ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Practical aspects of Kelvin probe force microscopy (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1756-1760 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We discuss practical aspects of Kelvin probe force microscopy (KFM) which are important to obtain stable images of the electric surface potential distribution at high spatial resolution (〈100 nm) and high potential sensitivity (〈1 mV) on conducting and nonconducting samples. We compare metal-coated and semiconducting tips with respect to their suitability for KFM. Components of the metal coating can become detached during scanning, introducing sudden offset jumps in the potential maps (typically up to 350 mV between adjacent scan lines). However, n-doped silicon tips show no substantial tip alterations and, therefore, provide a stable reference during the experiment (offset jumps typically up to 40 mV between adjacent scan lines). These semiconducting tips must be electrically connected via contact pads. We use InGa and colloidal silver pads which are easily applied to the substrate supporting the cantilever and have a low enough differential contact resistance (350 Ω and 2.2 kΩ, respectively). Furthermore, we introduce a simple procedure to fine tune the feedback which detects the electric surface potential and show how the basic KFM setup has to be modified to gain access to the necessary control signals. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149664
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Resolution and contrast in Kelvin probe force microscopy (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 1168-1173 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The combination of atomic force microscopy and Kelvin probe technology is a powerful tool to obtain high-resolution maps of the surface potential distribution on conducting and nonconducting samples. However, resolution and contrast transfer of this method have not been fully understood, so far. To obtain a better quantitative understanding, we introduce a model which correlates the measured potential with the actual surface potential distribution, and we compare numerical simulations of the three-dimensional tip–specimen model with experimental data from test structures. The observed potential is a locally weighted average over all potentials present on the sample surface. The model allows us to calculate these weighting factors and, furthermore, leads to the conclusion that good resolution in potential maps is obtained by long and slender but slightly blunt tips on cantilevers of minimal width and surface area. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368181
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Conformation of Crystalline 3-(4-Methoxyphenyl)-2,2,4,4-tetramethylpentane (1996)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 52 (1996), S. 3232-3234 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270196011031
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Effect of hydrothermal treatment on the gelatinisation properties of potato starch as measured by differential scanning calorimetry (1996)
    Springer
    Journal of thermal analysis and calorimetry 47 (1996), S. 1229-1246 
    Details
    ISSN: 1572-8943
    Keywords: DSC ; gelatinisation ; potato starch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Gelatinisation temperatures as a function of moisture content were determined for potato starch. The native starch was then hydrothermally treated at a temperature 3% (Kelvin degrees) below the gelatinisation peak temperature and at moisture levels varying from 20 to 67% (by weight). Gelatinisation temperatures, temperature ranges and enthalpy values were affected for all treated samples. However, two sample populations could be distinguished: those samples treated under ‘limited’ moisture conditions and other samples treated in the presence of ‘extragranular’ moisture. A two-step hydrothermal treatment further increased the gelatinisation temperature, but the effect of the second step was small in comparison to that of the first.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01992825
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    A screen for lethal mutations in the chromosomal region 59AB suggests that bellwether encodes the alpha subunit of the mitochondrial ATP synthase in Drosophila melanogaster (1998)
    Springer
    Molecular genetics and genomics 259 (1998), S. 383-387 
    Details
    ISSN: 1617-4623
    Keywords: Key wordsbellwether ; moa ; ATP synthase ; Cyclin B ; Cell cycle
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We report the isolation and complementation mapping of lethal mutations within the 59AB region on the second chromosome of Drosophila melanogaster. The newly induced lethal mutations in this region define four different complementation groups. Using existing and newly induced deficiencies, these loci can be assigned to three different chromosomal intervals. Moreover, complementation analysis with chromosomes carrying various P element insertions, in combination with a molecular characterization of the corresponding insertion sites, suggests that the previously described male sterile mutation bellwether is an allele of an essential gene that encodes the alpha subunit of the mitochondrial ATP synthase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004380050826
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Na7I2(OH)5: Ein Hydroxidiodid im System NaOH/NaI (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1189-1192 
    Details
    ISSN: 0044-2313
    Keywords: Sodium hydroxide iodide ; synthesis ; single-crystals ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Na7I2(OH)5: A Hydroxide Iodide in the System NaOH/NaIThe pseudobinary system NaOH/NaI is investigated by X-ray methods. The crystal structure of the compound Na7I2(OH)5 was solved by single crystal data:Na7I2(OH)5: P4/nmm, Z = 2, a = 7.748(2) Å, c = 10.260(3) Å, Z(Fo) = 443 with (Fo)2 ≥ 3σ(Fo)2, Z(parameter) = 28, R/Rw = 0.044/0.059Na7I2(OH)5 crystallizes in a new type of structure which contains puckered layers of ∞2[Na7(OH)52+] connected via iodide ions.
    Notes: Das pseudobinäre System NaOH/NaI wurde röntgenographisch untersucht und die Struktur einer Verbindung, Na7I2(OH)5, mittels Röntgenstrukturanalyse an Einkristallen aufgeklärt:Na7I2(OH)5: P4/nmm, Z = 2, a = 7,748(2) Å, c = 10,260(3) Å, Z(Fo) = 443 mit (Fo)2 ≥ 3σ(Fo)2, Z(Parameter) = 28, R/Rw = 0,044/0,059.Die Verbindung kristallisiert in einem eigenen Strukturtyp, der gewellte Schichten von ∞2[Na7(OH)52+] enthält, die über I- verknüpft sind.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210713
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Na5Br(OH)4: Darstellung und Kristallstruktur einer Verbindung im System NaOH/NaBr (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1185-1188 
    Details
    ISSN: 0044-2313
    Keywords: Sodium bromide hydroxide ; synthesis ; single-crystals ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Na5Br(OH)4: Synthesis and Structure of a Compound in the System NaOH/NaBrThe pseudobinary system NaOH/NaBr is investigated by X-ray methods. The structure of the compound Na5Br(OH)4 was solved by single crystal data:Na5Br(OH)4: Pnma, Z = 8, a = 11.846(2) Å, b = 18.782(4) Å, c = 6.431(1) Å, Z(Fo) = 1 202 with (Fo)2 ≥ 3σ(Fo)2, Z(parameter) = 100, R/Rw = 0.030/0.035The compound crystallizes in a new type of structure. Pairs of octahedra around O by 5 Na and 1 H to [Na5(OH)]2 are orientated in such a way to one another that two ions OH- form a parallelogram hinting to unusual bent hydrogen bridge bonding.
    Notes: Das pseudobinäre System NaOH/NaBr wurde röntgenographisch untersucht und die Struktur von Na5Br(OH)4 mittels Röntgenstrukturanalyse an Einkristallen aufgeklärt:Na5Br(OH)4: Pnma, Z = 8, a = 11,846(2) Å, b = 18,782(4) Å, c = 6,431(1) Å, Z(Fo) = 1 202 mit (Fo)2 ≥ 3σ(Fo)2, Z(Parameter) = 100, R/Rw = 0,030/0,035.Auffällig an dem neuen Strukturtyp ist eine paarweise Anordnung von Oktaedern um O durch 5 Na und 1 H zu [Na5(OH)]2. Je zwei OH- sind so zueinander orientiert, daß auf ungewöhnlich gewinkelte H-Brücken auf zwei gegenüberliegenden Seiten eines Parallelogramms zu schließen ist.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210712
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    K2Br(OH) und Rb2Br(OH): Zwei neue ternäre Alkalimetallhalogenidhydroxide mit ausgeprägter Strukturverwandtschaft zu KOH bzw. RbOH (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 621 (1995), S. 1193-1196 
    Details
    ISSN: 0044-2313
    Keywords: Potassium bromide hydroxide ; Rubidium bromide hydroxide ; synthesis ; single-crystals ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: K2Br(OH) and Rb2Br(OH): Two New Ternary Alkali Metal Halide Hydroxides with a Pronounced Structural Relationship to KOH resp. RbOHTwo isotypic compounds K2Br(OH) and Rb2Br(OH) were prepared in the systems KOH/KBr and RbOH/RbBr. Their structures were determined by single crystal X-ray methods:K2Br(OH): P21/m, Z = 2, a = 6.724(1) Å, b = 4.272(4) Å, c = 8.442(2) Å, β = 108.14(2)°, Z(Fo) = 651 with (Fo)2 ≥ 3σ(Fo)2, Z(parameter) = 28, R/Rw = 0.041/0.047Rb2Br(OH): P21/m, Z = 2, a = 6.918(3) Å, b = 4.483(2) Å, c = 8.850(5) Å, β = 108.08(6)°, Z(Fo) = 326 mit (Fo)2 ≥ 3σ(Fo)2, Z(parameter) = 27, R/Rw = 0.074/0.082.The compounds are built up by chains of ∞1[M2(OH)+] connected via Br-. The structure of the chains as well as their orientation to one another show a pronounced relationship to the structures of the room temperature modifications of the isotypic binary hydroxides KOH and RbOH.
    Notes: In den pseudobinären Systemen KOH/KBr und RbOH/RbBr konnten die beiden isotypen Verbindungen K2Br(OH) und Rb2Br(OH) dargestellt werden. Ihre Struktur wurde mittels Röntgenstrukturanalyse an Einkristallen aufgeklärt:K2Br(OH): P21/m, Z = 2, a = 6,724(1) Å, b = 4,272(4) Å, c = 8,442(2) Å, β = 108,14(2)°, Z(Fo) = 651 mit (Fo)2 ≥ 3σ(Fo)2, Z(Parameter) = 28, R/Rw = 0,041/0,047.Rb2Br(OH): P21/m, Z = 2, a = 6,918(3) Å, b = 4,483(2) Å, c = 8,850(5) Å, β = 108,08(6)°, Z(Fo) = 326 mit (Fo)2 ≥ 3σ(Fo)2, Z(Parameter) = 27, R/Rw = 0,074/0,082.Die Verbindungen sind aus isolierten Strängen von ∞1[M2(OH)+] aufgebaut, die durch Br- verknüpft werden. Sowohl der Aufbau der einzelnen Stränge als auch ihre Orientierung zueinander zeigen eine deutliche Verwandtschaft zum Aufbau der Raumtemperaturform der ebenfalls isotypen binären Hydroxide KOH und RbOH.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19956210714
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Ba4[WN4]Cl2: The first nitridotungstate(VI) chloride (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 885-888 
    Details
    ISSN: 0044-2313
    Keywords: Barium tetra nitridotungstate(VI) dichloride ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Ba4[WN4]Cl2: Das erste Nitridowolframat(VI)-chloridDurch Umsetzung von Ba(NH2)2 mit W in einer KCl-Schmelze bei 850°C unter strömendem Stickstoff wurden transparente gelbe Kristalle von Ba4[WN4]Cl2 gezüchtet. Die Verbindung kristallisiert monoklin in P21/m und Z = 2 mit den Zellparametern a = 8,447(4) Å, b = 6,143(2) Å, c = 10,727(6) Å und β = 99,04(4)°. Die Kristallstruktur enthält isolierte Ionen [WN4]6- und Cl-. Es ist das erste bisher beschriebene Nitridowolframat(VI)-chlorid.
    Notes: Transparent yellow crystals of Ba4[WN4]Cl2 were grown at 850°C by the reaction of Ba(NH2)2 with W in a KCl melt under flowing nitrogen. The compound crystallizes monoclinic in P21/m and Z = 2 with the cell parameters a = 8.447(4) Å, b = 6.143(2) Å, c = 10.727(6) Å and β = 99.04(4)°. The crystal structure contains isolated anions [WN4]6- and Cl-. It is the first nitridotungstate(VI) chloride reported so far.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220523
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Cs5[Na{W4N10}]: The first framework nitridotungstate(VI)Professor Wolfgang Jeitschko zum 60. Geburtstag gewidmet (1996)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 622 (1996), S. 881-884 
    Details
    ISSN: 0044-2313
    Keywords: Penta caesium sodium nitrido tetra tungstate(VI) ; synthesis ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Cs5[Na{W4N10}]: Das erste Nitridowolframat(VI) mit GerüststrukturCs5[Na{W4N10}] wurde aus einem Gemenge von NaNH2, CsNH2 und Wolframpulver (Molverhältnis 1 : 10 : 4) bei 700°C in Autoklaven dargestellt. Nach beendeter Reaktion ist das Nitrid in einer Alkalimetallmatrix eingebettet. Dunkelrote Kristalle werden durch Auswaschen des Alkalimetalls mit flüssigem Ammoniak bei Raumtemperatur isoliert. Die Struktur von Cs5[Na{W4N10}] wurde über Röntgeneinkristalldaten bestimmt: I41 (Nr. 80), Z = 4, a = 13,926(3) Å, c = 8,723(3) Å, Z(Fo2) ≥ 3σ(Fo2) = 1535, Z(Variable) = 63, R/Rw = 0,040/0,052.An feuchter Luft hydrolysiert die Verbindung schnell zu Oxowolframat und Ammoniak. Sie enthält ein Tetraedergerüst ∞3[WNN3/21.5-]. Natrium ist von vier terminalen Stickstoffliganden umgeben. Einschließlich des Natriums ergibt sich eine Anordnung vom β-Cristobalittyp ∞3[Na{W4N10}5-]. Dieses enthält Caesium in allen Lücken, sogenannten Friauf-Polyedern, die durch zwölf Stickstoffliganden gebildet werden.
    Notes: Cs5[Na{W4N10}] was prepared from a mixture of NaNH2, CsNH2 and tungsten powder (molar ration 1 : 10 : 4) at 700°C in autoclaves. After the reaction is finished the nitride is embedded in an alkali metal matrix. Dark red crystals were isolated by washing out the alkali metal with liquid ammonia at room temperature. The structure of Cs5[Na{W4N10}] was solved by X-ray single crystal data: I41 (No. 80), Z = 4, a = 13.926(3) Å, c = 8.723(3) Å, Z(Fo2) ≥ 3σ(Fo2) = 1535, Z(Variables) = 63, R/Rw = 0.040/0.052.The compound is highly sensitive against moisture giving oxotungstates and ammonia. It contains a framework of tetrahedra ∞3[WNN3/21.5-]. Sodium shares four terminal nitrogen ligands. Including sodium a distorted, β-cristobalite type arrangement ∞3[Na{W4N10}5-] results. It contains caesium in all interstices formed by twelve nitrogen ligands in so-called Friauf polyhedra.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19966220522
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...