Utilization of Polyurethane and Sodium Polyacrylate for the Synthesis of Carbon Dots and their Sensing and Energy Storage Applications

Peerasak Paoprasert,Wasinee Pholauyphon,Kulpriya Phetcharee,Natee Sirisit,Jedsada Manyam,Insik In 한국고분자학회 2022 한국고분자학회 학술대회 연구논문 초록집 Vol.47 No.1

Analyzing local perceptions toward the new nuclear research reactor in Thailand

Tantitaechochart, Sarasinee,Paoprasert, Naraphorn,Silva, Kampanart Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.12

Understanding public perception on nuclear research reactor is necessary for the policy maker to adopt such technology in Thailand, especially the locals who live in the proposed location. The study compared perceptions between the locals living near the proposed nuclear research reactor location (within 5 km) and those living in the outer region (5-15 km). Structural equation modeling technique was adopted by assuming casual relationships between latent variables including social status, information perception, trust, benefit perception and risk perception on the local acceptance of research reactor. The results showed that the strongest relationships for both the inner and the outer perimeters were from information perception toward technology acceptance via trust and benefit perception. While both zones showed similar results, the outer perimeter seemed to show slightly stronger effects than those in the inner perimeter.

Factors Affecting Crop Choices in Thailand: Rice or Sugarcane?

Sasarose Jaijit,Naraphorn Paoprasert,Papis Wongchaisuwat,Piya Kittipadakul 대한산업공학회 2023 Industrial Engineeering & Management Systems Vol.22 No.3

This work identifies the key factors affecting the substitution of rice with sugarcane production in Thailand. We col-lected primary data from 223 farmers in a targeted area of Chachoengsao, Lopburi, and Saraburi Provinces. To de-termine the most important factors using stepwise and PCA in logistic regression approaches, aspects such as physical and crop characteristics, socioeconomic indicators, and personal perspectives were examined. Our stepwise selection procedure with a 95% confidence interval revealed that 9 out of the 38 features were retained for Area 1 and a total of 12 features were retained for Area 2. From using PCA in logistic regression, the knowledge of sugarcane farming and the cost of sugarcane farming were the top features of encourage and inhibit factors in the choice to switch crops in Area 1. Conversely, rice farmers in Area 2 base their decisions predominantly on their knowledge of sugarcane farming while the adaption of sugarcane production technology contributed to the farmers' concerns about the switching. Finally, to capture farmers’ financial considerations, the cost structure and net present value of profits cor-responding to sugarcane farming yield 5–6 times more net profit in NPV than rice farming.

Preparation and Temperature-Responsive Behavior of Crosslinked Polymers Between Poly(N-Isopropylacrylamide) and Natural Rubber

Pattaraporn Nuntahirun,Oraphin Yamamoto,Peerasak Paoprasert 한국고분자학회 2016 Macromolecular Research Vol.24 No.9

Stimuli-responsive polymers are considered as smart materials as they can respond to subtle changes in external stimuli, such as pH, temperature, light, magnetic field, etc. Natural rubber (NR) is one of the most important renewable resources, offering excellent flexibility and fatigue resistance. In this work, temperature responsiveness was introduced to NR via a crosslinking reaction with poly(N-isopropylacrylamide) (PNIPAM) using benzoyl peroxide as a free radical crosslinker. PNIPAM was chosen because it is a well-known temperature-responsive polymer with a lower critical solution temperature near the human body temperature, enabling applications in biomedical fields. The crosslinked materials between PNIPAM and NR were characterized using Fourier transform infrared spectroscopy, differential scanning calorimetry, thermogravimetric analysis, and X-ray photoelectron spectroscopy. The effects of polymer and crosslinker concentration, reaction temperature, and reaction time on the gel content were studied. The temperature responsiveness of the crosslinked polymers was investigated and the lower critical solution temperature was found to be in the range 30-34 oC. Based on these results, we demonstrated a straightforward strategy for preparing crosslinked polymers between PNIPAM and NR. The introduction of temperature responsiveness into NR will lead to new responsive rubber-based materials and expand the range of potential applications.

Environmentally Friendly Supercapacitor Based on Carbon Dots from Durian Peel as an Electrode

Praneerad, Janjira,Neungnoraj, Khanin,In, Insik,Paoprasert, Peerasak Trans Tech Publications, Ltd. 2019 Key Engineering Materials Vol.803 No.-

<P>Carbon dots (CDs) are novel carbon-based nanomaterials with attractive optical and electronic properties and have become a focal point for tailoring electrochemical performances of energy storage devices. In this work, a pyrolysis method was developed for producing carbon dots from durian peel waste. The carbon dots exhibited blue fluorescence with a quantum yield of 11% and an average size of about 10 nm. Carbon dot-reinforced activated carbon (AC) was used to construct a composite electrode using poly (vinylidene fluoride) as a binder. From cyclic voltamogram, AC/CD composite electrode exhibited a 1.4 fold increase in the specific capacitance (about 60 F g<SUP>-1</SUP>), compared to that of the pure AC electrode (43 F g<SUP>-1</SUP>). This capacitance improvement is possibly due to the introduction of high surface-area carbon dots and pseudocapacitive behaviors offered by surface functional groups of carbon dots. These results indicate that carbon dots are effective dopants for improving the electrode properties and subsequently the supercapacitor performances. Converting durian peel waste into functional nanomaterials is also attractive from the various perspectives, offering a strategy that can be potentially applied for many other biomasses.</P>

Temperature-Responsive Crosslinked Materials Prepared from Natural Rubber and Poly(N-vinylcaprolactam)

Sopitcha Phetrong,Chanon Sansuk,Pramuan Tangboriboonrat,Peerasak Paoprasert 한국고분자학회 2017 Macromolecular Research Vol.25 No.8

A straightforward method for functionalizing natural rubber (NR) with poly(N-vinylcaprolactam) (PNVCL), a temperature-responsive polymer having lower critical solution temperature (LCST) near human body temperature, has been successfully developed using free radical crosslinking reaction. Effects of polymer and initiator concentrations, reaction temperature, and reaction time on immobilization percentage of the synthesized polymer were investigated. Results showed 100% immobilization percentage when using 100 phr of PNVCL, 10 phr of benzoyl peroxide at 75 °C within 36 h. For the temperature responsiveness, the water swelling, water contact angle, and dye release of the crosslinked NR were measured. Its LCST ca. 32-34 ˚C was close to that of the pristine PNVCL. The dye adsorption studies revealed the Langmuir isotherm indicating monolayer coverage. Dye release could be triggered by increasing the temperature above the LCST, suggesting its potential uses in drug release technology. In addition, this temperature-responsive NR would potentially be used as a novel responsive rubber-based material in various applications, such as sensors and biomedical materials.

Microwave-assisted synthesis of luminescent and biocompatible lysine-based carbon quantum dots

최유진,Nichaphat Thongsai,Ari Chae,조성호,강은비,Peerasak Paoprasert,박성영,인인식 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.47 No.-

Water-soluble carbon quantum dots presenting strong blue photoluminescence with the quantum yieldup to 23.3% are simply prepared by microwave treatment of lysine as a building block within 5 min inhousehold microwave oven. The formation of lysine-based carbon quantum dots is estimated to proceedthrough the microwave induced thermal polyamidation and the subsequent carbonization reaction. More importantly, the control experiments using the other amino acids having linear structures revealsthat the branched molecular structure of lysine (AB2 type polyamidation monomer) is one of prerequisitepoints to obtain strongly luminescent carbon quantum dots with high mass yield. Lysine-based carbonquantum dots are highly nontoxic and biocompatible, enabling bioimaging of cellular media with highdegree of pysiological safety.

Highly biocompatible yogurt-derived carbon dots as multipurpose sensors for detection of formic acid vapor and metal ions

Moonrinta, Sasaluck,Kwon, Binhee,In, Insik,Kladsomboon, Sumana,Sajomsang, Warayuth,Paoprasert, Peerasak Elsevier 2018 Optical materials Vol.81 No.-

<P><B>Abstract</B></P> <P>Carbon dots are fascinating nanomaterials given their straightforward synthesis, unique optical properties, sensing capabilities, and biocompatibility. In this work, biocompatible carbon dots were prepared from yogurt using a two-step pyrolysis/hydrothermal method. The dots were spherical in shape with an average size of 4.7 nm. They showed blue emission under UV illumination with a quantum yield of 1.5%. Their photoluminescence was stable over three months and in both strong buffer solutions and highly concentrated salt solutions. The optical absorption and photoluminescence properties of the dots were employed for vapor and metal ion sensing, respectively. For the first time, the carbon dots were integrated into an optical electronic nose, and used for the detection of formic acid vapor at room temperature. Sensing was based on monitoring the optical transmission through a carbon dot film upon exposure to vapor, and the results were confirmed by UV–visible spectroscopy. The carbon dot-integrated electronic nose was able to distinguish vapor from formic acid/water solutions at different concentrations, with a detection limit of 7.3% v/v. The sensitivity of the dots to metal ions was tested by measuring the photoluminescence emission intensity at different excitation wavelengths. Principal component analysis was used to differentiate between the ions. The results suggested that interactions between carbon dots and metals ions occurred at a range of binding sites. The biocompability of the dots was demonstrated to be excellent. The study identified carbon dots produced from yogurt as multipurpose fluorescent nanomaterials with potential sensing and biomedical applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Carbon dots were prepared from edible yogurt using solvothermal method. </LI> <LI> The biocompatibility and photostability of carbon dots were excellent. </LI> <LI> The photoluminescence of carbon dots was used as metal ion probe. </LI> <LI> Carbon dots were combined with optical electronic nose as formic acid vapor sensor. </LI> <LI> The sensing response towards formic acid vapor was by monitoring optical transmission. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Microwave-assisted synthesis of luminescent and biocompatible lysine-based carbon quantum dots

Choi, Yujin,Thongsai, Nichaphat,Chae, Ari,Jo, Seongho,Kang, Eun Bi,Paoprasert, Peerasak,Park, Sung Young,In, Insik Elsevier 2017 Journal of industrial and engineering chemistry Vol.47 No.-

<P><B>Abstract</B></P> <P>Water-soluble carbon quantum dots presenting strong blue photoluminescence with the quantum yield up to 23.3% are simply prepared by microwave treatment of lysine as a building block within 5min in household microwave oven. The formation of lysine-based carbon quantum dots is estimated to proceed through the microwave induced thermal polyamidation and the subsequent carbonization reaction. More importantly, the control experiments using the other amino acids having linear structures reveals that the branched molecular structure of lysine (AB<SUB>2</SUB> type polyamidation monomer) is one of prerequisite points to obtain strongly luminescent carbon quantum dots with high mass yield. Lysine-based carbon quantum dots are highly nontoxic and biocompatible, enabling bioimaging of cellular media with high degree of pysiological safety.</P> <P><B>Highlights</B></P> <P> <UL> <LI> CQDs showing strong fluorescence are simply prepared from lysine through microwave assisted pyrolysis. </LI> <LI> Lysine-based CQDs are less than 10nm and have amorphous carbonic cores and amine and hydroxyl functionality in their surface. </LI> <LI> The use of lysine as an AB2 type amino acid possessing branching point is the key for the successful synthesis CQDS. </LI> <LI> Lysine-based CQDs are highly nontoxic and biocompatible, enabling bioimaging of cellular media with high degree of physiological safety. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Assembly of chemically reduced graphene oxide with folic acid functionalized with pyrene moieties and electrochemical sensing of folate receptors

Binhee Kwon,Jongyeap Park,Woojun Jeong,Guembi Jeong,Hyeong Seon Ryu,Peerasak Paoprasert,Sung Young Park,Insik In 한국탄소학회 2018 Carbon Letters Vol.27 No.-

To formulate folate receptor (FR)-specific graphene-based electrochemical electrodes, a folic acid (FA) derivative attached with two pyrene molecules on the glutamate tail of FA was synthesized. The resulting pyrene-functionalized FA (FA-Py) presented the spontaneous noncovalent binding on chemically reduced graphene oxides (rGO) through an π-π interaction. Ultrathin morphology, high water-resistance, and preservation of intact FR-specific pteroates from the rGO/FA-Py assembly allow this assembly to be exploited as robust and FR-specific electrochemical electrode materials. The limits of detecting rGO/FA-Py modified electrodes were found to be as low as 3.07 nM in FR concentrations in cyclic voltammetry analysis