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Journal articles on the topic 'Gold particle'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Doremus, Robert H., and Pratima Rao. "Optical properties of nanosized gold particles." Journal of Materials Research 11, no. 11 (1996): 2834–40. http://dx.doi.org/10.1557/jmr.1996.0358.

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Gold particles smaller than 2 nm in diameter were grown in glass. Their optical absorption spectrum did not show the usual plasma absorption band for gold particles; this band was spread by the small particle size. The absorption spectrum was calculated from the bulk optical properties of gold, modified for the small particle size; there was good agreement between calculated and measured spectra. The smallest particles containing from 20 to 40 gold atoms showed a λ−4 dependence of absorption on wavelength λ. This result implies that the absorption in these particles was entirely from free elec

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2

Ghadamgahi, Sedigheh. "How Recyclability can Reduce Induction Period of Gold Nanocatalysts." Journal of Nano Research 57 (April 2019): 1–6. http://dx.doi.org/10.4028/www.scientific.net/jnanor.57.1.

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The effect of recyclability on the catalytic activity of supported Au101(PPh3)21Cl5 nanoparticles (1.0 wt% Au101/AC) was investigated for benzyl alcohol oxidation under mild conditions. The influence of recyclability on the catalytic activity of activated Au101/AC nanocatalysts was studied trough a comparison of gold particle diameter and also catalysts conversion between the fresh (as synthesized) and recycled gold catalysts. The monitoring of gold particle diameters by transmission electron microscopy (TEM) showed that the gold particles size gradually increased during the catalytic reaction

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Burgoyne, Thomas, and Clare E. Futter. "Gold Particle Analyser: Detection and quantitative assessment of electron microscopy gold probes." PLOS ONE 18, no. 7 (2023): e0288811. http://dx.doi.org/10.1371/journal.pone.0288811.

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Gold particle probes are an essential electron microscopy tool to examine protein localisation, as well as protein trafficking. They can be introduced into living cells when conjugated to a protein that is endocytosed or to an antibody against a cell surface protein. Alternatively, gold particles can be introduced into fixed cells or tissue when conjugated to antibodies, immunoglobulin binding molecules or chemical probes applied to permeabilised samples or electron microscopy sections. Colloidal gold particles that have not been enlarged through chemical (gold or silver) enhancement are typic

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4

Khertek, Chayana, and Anatoly Sazonov. "Deformational and metasomatic transformations of detrital gold in the course of placer formation." Ores and metals, no. 4 (January 17, 2024): 74–91. http://dx.doi.org/10.47765/0869-5997-2023-10020.

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The richest gold placers periodically mined since 1838 are known in the north of the Republic of Tyva, within the basin of the Amyl and Sistig-Khem rivers. Ag-Au gold is the most common, and cuprous and mercuric varieties are presented in small quantities. Lode gold occurrences are confined to quartz veins and have no economic value. Detrital gold in the placer deposits has the typical typomorphic features of placer gold: roundness, compositional heterogeneity, the presence of rims and intergranular veinlets of high-fineness gold, and particle deformation structures. We have considered the tra

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Rea, Maria Angelica D., Joël Brugger, Barbara Etschmann, Victor Okrugin, and Jeremiah Shuster. "Gold particles from Kamchatka: A brief look at gold biogeochemical cycling in a distinct environment." Mineralogical Magazine 85, no. 1 (2021): 68–75. http://dx.doi.org/10.1180/mgm.2021.17.

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AbstractKamchatka is a peninsula located on the far eastern side of Russia and is a geologically active region within the Pacific Ring of Fire. Placer gold particles were obtained from a stream located in the Yelizovsky District and were compared to particles from regions at similar latitudes. Russian gold particle surface textures and morphologies were characterised optically and using electron microscopy, and bacteria occurring on the surface of particles were inferred from detected amplicon sequence variants (ASVs). The gold particles contained remarkably variable gold surface textures with

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6

Hainfeld, James F., Frederic R. Fumya, and Richard D. Powell. "A new 1.4 nm gold-Fab probe." Proceedings, annual meeting, Electron Microscopy Society of America 49 (August 1991): 284–85. http://dx.doi.org/10.1017/s0424820100085721.

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A major advance in high resolution EM immunoprobes has recently been achieved: The smallest gold particles easily seen directly in the TEM have been coupled to Fab fragments thus making them the smallest gold-antibody probe commercially available.The gold particle, NanogoldTM, is 1.4 nm in diameter with a very controlled size range, ± 10% (Fig. 1). This is in sharp contrast to other small gold preparations, such as Auroprobe One (Janssen Life Sciences) which actually ranges from 1-3 nm.The Fab conjugate (Fig. 2) has close to one gold particle per Fab fragment. This again is different from othe

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D'Andrea, Michael, Michele Forte, and Jiang Gu. "A quantitative study of silver enhancement of differently sized gold labeling particles for postembedding indirect immunogold EM." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 3 (1990): 754–55. http://dx.doi.org/10.1017/s0424820100161333.

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The post-embedding indirect immunogold staining method has been widely used in electron microscopy. In this technique, colloidal gold labeling particles are round, electron dense and uniform in size with diameters from 5nm to 40nm. At optimal conditions, the smaller the labeling gold particles, the higher the maximum detecting sensitivity (MDS) for the immunostaining. Janssen Pharmaceutical (Piscataway, NJ), developed 1 nm gold, perhaps the most sensitive gold probe to date, in 1989. Even at the higher electron microscopic magnifications, x100,000 - 200,000, the resolution of the lnm gold part

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8

Ellis, I. O., J. Bell, and J. D. Bancroft. "An investigation of optimal gold particle size for immunohistological immunogold and immunogold-silver staining to be viewed by polarized incident light (EPI polarization) microscopy." Journal of Histochemistry & Cytochemistry 36, no. 1 (1988): 121–24. http://dx.doi.org/10.1177/36.1.3335767.

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We investigated the optimal gold particle size for use with polarized incident light (epi polarization) microscopy with immunogold immunohistological preparation in both immunogold indirect (IGS) and silver-enhanced immunogold-silver staining (IGSS) techniques. A range of gold particle sizes from 5 nm-40 nm was used along with tissue of known immunoreactivity with a well-characterized primary monoclonal antibody. Checkerboard titrations were carried out for each technique and for each particle size. The preparations were viewed using a standard polarized incident light microscope and assessed

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9

De Roe, C., P. J. Courtoy, and P. Baudhuin. "A model of protein-colloidal gold interactions." Journal of Histochemistry & Cytochemistry 35, no. 11 (1987): 1191–98. http://dx.doi.org/10.1177/35.11.3655323.

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We prepared homogeneous populations of colloidal gold particles of various sizes. These were analyzed for size distribution and number of particles per unit volume. On exposure to increasing concentrations of insulin, myoglobin, protein A, peroxidase, serum albumin, galactosylated serum albumin, lactoferrin, transferrin, catalase, low-density lipoprotein, ferritin, and polymeric IgA, protein binding was a saturable process. Using serum albumin, we verified that a reversible equilibrium was reached within 15 minutes. Scatchard analysis of the interactions between all of these proteins and the g

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10

Lea, P., and D. K. Gross. "Effective diameters of protein A-gold and goat anti-rabbit-gold conjugates visualized by field emission scanning electron microscopy." Journal of Histochemistry & Cytochemistry 40, no. 6 (1992): 751–58. http://dx.doi.org/10.1177/40.6.1588022.

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High-voltage (15-30 kV) field emission scanning electron microscopy (FESEM) was used to evaluate the effects of gold particle size and protein concentration on the formation of protein-gold complexes. Six colloidal gold sols were prepared, ranging in diameter from 7.6 to 39.8 nm. The minimal protecting amounts (m.p.a.) of protein A and goat anti-rabbit antibody (GAR) were experimentally determined. Gold particles were conjugated at the m.p.a., one half the m.p.a., and ten times the m.p.a. for both proteins, and protein-gold complexes prepared for FESEM. The smallest colloidal gold particles re

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11

Yokota, S. "Effect of particle size on labeling density for catalase in protein A-gold immunocytochemistry." Journal of Histochemistry & Cytochemistry 36, no. 1 (1988): 107–9. http://dx.doi.org/10.1177/36.1.3335766.

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Effect of particle size on labeling intensity in protein A-gold immunocytochemistry was studied. Catalase labeling of rat liver peroxisomes was used as a labeling model. Ultra-thin sections of Lowicryl K4M-embedded rat liver were stained for catalase with protein A-gold (pAg) probes. Five different sizes of colloidal gold probes, from 5 nm to 38 nm in diameter, were prepared. Labeling intensity decreased as the particle size of the pAg probes increased. The highest labeling was obtained by the 5-nm pAg probe and the lowest by the 38-nm pAg probe. Quantitative analysis also showed that labeling

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12

Fernández-Navarro, C., A. J. Gutiérrez-Esparza, J. M. Montejano-Carrizales, and S. J. Mejía-Rosales. "Effect of Equivalent Sites on the Dynamics of Bimetallic Nanoparticles." MRS Proceedings 1479 (2012): 1–8. http://dx.doi.org/10.1557/opl.2012.1589.

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ABSTRACTUsing a Sutton and Chen interatomic potential, we study the molecular dynamics of Au-Pd nanoparticles with an initial icosahedral structure at different temperatures and concentrations, where each relative concentration of the 561-atom particles was made by placing atoms of the same species at equivalent sites, in order to identify under which conditions the melting transition temperature appears for each particle. In addition, we compute global order parameters in order to correlate the obtained results with the caloric curves of each particle. As a result, we observe that the melting

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13

Trbojevich, R., N. Pellegri, A. Frattini, O. de Sanctis, P. J. Morais, and R. M. Almeida. "Preparation and isolation of gold nanoparticles coated with a stabilizer and sol-gel compatible agent." Journal of Materials Research 17, no. 8 (2002): 1973–80. http://dx.doi.org/10.1557/jmr.2002.0292.

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In this work an attractive technique is presented that brings together the advantage of the micelle reverse technique to control the particle growth and the efficiency of the amine silanes as sol-gel-compatible surface modifiers. The diamino silane is far from being a passive agent in the formation process of the gold particle; it strongly modifies the growth of the gold particle in the reverse micelle. The diamino silane allows the gold particles to keep their individual properties unaltered throughout the process, which ends with their incorporation into a SiO2–TiO2 sol-gel thin film.

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14

Ghatak, J., B. Sundaravel, K. G. M. Nair, and P. V. Satyam. "MeV Gold Ion Induced Sputtered Nanoparticles from Gold Nanostructures: Dependence of Incident Fluxand Temperature." Journal of Nanoscience and Nanotechnology 8, no. 8 (2008): 4318–21. http://dx.doi.org/10.1166/jnn.2008.an56.

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The high-energy and heavy-ion induced sputtered particles from nanostructures under various conditions can result in variety of size distributions. 1.5 MeV Au2+ ions induced sputtering from isolated gold nanostructures deposited on silicon substrate have been studied as a function of incident ion flux (dose rate) and the sputter particle catcher at low temperature. At higher fluxes, a bimodal distribution of the sputtered particles has been observed. Cross-sectional transmission electron microscopy and Rutherford backscattering spectrometry measurements showed that the sputter particle size di

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15

Dominy, Simon, Ian Platten, Hylke Glass, Saranchimeg Purevgerel, and Brian Cuffley. "Determination of Gold Particle Characteristics for Sampling Protocol Optimisation." Minerals 11, no. 10 (2021): 1109. http://dx.doi.org/10.3390/min11101109.

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Sampling, sample preparation, and assay protocols aim to achieve an acceptable estimation variance, as expressed by a relatively low nugget variance compared to the sill of the variogram. With gold ore, the typical heterogeneity and low grade generally indicate that a large sample size is required, and the effectiveness of the sampling protocol merits attention. While sampling protocols can be optimised using the Theory of Sampling, this requires determination of the liberation diameter (dℓAu) of gold, which is linked to the size of the gold particles present. In practice, the liberation diame

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16

Ackerley, C. A., A. Tilups, and L. E. Becker. "Strategies Insuring the Optimal use of IgG or FAB* Fragments Covalently Bound to 1.4 NM Nanogold ™ in Immunogold Labeling Procedures." Microscopy and Microanalysis 4, S2 (1998): 988–89. http://dx.doi.org/10.1017/s143192760002506x.

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Gold particles as markers in immunocytochemical procedures have undergone tremendous changes since their introduction by Faulk and Taylor (1). With the development of both small colloidal gold (<3 nm) and 1.4 nm gold clusters (Nanogold™) for immunocytochemical labeling, steric hindrance has been significantly reduced. In a comparative study using colloidal gold-anti CD3 complexes and particle sizes of 5 nm, 3 nm and less than 3 nm on surface labeling of lymphocytes there was a 1.5 fold increase in labeling density when 3 nm particles were used. There was no increase when smaller particles w

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17

Newman, R., G. W. Butcher, B. Bullard, and K. R. Leonard. "A method for determining the periodicity of a troponin component in isolated insect flight muscle thin filaments by gold/Fab labelling." Journal of Cell Science 101, no. 3 (1992): 503–8. http://dx.doi.org/10.1242/jcs.101.3.503.

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Insect flight muscle has a large component (Tn-H) in the tropomyosin-troponin complex that is not present in vertebrate striated muscle thin filaments. Tn-H is shown by gold/Fab labelling to be present at regular intervals in insect flight muscle thin filaments. The Fab fragment of a monoclonal antibody to Tn-H was conjugated directly with colloidal gold and this probe used to label isolated thin filaments from the flight muscle of Lethocerus indicus (water bug). The distribution of gold particles seen in electron microscope images of negatively stained thin filaments was analysed to show that

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18

Watanabe, Hideo, Masayoshi Fuji, Atsuko Tada, and Minoru Takahashi. "Electrophoretic and Electrolytic Deposition of Gold Nanoparticles on a Graphite Carbon Plate." Key Engineering Materials 412 (June 2009): 71–75. http://dx.doi.org/10.4028/www.scientific.net/kem.412.71.

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Nobel metal particles with nanometer size have attracted keen interest because of, for example, their high catalytic activity to be applied for industrial applications. In this study, nano-sized gold particles were deposited onto a graphite carbon plate by two approaches: 1) electrophoresis of colloidal gold nanoparticles, 2) electrolysis of chlorauric acid. For former case, commercially-available gold nanoparticle and anionic mercapto ligand-stabilized gold nanoparticles, synthesized by citric acid reduction of chlorauric acid, were used. Size and morphology of the gold particles deposited we

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Guzmán, C., Gloria Del Angel, Ricardo Gómez, et al. "Gold Particle Size Determination on Au/TiO₂-CeO₂ Catalysts by Means of Carbon Monoxide, Hydrogen Chemisorption and Transmission Electron Microscopy." Journal of Nano Research 5 (February 2009): 13–23. http://dx.doi.org/10.4028/www.scientific.net/jnanor.5.13.

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Au/TiO2 and Au/TiO2-CeO2 catalysts were prepared by the sol-gel method and carbon monoxide, hydrogen chemisorption and TEM spectroscopy have been exploited to determine the size of gold particles. The gold nanoparticles (8.1 to 2.1 nm) were deposited by using the deposition-precipitation method. The XRD characterization shows the presence of anatase as the TiO2 crystalline phase; while by XPS spectroscopy, the presence of Au°, Au2O3, Ce3+ and Ce4+ species co-existing in the Au/TiO2-CeO2 catalysts is shown. The characterizations by TPD-CO as well as by TPD-H2 (temperature programmed desorption)

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Sanyal, Santonu Kumar, and Jeremiah Shuster. "Gold particle geomicrobiology: Using viable bacteria as a model for understanding microbe–mineral interactions." Mineralogical Magazine 85, no. 1 (2021): 117–24. http://dx.doi.org/10.1180/mgm.2021.19.

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AbstractThe biogeochemical cycling of gold has been proposed from studies focusing on gold particle morphology, surface textures and associated bacteria living on the surface of gold particles. Additionally, it has been suggested that metabolically active bacteria on particles catalyse gold dissolution and gold re-precipitation processes, i.e. fluid–bacterial–mineral interaction within microenvironments surrounding particles. Therefore, the isolation and characterisation of viable bacteria from gold particles can be used as a model to improve the understanding of bacterial–gold interactions. I

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Du, F., M. Baune, A. Kück, and J. Thöming. "Dielectrophoretic Gold Particle Separation." Separation Science and Technology 43, no. 15 (2008): 3842–55. http://dx.doi.org/10.1080/01496390802365779.

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22

Nidhi, Vagisha, Arthur Allaire, Zakariya Ait Athmane, et al. "Making Mobile Nanotechnology Accessible: Is the Explicit Preparation of Janus Nanoparticle Necessary to Achieve Mobility?" Nanomaterials 14, no. 22 (2024): 1796. http://dx.doi.org/10.3390/nano14221796.

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This study compares the mobility behaviour, in a H2O2 environment, of three different geometries of hybrid particle made of silica core functionalized by gold (nanoparticles or layer). It is known that the decomposition of H2O2 on gold surfaces drives mobility; however, the link between mobility orientation and the organization of gold on silica surfaces is still questionable. While conventional wisdom posits that asymmetric designs are crucial for generating phoretic forces or localized bubble propulsion, recent research suggests that symmetrical particles may also exhibit motility. To addres

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Wang, Peng, and Lin Hua Zhu. "Preparation of Layered Double Hydroxide (LDHs)-Supported Gold Catalysts and its Activity and Stability for Low-Temperature CO Oxidation." Advanced Materials Research 396-398 (November 2011): 841–47. http://dx.doi.org/10.4028/www.scientific.net/amr.396-398.841.

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A new type of gold catalysts have been prepared by supporting gold colloids on layered double hydroxide (MgAl-LDHs) carrier at different pH values. CO oxidation reaction at room temperature was used as probe reaction to test the oxidation activity of the gold catalysts, and X-ray diffraction (XRD), X-ray fluorescence (XRF) and high resolution transmission election microscopy (HRTEM) techniques were used to characterize the physical phase, gold loading, morphology as well as mean diameter of gold particles and particle distribution of the represented gold catalyst samples. Influence of pH value

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Albrecht, R. M., S. R. Simmons, S. J. Eppell, and R. E. Marchant. "Correlative microscopy of colloidal gold-labeled and unlabeled cell-surface-associated molecules: LV-SEM, SEM, and VLM." Proceedings, annual meeting, Electron Microscopy Society of America 52 (1994): 1016–17. http://dx.doi.org/10.1017/s0424820100172814.

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Video enhanced, interference based light microscopy (VLM) is sufficiently sensitive to permit observation, via the inflated diffraction image, of colloidal gold particles as small as 15nm. These particles can be directly coupled to ligands such that ligand binding, distribution, and ligand-receptor complex movement can be observed on living cells (Fig.1a-d) and correlated subsequently with HVEM and/or SEM images of the same cell (Fig. 1e). The size of the gold particles used in these studies is such that, other than for very large ligands, generally two or more ligand molecules are bound per p

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Kunene, Avela, Michael Claeys, and Eric van Steen. "Pt/Au Alloys as Reduction Promoters for Co/TiO₂ Fischer-Tropsch Catalysts." Advanced Materials Research 1019 (October 2014): 365–71. http://dx.doi.org/10.4028/www.scientific.net/amr.1019.365.

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Noble metals, such as platinum or gold, may promote the reduction of cobalt in supported cobalt catalysts either by direct contact or indirectly via hydrogen spill-over. The synthesis go gold nano-particles using THPC in the presence of a calcined Co/TiO2-catalyst precursor results in a broadening of the gold particle size distribution possibly due to the association of gold with Co3O4. This was not observed for platinum and platinum-gold alloys synthesized in the same manner. Platinum-gold alloys are less effective than platinum as a reduction promoter, possibly due to the presence of gold on

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Liu, Jun, Mehmet Sarikaya, and Ilhan A. Aksay. "Crystal structure-size relationship in ultrafine metallic particles." Proceedings, annual meeting, Electron Microscopy Society of America 47 (August 6, 1989): 266–67. http://dx.doi.org/10.1017/s0424820100153300.

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Ultrafine particles usually have unique physical properties. This study illustrates how the lattice defects and interfacial structures between particles are related to the size of ultrafine crystalline gold particles.Colloidal gold particles were produced by reducing gold chloride with sodium citrate at 100°C. In this process, particle size can be controlled by changing the concentration of the reactant. TEM samples are prepared by transferring a small amount of solution onto a thin (5 nm) carbon film which is suspended on a copper grid. In this work, all experiments were performed with Philip

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Gürdal, Emre, Simon Dickreuter, Fatima Noureddine, Pascal Bieschke, Dieter P. Kern, and Monika Fleischer. "Self-assembled quasi-hexagonal arrays of gold nanoparticles with small gaps for surface-enhanced Raman spectroscopy." Beilstein Journal of Nanotechnology 9 (July 12, 2018): 1977–85. http://dx.doi.org/10.3762/bjnano.9.188.

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The fabrication and optical characterization of self-assembled arrangements of rough gold nanoparticles with a high area coverage and narrow gaps for surface-enhanced Raman spectroscopy (SERS) are reported. A combination of micellar nanolithography and electroless deposition (ED) enables the tuning of the spacing and size of the noble metal nanoparticles. Long-range ordered quasi-hexagonal arrays of gold nanoparticles on silicon substrates with a variation of the particle sizes from about 20 nm to 120 nm are demonstrated. By increasing the particle sizes for the homogeneously spaced particles,

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Ji, Qiang, Guangsheng Li, Xingfu Zhu, Tengyue Gao, and Mingming Cai. "Research on the Efficient Recovery Technology of Gold Mineral in an Oxidized Ore." E3S Web of Conferences 625 (2025): 02008. https://doi.org/10.1051/e3sconf/202562502008.

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In view of the characteristics of high content of gold minerals in limonite and great difficulty of flotation recovery, the research on process mineralogy and efficient recovery technology was carried out respectively. The results of process mineralical analysis show that the particle size of gold mineral particles is coarse, the average particle size is 18.33μm, and the associated content with limonite is 28.36%, which is difficult to recover by a single flotation process. Through the efficient recovery technology research, the combined process of heavy dressing and flotation can realize the

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Lilly Anitha, M., J. Riya, J. Rinita, P. Christma Eunice, and N. S. Nirmala Jothi. "Facile Green Synthesis and Characterisation of Gold Nanoparticles using Fenugreek Seeds and Honey." Journal of Physics: Conference Series 2070, no. 1 (2021): 012048. http://dx.doi.org/10.1088/1742-6596/2070/1/012048.

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Abstract Gold nanoparticles are frequently employed in a range of biological applications because of its versatility in biosynthetic pathways and complexation, good biocompatibility and ease of detection. This study discusses the application of green chemistry in the production of gold nanoparticles using fenugreek and honey. It discusses nanoparticle characterisation in order to investigate structural, morphological, and optical characteristics. The mean crystalline size of fenugreek-mediated gold nanoparticles is 12.035nm nm, while honey-mediated gold nanoparticles are almost 42.2225 nm, acc

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GERASIMENKO, Tatyana, Iya RUBAYEVA, Ruslan MAKSIMOV, and Vyacheslav VASILIEV. "Peculiarities of poly disperse particle interaction in gold micro dispersions flotation processes." Sustainable Development of Mountain Territories 15, no. 1 (2023): 97–113. http://dx.doi.org/10.21177/1998-4502-2023-15-1-97-113.

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Introduction. In flotation of large particles, the approach of a particle to a bubble is provided by inertial forces, while in the case of small particles this process proceeds inertially. Inertia less hydrodynamic interaction with the bubble - movement with the liquid flow without contact with the surface of the bubble up to its lower hemisphere - is the main reason for losses of small particles in flotation. Materials and methods. Research was carried out on washing wastes of gold placers of the Petinikan-Bastakh group of deposits and on a sample of ore from the Natalka deposit. Results. It

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Larichev, Yu V., B. L. Moroz, P. A. Pyrjaev, and V. I. Bukhtiyarov. "SAXS Application for the Determination of the Gold Nanoparticle Sizes in Au/C Catalysts: Advantages over Other Methods." Кинетика и катализ 64, no. 6 (2023): 822–36. http://dx.doi.org/10.31857/s0453881123060096.

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In the case of Au/C catalysts have been shown advantages of application SAXS with masking liquid technique for determining supported metal particle sizes compared with TEM and XRD as standard methods. According to SAXS data particle size distributions of gold in a wide range (1–50 nm) were obtained with full consideration of all size fractions of particles present in the samples under study. Also values of the mass fraction of “X-ray amorphous” gold particles with size less than 4 nm (WSAXS) were determined. It has been found that the oxidative treatment of the carbon support before deposition

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Bedford, Erin E., Christophe Méthivier, Claire-Marie Pradier, Frank Gu, and Souhir Boujday. "Nanostructured and Spiky Gold Shell Growth on Magnetic Particles for SERS Applications." Nanomaterials 10, no. 11 (2020): 2136. http://dx.doi.org/10.3390/nano10112136.

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Multifunctional micro- and nanoparticles have potential uses in advanced detection methods, such as the combined separation and detection of biomolecules. Combining multiple tasks is possible but requires the specific tailoring of these particles during synthesis or further functionalization. Here, we synthesized nanostructured gold shells on magnetic particle cores and demonstrated the use of them in surface-enhanced Raman scattering (SERS). To grow the gold shells, gold seeds were bound to silica-coated iron oxide aggregate particles. We explored different functional groups on the surface to

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Burry, R. W., D. D. Vandré, and D. M. Hayes. "Silver enhancement of gold antibody probes in pre-embedding electron microscopic immunocytochemistry." Journal of Histochemistry & Cytochemistry 40, no. 12 (1992): 1849–56. http://dx.doi.org/10.1177/40.12.1453003.

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In pre-embedding EM immunocytochemistry with gold probes, the gold must be small enough to penetrate through cell membranes treated with mild detergents. Antibodies labeled with small gold probes (1-1.4 nm) are too small to be resolved in thin sections but can be seen if they are silver-enhanced after the gold has bound to the antigens in the cells. We investigated several aspects of gum arabic-silver lactate-hydroquinone enhancement solution (Danscher solution) by examining gold-conjugated antibodies embedded in agar, sectioned on a vibrotome, and enhanced with different solutions. The rate o

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Nakamura, Takahiro, Yuzuru Mochidzuki, and Shunichi Sato. "Fabrication of gold nanoparticles in intense optical field by femtosecond laser irradiation of aqueous solution." Journal of Materials Research 23, no. 4 (2008): 968–74. http://dx.doi.org/10.1557/jmr.2008.0115.

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Gold particles were fabricated by the high-intensity femtosecond laser irradiation of gold (III) chloride trihydrate (HAuCl4) aqueous solution. The structure and size distribution of the prepared particles were evaluated by transmission electron microscopy. The configuration of the gold particles varied with the concentration of the HAuCl4 aqueous solution. The mean particle size and size distribution were changed by the addition of polyvinylpyrrolidone (PVP), which acted as a dispersant, and monodispersed gold nanoparticles with a diameter of about 3 nm were successfully fabricated. The forma

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Amézaga González, María Fernanda, Jazzely Acosta Bezada, Víctor Gómez Flores, et al. "Effect of Physiological Fluid on the Photothermal Properties of Gold Nanostructured." International Journal of Molecular Sciences 24, no. 9 (2023): 8339. http://dx.doi.org/10.3390/ijms24098339.

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Colloidal gold particles have been extensively studied for their potential in hyperthermia treatment due to their ability to become excited in the presence of an external laser. However, their light-to-heat efficiency is affected by the physiologic environment. In this study, we aimed to evaluate the ability of gold sphere, rod, and star-shaped colloids to elevate the temperature of blood plasma and breast cancer-simulated fluid under laser stimulation. Additionally, the dependence of optical properties and colloid stability of gold nanostructures with physiological medium, particle shape, and

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Dou, G. B., Y. C. Chan, and Johan Liu. "Electrical Conductive Characteristics of Anisotropic Conductive Adhesive Particles." Journal of Electronic Packaging 125, no. 4 (2003): 609–16. http://dx.doi.org/10.1115/1.1604808.

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In anisotropic conductive adhesive (ACA) interconnections, the particles are electrical conductors providing current paths in the fine pitch electronic packaging as well as physical parts connecting with the chip bumps and the substrate pads through the mechanical deformation interfaces. The primary object of this fundamental research is to reveal the electrical conductive characteristics of Ni/Au coated resin particles. Such an ACA particle resistance is resulted from two metal coated layers, which are two parallel resistors in the circuit determined by the particle transformation degree. In

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TAKAMI, T., and S. INO. "ORGANOMETALLIC MICELLE COMPRISED OF GOLD MULTIPLY TWINNED PARTICLE AND SELF-ASSEMBLED THIOLS." Surface Review and Letters 04, no. 06 (1997): 1381–84. http://dx.doi.org/10.1142/s0218625x97001851.

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We have demonstrated the method to stabilize gold particles by using the technique of self-assembled alkanethiol. Au and S peaks of the X-ray spectroscopy show that it consists of Au particle and alkanethiols. The chemical bond between Au and S is confirmed by the NMR spectrum. The typical size of the particle is less than 30 nm, observed by the scanning electron microscope. The predicted structure of the thiol-adsorbed particle is like a micelle, and we have named this particle the organometallic micelle.

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Ghasemi-Jangjoo, Amir, and Hosein Ghiasi. "Monte Carlo study on the gold and gadolinium nanoparticles radio-sensitizer effect in the prostate 125I seeds radiotherapy." Polish Journal of Medical Physics and Engineering 25, no. 3 (2019): 165–69. http://dx.doi.org/10.2478/pjmpe-2019-0022.

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Abstract Monte Carlo and TL dosimetry applied to the characterization of 125I brachytherapy with a different design with other 125I seeds. In a water phantom, lattice configuration simulated with 125I seed in the center and 10 nm gold and gadolinium nan-particle filed voxels. This simulation conducted to the characterization of the nano-particles DEF in low energy and prostate tissue. To study of the prostate brachytherapy, a humanoid computational phantom developed by CT slices applied. KTMAN-2 computational phantom contains 29 organs and 19 skeletal regions and was produced from cross-sectio

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Navas Jaramillo, Santiago Jose, and Renato Efren Gonzalez Zuñiga. "Characteristics of Mineralization of Refractory Gold and Its Influence on Cyanide Gold Leaching Rates: A Case Study in Pituca II, Zamora Chinchipe, Ecuador." Minerals 15, no. 5 (2025): 523. https://doi.org/10.3390/min15050523.

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The recovery of gold in metallurgical processes is significantly influenced by the presence of refractory minerals. This study investigates the mineralogical characteristics of refractory gold in the Pituca II ore deposit, with a focus on identifying the sulfide minerals that encapsulate gold particles and understanding their impact on gold recovery rates via cyanidation leaching. To establish a theoretical basis for optimizing gold recovery, a comprehensive suite of analytical techniques including electron microprobe analysis, petrographic analysis, laser ablation inductively coupled plasma m

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Majerič, Peter, Darja Feizpour, Bernd Friedrich, Žiga Jelen, Ivan Anžel, and Rebeka Rudolf. "Morphology of Composite Fe@Au Submicron Particles, Produced with Ultrasonic Spray Pyrolysis and Potential for Synthesis of Fe@Au Core–Shell Particles." Materials 12, no. 20 (2019): 3326. http://dx.doi.org/10.3390/ma12203326.

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Iron core–gold shell (Fe@Au) nanoparticles are prominent for their magnetic and optical properties, which are especially beneficial for biomedical uses. Some experiments were carried out to produce Fe@Au particles with a one-step synthesis method, Ultrasonic Spray Pyrolysis (USP), which is able to produce the particles in a continuous process. The Fe@Au particles were produced with USP from a precursor solution with dissolved Iron (III) chloride and Gold (III) chloride, with Fe/Au concentration ratios ranging from 0.1 to 4. The resulting products are larger Fe oxide particles (mostly maghemite

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Stolle, Heike Lisa Kerstin Stephanie, Andrea Csáki, Jan Dellith, and Wolfgang Fritzsche. "Modification of Surface Bond Au Nanospheres by Chemically and Plasmonically Induced Pd Deposition." Nanomaterials 11, no. 1 (2021): 245. http://dx.doi.org/10.3390/nano11010245.

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In this work we investigated methods of modifying gold nanospheres bound to a silicon surface by depositing palladium onto the surfaces of single nanoparticles. Bimetallic Au-Pd nanoparticles can thus be gained for use in catalysis or sensor technology. For Pd deposition, two methods were chosen. The first method was the reduction of palladium acetate by ascorbic acid, in which the amounts of palladium acetate and ascorbic acid were varied. In the second method we utilized light-induced metal deposition by making use of the plasmonic effect. Through this method, the surface bond nanoparticles

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Zubair, Muhammad, Muhammad Shahid Rafique, Afshan Khalid, Tahir Yaqub, Suliman Yousef Alomar, and Huma Gohar. "Synthesis of Gold-PVP Nanostructured Composites by Microplasma: A Test to Study Their Inhibiting Tendency of Avian Influenza Virus Activity." Applied Sciences 12, no. 11 (2022): 5352. http://dx.doi.org/10.3390/app12115352.

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Gold–polymer nanostructured composites have a great potential in the biomedical and advanced materials field as an antimicrobial agent against various pathogens, especially viruses. In the present work, gold and gold-PVP colloids have been prepared by the electrochemical reduction of hydrogen tetrachlorauric acid (HAuCl4·3H2O) precursor. The atmospheric pressure microplasma technique was used as a reducing agent, while D-Fructose was used as a stabilizing agent in the synthesis process. X-ray Diffraction (XRD) confirmed the crystalline behavior of both gold nanostructured particles and gold-PV

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Masson, François-Xavier, Georges Beaudoin, and Denis Laurendeau. "Quantification of the morphology of gold grains in 3D using X-ray microscopy and SEM photogrammetry." Journal of Sedimentary Research 90, no. 3 (2020): 286–96. http://dx.doi.org/10.2110/jsr.2020.16.

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ABSTRACT The shape of gold is widely used in mineral exploration and in sedimentology to estimate the distance of transport from the source to the site of deposition. However, estimation of the morphology is based on qualitative observations or on the quantification of shape in 2D. The 3D analysis of grain shape is useful for accurate morphometric quantification and to evaluate its volume, which is related to particle size. This study compares X-ray 3D microscope and 3D SEM photogrammetry to reconstruct the shape of gold particles. These new methods are exploited to quantify the shape of gold

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Ghitescu, L., and M. Bendayan. "Immunolabeling efficiency of protein A-gold complexes." Journal of Histochemistry & Cytochemistry 38, no. 11 (1990): 1523–30. http://dx.doi.org/10.1177/38.11.2212613.

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A systematic study of the adsorption of protein A on colloidal gold particles varying in size from 5-16 nm was performed at different protein concentrations. The number of protein A molecules bound per colloidal particle was evaluated and the Scatchard analysis of the adsorption parameters was applied for each size of the colloid. The binding of protein A to the colloidal gold surface exhibited the same affinity pattern for all of the particle sizes. At low concentrations of stabilizing protein, adsorption took place with high affinity (Kd 1.96-3.3 nM) and the maximum number of protein A molec

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Adlim, Adlim, and Mohamad Abu Bakar. "PREPARATION OF CHITOSAN-GOLD NANOPARTICLES: PART 1 (OF 2). EFFECT OF REDUCING TECHNIQUE." Indonesian Journal of Chemistry 8, no. 2 (2010): 184–88. http://dx.doi.org/10.22146/ijc.21621.

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Chitosan-stabilized gold nanoparticles were synthesized in aqueous formic acid, citric, or acetic acid with and without chitosan as the stabilizer. Refluxing in methanol, addition of hydrazine or sodium borohydride, photo-irradiation were employed as the reducing agents & reduction technique of gold ions. Dispersed particles of chitosan-stabilized gold were obtained in aqueous acetic acid-methanol solution. The chitosan-stabilized gold colloids (chi-Au) were dispersed and the particle size were in range of 9-30 nm, some of which were crystalline with various shapes. Chi-Au prepared with hy

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Abu Bakar, Mohamad, Jamil Ismail, Cheng Hoon Teoh, Wei Leng Tan, and Noor Hana Hanif Abu Bakar. "Modified Natural Rubber Induced Aqueous to Toluene Phase Transfer of Gold and Platinum Colloids." Journal of Nanomaterials 2008 (2008): 1–8. http://dx.doi.org/10.1155/2008/130295.

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Citrate-stabilized gold and platinum particles were prepared in aqueous phase and transferred to toluene phase by employing 2-propanol as the transfer agent. It was found that the modified natural rubber (ENR) induced the phase transfer and assisted the dispersion of the citrate-free metal particles into the organic phase. The amounts of gold and platinum transferred are 93.4% and 86.1%, respectively. This phase transfer technique produced organosols of smaller particle sizes and narrower size distribution with self-assembly arrangements when compared to those prepared via the previous in situ

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Kuznetsov, Sergey, Ksenia Parhacheva, and V. Filippov. "Gold from alluvium of the Puyva region (the Subpolar Urals)." Vestnik of geosciences, no. 9 (November 28, 2022): 21–30. http://dx.doi.org/10.19110/geov.2022.9.3.

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In the Puyva region, located in the southeastern part of the Subpolar Urals, several gold-bearing placers and placer occurrences are known; however, information on gold itself is not complete enough, which makes the research relevant. The study of stream gold from the alluvium of the Khartes, Sertynya, Oika, Dorozhny, and Borovoy areas, has revealed that the gold is predominantly small; the particle shape is lamellar, thickened-lumpy, and complex. Gold roundness is medium; the portion of unrounded and well-rounded particles is insignificant. Silver is almost always present in gold, copper is l

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Wada, Yuuko, Toshikazu Hamasaki, and Peter Satir. "Evidence for a Novel Affinity Mechanism of Motor-assisted Transport Along Microtubules." Molecular Biology of the Cell 11, no. 1 (2000): 161–69. http://dx.doi.org/10.1091/mbc.11.1.161.

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In microtubule (MT) translocation assays, using colloidal gold particles coupled to monoclonal tubulin antibodies to mark positions along MTs, we found that relative motion is possible between the gold particle and an MT, gliding on dynein or kinesin. Such motion evidently occurred by an affinity release and rebinding mechanism that did not require motor activity on the particle. As the MTs moved, particles drifted to the trailing edge of the MT and then were released. Sometimes the particles transferred from one MT to another, moving orthogonally. Although motion of the particles was uniforml

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Safronov, P. P., N. V. Moiseenko, and I. V. Kuznetsova. "Nano-Gold and Film-Globular Nanostructures in Samples of Native Gold Deposit Pioneer (Amur Region, Russia)." Georesources 27, no. 1 (2025): 162–77. https://doi.org/10.18599/grs.2025.1.9.

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The study of native gold from several ore zones of the Pioneer field (Amur). In the samples found: nano-gold of various morphology, varying size and composition, as well as complex micro- and nanostructures (film, film layered rhythmic, globular, fine disperse, etc.). In clay-micaceous mineral phases associated with native gold, an isometric and spheroidal nanogold visible under an electron microscope with particle sizes ~ 30–600 nm and a composition of both pure gold (sample 1000 %) and silver impurities (sample ~ 980 %). In the matrix of the same mineral phases, an invisible ultra-thin nanog

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Ackerley, C. A., L. E. Becker, A. Tilups, J. T. Rutka, and J. F. Mancuso. "CCD cameras facilitate the imaging of small gold particles in immunogold-labelled ultrathin cryosections." Proceedings, annual meeting, Electron Microscopy Society of America 54 (August 11, 1996): 904–5. http://dx.doi.org/10.1017/s0424820100166981.

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Immunogold labelled ultrathin cryosections have proven themselves invaluable in subcellular localizations of many epitopes. As there are no embeddents to block an antibody‘s access to an epitope beyond physical size or chemical alteration by primary fixation, immunogold labelling density is increased dramatically with smaller (>5nm) gold-ligand complexes. Takizawa and Robinson have elegantly demonstrated penetrations in excess of 1μm using 1.4nm gold-Fab conjugates, while 5nm IgG gold particles only partially penetrated the surface and l0nm IgG gold particles labelled the surface. In order

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