Qualitative Study, Quyen Truong Thi Mai
Chulalongkorn University Theses and Dissertations (Chula ETD)
This study aimed to describe the meaning of "self-care" from the perspectives of older persons living with diabetes and explored the self-care behaviors of older persons living with diabetes. The qualitative method was applied in this study. Data were collected by in-depth interview of 16 older persons with Type 2 diabetes in Vietnam. In addition, field note and observation note were written on the reflections, ideas, and meaning of self-care and self-care practices during the data collection process. All data were analyzed by using content analysis method. The results of the study were reflected the self-care from the perspective of …
Prevalence Of Chronic Temporomandibular Disorder Pain And Comorbidities In A Group Of Thai Patient: A Cross Sectional Study, Tra Thu Nguyen
Prevalence Of Chronic Temporomandibular Disorder Pain And Comorbidities In A Group Of Thai Patient: A Cross Sectional Study, Tra Thu Nguyen
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objectives: 1. to investigate the prevalence of chronic temporomandibular disorder (TMD) and its comorbidities in a group of Thai patients; 2. to evaluate the relationship between pain parameters (pain duration, pain intensity, and pain frequency) with the number of comorbidities and widespread pain index (WPI); 3. to assess the relationship between the presence of chronic pain with familial history in TMD pain patients. Methods: A cross-sectional study was undertaken of 351 outpatients. Patients were given an interviewer-administered questionnaire which contained four parts (demographic data, pain parameters, WPI and comorbidities diagnosis). Diagnosis was made in accordance with Diagnostic Criteria for Temporomandibular …
The Effect Of Uncertainty Management Program On Quality Of Life Among Vietnamese Women With Post Mastectomy, Xuan Ha Thi Nhu
The Effect Of Uncertainty Management Program On Quality Of Life Among Vietnamese Women With Post Mastectomy, Xuan Ha Thi Nhu
Chulalongkorn University Theses and Dissertations (Chula ETD)
The aim of this study was to test the effect of the Uncertainty Management Program (UMP) on quality of life among Vietnamese women at 3-weeks post mastectomy. The quasi-experimental design with posttest only was conducted in 115 women with post mastectomy who were assigned in experimental group (n=57) and control group (n=58). The experimental group received the UMP and routine care while the control group received only routine care. Participants were assessed at 3-weeks post mastectomy using the modified Quality of Life Index Scale Vietnamese version with Cronbach's alpha coefficient of .81. It was found that at 3-weeks post-mastectomy, the …
Patient's Perception And Satisfaction On Dental Implant Therapy By Postgraduate Dental Students And Experienced Dentists, Pat Vipattanaporn
Patient's Perception And Satisfaction On Dental Implant Therapy By Postgraduate Dental Students And Experienced Dentists, Pat Vipattanaporn
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objective: To evaluate and compare patient's perception and satisfaction between patients who received dental treatment from postgraduate dental students and experienced dentists. Material and methods: This descriptive cross-sectional study was performed in patients who received the dental implant from Faculty of dentistry Chulalongkorn University. A data collection of patient's perception and satisfaction was done by questionnaire which was sent by mail. The questionnaire contained 23 statements including 7 statements of demographic data, 7 statements of perception, and 9 statements of satisfaction. The patient had to answer through the one-best-answer multiple choices and visual analog scale (VAS). Results: The 382 participants …
Comparison Of The Accuracy Of Surgical Guided Template Produced From Intraoral Scan Technique And Model Scan Technique For Implantation Using Computer Assisted Implant Surgery, Prudsaporn Kiatkroekkrai
Comparison Of The Accuracy Of Surgical Guided Template Produced From Intraoral Scan Technique And Model Scan Technique For Implantation Using Computer Assisted Implant Surgery, Prudsaporn Kiatkroekkrai
Chulalongkorn University Theses and Dissertations (Chula ETD)
Objectives: To compare the accuracy of implant position placed by CAIS technique using surgical guided template produced by intraoral scan and model scan. Materials and methods: Patients who needed single tooth implant restoration were enrolled in this study and devided into two groups randomly according to the surface scan technique (n=30 each group). Intraoral scans were done using the Trios Scanner (3shape). While, diagnostic casts were scanned by D900L lab scanner (3shape). The templates were design by the clinician using coDiagnostiX software (Dental Wings Inc.). Implant surgery were performed according to fully CAIS protocol. CoDiagnostiX software was used to compare …
Comparative Study Of In Vivo Bone Regeneration Using Chitosan/Dicarboxylic Acid Scaffold Implanted With Human Periodontal Ligament Cells, Teerawat Sukpaita
Comparative Study Of In Vivo Bone Regeneration Using Chitosan/Dicarboxylic Acid Scaffold Implanted With Human Periodontal Ligament Cells, Teerawat Sukpaita
Chulalongkorn University Theses and Dissertations (Chula ETD)
After tooth loss, a consequent atrophy of the alveolar process always takes place and adversely affect the reconstruction process especially by dental implant. A novel chitosan/dicarboxylic acid scaffold (CS/DA scaffold) has been developed and proven to be an excellent candidate material in bone tissue engineering. This study aimed to evaluate the effects of a CS/DA scaffold with and without seeded primary human periodontal ligament cells (hPDLCs) in mouse calvarial defect model. Eighteen mice were divided into 3 groups of 6 each. Four-millimeter calvarial defects were created on both side of parietal bone and implanted with either CS/DA scaffold or CS/DA …
The Application Of Prostacyclin In Promoting Angiogenesis Of Dental Pulp Tissue In A Three Dimensional Organ Culture System, Sonntana Seang
The Application Of Prostacyclin In Promoting Angiogenesis Of Dental Pulp Tissue In A Three Dimensional Organ Culture System, Sonntana Seang
Chulalongkorn University Theses and Dissertations (Chula ETD)
Background: Dental pulp vitality can be threatened by carious or iatrogenic exposure that can lead to pulp tissue loss. The formation of a vascular network is crucial to provide a suitable environment for tissue regeneration. Thus, promoting angiogenesis is essential for successful pulpal repair in regenerative endodontics therapy. Iloprost, a prostacyclin analog, promotes vascularization in several organs such as, heart, lung, and corneal. Previously, it has been demonstrated that, iloprost induced pulpal blood flow and enhanced dentin formation in a rat mechanical pulp exposure model. However, the angiogenic effect of iloprost on the human dental pulp vasculature remains unknown. Objective: …
Metal-Salen Derivatives For Electro-Reduction Of Carbon Dioxide, Kantima Chitchak
Metal-Salen Derivatives For Electro-Reduction Of Carbon Dioxide, Kantima Chitchak
Chulalongkorn University Theses and Dissertations (Chula ETD)
Copper(II) salen, salophen-based ligands, and their corresponding copper complexes were prepared and utilized for the electrocatalytic reduction of carbon dioxide. Controlled-potential electrolysis of copper(II) salen electrocatalyst with carbon dioxide in non-aqueous solution was investigated to obtain the optimized electrolysis condition including the applied potential and proton donor quantity. With the applied potential of –2.10 V, carbon monoxide (3.50-16.30%) was obtained as the only product in gas phase. Methane was additionally found with the addition of proton donor and its maximum percentage (0.39 ± 0.00%) were obtained from the electrolysis with 25.00 mM proton donor and 2.00 mM copper(II) salen. Moreover, …
Synthesis Of Ni-Tin Incorporated Porous Silica Catalysts For Dry Reforming Of Methane, Maslin Chotirach
Synthesis Of Ni-Tin Incorporated Porous Silica Catalysts For Dry Reforming Of Methane, Maslin Chotirach
Chulalongkorn University Theses and Dissertations (Chula ETD)
A new titanium nitride (TiN) promoted nickel catalyst was synthesized and tested as an alternative catalyst in the dry reforming of methane (DRM). The series of this catalyst with various Ni and TiN contents was prepared in two steps, direct synthesis of SBA-15 in the presence of TiN, followed by the impregnation of Ni. The influence of TiN promoted Ni-based catalyst on dry reforming reaction was investigated at the temperature of 700ºC and atmospheric pressure for a duration of 4 h, using feed ratio of CH4/CO2 = 1. The promising catalysts, that gave highest CO2 and CH4 conversions as well …
Electrochemical Properties Of Lnsr3-Xcaxfe3-Ybyo10 (Ln = La, Pr And Sm; X = 0-1.0; B = Co, Ni And Cu; Y = 0-1.5) For Intermediate Temperature Solid Oxide Fuel Cells, Nicharee Wongsawatgul
Electrochemical Properties Of Lnsr3-Xcaxfe3-Ybyo10 (Ln = La, Pr And Sm; X = 0-1.0; B = Co, Ni And Cu; Y = 0-1.5) For Intermediate Temperature Solid Oxide Fuel Cells, Nicharee Wongsawatgul
Chulalongkorn University Theses and Dissertations (Chula ETD)
To enhance the electrochemical performance of cathode material for intermediate temperature solid oxide fuel cell (IT-SOFC) the Ruddlesden-Popper (RP) phases of LnSr3-xCaxFe3-yByO10 (Ln = La, Pr and Sm; x = 0-1.0; B = Ni, Co, and Cu; y = 0-1.5) was investigated and prepared by citric nitrate combustion method. Firstly, various Ca concentrations were added to the LaSr3-xCaxFe3O10-δ structure and it was found that the materials contained low Ca concentration provided the lower area specific resistance (ASR) and better electrochemical cell performance due to the enhance in conductivity and reduction of TEC. Secondly, the effect of Pr and Sm replacement …
Electrochemical Sensors For Human Papillomavirus Dna, C-Reactive Protein And Food Colorants Detections, Sakda Jampasa
Electrochemical Sensors For Human Papillomavirus Dna, C-Reactive Protein And Food Colorants Detections, Sakda Jampasa
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this dissertation, electrochemical sensors for determination of medical biomolecular markers and food colorants were developed. The research can be divided into two parts. In the first part, electrochemical sensors for determination of clinically important biomarkers were studied. There was two subprojects based on the target markers. The first subproject was the development of electrochemical sensor for the simultaneous detection of high-risk human papillomaviruses (HPV) DNA type 16 and 18 as biomarkers for cervical cancer. In this work, a highly specific pyrrolidinyl peptide nucleic acid was employed as DNA capture probe for both target DNAs. A second PNA probe labeled …
Fecu/Sio2 Catalysts Prepared By Autocombustion Method For Fischer-Tropsch Synthesis, Suthasinee Pengnarapat
Fecu/Sio2 Catalysts Prepared By Autocombustion Method For Fischer-Tropsch Synthesis, Suthasinee Pengnarapat
Chulalongkorn University Theses and Dissertations (Chula ETD)
The purpose of this study was to prepare iron-based catalysts supported on silica by autocombustion method for directly using for Fischer-Tropsch synthesis (FTS) without a reduction step. The effect of different citric acid (CA):iron nitrate (N) molar ratios (CA:N), acid types and SiO2 supports on the FTS performance of catalysts were investigated. The CA:N had an important influence on the formation of iron active phases (FexC) and FTS activity. Increasing the CA:N molar ratios up to 0.1 increased CO conversion of catalyst to 86.5%, which was then decreased markedly at higher CA:N molar ratios. An excess of CA resulted in …
Microencapsulation Of Eugenol In Polyelectrolyte Complexes Of Chitosan And Alginate, Chamaiporn Supachettapun
Microencapsulation Of Eugenol In Polyelectrolyte Complexes Of Chitosan And Alginate, Chamaiporn Supachettapun
Chulalongkorn University Theses and Dissertations (Chula ETD)
Eugenol is widely used in several applications such as food activity packaging to prolong shelf life of fruits and vegetables because of its antimicrobial activity. However, eugenol is easy to decompose, leading to reduce its activity. In this work, we prepared eugenol loaded alginate-chitosan microparticles in order to solve this problem and controlled release essential oil using ionic gelation technique. The effect of concentration of eugenol (0.1-0.5 g), calcium chloride (0.5 – 8 %W/V) and surfactant (2-10% W/V) was investigated. The results showed that the optimum condition was eugenol 0.1 g, calcium chloride 2% W/V and surfactant 4% W/V. The …
Functional Surfactants In Lubricant For Microelectronic Industry, Chuenkamol Khongphow
Functional Surfactants In Lubricant For Microelectronic Industry, Chuenkamol Khongphow
Chulalongkorn University Theses and Dissertations (Chula ETD)
The functional surfactants, as the additional additives in the standard glycol-based lubricant were studied and optimized to reduce and protect the surface of the magnetic read/write head from deposited contaminants during the lapping processes. The scanning electron microscopy (SEM) and energy-dispersive x-ray spectroscopy (EDS) results identified that the black contamination was bismuth (Bi) particles, came out from lapping plate during the lapping process due to wear. Selected surfactants exhibited the results in reduce and prevent the deposition of contaminants by forming the micelle beyond their critical micelle concentration (CMC) values. We found that both polyethoxylate alcohol (PEAL) and quaternary amines …
Mixed Metal Oxide Catalysts Derived From Natural Sources For Production Of Fatty Acid Methyl Esters, Wayu Jindapon
Mixed Metal Oxide Catalysts Derived From Natural Sources For Production Of Fatty Acid Methyl Esters, Wayu Jindapon
Chulalongkorn University Theses and Dissertations (Chula ETD)
The objectives of this research are to study active sites of Ca-based catalysts derived from calcite (CaCO3) and dolomite (CaMg(CO3)2), and to clarify catalytic effect of MgO in the calcined dolomite as catalyst in transesterification of palm oil with methanol. Firstly, the effects of calcination temperature on evolution of MgO in dolomite and its catalytic activity were studied. The MgO containing in the calcined dolomite was not active, while the main active site was CaO. However, Ca and Mg mixed oxides obtained from calcined dolomite had higher activity than that prepared by physical mixing in which calcite and magnesite (MgCO3) …
Synthesis Of Puerarin-Gold Nanoparticles For Transdermal Delivery, Kwanruen Chanpeng
Synthesis Of Puerarin-Gold Nanoparticles For Transdermal Delivery, Kwanruen Chanpeng
Chulalongkorn University Theses and Dissertations (Chula ETD)
Puerarin (Pur) is herbal medicine that its inflammatory response but low solubility to reduce activity. Thus, the aim of this study was to synthesize q188-kappa-carrageenan@Pur@gold nanoparticles (q188-κ-c@Pur@AuNPs) for enhancing solubility and transdermal delivery. The κ-c was synthesized by quaternization of κ-c with 25% (v/v) q188, and the q188-κ-c @AuNPs was prepared by reducing HAuCl4 into AuNPs by using 25% (v/v) q188-κ-c as reducing and stabilizing agents. The highest degree of quaternization (%DQ) at 21.12% was found q188 addition, which was calculated from 1H NMR. The solubility of the q188-κ-c derivatives was 43.7±0.01%, which higher than κ-c. The size of synthesized …
Effect Of Corrosion Inhibitors In Lubricant For Electronic Industry, Natclitta Maipul
Effect Of Corrosion Inhibitors In Lubricant For Electronic Industry, Natclitta Maipul
Chulalongkorn University Theses and Dissertations (Chula ETD)
The selected functional polymers and fatty esters of poly)1-butene pyrrolidone) (PP) and propylene glycol monostearate (PG) were investigated and applied to use as the corrosion inhibitors for protecting material removal during read/write head lapping processes in hard disk drive (HDD) production. Potentiodynamic polarization measurement was used to study their corrosion behaviors against antiferromagnetic materials (IrMn) which are the most sensitive materials in the head structure. Corrosion rate of PP- and PG-modified lubricants were 0.086 and 0.084 Å/min, respectively, while standard lubricant was 0.111 Å/min. Moreover, the leaching out of metallic atoms was investigated by using inductively couple plasma mass spectroscopy …
Hydrodeoxygenation Of Oleic Acid On Unsupported Co-Mo And Ni-Mo Sulfide Catalysts, Paphawee Sanggam
Hydrodeoxygenation Of Oleic Acid On Unsupported Co-Mo And Ni-Mo Sulfide Catalysts, Paphawee Sanggam
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this research, hydrodeoxygenation (HDO) of oleic acid (model compound of palm oil) over unsupported Co-Mo and Ni-Mo sulfide catalysts was carried out in Parr reactor to produce bio-hydrogenated diesel (BHD). The effects of reaction parameters: temperature, hydrogen pressure and the mole ratio of catalysts (Ni/(Ni+Mo) or Co/(Co+Mo)) on the conversion and product yields (mainly n-C17 and n-C18 hydrocarbons) were investigated to find the optimal conditions. The results showed that high pressure favored a HDO pathway, while high temperature strongly affected to decarboxylation and decarbonylation pathways. At optimal condition as temperature of 280oC, reaction times of 6 h and hydrogen …
Photooxidation Of Organosulfur Compounds Catalyzed By Iodo-Bodipy Derivatives Under Visible Light Irradiation, Piyamaporn Tangkasemsamran
Photooxidation Of Organosulfur Compounds Catalyzed By Iodo-Bodipy Derivatives Under Visible Light Irradiation, Piyamaporn Tangkasemsamran
Chulalongkorn University Theses and Dissertations (Chula ETD)
In this work, iodo-BODIPY derivatives, I-GB, 3I-GB, I-RB, were synthesized and used as photocatalysts for oxidation of organosulfurs such as thiols and thioethers into the corresponding disulfides and sulfoxides, respectively, as well as compared with benchmark photocatalyst, rose bengal. All BODIPY derivatives were successfully synthesized in good yields (36-80%) via condensation reaction between 4-iodobenzaldehyde and corresponding pyrroles, followed by oxidation with DDQ and complexation with BF3.OEt2. Among all synthesized BODIPYs, 3I-GB and 3I-RB showed relatively low quantum yield (0.053-0.054) with high singlet oxygen generation efficiency under green LED suggesting that both of them could serve as good photocatalysts for sulfur …
Preparation Of Porous Carbon From Popped Rice Via Impregnated Water Coupled With Freeze-Drying Process, Purichaya Nisawa-Anutaraphan
Preparation Of Porous Carbon From Popped Rice Via Impregnated Water Coupled With Freeze-Drying Process, Purichaya Nisawa-Anutaraphan
Chulalongkorn University Theses and Dissertations (Chula ETD)
Activated carbon is an interesting material due to its high surface area derived from the highly porous structure. This material is suitable for using as a good adsorbent in various applications such as wastewater treatment, gas absorption and medicine. Production of activated carbon typically consists of two steps which are carbonization and activation. Agricultural wastes are used as carbon sources. This research focuses on the production of activated carbon from popped rice due to its appropriate chemical and structural characteristics, including highly starch content and connected-pore structure. Therefore, it should potentially be applied to produce activated carbon if the surface …
Development Of Hydrogen Embrittlement Resisted Pd-Cu Alloy Membrane, Ratchaneekorn Chukiatthai
Development Of Hydrogen Embrittlement Resisted Pd-Cu Alloy Membrane, Ratchaneekorn Chukiatthai
Chulalongkorn University Theses and Dissertations (Chula ETD)
The development of PdCu alloy membranes that can be used in hydrogen separation at low working temperature (<300°C) without hydrogen embrittlement problem is a very attractive topic for the petrochemical industry. Pd–Cu membranes have been prepared by electroless plating and electroplating method on stainless steel support. The compositions of the PdCu alloy membranes were related to both the metal deposition rates. The appropriate annealing temperature of Pd–Cu membranes was found at 500 °C in argon atmosphere for 24 hours to form a complete alloy material. After thermal annealing, the Cu atom was distributed in Pd alloy membrane. The surface morphology, compositions, and crystallinity of the PdCu alloy membranes were characterized using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS) and X-ray diffraction (XRD). The best Pd contents in PdCu alloy membrane were about 84 and 75 %at. The hydrogen flux through the PdCu alloy membrane was measured at temperature 150 to 300 °C and differential pressure 0.5 to 2.5 bar for membrane stability. The hydrogen flux increased with increasing temperature and pressure. Adding Cu atoms in Pd can reduce strain in Pd lattice structure. Both PdCu alloy membrane can be operated at the lower temperature than a critical temperature of pure Pd membrane without hydrogen embrittlement.
Effect Of Metallocene Elastomers And Screw Speed On Polypropylene Compounds: Morphological And Physical Properties, Supot Ponhan
Effect Of Metallocene Elastomers And Screw Speed On Polypropylene Compounds: Morphological And Physical Properties, Supot Ponhan
Chulalongkorn University Theses and Dissertations (Chula ETD)
Polypropylene (PP) which is widely used in automotive industries can replace engineering plastics and metals due to its outstanding mechanical properties, moldability and reduced weight. Some automotive parts such as bumper require higher impact resistance, which is the limited property of PP. The aim of this work is to improve the impact properties with balancing the stiffness-impact properties and the physical properties by blending PP with metallocence elastomer (POE) using a twin screw extruder. The effects of PP and POE type and blending ratio on the PP/POE blends properties and morphology was studied. The results showed that the impact strength …
Water/Dust Repellent Coatings For Wood Surface From 3-Aminopropyltriethoxy Silane-Quat 188, Tanate Tubtimtong
Water/Dust Repellent Coatings For Wood Surface From 3-Aminopropyltriethoxy Silane-Quat 188, Tanate Tubtimtong
Chulalongkorn University Theses and Dissertations (Chula ETD)
Wetting and dust fouling on wood surface are big problems because of hydroxyl group and static charge on its surface. These problems could be minimized by surface modification which decreasing of hydroxyl groups and increasing of positive charges on wood surface. Many researches were reported about wetting issue but there were few studies directly involved to dust problem. In this research, 3-aminopropyltriethoxy silane (APTES) and 3-chloro-2-hydroxypropyltrimethyl ammonium chloride (Q188) were used to modify hydroxyl groups on wood surface to enhance wetting and dust repellency behavior of wood. The APTES-treated woods (AW) were prepared by immersion solution method and then were …
Molecular Dynamics Of Single-Wall Carbon Nanotube Wrapped With Polypropylene, Wanwisa Panman
Molecular Dynamics Of Single-Wall Carbon Nanotube Wrapped With Polypropylene, Wanwisa Panman
Chulalongkorn University Theses and Dissertations (Chula ETD)
Nowadays, the nanocomposite materials have been widely used in various applications due to their unique properties such as thermal and electrical properties. Polymer/carbon nanotube (CNT) nanocomposite is one the important nanocomposite materials that are manufactured for improving thermal conductivity and electrical properties of polymers. Unfortunately, polypropylene (PP)/CNT preparation is difficult because of CNT dispersion and aggregation. Accordingly, amylose (AMY) and chitosan (CS) are selected in the present study in order to demonstrate how AMY and CS could diminish such problems by non-covalent modification on outer surface of single-walled CNT using molecular dynamics (MD) simulations. The MD results reveal that AMY …
Methane Adsorption By Carbon Molecular Sieve Derived From Polycarbonate And Polyaniline, Jakchai Thawornwatthanasirikul
Methane Adsorption By Carbon Molecular Sieve Derived From Polycarbonate And Polyaniline, Jakchai Thawornwatthanasirikul
Chulalongkorn University Theses and Dissertations (Chula ETD)
The adsorptions of methane by carbon molecular sieves (CMS) were investigated at 35°C and 45°C by volumetric apparatus with the pressure range from 0 to 800 psia. CMS was prepared from polymer precursors such as polycarbonate (PC) and polyaniline (PANI) by carbonization under nitrogen inert atmosphere and activation by CO2 at temperature 700, 800 and 900°C. The yield of CMS is decreased with increasing carbonization and activation temperature. The methane adsorption capacity at 35°C of CMS derived from PC is 2.82 mmol CH4/g. The methane adsorption of the samples from PC is higher than those obtained from PANI for the …
Effect Of Oxygen-Containing Functional Groups On Methane Adsorption By Activated Carbon, Kittima Dheerapreampree
Effect Of Oxygen-Containing Functional Groups On Methane Adsorption By Activated Carbon, Kittima Dheerapreampree
Chulalongkorn University Theses and Dissertations (Chula ETD)
Natural gas has been applied as a fuel for vehicle because it is cheaper and cleaner burning than other fuels. In the vehicle, natural gas is ordinarily reserved by compressing and storing under high pressure at room temperature but this method has several limitations (e.g. low energy density, high weight of tank). Therefore, a porous material with high specific surface area (e.g. activated carbon) is suggested to eliminate the limitations of natural gas storage by compression, natural gas is adsorbed at relatively low pressure and room temperature. The adsorption capacity of activated carbons is related with their physical and chemical …
Clinical Efficacy Of Biocellulose Wound Dressing Containing Silk Sericin And Polyhexamethylene Biguanide For Split-Thickness Skin Graft Donor Sites, Supamas Napavichayanun
Clinical Efficacy Of Biocellulose Wound Dressing Containing Silk Sericin And Polyhexamethylene Biguanide For Split-Thickness Skin Graft Donor Sites, Supamas Napavichayanun
Chulalongkorn University Theses and Dissertations (Chula ETD)
A biocellulose wound dressing composed of silk sericin as an accelerative wound healing component and polyhexamethylene biguanide (PHMB) as an antimicrobial agent which showed effective and safe wound treatment. A prospective, single-blinded, randomized controlled matched-pair study was designed to evaluate the safety and the clinical efficacy of the biocellulose wound dressing containing silk sericin and PHMB compared with Bactigras® in healthy volunteers (phase I clinical study) and in split-thickness skin graft (STSG) donor site wound treatment (phase II clinical study). There were 105 healthy volunteers in phase I clinical study. The results showed that the erythema and melanin levels of …
Anti-Aging Activity Evaluation Of Grammatophyllum Speciosum Extract For Development Into An Anti-Wrinkle Serum, Verisa Chowjarean
Anti-Aging Activity Evaluation Of Grammatophyllum Speciosum Extract For Development Into An Anti-Wrinkle Serum, Verisa Chowjarean
Chulalongkorn University Theses and Dissertations (Chula ETD)
Grammatophyllum speciosum Blume (Orchidaceae) is a large-sized orchid in Southeast Asia. The aim of this study was to evaluate G. speciosum pseudobulb extract for anti-aging activities, both in vitro and in vivo. In vitro anti-aging activity was performed using non-cell and cell-based assays. In vitro study, G. speciosum pseudobulb extract exhibited a high content of gastrodin, which was used as an active analytical marker. The total content of the antioxidant polyphenols in G. speciosum ethanolic extract was 48.19 ± 0.39 mg epigallocatechin gallate (EGCG) equivalent / g extract. The anti-collagenase enzyme activity of the ethanolic extract of the pseudobulb of …