Recently developed applications for natural hydrophilic polymers

Halake, Kantappa; Kim, Hyun Jin; Birajdar, Mallinath S.; Kim, Byoung Soo; Bae, Harim; Lee, CheongCheon; Kim, Yoo Jin; Kim, Sinwoo; Ahn, Soohwan; An, Su; Jung, Seung Hwan; Lee, Jonghwi

doi:10.1016/j.jiec.2016.06.011

Cited by 38 publications

(14 citation statements)

References 240 publications

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“…In the realm of integrated circuit (IC) industries, chemical mechanical planarization (CMP) has acquired immense attention till date. 1 There are different applications of CMP in the process of IC fabrication, among which front-end-ofline (FEOL) and back-end-of-line (BEOL) processes hold significant importance. 2 The materials used for gap-filling, such as silicon dioxide, are polished during FEOL stage.…”

Section: Introductionmentioning

confidence: 99%

Urea as a complexing agent for selective removal of Ta and Cu in sodium carbonate based alumina chemical–mechanical planarization slurry

Shukla

Selvam

Manivannan

2022

JSCS

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This work reports urea as a promising complexing agent in sodium carbonate (Na2CO3) based alumina slurry for chemical mechanical planarization (CMP) of tantalum (Ta) and copper (Cu). Ta and Cu were polished using Na2CO3 (1 wt.%) with alumina (2 wt.%) in the presence and absence of urea. The effect of slurry pH, urea concentration, applied downward pressure and platen rotational speed were deliberated and the outcomes were conveyed. Prior to the addition of urea, Ta removal rate (RR) was observed to enhance with pH from acidic to alkaline having maximum RR at pH 11. However, Cu RR decreases with increasing pH with minimum RR at pH 11. With the addition of urea in the slurry, Cu to Ta removal rate selectivity of nearly 1:1 is encountered at pH 11. The addition of urea boosts the Ta RR and suppresses Cu RR at the same time at 11 pH, as it adsorbs on the metal surface. Potentiodynamic polarization was conducted to determine the corrosion current (Icorr) and the corrosion potential (Ecorr). The electrochemical impedance spectroscopy (EIS) of both the metals was carried out in the proposed formulation and the obtained outcomes were elaborated.

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Section: Introductionmentioning

confidence: 99%

Urea as a complexing agent for selective removal of Ta and Cu in sodium carbonate based alumina chemical–mechanical planarization slurry

Shukla

Selvam

Manivannan

2022

JSCS

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“…Natural polymers are a class of polymeric materials that have natural (animal, plant, and algal) origins, consisting primarily of glycosidic linkages [1][2][3][4][5][6]. Natural polymeric raw materials hold a special importance to both industry and our daily life [7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Over the last few decades, a wide variety of materials and synthesis approaches have been developed that allow molecular-level control over the design and structure of nanocomposite materials. Nanocomposites have been prepared by sol gel methods [1], by in situ polymerization routes, and by using simple compounding methods. All of these approaches share a common theme; the intermingling, on the nanometer scale, of dissimilar materials for the purpose of creating new materials with properties not available from either of the component pure materials.…”

Section: Introductionmentioning

confidence: 99%

“…All of these approaches share a common theme; the intermingling, on the nanometer scale, of dissimilar materials for the purpose of creating new materials with properties not available from either of the component pure materials. ver the past two decades, a lot of coordination polymers [1](nonporous CPs and porous CPs also called metal-organic frameworks, MOFs) have been synthesized based on a variety of organic ligands and they exhibit the fascinating functional properties and potential applications in the fields such as luminescence [2e5], magnetism [6,7], gas storage [8e10], sensor, catalysis, ion exchange [17e19], and so on. Besides the properties, the coordination polymers also show us the charming architectural aesthetics in the microscopic universe, such as the interpenetration, interlocking, selfcatenation, helix, metal-carboxylate chainbased structures (also called rod-packing structures), zeolitic imidazolate frameworks featuring four-connected tetrahedral topologies, pillared layered structures and so on.…”

Section: Introductionmentioning

confidence: 99%

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Natural Polymers in Tissue Engineering

Alenazi¹

2016

International Journal of Advanced Research in Computer and Comm

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Abstract:The application of freeze dried hydroxypropyl methylcellulose (HPMC) and methylcellulose (MC) as stabilizers in peanut butter were investigated. These cellulose derivatives were dispersed in water and subsequently freeze dried and chopped to produce a stabilizer that is able to absorb high amounts of oil. Without this templating approach, HPMC and MC had no effect on peanut butter stability and texture. An alternative spray drying approach was attempted. There are numerous techniques for microfabrication of patterned polymer surfaces and microchips for drug delivery. While silicon has been the choice material for much of the research done with MEMS, the methacrylates and acrylates provide a rapid and inexpensive base for future work. new method for determining Rigidity temperature applying cooling curve analysis. The determined values of Rigidity temperatures for three AlSi8Cu3 alloys with different contents of Strontium using thermal analysis technique have been compared with Rigidity temperatures obtained using mechanical technique (viscosity measurement).

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“…Gelatin is a hydrophilic natural biopolymer. It has been widely used in food, medicine and cosmetic applications as well as in biomaterials [15,16], and is the major structural protein in animal skin and bones.…”

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confidence: 99%

Electrospun gelatin/sodium bicarbonate and poly(lactide-co-ε-caprolactone)/sodium bicarbonate nanofibers as drug delivery systems

Sang

Williams

et al. 2017

Materials Science and Engineering: C

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In this work, we report electrospun nanofibers made of model hydrophobic (poly(lactide-co-ε-caprolactone); PLCL) and hydrophilic (gelatin) polymers. We explored the effect on drug release of the incorporation of sodium bicarbonate (SB) into these fibers, using the potent antibacterial agent ciprofloxacin as a model drug. The fibers prepared are smooth and have relatively uniform diameters lying between ca. 600 and 850nm. The presence of ciprofloxacin in the fibers was confirmed using IR spectroscopy. X-ray diffraction showed the drug to be incorporated into the fibers in the amorphous form. In vitro drug release studies revealed that, as expected, more rapid drug release was seen with gelatin fibers than those made of PLCL, and a greater final release percentage was obtained. The inclusion of SB in the gelatin fibers imparts them with pH sensitivity: gelatin/SB fibers showed faster release at pH5 than pH7.4, while fibers without SB gave the same release profiles at both pHs. The PLCL fibers have no pH sensitivity, even when SB was included, as a result of their hydrophobic structure precluding the ingress of solvent. In vitro cell culture studies showed that all the fibers are able to promote cell proliferation. The ciprofloxacin loaded fibers are effective in inhibiting Escherichia coli and Staphylococcus aureus growth in antibacterial tests. Thus, the gelatin-based fibers can be used as pH-responsive drug delivery systems, with potential applications for instance in the treatment of tumor resection sites. Should these become infected, the pH would drop, resulting in ciprofloxacin being released and the infection halted.

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Recently developed applications for natural hydrophilic polymers

Cited by 38 publications

References 240 publications

Urea as a complexing agent for selective removal of Ta and Cu in sodium carbonate based alumina chemical–mechanical planarization slurry

Urea as a complexing agent for selective removal of Ta and Cu in sodium carbonate based alumina chemical–mechanical planarization slurry

Natural Polymers in Tissue Engineering

Electrospun gelatin/sodium bicarbonate and poly(lactide-co-ε-caprolactone)/sodium bicarbonate nanofibers as drug delivery systems

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