Alfred Antony Christy

• Prathumsuwan, Thitarat; Kladsomboon, Sumana; Christy, Alfred Antony; In, Insik; Liang, Xiao & Song, Shufeng [Vis alle 10 forfattere av denne artikkelen] (2024). Integration of jackfruit seed-derived carbon dots and electronic nose for a sensitive detection of formaldehyde vapor. Journal of Metals, Materials and Minerals. 34(1). doi: 10.55713/jmmm.v34i1.1864.
• Christy, Alfred Antony; Sukumar, Raveena & Wije Munige, Shakya Sankalpani Gunasena (2023). Preparation and Infrared Spectroscopic Studies of Fully Deuterium Oxide Replaced Analogue of Calcium Oxalate Monohydrate. Asian Journal of Chemistry. ISSN 0970-7077. 35(4), s. 1014–1018. doi: 10.14233/ajchem.2023.27271. Vis sammendrag

  The present research work reports the preparation of 100% deuterium oxide replaced the analogue of calcium oxalate monohydrate (COM) for the first time. The replacement of crystalline water in COM was carried out in a water-free environment by shaking a portion of the sample of COM with a calculated amount of deuterium oxide. Several experiments were conducted to study both partially deuterium oxide replaced samples and the composition of water/deuterium oxide in the liquid phase. Reflectance spectroscopy was used in analyzing the solid and liquid samples using special sample accessories. Furthermore, a full deuterium oxide replaced sample was exposed to atmospheric water to study the exchange of deuterium oxide molecules from the solid samples with water molecules. The results show that the full deuterium oxide replaced COM can be prepared using a suitable water-free environment. The infrared spectra of these samples clearly show that the water molecules in the crystal structure were replaced by deuterium oxide molecules assuming identical positions in the crystal structure. However, the bands arising from the deuterium oxide molecules were narrower than the bands due to water molecules. The analysis of the liquid samples during the partial deuterium oxide replacement shows that the replacement of the water of crystallization by deuterium oxide is 60% after 6 h of shaking. The full deuterium oxide replaced sample exposed to atmospheric water shows that the replacement of deuterium oxide by water molecules from the vapour phase is a slow process.

• Jayathilake, Madhawa; Rudra, Souman & Christy, Alfred Antony (2021). Effect of co-liquefaction of lignin and laminaria saccharina on optimization of bio-oil yield. Energy Conversion and Management: X. doi: 10.1016/j.ecmx.2021.100151.
• Jayathilake, Madhawa; Rudra, Souman; Akhtar, Naureen & Christy, Alfred Antony (2021). Characterization and Evaluation of Hydrothermal Liquefaction Char from Alkali Lignin in Subcritical Temperatures. Materials. ISSN 1996-1944. 14(11). doi: 10.3390/ma14113024. Fulltekst i vitenarkiv
• Christy, Alfred Antony & Sivarukshy, Pathmanathan (2021). Comparison of adsorption properties of commercial silica and rice husk ash (RHA) silica: A study by NIR spectroscopy. Open Chemistry. ISSN 2391-5420. 19(1), s. 426–431. doi: 10.1515/chem-2021-0044. Fulltekst i vitenarkiv
• Christy, Alfred Antony; Rathnaweera, Thilini Nisansala & Halanayake, Kalana Dasunpriya (2021). Desiccant Properties Comparison of Natural Bio-polymers. Journal of Applied Sciences. ISSN 1812-5654. 21(1), s. 1–9. doi: 10.3923/jas.2021.1.9. Fulltekst i vitenarkiv
• Christy, Alfred Antony; Phetcharee, Kulpriya & Hadsarung, Rungsima (2020). Characterization of Silica Extracted from Rice Husk by NIR Spectroscopy and its Application in Separation Science. Key Engineering Materials. ISSN 1013-9826. 853, s. 243–247. doi: 10.4028/www.scientific.net/KEM.853.243.
• Shanmugaratnam, Sivagowri; Velauthapillai, Dhayalan; Christy, Alfred Antony; Ravirajan, Punniyamoorthy & Shivatharsiny, Yohi (2019). CoS2/TiO2 Nanocomposites for Hydrogen Production under UV Irradiation. Materials. ISSN 1996-1944. 12(23), s. 1–9. doi: 10.3390/ma12233882. Fulltekst i vitenarkiv
• Fernando, H.A.; Raveendran, Praveena; Christy, Alfred Antony & Velauthapillai, Dhayalan (2019). Water Adsorption Properties of Titanium(IV) Oxide Embedded in Multiwalled Carbon Nanotubes (CNT). Key Engineering Materials. ISSN 1013-9826. 803, s. 182–186. doi: 10.4028/www.scientific.net/KEM.803.182.
• Hiranmartsuwan, Peraya; Siangdee, Natthaya & Christy, Alfred Antony (2019). Surface Functionality and Water adsorption studies of alpha aluminium (111) oxide nanoparticles by Near Infrared Spectroscopy. Key Engineering Materials. ISSN 1013-9826. 803(104), s. 104–108. doi: 10.4028/www.scientific.net/KEM.803.104. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2018). Effect of UV Irradiation on Conjugated Linoleic Acid (9c 11t and 10t 12c). Journal of Chemical and Pharmaceutical Research. ISSN 0975-7384. 10(8), s. 17–24. Fulltekst i vitenarkiv Vis sammendrag

  This study was carried out to examine the effects of UVA irradiation on the Conjugated Linoleic Acid (CLA) isomers; 9c11t CLA and 10t12c CLA. CLA 9c11t free fatty acid (90%) and 10t12c-Octadecadienoic acid methyl ester (90%) samples in UV transparent cuvettes sealed under nitrogen gas were subjected to UVA irradiation at 365 nm. About four drops of each sample were taken out at regular intervals. These irradiated samples were analyzed using IR spectroscopy and Gas Chromatography (GC). The second derivative profiles of the IR spectra of UVA irradiated 9c11t CLA and 10t12c CLA show the decrease in intensity of the peaks at wavenumbers at 944 and 986. Furthermore, a slight increase in the intensity of the peak at around 967/cm and a slight blue shift of the peak at 984 to 988/cm are also observed. The GC peaks corresponding to tt CLA isomers increase in intensity showing the isomerization of methylene interrupted 18:2 linoleic acid to tt isomers of Conjugated Linoleic Acids. Furthermore, formation of oleic acid (!8:1 9c) in the irradiated sample of 9c11t free fatty acid and formation of oleic and elaidic acid (18:1 9t) in the irradiated sample of 10t12c methyl ester also observed. The results clearly indicate the depletion of conjugated linoleic acids during UV irradiation.

• Sangpongpitthaya, Tanyapa; Christy, Alfred Antony & Thorstensen, Rein Terje (2018). Quantitative Determination of Calcium Hydroxide by using Near Infrared Spectroscopy. Key Engineering Materials. ISSN 1013-9826. 765, s. 300–304. doi: 10.4028/www.scientific.net/KEM.765.300. Fulltekst i vitenarkiv
• Prathumsuwan, Thitarat; Christy, Alfred Antony & Thorstensen, Rein Terje (2018). Hydration Chemistry of Cement Studied by Near Infrared Spectroscopy. Key Engineering Materials. ISSN 1013-9826. 765 KEM, s. 309–313. doi: 10.4028/www.scientific.net/KEM.765.309. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2017). An Insight into the Isomerization Chemistry of Methyl Linolenate. Journal of Chemical and Pharmaceutical Research. ISSN 0975-7384. 9(9), s. 140–145. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2017). Changes in Unsaturated Fatty Acid Profiles of Some Vegetable Oils during Frying at Medium Frying Temperature. Journal of Chemical and Pharmaceutical Research. ISSN 0975-7384. 9(10), s. 223–226. Fulltekst i vitenarkiv
• Christy, Alfred Antony & Rifla, Raziq (2017). Determination Of Kinetic Parameters For The Thermally Induced Isomerization Of Methyl Linolenate. Advances in Natural and Applied Sciences. ISSN 1995-0772. 11(8), s. 604–612. Fulltekst i vitenarkiv
• Angkuratipakorn, Thamonwan; Singkhonrat, Jirada & Christy, Alfred Antony (2017). Comparison of Water Adsorption Properties of Cellulose and Cellulose Nanocrystals Studied by Near-Infrared Spectroscopy and Gravimetry. Key Engineering Materials. ISSN 1013-9826. 735 KEM, s. 235–239. doi: 10.4028/www.scientific.net/KEM.735.235. Fulltekst i vitenarkiv
• Christy, Alfred Antony & Soonthenhut, Siraporn (2017). Water Structure in Proteins in Solid State Studied by Near Infrared Spectroscopy. Key Engineering Materials. ISSN 1013-9826. 735 KEM, s. 168–172. doi: 10.4028/www.scientific.net/KEM.735.168. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2016). Heat induced synthesis of linolenic acid isomers-A reference standard . Advances in Natural and Applied Sciences. ISSN 1995-0772. 10(17), s. 19–22.
• Christy, Alfred Antony & Fernando, N.R. (2016). Thermally induced chemical reactions in castor oil studied by infrared spectroscopy and gas chromatography: Determination of activation energy for the dehydration of ricinoleic acid. Advances in Natural and Applied Sciences. ISSN 1995-0772. 10(13), s. 146–156. Fulltekst i vitenarkiv
• Christy, Alfred Antony & Arachchi, Subashini L. (2016). Thermally Induced Cis-Trans Isomerisation in Trilinolein Studied by Infrared Spectroscopy and Gas Chromatography. Advances in Natural and Applied Sciences. ISSN 1995-0772. 10(4), s. 168–176. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2016). Water adsorption properties of free and dehydrated β-cyclodextrin studied by near infrared spectroscopy and gravimetry. Key Engineering Materials. ISSN 1013-9826. 689, s. 143–147. doi: 10.4028/www.scientific.net/KEM.689.143. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2015). Insights into the Chemistry of Adsorption of Water Molecules by Cyclodextrins as Studied by Near Infrared Spectroscopy. Advances in Natural and Applied Sciences. ISSN 1995-0772. 9(14), s. 7–13. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2015). The Adsorption of Water Molecules on Titanium (iv) Oxide Surface as Studied by Near Infrared Spectroscopy. Advances in Natural and Applied Sciences. ISSN 1995-0772. 9(14), s. 14–19. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2015). Adsorption and Dehydration of Water Molecules from α, β and γ Cyclodextrins-A study by TGA analysis and gravimetry. Advanced Materials Research. ISSN 1022-6680. 1120-1121, s. 886–890. doi: 10.4028/www.scientific.net/AMR.1120-1121.886. Fulltekst i vitenarkiv
• Christy, Alfred Antony; Barth, Tanja & Francis, George William (2014). Preliminary photochemical studies of fluorene in various aqueous media. American Journal of Scientific and Industrial Research. ISSN 2153-649X. 5, s. 97–103. doi: 10.5251/ajsir.2014.5.3.97.103. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2014). Comparison of water adsorption characteristics of oligo and polysaccharides of α-glucose STUDIED by near infrared spectroscopy. Advanced Materials Research. ISSN 1022-6680. 1035, s. 476–482. doi: 10.4028/www.scientific.net/AMR.1035.476. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2014). Adsorption of alcohols onto zinc selenide (ZnSe) crystal surface. Advanced Materials Research. ISSN 1022-6680. 1035, s. 277–280. doi: 10.4028/www.scientific.net/AMR.1035.277. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2014). The Nature of Silanol Groups on the Surfaces of Silica, Modified Silica and Some Silica Based Materials. Advanced Materials Research. ISSN 1022-6680. 998-999, s. 3–10. doi: 10.4028/www.scientific.net/AMR.998-999.3. Fulltekst i vitenarkiv
• Christy, Alfred Antony (2013). Near Infrared Spectroscopic Study on the Adsorption of Methanol on Silica Gel. Advanced Materials Research. ISSN 1022-6680. 650, s. 150–155. doi: 10.4028/www.scientific.net/AMR.650.150.
• Christy, Alfred Antony (2013). The nature of rest silanol groups on the surfaces of silica based solid phase extraction materials. Advanced Materials Research. ISSN 1022-6680. 650, s. 66–71. doi: 10.4028/www.scientific.net/AMR.650.66.
• Christy, Alfred Antony (2013). Chemistry of desiccant properties of carbohydrate polymers as studied by near-infrared spectroscopy. Industrial & Engineering Chemistry Research. ISSN 0888-5885. 52(12), s. 4510–4516. doi: 10.1021/ie302199k.
• Christy, Alfred Antony (2012). Effect of Heat on the Adsorption Properties of Silica Gel. International Journal of Engineering and Technology. ISSN 1793-8236. 4(4), s. 484–488. doi: 10.7763/ijet.2012.v4.416. Vis sammendrag

  Adsorption properties of silica gel have been attributed to the surface hydroxyl groups of silica gel. Some hydroxyl groups are free standing and called free silanol groups. Some are hydrogen bonded to neighbouring silanol groups. Christy has shown that a high silanol number and a balanced concentration proportionality between these two different types of hydroxyl groups is necessary for effective adsorption of water molecules. Thermal treatment of silica gel samples alters the proportions of these groups and the above fact was investigated by using thermally treated silica gel samples. Two silica gel samples of varying surface areas and silanol numbers were dried under vacuum at 200 oC and their adsorption characteristics were followed by using NIR spectroscopy. Then the samples were subjected to heating at 350, 450, 600 degrees to cause changes in the concentrations of the surface silanol groups and their surface and adsorption characteristics were followed. The results clearly indicate that the heating process both remove free and hydrogen bonded silanol groups and alter the ratio between the two. Furthermore, the heating causes reduction in silanol umber and upsets the balance in the proportionality of the silanol groups for effective adsorption of water molecules.

• Christy, Alfred Antony; Nkansah, Marian Asantewah & Barth, Tanja (2012). Catalytic oxidation and reduction of polycyclic aromatic hydrocarbons (PAHs) present as mixtures in hydrothermal media. Polycyclic aromatic compounds (Print). ISSN 1040-6638. 32(3), s. 408–422. doi: 10.1080/10406638.2012.663451.
• Francis, George William; Christy, Alfred Antony & Øygarden, Jostein (2012). Pyrolytic formation of pyrolytic aromatic hydrocarbons from sesquiterpenes. Food Chemistry. ISSN 0308-8146. 135(3), s. 1316–1322. doi: 10.1016/j.foodchem.2012.06.033.
• Nkansah, Marian Asantewah; Christy, Alfred Antony; Barth, Tanja & Francis, George William (2012). The use of lightweight expanded clay aggregate (LECA) as sorbent for PAHs removal from water. Journal of Hazardous Materials. ISSN 0304-3894. 217, s. 360–365. doi: 10.1016/j.jhazmat.2012.03.038. Vis sammendrag

  Lightweight expanded clay aggregate (LECA) has been explored as a sorbent for the removal of PAHs (phenanthrene, fluoranthene and pyrene) from water. The efficacy of LECA as a sorbent for PAHs was assessed using contact time, mass of sorbent and sorption isotherms in a series of batch experiments. Maximum (optimum) sorption was reached at 21 h after which the amount of PAHs sorbed remained almost constant. Batch experiments were conducted by shaking a 100 ml solution mixture of individual PAHs (containing 0.02 mg/L) with LECA. The maximum sorption was 70.70, 70.82 and 72.12%, respectively for phenanthrene, fluoranthene and pyrene when a mass of 0.2 g of sorbent was used. There was an increase in sorption as a result of an increase in mass of sorbent until a maximum was reached at a mass of 4.0 g LECA with 92.61, 93.91 and 94.15% sorption of phenanthrene, fluoranthene and pyrene respectively. Sorption data were fitted to the linearised forms of the Freundlich and Langmuir isotherm models to determine the water-LECA partitioning coefficient. Physical sorption caused by the aromatic nature of the compounds was the main mechanism that governed the removal process while the hydrophobicity of the PAHs also influenced the sorption capacity. LECA can be used as an alternative method for aqueous PAHs removal.

• Bobon, Miroslav; Christy, Alfred Antony; Kluvanec, Daniel & Illusova, Ludmilla (2011). State of water molecules and silanol groups in opal minerals: a near infrared spectroscopic study of opals from Slovakia. Physics and chemistry of minerals. ISSN 0342-1791. 38(10), s. 809–818. doi: 10.1007/s00269-011-0453-0.

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• Christy, Alfred Antony (2021). General Chemistry: The Basics. McGraw-Hill. ISBN 978-1-3076-9222-8. 450 s.
• Christy, Alfred Antony (2020). General Chemistry: The basics. Mcgraw Hill. ISBN 9781307606522. 412 s.

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• Christy, Alfred Antony (2022). Session Chairman-Material science conference .
• Christy, Alfred Antony (2022). Instrumental analysis- Hydration of Cement studied by Near Infrared Spectroscopy.
• Storaas, Vigleik & Christy, Alfred Antony (2022). Instrumental analysis- UV and Infrared spectroscopy.
• Christy, Alfred Antony (2022). Organic Chemistry Basics- Esters and related compounds.
• Christy, Alfred Antony (2022). Organic Chemistry-Fatty acids.
• Phetcharee, Kulpriya; Hadsarung, Rungsima & Christy, Alfred Antony (2020). Characterization of Silica Extracted from Rice Husk by NIR Spectroscopy and its Application in Separation Science.
• Christy, Alfred Antony (2020). Near Infrared spectroscopy in Industry: The importance and determination of calcium hydroxide in cement.
• Christy, Alfred Antony (2019). The importance and determination of calcium hydroxide in cement by Near infrared spectroscopy .
• Christy, Alfred Antony (2019). Dehydration of cement studied by Therogravimetric analysis.
• Christy, Alfred Antony (2018). Applications of NIR spectroscopy in Material Science.
• Christy, Alfred Antony (2018). Importance of calcium hydroxide or its Dehydration studied by TGA analysis.
• Christy, Alfred Antony & Thorstensen, Rein Terje (2018). Quantitative determination of calcium hydroxide in concrete by near infrared spectroscopy.
• Christy, Alfred Antony (2018). Applications of Near Infrared Spectroscopy.
• Christy, Alfred Antony (2018). operational principles of spectroscopic techniques.
• Christy, Alfred Antony (2018). Quantitative Determination of Calcium Hydroxide in Cement by Near Infrared Spectroscopy.
• Christy, Alfred Antony (2018). Water Adsorption Properties of Malto-Oligosaccharides and Cyclodextrins Studied by near Infrared Spectroscopy and Gravimetry.
• Christy, Alfred Antony (2017). spectroscopy and chromatography.
• Christy, Alfred Antony (2017). instrumental analysis.
• Christy, Alfred Antony (2017). Titanium oxide and water adsorption.
• Christy, Alfred Antony (2017). Heat Induced Isomerization and auto oxidation reactions of C18 unsaturated fatty acids in edible oils.
• Christy, Alfred Antony (2017). Applications of Near Infrared Spectroscopy in Material Science- Analysis of hydroxyl groups on surfaces.
• Christy, Alfred Antony (2017). The state of water in cement studied by near infrared spectroscopy.
• Christy, Alfred Antony (2017). Thermal Stability Of The Isomers Of Linolenic Acid.
• Christy, Alfred Antony (2017). Some applications of NIR spectroscopy in studying water structure in material science.
• Christy, Alfred Antony (2016). UV/Visible and Infrared spectroscopy.
• Christy, Alfred Antony (2016). Spectroscopic techniques in Chemistry.
• Christy, Alfred Antony (2016). Thermally Induced Dehydration of Castor Oil Studied by Infrared Spectroscopy and Gas Chromatography.
• Christy, Alfred Antony (2016). Applications of Near Infrared Spectroscopy in the Analysis of Surface Hydroxyl Groups on solid surfaces.
• Christy, Alfred Antony (2016). Thermally induced cis-trans isomerization in trilinolein studied by infrared spectroscopy and gas chromatography.
• Christy, Alfred Antony (2016). Applications of Near Infrared Spectroscopy in the Analysis of Water Adsorption on Hydroxyl Groups of solid samples.
• Christy, Alfred Antony (2016). Applications of near infrared spectroscopy in the analysis of hydroxyl groups on solid samples.
• Christy, Alfred Antony (2016). Water adsorption properties of free and dehydrated β-cyclodextrin studied by near infrared spectroscopy and gravimetry.
• Christy, Alfred Antony (2015). Instrumental analysis: Chromatography.
• Christy, Alfred Antony (2015). Instrumental analysis: Spectroscopy.
• Christy, Alfred Antony (2015). Frying in edible oils: How safe it is?
• Christy, Alfred Antony (2015). Water adsorption characteristics of cyclodextrins studied by NIR spectrometry and gravimetry.
• Christy, Alfred Antony (2015). Adsorption and dehydration of water molecules from alpha, beta and gamma cyclodextrins-A study by TGA and gravimetry.
• Christy, Alfred Antony (2014). Theory and Practice of Mass spectrometry and Nuclear Magnetic Resonance Spectrometry.
• Christy, Alfred Antony (2014). Theory and practice of UV and Infrared spectroscopy.
• Christy, Alfred Antony (2014). Applications of Near Infrared Spectroscopy in the Analysis of Water Adsorption on Hydroxyl Groups of solid samples.
• Christy, Alfred Antony (2013). Hydration and dehydration of oligosaccharides studied by NIR spectroscopy.
• Christy, Alfred Antony (2013). Water adsorption characteristics of acyclic oligosaccharides of α-glucose studied by Near Infrared Spectroscopy.
• Christy, Alfred Antony (2013). A COMPARATIVE STUDY OF THE CHEMISTRY OF DESICCANT PROPERTIES BETWEEN OLIGOSACCHARIDES AND POLYSACCHARIDES BY NIR SPECTROSCOPY.
• Christy, Alfred Antony (2013). The adsorption chemistry of polysaccharide dessicants.
• Christy, Alfred Antony (2013). Chemistry of the desiccant properties of oligosaccharides and carbohydrate polymers.
• Christy, Alfred Antony (2012). Rest silanol groups on solid phase extraction materials.
• Christy, Alfred Antony (2012). Study of adsorption of alcohol on silica gel.
• Christy, Alfred Antony (2012). Transforming a service laboratory into a research institute.
• Christy, Alfred Antony (2012). The nature of hydroxyl groups on silica gel surface.
• Christy, Alfred Antony (2012). Research and teaching with Erasmus students.
• Christy, Alfred Antony (2012). Effect of modifications of silanol groups on silica gel.
• Christy, Alfred Antony (2012). State of water molecules and silanol groups in Opal minerals and carbohydrates.
• Christy, Alfred Antony (2012). Pyrolysis of sesquiterpenes yields polyaromatiske hydrocarbons.
• Christy, Alfred Antony (2012). Effect of tailoring surface silanol groups on adsorption properties of silica gel-A near infrared spectroscopic study.
• Nkansah, Marian Asantewah; Christy, Alfred Antony & Barth, Tanja (2011). A Preliminary Study on Adsorption of PAH from Water by (Lightweight Expanded Clay Aggregate) LECA.
• Nkansah, Marian Asantewah; Christy, Alfred Antony & Barth, Tanja (2011). Catalytic redox hydrous pyrolysis degradation of anthracene, fluorene and fluoranthene.
• Christy, Alfred Antony (2011). Effect of hydrothermal treatment on adsorption properties of silica gel.
• Christy, Alfred Antony; Miroslav, B; Kluvanec, Daniel & Illasova, L (2011). STATE OF WATER MOLECULES AND SILANOL GROUPS IN OPAL MINERALS: A NEAR INFRARED SPECTROSCOPIC STUDY OF OPALS FROM SLOVAKIA.
• Christy, Alfred Antony; Stawski, Dawid; Połowiński, S & Bellmann, C (2011). Deposition of Polyaniline Layers on Polypropylene Nonwoven.
• Christy, Alfred Antony (2011). A near infrared spectroscpic study of opals from Slovakia.
• Christy, Alfred Antony (2011). State of water molecules and silanol groups in Opal minerals: A near infrared spectroscpic study of opals from Slovakia.

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