Formation of TiO2/natural Melanin Nanostructure Hybrids with Enhanced Optical and Thermal Properties

Abstract Recently, with the progress of research in amending and developing the properties of inorganic materials, researchers have become focused on using inexpensive and environmentally friendly materials such as organic materials from natural sources that have proven effective in improving the properties of materials in various applications. In recent years, melanin has become an attractive topic for researchers due to its distinctive structural properties that have been distinguished in various application fields. Here, we report the use of ultrasonication under UV radiation for synthesis. The influence of natural melanin on the structural, optical and thermal properties of TiO2 nanoparticles was investigated by using Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA) and UV–Vis spectroscopy. It was observed that incorporating natural melanin on TiO2 nanoparticles (TiO2-Mel) occurred at approximately 2.01 eV with low value of Urbach energy around 100 meV indicates improvement in crystalline structure. Thermal results showed that TiO2-Mel is stable even with temperatures up to 400°C. According to the results obtained by the thermal stability of melanin with titanium dioxide can makes it a good candidate in many application such as solar cells and optoelectronic that require optical efficiency and thermal stability for long periods.

Preparation and Thermal Properties of High-Purified Molten Nitrate Salt Materials with Heat Transfer and Storage

High Temperature Materials and Processes ◽

10.1515/htmp-2014-0147 ◽

2015 ◽

Vol 34 (8) ◽

Cited By ~ 2

Author(s):

Hongtao Zhang ◽

Youjing Zhao ◽

Jingli Li ◽

Lijie Shi ◽

Min Wang

Keyword(s):

Heat Transfer ◽

Thermal Stability ◽

Thermal Properties ◽

Molten Salts ◽

Operating Temperature ◽

Nitrate Salt ◽

Solar Salt ◽

And Storage ◽

Thermal Stability Of ◽

Operating Temperature Range

AbstractThis paper focuses on thermal stability of molten salts, operating temperature range and latent heat of molten salts at a high temperature. In this experiment, multi-component molten salts (purified Solar Salt) composed of purified NaNO

The Thermal Properties of Polyurethane/Neoprene Blends on Prosthetic Foot

Materials Science Forum ◽

10.4028/www.scientific.net/msf.990.106 ◽

2020 ◽

Vol 990 ◽

pp. 106-110

Author(s):

Mohd Zulkifli Mohamad Noor ◽

Mohamad Anas Mohd Azmi ◽

Mohd Shaiful Zaidi Mad Desa ◽

Mohd Bijarimi Mat Piah ◽

Azizan Ramli

Keyword(s):

Thermal Stability ◽

Thermal Properties ◽

Low Cost ◽

Decomposition Temperature ◽

Gravimetric Analysis ◽

Thermal Gravimetric ◽

Prosthetic Foot ◽

Reinforced Polymer ◽

New Material ◽

Neoprene reinforced polymer has become an attraction in current research and development of new material blend. In this invention, neoprene was chosen to be enhance to polyurethane because of their superior properties that possess extraordinary mechanical, electrical, optical and thermal properties on prosthetic foot. In this research, polyurethane was chosen due to good rigidity, easy processing and low cost. The reinforcement polyurethane with neoprene is expected to improve the properties of polyurethane. The objective of this research was conducted to investigate the effect of neoprene contents on thermal properties of polyurethane reinforced neoprene on prosthetic foot. The effect of neoprene on thermal properties neoprene reinforced polyurethane was analysed in term of its thermal stability by thermal gravimetric analysis (TGA). Moreover, the visual of small topographic details on the surface of polyurethane/neoprene blends will be examined by scanning electron microscope (SEM). Based on result, the thermal properties show the great enhancement at high neoprene contents which is 1.0wt%. The thermal stability of polyurethane reinforced neoprene improves when the temperature where decomposition starts to occurs are higher than decomposition temperature of pure polyurethane. Then, thermal conductivity of polyurethane shows the great improvement after the addition of neoprene. Lastly, the smooth surface and visible of sheets pattern on surface represent the present of neoprene disperse into polymer that enhance brittleness. Thus, the presence of neoprene has clearly enhanced the thermal stability of the polyurethane. Table 1 shows formulation of neoprene and polyurethane.

Epoxy Cured with Anhydride Terminated Polydimethylsiloxane: Cure Kinetics and Thermal Properties

10.4028/www.scientific.net/amr.415-417.261 ◽

2011 ◽

Vol 415-417 ◽

pp. 261-264

Author(s):

Yuan Ren ◽

Zheng Xi ◽

Wen Jun Gan ◽

Liang Zhang ◽

Jing Zhang ◽

...

Keyword(s):

Activation Energy ◽

Thermal Stability ◽

Thermal Properties ◽

Succinic Anhydride ◽

Cure Kinetics ◽

Diglycidyl Ether ◽

Scanning Calorimetry ◽

Thermogravimetric Analyses ◽

Isothermal Measurements ◽

A siloxane-containing dianhydride, succinic anhydride terminated polydimethylsiloxane (DMS-Z21) was selected to cure diglycidyl ether of bisphenol-A based epoxy resin (DGEBA). The cure kinetics and thermal properties were investigated by nonisothermal and isothermal differential scanning calorimetry (DSC) and thermogravimetric analyses (TGA), respectively. The activation energy (Ea) of the curing reaction was obtained based on the methods of Kissinger and isothermal measurements. The results of the thermogravimetric analyses of the DGEBA/DMS-Z21 system showed that the thermal stability of the DGEBA/DMS-Z21 system was slightly higher than the DGEBA/MeTHPA system.

Morphology, Mechanical and Thermal Properties of Poly(Lactic Acid)/Propylene-Ethylene Copolymer/Cellulose Composites

Materials Science Forum ◽

10.4028/www.scientific.net/msf.972.172 ◽

2019 ◽

Vol 972 ◽

pp. 172-177

Author(s):

Sirirat Wacharawichanant ◽

Patteera Opasakornwong ◽

Ratchadakorn Poohoi ◽

Manop Phankokkruad

Keyword(s):

Thermal Stability ◽

Lactic Acid ◽

Thermal Properties ◽

Tensile Stress ◽

Cellulose Fibers ◽

Phase Morphology ◽

Poly Lactic Acid ◽

Mechanical And Thermal Properties ◽

Ethylene Copolymer ◽

This work studied the effects of various types of cellulose fibers on the morphology, mechanical and thermal properties of poly(lactic acid) (PLA)/propylene-ethylene copolymer (PEC) (90/10 w/w) blends. The PLA/PEC blends before and after adding cellulose fibers were prepared by melt blending method in the internal mixer and molded by compression method. The morphological analysis observed that the presence of cellulose in PLA did not change the phase morphology of PLA, and PLA/cellulose composite surfaces were observed the cellulose fibers inserted in PLA matrix and fiber pull-out. The phase morphology of PLA/PEC blends was changed from brittle fracture to ductile fracture behavior and showed the phase separation between PLA and PEC phases. The presence of celluloses did not improve the compatibility between PLA and PEC phases. The tensile stress and strain curves found that the tensile stress of PLA was the highest value. The addition of all celluloses increased Young’s modulus of PLA. The PEC presence increased the tensile strain of PLA over two times when compared with neat PLA and PLA was toughened by PEC. The incorporation of cellulose fibers in PLA/PEC blends could improve Young’s modulus, tensile strength, and stress at break of the blends. The thermal stability showed that the degradation temperatures of all types of cellulose were less than the degradation temperatures of PLA. Thus, the incorporation of cellulose in PLA could not enhance the thermal stability of PLA composites and PLA/PEC composites. The degradation temperature of PEC was the highest value, but it could not improve the thermal stability of PLA. The incorporation of cellulose fibers had no effect on the melting temperature of the PLA blend and composites.

Effects of Microcrystalline Cellulose on the Thermal Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate)

10.4028/www.scientific.net/amr.284-286.1778 ◽

2011 ◽

Vol 284-286 ◽

pp. 1778-1781 ◽

Cited By ~ 5

Author(s):

Zhe Zhou ◽

Hou Yong Yu ◽

Mei Fang Zhu ◽

Zong Yi Qin

Keyword(s):

Thermal Stability ◽

Thermal Properties ◽

Microcrystalline Cellulose ◽

Crystallization Temperature ◽

Solvent Casting ◽

Melt Crystallization ◽

Casting Method ◽

Nucleation Agent ◽

Tga And Dsc ◽

The composites of poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) with different microcrystalline cellulose (MCC) contents were prepared by a solvent casting method. The effects of MCC on the thermal properties of PHBV were studied by TGA and DSC. The DSC results showed that the melt crystallization temperature of the PHBV/MCC increased from 41.9 °C for PHBV to 59.8 °C for the composites containing 20 wt. % MCC, which indicated that the crystallization of PHBV became easier with the addition of MCC. It also illustrated that the MCC could be used as an effective nucleation agent for the crystallization of PHBV. Moreover, it was found that the thermal stability of the PHBV/MCC composites increased compared with the neat PHBV.

Luminescent and Thermal Properties of Eu3+ Complex with Salicylic Acid and o-Phenanthroline Trapped in Sol–Gel Glass

10.4028/www.scientific.net/amr.239-242.294 ◽

2011 ◽

Vol 239-242 ◽

pp. 294-297

Author(s):

Cun Jin Xu ◽

Qun Lü ◽

Hai Ke Feng

Keyword(s):

Thermal Stability ◽

Salicylic Acid ◽

Thermal Properties ◽

Silica Gel ◽

Sol Gel ◽

Silica Matrix ◽

Emission Lines ◽

Excitation Spectra ◽

Thermal Stability Of ◽

Luminescence Behavior

A ternary Eu(III) complex with salicylic acid (Hsal) ando-phenanthroline (phen) was synthesized and then incorporated into silica matrix by sol-gel method. The luminescence behavior of the complex in silica gel was studied compared with that of the pure complex by means of emission, excitation spectra and thermogravimetic analysis. The results indicate that the complex Eu(sal)3(phen) in silica gel shows fewer emission lines than pure Eu(sal)3(phen) and the luminescence intensity ratio of the5D0→7F2transition to the5D0→7F1transition is lower than that of the latter. The thermal stability of Eu(sal)3(phen) is enhanced greatly through the introduction of the complex into silica matrix.

Study on the thermal stability of Controlled Permeability Formwork

10.4028/www.scientific.net/amr.374-377.1426 ◽

2011 ◽

Vol 374-377 ◽

pp. 1426-1429

Author(s):

Xiao Meng Guo ◽

Jian Qiang Li ◽

Xian Sen Zeng ◽

De Dao Hong

Keyword(s):

Thermal Stability ◽

Thermal Properties ◽

Dynamic Mechanical Analysis ◽

Thermo Gravimetric Analysis ◽

Mechanical Analysis ◽

Gravimetric Analysis ◽

Construction Work ◽

Thermo Gravimetric ◽

Excellent Thermal Stability ◽

In this study, the thermal properties of a kind of new geotextile materials, so called controlled permeable formwork (CPF), were studied. Thermo-gravimetric analysis showed that the weight of CPF didn’t change much between 0~350 °C. Dynamic mechanical analysis showed that the storage modulus of CPF reduced from 25 MPa to around 10 MPa when the temperature rose to above 100 °C. The strength of sample decreased slightly with the increase of the temperature. The breaking elongation changed slightly with a maximum at 80 °C. The CPF showed excellent thermal stability and was suitable for general use in construction work.

Effects of Kenaf and Rice Husk on Thermal Properties of Kenaf/CaCO3/HDPE and Rice Husk/CaCO3/HDPE Hybrid Composites

10.4028/www.scientific.net/amr.748.201 ◽

2013 ◽

Vol 748 ◽

pp. 201-205

Author(s):

Abd Aziz Noor Zuhaira ◽

Rahmah Mohamed

Keyword(s):

Thermal Stability ◽

Thermal Properties ◽

Rice Husk ◽

Natural Fiber ◽

Hybrid Composites ◽

Degree Of Crystallinity ◽

Differential Scanning Calorimetric ◽

Kenaf Fiber ◽

Twin Screw ◽

In this research, rice husk and kenaf fiber were compounded with calcium carbonate (CaCO3)/high density polyethylene (HDPE) composite.Different loadings of up to 30 parts of 50 mesh sizes of rice husk particulate and kenaf fiber were compounded using twin-screw extruder with fixed 30 parts of CaCO3 fillerto produce hybrid composites of rice husk/CaCO3/HDPE and kenaf/CaCO3/HDPE.Compounded hybrid composites were prepared and tested for thermal properties. The thermal stability of the components was examined by thermogravimetricanalysis (TGA) and differential scanning calorimetric (DSC). The DSC results showed a slightly changes in melting temperature (Tm), crystallization temperature (Tc) and the degree of crystallinity (Xc) with addition of natural fiber. TGA indicates thermal stability of hybrid composite filled with kenaf or rice husk is better than unfilledCaCO3/HDPE composite.

Evaluation of Thermal Properties of the Fe80Cr20 Nanostructure for Interconnect Application in High Temperature

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.815.193 ◽

2015 ◽

Vol 815 ◽

pp. 193-197 ◽

Cited By ~ 1

Author(s):

Abdul Mutalib Leman ◽

Dafit Feriyanto ◽

M.N.M. Salleh ◽

Ishak Baba

Keyword(s):

Thermal Stability ◽

Thermal Properties ◽

High Temperature ◽

Raw Material ◽

Ultrasonic Technique ◽

Material Combination ◽

X Ray ◽

Combination Technique ◽

Eds Analysis ◽

Metallic Fe80Cr20 alloy in thermal stability analysis is investigated. Approached method is combination technique (milled and UT) of ball milling (milled) combined with ultrasonic technique (UT) which is not yet fully explored. From Energy Dispersive x-ray Spectroscopy (EDS) analysis resulted that the composition of 80 wt% Fe and 20 wt% Cr in individual particle was achieved at milled and UB 4.5 h sample. Higher thermal stability of treated samples approximately 63% at 1100 °C temperature operation which showed by milled and UT at 4.5 h when compared to raw material. Combination technique shown high prospect to advance exploration in improving thermal stability which suitable for interconnect application.

Thermal stability of segmented polyurethane elastomers reinforced by clay particles

Hemijska industrija ◽

10.2298/hemind0906621p ◽

2009 ◽

Vol 63 (6) ◽

pp. 621-628 ◽

Cited By ~ 1

Author(s):

Jelena Pavlicevic ◽

Jaroslava Budinski-Simendic ◽

Mészáros Szécsényi ◽

Nada Lazic ◽

Milena Spirkova ◽

...

Keyword(s):

Thermal Stability ◽

Thermal Properties ◽

Chain Extender ◽

Hexamethylene Diisocyanate ◽

Scanning Calorimetry ◽

Modulated Differential Scanning Calorimetry ◽

Polyurethane Elastomers ◽

Oh Groups ◽

Clay Nanoparticles ◽

The aim of this work was to determine the influence of clay nanoparticles on thermal properties of segmented polyurethanes based on hexamethylene- diisocyanate, aliphatic polycarbonate diol and 1,4-butanediol as chain extender. The organically modified particles of montmorillonite and bentonite were used as reinforcing fillers. The structure of elastomeric materials was varied either by diol type or chain extender content. The ratio of OH groups from diol and chain extender (R) was either 1 or 10. Thermal properties of prepared materials were determined using modulated differential scanning calorimetry (MDSC). Thermal stability of obtained elastomers has been studied by simultaneously thermogravimetry coupled with DSC. The glass transition temperature, Tg, of soft segments for all investigated samples was about -33?C. On the basis of DTG results, it was concluded that obtained materials were very stable up to 300?C.