Lodrick Makokha Wangatia

Jimma University

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Bin Sun

Donghua University

Olu Emmanuel Femi

Jimma University

Esayas Alemayehu

Jimma University

Israel Leka Lera

Wolkite University

Sutripto Khasnabis

University of British Columbia

Praveen C. Ramamurthy

Indian Institute of Science Bangalore

Tesfamariam Teklu

Mekelle University

Meifang Zhu

Donghua University

Ting Zeng

University of Electronic Science and Technology of China

Josphat Igadwa Mwasiagi

Moi University

Cooperative Institutions

Donghua University

Jimma University

Bahir Dar University

Materials Science & Engineering

State Key Laboratory for Modification of Chemical Fibers and Polymer Materials

Moi University

Debre Markos University

Chinese Academy of Sciences

Indian Institute of Science Bangalore

National Taiwan University of Science and Technology

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Polypropylene Nanocomposites Based on Synthetic Organic-Soluble Ag Nanocrystals with Prominent β-nucleating Effect: Quiescent Crystallization and Melting Behavior

Journal of Macromolecular Science Part B (2012)

Yuyuan Shi Bin Sun Zhe Zhou Lodrick Makokha Wangatia Long Chen

Differential scanning calorimetry, x-ray diffraction, and polarized optical microscopy were used to investigate the quiescent crystallization and melting behavior of isotactic polypropylene (iPP) nanocomposites based on synthetic organic-soluble Ag nanocrystals (NCs). The effects of Ag loading and crystallization temperature on the crystallization behavior and crystalline structure were studied. The results showed that the synthetic Ag NCs as a novel effective β-crystal nucleating agent for iPP could promote the overall crystallinity, decrease the size of spherulites, and induce the formation of large amounts of β-crystals in the nanocomposites under quiescent crystallization. The relative content of β-crystals significantly increased with increasing Ag loading, and slightly increased with decreasing crystallization temperature. The quiescent crystallization kinetics was analyzed using the Avrami model. The results showed that the iPP nanocomposites with added Ag NCs had higher crystallization rate constant (k) and lower crystallization half-times (t1/2) as well as the Avrami exponent (n) than pure iPP, indicating that the presence of Ag NCs acted as heterogeneous nucleating sites and promoted the crystallization rate of iPP.

Tacticity

Polypropylene

Avrami equation

10.1080/00222348.2012.680374

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Citations (7)

In situ deposition of polyaniline onto sisal fibers and removal efficiency for chromium(VI) from aqueous solution: structure and adsorption studies

Tesfamariam Teklu Gebretsadik Lodrick Makokha Wangatia Esayas Alemayehu

In the present study, polyaniline (PAni) was coated on the surface of sisal fibers (SF) through in situ oxidative polymerization method which was further characterized using FT-IR, UV-Vis, XRD, SEM and EDX instruments. PAni/SF composite was tested to remove potentially harmful hexavalent chromium(Cr VI ) from simulated waste water on batch adsorption experiment as a function of adsorption variables such as contact time, solution pH, particle size, adsorbent dose and adsorbate dose. It was observed that adsorption of Cr(VI) is highly susceptible to pH change with maximum adsorption removal (93.1%) and adsorption capacity (12.7 mg/g) achieved at pH 4. Studies on adsorption reaction revealed adsorption process followed pseudo second order kinetics confirming chemisorption as rate determining step. The isotherm data was suitably fitted to Langmuir model with maximum adsorption capacity (q m ) 17.86 mg/g when all adsorption variables were optimized.

Hexavalent Chromium

Chemisorption

Langmuir adsorption model

10.48442/imist.prsm/jasi-v3i1-3.11304

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Citations (2)

An innovative catalyst of PdNiP nanosphere deposited PEDOT:PSS/rGO hybrid material as an efficient electrocatalyst for alkaline urea oxidation

Polymer Bulletin (2022)

Israel Leka Lera Sutripto Khasnabis Lodrick Makokha Wangatia Olu Emmanuel Femi Praveen C. Ramamurthy

Phosphide

Poly(N-isopropylacrylamide)

Alkaline fuel cell

10.1007/s00289-022-04100-w

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Citations (4)

Effect of surface modification of sisal fibers on water absorption and mechanical properties of polyaniline composite

Polymer Composites (2017)

Tesfamariam Teklu Lodrick Makokha Wangatia Esayas Alemayehu

This article presents the surface modification of sisal ( Agave sisalana ) fibers by alkalization to tune up mechanical limitations of natural fibers‐reinforced polymer composites associated with poor fiber‐polymer matrix compatibility. Upon surface treatment, the fibers were surface coated with polyaniline through in situ oxidative polymerization to further enhance resistance to water absorption by introducing hydrophobic polymer backbone. Based on the results from spectroscopic and microscopic analyses, surface modification through alkalization is an effective approach to remove lignin and hemicellulose from the surface of sisal fibers. It also enhanced fiber‐polymer matrix compatibility assured by a significant increase in tensile strength. Polyaniline deposition on the surface of sisal fibers was successful to introduce hydrophobic polymer backbone to the system to enhance resistance to water absorption, thereby increasing tensile strength significantly. POLYM. COMPOS., 40:E46–E52, 2019. © 2017 Society of Plastics Engineers

SISAL

Surface Modification

In situ polymerization

10.1002/pc.24462

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Citations (24)

Mango Bark Mordant for Dyeing Cotton with Natural Dye: Fully Eco-Friendly Natural Dyeing

International Journal of Textile Science (2015)

Lodrick Makokha Wangatia Kidist Tadesse Senelisile Moyo

Use of metal salts mordants in naturally dyed textile products make them not fully environmental friendly. We have investigated mango bark extract possibility of being used as a mordant. The natural dye used was extracted from bitter leaves and pre or post mordanted with mango bark extract, the amount of dye in the sample after dyeing and after washing was tested using CIELAB equipment, UV-Vis absorption spectroscopy and wash fastness test. Comparing the mango bark mordanted sample with control samples which included; un-mordanted sample and samples mordanted with copper II sulphate, significant mordanting effect was confirmed which was even better than the conventional mordant used. Further investigation revealed that post mordanting with mango extract gives better wash fastness performance than pre-mordanting. This study forms an important basis on which many more natural materials can be developed to be used as mordants when dyeing not only cotton but other textile products made from other fibers.

Mordant

Environmentally Friendly

Natural dye

Textile

Source

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Citations (24)

Synthesis and Solution Self-Assembly Behavior of Porphyrin Tethered by Fullerene C<sub>60</sub>

Advanced materials research (2013)

Wilson Lelei Sitienei Lodrick Makokha Wangatia Ting Zeng Bin Sun Mei Fang Zhu

This paper focuses on the synthesis, spectroscopic studies and self-assembly behavior of porphyrin phenyl linked fullerene C60 dyad, which included COOH groups in its fullerene unit so as to promote its adsorption onto TiO2. UV-Vis spectrum and steady-state fluorescence spectrum measurement, showed that the self-assembly of this compound in different solvents with different polarities. The results show that the soret absorption peak slightly blue shifted by 5 nm in acetonitrile and 2 nm in tetrahydrofuran, while the soret peaks in toluene solution was the same as in chloroform. Increasing concentration from 1x10-6 mol/L to 2x10-5 mol/L in chloroform resulted into aggregation, also the slight red shifting on cooling from 900C to 100C was observed from a temperature dependant UV-Vis absorption spectra, thus indicates aggregation. All these features may indicate presence of J-type aggregation happening in 4-methylphenyl-H2porhyrin-fullerene C60-COOH. In addition, the fluorescence of 4-methylphenyl-H2Porhyrin-fullerene C60-COOH has been quenched compared to that of pure 4-methylphenyl-H2porhyrin-OH under the same concentration. Therefore, this novel material design may find good application in photoelectric devices.

Tetrahydrofuran

10.4028/www.scientific.net/amr.668.696

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Citations (2)

Sisal fibers coated with conducting polyaniline: Property and structural studies

Polymer Science Series B (2017)

Tesfamariam Teklu Lodrick Makokha Wangatia Esayas Alemayehu

SISAL

Agave

Polyaniline nanofibers

Surface Modification

10.1134/s1560090417050153

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Citations (10)

Removal of Pb(II) from aqueous media using adsorption onto polyaniline coated sisal fibers

Journal of Vinyl and Additive Technology (2018)

Tesfamariam Teklu Lodrick Makokha Wangatia Esayas Alemayehu

Lead is one of the toxic metals that cause detrimental health disorders. Polyaniline (PAni) coated sisal fibers were prepared via in situ polymerization and used to remove Pb(II) from wastewater. PAni/SF was investigated on batch experiment to remove Pb(II) from wastewater as a function of contact time, pH, particle size, adsorbent, and adsorbate dose. Studies on kinetics revealed adsorption of Pb(II) obeyed pseudo second order. Adsorption equilibrium was suitably fitted in Langmuir isotherm with linear coefficient 0.99. Finally, PAni/SF composites show appreciable removal efficiency with a maximum adsorption capacity of 6.53 mg/g, consistent with adsorption capacity obtained from pseudo second order. J. VINYL ADDIT. TECHNOL., 25:189–197, 2019. © 2018 Society of Plastics Engineers

Langmuir adsorption model

SISAL

10.1002/vnl.21652

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Citations (16)

Synthesizing High-Strength Biodegradable Polymer Film from Ethiopian False Banana Pseudo-Stem Using POSS and Chitosan as a Filler

Journal of Packaging Technology and Research (2022)

Hawi Ketema Hirpa Lodrick Makokha Wangatia Sultan Mulisa Demboba

Thermal Stability

Filler (materials)

Elongation

Plasticizer

10.1007/s41783-022-00135-6

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Citations (2)

Reactive bay functionalized perylene monoimide-polyhedral oligomeric silsesquioxane organic electronic dye

Materials Science-Poland (2015)

Lodrick Makokha Wangatia Bin Sun Ting Zeng Meifang Zhu

Abstract Aggregation-induced quenching is particularly detrimental in perylene diimides, which are characterized by a near-unity fluorescence quantum yield in solution but are far less emissive in the solid state. Previously, perylene diimide has been improved by linking it to the inorganic cage of polyhedral oligomeric silsesquioxanes. As a further study on perylene diimidepolyhedral oligomeric silsesquioxanes, we report on a double functionalized molecular structure, which can be used for substitution at the bay area and as a side group in other materials. Typical solution absorption and emission features of the perylene diimide fragment have been observed in this new reactive perylene diimide-polyhedral oligomeric silsesquioxane. Moreover, reduced stacking during aggregation and spherical particles exhibiting solid fluorescence have been obtained. Organic semiconducting material with enhanced solid state photophysical properties, like solid fluorescence is a subject of great interest owing to its possible high-tech applications in optoelectronic devices.

Diimide

Silsesquioxane

Quantum yield

10.1515/msp-2015-0016

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Citations (1)