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Publication Metadata only Enhanced electrical conductivity of ceria electrolyte doped with samarium (Ce0.8− x Zrx Sm0.2 O2−δ ) for solid oxide fuel cells(2021-09-01) Bradha Madhavan; Nagaraj Balakrishnan; Branesh Pillai; Ananth Steephen; Rathinam Technical Campus; KPR Institute of Engineering and Technology; Mahidol Universityof CeO2 as 20 nm. Valence state of cations and concentration of Ce4+ are proven through X-ray photo electron spectroscopy (XPS). This result confirms 50% upsurge in tetravalent Cerium concentration (from 56 to 84%) which influences the ionic conductivity...To affluence the ionic conductivity enhancement in Cerium Oxide (CeO2) for low temperature solid oxide fuel cells (LT-SOFCs), we report synthesis of Zr substituted, Samarium doped Ceria (SDC) via chemical procedure. Substitution of Zr has assistedPublication Metadata only First-principles study of effects of combined ti supervalent cations and lithium ion vacancies doping on crystal and electronic structures and conductivity in lifepo4(2020-01-01) Chanaprom Cholsuk; Sujin Suwanna; Worasak Sukkabot; Wutthikrai Busayaporn; Pimsiree Suwanna; Ubon Ratchathani University; Kasetsart University; Mahidol University; Synchrotron Light Research Instituteband (cNEB) calculation shows that Li hopping can be promoted by doping with high Ti concentration. This co-doping mechanism therefore can enhance both the electronic and ionic conductivities, which can be beneficial benchmark for cathode-material... to poor electronic and ionic conductivity. To investigate the conductivity enhancement of LiFePO4, first-principles method under the GGA+U framework is implemented to study effects of doping with Ti4+ at Fe2+ sites under the lithium-deficient environmentPublication Metadata only Preparation of cyclized deproteinized natural rubber in latex state via a combination of benzotrichloride and sulfuric acid system, and its properties(2007-01-01) Sa Ad Riyajan; Yasuyuki Tanaka; Jitladda T. Sakdapipanich; Prince of Songkla University; Mahidol University; The Institute of Science and Technology for Research and Development, Mahidol UniversityPartially cyclized deproteinized natural rubber (DPNR) in latex form was successfully prepared by using a combination of sulfuric acid (H2SO4) and benzotrichloride (PhCCl3) in the presence of Terric 320 as a non-ionic surfactant. The main parameters... of the cyclization process such as various reaction times, dry rubber contents, concentrations of catalyst and temperatures were investigated. The resulting rubber was subjected to characterization by proton Nuclear Magnetic Resonance (1H-NMR), Fourier-TransformPublication Metadata only Prevulcanisation of skim latex: Morphology and its use in natural rubber based composite material(2005-12-01) Umaporn Paiphansiri; Pramuan Tangboriboonrat; Mahidol UniversityThe prevulcanisation of skim latex, a by-product of field natural rubber (NR) latex concentrated by centrifugation, using sulphur and peroxide systems was investigated. Compared to the peroxide prevulcanisation, the lower swelling ratio of film...) (PEO) moieties of a non-ionic surfactant (Nonidet) adsorbed on small SPVS particles and the indigenous surfactant (protein-lipid) on a large NR particle. The value of zeta potential of heterocoagulated particle and the better oil resistance of filmsPublication Metadata only Adsorption of polystyrene-poly(4-vinylpyridine) diblock copolymer on the assembled latex film(2005-07-01) S. Sangribsub; P. Tangboriboonrat; T. Pith; G. Decher; Mahidol University; Institut Charles Sadroncopolymer (PS-PVPy) dissolved in tetrahydrofuran, the contact angle value indicated that the PS-PVPy could be adsorbed on the film to provide PS block at the outermost layer. The selective solvent, block length of PVPy, latex concentration, immersion time... and ionic strength of aqueous solution of poly(allylamine hydrochloride) (PAH) previously adsorbed on the substrate showed influence on the adsorption of the block copolymer and, hence, the contact angle of the film. © 2005 Elsevier Ltd. All right reserved.Item Metadata only A Label-Free Electrochemical Biosensor for Homocysteine Detection Using Molecularly Imprinted Polymer and Nanocomposite-Modified Electrodes(2023-05-01) Kongintr U.; Lertanantawong B.; Promptmas C.; Mahidol University/chitosan/ionic liquid compound (CNT/CS/IL) nanocomposite on the surface of a screen-printed carbon electrode (SPCE). It showed high sensitivity, with a linear response of 5.0 to 150 µM (R2 of 0.9753) and with a limit of detection (LOD) at 1.2 µ...M. It demonstrated low cross-reactivity with ascorbic acid, cysteine, and methionine. Recoveries of 91.10–95.83% were achieved when the Hcy-MIP biosensor was used for Hcy at 50–150 µM concentrations. The repeatability and reproducibility of the biosensor at the HcyPublication Metadata only Gel formation in natural rubber latex: 2. Effect of magnesium ion(2003-01-01) L. Tarachiwin; J. T. Sakdapipanich; Y. Tanaka; Mahidol Universitythe same treatment showed little change on FL-latex, 0.035%. The toluene soluble fraction of these latices showed a decrease in the Mnvalue with an increase in the (NH4)2SO4concentration. The gel content of FL- and HA-lattices increased with an increasing... storage period in the presence and absence of (NH4)2SO4. The initial rate of increase in the gel content was slow in the case of FL-latex. These findings indicate that the gel fraction in HA-latex is partly formed by ionic crosslinks caused by Mg2+ionsPublication Metadata only Clindamycin hydrochloride-loaded composite hydrogel of poly((ethylene glycol) dimethacrylate-glycidyl methacrylate) and mesoporous silica nanoparticles for bacterial infection treatment(2020-01-01) Piyarat Sungkhaphan; Boonlom Thavornyutikarn; Pakkanun Kaewkong; Weerachai Singhatanadgit; Soraya Pornsuwan; Wanida Janvikul; Thailand National Metal and Materials Technology Center; Mahidol University; Thammasat Universityinto and released from the specimen, when water was used as drug loading medium. The contents of CDM loaded and released were, however, considerably raised as a function of ion concentration of SBF used, indicating the ionic interactions among CDM, MSNs, and SBF.... Then, individual hydrogels were immersed in 0.5 mL of aqueous clindamycin hydrochloride (CDM, 20 mg/mL), mixed with or without simulated body fluid (SBF) used at different ion concentrations, at 37oC for 3 days. The amounts of CDM loaded into and released from eachItem Metadata only Enzyme-functionalized hydrogel film for extracorporeal uric acid reduction(2024-02-01) Pantakitcharoenkul J.; Touma J.; Jovanovic G.; Coblyn M.; Pantakitcharoenkul J.; Mahidol University.98 × 10−11 m2/s compared with alginate prepared solely from ionic crosslinking with (Formula presented.) 5.31 × 10−12 m2/s at the same alginate concentration. The maximum value of νmax was experimentally determined at 7.78 × 10−5 mol/(m3s). A 3% sodiumItem Metadata only Single-Molecule Analysis of SARS-CoV-2 Double-Stranded Polynucleotides Using Solid-State Nanopore with AI-Assisted Detection and Classification: Implications for Understanding Disease Severity(2023-01-01) Alam I.; Boonkoom T.; Pitakjakpipop H.; Boonbanjong P.; Loha K.; Saeyang T.; Vanichtanankul J.; Japrung D.; Alam I.; Mahidol Universityinfection. By examining ionic current signals during DNA translocation, we revealed the dynamic interactions and structural characteristics of these nucleotide sequences and also quantified their abundance. Nanopores of sizes 3 and 10 nm were efficiently... fabricated and characterized, ensuring an optimal experimental approach. Our results showed a clear relationship between DNA capture rates and concentration, proving our method’s effectiveness. Notably, longer DNA sequences had higher capture rates