Rare Earth elements (REEs) are known as the “vitamins of chemistry” have widely used in industries including aerospace, marine and electronics. Metals and ceramics are examples of existing durable materials that are typically hydrophilic and need to be modified with other materials to become hydrophobic. This research paper investigates the hydrophobic potential of the family of ceramics known as rare-earths, which belong to the lanthanide series. The distinct electronic structure of rare earths atoms hinders hydrogen bonding when water molecules come in contact with the composites. This results in a hydrophobic hydration structure, wherein the surface oxygen atoms serve as the only hydrogen bonding sites. Moisture can speed up the corrosion process, particularly when combined with oxygen and other impurities. Water has the ability to help electrolytes develop that accelerates aluminum corrosion. Aluminum corrodes more quickly at higher temperatures. Owing to their distinct physicochemical characteristics, rare earth metals have attracted a lot of attention to improve the performance of composites. When Rare Earth Oxides (REOs) are added to composite materials, their hydrophobicity is greatly increased. This is because passive films are formed and the microstructure is altered, which increases the materials’ resistance to corrosion. Apart from these fundamentals of hydrophobicity, corrosion behaviour and challenges are also discussed in this paper.
WangZXiaYSongL, et al.Fabrication of bulk tungsten microstructure arrays for hydrophobic metallic surfaces using inductively coupled plasma deep etching. Micromachines (Basel)2024; 15: 807.
2.
AhmadNALeoCPAhmadAL,et al.Membranes with great hydrophobicity: a review on preparation and characterization. Separat Purifica Rev2015; 44: 109–134.
3.
InamdarAIPathakAUsmanM, et al.Highly hydrophobic metal–organic framework for self-protecting gate dielectrics. J Mater Chem A2020; 8: 11958–11965.
4.
PenalozaDPJr. One-pot preparation of PS/silica hydrophobic coating by solution-casting using D-limonene as dispersing medium. 2019.
5.
SharmaVKKumarVJoshiRS. Parametric study of aluminium-rare earth based composites with improved hydrophobicity using response surface method. J Mater Res Technol2020; 9: 4919–4932.
6.
LiuJJanjuaZARoeM, et al.Super-hydrophobic/icephobic coatings based on silica nanoparticles modified by self-assembled monolayers. Nanomaterials2016; 6: 232.
7.
WangYYuYHuX, et al.p-Phenylenediamine strengthened graphene oxide for the fabrication of superhydrophobic surface. Mater Des2017; 127: 22–29.
8.
DingSXiangTLiC, et al.Fabrication of self-cleaning super-hydrophobic nickel/graphene hybrid film with improved corrosion resistance on mild steel. Mater Des2017; 117: 280–288.
9.
SharmaVKKumarVJoshiRS,et al.Effect of REOs on tribological behavior of aluminum hybrid composites using ANN. In: Additive manufacturing in industry 4.0. Taylor & Francis Group: CRC Press, 2022, pp.153–167.
10.
MullangiDShaliniSNandiS, et al.Super-hydrophobic covalent organic frameworks for chemical resistant coatings and hydrophobic paper and textile composites. J Mater Chem A2017; 5: 8376–8384.
11.
SharmaVKKumarVJoshiRS,et al.Experimental analysis and characterization of SiC and RE oxides reinforced Al-6063 alloy based hybrid composites. Int J Adv Manuf Technol2020; 108: 1173–1187.
12.
Framil CarpeñoDDickinsonMSealC,et al.Induced hydrophobicity in micro-and nanostructured nickel thin films obtained by ultraviolet pulsed laser treatment. Phys Status Solidi (a)2016; 213: 2709–2713.
13.
ChangJWangZHanEH, et al.Corrosion resistance of tannic acid, d-limonene and nano-ZrO2 modified epoxy coatings in acid corrosion environments. J Mater Sci Technol2021; 65: 137–150.
14.
SrikantSVKKumarVJoshiRS, et al.A review of recent research on rare earth particulate composite materials and structures with their applications. Trans Indian Inst Met2021; 74: 1–13. https://doi.org/10.1007/s12666-021-02338-y
15.
FihriABoveroEAl-ShahraniA, et al.Recent progress in superhydrophobic coatings used for steel protection: a review. Colloids Surf, A2017; 520: 378–390.
16.
SharmaVKKumarVJoshiRS. Experimental investigation on effect of RE oxides addition on tribological and mechanical properties of Al-6063 based hybrid composites. Mater Res Express2019; 6: 0865d7.
17.
KumarSRSharmaHOKumarS,et al.Polymeric bio-nanocomposite in the biomedical field: a review of the current status and challenges. Int J Nano Biomater2024; 10: 160–170.
18.
KumarSRSharmaHOKumarS,et al.Investigation of physical, chemical and mechanical behaviour of nano-ZrO2-based dental composite. Proce Inst Mech Eng, Part E: J Proces Mech Eng2023; 09544089231190223. https://doi.org/10.1177/09544089231190223
19.
VenuHHossainISoudagarMEM, et al.Investigations on thermal properties of Kevlar K49 type fiber reinforced sugarcane ash blended polyester composite. Therm Sci Eng Progr2024; 55: 102880.
20.
PatelDKSharmaVKSharmaHO. Advancements in Aluminum Matrix Composites: A Comprehensive Review on the Mechanical and Microstructural Attributes of Rare Earth Elements (REEs) and Rare Earth Oxides (REOs) Doped Materials. Transactions of the Indian Institute of Metals. 2024, pp.1–12.
21.
OhJOrejonDParkW, et al.The apparent surface free energy of rare earth oxides is governed by hydrocarbon adsorption. Iscience2022; 25. doi:https://doi.org/10.1016/j.isci.2021.103691.
22.
SharmaVKKumarVJoshiRS. Investigation of rare earth particulate on tribological and mechanical properties of Al-6061 alloy composites for aerospace application. J Mater Res Technol2019; 8: 3504–3516.
23.
OhIKKimKLeeZ, et al.Hydrophobicity of rare earth oxides grown by atomic layer deposition. Chem Mater2015; 27: 148–156.
24.
SharmaVKKumarPAkhaiS, et al.Analyzing the tribological and mechanical performance of Al-6061 with rare earth oxides: An experimental analysis. Proce Inst Mech Eng, Part E: J Proces Mech Eng2023; 09544089231160003.238.
25.
SharmaVKAggarwalDVinodK,et al.Influence of rare earth particulate on the mechanical & tribological properties of Al-6063/SiC hybrid composites. Part Sci Technol2021; 39: 928–943.
26.
GuoZLiuWSuBL. Superhydrophobic surfaces: from natural to biomimetic to functional. J Colloid Interface Sci2011; 353: 335–355.
27.
JohnsonREJrDettreRH. Contact angle hysteresis. III. Study of an idealized heterogeneous surface. J Phys Chem1964; 68: 1744–1750.
28.
GoodRJ. Contact angle, wetting, and adhesion: a critical review. J Adhes Sci Technol1992; 6: 1269–1302.
29.
SharmaVKKumarPAkhaiS, et al.Corrosion inhibition analysis on cerium induced hydrophobic surface of Al-6061/SiC/Al2O3 hybrid composites. Proce Inst Mech Eng, Part B: J Eng Manuf2024; 09544054231222048.238.
30.
SharmaVKKumarV. Development of rare-earth oxides based hybrid AMCs reinforced with SiC/Al2O3: mechanical & metallurgical characterization. J Mater Res Technol2019; 8: 1971–1981.
31.
YanYYGaoNBarthlottW. Mimicking natural superhydrophobic surfaces and grasping the wetting process: a review on recent progress in preparing superhydrophobic surfaces. Adv Colloid Interface Sci2011; 169: 80–105.
32.
da SilvaRGVieiraMRMaltaMI, et al.Effect of initial surface treatment on obtaining a superhydrophobic surface on 5052 aluminum alloy with enhanced anticorrosion properties. Surf Coat Technol2019; 369: 311–322.
33.
RagutkinAVDasaevMRKalakutskayaOV, et al.Creation of hydrophobic functional surfaces of structural materials on the basis of Laser ablation (overview). Therm Eng2022; 69: 429–449.
34.
YeadonKLaiEPHuangX,et al.Influence of surface roughness and metal oxide nanoparticles on airframe with icephobic coatings. RSC Appl Interf2024; 2.
35.
RasRHMarmurA (eds.). Non-wettable surfaces: theory, preparation and applications. Royal Society of Chemistry, 2016.
36.
MaCNikiforovAHegemannD, et al.Plasma-controlled surface wettability: recent advances and future applications. Int Mater Rev2023; 68: 82–119.
37.
JafariRAsadollahiSFarzanehM. Applications of plasma technology in development of superhydrophobic surfaces. Plasma Chem Plasma Process2013; 33: 177–200.
38.
HaoJHWangZJ. Modeling cassie–baxter state on superhydrophobic surfaces. J Dispersion Sci Technol2016; 37: 1208–1213.
39.
BormashenkoEChanielGILADMultanenVICTOR. Probing properties of cold radiofrequency plasma with polymer probe. J Plasma Phys2015; 81: 905810105.
40.
ZhangXZhangXZhengH, et al.Yttrium separation by phosphorylcarboxylic acid and the underlying tetrad effect along lanthanide unveiled from different microscopic interactions. Elsevier: Fundamental Research, 2023.
41.
OhIKSandovalTELiuTL, et al.Elucidating the reaction mechanism of atomic layer deposition of Al2O3 with a series of Al(CH3)xCl3–x and Al (CyH2y+1)3 precursors. J Am Chem Soc2022; 144: 11757–11766.
42.
KujawaJAl-GharabliSWrzeszczG, et al.Physicochemical and magnetic properties of functionalized lanthanide oxides with enhanced hydrophobicity. Appl Surf Sci2021; 542: 148563.
43.
AzimiGDhimanRKwonHM, et al.Hydrophobicity of rare-earth oxide ceramics. Nat Mater2013; 12: 315–320.
44.
ZemłaMRSpiewakPWejrzanowskiT,et al.Hydrophobic properties of Al2O3 doped with rare-earth metals: ab initio modeling studies. Phys Status Solidi (a)2018; 215: 1700895.
45.
YangEYangRWeiW, et al.Corrosion resistance and antibacterial properties of hydrophobic modified Ce-doped micro-arc oxidation coating. J Mater Res Technol2024; 29: 3303–3316.
46.
SankarSNairBNSuzukiT, et al.Hydrophobic and metallophobic surfaces: highly stable non-wetting inorganic surfaces based on lanthanum phosphate nanorods. Sci Rep2016; 6: 22732.
47.
GiovambattistaNDebenedettiPGRosskyPJ. Effect of surface polarity on water contact angle and interfacial hydration structure. J Phys Chem B2007; 111: 9581–9587.
48.
MamedovDAslandACCooilSP, et al.Enhanced hydrophobicity of CeO2 thin films: role of the morphology, adsorbed species and crystallography. Mater Today Commun2023; 35: 106323.
49.
SoudagarMEMUpadhyayVVBhooshanamNN, et al.Organic municipal solid waste derived hydrogen production through supercritical water gasification process configured with K2CO3/SiO2: performance study. Biomass Bioenergy2024; 190: 107379.
50.
ShiZZhouZShumP,et al.Thermal stability, wettability and corrosion resistance of sputtered ceria films on 316 stainless steel. Appl Surf Sci2019; 477: 166–171.
51.
SharmaVKKumarVJoshiRS. Effect of RE addition on wear behavior of an Al-6061 based hybrid composite. Wear2019; 426: 961–974.
52.
PrakashSGhoshSPatraA, et al.Intrinsic hydrophilic nature of epitaxial thin-film of rare-earth oxide grown by pulsed laser deposition. Nanoscale2018; 10: 3356–3361.
53.
KhanSAzimiGYildizB,et al.Role of surface oxygen-to-metal ratio on the wettability of rare-earth oxides. Appl Phys Lett2015; 106.
54.
KulahEMarotLSteinerR, et al.Surface chemistry of rare-earth oxide surfaces at ambient conditions: reactions with water and hydrocarbons. Sci Rep2017; 7: 43369.
ErbRA. Wettability of metals under continuous condensing conditions. J Phys Chem1965; 69: 1306–1309.
59.
LiCXinQ. FT-IR spectroscopic investigation of methane adsorption on cerium oxide. J Phys Chem1992; 96: 7714–7718.
60.
PengCWuRYangY, et al.Hydrothermal formation of controllable hexagonal holes and Er2O3/Er2O3-RGO particles on silicon wafers toward superhydrophobic surfaces. J Colloid Interface Sci2020; 580: 768–775.
61.
LiLPanSLiY, et al.Mutually Duplicated Templates and Their Versatile Applications. Adv Mater Interfaces2016; 3.
62.
BormashenkoE. General equation describing wetting of rough surfaces. J Colloid Interface Sci2011; 360: 317–319.
63.
LeiJHuLZhangJ, et al.Theoretical and experimental approaches to construct highly-durable Sm2O3-containing superhydrophobic surfaces of aluminum alloys. Appl Surf Sci2020; 499: 143931.
64.
SchemMSchmidtTGerwannJ, et al.CeO2-filled sol–gel coatings for corrosion protection of AA2024-T3 aluminium alloy. Corros Sci2009; 51: 2304–2315.
65.
SharmaVKKumarVJoshiRS. Manufacturing of stable hydrophobic surface on rare-earth oxides aluminium hybrid composite. Proce Inst Mech Eng, Part E: J Proces Mech Eng2021; 235: 899–912.
66.
McHaleGLedesma-AguilarRNetoC. Cassie’s law reformulated: composite surfaces from super spreading to superhydrophobic. Langmuir2023; 39: 11028–11035.
67.
LiuJWangQ. Role of surface texture in the hydrophobicity of functional materials. Surf Coat Technol2018; 348: 100–108.
68.
LvJChengY. Fluoropolymers in biomedical applications: state-of-the-art and future perspectives. Chem Soc Rev2021; 50: 5435–5467.
69.
XuPMengGPershinL, et al.Control of the hydrophobicity of rare earth oxide coatings deposited by solution precursor plasma spray by hydrocarbon adsorption. J Mater Sci Technol2021; 62: 107–118.
70.
MakarovASokolovAIvanovA. Influence of surface wettability on the corrosion resistance of metal matrix composites in saline solutions. J Mater Sci2020; 55: 6055–6069.
71.
FitzgibbonGCEJ JRHUBERCE JRHOLLEY. The enthalpies of formation of PR2O3 (Hexagonal), PR2O3 (cubic), and PRO1. 833. 1973.
72.
NavrotskyALeeWMielewczyk-GrynA, et al.Thermodynamics of solid phases containing rare earth oxides. J Chem Thermodyn2015; 88: 126–141.
73.
TamJFengBIkuharaY, et al.Crystallographic orientation–surface energy–wetting property relationships of rare earth oxides. J Mater Chem A2018; 6: 18384–18388.
74.
ChambersBDTaylorSR. The high throughput assessment of aluminium alloy corrosion using fluorometric methods. Part II–A combinatorial study of corrosion inhibitors and synergistic combinations. Corros Sci2007; 49: 1597–1609.
75.
ChenGSGaoMWeiRP. Microconstituent-induced pitting corrosion in aluminum alloy 2024-T3. Corrosion1996; 52.
76.
DavoBDe DamboreneaJJ. Use of rare earth salts as electrochemical corrosion inhibitors for an Al–Li–Cu (8090) alloy in 3.56% NaCl. Electrochim Acta2004; 49: 4957–4965.
77.
JiaDShiWLiK, et al.Effects of rare earth oxides on wear resistance and corrosion resistance of 316L/TiC composite coating by laser cladding. Mater Today Commun2024; 39: 109001.
78.
KozhukharovSKozhukharovVSchemM, et al.Protective ability of hybrid nano-composite coatings with cerium sulphate as inhibitor against corrosion of AA2024 aluminium alloy. Prog Org Coat2012; 73: 95–103.
79.
ZhangXWangZZhouZ,et al.Effects of cerium and lanthanum on the corrosion behavior of Al-3.0 wt.% Mg alloy. J Mater Eng Perform2016; 25: 1122–1128.
80.
BayrakYKısasözBÖTarakçıG,et al.Characterization of Al/B4C–Y2O3 hybrid composites produced by vacuum hot pressing combined with Al2O3–Y2O3 interaction. Ceram Int2024. doi:https://doi.org/10.1016/j.ceramint.2024.07.007.
81.
Valerio-RodríguezMFGonzálezLAMata-PadillaJM,et al.Composite coatings from polycarbosilane derived SiC and Al/SiC cermet active fillers as protective barriers against steel corrosion. Silicon2024; 16: 1–13.
82.
ZhangSLiuJTangM, et al.Role of rare earth elements on the improvement of corrosion resistance of micro-alloyed steels in 3.5 wt.% NaCl solution. J Mater Res Technol2021; 11: 519–534.
83.
ChenJYangHXuG, et al.Rare earth passivation and corrosion resistance of zinc coated NdFeB magnets. J Rare Earths2022; 40: 302–308.
84.
DelimiAFerkousHAlamM, et al.Corrosion protection performance of silicon-based coatings on carbon steel in NaCl solution: a theoretical and experimental assessment of the effect of plasma-enhanced chemical vapor deposition pretreatment. RSC Adv2022; 12: 15601–15612.
85.
SoudagarMEMShelareSMarghadeD, et al.Optimizing IC engine efficiency: a comprehensive review on biodiesel, nanofluid, and the role of artificial intelligence and machine learning. Energy Convers Manage2024; 307: 118337.
86.
SoudagarMEMKiongTSJatharL, et al.Perspectives on cultivation and harvesting technologies of microalgae, towards environmental sustainability and life cycle analysis. Chemosphere2024; 353: 141540.
87.
PatelDKSharmaVKSharmaHO. Current global Status of rare earth elements (REEs) and their role as catalysts in reducing air pollution for maintaining environmental sustainability. Trans Indian Inst Met2025; 78: 4.
88.
XuPCoyleTWPershinL,et al.Fabrication of micro-/nano-structured superhydrophobic ceramic coating with reversible wettability via a novel solution precursor vacuum plasma spray process. Mater Des2018; 160: 974–984.
89.
SharmaSSSharmaKSahuJ, et al.Role of rare-earth oxides, conjugated with TiO2, in the enhancement of power conversion efficiency of dye sensitized solar cells (DSSCs). Environ Sci Pollut Res2023; 30: 98760–98772.
90.
FilhoWLKotterRÖzuyarPG, et al.Understanding rare earth elements as critical raw materials. Sustainability2023; 15: 1919.
91.
CollocottSJDunlopJBGwanPB, et al.Applications of rare-earth permanent magnets in electrical machines: from motors for niche applications to hybrid electric vehicles. In: China Magnet Symposium, Xi‟ an, China. 2004, May.
92.
DuchnaMCieslikI. Rare Earth Elements in New Advanced Engineering Applications. In: Rare Earth Elements-Emerging Advances, Technology Utilization, and Resource Procurement. Intech Open, 2022.
93.
WangJLiS. Applications of rare earth elements in cancer: evidence mapping and scientometric analysis. Front Med (Lausanne)2022; 9: 946100.
94.
SoudagarMEMBashirMNVijayanDS, et al.Study of antimicrobial and mechanical behaviors on kapok fiber reinforced bran particulates blended epoxy matrix composite. Thermal Sci Eng Progr2024; 103123.
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