Portland-Limestone Cements

TLC, NMR, and IR spectroscopy were used throughout the process to identify ferrocene and acetylferrocene in addition to evaluating the levels of purity. Evidence: The objective of our experiments was to prepare acetylferrocene from ferrocene. The overall reaction was carried out using 6.1 equivalents of liquid acetic anhydride to 1.8 equivalents of phosphoric acid and concluded with an aqueous workup with NaOH. The initial reaction mixture containing ferrocene, acetic anhydride, and phosphate acid was mixed on a hot stir plate. During this period, reflux was observed, and the mixture appeared dark brown in color.

However it is porous and also it has got irregular shape. Dental Stone (Type III) Dehydration of gypsum under pressure in 125 degrees Celsius produces dental stone. This form of hemihydrate is called α-calcium sulfate. The powder particles of stone are much more regular (uniformed) in shape and it has higher density compared to model plaster. Dental Stone with High Strength and Low Expansion (Type IV) After accomplishment of dehydration, another chemical such as 30% calcium chloride or magnesium chloride is added whilst boiling of gypsum product.

The purpose of this experiment was to perform a Wittig reaction using two different methods: In method I, 250 mg aldehyde was mixed with 785 mg phosphonium salt in 5 M NaOH solvent. This mixture was stirred for thirty minutes and filter by vacuum filtration for the product. In method 2, 250 mg of aldehyde, 785 mg, benzyltriphenylphosphonium chloride, and 380 mg potassium phosphate tribasic were homogenize with a pestle and mortar. Vacuum filtration was also used in this method to attain the product. The products in both methods were used for recrystallization and TLC.

Turel and Patil (1996) [112] have established a rapid and selective method for the extraction of molybdenum with malachite green into nitrobenzene. The influence of solvent extraction variables on molybdenum extraction such as effect of pH, time of equilibration, solvents, effect of various anions and cations have been studied. On the basis of substoichiometric extraction method the constituent ratio of the metal-organic complexes was found as 1:1. The slope ratio method was also in agreement with the

4.2 Physical Analysis 4.2.1 Density Test Table 4.1 shows, the samples of undoped calcium phosphate pellets using various sintering temperature. From the experiment, different sintering temperatures are used such as 1000ºC, 1100ºC and 1200ºC. Each sintering temperature have five samples are being used to measure the density of the samples. After analysis, the average density will be collect and recorded. The summary that can get from the table is the mean density for 1000ºC, 1100ºC and 1200ºC sintering temperature is 3.24, 3.26 and 3.25 each respectively.

The same water was used for mixing and curing of concrete cubes. Name of Test Results Coarse Aggregate Fine Aggregate Specific gravity 2.56 2.63 Absorption (%) 0.51 0.71 Fineness Modulus 1.6 6.9 Table 3: Physical properties of aggregates Pozzolan: The cement replacement material that used in the test was local natural pozzolan from Mont Popa. The chemical composition of pozzolan is given in Table 4. It is evident that the local natural pozzolan conforms to the requirements of ASM C 618 and hence, can be used as a partial replacement of the production of roller compacted concrete. Description Composition (%) Local Natural Pozzolan Requirements as per ASTM for class N Silicon dioxide (SiO2), aluminum oxide (Al2O3) and iron oxide (Fe2O3) 77.3 Min 70.00 Sulfur trioxide (SO3) 0.34 Max 4.00 Loss on ignition (%) 2.26 Max 10.00 Table 4: Comparison of local natural pozzolan with Class N of ASTM C 618 Method: The soil compaction method is the most widely used mixture proportioning method for RCC pavements.

1. Conventional Glass Ionomer cement: Ketac-Cem (3M ESPE, Germay) 2. Resin-modified Glass Ionomer cement: GC Fuji Orthoband (Japan) 3. Polyacid - modified Composite cement: Ultra Band-lok (Reliance Orthodontics, USA) 3. Bands Two types of contoured pre-formed bands for premolars were used in the study.

This experiment is carried out to determine the percentage of calcium carbonate, CaCO3 in the toothpaste provided with the experimental technique known as back titration. A back titration is also known as indirect titration. A known mass of toothpaste is neutralised with a known concentration and volume of hydrochloric acid, HCl. The mixture is then further neutralised by a known concentration and volume of sodium hydroxide solution, NaOH to determine the number of mole of HCl that reacted with CaCO3 in the toothpaste. As the number of mole of CaCO3 is found through the mole ratio thus the mass of CaCO3 is known and the percentage of CaCO3 can be calculated.

The bacterial suspension (100 µL 108 CFU) was spread uniformly on the nutrient agar plate and 50 µL solution of each of PS and Ag/ PS prepared in DMSO was loaded in each well on nutrient agar plate The plate was then put in incubator for 24 hour at 37 °C to record inhibition zone [38]. 4.3 Viable cell counting

A total of 30 g of seaweed Sargassum sp. washed and dried. The dried seaweed soaked in a solution of 0.4% formalin for 6 hours and 1% HCl solution for 1 hour and then washed with distilled water to pH neutral. Furthermore, seaweed cut added a solution of Na2CO32% with a ratio of 1:30 (w/v). Subsequently extracted by Microwave at power level 70 for 16 minutes and then filtered.