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Lee, You Jeong,Ahn, Eun-Young,Park, Youmie Springer US 2019 NANOSCALE RESEARCH LETTERS Vol.14 No.1
<P>In the present report, three different shapes of chitosan-capped gold nanoparticles (nanospheres, nanostars, and nanorods) were synthesized to investigate the effects of shape on cytotoxicity and cellular uptake in cancer cells. Green tea extract was utilized as a reducing agent to reduce gold salts to gold nanospheres. Gold nanostars were prepared using an as-prepared nanosphere solution as a seed solution. Gold nanorods were synthesized using a conventional method. All three types of gold nanoparticles showed their characteristic surface plasmon resonance bands upon UV-visible spectrophotometry. In high-resolution transmission electron microscopy images, lattice structures were clearly observed in all three shapes, confirming the crystalline nature of the nanoparticles. All three colloidal solutions of gold nanoparticles retained colloidal stability in various solutions. To assess cytotoxicity, the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay was performed on four cancer cell lines. The cytotoxicity was the highest in nanorods, followed by nanostars and finally nanospheres. The cellular uptake of gold nanoparticles in human hepatocyte carcinoma cells (HepG2) was measured, and the results followed the order nanospheres > nanorods > nanostars. The outcomes of the current study may assist in the shape design of gold nanoparticles for therapeutic applications as drug delivery vehicles in the field of nanomedicine.</P>
Gold nanostar-mediated neural activity control using plasmonic photothermal effects
Lee, Jee Woong,Jung, Hyunjun,Cho, Hui Hun,Lee, Jung Heon,Nam, Yoonkey Elsevier 2018 Biomaterials Vol.153 No.-
<P><B>Abstract</B></P> <P>Nanomaterials have emerged as an essential tool for the understanding of cellular level mechanism in the fields of biology and medical science. Recently, researchers have been studying the regulation of neuronal activity using plasmonic nanoparticles and light, and it has been reported that photothermal effects could lead to both excitation and inhibition of neuronal cells. So far, only a few photothermal transducers have been applied to modulate neural activity. In this paper, we synthesized biocompatible gold nanostars (AuNSs) which generate heat by absorbing near-infrared (NIR) light. And we used the AuNS to inhibit the activity of neurons through light stimulation. We have demonstrated that AuNS inhibits the neural activity by NIR laser in both chip-attached mode and cell-attached mode. We also confirmed the suppression of single neuron signal by using digital micromirror device (DMD) set up. This approach is possible to inhibit the neural firing by controlling the intensity of light, and overcome the disadvantages of conventional electrochemical stimulation methods. This method of NIR-mediated stimulating neurons using light sensitive AuNS will be a powerful tool for neuromodulation researches and neuroscience studies.</P>
Dye sensitized solar cells based on hydrothermally grown TiO<sub>2</sub> nanostars over nanorods
Pawar, Udayraj T.,Pawar, Sachin A.,Kim, Jin-Hyeok,Patil, Pramod S. Elsevier 2016 CERAMICS INTERNATIONAL Vol.42 No.7
<P><B>Abstract</B></P> <P>A rutile titanium dioxide nanostar over nanorods is synthesized by a simple and cost-effective hydrothermal deposition method onto conducting glass substrates. In order to study the effect of precursor concentrations on the growth of TiO<SUB>2</SUB>, the amount of Ti precursor is varied from 0.1mL to 0.5mL at the interval of 0.1mL. These TiO<SUB>2</SUB> thin films are characterized for their morphological, structural, optical and <I>J</I>–<I>V</I> properties using various characterization techniques. SEM images showed the formation of densely packed nanostars over nanorods for 0.3mL titanium tetraisopropoxide (TTIP). XRD patterns show the formation of polycrystalline TiO<SUB>2</SUB> with tetragonal crystal structure possessing rutile phase. Further, the TiO<SUB>2</SUB> thin films are used for dye sensitized solar cells using N3-dye.</P> <P>The films were photoelectrochemically active and can be viewed as a promising application in DSSC with maximum current density of 1.459mA/cm<SUP>2</SUP> with enhanced photovoltage of 696mV for the sample prepared at 0.3mL TTIP.</P>
Fabrication of mesoporous silica-covered gold nanostars for chemophototherapy
Jun Hou,Yanbao Zhao,Lei Sun,Xueyan Zou 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
Gold nanomaterials have attracted great interest in the fight against cancer due to their surface features. In this study, gold nanostar (GNS) cloaked with mesoporous silica (GNS@mSiO2) carriers were preparedfor controlled drug release. The GNS core presents a branched morphology with tip-to-tip diameter of80–120 nm and core of 40–60 nm. In this system, GNS not only served as photothermal agent but alsoas Raman signal enhancement matrix. After encapsulating doxorubicin (DOX) within the GNS@mSiO2carrier, hyaluronic acid (HA) was coated on the GNS@mSiO2 surface to seal the loaded-drug of channels. The obtained DOX-GNS@mSiO2/HA displayed pH/enzyme-triggered drug release and photothermalchemotherapeutic effect.
Hang Zhao,Xiaowei Cao,Man Wang,Lin Tao,Xiaoyu Pan,Chunwei Yuan,Weiping Qian 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2015 NANO Vol.10 No.3
In this paper, we report a novel antibody conjugated gold nanostars (AuNSs) as surface-enhanced Raman spectroscopy (SERS) probes for distinguishing cancer cells (A549 cells, H1229 cells) from normal cells (ATII cells). In such a probe, bovine serum albumin (BSA) was served as the protective agent and stabilizing agent, 4-mercaptobenzoic acid (4-MBA) was used as the Raman reporter to generate SERS signals as well as the conjugation agent for attaching CD44 antibody (anti-CD44) molecules to AuNSs, where anti-CD44 could effectively target to CD44 protein overexpressed cells. All the results of the experiments con¯rmed that more SERS probes have been targeted to cancer cells (A549 cells and H1229 cells) than that of normal cells (ATII cells) under the same condition. The anti-CD44 SERS probes hold a potential application in distinguishing cancer cells from normal cells with high sensitivity and good biocompatibility.
THE RANDIC INDEX OF SOME DENDRIMER NANOSTARS
Ali Madanshekaf 한국전산응용수학회 2011 Journal of applied mathematics & informatics Vol.29 No.5
Among the numerous topological indices considered in chemical graph theory, only a few have been found noteworthy in practical application, Randic index is one of them. The dendrimer nanostars is a synthesized molecule built up from branched unit called monomers. In this article, we compute the Randic index of two types of polymer dendrimers and a fullerene dendrimer.
THE RANDI$\acute{C}$ INDEX OF SOME DENDRIMER NANOSTARS
Madanshekaf, Ali The Korean Society for Computational and Applied M 2011 Journal of applied mathematics & informatics Vol.29 No.5
Among the numerous topological indices considered in chemical graph theory, only a few have been found noteworthy in practical application, Randi$\acute{c}$ index is one of them. The dendrimer nanostars is a synthesized molecule built up from branched unit called monomers. In this article, we compute the Randi$\acute{c}$ index of two types of polymer dendrimers and a fullerene dendrimer.
Le, Thi Thao Nguyen,Ly, Nguyen Hoang,Nguyen, Thanh Danh,Nguyen, Thi Ha,Kim, Moon-Kyung,Zoh, Kyung-Duk,Joo, Sang-Woo Elsevier 2018 Colloids and surfaces. A, Physicochemical and engi Vol.551 No.-
<P><B>Abstract</B></P> <P>For this report, we compared interfacial spectroscopic tools to monitor in situ Fenton reactions of organic dyes on ascorbic acid-reduced gold nanostars (AuNSs). Ultraviolet-visible (UV–vis) absorption and Raman spectroscopic tools were introduced to check the hydroxyl radical destruction of ethyl violet (EV), which contains a triarylmethane group. AuNSs with sharp edges, tips, and corners were used as efficient surface-enhanced resonance Raman scattering (SERRS) substrates for in situ Fenton reaction monitoring. The SERRS intensity of the EV showed a first-order decay curve with a reaction rate constant value of 0.0263 min<SUP>−1</SUP>, while the decolorization yielded second-order kinetic behavior with a constant value of 0.00430 L/mol min. In addition to the destruction of the organic dyes, the increased number of ferric (III) ions, as a result of the Fenton reactions, was detected via 4-aminobenzo-15-crown-5 (4AB15C5) conjugated with 4-mercaptobenzoic acid (4MBA). We found that the SERRS bands at ∼1500 cm<SUP>−1</SUP> of 4AB15C5 on AuNSs increased after treatment with H<SUB>2</SUB>O<SUB>2</SUB> and FeSO<SUB>4</SUB>. Real industrial textile wastewater samples were then tested to determine whether this Raman method could be applied to detect increases in ferric ions. Our spectroscopic data used SERRS peaks via Fenton reaction results to calculate an estimated ∼65% destruction of the organic dyes.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>