Journal articles: 'Monodispers'

1

Boutevin, Bernard, Messaoud Chaib, and Jean-Jacques Robin. "Synthesis of monodispers macromolecular diisocyanate." Polymer Bulletin 26, no. 2 (1991): 177–79. http://dx.doi.org/10.1007/bf00297523.

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Bi, Shu Xian, and Xiao Liang Zhang. "Nanomagnetic Particle Anchored to Monodispers Porous Microspheres for Pectinase Immobilization." Advanced Materials Research 1088 (February 2015): 38–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1088.38.

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The idea of preparing the surface of chitosan layer pre-absorbed on the monodispers porous microsphere via layer by layer approach receives special relevance in enzyme technology. Moreover, the colloidal stability is not impeded by the adsorbed proteins despite the fact that up to 390.2 mg of enzyme adsorbed per gram of the carrier particles. Maximum relative activity was observed at 50 °C and pH 3.5. The activity half lives for native and bound states of enzyme were found as 14.27 d and 31.05 d, respectively. These particles, premodified with the layer of magnetic nanoparticles to impart the magnetic property, were repeatedly used as catalysts following their rapid and easy separation.

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Bruijnzeel, P. L. B. "Farmacokinetiek van geïnhaleerd monodispers beclometason als functie van de deeltjesgrootte." Medisch-Farmaceutische Mededelingen 46, no. 6 (June 2008): 101–2. http://dx.doi.org/10.1007/bf03077028.

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Ali, Nisar, Baoliang Zhang, Hepeng Zhang, Wajed Zaman, Sarmad Ali, Zafar Ali, Wei Li, and Qiuyu Zhang. "Monodispers and Multifunctional Magnetic Composite Core Shell Microspheres for Demulsification Applications." Journal of the Chinese Chemical Society 62, no. 8 (August 2015): 695–702. http://dx.doi.org/10.1002/jccs.201500151.

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Agustina, Agustina, Munawarah Munawarah, Stefanus Agustinus Lumi, and Syamsu Nur. "Green Synthesis Nanopartikel Perak (Agnps) Terkonjugasi Etil Parametoksi Sinamat (Epms) sebagai Bahan Tabir Surya." Jurnal Farmasi Galenika (Galenika Journal of Pharmacy) (e-Journal) 4, no. 2 (October 20, 2018): 98–105. http://dx.doi.org/10.22487/j24428744.2018.v4.i2.10440.

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Green Synthesis is a method to make silver nanoparticles (AgNPs) by utilizing natural materials as bioreductors. One of the natural materials that can reduce metal ions is Kaempferia galanga rhizome because it has a chemical component that can penetrate the metal. The compounds are ethyl paramethoxycinnamate (EPMC) which is used as sunscreen. This study aims to produce AgNPs conjugated with EPMC that can be used as raw material sunscreen. This study was conducted by extracting EPMS from the Kaempferia galanga rhizome and synthesizing the AgNPs conjugated with EPMC. The synthesis results were characterized by UV-Vis Spectrophotometry, FTIR, SEM, PSA and sunscreen activity. Extracted result was obtained crystalline is ethyl paramethoxycinnamate compound with yield 2,3%. The characterization of EPMC with UV-Vis spectrophotometer was obtained maximum wavelength of 308 nm and FTIR analysis result at wave number 1701,27 cm-1 indicated the presence of carbonyl group (C = O) and 1165,97 cm-1 presence of C-O and showed specific characteristic from EPMS. Characterization of AgNPs using Uv-Vis spectrophotometer was obtained maximum wavelength of 469 nm. Characterization of AgNPs using SEM are spherical and monodispers forms. Then, particle size using PSA obtained an average diameter of 182 nm. AgNPs conjugated with EPMS has a sunscreen activity with sunblock category and successfully provide protection against UV exposure at low concentration (200 ppm) categorized as ultra protection with SPF value 36,4.

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Sun, Li, Fu Tian Liu, Qi Hui Jiang, Xiu Xiu Chen, and Ping Yang. "Monodisperse Fe₃O₄/Fe Core/Shell Nanoparticles with Enhanced Magnetic Property." Advanced Materials Research 306-307 (August 2011): 410–15. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.410.

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Core/shell type nanoparticles with an average diameter of 20nm were synthesized by chemical precipitation method. Firstly, Monodisperse Fe3O4 nanoparticles were synthesized by solvethermal method. FeSO47H2O and NaBH4 were respectively dissolved in distilled water, then moderated Fe3O4 particles and surfactant(PVP) were ultrasonic dispersed into the FeSO47H2O solution. The resulting solution was stirred 2 h at room temperature. Fe could be deposited on the surface of monodispersed Fe3O4 nanoparticles to form core-shell particles. The particles were characterized by using various experimental techniques, such as transmission electron microscopy (TEM), X-ray diffraction (XRD), AGM and DTA. The results suggest that the saturation magnetization of the nanocomposites is 100 emu/g. The composition of the samples show monodisperse and the sides of the core/shell nanoparticles are 20-30nm. It is noted that the formation of Fe3O4/Fe nanocomposites magnetite nanoparticles possess superparamagnetic property.

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Kim, Jong Ung, Jeong A. Lee, Beyong Hwan Ryu, Ki Won Jun, In Ho Kim, and Young Min Choi. "Synthesis and Characterization of PbSe Nanocrystals by a Microchannel Reactor." Solid State Phenomena 124-126 (June 2007): 1285–88. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.1285.

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The synthesis of high-quality monodispersed nanocrystal is very important. Typical synthetic method is rapid nucleation by injection of an organometallic precursor into a solvent maintaining the reaction temperature. Since these methods are discontinuous processes, they are not efficient for large-scale production of monodisperse nanocrystals. In this study, continuous microchannel reaction technique is presented for synthesis of monodisperse lead selenide nanocrystals in a diphenyl ether as high-temperature organic media. The microchannel reactor was used due to its possibility of continuous process and reproducibility of narrow size distribution in nanocrystal synthesis. The synthesis was carried out in microchannel reactor (800 μm diameter) made from PTFE. Lead oleate and TOP-Se were used as organic precursor and diphenyl ether as high-temperature organic solvents. Lead selenide particles with a size of less than 10nm could be continuously prepared by this method. The nanocrystals have been characterized by X-ray diffraction, TEM and optical absorption spectrometer.

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Aghababazadeh, R., S. Tabatabae, Ali Shokuhfar, and A. R. Mirhabibi. "Synthesis and Characterization of Silica Nanoparticles." Solid State Phenomena 121-123 (March 2007): 49–52. http://dx.doi.org/10.4028/www.scientific.net/ssp.121-123.49.

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Currently there are several models discussed to describe the formation of monodispersed silica particles. Monodisperse colloidal silica was prepared from tetraethoxysilane in mixture of ammonia, water and ethanol. Chemical system reaction permits the controlled growth of silica nanoparticles and subsequent condition of silicic acid in alcoholic solution. The molar ratio of NH4OH, C2H5OH and H2O has a significant effect on particle size and specific surface area of silica particles. The nature of particles was evaluated using X-ray diffraction, energy dispersive spectroscopy (EDS) and BET. The morphology of particles were determined by scanning electron microscopy (SEM) and transmission electron microscopy(TEM).

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CHOI, HYOUNG J., YUN H. CHO, MIN S. CHO, and MYUNG S. JHON. "ELECTRORHEOLOGY OF POLYANILINE-COATED POLY(METHYLMETHACRYLATE) MICROSPHERE SUSPENSIONS IN SILICONE OIL." International Journal of Modern Physics B 16, no. 17n18 (July 20, 2002): 2507–13. http://dx.doi.org/10.1142/s021797920201258x.

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Electrorheological (ER) suspensions containing spherical-monodispersed polymer particles in silicone oil were investigated. The core was poly(methylmethacrylate) (PMMA), obtained by dispersion polymerization method, and the shell, coated on monodisperse PMMA particles, was polyaniline(PA) prepared by in-situ polymerization of aniline in aqueous acidic medium. Both steady shear and dynamic tests were conducted under various electric field strength and particle concentrations in order to study flow and viscoelastic properties of the PAPMMA based ER fluids. Dielectric spectra of the ER fluids obtained were found to given a clue both to analyze their electrical polarization properties and to interpret flow behavior of the PAPMMA ER fluids.

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Watcharenwong, Apichon, Yotsapon Bailuang, and Puangrat Kajitvichyanukul. "Synthesis and Characterization of Monodisperse Magnetite Nanoparticles by Hydrothermal Method." Key Engineering Materials 737 (June 2017): 367–72. http://dx.doi.org/10.4028/www.scientific.net/kem.737.367.

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Monodisperse nanoparticles are materials that are not agglomerate. The good characteristic of these materials is the dispersity in water, so they can better react with target pollutants. Accordingly, in this work, the monodisperse magnetite nanoparticles with the superparamagnetic property were synthesized and characterized. The hydrothermal method with the iron compound and polymer as precursors was conducted. The magnetic nanoparticles were characterized by several techniques including X-ray diffraction, field emission scanning electron microscope, transmission electron microscope, and vibrating sample magnetometer. The saturation magnetization (Ms) value, the coercivity (Hc), and the retentivity (Mr) were measured to demonstrate the paramagnetic behavior of the monodisperse magnetite nanoparticles. The results showed that the Fe3O4 nanoparticle were obtained at 200 °C for 16 h. The particles are monodispersed with the size approximately in the range of 60 - 250 nm as confirmed by FE-SEM and TEM images. These are the single grain and had the spherical shape similar to a blackberry. The saturation magnetization of 17.287 emu/g and ratio of retentivity to saturation magnetization (Mr/Ms) characterized the squareness of the hysteresis loops was 0.03653. It can be indicated that the Fe3O4 nanoparticles had superparamagnetic behavior. This property of Fe3O4 nanoparticles can draw pollutants to absorb on the surface of these nanomaterials. Then adsorbed pollutants can be easily removed by separating the Fe3O4 materials from water. This technique can be applied further in water treatment and pollutant removal.

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Cha, Hyun Gil, Young Hwan Kim, Chang Woo Kim, Don Keun Lee, Sung Doo Moon, Hae Woong Kwon, and Young Soo Kang. "Synthesis of α-Fe Nanoparticles by Solventless Thermal Decomposition." Journal of Nanoscience and Nanotechnology 6, no. 11 (November 1, 2006): 3412–16. http://dx.doi.org/10.1166/jnn.2006.17951.

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A new preparation for highly crystalline and monodisperse Fe3O4 nanoparticle is reported. This synthesis requires the use of rather complicated procedures including delicate control of surfactants ratios and inert reaction conditions due to the toxic and unstable nature of the precursors none the less because thermal decomposition methods were tried to synthesize monodispersed inorganic nanocrystallites until very recently. The synthesis of Fe3O4 nanocrystallites by using Fe+2-oleate2 complex was studied. The Fe+2-oleate2 complex was prepared from the reaction of iron chloride and sodium oleate in water. The thermal decomposition of the complex at the reduced pressure (0.3 torr) and about 300° was done without any solvent. We demonstrated that a new solventless synthesis of size- and shape-monodisperse Fe3O4 nanoparticles depends on the amount of Na-oleate. And it is possible to remove the oleate ligand using reduction process. We confirmed that the nanoparticles changed from Fe3O4 to α-Fe phase obtained higher magnetic properties and crystallites by a vibrating sample magnetometer (VSM) and x-ray powder diffraction (XRD). Removal of the organic surfactant and other volatile components surrounding Fe3O4 nanoparticles was detected by fourier transform infrared spectroscopy (FT-IR).

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Zhang, He, Jun Fang Wei, and Fang Zhu. "Preparation of Large Monodispersed Spherical Silica Particles Using Stöber Method." Advanced Materials Research 647 (January 2013): 722–25. http://dx.doi.org/10.4028/www.scientific.net/amr.647.722.

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To obtain large-sized, monodispersed spherical particles of silica by Sol-Gel, the classic Stöber method was optimized. Effects of the type of solvents，reaction temperature and reaction time on the particle sizes and the particle diameter distribution of silicon dioxide were investigated by scanning electron microscopy (SEM). The results show that the monodisperse silicon dioxide spherical particles with 1.0μm diameter could be obtained in isopropanol solvent under a suitable reaction condition. When the reaction temperature is increased, the silica particle size will decrease. The particle sizes increase first and decrease later as the reaction time passing. The addition method of TEOS has great effects on the morphology and size of silicon dioxide spherical particles.

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13

Sugimoto, Tadao. "Preparation and Characterization of Monodispersed Colloidal Particles." MRS Bulletin 14, no. 12 (December 1989): 23–28. http://dx.doi.org/10.1557/s0883769400060929.

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Recently the science and technology of fine particles have been greatly advanced to meet the urgent demands of modern industries for specific and sophisticated functions for various materials, including catalysts, sensors, electromagnetic devices, and photosensitive materials. Monodispersed colloidal Systems are invaluable for this purpose because the entire system's uniform physicochemical properties directly reflect the properties of each constituent particle. Procedures for modifying monodispersed particles have progressed remarkably in recent years so that specific characteristics can be achieved. This article focuses on the backgrounds of science and technology for controlling the properties of inorganic monodispersed particles and on new developments in this field.Colloidal particles are normally formed through a sequential process of nucleation and growth of the nuclei. To obtain a monodisperse System, the two stages must be strictly separated and nucleation avoided during the growth period. Since the steady concentration of monomers in the growth stage is determined by the balance between the rates of generation of monomers and their consumption by particle growth, the generation or introduction rate of monomers must be controlled so that it is low enough to keep the balanced monomer concentration below the critical supersaturation after the nucleation period. Typically, the initial concentrations of metal sait, pH, and temperature are adjusted to meet this requirement for the formation of monodispersed metal hydrous oxide particles by forced hydrolysis of metal ions.An artificial separation between nucleation and growth processes may be achieved by “seeding,” in which foreign particles are introduced into the solution of monomers below the critical supersaturation. One may also lower the pH in hydrolysis of metal ions, dilute with solvent, add chelating agents, or suddenly change the temperature just after limited nucleation. All these procedures could cause the monomer concentration above the critical supersaturation to plunge to a level below it.

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Promkotra, Sarunya, and Tawiwan Kangsadan. "Dynamic Correlation Function of Monodispersed Colloid." Applied Mechanics and Materials 446-447 (November 2013): 176–80. http://dx.doi.org/10.4028/www.scientific.net/amm.446-447.176.

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Diffusive behaviors for two-dimensional (2D) monodispersed polystyrene array of droplet spreading by either methanol or ethanol suspension are observed on a rigid surface. Methanol solution can spread speedily on the glass surface because of the positive spreading coefficient. Conversely, the ethanol will not easily proliferate out. Monodisperse polystyrene particles are involved in Brownian motion in a thick layer during alcohol evaporation. A monolayer dimension of the drop has been developed at the final spreading. Lateral capillary forces are produced and caused the aggregation of particles. Evaporation at the edge of the ethanol film did not lead to the film to retract. The formation of 2D array, which preceded the spreading of the microscopic droplet across the surface, is able to indicate the dense structure to the dynamic correlation function.

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Zhang, J. H., P. Zhan, Z. L. Wang, W. Y. Zhang, and N. B. Ming. "Preparation of monodisperse silica particles with controllable size and shape." Journal of Materials Research 18, no. 3 (March 2003): 649–53. http://dx.doi.org/10.1557/jmr.2003.0085.

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The effects of dilution of tetraethyl orthosilicate (TEOS) with ethanol on the shape and monodispersity of silica particles were investigated. The results indicated that the dilution of TEOS with ethanol can depress the formation of new nuclei and the aggregation or adhesion of particles and make the distillation of TEOS unnecessary to achieve monodispersed silica spheres. A seeded growth technique using continuous drop addition of TEOS diluted with 4× volume of ethanol was developed to improve monodispersity and spheric shape and increase the size of silica particles. The monodisperse silica particles (150 nm ± 5%−1.2 μm ± 1%) with fine spheric shape were successfully synthesized by the seeded growth technique. Using the homemade 280 nm ± 2.8% silica spheres, we prepared opals of high quality which showed periodically ordered packing and a photonic band-gap effect.

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Li, Bo, Jin Qing Wang, Rei Fujiwara, Makoto Kuwabara, Ming Fu, and Ji Zhou. "Fabrication of Barium Titanate Inverse Opals by Sol-Gel Electrophoretic Deposition Process." Key Engineering Materials 434-435 (March 2010): 247–52. http://dx.doi.org/10.4028/www.scientific.net/kem.434-435.247.

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Barium titanate (BTO) inverse opal photonic crystals were fabricated by a process of self-assembly of polystyrene opal template in combination with electrophoretic deposition (EPD) of nanoparticles from BTO suspension. In this process, stable monodispersed suspension of BTO nanoparticles was prepared by dispersing BTO gel into a mixed solvent of 2-methoxyethanol and acethylacetone. Then the BTO nanoparticles were infilled into the interstices of the opal template formed by monodisperse polystyrene microspheres by electrophoretic deposition, and then polystyrene template was removed by calcining the specimen at a final temperature of 500oC. SEM images show that the inverse opals possess face-centered cubic (fcc) structure with center to center distant of the air spheres 310 nm. A photonic bandgap in the visible range is observed from reflection spectra of the sample. Such BTO inverse opals as photonic crystals should be useful in device applications.

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Ullah, Najeeb, Hina Andaleeb, Celestin Nzanzu Mudogo, Sven Falke, Christian Betzel, and Carsten Wrenger. "Solution Structures and Dynamic Assembly of the 24-Meric Plasmodial Pdx1–Pdx2 Complex." International Journal of Molecular Sciences 21, no. 17 (August 19, 2020): 5971. http://dx.doi.org/10.3390/ijms21175971.

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Plasmodium species are protozoan parasites causing the deadly malaria disease. They have developed effective resistance mechanisms against most antimalarial medication, causing an urgent need to identify new antimalarial drug targets. Ideally, new drugs would be generated to specifically target the parasite with minimal or no toxicity to humans, requiring these drug targets to be distinctly different from the host’s metabolic processes or even absent in the host. In this context, the essential presence of vitamin B6 biosynthesis enzymes in Plasmodium, the pyridoxal phosphate (PLP) biosynthesis enzyme complex, and its absence in humans is recognized as a potential drug target. To characterize the PLP enzyme complex in terms of initial drug discovery investigations, we performed structural analysis of the Plasmodium vivax PLP synthase domain (Pdx1), glutaminase domain (Pdx2), and Pdx1–Pdx2 (Pdx) complex (PLP synthase complex) by utilizing complementary bioanalytical techniques, such as dynamic light scattering (DLS), X-ray solution scattering (SAXS), and electron microscopy (EM). Our investigations revealed a dodecameric Pdx1 and a monodispersed Pdx complex. Pdx2 was identified in monomeric and in different oligomeric states in solution. Interestingly, mixing oligomeric and polydisperse Pdx2 with dodecameric monodisperse Pdx1 resulted in a monodispersed Pdx complex. SAXS measurements revealed the low-resolution dodecameric structure of Pdx1, different oligomeric structures for Pdx2, and a ring-shaped dodecameric Pdx1 decorated with Pdx2, forming a heteromeric 24-meric Pdx complex.

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Haji Jumali, Mohammad Hafizuddin, Razinah Rahmat Noor, Muhammad Yahaya, Muhamad Mat Salleh, and Akrajas Ali Umar. "Synthesis of Monodisperse CdSe QDs Using Controlled Growth Temperatures." Advanced Materials Research 364 (October 2011): 485–88. http://dx.doi.org/10.4028/www.scientific.net/amr.364.485.

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This paper reports on the effect of growth temperatures on optical properties of monodisperse CdSe QDs synthesized via wet chemical method. The growth temperature was varied from 260 – 310 °C while growth period was fixed at 60 s. The resulting colloidal was in strong quantum confinement regime and having yield as high as 53%. As the growth temperature increased, the monodispersed CdSe QDs with diameter in the range of 3-7 nm were obtained. Both absorption and PL spectra of the QDs revealed a strong red-shift with the increment of growth temperature. Thus, the size of QDs was enlarged with increment of the wavelength from both the spectra. Consequently, the energy gap of resulting QDs can be tuned by tuning the size of QDs. More importantly, the narrow widths of the PL emissions with different colors make these colloidal to be a potential candidate for different optical and optoelectronic devices.

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19

Iswara, Mochammad Agung Indra, Tantular Nurtono, and Sugeng Winardi. "Studi Fluidisasi dan Pembakaran Batubara Polydisperse di Dalam Fluidized Bed Berbasis Simulasi CFD (Computational Fluid Dynamic)." Jurnal Teknik Kimia dan Lingkungan 2, no. 1 (April 30, 2018): 40. http://dx.doi.org/10.33795/jtkl.v2i1.62.

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Penelitian ini bertujuan untuk mengetahui fenomena pembakaran batubara dimana dimensi alat, distribusi ukuran partikel, dan jenis kualitas batubara menggunakan validasi dari penelitian Wang. Penelitian ini mengarahkan pada simulasi berbasis CFD. Kondisi operasi pada saat simulasi pembakaran dilakukan pada kecepatan bubbling. Metode yang digunakan sebelum melakukan simulasi pembakaran merupakan kelanjutan dari simulasi fluidisasi dimana masih menggunakan geometri 2-D fluidized bed lalu dilakukan meshing, selanjutnya memasukkan persamaan energi. Geometri fluidized bed yang digunakan berbentuk tabung dengan panjang silinder fluidized bed 1370 mm, diameter silinder 152 mm. Bahan yang digunakan pada penelitian ini berupa pulverized coal dengan jenis batubara Bituminous dimana ukuran partikel dianggap polydisperse dengan ukuran partikel 1 mm dan 1,86mm yang masing-masing sebesar 50% fraksi massa dengan kecepatan 0,2 Kg/s dan suhu 1200 K, dan udara luar yang diinjeksikan dengan kecepatan 0,8 m/s dan suhu 300 K. Analisa pengambilan data adalah berupa kontur fase padatan, kontur temperatur pada fase-1 dan fase padatan, fraksi massa produk pembakaran, massa padatan awal dan akhir simulasi dengan time step sebesar 0,0001 detik dan number of time step sebesar 300000. Selanjutnya data tersebut diplot menjadi grafik temperatur terhadap time step dan disajikan dalam setiap 1 menit simulasi selama 5 menit simulasi.This research aims to determine coal combustion’s phenomenon, where the device’s dimension, particle size distribution, and the quality of rank coal which validated Wang’s reseach. This reseach leads on CFD simulation. The operation condition has did in bubbling velocity. This method is a continuation from fluidization simulation which is use 2-D Geometry and then used the meshing method, and enter the energy equation. The geometry of fluidized bed used was tubular cylinder with 1370 mm length and 152 mm. Materials used in this study was pulverized coal with Bituminous coal type which the particle size was considered as monodispers with particle size was 1.43 mm and polydispersed with particle size was 1 mm with 50% mass fraction and 1.86 mm with 50% mass fraction with flow rate 0,2 Kg/s and the temperature is 1200 K, and the outside air are injected in 0,8 m/s and 300 K. The analysis of data retrieval is solid phase contour, temperature contours in phase-1 and solid phase, mass fraction of combustion product, initial solid mass and final solid mass simulation with time step 0,0001 s and the numberof time step 300000. Then the data is plotted into a graph temperature vs time step and presented in 1 minute simulation for 5 minute simulation.

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Zuilhof, H., G. Pilzak, B. van Lagen, C. Hendrikx, and E. Sudhölter. "Monodisperse Oligodiacetylenes." Synfacts 2008, no. 11 (October 23, 2008): 1164. http://dx.doi.org/10.1055/s-0028-1083473.

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Ferguson, J. R., and D. E. Stock. "“Heavy” Particle Dispersion Measurements With Mono- and Polydisperse Particle Size Distributions." Journal of Fluids Engineering 115, no. 3 (September 1, 1993): 523–26. http://dx.doi.org/10.1115/1.2910170.

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A method is presented to estimate the effects of a polydisperse particle size distribution on the measured turbulent dispersion of particles. In addition, the analysis provides a means to estimate the standard deviation of the size distribution for which a class of particles may be considered monodisperse. If monodisperse particles are unavailable because of practical considerations (e.g., the required standard deviation of particle size is too small to obtain a sufficient quantity) then the method provides a means to correct the data of near monodisperse size distributions to reflect the dispersion of monodisperse particles.

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Yu, Zeqiong, Shaowei Bo, Huiyuan Wang, Yu Li, Zhigang Yang, Yongzhuo Huang, and Zhong-Xing Jiang. "Application of Monodisperse PEGs in Pharmaceutics: Monodisperse Polidocanols." Molecular Pharmaceutics 14, no. 10 (August 31, 2017): 3473–79. http://dx.doi.org/10.1021/acs.molpharmaceut.7b00496.

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Hu, Zejian, Shengji Li, Fan Yang, Xunjie Lin, Sunqiang Pan, Xuefeng Huang, and Jiangrong Xu. "Formation and Elimination of Satellite Droplets during Monodisperse Droplet Generation by Using Piezoelectric Method." Micromachines 12, no. 8 (July 31, 2021): 921. http://dx.doi.org/10.3390/mi12080921.

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One of the key questions in the generation of monodisperse droplets is how to eliminate satellite droplets. This paper investigates the formation and elimination of satellite droplets during the generation of monodisperse deionized water droplets based on a piezoelectric method. We estimated the effects of two crucial parameters—the pulse frequency for driving the piezoelectric transducer (PZT) tube and the volume flow rate of the pumping liquid—on the generation of monodisperse droplets of the expected size. It was found that by adjusting the pulse frequency to harmonize with the volume flow rate, the satellite droplets can be eliminated through their coalescence with the subsequent mother droplets. An increase in the tuning pulse frequency led to a decrease in the size of the monodisperse droplets generated. Among three optimum conditions (OCs) (OC1: 20 mL/h, 20 kHz; OC2: 30 mL/h, 30 kHz; and OC3: 40 mL/h, 40 kHz), the sizes of the generated monodisperse deionized water droplets followed a bimodal distribution in OC1 and OC2, whereas they followed a Gaussian distribution in OC3. The average diameters were 87.8 μm (OC1), 85.9 μm (OC2), and 84.8 μm (OC3), which were 8.46%, 6.14%, and 4.69% greater than the theoretical one (81.0 μm), respectively. This monodisperse droplet generation technology is a promising step in the production of monodisperse aerosols for engineering applications.

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Pham, Xuan-Hung, San Kyeong, Jaein Jang, Hyung-Mo Kim, Jaehi Kim, Seunho Jung, Yoon-Sik Lee, Bong-Hyun Jun, and Woo-Jae Chung. "Facile Method for Preparation of Silica Coated Monodisperse Superparamagnetic Microspheres." Journal of Nanomaterials 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/1730403.

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This paper presents a facile method for preparation of silica coated monodisperse superparamagnetic microsphere. Herein, monodisperse porous polystyrene-divinylbenzene microbeads were prepared by seeded emulsion polymerization and subsequently sulfonated with acetic acid/H2SO4. The as-prepared sulfonated macroporous beads were magnetized in presence of Fe2+/Fe3+under alkaline condition and were subjected to silica coating by sol-gel process, providing water compatibility, easily modifiable surface form, and chemical stability. FE-SEM, TEM, FT-IR, and TGA were employed to characterize the silica coated monodisperse magnetic beads (~7.5 μm). The proposed monodisperse magnetic beads can be used as mobile solid phase particles candidate for protein and DNA separation.

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Li, Chao, Li Han, Hongwei Ma, Heyu Shen, Lincan Yang, Pibo Liu, Xinyu Hao, and Yang Li. "Synthesis of monodisperse isomeric oligomers based on meta-/para- and linear/star-monomer precursors with Ugi–hydrosilylation orthogonal cycles." Polymer Chemistry 10, no. 22 (2019): 2758–63. http://dx.doi.org/10.1039/c9py00307j.

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Thakare, Dhawal R., Grayson Schaer, Mostafa Yourdkhani, and Nancy R. Sottos. "Fabrication of pH-responsive monodisperse microcapsules using interfacial tension of immiscible phases." Soft Matter 16, no. 22 (2020): 5139–47. http://dx.doi.org/10.1039/d0sm00301h.

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Monodisperse stimuli-responsive microcapsules are difficult to fabricate with precise control over capsule properties. The paper reports a facile technique to produce highly tunable and monodisperse emulsion-templated acid-responsive microcapsules.

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Bukharov, A. V., A. F. Ginevsky, and E. V. Vishnevsky. "NUMERICAL SIMULATION OF COOLING JET FROM HYDROGEN AND DEUTERIUM AS APPLICABLE TO INSTALLATIONS ON RECEIVING CRYOGENIC MONODISPERSE TARGETS." Herald of Dagestan State Technical University. Technical Sciences 46, no. 1 (July 16, 2019): 8–18. http://dx.doi.org/10.21822/2073-6185-2019-46-1-8-18.

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Objectives. Development of a model and carrying out numerical calculations for the cooling of thin jets of Hydrogen and Deuterium as applicable to installations on receiving cryogenic monodisperse targets.Methods. To achieve this purpose, the model of cryogenic jet outflow into the low pressure area was created and using PHOENICS software the temperature change of the surface and the interior of a jet over time for various external parameters is investigated through the numerical method.Result. The dependences of temperature changes of liquid Hydrogen and Deuterium jets along the jet surface and along the radius depending on the jet diameter, speed, initial jet temperature and pressure in the working chamber of installations for receiving cryogenic monodisperse targets were carried out.Conclusion. The principal possibility of creating high-speed cryogenic monodisperse targets is shown. According to the calculations, at input of thin liquid jets of Hydrogen or Deuterium with a speed up to 100 m/s into the working chamber with low pressure, jets at a distance of up to 1 mm do not have time to freeze and can be broken into monodisperse drops. Drops are cooled due to evaporation and become granules. The developed model, the program for determination of parameters of steady monodisperse disintegration of liquid cryogenic streams and results of numerical calculations can be used during creation of units for receiving high-speed cryogenic monodisperse targets.

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Lee, Ki Chang, and Hun Seung Choo. "Monodispersepoly[BMA-co-(COPS-I)] Particles by Soap-Free Emulsion Copolymerization and Its Optical Properties as Photonic Crystals." Journal of Nanoscience and Nanotechnology 15, no. 10 (October 1, 2015): 7671–78. http://dx.doi.org/10.1166/jnn.2015.11172.

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In order to study the surfactant-free emulsion copolymerization of benzyl methacrylate (BMA) with sodium 1-allyloxy-2-hydroxypropane sulfonate (COPS-I) and the resulting optical properties, a series of experiments was carried out at various reaction conditions such as the changes of BMA concentration, COPS-I concentration, BMA concentration under a fixed COPS-I amount, initiator and divinyl benzene (DVB) concentration. All the latices showed highly monodispersed spherical particles in the size range of 144∼435 nm and the respective shiny structural colors from their colloidal photonic crystals. It is found that the changes in such polymerization factors greatly affect the number of particles and particle diameter, polymerization rate, molecular weight, zeta-potential, and refractive indices. The increase of number of particles led to the increased rate of polymerization and zeta-potential of the latices, on the other hand, to the decreased molecular weight. Refractive indices and the reflectivity increased with COPS-I concentration, on the other hand, and decreased with DVB concentration. Especially, refractive indices of the resulting poly[BMA-co-(COPS-I)] colloidal photonic crystals showed much higher values of 1.65∼2.21 than that of polystyrene, due to the formation of core–shell shaped morphology. Monodisperse and high refractive index of poly[BMA-co-(COPS-I)] particles prepared in this work could be used for the study in photonic crystals and electrophoretic display.

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Radzilowski, L. H., J. L. Wu, and S. I. Stupp. "Monodisperse "rodcoil" copolymers." Macromolecules 26, no. 4 (July 1993): 879–82. http://dx.doi.org/10.1021/ma00056a053.

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Si, Shufeng, Chunhui Li, Xun Wang, Dapeng Yu, Qing Peng, and Yadong Li. "Magnetic Monodisperse Fe3O4Nanoparticles." Crystal Growth & Design 5, no. 2 (March 2005): 391–93. http://dx.doi.org/10.1021/cg0497905.

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Bibette, J. "Monodisperse ferrofluid emulsions." Journal of Magnetism and Magnetic Materials 122, no. 1-3 (April 1993): 37–41. http://dx.doi.org/10.1016/0304-8853(93)91034-5.

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Lee, Dong Kwon, Sung Il Park, Jong K. Lee, and Nong Moon Hwang. "A Theoretical Model for Digestive Ripening." Materials Science Forum 561-565 (October 2007): 2279–82. http://dx.doi.org/10.4028/www.scientific.net/msf.561-565.2279.

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Recently, gram quantities of monodisperse gold or silver nanoparticles were reported to be produced through a digestive ripening process, in which colloidal particles of size 2 to 40 nm are transformed to nearly monodisperse particles of 4 ~ 5 nm diameter. Digestive ripening, an example for an inverse Ostwald ripening process, is a puzzling phenomenon since it appears to go against the usual capillary effect, i.e., reduction of interfacial free energy. A theoretical model is presented, which accounts for the monodisperse state of such nanoparticles by considering the effect of charges on the particles and thus electrostatic energy during particle size evolution.

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Umstätter, Philipp, and Herbert M. Urbassek. "Fragmentation and energy dissipation in collisions of polydisperse granular clusters." Astronomy & Astrophysics 633 (January 2020): A24. http://dx.doi.org/10.1051/0004-6361/201936527.

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Context. Dust aggregates consist of polydisperse grains following a power-law size distribution with an exponent of around 2.5, called the Mathis-Rumpl-Nordsieck (MRN) distribution. Aims. We compare the outcome of collisions between polydisperse granular aggregates with those of monodisperse aggregates. Methods. Granular-mechanics simulations were used to study aggregate collisions. Results. Both with respect to the fragmentation threshold and to energy dissipation, MRN aggregates behave as monodisperse aggregates if their size corresponds approximately to the geometric mean of the largest and smallest radius of the MRN distribution. Conclusions. Our results allow the polydisperse aggregates to be substituted with monodisperse aggregates, which are easier to simulate.

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Mao, Jialin, Wei Zhang, Stephen ZD Cheng, and Chrys Wesdemiotis. "Analysis of monodisperse, sequence-defined, and POSS-functionalized polyester copolymers by MALDI tandem mass spectrometry." European Journal of Mass Spectrometry 25, no. 1 (February 2019): 164–74. http://dx.doi.org/10.1177/1469066719828875.

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Monodisperse, sequence-defined polymers can be potentially used for digital data storage. This study reports the sequence analysis and differentiation of monodisperse polyester copolymers carrying side chains functionalized in a specific order by polyhedral oligomeric silsesquioxane (POSS) nanoparticles. Steglich esterification and succinic anhydride ring-opening chemistries were utilized iteratively to synthesize the intended sequences, which were characterized by matrix-assisted laser desorption ionization tandem mass spectrometry (MALDI-MS2). Isomeric oligomers were readily distinguished based on their different fragmentation patterns. The sequences embedded in the oligomers were decrypted by their specific backbone dissociation pathways. The robustness of using MALDI-MS2 as a sequencing method for monodisperse synthetic macromolecules was assessed and validated by the characterization of longer oligomers.

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Tockstein, Antonín, and František Skopal. "Dependence of transversely scattered light flux on concentration in coarse polydisperse suspensions." Collection of Czechoslovak Chemical Communications 53, no. 12 (1988): 3014–20. http://dx.doi.org/10.1135/cccc19883014.

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The flux of light scattered by a polydisperse system at 90°, integrated along the optical path of the incident beam, exhibits an extremum in dependence on the suspension concentration, and is formally described by the same equation as holds for monodisperse systems. The coefficients in this equation are the mean values of the individual coefficients of the monodisperse components.

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Wang, Guang Hai, Ang Li, and Yue Zhang. "Preparation of Microsized Monodisperse Silica Spheres by Hydrolysis of Tetraethoxy Silane." Advanced Materials Research 105-106 (April 2010): 466–69. http://dx.doi.org/10.4028/www.scientific.net/amr.105-106.466.

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Monodispersed silica spheres have attracted much attention because of their widely applications in the areas of catalysis, adsorption, chromatography packing materials and advanced ceramics. This paper focused on its application as a packing material of function coatings for space applications. Nanosized monodispersed silica spheres can be fabricated by Stöber method. However, microsized monodispersed silica spheres are not easy obtained. In this paper monodispersed silica spheres with the size between 200nm to 2000nm were fabricated by hydrolysis of tetraethoxy silane (TEOS) in isopropyl alcohol solvent and using ammonia as catalyst through multi-step growth method. The influence of silica seed number density and TEOS concentration on monodispersity and size of silica sphere were studied. The result shows that monodispersed silica spheres could be obtained through control the concentration of TEOS and the silica seed number density during every growth step. The diameter of monodispersed silica spheres increased with the steps of growth.

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Paardekooper, Sijme-Jan, Colin P. McNally, and Francesco Lovascio. "Polydisperse streaming instability – I. Tightly coupled particles and the terminal velocity approximation." Monthly Notices of the Royal Astronomical Society 499, no. 3 (October 14, 2020): 4223–38. http://dx.doi.org/10.1093/mnras/staa3162.

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ABSTRACT We introduce a polydisperse version of the streaming instability (SI), where the dust component is treated as a continuum of sizes. We show that its behaviour is remarkably different from the monodisperse SI. We focus on tightly coupled particles in the terminal velocity approximation and show that unstable modes that grow exponentially on a dynamical time-scale exist. However, for dust to gas ratios much smaller than unity, they are confined to radial wavenumbers that are a factor $\sim 1/{\overline{\rm St}}$ larger than where the monodisperse SI growth rates peak. Here ${\overline{\rm St}}\ll 1$ is a suitable average Stokes number for the dust size distribution. For dust to gas ratios larger than unity, polydisperse modes that grow on a dynamical time-scale are found as well, similar as for the monodisperse SI and at similarly large wavenumbers. At smaller wavenumbers, where the classical monodisperse SI shows secular growth, no growing polydisperse modes are found under the terminal velocity approximation. Outside the region of validity for the terminal velocity approximation, we have found unstable epicyclic modes that grow on ∼104 dynamical time-scales.

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Sturtewagen, Luka, and Erik van der Linden. "Effects of Polydispersity on the Phase Behavior of Additive Hard Spheres in Solution." Molecules 26, no. 6 (March 11, 2021): 1543. http://dx.doi.org/10.3390/molecules26061543.

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The ability to separate enzymes, nucleic acids, cells, and viruses is an important asset in life sciences. This can be realised by using their spontaneous asymmetric partitioning over two macromolecular aqueous phases in equilibrium with one another. Such phases can already form while mixing two different types of macromolecules in water. We investigate the effect of polydispersity of the macromolecules on the two-phase formation. We study theoretically the phase behavior of a model polydisperse system: an asymmetric binary mixture of hard spheres, of which the smaller component is monodisperse and the larger component is polydisperse. The interactions are modelled in terms of the second virial coefficient and are assumed to be additive hard sphere interactions. The polydisperse component is subdivided into sub-components and has an average size ten times the size of the monodisperse component. We calculate the theoretical liquid–liquid phase separation boundary (the binodal), the critical point, and the spinodal. We vary the distribution of the polydisperse component in terms of skewness, modality, polydispersity, and number of sub-components. We compare the phase behavior of the polydisperse mixtures with their concomittant monodisperse mixtures. We find that the largest species in the larger (polydisperse) component causes the largest shift in the position of the phase boundary, critical point, and spinodal compared to the binary monodisperse binary mixtures. The polydisperse component also shows fractionation. The smaller species of the polydisperse component favor the phase enriched in the smaller component. This phase also has a higher-volume fraction compared to the monodisperse mixture.

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Sudduth, Richard D. "Optimum formulation derivation for the ultimate packing fraction using monodispersed particle sizes when optimizing suspension viscosities." Pigment & Resin Technology 48, no. 1 (January 7, 2019): 45–56. http://dx.doi.org/10.1108/prt-01-2018-0006.

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Purpose The importance of maximizing the particle packing fraction in a suspension by maximizing average particle size ratio of D5/D1 has been adequately shown to be important as previously reported in the literature. This study aims to extend that analysis to include the best formulation approach to maximize the packing fraction with a minimum number of monodisperse particle sizes. Design/methodology/approach An existing model previously developed by this author was modified theoretically to optimize the ratio used between consecutive monodisperse particle sizes. This process was found to apply to a broad range of particle configurations and applications. In addition, five different approaches for maximizing average particle size ratio D̅5/D̅1 were addressed for blending several different particle size distributions. Maximizing average particle size ratio D̅5/D̅1 has been found to result in an optimization of the packing fraction. Several new concepts were also introduced in the process of maximizing the packing fraction for these different approaches. Findings The critical part of the analysis to maximize the packing fraction with a minimum number of particles was the theoretical optimization of the ratio used between consecutive monodisperse particle sizes. This analysis was also found to be effectively independent of the maximum starting particle size. This study also clarified the recent incorrect claim in the literature that Furnas in 1931 was the first to generate the maximum theoretical packing fraction possible for n different particles that was actually originally developed in conjunction with the Sudduth generalized viscosity equation. In addition, the Furnas generated equation was also shown to give significantly different results from the Sudduth generated equation. Research limitations/implications Experimental data involving monodisperse particles of different blends with a minimum number of particle sizes that are truly monodisperse are often extremely difficult to obtain. However, the theoretical general concepts can still be applicable. Practical implications The expanded model presented in this article provides practical guidelines for blending pigments using a minimum number of monodisperse particle sizes that can yield much higher ratios of the particle size averages D̅5/D̅1 and thus potentially achieve significantly improved properties such as viscosity. Originality/value The model presented in this article provides the first apparent guidelines to control the blending of pigments in coatings by the optimization of the ratio used between consecutive monodisperse particle sizes. This analysis was also found to be effectively independent of the maximum starting particle size.

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Wang, Hong, Yan Jie, Hong Luo, and Xue Feng. "Hydrothermal Synthesis of Monodisperse α-Fe₂O₃ Nanoparticles." Advanced Materials Research 236-238 (May 2011): 1814–17. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.1814.

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Monodisperse α-Fe2O3nanoparticles with average particle size of 110 nm were successfully prepared using olyvinylpyrrolidone (PVP) as surfactant via a novel hydrothermal route. The products were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM). The experiments results revealed that PVP and the concentration of NH4HCO3have played a crucial role in the formation of the monodisperse a-Fe2O3nanoparticles.

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Zhao, Fei, Mei Yuan, Wen Zhang, and Song Gao. "Monodisperse Lanthanide Oxysulfide Nanocrystals." Journal of the American Chemical Society 128, no. 36 (September 2006): 11758–59. http://dx.doi.org/10.1021/ja0638410.

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42

Peredo-Ortíz, R., M. Hernández-Contreras, and R. Hernández Gómez. "Diffusion in monodisperse ferrofluids." Journal of Physics: Conference Series 792 (January 2017): 012099. http://dx.doi.org/10.1088/1742-6596/792/1/012099.

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43

Ugelstad, J., P. Stenstad, L. Kilaas, W. S. Prestvik, R. Herje, A. Berge, and E. Hornes. "Monodisperse Magnetic Polymer Particles." Blood Purification 11, no. 6 (1993): 349–69. http://dx.doi.org/10.1159/000170129.

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Aratani, Naoki, and Atsuhiro Osuka. "Monodisperse Giant Porphyrin Arrays." Macromolecular Rapid Communications 22, no. 10 (July 1, 2001): 725–40. http://dx.doi.org/10.1002/1521-3927(20010701)22:10<725::aid-marc725>3.0.co;2-t.

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Zha, L. S., Y. Zhang, W. L. Yang, and S. K. Fu. "Monodisperse Temperature-Sensitive Microcontainers." Advanced Materials 14, no. 15 (August 5, 2002): 1090. http://dx.doi.org/10.1002/1521-4095(20020805)14:15<1090::aid-adma1090>3.0.co;2-6.

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Chu, Liang-Yin, Andrew S Utada, Rhutesh K Shah, Jin-Woong Kim, and David A Weitz. "Controllable Monodisperse Multiple Emulsions." Angewandte Chemie 119, no. 47 (December 3, 2007): 9128–32. http://dx.doi.org/10.1002/ange.200701358.

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Chu, Liang-Yin, Andrew S Utada, Rhutesh K Shah, Jin-Woong Kim, and David A Weitz. "Controllable Monodisperse Multiple Emulsions." Angewandte Chemie International Edition 46, no. 47 (December 3, 2007): 8970–74. http://dx.doi.org/10.1002/anie.200701358.

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48

Ōsawa, Eiji. "Monodisperse single nanodiamond particulates." Pure and Applied Chemistry 80, no. 7 (January 1, 2008): 1365–79. http://dx.doi.org/10.1351/pac200880071365.

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Detonation nanodiamond (DN) was discovered in 1963, but for several reasons was known only among a small number of scientists until the turn of the century. The most serious cause was the fact that primary nanocarbon particles formed by the "bottom-up method" are in general covalently bound together under high-temperature and -pressure conditions to form large agglutinates, which were difficult to separate by conventional methods. DN was not an exception. A breakthrough led to the isolation of primary particles having the expected size of 4-5 nm by wet-milling with zirconia micro-beads. Thus, long-waited primary particles of DN finally became available in kg quantities in the form of colloidal sol, gel, and readily redispersible flakes. Progress in the development of a new form of the old material is presented.

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Cormack, Peter A. G., Barry D. Moore, and David C. Sherrington. "Monodisperse liquid crystalline peptides." Journal of Materials Chemistry 7, no. 10 (1997): 1977–83. http://dx.doi.org/10.1039/a701084b.

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Kim, Jae-Hyun, Hye Jeong Hwang, Joon Suk Oh, Stefano Sacanna, and Gi-Ra Yi. "Monodisperse Magnetic Silica Hexapods." Journal of the American Chemical Society 140, no. 29 (June 28, 2018): 9230–35. http://dx.doi.org/10.1021/jacs.8b05128.

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Journal articles on the topic 'Monodispers'

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