Size-dependent melting thermodynamics of nanorods in theory and experiment

2019 ◽  
Vol 21 (48) ◽  
pp. 26549-26556 ◽  
Author(s):  
Xinru Song ◽  
Hongxing Li ◽  
Zixiang Cui ◽  
Yongqiang Xue ◽  
Jianhua Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Size Dependent ◽  
Melting Thermodynamics ◽  
Theory And Experiment

Compared with other morphological nanomaterials, nanorods have many unique properties that are closely related to their thermal stability.

Size-dependent melting thermodynamic properties of selenium nanowires in theory and experiment

CrystEngComm ◽  
2019 ◽  
Vol 21 (3) ◽  
pp. 430-438 ◽  
Author(s):  
Jianhua Zhang ◽  
Qingshan Fu ◽  
Zixiang Cui ◽  
Yongqiang Xue
Keyword(s):  
Thermodynamic Properties ◽  
Size Effect ◽  
Core Shell ◽  
Size Dependent ◽  
Selenium Nanowires ◽  
Melting Thermodynamics ◽  
Theory And Experiment

A new core–shell melting model of nanowires was proposed to explain the size effect on the melting thermodynamics of nanowires.

Influence of an exocyclic guanine adduct on the thermal stability, conformation, and melting thermodynamics of a DNA duplex

Biochemistry ◽  
1992 ◽  
Vol 31 (48) ◽  
pp. 12096-12102 ◽  
Author(s):  
G. Eric Plum ◽  
Arthur P. Grollman ◽  
Frances Johnson ◽  
Kenneth J. Breslauer
Keyword(s):  
Thermal Stability ◽  
Dna Duplex ◽  
Melting Thermodynamics

scholarly journals Entrapment of α-Amylase in Agar Beads for Biocatalysis of Macromolecular Substrate

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Manu Sharma ◽  
Vinay Sharma ◽  
Dipak K. Majumdar
Keyword(s):  
Thermal Stability ◽  
Half Life ◽  
Thermal Inactivation ◽  
Scale Up ◽  
Physical Stability ◽  
Entrapment Efficiency ◽  
Substrate Affinity ◽  
Michaelis Constant ◽  
Size Dependent ◽  
Temperature Optima

Attempts have been made to optimize immobilization parameters, catalytic property, and stability of immobilized α-amylase in agar. The work compares natural entrapment efficiency of agar with the ionotropically cross-linked agar hydrogel, with the advantage of easy scale-up and cost and time effectiveness. Beads prepared with 3% (w/v) agar and 75 mM calcium chloride and hardened for 20 minutes were selected for further studies on the basis of entrapment efficiency (80%) and physical stability. Following entrapment, pH and temperature optima of enzyme were shifted from 6 to 6.5 and 50 to 55°C, respectively. Michaelis constant (Km) for both free and entrapped enzymes remained the same (0.83%) suggesting no change in substrate affinity. However, Vmax⁡ of entrapped enzyme decreased ~37.5-fold. The midpoint of thermal inactivation for entrapped enzyme increased by 8 ± 1°C implying its higher thermal stability. The entrapped enzyme in calcium agar bead had an Ea value of 27.49 kcal/mol compared to 17.6 kcal/mol for free enzyme indicating increased stability on entrapment. Half-life of enzyme increased ~2.2 times after entrapment in calcium agar at 60°C indicating stabilization of enzyme. The reusability of beads was size dependent. Beads with diameter <710 μm were stable and could be reused for 6 cycles with ~22% loss in activity.

Curvature-dependent melting models and melting thermodynamics of nanotubes in theory and experiment

2020 ◽  
Vol 216 ◽  
pp. 115558
Author(s):  
Xing Yu ◽  
Zixiang Cui ◽  
Yongqiang Xue ◽  
Jianhua Zhang ◽  
Hongxing Li ◽  
...  
Keyword(s):  
Melting Thermodynamics ◽  
Theory And Experiment

SIZE-DEPENDENT EQUATION OF STATE FOR NANOMATERIALS

2012 ◽  
Vol 11 (01) ◽  
pp. 1250010
Author(s):  
ARCHANA BHATT ◽  
MUNISH KUMAR
Keyword(s):  
Particle Size ◽  
Equation Of State ◽  
Size Dependence ◽  
Theoretical Method ◽  
Particle Sizes ◽  
Isothermal Compression ◽  
Compression Curve ◽  
Size Dependent ◽  
Theory And Experiment ◽  
Good Agreement

Simple theoretical method is developed to study the size dependence of equation of state of nanomaterials. The isothermal compression of Ni and ε- Fe has been computed for different particle sizes. A shift in compression curve is obtained by increasing the particle size. This demonstrates the softening of the material by increasing the particle size. For larger particle size (~100 nm) the compression curve resembles with that of the bulk. This demonstrates that the nanomaterial becomes bulk for larger particle size. The results have been compared with the available experimental data. A good agreement between theory and experiment demonstrates the validity of the method proposed in the present paper.

Thermal stability of TPA template and size-dependent selectivity of uncalcined TS-1 supported Au catalyst for propene epoxidation with H2 and O2

RSC Advances ◽  
2016 ◽  
Vol 6 (50) ◽  
pp. 44050-44056 ◽  
Author(s):  
X. Feng ◽  
D. Chen ◽  
X. G. Zhou
Keyword(s):  
Thermal Stability ◽  
Reaction Temperature ◽  
Formation Rate ◽  
Au Catalyst ◽  
Size Dependent ◽  
Thermal Stability Of

An Au/TS-1-B catalyst, whose internal TPA template is stable below 350 °C, shows volcano-shaped activity with reaction temperature and reaches a noteworthy PO formation rate (220 gPO h−1 kgCat−1) at 260 °C. Moreover, intrinsic size-dependent selectivity is also studied.

Size-dependent dissolution kinetics of CaCO3 nanoparticles in theory and experiment

2016 ◽  
Vol 52 (8) ◽  
pp. 4412-4420 ◽  
Author(s):  
Aijie Yan ◽  
Yongqiang Xue ◽  
Zixiang Cui ◽  
Zhi Zhang ◽  
Shanshan Wang
Keyword(s):  
Dissolution Kinetics ◽  
Size Dependent ◽  
Caco3 Nanoparticles ◽  
Kinetics Of ◽  
Theory And Experiment

THERMAL STABILITY OF ENERGY-EMISSION FROM CdTe NANOCRYSTALS EMBEDDED IN SiO2 THIN FILMS

2010 ◽  
Vol 24 (29) ◽  
pp. 2837-2843
Author(s):  
S. LEVICHEV ◽  
A. CHAHBOUN ◽  
A. G. ROLO ◽  
O. CONDE ◽  
M. J. M. GOMES
Keyword(s):  
Thin Films ◽  
Thermal Stability ◽  
Grazing Incidence ◽  
Silica Matrix ◽  
X Ray Diffraction ◽  
Light Emitting ◽  
Temperature Range ◽  
Size Dependent ◽  
Energy Emission ◽  
Cdte Nanocrystals

CdTe -doped SiO 2 thin films were produced by RF magnetron co-sputtering technique. Presence of CdTe nanocrystals inside the silica matrix was confirmed by Raman spectroscopy and grazing incidence X-ray diffraction. The samples demonstrate size dependent photoluminescence. Temperature dependent photoluminescence measurements were carried out in the temperature range 15–295 K and revealed energy-emission thermal stability. This feature can be usefully applied in a production of light-emitting diodes with wavelength stability in a wide temperature range.

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