Theoretically predicted surface morphology of FCC cobalt nanoparticles induced by Ru promoter

2020 ◽  
Vol 10 (1) ◽  
pp. 187-195 ◽  
Author(s):  
Lili Liu ◽  
Mengting Yu ◽  
Qiang Wang ◽  
Bo Hou ◽  
Litao Jia ◽  
...  
Keyword(s):  
Surface Morphology ◽  
Cobalt Nanoparticles ◽  
The Stability ◽  
Ru Promoter ◽  
Exposed Facets

The addition of Ru promoter has an important role in tuning the stability of the exposed facets of FCC Co NPs, accompanied by the change of surface morphology.

scholarly journals Ag3PO4Semiconductor Photocatalyst: Possibilities and Challenges

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Gui-Fang Huang ◽  
Zhi-Li Ma ◽  
Wei-Qing Huang ◽  
Yong Tian ◽  
Chao Jiao ◽  
...  
Keyword(s):  
Recent Progress ◽  
Photocatalytic Performance ◽  
Catalytic Performance ◽  
Future Research ◽  
Fuel Production ◽  
Theoretical Understanding ◽  
Research Activities ◽  
Composite Photocatalysts ◽  
The Stability ◽  
Exposed Facets

Ag3PO4as a photocatalyst has attracted enormous attention in recent years due to its great potential in harvesting solar energy for environmental purification and fuel production. The photocatalytic performance of Ag3PO4strongly depends on its morphology, exposed facets, and particle size. The effects of morphology and orientation of Ag3PO4on the catalytic performance and the efforts on the stability improvement of Ag3PO4are reviewed here. This paper also discusses the current theoretical understanding of photocatalytic mechanism of Ag3PO4, together with the recent progress towards developing Ag3PO4composite photocatalysts. The crucial issues that should be addressed in future research activities are finally highlighted.

scholarly journals Surface morphology ofCuFeS2: The stability of the polar(112)/(112¯)surface pair

2015 ◽  
Vol 92 (15) ◽  
Author(s):  
Vincent H.-Y. Chen ◽  
Giuseppe Mallia ◽  
Ruth Martínez-Casado ◽  
Nicholas M. Harrison
Keyword(s):  
Surface Morphology ◽  
The Stability

Evolution of Mesas on Si(111) Surface Under Sublimation: Nanofabrication through the Control of Atomic Steps

2003 ◽  
Vol 782 ◽  
Author(s):  
Kee-Chul Chang ◽  
Jack M. Blakely
Keyword(s):  
Surface Morphology ◽  
Crystal Surface ◽  
Point Of View ◽  
Experimental Point ◽  
Atomic Steps ◽  
Step Dynamics ◽  
The Stability

ABSTRACTHow the surface morphology of a low index crystal surface evolves under annealing below the roughening temperature is still being investigated both theoretically and experimentally. This research is needed to understand the stability of nanostructures and for the control of step array on surfaces for various technological applications.We have approached this problem from an experimental point of view by looking at the step morphology on the top of mesas patterned on Si(111) after flashing at 1200°C and annealing between 1000–1100°C. We find that after annealing, nanometer height ridges develop on the edges of the mesas except for one edge which becomes a source for steps advancing into the mesa top. The edge that does not develop a ridge is mainly determined by the initial miscut of the surface.We attempt to explain our results through step dynamics and present some applications of this phenomena in creating novel arrays of steps.

Stability and Reactivity of [11-20] Step in Initial Stage of Epitaxial Graphene Growth on SiC(0001)

2014 ◽  
Vol 778-780 ◽  
pp. 1150-1153
Author(s):  
Hiroyuki Kageshima ◽  
Hiroki Hibino ◽  
Hiroshi Yamaguchi ◽  
Masao Nagase
Keyword(s):  
Surface Morphology ◽  
First Principles ◽  
Epitaxial Graphene ◽  
First Principles Calculation ◽  
Control Parameters ◽  
Graphene Growth ◽  
Initial Stage ◽  
The Stability

The energetics for the Si desorption and the C adsorption at a [11-20] step on SiC(0001) surface are studied using the first-principles calculation. It is found that the [11-20] step is stable and nonreactive. The stability of the step is thought to govern the surface morphology during the graphene formation. It is shown that the Si pressure and the temperature are the control parameters for the surface morphology and the graphene quality.

scholarly journals PEMANFAATAN ZEOLIT ALAM SEBAGAI MEDIA PENDUKUNG AMOBILISASI ENZIM α-AMILASE

2015 ◽  
Vol 5 (1) ◽  
pp. 79
Author(s):  
Upita Septiani ◽  
Agrina Lisma
Keyword(s):  
Surface Morphology ◽  
Unit Activity ◽  
Incubation Time ◽  
Natural Zeolite ◽  
Immobilized Enzyme ◽  
Natural Zeolites ◽  
Optimum Temperature ◽  
Optimal Activity ◽  
Immobilization Enzyme ◽  
The Stability

 ABSTRACT The utilization of natural zeolite as supporting media of α-amylase enzyme has been done. Natural zeolite which is activated with 3M HCl can remove impurities in the surface natural zeolite, uncover and widen the pores of the zeolite and activate functional groups to interact with α-amylase enzyme in the process of immobilization enzyme process. The mass of activated natural zeolite which is used as a material immobilized to get the optimal activity of α-amylase enzyme was 0.3 gram. Based on the measurement result of optimization of α-amylase enzyme were obtained optimum temperature of 35 oC, pH 5.6 and incubation time of 35 minutes with 0.04845 units/mL of the unit activity. And for α-amylase immobilized enzyme will be stable at the optimum temperature of 50 oC, pH 5.6 and incubation time of 45 minutes with 0.030 units/mL of the unit activity. SEM-EDX pattern shows the differences in surface morphology between natural zeolite and activated natural zeolites which contain α-amylase enzyme. A mobilization technique can increase the stability utilized in a α-amylase enzyme. Keywords : Zeolite, amobilization, α-amylase enzyme

Effect of Ammonia on CeO2 Microspheres Prepared by Internal Gelation Process

2018 ◽  
Vol 281 ◽  
pp. 9-14
Author(s):  
Xue Qiang Ding ◽  
Jing Tao Ma ◽  
Xing Yu Zhao ◽  
Shao Chang Hao ◽  
Chang Sheng Deng ◽  
...  
Keyword(s):  
Grain Size ◽  
Surface Morphology ◽  
Cerium Dioxide ◽  
Smooth Surface ◽  
Molar Ratio ◽  
Internal Gelation ◽  
Compact Structure ◽  
Gelation Process ◽  
The Stability

The internal gelation process was used to prepare cerium dioxide microspheres. The effect of ammonia on the stability of the precursor solutions was investigated with the NH3∙H2O/Ce (NH4)2(NO3)6 molar ratio from 0 to 1.25. The surface morphology and microstructure of the sintered CeO2 microspheres were analyzed. With the increase of NH3∙H2O/Ce (NH4)2(NO3)6 molar ratio, the solutions became more unstable, which indicated that their gelation was initiated. When the NH3∙H2O/Ce (NH4)2(NO3)6 ratio varied from 0 to 0.75, the surface of the microspheres became rougher and grain size became larger. Further increase in the NH3∙H2O/Ce (NH4)2(NO3)6 ratios to 1 and 1.25 led to CeO2 microspheres with smooth surface and compact structure.

Effect of Preparation-Induced Surface Morphology on the Stability of H-Terminated Si(111) and Si(100) Surfaces

2003 ◽  
Vol 92 ◽  
pp. 179-182 ◽  
Author(s):  
Heike Angermann ◽  
W. Henrion ◽  
M. Rebien ◽  
A. Röseler
Keyword(s):  
Surface Morphology ◽  
The Stability

Vacancies in solids and the stability of surface morphology

Nature ◽  
2001 ◽  
Vol 412 (6847) ◽  
pp. 622-625 ◽  
Author(s):  
K. F. McCarty ◽  
J. A. Nobel ◽  
N. C. Bartelt
Keyword(s):  
Surface Morphology ◽  
The Stability

scholarly journals Synthesis of Cellulose Stearate Ester as Wet Strength Agent for Synthesis of Bio-polybag from Oil Palm Empty Fruit Bunch

2021 ◽  
Vol 2 (2) ◽  
pp. 1-7
Author(s):  
Eddy Kurniawan ◽  
Rizka Mulyawan ◽  
Angga Tri Agusna PA ◽  
Wika Armadani ◽  
Zainuddin Ginting
Keyword(s):  
Surface Morphology ◽  
Water Content ◽  
Oil Palm ◽  
Methyl Stearate ◽  
Wet Strength ◽  
Physical Strength ◽  
Empty Fruit Bunches ◽  
Ft Ir ◽  
The Stability ◽  
Wavenumber Region

Biodegradable polybags are an alternative to overcome the weakness of synthetic polybags because of their degradation properties. Oil palm empty fruit bunches contain a lot of cellulose so that they can be used as a biodegradable polybag. Wet Strength serves to increase the physical strength of bio-polybags when exposed to water (in wet conditions) so that water content stability is required. In this study, Cellulose Stearate Esters were synthesized in an effort to increase the stability of the water content in bio-polybags. Cellulose Stearate Esters are synthesized through a transesterification reaction between -Cellulose isolated from Oil Palm Empty Fruit Bunches (EFB) with methyl stearate. The synthesis of cellulose stearate esters was carried out by refluxing for 2 hours using methanol solvent with various catalysts Na2CO3 5, 10, 15, 20 mg and with volume variations of methyl stearate 5, 10, 15. And the best variation was determined based on the degree of substitution test, namely with variations Na2CO3 catalyst 20 mg and volume of methyl Stearate 15 ml, amounting to 1.95. The result of the synthesis, namely cellulose stearate, was tested for functional groups by FT-IR spectroscopy and surface morphology using SEM. The formation of cellulose stearate is supported by the FT-IR spectrum in the wavenumber region of 3468.01 cm-1 indicating an OH group, 3062.96 cm-1 indicating a CH stretching group, 1695.43 cm-1 indicating a C=O group, cm-1 indicating a CH bending group, 1095.57cm-1 indicates a COC group, 609.51cm-1 indicates a (CH2)n>4 group. The results of surface morphology analysis using SEM showed that the surface of cellulose stearate looked homogeneous, more regular and had denser cavities than -Cellulose

scholarly journals Методы атомно-силовой микроскопии для исследования суперпротонных кристаллов

2020 ◽  
Vol 90 (11) ◽  
pp. 1843
Author(s):  
Р.В. Гайнутдинов ◽  
А.Л. Толстихина ◽  
Е.В. Селезнева ◽  
И.П. Макарова
Keyword(s):  
Atomic Force Microscopy ◽  
Surface Morphology ◽  
Ammonium Sulfate ◽  
Paraelectric Phase ◽  
Piezoelectric Response ◽  
Force Microscopy ◽  
Atomic Force ◽  
Microscopy Data ◽  
The Stability ◽  
First Time

Complex studies of new superprotonic crystals - acidic salts of potassium – ammonium sulfate (K1-x(NH4)x)3H(SO4)2, x ≥ 0.57 were carried out. Data on surface morphology, domain structure and conductivity of samples were obtained using atomic force microscopy. For the first time, the stability and degradation of the surface of superprotonic crystals were studied at the nanoscale. Based on piezoelectric response microscopy data, it was found that when the temperature decreased from 296 to 282 K, the (K0.43(NH4)0.57)3H(SO4)2 crystal transits from the paraelectric phase to the ferroelectric one.

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