A comparative study of small-size ceria–zirconia microspheres fabricated by external and internal gelation

Wang, Guogao; Ma, Jing; Gao, Yong; Zhao, Xinqing; Hao, Shaochang; Deng, Changsheng; Liu, Bing

doi:10.1007/s10971-016-3981-8

Cited by 26 publications

(21 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The calcination procedure was set according to the TGA-DTA characterization in our previous study. 12 Before 600°C, the temperature rose at a rate of 1°C/min and kept for 4 h at 200°C, 400°C, and 600°C, respectively. At this programmed heating stage, organics in microspheres were burnt out or decomposed in air.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Precisely Controlling Preparation of Ceria‐Stabilized Zirconia Microspheres of ~100 μm by External Gelation

Wang

Gao

et al. 2016

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

Ceria‐stabilized zirconia (CSZ) microspheres of ~100 μm were prepared by external gelation process. The inner diameter of nozzle was 0.2 mm. The key process parameters including broth pH value, Zr concentration, flow rate, and vibration frequency were optimized for precise control of the diameter. The optimum parameters were found to be flow rate of 11.08 mL/min, Zr concentration of 0.72 mol/L, and vibration frequency of 2650 Hz. CSZ microspheres with an average diameter of 103.1 μm and standard deviation of 4.4 were prepared under these conditions. CSZ microspheres showed good monodispersity, good sphericity, and high density.

show abstract

Section: Methodsmentioning

confidence: 99%

“…They were placed in a muffle furnace for calcining and sintering. The calcination procedure was set according to the TGA‐DTA characterization in our previous study . Before 600°C, the temperature rose at a rate of 1°C/min and kept for 4 h at 200°C, 400°C, and 600°C, respectively.…”

Section: Methodsmentioning

confidence: 99%

Precisely Controlling Preparation of Ceria‐Stabilized Zirconia Microspheres of ~100 μm by External Gelation

Wang

Gao

et al. 2016

Int J Applied Ceramic Tech

View full text Add to dashboard Cite

show abstract

“…Pada proses gelasi eksternal menggunakan material Ce-Zr, digunakan bahan baku produk dari HST Cina yaituCe(NO3)3.6H2O dan ZrO(NO3)2.2H2O. Kedua bahan baku dilarutkan menjadi larutan yang homogen [8]. Larutan Ce-Zr nitrat kemudian ditambahkan dengan ureabuatan E-Merck yang membentuk senyawa kompleks.…”

Section: Teoriunclassified

“…Pada pengeringan dan kalsinasi, terjadi penurunan berat dan ukuran (diameter) gel yang cukup besar, karena sebagian besar alkohol (IPA), air bebas, air terikat menguap, dan terjadi dekomposisi bahan-bahan organik maupun anorganik dalam gel membentuk oksida logam Ce dan Zr. Frekuensi vibrasi (cm -1 ) Grup Referensi pengamatan 3500 [5] 1600 [7] 1390 [7] 1180 [6] 640 [8] 3132 [4]. Setelah suhu 400 o C hingga 500 o C massa relatif stabil.…”

Section: Perlakuan Panasunclassified

See 1 more Smart Citation

PENGARUH PERBANDINGAN MOL Ce/Total DALAM LARUTAN UMPAN TERHADAP KERNEL CSZ HASIL SINTER.

Susilowati¹,

Sukarsono²,

Yusnitha³

2019

gnd

View full text Add to dashboard Cite

AbstrakPENGARUH PERBANDINGAN MOL Ce/TotalDALAM LARUTAN UMPAN TERHADAP KERNEL CSZ HASIL SINTER. Telah dilakukan pembuatan kernel ceria stabilized zirconia (CSZ) metode gelasi eksternal. Sebagai bahan dasar umpan gelasi menggunakan Ce(NO3)3.6H2O dan ZrO(NO3)2.2H2O dengan variasi perbandingan mol (Zr/Total) nitrat 12, 24, 36, 48 dan 60% dalam larutan umpan. Untuk memperoleh gel yang baik, parameter kunci yang harus dipenuhi pH sol, viskositas umpan, frekuensi, amplitude dan flow rate umpan. Pada proses pencucian, konduktivitas air cucian terakhir dikondisikan pada ≤ 20µS/cm setara 0,001 % berat kandungan NH4OH. Proses pengeringan dilakukan pada kondisi vakum pada 80°C, kalsinasi suhu 500°C , laju pemanasan < 2°C suasana atmosfer. Gel CSZ hasil pengeringan diukur diameternya dan kondisi fisiknya menggunakan mikroskop digital. Karakterisasi menggunakan DTA-TGA menunjukkan adanya puncak endotermis pada suhu sekitar 80°C hingga suhu 189°C, di mana terjadi pengurangan massa sebesar 18,75%, dan puncak eksotermis, terjadi pengurangan massa 11,34%. Puncak endotermis terlihat ada penguapan air dan sisa ammonia dalam gel, puncak eksotermis karena terjadi dekomposisi bahan-bahan organik, ammonium nitrat dalam gel. Dari variasi perbandingan mol Ce/Total gel yang terbaik hingga proses kalsinasi dan sintering hingga suhu 1350°C adalah 12 dan 24 %, gel masih terlihat utuh tidak pecah maupun retak, gel hasil kalsinasi memiliki spektrum IR dengan frekuensi vibrasi pada nilai yang dimiliki gugus fungsi hidroksil, nitrat, cerium dan zirkonium oksida. Kernel CSZ tersinter menghasilkan difraktogram senyawa Zirconium Cerium Oxide dengan struktur kristal tetragonal.

show abstract

Fabrication of CeO₂ microspheres by internal gelation process using flow‐focusing droplet generator

et al. 2023

View full text Add to dashboard Cite

Sphere‐pac fuel is an alternative nuclear fuel technology in which microspheres of two or more sizes are utilized to fill the cladding tube in place of the more conventional single‐size fuel pellets. This provides leeway for adjusting the fuel pellet packing density and resulting cladding tube porosity. The current investigation makes use of a flow‐focusing droplet generator made from stainless steel (S.S.) 316 L, with a channel internal diameter (I.D.) of 0.5, 0.8, 1, and 3 mm. These microspheres were supposed to be of actinide oxide but here, cerium has been chosen as a surrogate of plutonium. Detailed information about the flow‐focusing droplet generator, internal gelation process, and sphere‐pac fuel has been provided. The size and size distribution of ceria microspheres were investigated by varying the flow rates of the continuous and dispersed phase. The characterization of ceria microspheres has been conducted using techniques such as scanning electron microscope (SEM), X‐ray diffraction (XRD), Fourier‐transform infrared spectroscopy (FTIR), and Brunauer–Emmett–Teller (BET) analyses. The size of prepared monodisperse microspheres was controlled precisely (within ±2%) in the range of 498–2888 μm using four S.S. 316 L flow‐focusing droplet generators with channel I.D. 0.5, 0.8, 1, and 3 mm, respectively, and the coefficient of variation of the size distribution was found to be less than 2%.

show abstract

A comparative study of small-size ceria–zirconia microspheres fabricated by external and internal gelation

Cited by 26 publications

References 29 publications

Precisely Controlling Preparation of Ceria‐Stabilized Zirconia Microspheres of ~100 μm by External Gelation

Precisely Controlling Preparation of Ceria‐Stabilized Zirconia Microspheres of ~100 μm by External Gelation

PENGARUH PERBANDINGAN MOL Ce/Total DALAM LARUTAN UMPAN TERHADAP KERNEL CSZ HASIL SINTER.

Fabrication of CeO₂ microspheres by internal gelation process using flow‐focusing droplet generator

Contact Info

Product

Resources

About

A comparative study of small-size ceria–zirconia microspheres fabricated by external and internal gelation

Cited by 26 publications

References 29 publications

Precisely Controlling Preparation of Ceria‐Stabilized Zirconia Microspheres of ~100 μm by External Gelation

Precisely Controlling Preparation of Ceria‐Stabilized Zirconia Microspheres of ~100 μm by External Gelation

PENGARUH PERBANDINGAN MOL Ce/Total DALAM LARUTAN UMPAN TERHADAP KERNEL CSZ HASIL SINTER.

Fabrication of CeO2 microspheres by internal gelation process using flow‐focusing droplet generator

Contact Info

Product

Resources

About

Fabrication of CeO₂ microspheres by internal gelation process using flow‐focusing droplet generator