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Online since: April 2019
Authors: Kuan Yew Cheong, Kean C. Aw, Khairunisak Abdul Razak, Soo Ai Ng
Controlling the size and structure of AuNPs is technologically important because of the strong correlation between these parameters with physical and chemical properties.
Methodology A memory device structure with AuNPs hydrothermally grown with varying hydrothermal reaction duration embedded in PMSSQ dielectric was fabricated.
For electrical property analysis, a second layer of PMSSQ 2 was spin-coated on the grown AuNPs and cured at 160 °C for 1 h to construct a sandwiched structure of embedded AuNPs in between the dielectric PMSSQ layer.
The diffraction peaks of Al template deposited by sputtering and evaporating obtained in Fig. 2a and 2b were observed at 38.45°, 44.71°, and 65.09°, which are ascribed to metallic Al [JCPDS No. 89-4037], and corresponded to the (111), (200), and (220) planes of the standard Al face centered cubic (FCC) structure, respectively.
Astruc, Gold nanoparticles: assembly, supramolecular chemistry, quantum-size-related properties, and applications toward biology, catalysis, and nanotechnology.
Methodology A memory device structure with AuNPs hydrothermally grown with varying hydrothermal reaction duration embedded in PMSSQ dielectric was fabricated.
For electrical property analysis, a second layer of PMSSQ 2 was spin-coated on the grown AuNPs and cured at 160 °C for 1 h to construct a sandwiched structure of embedded AuNPs in between the dielectric PMSSQ layer.
The diffraction peaks of Al template deposited by sputtering and evaporating obtained in Fig. 2a and 2b were observed at 38.45°, 44.71°, and 65.09°, which are ascribed to metallic Al [JCPDS No. 89-4037], and corresponded to the (111), (200), and (220) planes of the standard Al face centered cubic (FCC) structure, respectively.
Astruc, Gold nanoparticles: assembly, supramolecular chemistry, quantum-size-related properties, and applications toward biology, catalysis, and nanotechnology.
Online since: December 2019
Authors: Elin Karlina, Kosterman Usri, Renny Febrida, Camellia Panatarani, I Made Joni, Yunita Fatmala
Introduction
The ultimate goal of dental restorative materials is to replace the biological, functional and esthetic properties of healthy tooth structure.
Figure 2(b) shows the XRD spectra of the natural zircon sand filler, it showed that the percentage of weight fraction of rhombohedral alumina is 65.3% and tetragonal zirconium silicate phase is 34.7% instead the structure crystalline required for good mechanical properties is tetragonal zirconia phase.
Zirconia with tetragonal phase crystalline structure was a stable phase and will enhance the transformation toughening [17,18].
No tetragonal phase structure zirconia crystals in this prototype composite filler may affect the mechanical properties.
Kleczewska, Material Aspects of Exploitation of Dental Composites Based on Dimethacrylate Resins, Thesis.Technical University of Lodz Departement of Chemistry Institute of Polymer and Dye Technology, 2011, pp.15-39
Figure 2(b) shows the XRD spectra of the natural zircon sand filler, it showed that the percentage of weight fraction of rhombohedral alumina is 65.3% and tetragonal zirconium silicate phase is 34.7% instead the structure crystalline required for good mechanical properties is tetragonal zirconia phase.
Zirconia with tetragonal phase crystalline structure was a stable phase and will enhance the transformation toughening [17,18].
No tetragonal phase structure zirconia crystals in this prototype composite filler may affect the mechanical properties.
Kleczewska, Material Aspects of Exploitation of Dental Composites Based on Dimethacrylate Resins, Thesis.Technical University of Lodz Departement of Chemistry Institute of Polymer and Dye Technology, 2011, pp.15-39
Online since: December 2015
Authors: Rozana Mohd Dahan, Mohamad Hafiz Mohd Wahid, Adillah Nurashikin Arshad, Muhamad Naiman Sarip, Mohamad Rusop Mahmood
PVDF were known for its polymorphism structures, consisting of four crystal phases known as α-, β-, γ-, and δ-phase.
Amongst this polymorphism, β-crystal of PVDF is the most desired structure due to its large dipole moment.
MgO is inorganic filler with cubic structure, has an excellent property such as chemical inertness, electrical insulation, and high temperature stability as well as high thermal conductivity [10].
MIM structure of PVDF/MgO (7%) Nanocomposite Results and discussion Field Emission Scanning Electron Microscopy (FESEM).
Materials Chemistry and Physics, 2013. 142(2–3): p. 469-478
Amongst this polymorphism, β-crystal of PVDF is the most desired structure due to its large dipole moment.
MgO is inorganic filler with cubic structure, has an excellent property such as chemical inertness, electrical insulation, and high temperature stability as well as high thermal conductivity [10].
MIM structure of PVDF/MgO (7%) Nanocomposite Results and discussion Field Emission Scanning Electron Microscopy (FESEM).
Materials Chemistry and Physics, 2013. 142(2–3): p. 469-478
Online since: March 2017
Authors: Long Wei, Bao Yi Wang, Xing Zhong Cao, Jing Yang, Run Sheng Yu
Since the structure of PVC contains chlorine atoms, which are related to a special positron annihilation mechanism [8], PVC can also be served as a good carrier for positron study.
In polymer studies, the most commonly used reference sample is LDPE, which consists of only carbon and hydrogen atoms in its molecule and has linear structure [13, 14].
The disagreement between CDB results and FTIR results indicates that it is not rationable to use LDPE as a reference sample to analyze gamma irradiation effect on UPVC, since in irradiated samples, the effect of oxygen atoms which are introduced by the gamma irradiation may be drowned by the effect of the chlorine atoms originally existing in the polymer structure.
While PP, with similar chemical structure to LDPE, shows similar CDB curve shape at the low momentum part (~1) and the level of the high-momentum part corresponds to the fraction of positrons that annihilate as free particles [15].
Principles and applications of positron & positronium chemistry.
In polymer studies, the most commonly used reference sample is LDPE, which consists of only carbon and hydrogen atoms in its molecule and has linear structure [13, 14].
The disagreement between CDB results and FTIR results indicates that it is not rationable to use LDPE as a reference sample to analyze gamma irradiation effect on UPVC, since in irradiated samples, the effect of oxygen atoms which are introduced by the gamma irradiation may be drowned by the effect of the chlorine atoms originally existing in the polymer structure.
While PP, with similar chemical structure to LDPE, shows similar CDB curve shape at the low momentum part (~1) and the level of the high-momentum part corresponds to the fraction of positrons that annihilate as free particles [15].
Principles and applications of positron & positronium chemistry.
Online since: April 2010
Authors: Ulrich Starke, Takayuki Iwasaki, Christian Riedl, Camilla Coletti
This interface or buffer
layer is constituted of carbon atoms which are arranged in a graphene-like honeycomb structure.
The deposition of F4-TCNQ molecules can even proceed by wet chemistry, which makes this method application friendly and technologically relevant.
To demonstrate the electronic effect of the hydrogen treatment process Figures 3 (a)-(f) show the valence band structure around the K-point of the graphene Brillouin zone as measured by ARPES.
The hydrogen treated samples are robust since outgassing at 400 ◦C as carried out for the spectrum shown in panel (b) has no effect on the π-band structure.
At around 900 ◦C the zerolayer structure is completely re-established as confirmed by ARPES and LEED (not shown), which demonstrates that the hydrogen intercalation process is fully reversible.Since conventional monolayer epitaxial graphene is the first graphene layer on top of the interface layer (Fig. 1 and Fig. 3 (d)) the process of hydrogen intercalation leads to its transformation into bilayer graphene.
The deposition of F4-TCNQ molecules can even proceed by wet chemistry, which makes this method application friendly and technologically relevant.
To demonstrate the electronic effect of the hydrogen treatment process Figures 3 (a)-(f) show the valence band structure around the K-point of the graphene Brillouin zone as measured by ARPES.
The hydrogen treated samples are robust since outgassing at 400 ◦C as carried out for the spectrum shown in panel (b) has no effect on the π-band structure.
At around 900 ◦C the zerolayer structure is completely re-established as confirmed by ARPES and LEED (not shown), which demonstrates that the hydrogen intercalation process is fully reversible.Since conventional monolayer epitaxial graphene is the first graphene layer on top of the interface layer (Fig. 1 and Fig. 3 (d)) the process of hydrogen intercalation leads to its transformation into bilayer graphene.
Online since: December 2012
Authors: Ji Yao Guo, Xiao Cai Yu, Dong Dong Hu, Kui Sheng Song, Xu Zheng
The crystal structure of the nano- ZnO was determined by X-ray diffraction (XRD).
In this study, it had been observed that all samples exhibited a hexagonal structure in accordance with the JCPDS database of card number 36–1451 in Fig.
The XRD and SEM of catalyst suggested that the crystal structure of the photocatalysts remained in the hexagonal system form.
Electronic structure and processes.
Chemistry of semiconductor nanoparticles.
In this study, it had been observed that all samples exhibited a hexagonal structure in accordance with the JCPDS database of card number 36–1451 in Fig.
The XRD and SEM of catalyst suggested that the crystal structure of the photocatalysts remained in the hexagonal system form.
Electronic structure and processes.
Chemistry of semiconductor nanoparticles.
Online since: June 2011
Authors: M.R. Mahmoudian, Yatimah Alias, Wan Jefrey Basirun
Basirun3
123Department of Chemistry .university of Malaya, Kuala Lumpur 50603, Malaysia
M_R_mahmoudian@yahoo.com, yatimah70@um.edu ,wjeffreyb@yahoo.com
Key words: Polyaniline; Steel; Electrodeposition; Corrosion
Abstract.
It is reported by various authors that the nature of the anions affects the PAni structure [10, 14].
Two different types of PAni morphology in oxalic acid electrolyte were mainly observed; the fibre and the nodular structures.
As can be seen, the morphology of PAni in pH1.55 is fibre form, while the nodular structures were observed in pH 2.53, 3.5.
The morphology of synthesized PAni at 0.03Vs-1 is between the fibre and the nodular structures.
It is reported by various authors that the nature of the anions affects the PAni structure [10, 14].
Two different types of PAni morphology in oxalic acid electrolyte were mainly observed; the fibre and the nodular structures.
As can be seen, the morphology of PAni in pH1.55 is fibre form, while the nodular structures were observed in pH 2.53, 3.5.
The morphology of synthesized PAni at 0.03Vs-1 is between the fibre and the nodular structures.
Online since: February 2014
Authors: Ying Gong, Bei Qing Huang, Xian Fu Wei
Analysis of resin and pigment disposal mechanism shows that different resin has different chemical structure which may differ in the affinity to the pigment surface modifier [10].
When the ink is exposure to the external force, the inner structure will be damaged, and the links between the pigment and binder become weak, which give the resin molecule freedom to move.
This might be the cause of different samples having diverse binders which have different condensed structures.
Different types of resins, due to their different chemical structures, differ in the adhesion between ink resins and the substrates.
Chemistry World, 2005(6):344-348
When the ink is exposure to the external force, the inner structure will be damaged, and the links between the pigment and binder become weak, which give the resin molecule freedom to move.
This might be the cause of different samples having diverse binders which have different condensed structures.
Different types of resins, due to their different chemical structures, differ in the adhesion between ink resins and the substrates.
Chemistry World, 2005(6):344-348
Online since: December 2012
Authors: Ali Salehabadi, Mohamad Abu Bakar
The growth of crystal structure from polymer solutions is found in polymers crystallized from the melt [19].
The number, size and fine structure of spherulites depend on the temperature of crystallization.
This means the large structure form near Tm whereas greater number of small spherulites grows at lower temperature near Tc.
Zhijiang and coworkers [22] were expressed that PHB crystallizes in an orthorhombic lattice structure.
Avérous, Macromolecular Chemistry and Physics: Vol. 209 (2008), P. 1473-1484
The number, size and fine structure of spherulites depend on the temperature of crystallization.
This means the large structure form near Tm whereas greater number of small spherulites grows at lower temperature near Tc.
Zhijiang and coworkers [22] were expressed that PHB crystallizes in an orthorhombic lattice structure.
Avérous, Macromolecular Chemistry and Physics: Vol. 209 (2008), P. 1473-1484
Online since: October 2011
Authors: H. Nourbakhsh, R. Mohammadzadeh, M. Rafiee, R. Rafiee
In these experimental works, the microscale structures studied may be copper wires, silver single crystal, nickel beams, or epoxy polymeric beams.
Thundat, Glucose biosensor based on the microcantilever, Analytical Chemistry 76 (2004) 292–297
Wang, Size-dependent vibration characteristics of microtubes conveying fluid, Journal of Fluids and Structures, in press. doi:10.1016/ j.jfluidstructs.2010.02.005
Mindlin, Micro-structure in linear elasticity, Archive for Rational Mechanics and Analysis 16 (1964) 51–78
Tong, Couple stress based strain gradient theory for elasticity, International Journal of Solids and Structures 39 (2002) 2731–2743
Thundat, Glucose biosensor based on the microcantilever, Analytical Chemistry 76 (2004) 292–297
Wang, Size-dependent vibration characteristics of microtubes conveying fluid, Journal of Fluids and Structures, in press. doi:10.1016/ j.jfluidstructs.2010.02.005
Mindlin, Micro-structure in linear elasticity, Archive for Rational Mechanics and Analysis 16 (1964) 51–78
Tong, Couple stress based strain gradient theory for elasticity, International Journal of Solids and Structures 39 (2002) 2731–2743