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Nano Convergence

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https://www.readbyqxmd.com/read/30175032/surface-modification-of-fe-2-o-3-and-mgo-nanoparticles-with-agrowastes-for-the-treatment-of-chlorosis-in-glycine-max
#1
Abdul Azeez Nazeer, Sreelakshmi Udhayakumar, Saranpriya Mani, Mothilal Dhanapal, Sudarshana Deepa Vijaykumar
Surface modification of nanoparticles for biological applications is receiving enormous interest among the research community due to the ability to alchemy the toxic nanoparticles into biocompatible compounds. In this study, the agrowastes of Moringa oleifera and Coriandrum sativum were used to surface modify the magnesium oxide nanoparticles and ferric oxide nanoparticles respectively. The agrowaste amended magnesium oxide nano particles (AMNP) and agrowaste amended ferric oxide nanoparticles (AFNP) were characterized using scanning electron microscope, X-ray diffractometer, Fourier transformed-infra red spectroscope to justify the formation and surface modification of nanoparticles with the organic functional groups from the agro wastes...
December 2018: Nano Convergence
https://www.readbyqxmd.com/read/30148043/a-comparative-experimental-study-on-the-cross-plane-thermal-conductivities-of-nano-constructed-sb-2-te-3-cu-ag-au-pt-thermoelectric-multilayer-thin-films
#2
Gang Yang, Jiahui Pan, Xuecheng Fu, Zhiyu Hu, Ying Wang, Zhimao Wu, Erzhen Mu, Xue-Jun Yan, Ming-Hui Lu
Thermoelectric multilayer thin films used in nanoscale energy conversion have been receiving increasing attention in both academic research and industrial applications. Thermal transport across multilayer interface plays a key role in improving thermoelectric conversion efficiency. In this study, the cross-plane thermal conductivities of nano-constructed Sb2 Te3 /(Cu, Ag, Au, Pt) thermoelectric multilayer thin films have been measured using time-domain thermoreflectance method. The interface morphology features of multilayer thin film samples were characterized by using scanning and transmission electron microscopes...
December 2018: Nano Convergence
https://www.readbyqxmd.com/read/30148042/sorption-of-btex-on-a-nanoporous-composite-of-sba-15-and-a-calcined-hydrotalcite
#3
Alvaro Sampieri, Gabriela Pérez-Osorio, Miguel Ángel Hernández-Espinosa, Irving Israel Ruiz-López, Mayra Ruiz-Reyes, Janette Arriola-Morales, Rocío Iliana Narváez-Fernández
Benzene, toluene, ethylbenzene, and p -xylene (BTEX) are hazardous volatile organic compounds mostly released from fuel combustion, paint gas emissions, and biomass burning. In this work, it is studied the BTEX sorption influence on the surface reactivity of a new kind of nanoporous composite, prepared via an in situ functionalization of SBA-15 with a Mg-Al calcined hydrotalcite (HTC ). During its preparation, Mg/Al mixed oxides are indeed formed and dispersed on the SBA-15 surface with non-blockage porosity...
December 2018: Nano Convergence
https://www.readbyqxmd.com/read/30101053/hybrid-dielectrics-composed-of-al-2-o-3-and-phosphonic-acid-self-assembled-monolayers-for-performance-improvement-in-low-voltage-organic-field-effect-transistors
#4
Sukjae Jang, Dabin Son, Sunbin Hwang, Minji Kang, Seoung-Ki Lee, Dae-Young Jeon, Sukang Bae, Sang Hyun Lee, Dong Su Lee, Tae-Wook Kim
Low voltage operational organic transistors (< 4 V) based on pentacene were successfully fabricated with hybrid dielectric films composed of aluminum oxide using atomic layer deposition and various phosphonic acid-based self-assembled monolayers as the gate dielectrics. High capacitances up to 279 nF/cm2 , low leakage current densities of 10-8  A/cm2 at 6 V, and high breakdown fields up to 7.5 MV/cm were obtained. The transistors with the octadecylphosphonic acid hybrid dielectric exhibited an improved saturation mobility of 0...
2018: Nano Convergence
https://www.readbyqxmd.com/read/30101052/monolithic-nano-porous-polymer-in-microfluidic-channels-for-lab-chip-liquid-chromatography
#5
Jin-Young Kim, Danny O'Hare
In this paper, a nano-porous polymer has been integrated into the microfluidics device as on-chip monolithic liquid chromatography column for separation of chemical and biological samples. Monolithic nano-porous polymer (MNP) was formed and firmly grafted on the surface of the microfluidic channel. Neurotransmitters, 5-hydroxyindole-3-acetic acid (5-HIAA) and 5-hydroxytryptamine (serotonin, 5-HT), were successfully separated with the developed on-chip MNP column.
2018: Nano Convergence
https://www.readbyqxmd.com/read/30101051/involvement-of-high-valent-manganese-oxo-intermediates-in-oxidation-reactions-realisation-in-nature-nano-and-molecular-systems
#6
REVIEW
Mani Balamurugan, Natarajan Saravanan, Heonjin Ha, Yoon Ho Lee, Ki Tae Nam
Manganese plays multiple role in many biological redox reactions in which it exists in different oxidation states from Mn(II) to Mn(IV). Among them the high-valent manganese-oxo intermediate plays important role in the activity of certain enzymes and lessons from the natural system provide inspiration for new developments of artificial systems for a sustainable energy supply and various organic conversions. This review describes recent advances and key lessons learned from the nature on high-valent Mn-oxo intermediates...
2018: Nano Convergence
https://www.readbyqxmd.com/read/30046512/boron-nitride-nanotubes-synthesis-and-applications
#7
REVIEW
Jun Hee Kim, Thang Viet Pham, Jae Hun Hwang, Cheol Sang Kim, Myung Jong Kim
Boron nitride nanotube (BNNT) has similar tubular nanostructure as carbon nanotube (CNT) in which boron and nitrogen atoms arranged in a hexagonal network. Owing to the unique atomic structure, BNNT has numerous excellent intrinsic properties such as superior mechanical strength , high thermal conductivity, electrically insulating behavior, piezoelectric property, neutron shielding capability, and oxidation resistance. Since BNNT was first synthesized in 1995, developing efficient BNNT production route has been a significant issue due to low yield and poor quality in comparison with CNT, thus limiting its practical uses...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29930894/loosely-bound-low-loss-surface-plasmons-in-hyperbolic-metamaterial
#8
Yu Shi, Hong Koo Kim
Surface plasmons (SPs) carry electromagnetic energy in the form of collective oscillation of electrons at metal surface and commonly demonstrate two important features: strong lateral confinement and short propagation lengths. In this work we have investigated the trade-off relationship existing between propagation length and lateral confinement of SP fields in a hyperbolic metamaterial system, and explored loosening of lateral confinement as a means of increasing propagation length. By performing finite-difference time-domain analysis of Ag/SiO2 thin-film stacked structure we demonstrate long range (~ 100 mm) propagation of SPs at 1...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29904621/flexible-nanopillar-based-electrochemical-sensors-for-genetic-detection-of-foodborne-pathogens
#9
Yoo Min Park, Sun Young Lim, Soon Woo Jeong, Younseong Song, Nam Ho Bae, Seok Bok Hong, Bong Gill Choi, Seok Jae Lee, Kyoung G Lee
Flexible and highly ordered nanopillar arrayed electrodes have brought great interest for many electrochemical applications, especially to the biosensors, because of its unique mechanical and topological properties. Herein, we report an advanced method to fabricate highly ordered nanopillar electrodes produced by soft-/photo-lithography and metal evaporation. The highly ordered nanopillar array exhibited the superior electrochemical and mechanical properties in regard with the wide space to response with electrolytes, enabling the sensitive analysis...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29755926/challenges-in-paper-based-fluorogenic-optical-sensing-with-smartphones
#10
REVIEW
Tiffany-Heather Ulep, Jeong-Yeol Yoon
Application of optically superior, tunable fluorescent nanotechnologies have long been demonstrated throughout many chemical and biological sensing applications. Combined with microfluidics technologies, i.e. on lab-on-a-chip platforms, such fluorescent nanotechnologies have often enabled extreme sensitivity, sometimes down to single molecule level. Within recent years there has been a peak interest in translating fluorescent nanotechnology onto paper-based platforms for chemical and biological sensing, as a simple, low-cost, disposable alternative to conventional silicone-based microfluidic substrates...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29755925/recent-developments-of-nano-structured-materials-as-the-catalysts-for-oxygen-reduction-reaction
#11
REVIEW
SungYeon Kang, HuiJung Kim, Yong-Ho Chung
Developments of high efficient materials for electrocatalyst are significant topics of numerous researches since a few decades. Recent global interests related with energy conversion and storage lead to the expansion of efforts to find cost-effective catalysts that can substitute conventional catalytic materials. Especially, in the field of fuel cell, novel materials for oxygen reduction reaction (ORR) have been noticed to overcome disadvantages of conventional platinum-based catalysts. Various approaching methods have been attempted to achieve low cost and high electrochemical activity comparable with Pt-based catalysts, including reducing Pt consumption by the formation of hybrid materials, Pt-based alloys, and not-Pt metal or carbon based materials...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29755924/dual-nozzle-microfluidic-droplet-generator
#12
Ji Wook Choi, Jong Min Lee, Tae Hyun Kim, Jang Ho Ha, Christian D Ahrberg, Bong Geun Chung
The droplet-generating microfluidics has become an important technique for a variety of applications ranging from single cell analysis to nanoparticle synthesis. Although there are a large number of methods for generating and experimenting with droplets on microfluidic devices, the dispensing of droplets from these microfluidic devices is a challenge due to aggregation and merging of droplets at the interface of microfluidic devices. Here, we present a microfluidic dual-nozzle device for the generation and dispensing of uniform-sized droplets...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29721403/nanostructured-surfaces-for-analysis-of-anticancer-drug-and-cell-diagnosis-based-on-electrochemical-and-sers-tools
#13
REVIEW
Waleed A El-Said, Jinho Yoon, Jeong-Woo Choi
Discovering new anticancer drugs and screening their efficacy requires a huge amount of resources and time-consuming processes. The development of fast, sensitive, and nondestructive methods for the in vitro and in vivo detection of anticancer drugs' effects and action mechanisms have been done to reduce the time and resources required to discover new anticancer drugs. For the in vitro and in vivo detection of the efficiency, distribution, and action mechanism of anticancer drugs, the applications of electrochemical techniques such as electrochemical cell chips and optical techniques such as surface-enhanced Raman spectroscopy (SERS) have been developed based on the nanostructured surface...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29682442/green-synthesis-of-nerium-oleander-conjugated-gold-nanoparticles-and-study-of-its-in-vitro-anticancer-activity-on-mcf-7-cell-lines-and-catalytic-activity
#14
Abir Chandan Barai, Koushik Paul, Aditi Dey, Subhankar Manna, Somenath Roy, Braja Gopal Bag, Chiradeep Mukhopadhyay
The phytochemicals present in the stem bark extract of Nerium oleander (commonly known as Karabi) have been utilized for the green synthesis of stable gold-conjugated nanoparticles at room temperature under very mild conditions. The green synthesized gold-conjugated nanoparticles were characterized by surface plasmon resonance spectroscopy, High resolution transmission electron microscopy, X-ray diffraction studies and dynamic light scattering. A mechanism for the synthesis and stabilization of gold-conjugated nanoparticles (AuNPs) has been proposed...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29670832/innovations-in-biomedical-nanoengineering-nanowell-array-biosensor
#15
REVIEW
YoungTae Seo, Sunil Jeong, JuKyung Lee, Hak Soo Choi, Jonghan Kim, HeaYeon Lee
Nanostructured biosensors have pioneered biomedical engineering by providing highly sensitive analyses of biomolecules. The nanowell array (NWA)-based biosensing platform is particularly innovative, where the small size of NWs within the array permits extremely profound sensing of a small quantity of biomolecules. Undoubtedly, the NWA geometry of a gently-sloped vertical wall is critical for selective docking of specific proteins without capillary resistances, and nanoprocessing has contributed to the fabrication of NWA electrodes on gold substrate such as molding process, e-beam lithography, and krypton-fluoride (KrF) stepper semiconductor method...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29607289/plasmonic-photocatalyst-like-fluorescent-proteins-for-generating-reactive-oxygen-species
#16
REVIEW
Jung Woo Leem, Seong-Ryul Kim, Kwang-Ho Choi, Young L Kim
The recent advances in photocatalysis have opened a variety of new possibilities for energy and biomedical applications. In particular, plasmonic photocatalysis using hybridization of semiconductor materials and metal nanoparticles has recently facilitated the rapid progress in enhancing photocatalytic efficiency under visible or solar light. One critical underlying aspect of photocatalysis is that it generates and releases reactive oxygen species (ROS) as intermediate or final products upon light excitation or activation...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29577013/effect-of-ribbon-width-on-electrical-transport-properties-of-graphene-nanoribbons
#17
Kyuhyun Bang, Sang-Soo Chee, Kangmi Kim, Myungwoo Son, Hanbyeol Jang, Byoung Hun Lee, Kwang Hyeon Baik, Jae-Min Myoung, Moon-Ho Ham
There has been growing interest in developing nanoelectronic devices based on graphene because of its superior electrical properties. In particular, patterning graphene into a nanoribbon can open a bandgap that can be tuned by changing the ribbon width, imparting semiconducting properties. In this study, we report the effect of ribbon width on electrical transport properties of graphene nanoribbons (GNRs). Monolayer graphene sheets and Si nanowires (NWs) were prepared by chemical vapor deposition and a combination of nanosphere lithography and metal-assisted electroless etching from a Si wafer, respectively...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29568722/universal-behaviour-of-high-q-fano-resonances-in-metamaterials-terahertz-to-near-infrared-regime
#18
Wen Xiang Lim, Ranjan Singh
The observation of Fano resonance phenomena is universal across several branches of physics. Photonics is one of the most important areas of physics that mainly deals with the control of light propagation and localization through its interaction with natural and artificially engineered media. In an era of miniaturization, manipulation of light at micro-nanoscales has assumed unprecedented significance due to its potential to satisfy the mankind with disruptive future technologies. In this work, we present our study on the universality of high quality factor Fano resonances in planar metamaterials across terahertz and infrared parts of the electromagnetic spectrum...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29503794/silica-sol-as-grouting-material-a-physio-chemical-analysis
#19
REVIEW
Christian Sögaard, Johan Funehag, Zareen Abbas
At present there is a pressing need to find an environmentally friendly grouting material for the construction of tunnels. Silica nanoparticles hold great potential of replacing the organic molecule based grouting materials currently used for this purpose. Chemically, silica nanoparticles are similar to natural silicates which are essential components of rocks and soil. Moreover, suspensions of silica nanoparticles of different sizes and desired reactivity are commercially available. However, the use of silica nanoparticles as grouting material is at an early stage of its technological development...
2018: Nano Convergence
https://www.readbyqxmd.com/read/29492374/surface-functionalization-dependent-subcellular-localization-of-superparamagnetic-nanoparticle-in-plasma-membrane-and-endosome
#20
Deepak B Thimiri Govinda Raj, Niamat Ali Khan
In this article, we elaborate the application of thermal decomposition based synthesis of Fe3 O4 superparamagnetic nanoparticle (SPMNP) in subcellular fractionation context. Here, we performed surface functionalization of SPMNP with phospholipids and dimercaptosuccinic acid. Surprisingly, we observed surface functionalization dependent SPMNP localization in subcellular compartments such as plasma membrane, endosomes and lysosomes. By using SPMNP based subcellular localization with pulse-chase methodology, we could use SPMNP for high pure-high yield organelle (plasma membrane, endosomes and lysosome) fractionation...
2018: Nano Convergence
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