DOCSLIB.ORG

Microreport the Science and Technology of Small Particles™ M I C R O M E R I T I C S I N S T R U M E N T C O R P O R a T I O N Volume 18 No

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Microreport the Science and Technology of Small Particles™ M I C R O M E R I T I C S I N S T R U M E N T C O R P O R a T I O N Volume 18 No E H T microReport The Science and Technology of Small Particles™ M ICRO M ERITICS I NSTRU M ENT C ORPORATION VOLUME 18 NO. 2 In This Issue Micromeritics Proudly Announces Its Second Micromeritics Proudly Announces Its Second Instrumentation Grant Award Instrumentation Award AutoChem II 2920 Awarded Winner to the University of South Carolina .............................1 icromeritics re- Mcently launched Micromeritics Appoints New an Instrument Grant Manager of Market Program that is in- Development..................... 2 tended to provide particle characteriza- Scientific Theory Posters tion instruments to are Now Available..............3 non-profit universities and research organi- Micromeritics Extensive zations for the pur- Bibliography Surpasses pose of fostering and 25,000 Downloads supporting meritori- AutoChem II 2920 600 papers added since ous research projects. Chemisorption Analyzer January 2007.................. 3 The initial grant was awarded to the Berkeley Catalysis Center at the Pulse Chemisorption University of California-Berkeley. Dr. Alan Katz, the with AutoChem II 2920: principle investigator intends to use the instrument Isopropylamine on Zeolites (an AutoChem 2920) to determine the concentration Guest article by and acid/base characteristics of catalytic active sites Andrew D’Amico.................4 on solids in a fashion that cannot be accomplished by other techniques. In particular, this will be used What’s New at to investigate the chemisorption of H2, CO, CO2, and Micromeritics Analytical N2O, as well as reactive che- Services ............................6 misorption using hydrogen and alkanes as reductants. Also... After careful consideration of Training Courses...............7 many deserving applications, Events .............................. 7 the special Grant Selection Committee has selected the second grant award winner. An AutoChem II 2920 Cata- lyst Characterization System has been awarded to the De- partment of Chemical Engi- Dr. John Monnier neering at the University of South Carolina. Dr. John Monnier, Research Professor and Principal Investigator states, “One of the primary emphasis www.micromeritics.com areas of the University is nanotechnology, and the continued on page 2 VOL 18 NO 2 Grant Award continued efforts are being led by responsible for catalytic endar quarter. Remaining the USC Nanocenter. Na- transformations. All other grant deadline dates for noscale catalysis is a focal analytical tools measure 2007 are: point, or thrust area, of only physical and/or Application deadline the Nanocenter which chemical correlations re- 6/30/07; includes not only the tra- lated to concentrations of Grant decision prior to ditional areas of catalyst active sites.” 9/30/07 synthesis and evaluation According to Preston Hen- Application deadline for environmental and drix, Micromeritics’ Presi- 9/30/07; chemical processes, but dent, “This program is TM Grant decision prior to also the Future Fuels designed to promote and 12/31/07 initiative at USC which advance the acquisition Applications may be is heavily focused on and use of particle char- submitted at any time fuel cells and alternative acterization instrumenta- in accordance with the energy sources, of which tion not generally avail- application instructions catalysts and electrocata- able through other means and will remain active for lysts are key components. to non-profit universities a period of one year from Selective chemisorption and institutions. We are the date of submission. is the single most impor- very proud and excited to For more information, go tant analytical tool used present this award in an to www.micromeritics.com for the study and appli- ongoing grant program to and click on Grant Pro- cation of materials em- support important re- gram for a detailed grant ployed in these catalytic search.” processes, and is the only description, application A maximum of one instru- technique that directly requirements, and appli- ment/integrated system measures the concentra- cation. will be awarded per cal- tion of active surface sites eter Bouza has been of Science in Electrical Micromeritics Appoints Pnamed Manager of Engineering and is final- New Manager of Market Market Development for izing a Master of Science Micromeritics Particle in Industrial Engineering Development Size, Count, and Shape from Florida Internation- Business. al University in Miami, In his new role, Mr. Bou- Florida. za will be responsible for Mr. Bouza’s comprehen- expanding the Particle sive expertise in the area Size, Count, and Shape of particle analysis is business of Micromerit- especially relevant with ics. Micromeritics’ Saturn Peter joins Micromerit- DigiSizer High Resolution ics from Beckman-Coul- Laser Particle Size ana- ter where he worked in lyzer and recent introduc- varying roles for over 15 tion of the Elzone II Par- years in their Particle ticle Size analyzer. His Characterization Divi- knowledge and experience sion. For the past seven will be instrumental in years he has held the helping Micromeritics to Mr. Peter Bouza position of General Man- build stronger relation- ager for Global Opera- ships with the biotechnol- tions. He has a Bachelor ogy and pharmaceutical industries. 2 VOL 18 NO 2 Scientific Theory Posters are Now Available. icromeritics Instru- Mment Corporation is releasing a series of post- ers illustrating the theo- ries behind the technolo- gies of our broad line of automated particle char- acterization analytical laboratory instruments. In this series of posters, the various theories used to determine particle characteristics such as surface area, particle size, pore volume, pore size, absolute density, enve- lope density, bulk density, catalytic activity, and active surface area will be presented. These posters are now available through our on-line catalog or by calling customer support or your sales representa- The Electrical Sensing Zone Theory and the Mercury tive. Porosimetry Theory posters are currently available. Micromeritics Extensive Bibliography Referencing More Than 6,000 Scientific Papers Surpasses 25,000 Downloads his bibliography has In this series of peer-re- those papers that are Tbeen updated to in- viewed papers, various available from various clude approximately 600 particle characteristics sources on the Internet. papers referencing Mi- such as surface area, We have often been asked cromeritics instruments particle size, pore vol- for references to papers published since January. ume, pore size, absolute in which a scientist uses density, envelope density, For those interested in a Micromeritics instru- bulk density, catalytic ac- ment to study the same the physical characteris- tivity, and active surface tics of powders and solids or similar materials as area are determined for a the new user intends to for fundamental research, wide variety of materials. product development, study. This document will Each of these technical satisfy that need. It also quality assurance and papers references one or control, production, or serves as a powerful ref- more Micromeritics prod- erence resource for those process control applica- ucts. The list by no means tions, this bibliography is engaged in particle char- represents a complete and acterization. an indispensable tool. exhaustive search of the literature, but includes VOL 18 NO 2 Pulse Chemisorption with AutoChem II 2920: Isopropylamine on Zeolites Andrew D’Amico Introduction Several ZSM-5 zeolite samples were analyzed The Hoffman elimination reaction: using the AutoChem II 2920. By pulsing iso- propyl amine onto the zeolites, the concentra- NH2 H H tion of acid sites can be determined for a particu- lar zeolite. This is very C C + N important for catalytic H reactions. For example, the reaction that occurred H3C CH3 CH2 CH3 H H during these analyses proceeded through an in- termediate due to an acid- base reaction between the amine and the zeolite, fol- lowed by a specific type of E2 elimination, known as Materials: the Hoffman elimination. The samples used are listed below. Due to the second order kinetics involved in this Zeolite Type SiO / Al O reaction, a high concen- 2 2 3 tration of acid sites would ZSM-5-30 30 allow the reaction to pro- ceed much more quickly. ZSM-5-55 50 Preparation ZSM-5-80 80 While there was no prep- aration of the sample as far as degassing is concerned, it could be by heating the sample to were twenty loop injec- said that the sample was high temperature. These tions of isopropylamine ‘prepared’ by heating. The samples were ‘prepared’ occurring at four-minute ZSM-5 samples contained by first being heated to intervals. The last part various cations, including 500 °C and then cooling of the analysis involved a ammonium (NH +). These 4 back to 200 °C. temperature-programmed cations were not as desir- desorption (TPD). At this able for the analysis as Analysis step in the analysis, the the hydrogen cation (H+). The preparation part of mass spectrometer began Since samples contain- the analysis was followed scanning for propylene, the ing the hydrogen cation by the pulse chemisorp- product of interest. Data are more expensive, the tion step of the analysis. were collected during a tem- sample can be converted During this step, there perature ramp to 500 °C. to the hydrogen cation VOL 18 NO 2 0.12 0.10 Data 0.08 These graphs show how the intensity of the TCD 0.06 signal changes for various zeolite samples. Notice TCD Signal (a. u.) 0.04 that a direct proportion- ality exists between the 0.02 peak intensities and the concentration of alumi- 0.00 num oxide (Al2O3), and 100 150 200 250 300 350 400 450 500 an inverse proportionality Temperature oC exists between the peak intensity and the silica- to-aluminum oxide ratio 0.12 (SiO2/Al2O3). 0.10 Legend: 0.08 0.06 ZSM-5-30 0.04 ZSM-5-55 TCD Signal (a. u.) ZSM-5-80 0.02 0.00 240 260 280 300 320 340 Temperature oC 0.12 0.10 0.08 0.06 Attention Authors We welcome articles and informa- 0.04 tion concerning particle technol- TCD Signal (a. u.) ogy applications performed with Micromeritics instrumentation. 0.02 See the back page for further information.
Load more

Recommended publications
  • Materials Characterization in Pharma
    Materials Characterization in Pharma R&D spending in the pharmaceutical industry through 2015 Particle Size was valued at around $58bn as organisations vied to gain a competitive advantage by bringing new drugs to market Particle size is crucial to dissolution rates, bioavailability, and as quickly as possible[1]. Materials science is now helping stability and other performance factors in solid and suspension [2] pharmaceutical companies to standardize and control areas dosage forms . As part of a CQA process, it’s vital for such as drug form and manufacture to deliver new products manufacturers to explore how particle size affects performance. more quickly and with greater quality. The pharma industry The Micromeritics NanoPlus HD DLS uses dynamic light is increasingly embracing the principles of Quality by Design scattering (DLS) and photon correlation spectroscopy to (QbD) to improve efficiency and ensure good quality and analyse particle size in the range of 0.1 nm to 12.3 pm with reduced variability throughout the drug production process. sample suspension concentrations from 0.00001% to 40%. DLS is also a rapid and cost effective method for What is QbD? measuring the particle by particle surface charge known as zeta potential that controls the stability of suspensions. QbD is defined by The International Conference on Harmonization as “A systematic approach to development Porosity that begins with predefined objectives and emphasizes product and process understanding and process control, The properties of a tablet are almost entirely defined by the based on sound science and quality risk management.” [2]. The compaction behaviour of excipients during compression. FDA’s process validation (PV) guidance [3] is also important The tablets tendency to break apart (friability), solidity and and adds further clarification, providing a standardised and dissolution behaviour are all attributes that are linked to systematic approach for clinicians, consumers and investors.
    [Show full text]
  • The Elzone II 5390
    TheThe Elzone Elzone II II 5390 5390 Particle Count and Size Analyzer Elzone II Overview of Basic Theory • Operates using the Electrical Sensing Zone (ESZ) Principle, also known as the Coulter Principle. • First commercially available Elzone system was introduced in 1963. • Fully compliant to the ISO 13319 Standard - Determination of Particle Size Distributions- Electrical Sensing Zone Method, as well as numerous ASTM methods. • Technology has been standardized for use in automated blood cell counters as well as a characterization method for many biological and industrial products. • Thousands of references for the use of various Electrical Sensing Zone models documented. • The highest resolution technology available for particle counting and sizing. Elzone II Overview of Basic Theory • Individual Particle Size and Concentration are Measured. Not calculated. • Particle size is represented as the equivalent spherical volume diameter. • Operation is not affected bycolor of sample or refractive indexes (as is when using other analytical methods). • Capable of performing count and size of very low concentration samples if necessary. • Particle concentration is determined using an accurate metering device. • Dynamic size measurements are made in real time. • Capable of performing analyses with samples suspended in an aqueous buffer solution or hazardous diluents. Elzone II Overview of Basic Theory • Particles suspended in an electrolyte solution are drawn through a small aperture. Across the aperture a voltage is applied. This creates the “sensing zone.” • Particles passing through the aperture displace a volume of electrolytic solution equal to the particle’s own volume. • Displaced electrolyte causes a change in resistance across the aperture resulting in a voltage pulse. • Pulse intensity is proportional to the particle volume.
    [Show full text]
  • Open Research Online Oro.Open.Ac.Uk
    Open Research Online The Open University’s repository of research publications and other research outputs Potential Microbial Processes In An Ancient Martian Environment, An Investigation Into Bio-Signature Production And Community Ecology Thesis How to cite: Curtis-Harper, Elliot (2017). Potential Microbial Processes In An Ancient Martian Environment, An Investigation Into Bio-Signature Production And Community Ecology. PhD thesis The Open University. For guidance on citations see FAQs. c 2017 The Author https://creativecommons.org/licenses/by-nc-nd/4.0/ Version: Version of Record Link(s) to article on publisher’s website: http://dx.doi.org/doi:10.21954/ou.ro.0000cc45 Copyright and Moral Rights for the articles on this site are retained by the individual authors and/or other copyright owners. For more information on Open Research Online’s data policy on reuse of materials please consult the policies page. oro.open.ac.uk Potential microbial processes in an ancient martian environment, an investigation into bio- signature production and community ecology Elliot Curtis-Harper B.Sc. Natural Sciences (Hons) A Thesis Submitted for the Degree of Doctor of Philosophy Astrobiology April 2017 Department of Physical Sciences The Open University UK i Declaration The research described herein was funded by STFC (Science and Technologies Funding Council) and conducted at The Open University. All of the research carried out in this thesis is my own original research, with the following exceptions: • MiSeq sequencing (Chapters 2 and 3). Conducted by a bioinformatics company (Research and Testing Laboratory, Lubbock, Texas). All subsequent bioinformatic analyses was conducted myself. • XRF analysis (Chapter 3).
    [Show full text]
  • Whitepaper an Introduction to Nldft Models for Porosity Characterization Whitepaper
    WHITEPAPER AN INTRODUCTION TO NLDFT MODELS FOR POROSITY CHARACTERIZATION WHITEPAPER AN INTRODUCTION TO NLDFT MODELS FOR POROSITY CHARACTERIZATION Non-local density functional theory (NLDFT) models In gas adsorption, DFT is used to model the properties of are used to determine the porosity of a sample – pore the sorptive fluid, typically nitrogen, confined in porous size and pore size distribution – from measured gas solids [1-2]. adsorption isotherms. Here we provide simple, easy- to-understand answers to frequently asked questions Work to apply DFT to adsorption isotherms began in relating to this topic, supplying the background the 1980s with the work of Seaton et al. [3] who first understanding needed for effective application of this proposed a procedure for determination of the pore powerful mathematical tool. size distribution of porous carbons from adsorption isotherms and a simple DFT model. In this procedure the pore size distribution is obtained as a solution of What is DFT? And NLDFT? the adsorption integral equation. Specifically, the aim Density functional theory (DFT) is a mathematical was to effectively describe the non-homogeneous method or tool used in quantum physics to determine fluid behavior associated with phase changes that occur an approximate solution to the Schrödinger equation when fluids are constrained by walls, capillaries and slits. for a multi-bodied system. Let’s unpack that somewhat Scientists from Micromeritics were pioneers in this area complex sentence to relate DFT to the practicalities of and worked extensively on improving the application of gas adsorption studies. DFT around this time [4-6]. By 1993, those leading the way had recognized the superiority of using non-local In simple terms, the solution of Schrödinger’s equation density approximations, a refinement of DFT, for gas is a probability function called a wave function that adsorption analysis, and the application of non-local describes the likelihood of finding an electron in a certain DFT (NLDFT) progressed steadily from this time [6-7].
    [Show full text]
  • Lead and Arsenic Speciation and Bioaccessibility Following Sorption on Oxide Mineral Surfaces
    LEAD AND ARSENIC SPECIATION AND BIOACCESSIBILITY FOLLOWING SORPTION ON OXIDE MINERAL SURFACES Dissertation Presented in Partial Fulfillment of the Requirements for the Degree Doctor of Philosophy in the Graduate School of The Ohio State University By Douglas Gerald Beak, B.S. ***** The Ohio State University 2005 Dissertation Committee: Approved by Dr. Nicholas Basta, Co Advisor Dr. Samuel Traina, Co Advisor _________________________ Co Advisor Dr. Harold Walker Dr. Kirk Scheckel _________________________ Co Advisor Soil Science Graduate Program ABSTRACT The risk posed from incidental ingestion of arsenic-contaminated or lead- contaminated soil may depend on sorption of arsenate (As(V)) or lead (Pb(II)) to oxide surfaces in soil. Arsenate or lead sorbed to ferrihydrite, corundum, and birnessite model oxide minerals were used to simulate possible effects of ingestion of soil contaminated with As(V) or Pb(II). Arsenate or lead sorbed oxides were placed in a simulated gastrointestinal tract (in vitro) to ascertain the bioaccessibility of As(V) or Pb(II) and changes in As(V) or Pb(II) surface speciation. The speciation of As or Pb was determined using EXAFS and XANES analysis. The As(V) adsorption maximum was found to be 7.04 g kg-1, and 0.47 g kg-1 for ferrihydrite and corundum, respectively. The bioaccessible As(V) for ferrihydrite ranged form 0 to 5 % and for corundum ranged from 0 to 16 %. The surface speciation for ferrihydrite and corundum was determined to be binuclear bidentate. These results for As(V) sorbed to ferrihydrite and corundum suggest that the bioaccessibility of As(V) is related to the As(V) concentration, and the As(V) adsorption maximum.
    [Show full text]
  • Particle Size and Particle Shape
    4356 Communications Drive Norcross, GA 30093 USA Telephone: 770.662.3660 Fax: 678.348.7565 Email: [email protected] Particle Size and Particle Shape Laser Light Scattering - Mie and Fraunhofer Theories 520 - 00 Aqueous - based dispersion (ISO 13320).......................................................................................................$250 520 - 01 Non-aqueous - based dispersion (ISO 13320 )..............................................................................................$250 520 - 50 Dry dispersion (ISO 13320) using Malvern Mastersizer.................................................................................$250 X- Ray Sedimentation - Stokes’ Law 510 - 00 Aqueous and non-aqueous based dispersion (ISO 13317 - 3) (Requires density 133 - 00 prior to analysis)................................................................................................$250 Electrical Sensing Zone - “Coulter principle” 538 - 00 Aqueous and non-aqueous based dispersion (ISO 13319)..........................................................................$300 538 - 02 Particle Size Distribution plus particle concentration analysis (ISO 13319)................................................$325 538 - 50 Emission stack testing, particle size analysis of fly ash particles collected on filters (ISO 13319).......................................................................................................................................$325 Particle Shape Analysis 005 - 80 Particle shape using Wet dispersion and Dynamic
    [Show full text]
  • Microreport M I C R O M E R I T I C S I N S T R U M E N T C O R P O R a T I O N Volume 23 No
    E H T microReport M ICRO M ERITICS I NSTRU M ENT C ORPORATION VOLUME 23 NO. 1 Micromeritics’ New 3Flex - Versatile High- Throughput Surface Area, Mesopore, and Micropore Surface Characterization The 3FlexTM Surface Characterization Analyzer is a fully automated, three-station instrument capable of high-throughput surface area and pore size analyses In This Issue with superior accu- racy, resolution, and MicroActiveTM Micromeritics’ New 3Flex ............. 1 data reduction. Each Particulate Systems NanoPlus analysis station is DLS Nano Particle Size and Zeta upgradeable from Potential Analyzer .................... 3 mesopore to micro- pore with its own Micromeritics to Showcase its transducers for cur- Extensive Line of Materials rent or future high- Characterization Instruments and throughput needs. A Services at Pittcon 2013 .............. 4 single 3Flex with its Guest Article “Carbon Dioxide minimal footprint and three configurable analysis stations eliminates Characterization of Carbons with the costly investment in multiple instruments and additional bench space. TriStar II 3020” .............................. 6 The 3Flex provides a remarkable savings on analysis time compared to a single- or two-station instrument. Micropore ports include kryp- Particle Characterization Solutions ton capability for low surface area materials. Heated vapor analysis for Appearance and Structure capability is standard and an extended-range vapor option is also Assessment of Lyophilized available. Biopharmaceutical Compounds ... 8 Capturing the filling of micropores can be a challenge because, at Micromeritics Analytical Services cryogenic temperatures, micropores begin to fill at very low pressures Article: “Physical Characterization of (around 10-6 torr). A single dose of gas, such as nitrogen, could com- Shale,” News and Events ........... 9 pletely fill micropores such as those contained in zeolites.
    [Show full text]
  • Micromeritics Training Center
    MICROMERITICS PRODUCT BROCHURE www.micromeritics.com PHYSISORPTION Carefully engineered to perform surface area and porosity measurements, the physisorption line of instruments determines the quality and utility of a wide range of materials. Though different materials can appear to be identical, variations in the surface area and porosity can greatly influence the material’s performance characteristics. Micromeritics offers a large selection of gas sorption analyzers that will fulfill demanding requirements for determining surface area and porosity. MICROMERITICS Low Surface Area Sample Ports Pore Size Range Measurement micro meso 3Flex micro meso ASAP 2020 micro* meso TriStar II micro* meso Gemini VII ASAP 2420 micro meso * Micropore analysis can be performed on the TriStar II and Gemini VII with the use of CO2 The 3Flex is a fully automated, three-station instrument capable of high- throughput surface area, mesopore, and micropore analyses with superior accuracy, resolution, and data reduction and reporting versatility. Each analysis station is upgradeable from mesopore to micropore with its own set of pressure transducers. • Three independently configurable analysis stations • Micropore stations include krypton capability for low surface area materials – vapor is standard and an extended-range vapor option is available • Ultra-clean, leak-free operation with pneumatically actuated, hard seal valves • Interactively evaluate isotherm data with MicroActive software and user-defined reporting options – reduces time required to obtain surface area and porosity results • Innovative dashboard monitors and provides convenient access to real-time performance indicators and maintenance scheduling information The ASAP 2020 can obtain high-quality data for research and quality control applications and is designed to provide surface area, porosity, and chemical adsorption data to materials analysis laboratories.
    [Show full text]
  • Chemisorb 2750
    ChemiSorb 2750 Operator’s Manual 275-42805-01 April 2009 © Micromeritics Instrument Corporation 2004-2009. All rights reserved. WARRANTY MICROMERITICS INSTRUMENT CORPORATION warrants for one year from the date of shipment each instrument it manufactures to be free from defects in material and workmanship impairing its usefulness under normal use and service conditions except as noted herein. Our liability under this warranty is limited to repair, servicing and adjustment, free of charge at our plant, of any instrument or defective parts when returned prepaid to us and which our examination discloses to have been defective. The purchaser is responsible for all transportation charges involving the shipment of materials for war- ranty repairs. Failure of any instrument or product due to operator error, improper installation, unauthorized repair or alteration, failure of utilities, or environmental contamination will not constitute a warranty claim. The materials of construction used in MICROMERITICS instruments and other products were chosen after extensive testing and experience for their reliability and durability. However, these materials cannot be totally guaranteed against wear and/or decomposition by chemical action (corrosion) as a result of normal use. Repair parts are warranted to be free from defects in material and workmanship for 90 days from the date of shipment. No instrument or product shall be returned to MICROMERITICS prior to notification of alleged defect and authorization to return the instrument or product. All repairs or replacements are made subject to factory inspec- tion of returned parts. MICROMERITICS shall be released from all obligations under its warranty in the event repairs or modifications are made by persons other than its own authorized service personnel unless such work is authorized in writing by MICROMERITICS.
    [Show full text]
  • An Integrated Study of the Ceramic Processing of Yttria James Alan Voigt Iowa State University
    Iowa State University Capstones, Theses and Retrospective Theses and Dissertations Dissertations 1986 An integrated study of the ceramic processing of yttria James Alan Voigt Iowa State University Follow this and additional works at: https://lib.dr.iastate.edu/rtd Part of the Chemical Engineering Commons Recommended Citation Voigt, James Alan, "An integrated study of the ceramic processing of yttria " (1986). Retrospective Theses and Dissertations. 8045. https://lib.dr.iastate.edu/rtd/8045 This Dissertation is brought to you for free and open access by the Iowa State University Capstones, Theses and Dissertations at Iowa State University Digital Repository. It has been accepted for inclusion in Retrospective Theses and Dissertations by an authorized administrator of Iowa State University Digital Repository. For more information, please contact [email protected]. INFORMATION TO USERS This reproduction was made from a copy of a manuscript sent to us for publication and microfilming. While the most advanced technology has been used to pho­ tograph and reproduce this manuscript, the quality of the reproduction is heavily dependent upon the quality of the material submitted. Pages in any manuscript may have indistinct print. In all cases the best available copy has been filmed. The following explanation of techniques is provided to help clarify notations which may appear on this reproduction. 1. Manuscripts may not always be complete. When it is not possible to obtain missing pages, a note appears to indicate this. 2. When copyrighted materials are removed from the manuscript, a note ap­ pears to indicate this. 3. Oversize materials (maps, drawings, and charts) are photographed by sec­ tioning the original, beginning at the upper left hand comer and continu­ ing from left to right in equal sections with small overlaps.
    [Show full text]
  • Gemini VII 2390 Surface Area Analyzer
    Gemini VII 2390 Surface Area Analyzer Gemini VII Bibliography of Peer-Reviewed Papers 2013 Title Author / Publication Citation ..measurements of MWCNTs (before and after gelation) were evaluated using a Surface Area and ‘Bucky gel’ of multiwalled carbon Pore Size Analyzer (Gemini-V, Micromeritics, USA). X-ray diffraction (XRD) patterns of pristine and nanotubes as electrodes for high Manoj K Singh / Yogesh Kumar / S A Hashmi , Nanotechnology, 24 (46), p.465704, Nov gelled MWCNTs were recorded with a high- performance, flexible electric double 2013 resolution... layer capacitors ..samples were measured via N 2 adsorption at −196 °C on a Micromeritics ASAP 2020 analyzer 3DOM InVO 4 -supported chromia with with the samples outgassed at 300 Wang, Yuan / Dai, Hongxing / Deng, Jiguang °C...microscopic (SEM) images of the samples good performance for the visible-light- / Liu, Yuxi / Arandiyan, Hamidreza / Li, were recorded on a Gemini Zeiss Supra 55 driven photodegradation of rhodamine Xinwei / Gao, Baozu / Xie, Shaohua, Solid apparatus (operating at 10 kV). Transmission... State Sciences, 24, p.62-70, Oct 2013 B ..adsorption study Nitrogen adsorption-desorption isotherms were recorded at −196 °C on a Micromeritics automatic surface area analyzer A completely solvent-free process for Hoashi, Yohei / Tozuka, Yuichi / Takeuchi, (Gemini 2375, Shimadzu). Samples were heated at the improvement of erythritol Hirofumi, International Journal of 100 °C for 12 h under vacuum before Pharmaceutics, 455 (1-2), p.132-137, Oct measurement... compactibility 2013 ..of the samples were determined using the nitrogen adsorption/desorption isotherms Ding, Yi / Yin, Guangfu / Liao, Xiaoming / recorded at 77.4 K using a Micromeritics Gemini A convenient route to synthesize SBA- Huang, Zhongbing / Chen, Xianchun / Yao, analyser.
    [Show full text]
  • Microreport the Science and Technology of Small Particles™ M ICROMERITICS I NSTRUMENT C ORPORATION VOLUME 16 NO
    THE microReport The Science and Technology of Small Particles™ M ICROMERITICS I NSTRUMENT C ORPORATION VOLUME 16 NO. 1 In This Issue New Elzone Combines New Elzone Combines Modern Technology with Modern Technology with Proven Method New Elzone available in Proven Method 2005 .....................................1 icromeritics is prepar- Micromeritics’ Tony Thornton ing to release our new Appointed Chairman of ISO MElzone® II 5390 particle Committee on Particle Sizing sizing and counting instrument. Will assist in the establishment The Elzone series is based on the of U.S. and International “electrical sensing zone” tech- Particle Sizing Standards...3 nique, also known as the “Coulter Principle.” The first instru- Micromeritics Showcases ment of this type was invented Instruments at the in the 1950’s by Wallace H. Pittsburgh Conference.......4 Coulter, founder of the Coulter Corporation, and it quickly Perform Longer Surface became the preferred method for counting blood cells. Area Measurements with The Gemini Today, this technique is widely accepted and recognized as New Gemini allows for longer analysis times..........5 a highly effective method of sizing and counting particles composed of a wide variety of organic and inorganic materi- What’s New at Micromeritics als. Unlike other particle measurement techniques such as Analytical Services ...........6 laser light scattering, sedimentation, or image analysis, the electrical sensing zone method can analyze samples of vary- Also... ing optical properties, densities, colors, shapes, and orienta- Training Courses.................7 tions. Micromeritics’ Elzone particle size analyzer uses this Events..................................7 powerful particle characterization technique to determine quickly and accurately the size, number, concentration, and mass of a wide variety of finely divided materials.
    [Show full text]