scholarly journals Melt Infiltration Processing of Foams Using Glass-Forming Alloys

2002 ◽  
Vol 754 ◽  
Author(s):  
C. San Marchi ◽  
A. Brothers ◽  
D. C. Dunand
Keyword(s):  
Thermal Conductivity ◽  
Metallic Glass ◽  
Relative Density ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Glass Forming ◽  
Melt Infiltration ◽  
First Time ◽  
Infiltration Techniques

ABSTRACTProcessing of foams from bulk metallic glass (BMG) alloys, using melt infiltration techniques, is reported for the first time. Foaming methods based on infiltration of two types of pattern materials are described: investment of a continuous refractory yielding very low relative density structures (5% dense relative to the BMG), and investment of a discontinuous refractory pellet bed yielding higher relative density (50–60% dense relative to the BMG). Both methods are capable of producing foam structures; however high surface area and diminished thermal conductivity, especially in lower density structures, make vitrification of the alloy difficult.

Formation of polysaccharide aerogels in ethanol

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 77362-77371 ◽  
Author(s):  
Gabrijela Tkalec ◽  
Željko Knez ◽  
Zoran Novak
Keyword(s):  
Thermal Conductivity ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Low Thermal Conductivity

High surface area and low thermal conductivity were observed for polysaccharide aerogels prepared by ethanol induced gelation.

THERMAL PROCESSING OF BUNDLED TUNGSTEN OXIDE NANOWIRES

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1541-1547 ◽  
Author(s):  
SHIBIN SUN ◽  
YIMIN ZHAO ◽  
YONGDE XIA ◽  
ZENGDA ZOU ◽  
GUANGHUI MIN ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Wide Band ◽  
Temperature Limit ◽  
Wide Band Gap ◽  
Significant Drop ◽  
Oxide Nanowires ◽  
First Time

Taking the wide band gap one-dimensional (1-D) tungsten oxide nanowires as an example, we here demonstrate systematically the physical characteristics of thermally processed nanowires at temperatures ranging from 400°C to 1000°C, for the first time. Accompanied by a significant drop of specific surface area from 151 m2/g for the as-prepared nanowires to 109 m2/g and 66 m2/g subject to annealing at 400°C and 450°C, dramatically morphology evolution and phase transformation have also been observed. The nanostructured bundles became straighter, larger in diameters and shorter in length, and eventually became irregular particles with size up to 5 µm. The Brunauer-Emmett-Tettler (BET) result suggests that 400°C can be considered as a top temperature limit in nanodevice design where high surface area is important, e.g. in gas sensors. A protocol for thermally processing of these bundled tungsten nanowires has been established.

scholarly journals Experimental Investigation on Flowability and Compaction Behavior of Spray Granulated Submicron Alumina Granules

ISRN Ceramics ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Abhisek Choudhary ◽  
Pandu Ramavath ◽  
Papiya Biswas ◽  
Nukala Ravi ◽  
Roy Johnson
Keyword(s):  
Relative Density ◽  
Surface Area ◽  
Flow Behavior ◽  
Compaction Pressure ◽  
High Surface ◽  
High Surface Area ◽  
Solid Loading ◽  
Alumina Powder ◽  
Flow Measurements ◽  
Spray Dried

Aqueous slurry with various solid loadings (up to 40 wt%) of alumina powder (D50 = 300 nm) with suitable rheological properties were spray dried into granules. Solid loading and feed rate of the slurry are found to have a prominent effect on the shape and size distribution of granules. Powder flow measurements exhibited a cohesive index of 28.45 signifying an extremely cohesive flow due to high surface area and irregular morphology. Finer sizes though it offers high geometrical surface area it leads to more surface contacts and hence, high interparticle friction. Spherical morphology achieved through optimum spray drying parameters significantly reduced the cohesive index to 6.45 indicating free flow behavior. Compaction studies of the spray-dried granules and corresponding plot of relative density versus compaction pressure revealed an agglomerate strength of 500 MPa followed by a plateau-like behavior reaching a maximum in the relative density of 59%-60% of the theoretical values.

Nanoporous metallic glass with high surface area

2006 ◽  
Vol 55 (10) ◽  
pp. 947-950 ◽  
Author(s):  
M.H. Lee ◽  
D.J. Sordelet
Keyword(s):  
Metallic Glass ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area

Unique perforated graphene derived from Bougainvillea flowers for high-power supercapacitors: a green approach

Nanoscale ◽  
2017 ◽  
Vol 9 (14) ◽  
pp. 4801-4809 ◽  
Author(s):  
Rajendra P. Panmand ◽  
Purnima Patil ◽  
Yogesh Sethi ◽  
Sunil R. Kadam ◽  
Milind V. Kulkarni ◽  
...  
Keyword(s):  
Surface Area ◽  
High Power ◽  
High Surface ◽  
High Surface Area ◽  
Single Step ◽  
Step Method ◽  
Green Approach ◽  
Template Free ◽  
First Time

Herein, we demonstrated a green approach for the synthesis of high surface area (850 m2 g−1) mesoporous perforated graphene (PG) from Bougainvillea flower for the first time using a template free single-step method.

Structure identification of Ti(iv) clusters in low-temperature TiO2 crystallization: creating high-surface area brush-shaped rutile TiO2

CrystEngComm ◽  
2017 ◽  
Vol 19 (39) ◽  
pp. 5844-5848 ◽  
Author(s):  
Kazuhiro Manseki ◽  
Kazuki Saka ◽  
Masaki Matsui ◽  
Saeid Vafaei ◽  
Takashi Sugiura
Keyword(s):  
Low Temperature ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Large Surface Area ◽  
Structure Identification ◽  
Rutile Tio2 ◽  
First Time

We demonstrate for the first time a controlled reaction of Cl-coordinating Ti(iv) clusters in low-temperature hydrolysis (27 °C) to create large-surface area rutile TiO2 crystals.

scholarly journals Synthetic Approaches for Accessing Rare-Earth Analogues of UiO-66

2021 ◽  
Author(s):  
P. Rafael Donnarumma ◽  
Sahara Frojmovic ◽  
Hudson de Aguiar Bicalho ◽  
Hatem M. Titi ◽  
Ashlee J Howarth
Keyword(s):  
Thermal Stability ◽  
Rare Earth ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Degree Of Crystallinity ◽  
Synthetic Approaches ◽  
High Degree ◽  
First Time

Rare-earth (RE) analogues of UiO-66 with non-functionalised 1,4-benzenedicarboxylate linkers are synthesised for the first time, and a series of synthetic approaches is provided to troubleshoot the synthesis. RE-UiO-66 analogues are fully characterised, and demonstrate a high degree of crystallinity, high surface area and thermal stability, consistent with the UiO-66 archetype.

scholarly journals Synthetic Approaches for Accessing Rare-Earth Analogues of UiO-66

2021 ◽  
Author(s):  
P. Rafael Donnarumma ◽  
Sahara Frojmovic ◽  
Hudson de Aguiar Bicalho ◽  
Hatem M. Titi ◽  
Ashlee J Howarth
Keyword(s):  
Thermal Stability ◽  
Rare Earth ◽  
Surface Area ◽  
High Surface ◽  
High Surface Area ◽  
Degree Of Crystallinity ◽  
Synthetic Approaches ◽  
High Degree ◽  
First Time

Rare-earth (RE) analogues of UiO-66 with non-functionalised 1,4-benzenedicarboxylate linkers are synthesised for the first time, and a series of synthetic approaches is provided to troubleshoot the synthesis. RE-UiO-66 analogues are fully characterised, and demonstrate a high degree of crystallinity, high surface area and thermal stability, consistent with the UiO-66 archetype.

From a metal–organic framework to hierarchical high surface-area hollow octahedral carbon cages

2015 ◽  
Vol 51 (73) ◽  
pp. 13945-13948 ◽  
Author(s):  
Arshad Aijaz ◽  
Jian-Ke Sun ◽  
Pradip Pachfule ◽  
Takeyuki Uchida ◽  
Qiang Xu
Keyword(s):  
Surface Area ◽  
Metal Organic Framework ◽  
High Surface ◽  
High Surface Area ◽  
Dye Uptake ◽  
Adsorption Capacities ◽  
Metal Organic ◽  
First Time ◽  
Organic Framework

High surface-area hollow octahedral carbon cages have been fabricated for the first time by carbonization of a metal–organic framework, which exhibit significant CO2 and H2 adsorption capacities and dye uptake.

High surface area zincosilicates as efficient catalysts for the synthesis of ethyl lactate: an in-depth structural investigation

2015 ◽  
Vol 17 (40) ◽  
pp. 26756-26765 ◽  
Author(s):  
Xavier Collard ◽  
Pierre Louette ◽  
Sonia Fiorilli ◽  
Carmela Aprile
Keyword(s):  
Surface Area ◽  
Mesoporous Materials ◽  
Excellent Agreement ◽  
Structural Investigation ◽  
High Surface ◽  
High Surface Area ◽  
Single Site ◽  
Ir Analysis ◽  
First Time ◽  
Mcm 41

Novel extra-small Zn-MCM-41 mesoporous materials were successfully prepared following a straightforward synthesis route. The insertion of zinc as single site species was investigated for the first time using XPS via the Auger parameter in a Wagner plot representation. The XPS findings resulted in excellent agreement with IR analysis.

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