CONVERTING HARMFUL GASES RELEASED FROM FACTORIES INTO USEFUL SUBSTANCES

Muhammad Hazman Bin Muhammad Iskandar 국제과학영재학회 2010 APEC Youth Scientist Journal Vol.2 No.-

This research focuses on converting harmful gases which are emitted by factories into other types of substances either liquids or gases, depending on how useful it can become. These harmful gases will be treated in a gas condenser factory where they will undergo several processes such as condensation and fractional distillation. A simple experiment can be carried out to show the possibility of this research, using simple materials and methods such as a condenser and a special place to carry out fractional distillation, saving much cost and time. The purpose of the research is to reduce the emission of harmful gases into the atmosphere which can harm the living things and create breathing problems and difficulties. Hence, decreasing the rate of air pollution. From this research as well, the world can be changed by making it a better, more convenience and more comfortable place to live on.

A short review on electrochemical exfoliation of graphene and graphene quantum dots

Wan Hazman Danial,Noriliya Aina Norhisham,Ahmad Fakhrurrazi Ahmad Noorden,Zaiton Abdul Majid,Kazunari Matsumura,Anwar Iqbal 한국탄소학회 2021 Carbon Letters Vol.31 No.3

The synthesis of graphene and graphene quantum dots (GQDs) employing various approaches with a range of precursors, chemicals, and parameters has been reported. Most of the top-down and bottom-up techniques employ strong and hazardous chemical environments, complicated and tedious procedures, are time-consuming, and often require special equipment. Another drawback of the techniques reported is the production of agglomerated, inhomogeneous, and non-dispersible graphene in aqueous solvents or organic solvents, thus limiting its application. This work specifically and comprehensively describes the electrochemical exfoliation of graphene and GQDs, which is often considered as a simple one-step, facile, non-hazardous, and highly efficient technique yet favourable for mass production. A brief discussion on the advantageous and challenges of the electrochemical technique and applications of the electrochemically exfoliated graphene and GQDs is also presented.

Recent advances on the preparation and application of graphene quantum dots for mercury detection: a systematic review

Danial Wan Hazman,Mohamed Nurul Ain Syazalin,Majid Zaiton Abdul 한국탄소학회 2022 Carbon Letters Vol.32 No.1

The mercury ion (Hg2+) is regarded as one of the toxic cations that is extremely harmful and dangerous to human health and the environment. With this growing awareness, it is imperative that facile and rapid sensing systems developed for the detection of Hg2+. Due to excellent sensitivity and selectivity, graphene quantum dots (GQDs), a zero-dimensional carbon nanomaterial, are attracting the attention of researchers as promising candidates as fluorescent probes for Hg2+ detection. This study aimed at conducting an in-depth review of recent advances into GQD-based materials as fluorescent probes in Hg2+ sensing. This systematic review was carried out by covering three main databases, namely, Scopus and Science Direct as the dominant databases, followed by Google Scholar as the supporting database. GQD-based materials encompassing bare GQDs, N-GQDs, B, N-GQDs, N, S-GQDs, N, K-GQDs, RhB-GQDs, Cys-GQDs, PEHA-GQD-DPA, Gly-GQDs, Mn(II)-N-GQDs, NH2–Ru@ SiO2-NGQDs and FA-GQDs were discussed thoroughly with regard to their synthesis strategies, along with their potential application in the detection of Hg2+. The doping of heteroatoms is envisaged to enhance the quantum yield and selectivity of bare GQDs. This review might unlock a wide range of opportunities for the application of various GQD-based materials as an adaptable, feasible and scalable approach to the detection of Hg2+.

Recent advances on the enhanced thermal conductivity of graphene nanoplatelets composites: a short review

Danial Wan Hazman,Abdul Majid Zaiton 한국탄소학회 2022 Carbon Letters Vol.32 No.6

Graphene nanoplatelets (GNPs) have garnered significant attention in the field of thermal management materials due to their unique morphology and remarkable thermal conductive properties. Their impressive thermal properties make them an interesting choice of nanofillers with which to produce multifunctional composite materials and a host of other applications whilst their structural and thermal properties significantly improve their target materials or composites. Therefore, this present study reviewed recent advances in the use of GNPs as nanofillers to enhance the thermal conductivity of various materials or composites. The improved thermal conductivity that GNPs impart in composites is also comprehensively compared and discussed. Therefore, this review may reveal hitherto unknown opportunities and pave the way for the production of materials with enhanced thermal applications including electronics, aerospace devices, batteries, and structural reinforcement.

The effect of calcium carbonate particle size on the formations β-tricalcium phospate

Shah Rizal Kasim,Yeong Meng How,Hazman Seli,Hazizan Md Akil,Zainal Arifin Ahmad 한양대학교 세라믹연구소 2009 Journal of Ceramic Processing Research Vol.10 No.5

β-tricalcium phosphate (β-TCP) powder was synthesized using various calcium carbonate (CaCO3) particles sizes (40 nm- 780 μm) with phosphoric acid (H3PO4) at room temperature (25℃). CaCO3 was first dissolved in deionized water at room temperature followed by the addition of H3PO4. The mixture was stirred until reaching a stable pH between 5.5-6.5 for 1 hour. The time taken to reach pH 5.5 increased from 12.5 minutes to 1140 minutes as the CaCO3 particle size increased from 40 nm to 780 μm. The slurry was filtered, dried in oven at a temperature of 80℃ for 24 hours then crushed with an agate mortar and calcined at a temperature of 850℃ to form the β-TCP phase. XRD quantitative analysis showed that the amount of the â-TCP synthesized from CaCO3 as the starting material decreased from 81.9% to 20.3% as the CaCO3 particle size increased from 40 nm to 780 μm. FESEM analysis showed that the morphology of CaCO3 as the starting material was not maintained after it was synthesized to β-TCP powder. β-tricalcium phosphate (β-TCP) powder was synthesized using various calcium carbonate (CaCO3) particles sizes (40 nm- 780 μm) with phosphoric acid (H3PO4) at room temperature (25℃). CaCO3 was first dissolved in deionized water at room temperature followed by the addition of H3PO4. The mixture was stirred until reaching a stable pH between 5.5-6.5 for 1 hour. The time taken to reach pH 5.5 increased from 12.5 minutes to 1140 minutes as the CaCO3 particle size increased from 40 nm to 780 μm. The slurry was filtered, dried in oven at a temperature of 80℃ for 24 hours then crushed with an agate mortar and calcined at a temperature of 850℃ to form the β-TCP phase. XRD quantitative analysis showed that the amount of the â-TCP synthesized from CaCO3 as the starting material decreased from 81.9% to 20.3% as the CaCO3 particle size increased from 40 nm to 780 μm. FESEM analysis showed that the morphology of CaCO3 as the starting material was not maintained after it was synthesized to β-TCP powder.

Anticancer Effects of Thymoquinone, Caffeic Acid Phenethyl Ester and Resveratrol on A549 Non-small Cell Lung Cancer Cells Exposed to Benzo(a)pyrene

Ulasli, Sevinc Sarinc,Celik, Sefa,Gunay, Ersin,Ozdemir, Mehmet,Hazman, Omer,Ozyurek, Arzu,Koyuncu, Tulay,Unlu, Mehmet Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.10

Background: Phytochemical compounds are emerging as a new generation of anticancer agents with limited toxicity in cancer patients. The purpose of this study was to investigate the potential effcts of thymoquinone, caffeic acid phenylester (CAPE) and resveratrol on inflammatory markers, oxidative stress parameters, mRNA expression levels of proteins and survival of lung cancer cells in Vitro. Materials and Methods: The A549 cell line was treated with benzo(a)pyrene, benzo(a)pyrene plus caffeic acid phenylester (CAPE), benzo(a)pyrene plus resveratrol (RES), and benzo(a)pyrene plus thymoquinone (TQ). Inflammatory markers, oxidative stress parameters, mRNA expression levels of apoptotic and anti-apoptotic proteins and cell viability were assessed and results were compared among study groups. Results: TQ treatment up-regulated Bax and down-regulated Bcl2 proteins and increased the Bax/Bcl2 ratio. CAPE and TQ also up-regulated Bax expression. RES and TQ down-regulated the expression of Bcl-2. All three agents decreased the expression of cyclin D and increased the expression of p21. However, the most significant up-regulation of p21 expression was observed in TQ treated cells. CAPE, RES and TQ up-regulated TRAIL receptor 1 and 2 expression. RES and TQ down-regulated the expression of NF-kappa B and IKK1. Viability of CAPE, RES and TQ treated cells was found to be significantly decreased when compared with the control group (p=0.004). Conclusions: Our results revealed up-regulation of the key upstream signaling factors, which ultimately cause increase in their regulatory p53 levels affecting the induction of G2/M cell cycle arrest and apoptosis. Overall these results provide mechanistic insights for understanding the molecular basis and utility of the anti-tumor activity of TQ, RES and CAPE.

Effect of IL-18 binding protein on hepatic ischemiareperfusion injury induced by infrarenal aortic occlusion

Mustafa Ozsoy,Yucel Gonul,Ahmet Bal,Ziya Taner Ozkececi,Ruchan Bahadir Celep,Fahri Adali,Omer Hazman,Ahmet Kocak,Murat Tosun 대한외과학회 2015 Annals of Surgical Treatment and Research(ASRT) Vol.88 No.2

Purpose: Severe local and systemic tissue damage called ischemia/reperfusion (IR) injury occurs during the period of reperfusion. Free oxygen radicals and proinflammatory cytokines are responsible for reperfusion injury. IL-18 binding protein (IL-18BP) is a natural inhibitor of IL-18. The balance between IL-18 and IL-18BP has an important role in the inflammatory setting. The present study aimed to investigate whether IL-18BP had a protective role in remote organ hepatic IR injury. Methods: Wistar-Albino rats were divided into three groups that contained seven rats. Group I (sham): Laparotomy and infrarenal abdominal aorta (AA) dissection were done but no clamping was done. Group II (I/R): The infrarenal AA was clamped by atraumatic microvascular clamp for 30 minutes and then was exposed to 90 minutes of reperfusion. Group III (IR + IL-18BP): 75 μg/kg of IL-18BP in 0.9% saline (1 mL) was administered 30 minutes before infrarenal AA dissection and clamping; 30 minutes of ischemia was applied and then was exposed to 90 minutes of reperfusion. Results: Serum AST, ALT, and LDH levels were remarkably higher in IR group and returned to normal levels in treatment group. The proinflammatory cytokine levels had decreased in treatment group, and was statistically significant compared with the IR group. Serum levels of total oxidant status and oxidative stress index decreased and levels of total antioxidant status increased by IL-18BP. Conclusion: This study suggested that IL-18BP has antioxidant, anti-inflammatory and hepatoprotective effects in cases of IR with infrarenal AA induced liver oxidative damage.