Hasil Pencarian  ::  Simpan CSV :: Kembali

"Springer Berlin Springer"

"Keberadaan limbah antibiotik pada perairan berbahaya bagi lingkungan dan makhluk hidup, salah satu antibiotik yang umum ditemui dan dalam kadar yang cukup besar adalah siprofloksasin (CIP). Selain itu, belakangan ini hidrogen (H2) sebagai bahan bakar bersih gencar diteliti untuk penerapannya dalam kehidupan sehari-hari, namun produksi H2 saat ini masih sangat bergantung dengan bahan bakar fosil. Untuk memenuhi kedua kebutuhan tersebut secara simultan digunakan teknologi fotokatalisis dan elektrokoagulasi yang dikombinasi. Fotokatalis yang digunakan pada penelitian ini adalah titanium nanotubes array (TiNTA) menggunakan dopan CuO dengan metode SILAR (Successive Ionic Layer Adsorption and Reaction). Pembentukan nanokomposit CuO-TiNTA dikonfirmasi dengan karakterisasi FESEM/EDX (Field Emission Scanning Electron Microscopy/Energy-Dispersive X-Ray), XRD (X-Ray Diffraction), dan UV-Vis DRS (Ultraviolet-Visible Diffuse Reflectance Spectroscopy). Pengujian fotokatalisis dilakukan dengan menggunakan lampu merkuri 250 W dua buah sebagai sumber foton fotokatalis, sementara pengujian elektrokoagulasi menggunakan anoda aluminium (Al) dan katoda stainless steel (SS-316) dengan tegangan 20 V, serta pada kombinasi menggunakan gabungan dari keduanya. Degradasi dan produksi H2 dari fotokatalis diperoleh sangat kecil dengan fotokatalis optimal TiNTA 5-CuO mencapai degradasi CIP sebesar 8,7% dan memproduksi 10,12 μmol/m2 H2. Eliminasi CIP dan produksi H2 secara elektrokoagulasi diperoleh sebesar 66,33% dan 1.137 mmol/m2, sementara pada kombinasi fotokatalisis-elektrokoagulasi terjadi peningkatan sebesar 36% dan 114% dari elektrokoagulasi, menghasilkan eliminasi CIP 85% dan 2.431 mmol/m2 H2 dan lebih besar daripada gabungan proses tunggal.

---

Presence of antibiotic in water is harmful towards environment, one of the commonly used antibiotics and usually present in large concentration is ciprofloxacin (CIP). Meanwhile, recently hydrogen (H2) has been extensively researched for application in daily lives, but commercial H2 production still depends on usage of fossil fuel. To fullfil both requirements simultaneously, photocatalysisis, electrocoagulation, and combination of both is used. Photocatalyst used in this study is titanium nanotubes array (TiNTA) doped with CuO using SILAR (Successive Ionic Layer Adsorption and Reaction) method. Presence of CuO-TiNTA nanocomposite is analysed by FESEM/EDX (Field Emission Scanning Electron Microscopy/Energy-Dispersive X-Ray), XRD (X-Ray Diffraction), and UV-Vis DRS (Ultraviolet-Visible Diffuse Reflectance Spectroscopy) characterisations. Photocatalysis experiment uses two 250 W mercury lamps as source of photon, meanwhile electrocoagulation experiment uses aluminium (Al) anode and stainless steel (SS-316) cathode with 20 V voltage, and combination uses both methods. Photocatalytic CIP degradation and H2 evolution give a small result with TiNTA 5-CuO as optimal photocatalyst with 8.7% CIP degradation and 10.12 μmol/m2 H2. CIP elimination and H2 production from electrocoagulation resulted in 66.33% CIP elimination and 1,137 mmol/m2 H2, while in photocatalysis-electrocoagultion significant increase of 36% elimination and 114% H2 production is observed compared to electrocoagulation, resulting 85% CIP elimination and 2,431 mmol/m2 H2 produced, higher result compared to sum of single processes."

"Tesis ini meneliti mengenai pengaruh asam stearat terhadap basal spasi organoclay dan sifat-sifat dari nanokomposit karet alam/organoclay terekspansi serta pengaruh organoclay terekspansi terhadap sifat dan morfologi dari nanokompositnya. Nanokomposit karet alam/organoclay terekspansi dibuat dengan cara pelelehan kompon. Hasil penelitian menunjukkan bahwa peningkatan dosis asam stearat dapat meningkatkan basal spasi organoclay sehingga organoclay terekspansi dapat terdispersi dengan merata di dalam matriks karet alam, menghasilkan nanokomposit dengan sifat mekanik dan swelling yang meningkat.

---

This thesis are to studies the effect of stearic acid on organoclay d-spacing and properties of natural rubber/expanded organoclay and the effect of expanded organoclays on properties and morphology of its nanocomposites. Natural rubber/expanded organoclay nanocomposites was prepared by using melt compounding technique. The result showed that the increasing of stearic acid doses could increase the d-spacing of organoclay so that expanded organoclay can disperse uniformly in natural rubber matrix, produces nanocomposites with increasing of mechanical and swelling properties."

"In recent years, much attention has been focused on biodegradable polymers from renewable resources. Due to its availability and low cost, starch is a promising candidate among biopolymers for use in biodegradable packaging materials and for other purposes. Starch-Based Polymeric Materials and Nanocomposites: Chemistry, Processing, and Applications presents the latest developments in starch chemistry, rheology, starch derivatives, starch-based nanocomposites, and their applications.Topics discussed include:The chemistry, microstructure, processing, and enzymatic degradation of starchThe importance and role of starch as a gelling agentPlasticization and the role of plasticizersVarious rheological techniques applied to starch-related products and the characteristics of starch dispersionsPolymeric aspects of reactive extrusion (REX) and its use on starch and other biopolymersCyclodextrins (CDs) and their industrial applications, and CD-based supramole and polymersThe potential of starch in food packaging, edible packaging, feedstock for bioproducts, and industrial and consumer productsThe theoretical basis and derivation of the mathematical model for multicomponent systems and its solution algorithmThe book also explores recent progress in biodegradable starch-based hybrids and nanomaterials and the incorporation of nanoparticles in starches to enhance their mechanical and thermal properties. The book concludes by discussing the use of biopolymeric nanoparticles (BNPs) in drug delivery and life cycle assessment (LCA) of starch-based polymeric materials for packaging and allied applications.With contributions from leading experts in academia and industry, this volume demonstrates the versatility of starch and its potential in a variety of applications."

"Carbon nanotube (CNT) Alumina + 13%TiO2 nanokomposit dengan fraksi volume CNT berbeda untuk mengetahui pengaruh distribusi CNT dalam matriks keramik. Perilaku self-lubrication pada pelapisan permukaan di cylinder liner yang diamati. Alumina 13% TiO2 + CNT nanokomposit dengan kandungan CNT Maksimum 4 % yang dilakukan dengan metode cold spraying pada pelapisan permukaan cylinder liner. Nanokomposit dibuat dengan komposisi berbeda dengan metode pencampuran planetary ball mill. Pengaruh ketahanan aus, friction dan self lubrication akan di analisa dengan Vickers microhardness, surface roughness, pengujian keausan ogoshi sebelum lubrikasi dan setelah lubrikasi, dan fourir transform infrared spectrometer.Hasil yang didapatkan ketahanan aus meningkat seiring penambahan CNT. Ketahanan aus dan mikrohardness berdasarkan penambahan CNT dihitung dalam penelitian ini. SEM - EDX digunakan untuk mengamati permukaan yang dilapisi CNT ? Alumina 13% TiO2 nanokomposit. Semua hasil menunjukkan metode cold spraying dan planetary ball mill secara signifikan meningkatkan distribusi CNT pada matriks alumina 13% TiO2 sehingga meningkatkan ketahanan aus dan memberikan efek self lubricant pada nanokomposit.

---

Carbon nanotubes (CNTs) Alumina + 13% TiO2 nanocomposite with a different volume fraction of CNT?s to determine the effect of CNT distribution in the ceramic matrix. The behavior of self-lubrication on the surface coating on the cylinder liner was observed. Alumina 13% TiO2 + CNT nanocomposite containing CNTs Maximum 4% which was conducted by cold spraying on the surface of the cylinder liner coating. Nanocomposite prepared with different compositions with a planetary ball mill mixing method. Effect of wear resistance, friction and self lubrication will be analyzed with a Vickers microhardness, surface roughness, ogoshi wear testing was used before and after lubrication lubrication, and fourir transform infrared spectrometer.

The results obtained wear resistance increases with the addition of CNTs. Wear resistance and mikrohardness by the addition of CNTs calculated in this study. SEM - EDX was used to observe the surface of the coated CNT - Alumina 13% TiO2 nanocomposite. All results show the method of spraying cold and planetary ball mill significantly improve the distribution of CNTs in the alumina matrix 13% TiO2 thereby increasing wear resistance and self-lubricant effect on the nanocomposite."

"Ceramic nanocomposites have been found to have improved hardness, strength, toughness and creep resistance compared to conventional ceramic matrix composites. Ceramic nanocomposites reviews the structure and properties of these nanocomposites as well as manufacturing and applications. Part one looks at the properties of different ceramic nanocomposites, including thermal shock resistance, flame retardancy, magnetic and optical properties as well as failure mechanisms. Part two deals with the different types of ceramic nanocomposites, including the use of ceramic particles in metal matrix composites, carbon nanotube-reinforced glass-ceramic matrix composites, high temperature superconducting ceramic nanocomposites and ceramic particle nanofluids. Part three details the processing of nanocomposites, including the mechanochemical synthesis of metallic–ceramic composite powders, sintering of ultrafine and nanosized ceramic and metallic particles and the surface treatment of carbon nanotubes using plasma technology. Part four explores the applications of ceramic nanocomposites in such areas as energy production and the biomedical field."

"Pada era ini, Aluminum AC4B telah banyak diaplikasikan untuk komponen kendaraan salah satunya adalah torak. Torak berperan sebagai penekan udara masuk dan penerima tekanan hasil pembakaran pada ruang bakar dan tersambung ke bagian poros engkol. Namun terdapat masalah-masalah seperti keausan dan penggunaan pelumas yang boros yang harus diatasi dengan ide melapisi cylinder liner dan cincin torak menggunakan nanokomposit dengan memvariasikan komposisi penguat CNT (0%, 2%, dan 4%) dengan metode pelapisan penyemprotan dingin. Prosedur perlakuan pendispersian dan planetary ball mill juga memegang peranan penting sebelum proses pelapisan dilakukan. Pengujian yang dilakukan adalah pengujian kekerasan mikro, metalografi-SEM, EDS (pemetaan unsur), kekasaran permukaan, ketahanan aus, dan FTIR. Dari hasil pengujian didapatkan data bahwa penambahan CNT hingga 2% akan meningkatkan kekerasan, ketahanan aus, dan juga dapat meningkatkan efisiensi penggunaan pelumas.

---

In this era, Aluminum AC4B has widely applied to vehicle components, one of the application is piston. Piston acts in order to pressing the air and receiving the results of the combustion pressure in the combustion chamber which is connected to the crankshaft. However, there are problems such as wear and wasteful use of lubricants that must be overcome by the idea of ​​coating the piston ring and also cylinder liner using nanocomposite by varying the composition of CNT reinforcement (0%, 2%, and 4) by using cold spraying for the coating method. Dispersing treatment procedures and planetary ball mill also plays an important role before the coating process is done. Tests were carried out which micro hardness testing, metallography-SEM, EDS (mapping element), surface roughness, wear resistance, and FTIR. Data obtained from the test results that the addition of up to 2% CNT will increase hardness, wear resistance, and also can improve the efficiency of the use of lubricants."

"Tesis ini merupakan bahasan hasil penelitian fabrikasi material nanokomposit dengan perbaikan pada proses fabrikasi. Penelitian ini bertujuan untuk meningkatkan sifat mekanik dan termal dari material nanokomposit nanoclaypolipropilena melalui peningkatan panjang screw dalam mesin twin screw extruder (TSE). Screw pendek yang digunakan memiliki panjang 300 mm, sedangkan screw panjang ukurannya 600 mm. Formulasi dari nanokomposit adalah 3,5 % nanoclay dalam matrik polipropilena dengan aditif kompatibiliser 5 % PP-g-MA. Hasil pengamatan struktur mikro nanokomposit menggunakan scanning electron microscope (SEM) dan scanning probe microscope (SPM) menunjukkan bahwa hasil fabrikasi nanokomposit menggunakan mesin pencampur TSE screw panjang memiliki sebaran/dispersi nanoclay yang lebih baik dibanding hasil fabrikasi menggunakan screw pendek. Dari hasil pengujian sifat mekanik nanokomposit yang dilakukan yang meliputi kekuatan tarik, modulus kekakuan, kekerasan, ketahanan aus dan ketangguhan menunjukkan bahwa nanokomposit hasil fabrikasi menggunakan screw panjang sifat mekaniknyalebih baik. Modulus kekakuan meningkat 34 %, ketangguhan dan kekerasan meningkat 1 %,. Dampak positif dari penelitian ini adalah meningkatnya sifat termal nanokomposit hasil fabrikasi menggunakan screw panjang dari pada hasil fabrikasi menggunakan screw pendek, sifat termal yang dianalisis meliputi: temperatur dekomposisi, temperatur defleksi, kecepatan bakar dan temperature leleh. Bila dibandingkan dengan polipropilena, maka nanokomposit memiliki peningkatan sifat sdiantaranya termal defleksi 7 %, termal dekomposisi 2 % dan ketahanan bakar 8 %.

---

This thesis is a discussion of material manufacturing nanocomposites with improvements in the manufacturing process. This research aims is to improve the mechanical and thermal properties of nanoclay-polypropylene nanocomposites material through the longer screw in the twin screw extruder (TSE) mixer machine. Short screw used own length of 300 mm, while the other screw length of 600 mm in size. Formulation of nanocomposites is 3.5% nanoclay in polypropylene matrix with compatibilizer of 5 % PP-g-MA. The results of micro structure of nanocomposites observed by scanning electron microscope (SEM) and scanning probe microscope (SPM) showed that the nanocomposites manufacturing using a long screw found that the dispersion of nanoclay in nanocomposites is better than fabricated using a short screw. The mechanical testing of nanocomposites materials includes a tensile strength, elastic modulus, hardness, impact, and wear resistance the results showed that the nanocomposites manufacturing use longer screw have increased of mechanical properties, elastic modulus improve 34 %, impact charpy and hardness improve 1 %,. The side effect of this research is thermal properties of nanocomposites manufacturing use long screw was increased compared nanocomposites manufacturing using short screw. The thermal properties has analysed by flammability, thermal decomposition, thermal deflection, and melting temperature. Compare to polypropylene, the nanokomposites as manufacture has improve thermal deflection 7 %, thermal decomposition 2 % and flame retardant 8 %."

"Pencemaran lingkungan adalah salah satu masalah serius disebabkan pembuangan limbah berbahaya dan beracun dari industri–industri yang tidak teregulasi. Salah satu material yang banyak digunakan sebagai zat warna adalah sunset yellow pada industri tekstil yang berdampak buruk, menyebabkan risiko kesehatan seperti depresi, kerusakan ginjal, kerusakan hati, dan kanker. Pada penelitian ini telah dilakukan sintesis nanokomposit Nanochitosan/Fe₃O₄−SrSnO₃ untuk mendegradasi zat warna sunset yellow. Nankomposit Nanochitosan/Fe₃O₄−SrSnO₃ dikarakterisasi dengan Fourier–transform infrared spectroscopy (FTIR), ultraviolet–visible (UV–Vis), X–ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high–resolution transmission electron microscopy (HRTEM), Brunauer–Emmet–Teller (BET) dan ultraviolet visible–diffuse reflectance (UV–DRS). Pengaruh Fe₃O₄ terhadap sisi aktif SrSnO₃ telah dipelajari dan energi celah pita dari SrSnO₃ menjadi 2,4 eV dengan komposisi Fe₃O₄/SrSnO₃ (3:1) dengan persen degradasi sebesar 88,45% . Nanochitosan ditambahkan sebagai support meningkatkan aktivitas dari nanokomposit Fe₃O₄−SrSnO₃ dengan persen dgradasi 97,42%. Nanokomposit yang optimal yang digunakan untuk analisis kinetika reaksi dan isoterm adsorpsi adalah dengan kondisi massa 0,04 gram, pH 10, dan waktu selama 75 menit. Kinetika reaksi mengikuti psuedo first order dengan konstanta laju reaksi 0,058 dan sesuai dengan isoterm adsorpsi Langmuir

---

Environmental pollution is one of the most serious problems caused by the disposal of hazardous and toxic waste from unregulated industries. One material that is widely used as a dye is sunset yellow in the textile industry which has adverse effects, causing health risks such as depression, kidney damage, liver damage, and cancer. In this study, Nanochitosan/ Fe₃O₄−SrSnO₃ nanocomposite has been synthesized to degrade sunset yellow dye. Nanochitosan/ Fe₃O₄−SrSnO₃ nanocomposites were characterized by Fourier-transform infrared spectroscopy (FTIR), ultraviolet-visible (UV-Vis), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), Brunauer-Emmet-Teller (BET) and ultraviolet visible-diffuse reflectance (UV-DRS). The effect of Fe3O4 on the active side of SrSnO₃ was studied and the band gap energy of SrSnO₃ became 2.4 eV with Fe₃O₄/SrSnO₃ composition (3:1) with a percent degradation of 88.45%. Nanochitosan added as support increases the activity of Fe₃O₄−SrSnO₃ nanocomposite with 97.42% degradation percent. The optimal nanocomposite used for the analysis of reaction kinetics and adsorption isotherms was with a mass condition of 0.04 grams, pH 10, and time for 75 minutes. The reaction kinetics followed first order psuedo with a reaction rate constant of 0.058 and fit the Langmuir adsorption isotherm."