Measurement of mechanical properties of alkaline-earth metal hexaboride one-dimensional nanostructures by nanoindentation

2012 ◽  
Vol 27 (9) ◽  
pp. 1218-1229 ◽  
Author(s):  
Xiaoxia Wu ◽  
Terry T. Xu
Keyword(s):  
Mechanical Properties ◽  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
One Dimensional ◽  
Image Position ◽  
One Dimensional Nanostructures

Abstract

Enhancement of yellow emission and afterglow in Sr3SiO5: Eu2+, Dy3+ by adding alkaline earth metal fluorides

2012 ◽  
Vol 27 (19) ◽  
pp. 2535-2539 ◽  
Author(s):  
Kai Dong ◽  
Junjie Liao ◽  
Siguo Xiao ◽  
Xiaoliang Yang ◽  
Jian Wen Ding
Keyword(s):  
Alkaline Earth ◽  
Earth Metal ◽  
Yellow Emission ◽  
Alkaline Earth Metal ◽  
Metal Fluorides ◽  
Image Position

Abstract

Magnesium, calcium and strontium salts of phenylacetic acid

2012 ◽  
Vol 68 (2) ◽  
pp. m29-m33 ◽  
Author(s):  
Jean-Baptiste Arlin ◽  
Alan R. Kennedy ◽  
Kenneth Shankland
Keyword(s):  
Alkaline Earth ◽  
Phenylacetic Acid ◽  
Bound Water ◽  
Earth Metal ◽  
Metal Salts ◽  
Alkaline Earth Metal ◽  
One Dimensional ◽  
Structural Types ◽  
Polymeric Chains ◽  
Inorganic Layers

Three alkaline earth metal salts of phenylacetic acid were examined and all were found to have similar structural types to analogous salts of benzoic and halobenzoic acids. Thus, a synchrotron study shows that the cations incatena-poly[[[tetraaquamagnesium(II)]-μ-phenylacetato-κ2O:O′] phenylacetate], {[Mg(C8H7O2)(H2O)4](C8H7O2)}n, form a one-dimensional coordination polymer that propagates through Mg—O—C—O—Mg interactions involving both crystallographically independent Mg centres (Z′ = 2) and through translation along theaaxis. The polymeric chains pack to give alternate inorganic layers and organic bilayers. The Ca and Sr speciescatena-poly[[[diaqua(phenylacetato-κ2O,O′)calcium(II)]-μ3-phenylacetato-1′:1:1′′κ4O:O,O′:O′] monohydrate], {[Ca(C8H7O2)2(H2O)2]·H2O}n, andcatena-poly[[[diaqua(phenylacetato-κ2O,O′)strontium(II)]-μ3-phenylacetato-1′:1:1′′κ4O:O,O′:O′] monohydrate], {[Sr(C8H7O2)2(H2O)2]·H2O}n, are essentially isostructural. Both form one-dimensional coordination polymers through a carboxylate group that forms fourM—O bonds. The polymeric chains propagatevia21screw axes parallel to thebaxis and are further linked in thebcplane by hydrogen bonding involving the non-metal-bound water molecule. Similarly to the Mg salt, both have inorganic layers that alternate with organic bilayers.

Alkaline earth metal salts of 1-naphthoic acid

2012 ◽  
Vol 68 (8) ◽  
pp. m213-m218 ◽  
Author(s):  
Jean-Baptiste Arlin ◽  
Alan R. Kennedy
Keyword(s):  
Alkaline Earth ◽  
Earth Metal ◽  
Metal Salts ◽  
Alkaline Earth Metal ◽  
Carboxylate Group ◽  
One Dimensional ◽  
Naphthoic Acid ◽  
Polymeric Chains ◽  
The Common ◽  
Channel Structures

The structures of the Mg, Ca, Sr and Ba salts of 1-naphthoic acid are examined and compared with analogous structures of salts of benzoate derivatives. It is shown thatcatena-poly[[[diaquabis(1-naphthoato-κO)magnesium(II)]-μ-aqua] dihydrate], {[Mg(C11H7O2)2(H2O)3]·2H2O}n, exists as a one-dimensional coordination polymer that propagates only through Mg—OH2—Mg interactions along the crystallographicbdirection. In contrast with related benzoate salts, the naphthalene systems are large enough to prevent inorganic chain-to-chain interactions, and thus species with inorganic channels rather than layers are formed. The Ca, Sr and Ba salts all have metal centres that lie on a twofold axis (Z′ = 1 \over 2) and all have the common namecatena-poly[[diaquametal(II)]-bis(μ-1-naphthoato)-κ3O,O′:O;κ3O:O,O′], [M(C11H7O2)2(H2O)2]n, whereM= Ca, Sr or Ba. The Ca and Sr salts are essentially isostructural, and all three species form one-dimensional coordination polymers through a carboxylate group that forms threeM—O bonds. The polymeric chains propagatevia c-glide planes and throughMOMO four-membered rings. Again, inorganic channel structures are formed rather than layered structures, and the three structures are similar to those found for Ca and Sr salicylates and other substituted benzoates.

One-dimensional polymeric carbon structure based on five-membered rings in alkaline earth metal dicarbidesBeC2andMgC2

2010 ◽  
Vol 82 (12) ◽  
Author(s):  
Pornjuk Srepusharawoot ◽  
Andreas Blomqvist ◽  
C. Moysés Araújo ◽  
Ralph H. Scheicher ◽  
Rajeev Ahuja
Keyword(s):  
Alkaline Earth ◽  
Earth Metal ◽  
Alkaline Earth Metal ◽  
Carbon Structure ◽  
One Dimensional ◽  
Polymeric Carbon

scholarly journals La chimica dei nanocomposti e la loro applicazione al restauro dei manoscritti

2018 ◽  
Author(s):  
Giovanna Poggi ◽  
Nicole Bonelli ◽  
Rodorico Giorgi ◽  
Piero Baglioni
Keyword(s):  
Mechanical Properties ◽  
Alkaline Earth ◽  
Environmental Pollutants ◽  
Earth Metal ◽  
Metal Hydroxide ◽  
Alkaline Earth Metal ◽  
Gel Formulations ◽  
Nanoparticles Dispersions

Cellulose-based artifacts are susceptible to fast degradation due to the presence of detrimental components and to the action of environmental pollutants. As a result, the acidity of pristine material increases, promoting the acid-catalysed depolymerisation of cellulose that alters the mechanical properties of paper. In this paper, the use of innovative dispersions of alkaline earth metal hydroxide nanoparticles will be discussed as a method of counteracting the degradation of paper. The application of the most recent formulations of nanoparticles dispersions for the deacidification of artworks will be highlighted. Finally, the usage of innovative gel formulations for the cleaning of cellulose-based artworks will be discussed.

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