Academic literature on the topic 'Nanodiamonds – Analysi'
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Journal articles on the topic "Nanodiamonds – Analysi"
1
Say, Jana M., Carlo Bradac, Torsten Gaebel, James R. Rabeau, and Louise J. Brown. "Processing 15-nm Nanodiamonds Containing Nitrogen-vacancy Centres for Single-molecule FRET." Australian Journal of Chemistry 65, no. 5 (2012): 496. http://dx.doi.org/10.1071/ch12103.
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Colour centres in nanodiamonds have many properties such as chemical and physical stability, biocompatibility, straightforward surface functionalisation as well as bright and stable photoluminescence, which make them attractive for biological applications. Here we examine the use of fluorescent nanodiamonds containing a single nitrogen-vacancy (NV) centre, as an alternative nano-label over conventional fluorophores. We describe a series of chemical treatments and air oxidation to reliably produce small (~15 nm) oxidised nanodiamonds suitable for applications in bioscience. We use Förster resonance energy transfer to measure the coupling efficiency from a single NV centre in a selected nanodiamond to an IRDye 800CW dye molecule absorbed onto the surface. Our single-molecule Förster resonance energy transfer analysis, based on fluorescence lifetime measurements, locates the position of the photostable NV centre deep within the core of the nanodiamond.
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Bai, Bo, Peng Peng Wang, Li Yang, and Yong Jun He. "Fabrication of Polystyrene-Encapsulated Nanodiamond via In Situ Latex Polymerization and their Wettability Evaluation." Advanced Materials Research 79-82 (August 2009): 1839–42. http://dx.doi.org/10.4028/www.scientific.net/amr.79-82.1839.
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Nanodiamonds coated with polystyrene were prepared by in-situ latex polymerization using azobisisobutylonitrile as initiator in alcohol-water solution. The products were characterized by transmission electron microscope, X-ray diffraction, thermo-gravimetric and differential thermal analysis and Fourier transformation infrared spectrum. A possible formation mechanism and the structure of products were proposed. The experimental evaluation of wettability performance showed that the hydrophobicity of nanodiamond have been enhanced with the wrapping of polystyrene films on the surface of nanodiamond particles.
3
Jiang, Xionghua, Zhenxing Chen, Joy Wolfram, and Zhizhou Yang. "Mechanistic Features of Nanodiamonds in the Lapping of Magnetic Heads." Scientific World Journal 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/326427.
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Nanodiamonds, which are the main components of slurry in the precision lapping process of magnetic heads, play an important role in surface quality. This paper studies the mechanistic features of nanodiamond embedment into a Sn plate in the lapping process. This is the first study to develop mathematical models for nanodiamond embedment. Such models can predict the optimum parameters for particle embedment. From the modeling calculations, the embedded pressure satisfiesp0=3/2·W/πa2and the indentation depth satisfiesδ=k1P/HV. Calculation results reveal that the largest embedded pressure is 731.48 GPa and the critical indentation depthδis 7 nm. Atomic force microscopy (AFM), scanning electron microscopy (SEM), and Auger electron spectroscopy (AES) were used to carry out surface quality detection and analysis of the disk head. Both the formation of black spots on the surface and the removal rate have an important correlation with the size of nanodiamonds. The results demonstrate that an improved removal rate (21 nm·min−1) can be obtained with 100 nm diamonds embedded in the plate.
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Jarre, Gerald, Steffen Heyer, Elisabeth Memmel, Thomas Meinhardt, and Anke Krueger. "Synthesis of nanodiamond derivatives carrying amino functions and quantification by a modified Kaiser test." Beilstein Journal of Organic Chemistry 10 (November 20, 2014): 2729–37. http://dx.doi.org/10.3762/bjoc.10.288.
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Nanodiamonds functionalized with different organic moieties carrying terminal amino groups have been synthesized. These include conjugates generated by Diels–Alder reactions of ortho-quinodimethanes formed in situ from pyrazine and 5,6-dihydrocyclobuta[d]pyrimidine derivatives. For the quantification of primary amino groups a modified photometric assay based on the Kaiser test has been developed and validated for different types of aminated nanodiamond. The results correspond well to values obtained by thermogravimetry. The method represents an alternative wet-chemical quantification method in cases where other techniques like elemental analysis fail due to unfavourable combustion behaviour of the analyte or other impediments.
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Perevedentseva, Elena, Nsrein Ali, Artashes Karmenyan, Ilya Skovorodkin, Renata Prunskaite-Hyyryläinen, Seppo Vainio, Chia-Liang Cheng, and Matti Kinnunen. "Optical Studies of Nanodiamond-Tissue Interaction: Skin Penetration and Localization." Materials 12, no. 22 (November 15, 2019): 3762. http://dx.doi.org/10.3390/ma12223762.
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In this work, several optical-spectroscopic methods have been used to visualize and investigate the penetration of diamond nanoparticles (NPs) of various sizes (3–150 nm), surface structures and fluorescence properties into the animal skin in vitro. Murine skin samples have been treated with nanodiamond (ND) water suspensions and studied using optical coherence tomography (OCT), confocal and two-photon fluorescence microscopy and fluorescence lifetime imaging (FLIM). An analysis of the optical properties of the used nanodiamonds (NDs) enables the selection of optimal optical methods or their combination for the study of nanodiamond–skin interaction. Among studied NDs, particles of 100 nm in nominal size were shown to be appropriate for multimodal imaging using all three methods. All the applied NDs were able to cross the skin barrier and penetrate the different layers of the epidermis to finally arrive in the hair follicle niches. The results suggest that NDs have the potential for multifunctional applications utilizing multimodal imaging.
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Chayeuski, Vadzim, Abdelhafed Taleb, Valery Zhylinski, Andrei Kuleshov, and Roman Shtempliuk. "Preparation and Characterization of the Cr-Nanodiamonds/MoN Coatings with Performant Mechanical Properties." Coatings 12, no. 7 (July 18, 2022): 1012. http://dx.doi.org/10.3390/coatings12071012.
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This paper presents the results of a study on the preparation and characterization of a Cr-DND/MoN detonation chromium-nanodiamond coating deposited on cemented tungsten carbide (WC–3 wt.% Co) mill blades using Arc-PVD and electrodeposition methods. The physical and mechanical characteristics of the coatings were investigated by scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), XRD analysis, Raman spectroscopy, micro-identification, and scratch test (evaluation of the coating adhesion). It was shown that the Cr-DND/MoN coating consists of successive layers of Cr-DND (top), Cu (middle) and MoN (bottom) with separate phases of γ-Mo2N, α-Mo, α-Cu, Cr-DND and nanodiamonds. The Cr-DND composite electrochemical coating (CEC) was deposited from the conventional chromium plating electrolyte with the addition of nanodiamonds. The copper interlayer was deposited by the Arc-PVD method on the surface of the MoN coating to improve the adhesion strength of the Cr-DND CEC. The coating showed an optimum microhardness of about 14 ± 1 GPa and good adhesion with a critical load Lc of about 93 N. In addition to the expected experimental results, the coating has high wear resistance, confirmed by scratch tests.
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Hirt, Franziska, Justus Christinck, Helmuth Hofer, Beatrice Rodiek, and Stefan Kück. "Sample fabrication and metrological characterization of single-photon emitters based on nitrogen vacancy centers in nanodiamonds." Engineering Research Express 3, no. 4 (December 1, 2021): 045038. http://dx.doi.org/10.1088/2631-8695/ac34c2.
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Abstract Quantum metrology requires a stable single-photon emission and a high single-photon purity. Since nitrogen-vacancy (NV-) centers provide both features at room temperature, they are promising candidates for the application in this field [1, 2]. The knowledge about a suitable sample preparation technique is crucial, because the quality of the single-photon emission strongly depends on the sample purity and on the spatial resolvability of the emitters. This work presents the comparison and optimization of various sample fabrication techniques of nitrogen vacancy center doped nanodiamonds on standard cover glasses. The preparation is followed by a comparative characterization of the centers of the various samples. The sample fabrication includes the removal of contaminants on the cover glass surface. This was carried out by using peroxymonosulfuric acid (piranha solution, H2SO5) in comparison to the commercially available lye Hellmanex III (by Hellma Analytics). After cleaning the cover glasses, volumes of various nanodiamond dilutions were applied via spin coating. In subsequent steps, the nanodiamonds themselves were cleaned with peroxymonosulfuric acid, too, to remove contaminants resulting from the manufacturing process, e.g. graphite. The samples were analyzed by using a confocal laser scanning microscope with an oil immersion objective. Single-photon purity was determined by measuring the second order correlation function with a Hanbury Brown and Twiss setup. Spectral analysis revealed the presence of NV−- and NV°-centers. It was shown that a suitable cleansing method has an immense impact on single-photon emission, as was proven by a comparative characterization of differently manufactured nanodiamonds.
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Bogdanov, Denis G., Vladimir A. Plotnikov, Sergey V. Makarov, Alexander S. Bogdanov, and Aleksey A. Chepurov. "DESORPTION OF IMPURITIES FROM DETONATION NANODIAMOND DURING THE SYNTHESIS OF INTERMATALLIC COMPOUNDS OF THE Ni-Al SYSTEM." IZVESTIYA VYSSHIKH UCHEBNYKH ZAVEDENII KHIMIYA KHIMICHESKAYA TEKHNOLOGIYA 62, no. 12 (December 7, 2019): 25–32. http://dx.doi.org/10.6060/ivkkt.20196212.6021.
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The results of modification of the impurity subsystem of detonation nanodiamonds (DND) (from the “Altai” Federal Research and Production Center (Biysk)) with active metals and mixtures of nickel and aluminum metals are presented. Samples made from three different metal-diamond mixtures were investigated: 1) 70 wt % of DND and 30 wt % of Al, 2) 50 wt % of DND and 50 wt % of mixture of nickel and aluminum in NiAl stoichiometry, 3) 70 wt % of DND and 30 wt % of mixture of nickel and aluminum in Ni3Al stoichiometry. The heating of samples of nanodiamonds in a vacuum volume (VUP-5) is accompanied by thermal desorption of volatile compounds. Analysis of the samples using differential scanning calorimetry and mass-spectrometry (DSC - on STA 409 PC Luxx NETZSCH, MS - on QMS 403 D Aeolos NETZSCH) allowed us to study the kinetics of desorption and the molecular composition of volatile compounds desorbed by heating nanodiamonds. Annealing of the charge with aluminum is accompanied by a nonmonotonic change in the weight of the sample during heating. Heating mixtures of nanodiamond with nickel and aluminum is accompanied by an almost monotonic decrease in weight. Weight loss at up to 950 °C annealing can reach 20%. When samples are heated to 950 °C, H2O (up to 200 °С), O2 (up to 60 °С), H2S (up to 700 °С), CO2 (up to 600 °С), SO2 (up to 450 °С), N2 (up to 60 °С) evaporate from the surface of the samples. Endo- and exo-effects indicate the occurrence of chemical reactions between impurities and metals. The cleaning process most actively takes place during the annealing of the metal-diamond mixture containing Ni and Al in Ni3Al stoichiometry.
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Manoj, B., Ashlin M. Raj, and George Thomas Chirayil. "Facile synthesis of preformed mixed nano-carbon structure from low rank coal." Materials Science-Poland 36, no. 1 (May 18, 2018): 14–20. http://dx.doi.org/10.1515/msp-2018-0026.
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Abstract Coal is a natural energy resource which is mainly used for energy production via combustion. Coal has nanocrystals embedded in it, formed during the coalification process, and is an ideal precursor for nano-carbon dots and diamonds. Herein, we report a facile top-down method to synthesise nanodots and diamonds of the size of 5 nm to 10 nm from three different types of coal by simple chemical leaching. TEM analysis revealed the formation of a mixture of carbon dots, graphene layers, and quantum dots in bituminous coal and sub-bituminous coal. Raman analysis confirmed the existence of synthesized nanodiamond and nano-carbon mixed phase with defects associated with it. It is concluded that graphene quantum dots, nanodiamonds, graphene sheets and carbon dots present in coal can be extracted by simple chemical treatment. These structures can be tuned to photoluminescent material for various optoelectronic applications or energy harvesting devices like super capacitors.
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Wu, Yingke, Shuqin Cao, Md Noor A. Alam, Marco Raabe, Sandra Michel-Souzy, Zuyuan Wang, Manfred Wagner, Anna Ermakova, Jeroen J. L. M. Cornelissen, and Tanja Weil. "Fluorescent nanodiamonds encapsulated by Cowpea Chlorotic Mottle Virus (CCMV) proteins for intracellular 3D-trajectory analysis." Journal of Materials Chemistry B 9, no. 28 (2021): 5621–27. http://dx.doi.org/10.1039/d1tb00890k.
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Fluorescent nanodiamonds are stabilized by a corona of virus capsid proteins. Intracellular diffusion studies were performed suggesting that virus-coated nanodiamonds could be attractive tools for conceptual understanding of cell-virus interactions.
Dissertations / Theses on the topic "Nanodiamonds – Analysi"
1
Casanovas, Presti Charlène. "Modification de surface de nanodiamants par des groupements phosphorés." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20075.
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Les nanodiamants font l'objet d'un intérêt croissant dans différents domaines tels que la physique (grâce aux propriétés photo-physiques dues aux défauts azotés dans la maille cristalline), la chimie des matériaux (synthèse de nouveaux matériaux composites avec des performances mécaniques accrues), la tribologie (lubrification, polissage) et la biologie (comme agents de contraste ou vecteurs de molécules actives, …). Le développement de nouveaux matériaux fonctionnels à base de nanodiamants nécessite de poursuivre des études fondamentales sur la fonctionnalisation et la caractérisation de leur surface. Plusieurs méthodes de fonctionnalisation de surface ont déjà été proposées, mais beaucoup de possibilités n'ont pas encore été explorées.L'objectif de ce projet de recherche est de mettre au point de nouvelles voies de modification de surface de nanodiamants et de développer des techniques de caractérisation de ces matériaux. Les nanodiamants que nous étudions sont commerciaux. Ils sont obtenus par détonation puis purifiés et comportent des fonctions oxygénées en surface (alcool, acide carboxylique, cétone, etc). Nous proposons de fonctionnaliser la surface de ces nanodiamants en faisant réagir les fonctions alcool de surface avec des chlorures d'acides phosphorique ou phosphonique. Une première partie des résultats concerne le greffage par le trichlorure de phosphoryle (POCl3) conduisant à la fonctionnalisation par des espèces phosphates. La seconde partie présente le greffage de chlorure d'acides phosphoniques (RPOCl2) permettant le greffage de phosphonates.Les nanodiamants modifiés sont étudiés par différentes techniques de caractérisation, notamment par spectroscopie infrarouge (FTIR), analyse thermogravimétrique (ATG), résonance magnétique nucléaire (RMN) en phase solide du 31P, 13C et 1H, analyses élémentaires, diffraction des rayons X (DRX) et microscopie électronique à transmission (MET).Enfin, en collaboration avec l'Ecole des Mines d'Alès, nous avons débuté l'étude de composites polymère/nanodiamants, et les premiers résultats sont présentés dans une troisième partieNanodiamonds are increasingly studied in different fields such as physics (through spontaneous photoluminescence properties due to nitrogen-vacancy centers), tribology (lubrication, polishing), materials science (nanocomposites) or biology (drug or gene delivery, bio-labeling). The development of nanodiamonds-based materials with new properties requires continuing further fundamentals studies on the functionalization and characterization of their surface. Several methods of surface functionalization have already been proposed but many possibilities have not yet been explored.The objective of this research project is to develop new ways of surface modification of nanodiamonds and develop techniques for the characterization of these materials. The nanodiamonds studied here are commercial. They are obtained by detonation then purified and their surface is covered by oxygenated functions (alcohol, carboxylic acid, ketone, aldehyde, etc.). We propose to functionalize the surface of these nanodiamonds by reacting the alcohol surface functions with phosphoric or phosphonic acid chlorides. The first part of the results concerns the grafting by phosphoryl trichloride (POCl3) leading to the functionalization by phosphate species. The second part presents the grafting of phosphonic acid chlorides (RPOCl2) leading to phosphonate surface species.Surface modifications are monitored by several characterization methods such as infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), nuclear magnetic resonance spectroscopy (1H, 13C and 31P solid-state NMR), elemental analysis, X-ray diffraction (XRD) and transmission electronic microscopy (TEM).In addition, in collaboration with the Ecole des Mines d'Alès, we started the study of polymer/nanodiamonds composites, and the first results are presented in a third part
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Gür, Fatih Nadi. "Plasmonic waveguides self-assembled on DNA origami templates: from synthesis to near-field characterizations." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-235762.
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Manipulating light by controlling surface plasmons on metals is being discussed as a means for bridging the size gap between micrometer-sized photonic circuits and nanometer-sized integrated electronics. Plasmonic waveguides based on metal nanoparticles are of particular interest for circumventing the diffraction limit, thereby enabling high-speed communication over short-range distances in miniaturized micro-components. However, scalable, inexpensive fine-tuning of particle assemblies remains a challenge and near-field probing is required to reveal plasmonic interactions. In this thesis, self-assembled waveguides should be produced on DNA scaffolds. DNA origami is an extremely versatile and robust self-assembly method which allows scalable production of nanostructures with a fine control of assemblies at the nanoscale. To form the plasmonic waveguides, six-helix bundle DNA origami nanotubes are used as templates for attachment of highly monodisperse and monocrystalline gold nanoparticles with an inter-particle distance of 1-2 nm. In the first part of this thesis, the effects of parameters which are involved in assembly reactions are systematically investigated. The assembly yield and binding occupancy of the gold nanoparticles are determined by an automated, high-throughput image analysis of electron micrographs of the formed complexes. As a result, unprecedented binding site occupancy and assembly yield are achieved with the optimized synthesis protocol. In addition, waveguides with different sizes of gold nanoparticles and different inter-particle distances, quantum dots attachments to the waveguides and multimerization of the waveguides are successfully realized. In the second part of this thesis, direct observation of energy transport through a self-assembled waveguide towards a fluorescent nanodiamond is demonstrated. High-resolution, near-field mapping of the waveguides are studied by electron energy loss spectroscopy and cathodoluminescence imaging spectroscopy. The experimental and simulation results reveal that energy propagation through the waveguides is enabled by coupled surface plasmon modes. These surface plasmon modes are probed at high spatial and spectral resolutions. The scalable self-assembly approach presented here will enable the construction of complex, sub diffraction plasmonic devices for applications in high-speed optical data transmission, quantum information technology, and sensingDie Manipulation des Lichts durch die Kontrolle von Oberflächenplasmonen auf metallischen Oberflächen und Nanopartikeln gilt als vielversprechende Methode zur Überbrückung der Größen-Lücke zwischen Mikrometer-großen photonischen und nanometer-großen elektronischen Schaltkreisen. Plasmonische Wellenleiter basierend auf metallischen Nanopartikeln sind vom besonderen Interesse, da sie die Umgehung des Beugungslimits und somit eine Hochgeschwindigkeitskommunikation über kurze Distanzen in immer kleiner werdenden Schaltkreisen ermöglichen könnten. Allerdings ist die skalierbare und kostengünstige Anordnung von Partikeln eine große Herausforderung und es werden Nahfelduntersuchungen benötigt um plasmonische Interaktionen detektieren zu können. Das Ziel dieser Arbeit ist die Selbstassemblierung von multi-partikel Wellenleitern auf DNA Gerüsten. Die Verwendung von DNA-Origami bietet eine äußerst vielseitige Plattform zur skalierbaren Herstellung von Nanostrukturen mittels Selbstassemblierung und ermöglicht eine präzise Kontrolle der Anordnungen im Nanobereich. Für den Aufbau der plasmonischen Wellenleiter werden DNA-Origami Nanoröhren, bestehend aus sechs Helices als Templat für die Anbindung von monodispersen und monokristallinen Goldnanopartikeln mit einem interpartikulären Abstand von 1-2 nm verwendet. Im ersten Abschnitt dieser Arbeit werden die beeinflussenden Faktoren dieser Assemblierungsreaktion systematisch untersucht. Die Ausbeute der assemblierten Strukturen und die Besetzung der Bindungsstellen werden durch eine automatisierte und effiziente Bildanalyse von Elektronenmikroskopieaufnahmen ausgewertet. Durch die Entwicklung eines optimierten Syntheseprotokolls werden bisher unerreichte Assemblierungsausbeuten ermöglicht. Zusätzlich erfolgen die experimentelle Realisierung von Strukturen mit verschieden großen Goldnanopartikeln und unterschiedlichen interpartikulären Abständen, sowie die Anbindung von Quantenpunkten an die Wellenleiter und eine Verknüpfung der assemblierten Strukturen. Der zweite Abschnitt dieser Dissertation befasst sich mit der Untersuchung des Energietransports in selbstassemblierten Wellenleitern über einen fluoreszierenden Nanodiamanten. Dazu erfolgen hochaufgelöste Nahfeldmessungen der Wellenleiter mittels Elektronenenergieverlustspektroskopie und Kathodolumineszenz-mikroskopie. Die experimentellen Ergebnisse und zusätzlich durchgeführte Simulationen bestätigen eine durch gekoppelte Oberflächenplasmonenmoden induzierte Weitergabe der Energie innerhalb des Wellenleiters. Diese Oberflächenplasmonenmoden werden bei hoher räumlicher und spektraler Auflösung untersucht. Das hier umgesetzte Konzept der Selbstassemblierung wird den Aufbau komplexer plasmonischer Geräte für Anwendungen im Bereich der optischen Hochgeschwindigkeitsdatenübertragung, der Quanteninformations-technolgie und der Sensorik ermöglichen
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Chang, Wei-Hung, and 張暐宏. "Fabrication and Charatisitics Analysis of Nanodiamond/Amorphous Carbon Composite Film." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/36833178519477170279.
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碩士龍華科技大學
工程技術研究所
99
Nano-crystalline diamond film with diamond grains in the nanometer scale, possesses meritorious properties such as smooth surface and a higher transparency. Furthermore, since they have inherent characters of diamond films, such as high hardness, higher mechanical strength, chemically inert and lower friction characteristic. The superior performance of the nano-crystalline diamond film can use in various industrial fields, such as electronics, tribological and biomedical applications. In this study, we used the microwave plasma chemical vapor deposition system, in the mixed gas H2/CH4/Ar-rich change the hydrogen content 0% ~ 25% in operating pressure 100 Torr. Under power 800 W discusses the hydrogen content differently influence and to its characteristic analysis regarding the nanometer diamond thin film (NCD).
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Hung, Wan-Yu, and 洪椀愉. "Nanodiamond/TiO2 core/shell nanocomposite as a promising material for analysis of phosphopeptides." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/61934689401668252044.
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碩士臺灣大學
化學研究所
98
Protein phosphorylation is an important post-translational control of protein activity in cells. However, low abundances, low stoichiometry, and poor ionization of phosphopeptides make the isolation and concentration steps indispensable prior to MS analysis. In this study, we utilized a new probe of high affinity for phosphopeptide enrichment with titanium dioxide-coated nanodiamonds (TiO2-coated NDs). Nanodiamond (ND) holds several unique properties such as small particle size, large specific surface area, wide optical transparency range, and facile surface functionalizability, making it a promising solid-phase substrate for affinity purification mass spectrometry. The enrichment conditions were optimized using tryptic digests of β-casein, and the high specificity of the TiO2-coateed NDs was demonstrated by selectively enriching phosphopeptides from the tryptic digests of protein mixture of β-casein and bovine serum albumin (BSA) with a molar ratio of 1: 5000, followed by MALDI-TOF MS characterization. The new protocol was also coupled with nano-LC-MS/MS system without difficulty. Analysis of tryptic digests from cytoplasmic fraction of HeLa cells yielded numbers of phosphopeptide identifications comparable to that obtained using commercial phosphopeptide isolation tool (Phos-trapTM 96 Enrichment Kit) and almost 59.3% recovery of phosphopeptides, presumable due to the presence of a large numbers of sites available on TiO2-coated NDs for binding or incomplete removal of nonspecific bound peptides. In 120 μg of equivalent of HeLa cell lysates, we identified 696 unique phosphopeptides and 925 phosphorylation sites, indicating the excellent performance of the TiO2-coated NDs.
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Haung, Meng-Chang, and 黃孟璋. "Global Analysis of Phosphoprotein by Nanodiamond Based Two-step Affinity Purification and Mass Spectrometry." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/83182538171328343066.
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碩士國立暨南國際大學
應用化學系
100
Simultaneous detection of multiply and singly phosphorylated peptides using mass spectrometer is challenging because of suppression effect during ionization. To overcome this obstacle, this study presents a new approach to fractionate the multiply and singly phosphorylated peptides prior to MS analysis by nanodiamond-based two-step affinity purification using polyarginine-coated nanodiamonds (PA-coated NDs) and titanium dioxide-coated nanodiamonds (TiO2-coated NDs). The feasibility of this approach was demonstrated using tryptic digests of β-casein, complex protein mixture, and non-fat milk. The high specificity of the approach is shown in its effective enrichment and fractionation of phosphopeptides from the digest of β-casein and bovine serum albumin (BSA) at a molar ratio as low as 1: 1000. The total number of identified phosphopeptides and phosphorylation sites obtained with ND-based two-step enrichment was significantly larger than that obtained with TiO2 enrichment for MS analysis of milk digest by MALDI MS and ESI-MS/MS. Finally, we applied this approach to study the phosphorylation sites of immunoprecipitated protein kinase B (AKT) by LC-ESI-MS/MS. The ND-based two-step enrichment offers a simple and effective alternative for fractionation of multiply and singly phosphorylated peptides prior to phosphoprotein analysis by MALDI MS and ESI-MS/MS, and allows for more comprehensive phosphoproteome analysis from limited starting materials.
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Hsieh, Feng-Jen, and 謝豐任. "Selective Enrichment of Multiply Phosphorylated Peptides Using Polyarginine-coated Nanodiamonds Prior to Liquid Chromatography Mass Spectrometric Analysis." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/08610896987120268256.
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碩士國立臺灣大學
化學研究所
98
Identification of multi-phosphorylated peptides by liquid chromatography-tandem mass spectrometry（LC-MS/MS）remains a challenging task due to the poor ionization of the species. For this reason, various kits to selectively enrich phosphopeptides prior to MS analysis have been developed and commercialized, but most of them are selective only for singly phosphorylated peptides. Interestingly, poly-arginine-coated nanodiamond（PA-ND）shows a high selectivity for multi-phosphorylated peptides and this has been demonstrated by Chang et al. For further applications in real sample analysis with LC-MS/MS, an effective elution buffer to separate the target molecules from the PA-ND substrate has yet to be found. In this work, we have successfully synthesized a much highly selective probe by coating PA on ND（average diameter: 86.9 nm → 140.6 nm）in 0.1 M MES buffer. The zeta potential in deionized water increased from -27.6 mV to +43.29 mV, better than the previous one, ~0 mV. Furthermore, we found a better enrichment condition, with 40 % acetonitrile containing 1 % trifluoroacetic acid, that allows us to selectively probe multi-phosphorylated peptides in very complex samples（with impurities ≥5000 higher than of the target analyte）. Finally, we also found that 12.5 % ammonium water containing 0.5 M potassium phosphate can easily elute the enriched substance from the probe. LC-MS/MS can therefore successfully identify a triply phosphorylated peptide extracted from a highly mixture by the newly synthesized PA-ND particles and with the newly developed protocols.
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Gür, Fatih Nadi. "Plasmonic waveguides self-assembled on DNA origami templates: from synthesis to near-field characterizations." Doctoral thesis, 2017. https://tud.qucosa.de/id/qucosa%3A31000.
Full textAbstract:
Manipulating light by controlling surface plasmons on metals is being discussed as a means for bridging the size gap between micrometer-sized photonic circuits and nanometer-sized integrated electronics. Plasmonic waveguides based on metal nanoparticles are of particular interest for circumventing the diffraction limit, thereby enabling high-speed communication over short-range distances in miniaturized micro-components. However, scalable, inexpensive fine-tuning of particle assemblies remains a challenge and near-field probing is required to reveal plasmonic interactions. In this thesis, self-assembled waveguides should be produced on DNA scaffolds. DNA origami is an extremely versatile and robust self-assembly method which allows scalable production of nanostructures with a fine control of assemblies at the nanoscale. To form the plasmonic waveguides, six-helix bundle DNA origami nanotubes are used as templates for attachment of highly monodisperse and monocrystalline gold nanoparticles with an inter-particle distance of 1-2 nm. In the first part of this thesis, the effects of parameters which are involved in assembly reactions are systematically investigated. The assembly yield and binding occupancy of the gold nanoparticles are determined by an automated, high-throughput image analysis of electron micrographs of the formed complexes. As a result, unprecedented binding site occupancy and assembly yield are achieved with the optimized synthesis protocol. In addition, waveguides with different sizes of gold nanoparticles and different inter-particle distances, quantum dots attachments to the waveguides and multimerization of the waveguides are successfully realized. In the second part of this thesis, direct observation of energy transport through a self-assembled waveguide towards a fluorescent nanodiamond is demonstrated. High-resolution, near-field mapping of the waveguides are studied by electron energy loss spectroscopy and cathodoluminescence imaging spectroscopy. The experimental and simulation results reveal that energy propagation through the waveguides is enabled by coupled surface plasmon modes. These surface plasmon modes are probed at high spatial and spectral resolutions. The scalable self-assembly approach presented here will enable the construction of complex, sub diffraction plasmonic devices for applications in high-speed optical data transmission, quantum information technology, and sensing.Die Manipulation des Lichts durch die Kontrolle von Oberflächenplasmonen auf metallischen Oberflächen und Nanopartikeln gilt als vielversprechende Methode zur Überbrückung der Größen-Lücke zwischen Mikrometer-großen photonischen und nanometer-großen elektronischen Schaltkreisen. Plasmonische Wellenleiter basierend auf metallischen Nanopartikeln sind vom besonderen Interesse, da sie die Umgehung des Beugungslimits und somit eine Hochgeschwindigkeitskommunikation über kurze Distanzen in immer kleiner werdenden Schaltkreisen ermöglichen könnten. Allerdings ist die skalierbare und kostengünstige Anordnung von Partikeln eine große Herausforderung und es werden Nahfelduntersuchungen benötigt um plasmonische Interaktionen detektieren zu können. Das Ziel dieser Arbeit ist die Selbstassemblierung von multi-partikel Wellenleitern auf DNA Gerüsten. Die Verwendung von DNA-Origami bietet eine äußerst vielseitige Plattform zur skalierbaren Herstellung von Nanostrukturen mittels Selbstassemblierung und ermöglicht eine präzise Kontrolle der Anordnungen im Nanobereich. Für den Aufbau der plasmonischen Wellenleiter werden DNA-Origami Nanoröhren, bestehend aus sechs Helices als Templat für die Anbindung von monodispersen und monokristallinen Goldnanopartikeln mit einem interpartikulären Abstand von 1-2 nm verwendet. Im ersten Abschnitt dieser Arbeit werden die beeinflussenden Faktoren dieser Assemblierungsreaktion systematisch untersucht. Die Ausbeute der assemblierten Strukturen und die Besetzung der Bindungsstellen werden durch eine automatisierte und effiziente Bildanalyse von Elektronenmikroskopieaufnahmen ausgewertet. Durch die Entwicklung eines optimierten Syntheseprotokolls werden bisher unerreichte Assemblierungsausbeuten ermöglicht. Zusätzlich erfolgen die experimentelle Realisierung von Strukturen mit verschieden großen Goldnanopartikeln und unterschiedlichen interpartikulären Abständen, sowie die Anbindung von Quantenpunkten an die Wellenleiter und eine Verknüpfung der assemblierten Strukturen. Der zweite Abschnitt dieser Dissertation befasst sich mit der Untersuchung des Energietransports in selbstassemblierten Wellenleitern über einen fluoreszierenden Nanodiamanten. Dazu erfolgen hochaufgelöste Nahfeldmessungen der Wellenleiter mittels Elektronenenergieverlustspektroskopie und Kathodolumineszenz-mikroskopie. Die experimentellen Ergebnisse und zusätzlich durchgeführte Simulationen bestätigen eine durch gekoppelte Oberflächenplasmonenmoden induzierte Weitergabe der Energie innerhalb des Wellenleiters. Diese Oberflächenplasmonenmoden werden bei hoher räumlicher und spektraler Auflösung untersucht. Das hier umgesetzte Konzept der Selbstassemblierung wird den Aufbau komplexer plasmonischer Geräte für Anwendungen im Bereich der optischen Hochgeschwindigkeitsdatenübertragung, der Quanteninformations-technolgie und der Sensorik ermöglichen.
Books on the topic "Nanodiamonds – Analysi"
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M, Gruen Dieter, Shenderova Olga A, and Vul' Alexander, eds. Synthesis, properties, and applications of ultrananocrystalline diamond. Dordrecht: Springer, 2005.
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Arnault, Jean-Charles. Nanodiamonds: Advanced Material Analysis, Properties and Applications. Elsevier Science & Technology Books, 2017.
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Arnault, Jean-Charles. Nanodiamonds: Advanced Material Analysis, Properties and Applications. Elsevier Science & Technology Books, 2017.
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(Editor), Olga A. Shenderova, and Dieter M. Gruen (Editor), eds. Ultrananocrystalline Diamond: Synthesis, Properties, and Applications. William Andrew Publishing, 2006.
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Gruen, Dieter M., and Olga A. Shenderova. Ultrananocrystalline Diamond: Synthesis, Properties, and Applications. Elsevier Science & Technology Books, 2006.
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Gruen, Dieter M., and Olga A. Shenderova. Ultrananocrystalline Diamond: Synthesis, Properties and Applications. Elsevier Science & Technology Books, 2012.
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Ultananocrystalline Diamond. William Andrew Publishing, 2012.
Find full textBook chapters on the topic "Nanodiamonds – Analysi"
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Niranjana, S., B. S. Satyanarayana, U. C. Niranjan, and Shounak De. "Quantitative and Indirect Qualitative Analysis Approach for Nanodiamond Using SEM Images and Raman Response." In IFMBE Proceedings, 782–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-92841-6_192.
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Nesterenko, Pavel N., Dimitar Mitev, and Brett Paull. "Elemental analysis of nanodiamonds by inductively coupled plasma hyphenated methods." In Nanodiamonds, 109–30. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-32-343029-6.00005-2.
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"Economic Analysis of Market Opportunities for CNTs and Nanodiamond." In Carbon-based Nanomaterials and Hybrids, 185–214. Jenny Stanford Publishing, 2016. http://dx.doi.org/10.1201/b15673-11.
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Werner, Matthias, Mario Markanovic, Catharina-Sophie Ciesla, and Leif Brand. "Economic Analysis of Market Opportunities for CNTs and Nanodiamond." In Carbon-based Nanomaterials and Hybrids, 171–99. Pan Stanford Publishing, 2014. http://dx.doi.org/10.1201/b15673-9.
Full textConference papers on the topic "Nanodiamonds – Analysi"
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Sivanand, R., Vasu Gajendiran, Hassan Abbas Alshamsi, R. Raffik, Anmol Sharma, and Kumud Pant. "Carbon Based Nanomaterials Technology for Tribology Applications - A Review." In International Conference on Recent Advancements in Biomedical Engineering. Switzerland: Trans Tech Publications Ltd, 2022. http://dx.doi.org/10.4028/p-s2ba29.
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Carbon nanomaterials have piqued the interest of researchers over the last two decades due to their proven wear and friction properties, in addition to tribological application. This review provides a detailed analysis of the latest discoveries in tribology of four common carbon nanoparticles are carbon nanotubes (CNTs), graphene, nanodiamonds and fullerene. First, the four forms of carbon nanomaterials are described in terms of their applicability in coating for friction and anti-wears. Second, the use of graphene and CNTs as additions to improve tribological behaviours in bulk materials is discussed. Finally, the mechanisms of CNTs, fullerene, fullerene, nanodiamond and graphene, working as additive to lubricate to reduce wear and friction are discussed. Fourth, the advancements in super-lubricity employing carbon nanotubes and graphene are emphasised. Finally, this study finishes with a look ahead at future research on carbon nanoparticles in tribology, their major barriers for practical use, and prospective remedies.
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Liu, Wing Kam, and Ashfaq Adnan. "Multiscale Modeling and Simulation for Nanodiamond-Based Therapeutic Delivery." In ASME 2010 First Global Congress on NanoEngineering for Medicine and Biology. ASMEDC, 2010. http://dx.doi.org/10.1115/nemb2010-13273.
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It has been demonstrated from recent research that nanodiamond(ND)-enabled drug delivery as cancer therapeutics represents an important component of optimized device functionality. The goal of the current research is to develop a multiscale modeling technique to understand the fundamental mechanism of a ND-based cancer therapeutic drug delivery system. The major components of the proposed device include nanodiamonds (ND), parylene buffer layer and doxorubicin (DOX) drugs, where DOX loaded self-assembled nanodiamonds are packed inside parylene capsule. The efficient functioning of the device is characterized by its ability to precisely detect targets (cancer cells) and then to release drugs at a controlled manner. The fundamental science issues concerning the development of the ND-based device includes (a) a precise identification of the equilibrium structure, surface electrostatics and self assembled morphology of nanodiamonds, (b) understanding of the drug/biomarker adsorption and desorption process to and from NDs, (c) rate of drug release through the parylene buffers, and finally, (d) device performance under physiological condition. In this study, we aim to systematically address these issues using a multscale computational framework. Specifically, the structure and electrostatics of the functionalized NDs are predicted by quantum scale calculation (Density Functional Tight Binding). The DFTB) study on smaller NDs suggests a facet dependent charge distributions on ND surfaces. Using the charges for smaller NDs (∼ valid for 1–3.3 nm dia ND), we then determined surface charges for larger (4–10 nm) truncated octahedral nanodiamonds (TOND). We found that the [100] face and the [111] face contain positively and negatively charged atoms, respectively. Employing this surface electrostatics of nanodiamonds, atomistic-scale simulations are performed to simulate the self-assembly process of the NDs and drug molecules in a solution as well as to evaluate nanoscale diffusion coefficient of DOX molecules. In order to quantify the nature of the aggregate morphology, a fractal analysis has been performed. The mass fractal dimensions for a variety of aggregate size have been obtained from molecular simulations assuming ‘diffusion-limited aggregation (DLA)’ process. Then, by considering the experimentally observed aggregate dimensions, by using DLA based fractal analysis and by utilizing Lagvankar-Gemmell Model for aggregate density, a continuum model for larger aggregates will be developed to characterize aggregate strengths and break-up mechanism, which in turn will help us to understand how aggregate size can be reduced. In this talk, an outline for this continuum model will be discussed. In addition, we have been performing molecular simulations on DOX-ND where multiple drug molecules are allowed to interact with a cluster of self-assembled nanodiamonds in pH controlled solution. The purpose of this study is to find the effect of solution pH on the loading and release of drug to and from nanodiamonds. Our initial results show that a higher pH is necessary to ensure drug release from nanodiamonds. Once we completely understand the essential physics of pH controlled drug loading and release, we plan to develop multiscale models of tumor nodules to represent them as a collection of individual tumor cells. Each cell will be then modeled as a deformable body comprised of three homogenous materials: cortex membrane, cytosol and nucleus. The cortex membrane and the cytosol will serve as a weak permeable medium where the absorption coefficients of the doxorubicin remain constant and obey Fick’s law. In this study, it will be assumed that drug release from the microdevice to its outer periphery will be governed by Fickian Diffusion. It will also be assumed that the complex flow of drug through the interstitial fluid of the body will be dictated by Darcy’s law. It will be assumed that the solute drug transport in these regions will be due to a combination of convection, diffusion, elimination in the intra- and extra-cellular space, receptive cell internalization and degradation. Results from this study will provide fundamental insight on the definitive targeting of infected cells and high resolution controlling of drug molecules.
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Adnan, Ashfaq, and Wing Kam Liu. "Electrostatic Self-Assembly of Functionalized Nanodiamonds and Their Binding Capacity With Doxorubicin Drugs." In ASME 2010 First Global Congress on NanoEngineering for Medicine and Biology. ASMEDC, 2010. http://dx.doi.org/10.1115/nemb2010-13164.
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While cancers have no known cure, some of them can be successfully treated with the combination of surgery and systematic therapy. In general, systemic/widespread chemotherapy is usually injected into the bloodstream to attempt to target cancer cells. Such procedure often imparts devastating side effects because cancer drugs are nonspecific in activity, and transporting them throughout the bloodstream further reduces their ability to target the right region. This means that they kill both healthy and unhealthy cells. It has been observed that the physiological conditions of the fluids around living cells can be characterized by pH, and the magnitude of pH around a living cell is different from cancerous cells. Moreover, a multiscale anatomy of carcinoma will reveal that the microstructure of cancer cells contains some characteristic elements such as specific biomarker receptors and DNA molecules that exclusively differentiate them from healthy cells. If these cancer specific ligands can be intercalated by some functional molecules supplied from an implantable patch, then the patch can be envisioned to serve as a complementary technology with current systemic therapy to enhance localized treatment efficiency, minimize excess injections/surgeries, and prevent tumor recurrence. The broader objective of our current research is to capture some fundamental insights of such drug delivery patch system. It is envisioned that the essential components of the device is nanodiamonds (ND), parylene buffer layer and doxorubicin (DOX) drugs. In its simplest form, self-assembled nanodiamonds - functionalized or pristine, and DOX molecules are contained inside parylene capsule. The efficient functioning of the device is characterized by its ability to precisely detect targets (cancer cells) and then to release drugs at a controlled manner. The fundamental science issues concerning the development of the ND-based device include: 1. A precise identification of the equilibrium structure and self assembled morphology of nanodiamonds, 2. Fundamental understanding of the drug adsorption and desorption process to and from NDs, and 3. The rate of drug release through the parylene buffers. The structure of the nanodiamond (ND) is crucial to the adsorption and desorption of drug molecules because it not only changes the self-assembly configuration but also alters the surface electrostatics. To date, the structure and electrostatics of NDs are not yet well understood. A density functional tight binding theory (DFTB) study on smaller [2] NDs suggests a facet dependent charge distributions on ND surfaces. These charges are estimated by Mulliken Analysis [1]. Using the charges for smaller NDs (∼valid for 1–3.3 nm dia ND) we first projected surface charges for larger (4–10 nm) truncated octahedral nanodiamonds (TOND), and it has been found that the [100] face and the [111] face contain positively and negatively charged atoms, respectively. These projected charges are then utilized to obtain the self assembled structure of pristine TONDs from Molecular Dynamics (MD) simulations [4] as shown in Fig. 1. The opposite charges on the [100] and [111] face invoked electrostatic attractions among the initially isolated NDs and a network of nanodiamond agglutinates are formed as evidenced in Fig. 1(b). This study confirms why as manufactured NDs are found in agglomerated form. The study also suggests that a large fraction of ND surfaces become unavailable for drug absorption as many of the [100] faces are coherently connected to [111] faces. As a result, it can be perceived that effective area for drug adsorption on ND surfaces will be less compared to theoretical prediction which suggests that a 4nm TOND may contain as high 360 drug molecules on its surface [5]. It has been observed that as manufactured NDs may contain a variety of functional groups, and currently, we are studying the mechanism of self-assembly for functionalized nanodiamonds so that we understand the role of functional groups. The next phase of calculation involves binding of the DOX to the NDs. Essentially, the understanding of drug absorption and desorption profile at a controlled rate to and from NDs is the most critical part of the device design. Some recent quantum calculation suggests that part of NDs and drug molecules contain opposite charges at their surfaces; it has been a natural interpretation that interactions between ND and drug molecules should be straight-forward — NDs should attract to drugs as soon as they come closure. Recent experiments [6], however, suggest that NDs usually do not interact with drug molecules in the presence of neutral solutions. Addition of NaCl in the solution improves the interaction dramatically. In the first part of the study, we [3–5] have studied the interaction of single DOX molecules with TOND surfaces via MD simulation. As shown in Fig. 2, this study suggests that DOX molecules first arrange them around the preferential sites on nanodiamonds (e.g. around the [111] face) and then spontaneously attach on the surface. It is also observed that only DOX molecule is attached per facets of TONDs. It can be noted that each TOND has 6 [100] face and 8 [111] faces. Figure 3 shows the energy minimization process during the DOX-ND interaction. It can be noted that these simulations have been performed in vacuum environment. In order to see how DOX interacts in solution media, another set of simulations have been conducted where “vacuum” environment have been replaced with solution media of different pH. Moreover, functionalization on the ND surfaces will create a different environment for the DOX molecules. Research is underway to capture the fundamental physics on the DOX loading and release to and from functionalized nanodiamonds. Once we understand the essential physics of drug loading and unloading, in the future we plan to model diffusion controlled drug release through ND coated film device by incorporating the multiscale science learned from the current study. Results from this study will provide fundamental insight on the definitive targeting of infected cells and high resolution controlling of drug molecules.
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Vervald, Alexey M., Ekaterina N. Vervald, Svetlana Patsaeva, and Tatiana Dolenko. "Fluorescence quenching of bioactive molecules by nanodiamonds." In Saratov Fall Meeting 2018: Computations and Data Analysis: from Nanoscale Tools to Brain Functions, edited by Dmitry E. Postnov. SPIE, 2019. http://dx.doi.org/10.1117/12.2523329.
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Arenal, Raul. "Monochromated EELS Analyses on N-doped NanoDiamonds." In European Microscopy Congress 2020. Royal Microscopical Society, 2021. http://dx.doi.org/10.22443/rms.emc2020.1160.
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Laptinskiy, Kirill A., Helena Kettiger, Olga Shenderova, Sergey A. Burikov, Jessica M. Rosenholm, and Tatiana A. Dolenko. "Nanodiamond based complexes for prolonged dexamethasone release." In Saratov Fall Meeting 2018: Computations and Data Analysis: from Nanoscale Tools to Brain Functions, edited by Dmitry E. Postnov. SPIE, 2019. http://dx.doi.org/10.1117/12.2523336.
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Zhang, Qingwei, Yury Gogotsi, Peter I. Lelkes, and Jack G. Zhou. "Nanodiamond Reinforced PLLA Nanocomposites for Bone Tissue Engineering." In ASME 2012 International Manufacturing Science and Engineering Conference collocated with the 40th North American Manufacturing Research Conference and in participation with the International Conference on Tribology Materials and Processing. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/msec2012-7393.
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Nanodiamond (ND) is an attractive nanomaterial for reinforcement of biopolymers due to the ND’s superior mechanical and chemical properties, and low biotoxicity. A novel composite material has been produced for bone scaffolds utilizing the biodegradable polymer poly(L-lactic acid) (PLLA) and octadecylamine-functionalized nanodiamond (ND-ODA). Composites were prepared by admixing to a PLLA/chloroform solution chloroform suspension of ND-ODA in concentration range of 0–10% (w/w). The dispersion of ND-ODA evaluated by transmission electron microscopy (TEM) shows uniform distribution of ND-ODA in PLLA matrix. The composites were characterized by differential scanning calorimetry (DSC). DSC analysis of the composites showed no significant thermal behavior changes with the addition of ND-ODA into the polymer. Biomineralization test shows that ND-ODA can enhance the mineral deposition on scaffolds. Improved mechanical properties and good biocompatibility with enhanced biomineralization combined suggest that ND-ODA/PLLA might have potential applications for bone tissue engineering.
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Mashali, Farzin, Ethan M. Languri, Gholamreza Mirshekari, Jim Davidson, and David Kerns. "Microstructural and Thermal Characterization of Diamond Nanofluids." In ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87496.
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Conventional heat transfer fluids such as water, ethylene glycol, and mineral oil, that are used widely in industry suffer from low thermal conductivity. On the other hand, diamond has shown exceptional thermal properties with a thermal conductivity higher than five times of copper and about zero electrical conductivity. To investigate the effectiveness of nanodiamond particles in traditional heat transfer fluids, we study deaggregated ultra-dispersed diamonds (UDD) using X-ray diffraction analysis (XRD) and transmission electron microscopy (TEM). Furthermore, nanodiamond nanofluids were prepared at different concentrations in deionized (DI) water as the base fluid. Particle size distribution was investigated using TEM and the average particle size have been reported around 6 nm. The thermal conductivity of nanofluids was measured at different concentrations and temperatures. The results indicate up to 15% enhancement in thermal conductivity compared with the base fluid and thermal conductivity increases with temperature and particle loading. The viscosity raise in the samples have been negligible.
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Zhang, Qingwei, Peter Lelkes, and Jack Zhou. "Nanodiamond Reinforced PLLA Composites for Bone Tissue Engineering." In ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84379.
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Nanotechnology shows us many innovations and it is generally accepted view that many could be further developed and applied in tissue engineering. A novel composite material has been produced for bone scaffolds utilizing the biodegradable polymer poly(L-lactic acid) (PLLA) and octadecylamine functionalized nanodiamond (ND-ODA). The composites were characterized by hardness testing (Rockwell) and differential scanning calorimetry (DSC). DSC analysis of the composites showed no significant thermal behavior changes when adding ND into the polymer matrix. Rockwell result shows ND-ODA improves mechanical strength of composites 4 folds. To test the usefulness of ND-ODA/PLLA as a matrix for supporting cell growth, 7F2 Osteoblasts were cultured on scaffolds for 3 days. The results showed that the addition of ND-ODA has almost no influence on cell growth, which indicates the composites are biocompatible. All these results combined suggest that ND-ODA/PLLA might provide a novel composite suitable for bone tissue engineering application.
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Datta, Aditi, Yao Fu, Mesut Kirca, and Albert To. "Structure and Surface Properties of Nanodiamonds: A First-Principles Multiscale Approach." In ASME 2010 First Global Congress on NanoEngineering for Medicine and Biology. ASMEDC, 2010. http://dx.doi.org/10.1115/nemb2010-13266.
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The goal of this work is to gain fundamental understanding of the surface structure of functionalized detonation nanodiamonds (NDs) using quantum mechanics (QM) based multiscale modeling and simulation. The study entails a multiscale approach to bridge the length scale between the real sizes of ND being fabricated (∼4 nm) and the size allowed by employing first-principles based modeling (< 1 nm). At first, the structure of NDs of technologically relevant size (∼4 nm) was optimized using classical mechanics based molecular mechanics simulations. QM based density functional theory (DFT) was then employed to simulate the structure and analyze the properties of relevant parts of the optimized cluster. This work is extended to NDs functionalized with carboxylic acid (-COOH) and carbonyl oxygen (=O), which help to guide further experiments on functionalization of NDs and their use as carriers of drug molecules to the desired site.