PENGEMBANGAN PAPAN PEREDAM BUNYI MELALUI MODIFIKASI NANO SILIKAT AMPAS TEBU PG KREMBOENG DENGAN TEMPLATE SERAT SABUT KELAPA

Manusia memiliki batas kemampuan mendengar suara pada rentang hingga 140 dB, lebih daripada itu akan terjadi kerusakan pada organ-organ dalam gendang telinga. Ampas tebu PG Kremboeng mengandung 70,97% silikat murni yang berpotensi memberikan penguatan pada papan serat dan meningkatkan performa serap bunyi. Metode yang digunakan untuk sintesis nano silikat ampas tebu dilakukan dengan cara Pretreatment BBA, tukar kation silikat, dan pencucian gel kering. Komponen silikat dan produk lain dalam ampas tebu ditentukan menggunakan difraksi sinar-X (XRD). Morfologi xerogels nano silikat dan papan serat telah diteliti dengan menggunakan Scanning Electron Microscopy (SEM). Daya serap ditentukan dari berat sebelum dan sesudah perendaman dalam air 24 jam. Pengujian keteguhan patah dan Modulus of Elasticity dilakukan dengan Universal Testing Machine. Uji Internal Bond direkatkan pada dua buah blok alumunium dengan perekat besi dan dibiarkan mengering. Koefisien serap diukur dengan sound level meter. Berdasarkan pola XRD, dapat diketahui bahwa terdeteksi medium silicate hydroxide. Berdasarkan mikrograf SEM dapat diketahui suatu struktur bongkahan yang memanjang halus terdiri atas kumpulan-kumpulan partikel nano silikat pada papan dengan template serat sabut kelapa. Sampel terbaik dalam penelitian ini adalah I (60%;17%;23%) dengan nilai DSA 82,38%, MOR 102,84 kg/cm2, MOE 11.228,52 kg/cm2, dan IB 0,83 kg/cm2. Interval nilai koofisien serap taraf intensitas bunyi antar sampel adalah 0,527 < x < 1,000 pada pagi hari, 0,544 < x < 1,000 pada siang hari, dan 0,538 < x < 1,000 pada malam hari. Sehingga secara keseluruhan interval pada segala kondisi waktu adalah 0,527 < x < 1,000.

Download Full-text

Studies on Friction and Mechanical Properties of High Density Polypropylene (HDPP) Filled with Modified Talc

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.624.279 ◽

2012 ◽

Vol 624 ◽

pp. 279-282

Author(s):

Feng Zhan ◽

Nan Chun Chen

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Lamellar Structure ◽

Testing Machine ◽

High Density ◽

Impact Testing ◽

Wear Testing ◽

Frictional Surface ◽

Universal Testing ◽

Scanning Electron

Talc was modified by aluminate coupling agent (ACA) before filling it into high density polypropylene (HDPP) to prepare talc/HDPP composites. Scanning electron microscopy (SEM), wear testing machine, electronic universal testing machine, and impact testing machine were used to analyze the surface modification and the effects of modified talc on friction and mechanical properties of modified talc/HDPP composites. The results indicate that after modified the lamellar structure of talc particles are open and the dispersion of particles are improved, and the edges and corners of surface become softer. Friction properties indicate that when the talc content is 8 wt%, both µ and K are at a lower value, which show that have better wear resistance. The frictional surface is relatively smooth and no furrow trace has found. Mechanical properties show that with talc content increasing, tensile strength and flexural strength of composites increase.

Download Full-text

Relationship Between the Surface Chemical Composition of Implants and Contact With the Substrate

Journal of Oral Implantology ◽

10.1563/aaid-joi-d-11-00227 ◽

2015 ◽

Vol 41 (1) ◽

pp. 17-21 ◽

Cited By ~ 2

Author(s):

Mariana Lima da Costa Valente ◽

Antonio Carlos Shimano ◽

Elcio Marcantonio Junior ◽

Andréa Candido dos Reis

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Chemical Composition ◽

Surface Characterization ◽

Structural Changes ◽

Testing Machine ◽

Energy Dispersive ◽

Machined Surface ◽

X Ray ◽

Scanning Electron

The purpose of the study was to use scanning electron microscopy and energy dispersive x-ray spectrometry to assess possible morphologic and chemical changes after performing double-insertion and pullout tests of implants of different shapes and surface treatments. Four different types of implants were used—cylindrical machined-surface implants, cylindrical double-surface–treated porous implants, cylindrical surface-treated porous implants, and tapered surface-treated porous implants—representing a total of 32 screws. The implants were inserted into synthetic bone femurs, totaling 8 samples, before performing each insertion with standardized torque. After each pullout the implants were analyzed by scanning electron microscopy and energy dispersive x-ray spectrometry using a universal testing machine and magnified 35 times. No structural changes were detected on morphological surface characterization, only substrate accumulation. As for composition, there were concentration differences in the titanium, oxygen, and carbon elements. Implants with surface acid treatment undergo greater superficial changes in chemical composition than machined implants, that is, the greater the contact area of the implant with the substrate, the greater the oxide layer change. In addition, prior manipulation can alter the chemical composition of implants, typically to a greater degree in surface-treated implants.

Download Full-text

A Comparative Analysis of New Ti-Nb-Zr-Ta Orthopedic Alloys

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.837.259 ◽

2013 ◽

Vol 837 ◽

pp. 259-264 ◽

Cited By ~ 4

Author(s):

Andreea Carmen Bărbînţă ◽

Romeo Chelariu ◽

Marcelin Benchea ◽

Carmen Iulia Crimu ◽

Sorin Iacob Strugaru ◽

...

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Comparative Analysis ◽

Bone Resorption ◽

Modulus Of Elasticity ◽

Human Tissues ◽

X Ray Diffraction ◽

X Ray ◽

New Generation ◽

Scanning Electron

Ti-Nb-Zr-Ta alloys represent a new generation of biomaterials with possible applications in the orthopedic field, being developed in order to eliminate the negative aspects of the current orthopedic biomaterials, which consist mainly in a low biocompatibility with human tissues and high values of modulus of elasticity compared to the human bone. This paper presents a comparative study of new titanium alloys, corresponding to the Ti-Nb-Zr-Ta system: Ti-21Nb-6Zr-15Ta and Ti-25Nb-10Zr-8Ta, which were analyzed by scanning electron microscopy, X-ray diffraction and microindentation. The both alloys are classified as near-β alloys. The addition of alloying elements such as Ta, Nb and Zr represents a good solution for lowering modulus of elasticity, which is an important factor for reducing bone resorption and therefore for preventing implant failure.

Download Full-text

Study on the Properties of Poplar Micro/Nanofibril and its Composites

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.621.48 ◽

2012 ◽

Vol 621 ◽

pp. 48-53

Author(s):

Yan Ping Liu ◽

Jiang Tao Zhang ◽

Xiao Ya Luo ◽

Ying Ying Yao

Keyword(s):

Crystal Structure ◽

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Wheat Straw ◽

Internal Bond ◽

Urea Formaldehyde ◽

Formaldehyde Resin ◽

Chemical Compositions ◽

X Ray ◽

Scanning Electron

The micro/nanofibrils of poplar could be prepared by treatment of ultrasonic. The properties of micro/nanoﬁbrils were characterized by using scanning electron microscopy (SEM) and X-ray diffractometer (XRD). The results indicated that poplar micro/nanofibril was the same as raw fiber in chemical compositions and crystal structure. The crystallinity of micro/nanoﬁbrils was 84.99 percent, increased by 20 percent compared to original fiber after ultrasonic crushing. The micro/nanofibril diameter was from 50 nm to 1 μm.The internal bond strength (IB) of wheat-straw fiberboard could be significantly improved by adding poplar micro/nanofibril suspension to the urea formaldehyde resin adhesive(UF),when the adding amount of poplar micro/nanofibril suspension was 15wt percent, the IB of wheat-straw fiberboard was up to 0.86 MPa.

Download Full-text

Effect of B Refinement on Structure and Fracture Morphology of Al-7 wt.% Si Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.590.181 ◽

2014 ◽

Vol 590 ◽

pp. 181-186

Author(s):

Xiao Song Li ◽

An Hui Cai ◽

Ji Jie Zeng

Keyword(s):

Electron Microscopy ◽

Mechanical Properties ◽

Scanning Electron Microscopy ◽

Tensile Testing ◽

Testing Machine ◽

Fracture Morphology ◽

Optical Microscope ◽

Tensile Testing Machine ◽

Alloy Microstructure ◽

Scanning Electron

Using optical microscope, electronic tensile testing machine, scanning electron microscopy methods, such as detailed treatment of the B hypoeutectic Al-Si alloy microstructure, mechanical properties and fracture morphology were studied. The results showed that after treatment by the B refinement, α-Al dendrite phase was refined, resulting in mechanical properties of Al-Si alloy significantly improved. Which, B content 0.036wt.%, the alloy the best, the σb, δ, respectively, than the non-thinning increased 67.8% and 15.2%. From the fracture surface, the fracture morphology of the specimen showed a quasi-cleavage fracture. Which, B content 0.036wt.% at the time of fracture is more deep dimples, and a good plastic toughness.

Download Full-text

Thermophysical and Mechanical Properties of Carbonated Hydroxyapatite

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.512-515.989 ◽

2012 ◽

Vol 512-515 ◽

pp. 989-993 ◽

Cited By ~ 1

Author(s):

Qing Xia Zhu ◽

Wei Hui Jiang ◽

Chuan Shao ◽

Yi Bao

Keyword(s):

Electron Microscopy ◽

High Temperature ◽

Sintering Temperature ◽

Testing Machine ◽

Carbonate Content ◽

Flexure Strength ◽

Carbonated Hydroxyapatite ◽

Universal Testing ◽

Calcination Method ◽

Scanning Electron

The carbonated hydroxyapatite (CHA) was synthesized by precipitation-calcination method. The influences of carbonate subsitution on high-temperature sintering, thermal expansion coefficient (CET) and flexural strength were investigated by the high-temperature dilatometer, scanning electron microscopy (SEM) and universal testing machine. The results showed that the sintering temperatures of CHA were related to the initial carbonate contents. The sintering temperature decreased with increasing initial carbonate contents. The CET of CHAs decreased with the increase of carbonate content, due to the stoma caused by the partially decompostion of CHAs. The CHA ceramics tested were as strong in flexure strength when compared to non-carbonated hydroxyapatite.

Download Full-text

CBN Composites with a Nanosized Binding Phase

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.106.149 ◽

2005 ◽

Vol 106 ◽

pp. 149-152 ◽

Cited By ~ 1

Author(s):

Wioletta Gorczyńska-Zawiślan ◽

Ewa Benko ◽

Piotr Klimczyk

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Grain Size ◽

Surface Morphology ◽

Modulus Of Elasticity ◽

Indentation Load ◽

Thermodynamic Calculations ◽

Experimental Conditions ◽

Binding Phase ◽

Scanning Electron

In this work cBN-TiN composites were studied. The composites were prepared by the HPHT technique (p=8 GPa, T=1750 0C). A TiN binding phase was used in two forms: as micro and nanomaterials. Thermodynamic calculations showed that formation of new phases in the cBNTiN composites was not possible in the experimental conditions which was confirmed by XRD investigations carried out. The surface morphology of nanocomposites was studied by scanning electron microscopy. The structure of these composites was compact; a TiN phase was uniformly distributed between cBN grains. Hardness was measured by the Vickers method using an indentation load of 9.81 N. The hardness of the investigated samples was dependent on the volume and grain size of the binding phase. Young's modulus of elasticity was determined, but its value was found to be dependent on the grain size of the TiN phase.

Download Full-text

Comparison of two adhesive systems of various polyetheretherketone (PEEK) composites on the shear bond strength

International Dental Research ◽

10.5577/intdentres.2021.vol11.no2.1 ◽

2021 ◽

Vol 11 (2) ◽

pp. 54-61

Author(s):

Fatih Demirci ◽

Samet Tekin

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Bond Strength ◽

Surface Properties ◽

Shear Bond Strength ◽

Failure Modes ◽

Testing Machine ◽

Fiber Reinforced ◽

Adhesive Systems ◽

Scanning Electron

Aim: In this in vitro study, the effect of two adhesive systems applied to surfaces of different polyether-ether-ketone (PEEK) composites on the shear bond strength (SBS) of a composite resin was compared. Methodology: Eighty PEEK specimens were divided into four groups (n=20): Unfilled PEEK (UF), carbon-fiber-reinforced PEEK (CFR), glass-fiber-reinforced PEEK (GFR), and ceramic-reinforced PEEK (CR). Each group was further divided into two subgroups (n=10): Visio.link (VL) and Single Bond Universal (SB). The specimens with 8-mm diameter and 5-mm thickness were prepared. SBS was examined using a universal testing machine. Results were statistically analyzed by multivariate analysis of variance and Tukey’s post-hoc test. Failure modes were analyzed using a stereomicroscope at 20× magnification. Surface properties were examined by scanning electron microscopy. The surface properties of the specimens were examined by scanning electron microscopy (SEM). Results: Effect of different PEEK and adhesive systems on SBS was found to be statistically significant (p<0.05). SBS values for CFR-VL and UF-VL groups were statistically more significant than those for CFR-SB and UF-SB groups (p=0.001). SBS values for the GFR-VL group were statistically more significant than that for the UF-VL group (p=0.001). SBS values for the CF-SB group were statistically more significant than those for CFR-SB and CFR-SB groups (p=0.001). Failure modes were examined using a stereomicroscope at 20× magnification, and adhesive and mixed failure modes were observed. Conclusion: PEEK composites with different contents and properties can be used in fixed prosthetic restorations. However, additional experimental and clinical studies are required to investigate different PEEK frameworks and composite veneers. How to cite this article: Demirci F, Tekin S. Comparison of two adhesive systems of various polyetheretherketone (PEEK) composites on the shear bond strength. Int Dent Res 2021;11(2):54-61. https://doi.org/10.5577/intdentres.2021.vol11.no2.1 Linguistic Revision: The English in this manuscript has been checked by at least two professional editors, both native speakers of English.

Download Full-text

Effect of thermocycling aging on the flexural strength of feldspathic ceramic

Brazilian Dental Science ◽

10.14295/bds.2018.v21i3.1554 ◽

2018 ◽

Vol 21 (3) ◽

pp. 315

Author(s):

Ronaldo Lúís Almeida de Carvalho ◽

Estevão Tomomitsu Kimpara ◽

Eduardo Bresciani ◽

Márcia Carneiro Valera ◽

Renata Marques Melo

Keyword(s):

Electron Microscopy ◽

Flexural Strength ◽

Testing Machine ◽

Bending Test ◽

Catastrophic Failure ◽

Thermal Cycles ◽

Mean Values ◽

Three Point Bending ◽

Universal Testing ◽

Scanning Electron

Objective: The aim of the study was to evaluate the effect of aging through different thermocycling protocols on the flexural strength of a feldspathic ceramic. Material and Methods: Fifty ceramic bars, Vitablock Mark II (VITA), with dimensions of 18X4X2mm were prepared. The bars were randomly distributed to the groups (n = 10), which were defined according to the number of thermal cycles (TCy): G0 - no TCy; G500 - 500 cycles of TCy; G6000 - 6000 TCy; G10000 - 10000 TCy; G15000 - 15000 TCy. After aging, the specimens were subjected to the three point bending test in a universal testing machine (EMIC DL 1000), under 0.5mm/min speed and loading of 50kgf, until catastrophic failure. A sample of each group was evaluated for topographic morphology under Scanning Electron Microscopy. Results: For mechanical testing, the following mean values and standard deviation (MPa) were obtained: G0 (99.78 ± 5.07); G500 (101.64 ± 5.59); G6000 (98.13 ± 4.95); G10000 (91.77 ± 9.68); G15000 (101.51 ± 4.22). An analysis of variance by regression equation (p = 0.387) was performed, demonstrating a weak and non-significant correlation between flexural strength and number of thermal cycles. Conclusion: It can be concluded that aging in water solely by different numbers of temperature cycles did not influence on the flexural strength of a feldspathic ceramic. Keywords Material resistance; Aging; Ceramics.

Download Full-text