This issue consists of 5 articles from 21 authors affiliated with 8 institutions from 5 countries including:

• Indonesia (Universitas Pendidikan Indonesia, Universitas Sultan Ageng Tirtayasa)
• Brunei Darussalam (University Brunei Darussalam)
• Malaysia (Universiti Teknologi PETRONAS (UTP), Universiti Teknologi Malaysia)
• Algeria (University of Ouargla, University El Oued)
• Mexico (Sonora Technological Institute)

Articles

Techno-Economic Evaluation of Gold Nanoparticles Using Banana Peel (Musa Paradisiaca)

Permata Maratussolihah, Salma Rahmadianti, Kanthi Pawening Tyas, Gabriela Chelvina Santiuly Girsang, Asep Bayu Dani Nandiyanto, Muhammad Roil Bilad

Electrical Textile: Graphite Paste on Gloves for Touching Screen of Smartphones and Tablets

Qintar Alifah Ristiana

The Effect of Zeolite Imidazole Framework Geometrical Structure on Carbon Dioxide Permeability for Mixed Matrix Membrane

Nurhani Nadiah Mohd Najdi, Siti Nur Alwani Shafie, Nik Abdul Hadi Md Nordin, Norhaniza Yusoff, Mohd Hafiz Dzharfan Othman

Palm Fibers Effect on the Performance of a Conventional Solar Still

Imad Kermerchou, Idris Mahdjoubi, Chamseddine Kined, Abderrahmane Khechekhouche, Abdelkader Bellila, German Eduardo Devora Isiordia

Characterization of Zeolites from Tasikmalaya, Indonesia, and Its Application for Ammonium Removal

Teguh Kurniawan, Nuryoto Levina Mandalagiri, Indar Kustiningsih