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Amornkitbamrung, Lunjakorn,Kim, Jeonghun,Roh, Yeonggon,Chun, Sang Hun,Yuk, Ji Soo,Shin, Seung Won,Kim, Byung-Woo,Oh, Byung-Keun,Um, Soong Ho American Chemical Society 2018 Langmuir Vol.34 No.8
<P>A novel and simple method for the fabrication of gold nanoparticle (AuNP) clusters was introduced for use as an efficient near-infrared (NIR) photothermal agent. Cationic surfactants were employed to assemble AuNPs into clusters, during which polyvinylpyrrolidone (PVP) was used to stabilize the AuNP clusters. Through this manner, AuNP clusters with a uniform shape and a narrow size distribution (55.4 ± 5.0 nm by electron microscope) were successfully obtained. A mechanism for the formation of AuNP clusters was studied and proposed. Electrostatic interactions between AuNPs and cationic surfactants, hydrophobic interactions between hydrocarbon chains of cationic surfactants, and repulsive steric interactions of PVP were found to play an important role with regard to the formation mechanism. Photothermal effect in the NIR range of the AuNP clusters was demonstrated; results presented a highly efficient photothermal conversion (with a maximum η of 65%) of the AuNP clusters. The clusters could be easily coated by a silica layer, enabling their biocompatibility and colloidal stability in physiological fluids. The easy-to-fabricate AuNP clusters showed high potential of use as an NIR photothermal agent for cancer therapy.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/langd5/2018/langd5.2018.34.issue-8/acs.langmuir.7b03778/production/images/medium/la-2017-03778r_0009.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/la7b03778'>ACS Electronic Supporting Info</A></P>
( Urasawadee Amornkitbamrung ),유필진 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
Herein, inversed opal (IO) structures were modified with polydopamine (PDA)/inorganic coating layer as a promising separator for high-performance lithium ion battery (LIB). Precisely ordered nanoporous IO was fabricated by inverse replica of colloidal polystyrene particles and modified thereafter PDA/inorganic layer on the IO can induce hydrophilicity which improved the electrolyte uptake and ionic conductivity of separator, resulting in excellent rate capability and cycle stability. Moreover, the hybrid layer solved the safety issue at high temperature. As a result, IO separator with PDA/inorganic achieved the significantly enhanced electrochemical performance.
Paveena Laokul,Vittaya Amornkitbamrung,Supapan Seraphin,Santi Maensiri 한국물리학회 2011 Current Applied Physics Vol.11 No.1
This study reports the simple synthesis of MFe_2O_4 (where M = Cu, Ni, and Zn) nanoparticles by a modified sol-gel method using high purity metal nitrates and aloe vera plant extracted solution. Using of aloe vera extract simplifies the process and provides an alternative process for a simple and economical synthesis of nanocrystalline ferrites. The obtained precursors were characterized by TG/DTA to determine the thermal decomposition and subsequently were cc at different temperatures in the range of 600―900 ℃ for 2 h to obtain the ferrite nanoparticles. The calcined samples were characterized by XRD, FT-IR, SEM, and TEM. All the prepared samples are polycrystalline and have spinel structure with crystallite sizes of 15―70 nm. The crystallite size increases with increasing the calcination temperature. Magnetic properties of the prepared ferrite samples were measured using Vibrating sample magnetometer (VSM). The room temperature magnetic behavior of as-prepared ferrite powders can be explained as the results of the three important factors: impurity phase of a-Fe_2O_3, cationic distribution in spinel structure, and the surface spin structure of nanoparticles.
( Panitat Hasin ),( Vittaya Amornkitbamrung ),( Narong Chanlek ) 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1
Nanocomposites of cobalt or nickel species and N-doped mesoporous carbon as well as tungsten carbide imbedded in N-doped hierarchical hollow mesoporous carbon were prepared for replacing Pt as the electrocatalysts on the counter electrodes (CEs) of dye-sensitized solar cells (DSCs). It is shown that the obtained nanocomposite carbon materials significantly improve the electrocatalytic activity toward the reduction of I<sub>3</sub><sup>-</sup> compared to bared porous carbons. The prepared nanocomposite carbon materials with enhanced electrochemical stability are the benefit to combining high electrical conductivity and electrocatalytic activity into one material in which Co or Ni species as well as WC serve as the electrocatalysts and N-doped mesoporous carbon as well as N-doped hierarchical hollow mesoporous carbon serves as the electrical conductors. The fabricated nanocomposite carbon materials based DSCs show the best light-to-electricity conversion efficiency (η) which are higher than those of the cells with bared porous carbons CEs and are comparable to that of the cell with a platinized CE.
Chun, Sang Hun,Shin, Seung Won,Amornkitbamrung, Lunjakorn,Ahn, So Yeon,Yuk, Ji Soo,Sim, Sang Jun,Luo, Dan,Um, Soong Ho American Chemical Society 2018 Langmuir Vol.34 No.43
<P>The magnetic properties of nanoparticles make them ideal for using in various applications, especially in biomedical applications. However, the magnetic force generated by a single nanoparticle is low. Herein, we describe the development of nanocomplexes (size of 100 nm) of many iron oxide nanoparticles (IONPs) encapsulated in poly(lactic-<I>co</I>-glycolic acid) (PLGA) using the simple method of emulsion solvent evaporation. The response of the IONP-encapsulated PLGA nanocomplexes (IPNs) to an external magnetic field could be controlled by modifying the amount of IONPs loaded into each nanocomplex. In a constant size of IPNs, larger loading numbers of IONPs resulted in more rapid responses to a magnetic field. In addition, nanocomplexes were coated with a silica layer to facilitate the addition of fluorescent dyes. This allowed visualization of the responses of the IPNs to an applied magnetic field corresponding to the IONP loading amount. We envision that these versatile, easy-to-fabricate IPNs with controllable magnetism will have important potential applications in diverse fields.</P> [FIG OMISSION]</BR>
Enhanced Specific Capacitance of an Electrophoretic Deposited MnO2-Carbon Nanotube Supercapacitor
Patin Tagsin,Pawinee Klangtakai,Viyada Harnchana,Vittaya Amornkitbamrung,Samuk Pimanpang,Pisist Kumnorkaew 한국물리학회 2017 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.71 No.12
MnO2 and MnO2-carbon nanotubes (CNT) composite films were grown directly on stainless- steel substrates using an electrophoretic process employing supercapacitor electrodes. An electrophoretic MnO2 film with a nanoplate-like structure was observed using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Supercapacitor performance was studied using cyclic voltammetry (CV), charge-discharge (CD) and electrochemical impedance spectroscopy (EIS). The specific capacitance (SC) of the electrophoretic MnO2 film was 60 F/g at 1 A/g, with a 38.33% retention of the initial SC values after 1000 cycles. The low SC value of the MnO2 films was attributed to the high series and charge-transfer resistances of 1.70 and 3.20, respectively. The MnO2-CNT composites with the addition of 0.04, 0.06 and 0.08 g CNT to the electrophoretic MnO2 film were found to greatly increase the SC to 300, 206 and 169 F/g at 1 A/g, respectively. The series and charge-transferred resistances of MnO2-CNT composite films decreased to 1.38 - 1.52 and 2.62 - 2.86 , respectively. The SC improvement of the composite electrodes was attributed to presence of two active storage materials (MnO2 and CNT), a high film specific surface area and electrical conductivity.