Size-dependent yield stress in twinned gold nanowires mediated by site-specific surface dislocation emission

2009 ◽  
Vol 95 (9) ◽  
pp. 091914 ◽  
Author(s):  
Chuang Deng ◽  
Frederic Sansoz
Keyword(s):  
Specific Surface ◽  
Yield Stress ◽  
Gold Nanowires ◽  
Dislocation Emission ◽  
Site Specific ◽  
Size Dependent

Influence of Ground Slag on the Rheology of Mortar

2013 ◽  
Vol 438-439 ◽  
pp. 67-71
Author(s):  
Qian Qian Zhang ◽  
Jian Zhong Liu ◽  
Jia Ping Liu
Keyword(s):  
Film Thickness ◽  
Specific Surface ◽  
Yield Stress ◽  
Surface Area ◽  
Specific Surface Area ◽  
Water Film ◽  
Plastic Viscosity ◽  
Rheological Parameters ◽  
Water Film Thickness ◽  
Binder Ratio

The effects of ground slag with different specific surface area on the rheology of mortar at water-binder ratio of 0.25, 0.28 and 0.30 were investigated, and the combined effects of packing density and solid surface area on the rheology of mortar were evaluated in terms of the water film thickness. The results show that with the increasing of specific surface area of slag (220 m2/kg-784 m2/kg), plastic viscosity and yield stress decrease. The correlations of yield stress and plastic viscosity to the water film thickness are basically linear with high correlation R2 values. The action of the ground slag on the rheology of mortar can be characterized by water film thickness, and with the increasing of water film thickness the rheological parameters decrease.

Site-Specific Surface Functionalization via Microchannel Cantilever Spotting (µCS): Comparison between Azide-Alkyne and Thiol-Alkyne Click Chemistry Reactions

Small ◽  
2018 ◽  
Vol 14 (21) ◽  
pp. 1800131 ◽  
Author(s):  
Seyed Mohammad Mahdi Dadfar ◽  
Sylwia Sekula-Neuner ◽  
Uwe Bog ◽  
Vanessa Trouillet ◽  
Michael Hirtz
Keyword(s):  
Specific Surface ◽  
Click Chemistry ◽  
Surface Functionalization ◽  
Site Specific

Site-Specific and Size-Dependent Bonding of Compositionally Precise Gold−Thiolate Nanoparticles from X-ray Spectroscopy

2010 ◽  
Vol 1 (12) ◽  
pp. 1821-1825 ◽  
Author(s):  
Mark A. MacDonald ◽  
Peng Zhang ◽  
Huifeng Qian ◽  
Rongchao Jin
Keyword(s):  
Site Specific ◽  
X Ray ◽  
Size Dependent ◽  
Gold Thiolate

Site-specific Surface Chemistry on Nanotubes

2010 ◽  
Vol 50 (4) ◽  
pp. 449-452 ◽  
Author(s):  
U. Burghaus ◽  
A. Zak ◽  
R. Rosentsveig
Keyword(s):  
Surface Chemistry ◽  
Specific Surface ◽  
Site Specific

scholarly journals Size-Dependent Specific Surface Area of Nanoporous Film Assembled by Core-Shell Iron Nanoclusters

2006 ◽  
Vol 2006 ◽  
pp. 1-4 ◽  
Author(s):  
Jiji Antony ◽  
Joseph Nutting ◽  
Donald R. Baer ◽  
Daniel Meyer ◽  
Amit Sharma ◽  
...  
Keyword(s):  
Specific Surface ◽  
Chemical Reactivity ◽  
Calculated Data ◽  
Inert Atmosphere ◽  
Core Shell ◽  
Porous Films ◽  
Shell Nanoparticles ◽  
Size Dependent ◽  
Surface Areas ◽  
Nanoporous Films

Nanoporous films of core-shell iron nanoclusters have improved possibilities for remediation, chemical reactivity rate, and environmentally favorable reaction pathways. Conventional methods often have difficulties to yield stable monodispersed core-shell nanoparticles. We produced core-shell nanoclusters by a cluster source that utilizes combination of Fe target sputtering along with gas aggregations in an inert atmosphere at7∘C. Sizes of core-shell iron-iron oxide nanoclusters are observed with transmission electron microscopy (TEM). The specific surface areas of the porous films obtained from Brunauer-Emmett-Teller (BET) process are size-dependent and compared with the calculated data.

Surface Defect Analysis by Using a Novel Backside XTEM Sample Preparation Method

2006 ◽  
Author(s):  
Jian-Shing Luo ◽  
Lang-Yu Huang ◽  
Wen-Lon Gu ◽  
Jeremy D. Russell
Keyword(s):  
Sample Preparation ◽  
Specific Surface ◽  
Surface Defect ◽  
Surface Defects ◽  
Preparation Method ◽  
Defect Analysis ◽  
Sample Preparation Method ◽  
Tem Analysis ◽  
Site Specific ◽  
Electron Spectrometry

Abstract This paper demonstrates a novel method of XTEM sample preparation for site-specific surface defect analysis using backside polishing. Analysis of three different types of site-specific surface defects was demonstrated using a novel backside XTEM sample preparation method. The details of the backside XTEM sample preparation method and some examples are reported in this paper. Comparing to Auger electron spectrometry (AES) results on similar defects, more detailed and precise information is observed using TEM analysis with this method. It is therefore a complementary technique to traditional AES analysis on surface defects for contamination with atomic level concentration. From the results, the sample preparation method can produce a clean, pristine surface that is well characterized and could be reproduced, successfully.

Photoluminescence modulation of an atomically precise silver(i)–thiolate cluster via site-specific surface engineering

2018 ◽  
Vol 47 (42) ◽  
pp. 14884-14888 ◽  
Author(s):  
Yan-Ling Li ◽  
Wen-Min Zhang ◽  
Jie Wang ◽  
Yuan Tian ◽  
Zhao-Yang Wang ◽  
...  
Keyword(s):  
Surface Modification ◽  
Specific Surface ◽  
Surface Engineering ◽  
Site Specific ◽  
Pyridyl Ligands ◽  
Wide Range

Wide-range photoluminescence modulation of a Ag12 nanocluster was achieved by site-specific surface modification with a variety of fluorescent pyridyl ligands.

The series Os4(µx-η2-C2Ph2)(CO)14–n (n = 0, 1, 2; x = n + 2) — Models for site-specific surface catalysts

2006 ◽  
Vol 84 (2) ◽  
pp. 176-186 ◽  
Author(s):  
John P Canal ◽  
Michael C Jennings ◽  
Glenn PA Yap ◽  
Roland K Pomeroy
Keyword(s):  
Specific Surface ◽  
Slow Rotation ◽  
Nmr Spectrum ◽  
Site Specific ◽  
H Nmr ◽  
Metal Atoms ◽  
Surface Catalysis ◽  
The Common ◽  
Exchange Surface ◽  
C Nmr

The cluster Os4(µ-η2-C2Ph2)(CO)14 (1) has been prepared from the reaction of Os4(CO)14 and C2Ph2 in CH2Cl2 at 25 °C. Other minor products include the known clusters Os3(µ3-η2-C2Ph2)(CO)10 and Os3(µ-η4-C4Ph4)(CO)9. The structure of 1 reveals an approximately planar C2Os4 skeleton with a dimetallacyclobutene ring (C—C = 1.32(4) Å) and a flat butterfly Os4 unit (Os—Os range = 2.859(2)–2.916(2) Å). The 13C{1H} NMR spectrum of 1 indicates the carbonyl ligands are rigid at room temperature. Stirring 1 in CH2Cl2 for 2 days (ambient temperature) afforded Os4(µ3-η2-C2Ph2)(CO)13 (2). The Os atoms in 2 also have an almost flat butterfly arrangement (Os—Os range = 2.7392(7)–2.8947(6) Å) with the alkyne ligand located over one of the Os3 triangles. The 13C NMR data for 2 are consistent with rapid rotation on the NMR timescale of the hinge Os(CO)3 units at 21 °C, but slow rotation at –50 °C. Heating 2 at 40 °C gave Os4(µ4-η2-C2Ph2)(CO)12 (3) after 2 days. Cluster 3 has the common butterfly arrangement of Os atoms with the C2Ph2 bound to all four metal atoms (Os—Os range = 2.7457(5)–2.8742(5) Å). The 13C{1H} NMR spectra of 3 at 21 and 90 °C indicate there is rapid CO exchange of the carbonyls of the two types of Os(CO)3 units, but not between the units. The spectrum at –90 °C indicates one of the rotations (presumed to be that involving the carbonyls of the wingtip Os(CO)3 units) is slowed on the NMR timescale. Compounds 1–3 form a unique series of clusters that have an alkyne ligand bound to two, three, and four metal atoms. Compound 1 is a model for a corner, compound 2 for a planar surface, and compound 3 a step site, in site-specific surface catalysts.Key words: osmium cluster, diphenylacetylene, dimetallacyclobutene, carbonyl exchange, surface catalysis.

Sign in / Sign up

Export Citation Format

Share Document