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Modification of Silica as a Sealing Rubber Filler with Coupling Agents Hexamethyldisilazane (HDMS) and Methyltriethoxysilane (MTES) Shely Octavania; Eneng Maryani; Hernawan Hernawan; Lintong Sopandi Hutahaean; Untung Prayudie
Jurnal Keramik dan Gelas Indonesia Vol 30, No 2 (2021): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v30i2.7407

Materials that can be used in the manufacture of LPG cylinder sealant rubber is silica. However, easily agglomerates so it is not compatible with rubber. Therefore, the silica surface must be modified to reduce agglomeration and improve compatibility with rubber. This study aims to determine the effect of silica modification on the characteristics of LPG cylinder sealing rubber produced. Silica modification is carried out using 2 (two) types of coupling agents, namely HMDS and MTES with and without Si-69. Preparation of rubber compound with SIR 20 raw material is carried out using an open mill tool with a modified silica filler dose of 40 phr. The characteristics of rubber tested were compound maturity test using a Rheometer and tensile strength and elongation at break using a Universal Testing Machine. The test results show that silica modification can accelerate the maturation time of the compound and increase the tensile strength and elongation at break. The maturation time of the rubber compound with silica filler modified by MTES and HMDS was 7 minutes 36 seconds and 7 minutes 53 seconds. The resulting tensile strength and elongation values are 18.8 MPa and 720% (MTES) and 19.0 MPa and 770% (HMDS). The use of MTES and Si-69 as coupling agent for silica produced rubber with tensile strength and elongation at break of 15.9 MPa and 660%.

The Effect of Alkali Addition and Coating Time on Hydrophilic Properties of Antimocrobial Ceramic Tiles Irna Rosmayanti; Rizky Berliana Wijayanti; Eneng Maryani
Jurnal Keramik dan Gelas Indonesia Vol 28, No 2 (2019): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v28i2.5759

Antimicrobial glaze is used for sanitation needs in special environments such as hospitals or schools. Antimicrobial properties of TiO2 involve photocatalytic activity on inorganic material. A hydrophilic surface, with contact angle value <65o, is resulted by those activity. In this study, polished tile coating was done using TiO2 material which had been prepared through a dissolving process in sulfuric acid followed by gel formation with addition of 2 types of alkali, ammonia and ammonium bicarbonate. The TiO2 gel formed was dispersed in aquadest and then coated on the surface of the tile by dip coating with various deposition time (3 hours, 6 hours and 53 hours). ANOVA test results represent that both main effect of alkali type and coating time, and interaction effect of these variable produce significant effects on contact angles. Addition of ammonium bicarbonate produce better hydrophilic surface on the tile than addition of ammonia. The longer coating time will increase hydrophilic characteristic of the surface.

Modifikasi Filter Keramik dengan γ-alumina sebagai adsorbent logam berat Eneng Maryani; Suhanda Suhanda; Naili Sofyaningsih; Ayu Ratnaningsih
Jurnal Keramik dan Gelas Indonesia Vol 25, No 2 (2016): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Filter keramik adalah filter yang terbuat dari bahan baku keramik. Filter tersebut dapat didesain sedemikian rupa sehingga dapat digunakan untuk menyaring partikel suspensi, koloid, logam berat, ion-ion tertentu, serta mikroorganisme seperti bakteri, kuman, parasit, dan jamur. Pada penelitian ini filter keramik dibuat dari bahan keramik yaitu ball clay, alumina dan karbon yang dibentuk dengan cara slip casting. Untuk meningkatkan daya adsorpsi filter keramik terhadap logam berat maka dilakukan modifikasi filter dengan mengisi adsorben γ–alumina ke dalamnya.Filter tersebut memiliki mikrostruktur mesoporous dengan karakteristik tekstural: dpori rata-rata= 40,410 nm, Vpori total = 0,1146 cc/g dan luas permukaan = 11,348 m2/g untuk filter A serta dpori rata-rata= 29,458 nm, Vpori total = 0,0536 cc/g dan luas permukaan = 7,280 m2/g untuk filter B.Filter keramik dapat menyaring air berlumpur sehingga diperoleh air yang jernih. Filter keramik Aa1 dan Aa2 (diisi adsorben γ–alumina) serta filter B (tanpa diisi adsorben γ–alumina) telah berhasil mengadsorpsi logam berat terutama Pb sehingga diperoleh kadar Pb sampai batas kuantifikasi alat pengukuran. Adsorpsi logam arsen paling baik dilakukan menggunakan filter Aa1 dengan % removal 97,39. Adsorpsi logam kadmium (Cd) paling baik dilakukan menggunakan filter B dengan % removal 99,80. Filter keramik B dapat berfungsi ganda yaitu sebagai filter (penyaring) dan adsorben logam berat.

The Preparation Hydroxyapatite – Zirconia Composites as Bioceramic Materials Eneng Maryani; Sri Cicih Kurniasih; Naili Sofiyaningsih; Bayu Priyanto
Jurnal Keramik dan Gelas Indonesia Vol 27, No 1 (2018): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Hydroxyapatite (HAP) is a material often used as a bioceramic because of its special characteristics such as has the same mineral composition as the original bone and teeth, does not cause cytotoxic effects, biocompatible, bioactive and promote osteoconductivity. However HAP shows poor mechanical properties so it is less applicable to biological applications that must accept heavy loads. Therefore, it is necessary to modify the hydroxyapatite structure through the process of reinforcement (composite formation) with other materials such as zirconia (ZrO2). In this research, hydroxyapatite – zirconia composite prepared from each component made from local natural mineral. The compositions of prepared hydroxyapatite – zirconia composites are 75:25, 50:50, and 25:75. In all composite compositions prepared after calcination at 1000 oC, hydroxyapatite phase change into whitlockite and tetrahedral zirconia phase formed. Composite of HAP-ZrO2 =75:25 is the most suitable proportion because they still the highest hydroxyapatite content and all zirconia is in the tetrahedral phase

Modification of Silica as a Sealing Rubber Filler with Coupling Agents Hexamethyldisilazane (HDMS) and Methyltriethoxysilane (MTES) Shely Octavania; Eneng Maryani; Hernawan Hernawan; Lintong Sopandi Hutahaean; Untung Prayudie
Jurnal Keramik dan Gelas Indonesia Vol 30, No 2 (2021): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v30i2.7407

Materials that can be used in the manufacture of LPG cylinder sealant rubber is silica. However, easily agglomerates so it is not compatible with rubber. Therefore, the silica surface must be modified to reduce agglomeration and improve compatibility with rubber. This study aims to determine the effect of silica modification on the characteristics of LPG cylinder sealing rubber produced. Silica modification is carried out using 2 (two) types of coupling agents, namely HMDS and MTES with and without Si-69. Preparation of rubber compound with SIR 20 raw material is carried out using an open mill tool with a modified silica filler dose of 40 phr. The characteristics of rubber tested were compound maturity test using a Rheometer and tensile strength and elongation at break using a Universal Testing Machine. The test results show that silica modification can accelerate the maturation time of the compound and increase the tensile strength and elongation at break. The maturation time of the rubber compound with silica filler modified by MTES and HMDS was 7 minutes 36 seconds and 7 minutes 53 seconds. The resulting tensile strength and elongation values are 18.8 MPa and 720% (MTES) and 19.0 MPa and 770% (HMDS). The use of MTES and Si-69 as coupling agent for silica produced rubber with tensile strength and elongation at break of 15.9 MPa and 660%.

The Effect of Alkali Addition and Coating Time on Hydrophilic Properties of Antimocrobial Ceramic Tiles Irna Rosmayanti; Rizky Berliana Wijayanti; Eneng Maryani
Jurnal Keramik dan Gelas Indonesia Vol 28, No 2 (2019): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v28i2.5759

Antimicrobial glaze is used for sanitation needs in special environments such as hospitals or schools. Antimicrobial properties of TiO2 involve photocatalytic activity on inorganic material. A hydrophilic surface, with contact angle value <65o, is resulted by those activity. In this study, polished tile coating was done using TiO2 material which had been prepared through a dissolving process in sulfuric acid followed by gel formation with addition of 2 types of alkali, ammonia and ammonium bicarbonate. The TiO2 gel formed was dispersed in aquadest and then coated on the surface of the tile by dip coating with various deposition time (3 hours, 6 hours and 53 hours). ANOVA test results represent that both main effect of alkali type and coating time, and interaction effect of these variable produce significant effects on contact angles. Addition of ammonium bicarbonate produce better hydrophilic surface on the tile than addition of ammonia. The longer coating time will increase hydrophilic characteristic of the surface.

Modifikasi Filter Keramik dengan γ-alumina sebagai adsorbent logam berat Eneng Maryani; Suhanda Suhanda; Naili Sofyaningsih; Ayu Ratnaningsih
Jurnal Keramik dan Gelas Indonesia Vol 25, No 2 (2016): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v25i2.2665

Filter keramik adalah filter yang terbuat dari bahan baku keramik. Filter tersebut dapat didesain sedemikian rupa sehingga dapat digunakan untuk menyaring partikel suspensi, koloid, logam berat, ion-ion tertentu, serta mikroorganisme seperti bakteri, kuman, parasit, dan jamur. Pada penelitian ini filter keramik dibuat dari bahan keramik yaitu ball clay, alumina dan karbon yang dibentuk dengan cara slip casting. Untuk meningkatkan daya adsorpsi filter keramik terhadap logam berat maka dilakukan modifikasi filter dengan mengisi adsorben γ–alumina ke dalamnya.Filter tersebut memiliki mikrostruktur mesoporous dengan karakteristik tekstural: dpori rata-rata= 40,410 nm, Vpori total = 0,1146 cc/g dan luas permukaan = 11,348 m2/g untuk filter A serta dpori rata-rata= 29,458 nm, Vpori total = 0,0536 cc/g dan luas permukaan = 7,280 m2/g untuk filter B.Filter keramik dapat menyaring air berlumpur sehingga diperoleh air yang jernih. Filter keramik Aa1 dan Aa2 (diisi adsorben γ–alumina) serta filter B (tanpa diisi adsorben γ–alumina) telah berhasil mengadsorpsi logam berat terutama Pb sehingga diperoleh kadar Pb sampai batas kuantifikasi alat pengukuran. Adsorpsi logam arsen paling baik dilakukan menggunakan filter Aa1 dengan % removal 97,39. Adsorpsi logam kadmium (Cd) paling baik dilakukan menggunakan filter B dengan % removal 99,80. Filter keramik B dapat berfungsi ganda yaitu sebagai filter (penyaring) dan adsorben logam berat.

The Preparation Hydroxyapatite – Zirconia Composites as Bioceramic Materials Eneng Maryani; Sri Cicih Kurniasih; Naili Sofiyaningsih; Bayu Priyanto
Jurnal Keramik dan Gelas Indonesia Vol 27, No 1 (2018): Jurnal Keramik dan Gelas Indonesia
Publisher : Balai Besar Keramik

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32537/jkgi.v27i1.4038

Hydroxyapatite (HAP) is a material often used as a bioceramic because of its special characteristics such as has the same mineral composition as the original bone and teeth, does not cause cytotoxic effects, biocompatible, bioactive and promote osteoconductivity. However HAP shows poor mechanical properties so it is less applicable to biological applications that must accept heavy loads. Therefore, it is necessary to modify the hydroxyapatite structure through the process of reinforcement (composite formation) with other materials such as zirconia (ZrO2). In this research, hydroxyapatite – zirconia composite prepared from each component made from local natural mineral. The compositions of prepared hydroxyapatite – zirconia composites are 75:25, 50:50, and 25:75. In all composite compositions prepared after calcination at 1000 oC, hydroxyapatite phase change into whitlockite and tetrahedral zirconia phase formed. Composite of HAP-ZrO2 =75:25 is the most suitable proportion because they still the highest hydroxyapatite content and all zirconia is in the tetrahedral phase

Sintesis dan Karakterisasi Nanopartikel Zirkonia Terstabilkan Kalsium (CSZ) Berbasis Prekursor Zirkonium Hidroksida dari Pasir Zirkon Menggunakan Templat Etilen Glikol Hasna Rofifah Novianti; Eneng Maryani; Diana Rakhmawaty Eddy; Solihudin Solihudin; Ferry Arifiadi; Dewi Idamayanti
Chimica et Natura Acta Vol 10, No 2 (2022)
Publisher : Departemen Kimia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/cna.v10.n2.40335

Zirkonia yang distabilkan (stabilized zirconia) sangat menjanjikan karena memiliki sifat fisik, mekanik, termal, serta biokompatibilitas yang baik. Penelitian terkini memperlihatkan zirkonia yang distabilkan dapat digunakan pada bidang lingkungan, elektrolit, dan katalis. Zirkonia memiliki tiga fase yang stabil pada rentang suhu berbeda yaitu fase monoklinik, tetragonal dan kubik. Transformasi yang terjadi dari fase tetragonal ke monoklinik menyebabkan terjadinya retak mikro. Zirkonia perlu ditambahkan doping untuk dapat stabil selama pendinginan setelah tahap kalsinasi. Telah dilakukan sintesis zirkonia yang distabilkan dengan penambahan doping CaCl2 sebesar 1, 5 dan 10% b/b serta variasi suhu 600, 800 dan 1000°C untuk melihat pengaruhnya terhadap pembentukan fase ZrO2. Metode yang digunakan pada penelitian ini adalah metode sol-gel sehingga diperoleh calcia stabilized zirconia (CSZ) berukuran nano menggunakan bantuan etilen glikol sebagai templat. Hasil FTIR menunjukkan ikatan Ca-O muncul pada area sidik jari 455,9 cm-1. Ikatan Ca-O ini tumpang tindih dengan ikatan Zr-O pada daerah sidik jari 509,6 cm-1 (m-ZrO2) dan 754,16 cm-1 (t-ZrO2). Pengaruh doping dan suhu kalsinasi terhadap fase pembentukan nanopartikel CSZ dipelajari menggunakan difraksi sinar-X menunjukkan fase tetragonal teridentifikasi pada suhu kalsinasi 800°C dan fase monoklinik teridentifikasi pada suhu kalsinasi 1000°C. Konsentrasi CaCl2 mempengaruhi transformasi fase ZrO2, semakin tinggi konsentrasi CaCl2 yang ditambahkan ke dalam ZrO2 maka semakin stabil fase tetragonal ZrO2 pada sampel CSZ. Hasil morfologi dipelajari menggunakan TEM dan SEM menunjukkan nanopartikel dengan ukuran rata-rata 11-25 nm berbentuk aglomerasi dengan sebagian besar memiliki partikel berbentuk sferik dan sebagian kecil berbentuk nanorod dan nanotube.

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