Boron Ions Research Articles

Detailed Reaction Mechanism of Anthracene‐Bridged bis‐(3‐Pyridiniumboronic Acid) Chemosensor with D‐Glucose

AbstractDetailed reaction mechanisms of 4‐(N‐methyl)pyridinium boronic acid (1) and anthracene‐bridged bis(pyridinium boronic acid) compounds (diboronic acids 2 and 3) with D‐glucose were kinetically investigated in aqueous methanolic solutions. The crystal structure of diboronic acid 3 was determined using X‐ray crystallography. The pKa values of the two boronic acid moieties of diboronic acid (2 or 3) differed by one unit, indicating electronic interactions between the two boronic acid moieties. The kinetics of the reaction of boronic acid 1 with D‐glucose showed that both trigonal boronic acid and tetrahedral boronate ions were reactive with D‐glucose. UV‐Vis spectrophotometry and 1H NMR spectrometry of the reactions of phenylboronic acid with some model compounds of D‐glucose showed that the reactive moiety of α‐D‐glucofuranose towards phenylboronic acid was not the 1,2‐diol site, but the 3,5,6‐triol site. In the reactions of diboronic acids 2 and 3 with D‐glucose, the 3,5,6‐triol site of α‐D‐glucofuranose reacts first with one of the two equivalent boronic acid moieties of diboronic acid to form a 3,5‐bicoordinate intermediate as a rate‐determining step, followed by the reaction of the 1,2‐diol site of α‐D‐glucofuranose with another boronic acid moiety of diboronic acid to form the final 1,2 : 3,5‐tetracoordinate cyclic compound as a fast step.

Self‐consistent transport simulation of boron dust particle injection in the peripheral plasma in Large Helical Device

AbstractThe trajectories and the ablation positions of boron dust particles dropped from an impurity powder dropper in the peripheral plasma in the Large Helical Device (LHD) were calculated using a three‐dimensional edge plasma simulation code (EMC3‐EIRENE) and a dust transport simulation code (DUSTT). The simulation shows that the trajectory of the boron dust particles is deflected at the upper divertor leg due to the effect of the hydrogen plasma flow, and the ablation positions of the dust particles in an ergodic layer change toward the outboard side of the torus for higher plasma densities. The effect of the boron ion flow in the divertor leg on the deflection is investigated by coupling the two codes self‐consistently. The simulation predicts that the boron ions in the divertor leg, which are produced by sputtering on the divertor plates, which do not affect the change in the ablation positions. It also shows that the ablation positions move toward the inboard side and approach the Last Closed Flux Surface (LCFS) in case of increased boron dust drop rates, which is caused by the lowered plasma flow in the upper divertor leg due to the lowered electron temperature by radiation cooling by the dropped dust particles.

The Future of 2D Materials Production: Graphene and Borophene on larger scale

The production of graphene and borophene, two distinct materials with remarkable properties, is investigated through the manipulation of charged ions in a plasma environment. Plasma, characterized by ionized atoms or molecules, offers a unique setting where diverse chemical reactions can take place. This research focuses on utilizing this environment to create longer-chain graphene and carbon nanotubes by manipulating charged carbon ions. When positively and negatively charged carbon ions coexist within the plasma, they have the potential to interact and form bonds. This interaction results in the growth of extended carbon structures, particularly graphene. By carefully controlling plasma conditions such as temperature, pressure, and composition, scientists can guide the formation of longer-chain graphene and carbon nanotubes from these charged carbon ions. Similarly, the production of borophene, a material composed of boron atoms, also takes place in a plasma state. By introducing positively and negatively charged boron ions into the plasma, these ions interact and potentially form bonds, leading to the growth of extended borophene structures. This innovative approach unlocks the potential for tailored materials with enhanced property.

Synthesis and investigation of novel boron- and magnesium-doped YAG:Ce and LuAG:Ce phosphor ceramics.

YAG:Ce and LuAG:Ce ceramics are widely used as scintillator materials that convert high-energy radiation into visible light. For the practical application of such compounds, short decay times are a necessity. One way of shortening the existing decay times even more is to change the local environment of emitting ions by means of doping the matrix with additional elements, for example, boron or magnesium. Furthermore, boron ions also can help absorb gamma rays more efficiently, therefore improving overall applicability. Due to the aforementioned reasons, YAG and LuAG ceramics doped with cerium, boron, and magnesium were synthesized. Initial amorphous powders have been obtained by means of sol-gel synthesis and pressed into pellets under isostatic pressure and finally calcinated to form crystalline ceramics. The effects of boron and magnesium doping on the morphological, structural, and luminescence properties were investigated. The key results showed that doping with boron has indeed shortened the decay times of the garnet pellets. Overall, boron doping of ceramics is a relatively new research area; however, it is rather promising as it helps both to improve the luminescence properties and to increase particle growth rate.

Sustainable boron removal from aqueous solutions using pomegranate peel adsorbents: A comprehensive study on isotherms, kinetics, and thermodynamics

This study investigates the efficacy of pomegranate peel powders, specifically raw pomegranate peels (RPA), hydrochloric acid-modified (APA), and sodium hydroxide-modified (BPA) variants, as adsorbents for boron removal from aqueous solutions. Fourier-transform infrared (FTIR) analysis was employed to identify the functional groups involved in the adsorption process, while field emission scanning electron microscopy (FESEM) was utilized to examine the surface morphology of the adsorbents. Batch adsorption experiments optimized parameters such as pH, adsorbent dose, initial boron concentration, contact time, and temperature. The optimal pH for adsorption was 6, with maximum efficiencies of 42%, 69.3%, and 67.26% for RPA, APA, and BPA, respectively. Adsorption capacity increased with higher doses of adsorbents and temperature. The Langmuir model describes the adsorption isotherm well, while the adsorption kinetics were adequately described by the sequential fitting of the Elovich and pseudo-first-order models. Thermodynamic parameters (ΔS°, ΔG°, ΔH°) were examined during boron adsorption. A positive entropy change (∆S) indicated increased disorder. All adsorbents (RPA, APA, BPA) favoured boron, with APA and BPA showing a stronger affinity than RPA. Adsorption was endothermic and non-spontaneous, necessitating external energy. The study underscores the economical and reliable nature of RPA, APA, and BPA as effective adsorbents for repetitive boron ion removal, emphasizing their potential for sustainable water treatment solutions.

Dual Nucleosomal Double-Strand Breaks Are the Key Effectors of Curative Radiation Therapy

Most ionizing radiation produces δ-rays of ≈1 keV that can impart MGy doses to 100 nm3 volumes of DNA. These events can produce severe dual double-strand breaks (DDSBs) on nucleosomes, particularly in dense heterochromatic DNA. This is the most common multiply damaged site, and their probabilities determine the biological effectiveness of different types of radiation. We discuss their frequency, effect on cell survival, DNA repair, and imaging by gold nanoparticle tracers and electron microscopy. This new and valuable nanometer resolution information can be used for determining the optimal tumor cure by maximizing therapeutic effects on tumors and minimizing therapeutic effects on normal tissues. The production of DDSBs makes it important to deliver a rather high dose and LET to the tumor (>2.5 Gy/Fr) and at the same time reach approximately 1.8–2.3 Gy of the lowest possible LET per fraction in TP53 intact normal tissues at risk. Therefore, their intrinsic low-dose hyper-sensitivity (LDHS)-related optimal daily fractionation window is utilized. Before full p53 activation of NHEJ and HR repair at ≈½ Gy, the low-dose apoptosis (LDA) and LDHS minimize normal tissue mutation probabilities. Ion therapy should thus ideally produce the lowest possible LET in normal tissues to avoid elevated DDSBs. Helium to boron ions can achieve this with higher-LET Bragg peaks, producing increased tumor DDSB densities. Interestingly, the highest probability of complication-free cure with boron or heavier ions requires a low LET round-up for the last 10–15 GyE, thereby steepening the dose response and further minimizing normal tissue damage. In conclusion, the new high-resolution DSB and DDSB diagnostic methods, and the new more accurate DNA-repair-based radiation biology, have been combined to increase our understanding of what is clinically important in curative radiation therapy. In fact, we must understand that we already passed the region of optimal LET and need to go back one step rather than forward, with oxygen being contemplated. As seen by the high overkill and severely high LET in the distal tumor and the increased LET to normal tissues (reminding of neutrons or neon ions), it is therefore preferable to use lithium–boron ions or combine carbon with an optimal 10–15 GyE photon, electron, or perhaps even a proton round-up, thus allowing optimized, fractionated, curative, almost complication-free treatments with photons, electrons, and light ions, introducing a real paradigm shift in curative radiation therapy with a potential 5 GyE tumor boost, 25% increase in complication-free cure and apoptotic–senescent Bragg Peak molecular light ion radiation therapy.

Polymer-derived boron doped akermanite-octacalcium phosphate glass-ceramic scaffolds stimulate angiogenesis

Angiogenesis is crucial in bone tissue engineering due to expediting the healing rate and remarkably enhancing the regeneration process. Further, vascular sprouting progression is controlled by cellular autocrine and paracrine secretion of growth factors. Boron ions significantly stimulate cells in terms of excessive angiogenic growth factors secretion, therefore, could lead to excessive angiogenesis, contingent upon receiving an appropriate dose of the ion. In the current work, akermanite-octacalcium phosphate glass-ceramics were elicited from polymeric precursors, the method of synthesis that is so-called polymer-derived ceramics (PDC), and boron-containing moieties were employed to dope this element in the structure. Synthesized glass-ceramics were subjected to in vitro studies, including osteoconduction via monitoring the precipitation of hydroxycarbonate apatite (HCA), cytocompatibility, angiogenic growth factor secretion, and alkaline phosphatase (ALP) activity. The optimized sample was implanted in mice models and monitored in an in vivo study. The samples containing 6 wt% of B2O3 showed less bioactivity and cell viability. In contrast, 3 wt% of B2O3 led to more controlled biodegradation of octacalcium phosphate and through moderating the rate of release, the risk of boron overdosing was restrained.

Metal–Curcumin Complexes in Modern Pharmacotherapeutics: A Comprehensive Review

The major ingredient in turmeric, curcumin, has drawn a lot of interest as a plant-based substance having pharmacological benefits that are pleiotropic. It has immunomodulatory, neuroprotective, antibacterial, anti-inflammatory, antioxidant, hypoglycemic, and anti-inflammatory properties. Curcumin has certain health-promoting properties, but they are limited by its hydrophobicity, insolubility in water, low bioavailability, quick metabolism, and systemic elimination. Complexes of metals with curcumin have been created as a result of this unique step. The -diketone moiety of curcumin often interacts with metals to form metal-curcumin complexes. It is generally known that the metal ions of boron, cobalt, copper, gallium, gadolinium, gold, lanthanum, manganese, nickel, iron, palladium, platinum, ruthenium, silver, vanadium, and zinc are all highly chelated by curcumin. Metal-curcumin complexes’ pharmacological, chemo-preventive, and therapeutic properties are described in this paper. Metal-curcumin complexes boost the antioxidant, anti-inflammatory, antibacterial, and antiviral properties of curcumin by increasing its solubility, cellular absorption, and bioavailability. Additionally, metal-curcumin complexes have shown effectiveness against a number of chronic illnesses, such as cancer, rheumatoid arthritis, osteoporosis, and neurological conditions including Alzheimer’s disease. The regulation of inflammatory mediators, transcription factors, protein kinases, antiapoptotic proteins, lipid peroxidation, and antioxidant enzymes was linked to these biological activities of metal-curcumin complexes. Metal-curcumin complexes have also proven beneficial in radio-imaging and biological imaging. Future applications of metal-curcumin complexes might signal a fresh strategy for the management of chronic illnesses.

Sensitive detection of borax in real food samples by red emissive carbon nanoparticle displaying multiformat compatibility including faraway smartphone based sensing

Predictable chemical outcome is foremost important to obtain optical output in sensing mechanism that offer excellent leverage to the detection formats. This is demonstrated herein through the ultra-sensitive detection of Borax in real food samples using Carbon Nanoparticle (CNP). An instrument-free, inexpensive, sensitive, on-site, and visual detection is achieved by engaging the surface functional groups of CNP to trap the boronate ion of borax as a crosslinker to enforce an optical outcome in the form of Aggregation Induced Emission (AIE). Drastic amplification of the red fluorescence of CNP after borax addition is achieved within a minute with scope to extend the strategy to multiple formats including 96-well and microfluidic device irrespective of chemical interferences with LOD in micromolar range. The digital images of red emissive aggregated CNP served as input for colour recognition application of smartphones whereby Red-Green-Blue (RGB) channel values were extracted making the detection possible from faraway location.

Promoting reversibility of layered potassium cathode through interstitial doping

With the increasing needs for large-scale and low-cost energy storage devices, Mn-based layered oxide cathodes have achieved considerable researching interests for potassium-ion batteries owing to their high energy density, abundant resource and low toxicity. However, their developments are challenged by the absence of suitable cathode materials to tolerate large-sized K-ion insertion/extraction and the presence of Jahn-Teller distortion of Mn3+. To address this issue, we present a strategy of embedding boron into interstitial tetrahedral sites to obtain a P3-K0.5Mn0.8Co0.2B0.1O2 cathode. Strong B-O covalent bonds facilitate the construction of robust orthorhombic framework and alleviate the undesired elongation of Mn-O bonds, contributing to excellent electrochemical performance. In addition, boron ions are verified to promote the formation of a homogeneous cathode electrolyte interphase layer, improving interfacial stability and realizing highly reversible cycling in a wide voltage range (1.4–4.3 V). This strategy provides a new pathway towards the development of high-performance cathode materials for potassium-ion batteries.

Artificial intelligence approach to analyze SIMS profiles of11B,31P and75As in n- and p-type silicon substrates: experimental investigation

AbstractIn this work, we report an effective approach based on an artificial intelligence technique to investigate the secondary ions mass spectroscopy (SIMS) profiles of boron, phosphorus and arsenic ions. Those dopant ions were implanted into n- and p-type (100) Silicon substrate using the ion implantation technique with energy of 100 and 180 keV. Annealing treatment was conducted at various temperatures ranging from 900 to 1030 °C for 30 min. The doping profile parameters such as the activation energy, diffusion coefficient, junction depth, implant dose, projected range and standard deviation were determined using particle swarm optimization (PSO) algorithm. The efficiency of this strategy was experimentally verified by the fitting between both real measured SIMS profile and predicted ones. In addition, a set of simulated doping profiles was generated for different annealing time to prove the ability of this approach to accurately estimate the above parameters even when changing the experimental conditions.

Stabilizing the Deep Sodiation Process in Layered Sodium Manganese Cathodes by Anchoring Boron Ions.

Advanced high-energy-density sodium-ion batteries (SIBs) are inseparable from cathode materials with high specific capacities. Layered manganese-rich oxides (NaxMnO2, 0.6≤x≤1) are promising cathode materials owing to their ease of intercalation and extraction of a considerable amount of sodium ions. However, lattice interactions, especially electrostatic repulsive forces and anisotropic stresses, are usually caused by deep desodiatin/sodiation process, resulting in intragranular cracks and capacity degradation in SIBs. Here, boron ions are introduced into the layered structure to build up B─O─Mn bonds. The regulated electronic structure in Na0.637B0.038MnO2 (B-NMO) materials inhibits the deformation of MnO6 octahedra, which finally achieves a gentle structural transition during the deep sodiation process. B-NMO electrode exhibits a high capacity (141mAhg-1) at 1C with a capacity retention of 81% after 100 cycles. Therefore, anchoring boron to manganese-rich materials inhibits the detrimental structural evolution of deep sodiation and can be used to obtain excellent cathode materials for SIBs.

A promising modified polyvinyl chloride for adsorption of boron: Preparation, adsorption kinetics, isotherm, and thermodynamic studies

AbstractA new promising N‐methyl‐D‐glucamine modified polyvinyl chloride via methyl glycinate linker (PVC‐MG‐NMDG) was designed to extract boron from tourmaline ore from the Sikait area in the South Eastern Desert of Egypt, which assays 10.43% B2O3. Specifications for PVC‐MG‐NMDG composite were executed successfully utilizing sundry approaches, such as FT‐IR, XPS, GC–MS, TGA, BET, EDX, 13C‐NMR, 1H‐NMR, ICP‐OES, and XRD, which assure an acceptable synthesis of PVC‐MG‐NMDG. Optimized factors like pH, agitation time, primary boron concentration, composite dose, co‐ions, eluting agents, and temperature have been improved. At ambient temperature, pH 9, 10 min of agitation, and 0.0138 mol/L boron ions (150 ppm), the PVC‐MG‐NMDG composite has a 25 mg/g maximal uptake. The extraction‐distribution isotherm modeling suggests that the Langmuir model, with a theoretical value of 25.38 mg/g, more closely matches the practical value of 25 mg/g than the Freundlich model. The adsorption kinetics of boron ions by PVC‐MG‐NMDG were predicted with high accuracy using a pseudo‐second order kinetic model, yielding a theoretical retention capacity of 27.93 mg/g. The extraction process was predicted, as shown by thermodynamic calculations, exothermic, spontaneous, and optimal extraction at low temperature; the thermodynamic factors controlling ΔS (−0.04 kJ/mol), ΔH (−13.74 kJ/mol), and ∆G values rise from −1.82 kJ/mol at 298 K to −0.19 kJ/mol at 338 K. Boron ions can be eluted from the overloaded composite by 0.5 M H2SO4 with a 95% efficiency rate. It was established that PVC‐MG‐NMDG composite reveals a worthy separation factor to most co‐ions and gives a good separation power. Boric acid with a boron content of 17.23% and purity of 98.56% can be obtained through alkali fusion with NaOH flux and subsequent adsorption using a PVC‐MG‐NMDG composite.Highlights A New modified polyvinyl chloride (PVC‐MG‐NMDG) was successfully prepared. The characteristics of new composite were verified via different techniques. The new composite reached its maximum boron absorption of 25 mg/g at 25°C. The extraction as an exothermic, spontaneous process at low temperature. The new composite has been applied to a real sample of Sikait tourmaline ore.

Inorganic‐Rich Interphase Induced by Boric Oxide Solid Acid toward Long Cyclic Solid‐State Lithium‐Metal Batteries

AbstractSolid‐state electrolytes paired with lithium‐metal anodes is considered a next‐generation energy storage technology. However, the slow ionic transportation of the solid‐state electrolyte and the instability against the lithium‐metal anode impede their practical application. Here a cellulose separator modified with highly uniform boric oxide solid acid, contributing to a high transference number (0.75) and good ionic conductivity of 0.52 mS cm−1 due to the strengthened binding of the salt anions with this solid acid, is reported. Moreover, the boron ions with occupied interstitial sites can release free electrons to regulate the electrochemical dynamics of the electrolyte, in situ inducing the formation of Li2CO3/LiF‐rich heterostructured solid electrolyte interphase layer. The cellulose/B2O3‐based composite electrolyte paired with LiNi0.6Co0.2Mn0.2O2 (NCM622) cathode and Li‐metal anode displays a specific capacity of 155 mAh g−1 with a capacity retention of 92% in 200 cycles. Additionally, this electrolyte paired with high‐mass‐loading NCM622 cathode (10 mg cm−2) in a pouch cell can be stably operated for 50 cycles with a capacity retention of over 90%.

Simultaneous enrichment and sequential elution of cis-diol containing molecules and deoxyribonucleotides with bifunctional boronate and titanium (Ⅳ) ion modified-magnetic nanoparticles prior to quantitation by high performance liquid chromatography

Some diseases can cause abnormal concentrations of catecholamines (CAs), nucleosides (NSs) and nucleotides (NTs) in patients. Previous studies normally focused on the detection of the three types of substances separately. In this work, a bifunctional boronate and titanium (Ⅳ) ion affinity magnetic adsorbent with high-capacity was prepared. The adsorbent can simultaneously enrich CAs, NSs and NTs in a single extraction process, and the adsorbed analytes can be sequentially eluted by 1.0% trifluoroacetic acid and 20.0 mmol L−1 Na3PO4. An analytical method of the analytes has been established by coupling the adsorbent with RP-HPLC. The method has low detection limits (0.039–0.708 ng mL−1) and good reproducibility (inter- and intra-day of assay RSDs less than 15.0%). Serum sample from healthy volunteer was successfully quantified for two CAs, four NSs and five NTs. Compared with the reported methods, the proposed method is simpler to operate, consume less samples, and has enough accurate and sensitivity to obtain comprehensive information on the concentrations of analytes in a single extraction process.

Enhanced boron recovery by a new synthesized polyvinyl alcohol anchored gallic acid moiety via ethyl carbamate linker

ABSTRACT An innovative promising Gallic acid anchored poly vinyl alcohol via ethyl carbamate linker (PVA-EC-GA), was functionalized to extract boron from a tourmaline ore sample from Sikait area in South Eastern Desert of Egypt, which assaying 10.45% boron oxide. Specifications for PVA-EC-GA composite were accomplished by employing a variety of methods including XPS, FT-IR, EDX, BET, 1 H-NMR, TGA, 13C-NMR and GC-MS analyses, which assure an equitable prepare of PVA-EC-GA. Investigational measurements, namely: pH, agitation time, initial concentration of boron, composite dose, co-ions, temp. and agents of eluting, have been improved. At 25°C, pH 10, 20 min agitation and 0.0092 mol/L boron ions, PVA-EC-GA composite has an extreme uptake capacity of 43.75 mg per gram which is equivalent to 175 mg/L boron ions. From the isotherm modeling, Langmuir’s quite fitting the practical data. Conferring to kinetic modeling, pseudo-second order kinetic model well predicted the kinetics of boron ions adsorption by PVA-EC-GA giving a theoretical retention capacity of 43.86 mg/g. Thermodynamic prospects expose that the adsorption process was expected as an exothermic, spontaneous, and preferable adsorption at low temp. Boron ions can be eluted from the loaded composite, by 0.5 M H2SO4 with a 97% effectiveness

Comparative study on the second-harmonic generation of thermally poled fused silica by multi-energy boron and argon ion implantations

The second-order optical nonlinearity (SON) of thermally poled fused silica was shown for the first time to be significantly improved by the implantation of multi-energy boron (B) ions, and the outcomes were compared with those obtained from the implantation of multi-energy argon (Ar) ions. Second-harmonic (SH) signals in both samples grew roughly linearly as the poling temperature rose. Samples with Ar implants showed a greater increase in SH signal with rising poling temperature. A qualitative explanation for the formation of [Formula: see text] in poled samples can be found in a model of charge hopping and migration through defects. The diminished SH signal in the B-implanted sample is probably caused by the negative charge trapping layer, as well as by B[Formula: see text] and E[Formula: see text] center defects.

Boron and magnesium ions co-doping synergistically enhances the electrochemical performance of nickel-rich cathode materials

Nickel-rich ternary materials still suffer from defects of poor structure stability, fast capacity decay and poor rate performance, which inhibits their practical application in power batteries. Herein, a novel nickel-rich LiNi0.74Co0.14Mn0.12O2 cathode material co-doped with metallic and non-metallic ions was designed and prepared. The doped Mg2+ ions enter the lithium layers, reducing the Li+/Ni2+ cation mixing of the material; act as pillars, stabilizing the layered framework. While the doped B3+ ions occupy the tetrahedral sites, which expand the interlayer spacing and accelerate the diffusion of lithium ions. Furthermore, B3+ ions change the microstructure of the primary particles, alleviate the structural strain during the long cycle process and maintains the stability of the layered structure. Owing to the synergistic effect of Mg2+ and B3+ doping, the co-doped material exhibits superior electrochemical performance. A discharge capacity of 127.6 mAh·g−1 at 10 C, as well as a capacity retention of 91.33% after 100 cycles at 1C rate was achieved in the co-doped material. This metallic and non-metallic ion co-doping ternary material demonstrates its superiority compared with the single-element modified material.

Optimization of Activation Annealing Condition for Boron‐Implanted Diamond

Impurity activation of dopants implanted in diamond is one of the crucial issues for device application of diamond. Boron impurity atoms are introduced in diamond, which expectedly act as acceptors, by ion implantation technique, and are investigated the optimum annealing time for the effective dopant activation. The impurity doping is performed by boron ion implantation at multiple incident energies to obtain a uniform dopant concentration from the surface to 350 nm depth followed by activation annealing at 1300 °C for 5–240 min. The electrical properties of specific resistance, carrier concentration, and conduction type are analyzed as a function of temperature from room temperature to 873 K. The estimated ionization energy is strongly dependent on the annealing time and asymptotically approaches to 0.3 eV, which is theoretically expected ionization energy of acceptor boron, with increasing annealing time. A shorter annealing time ( does not sufficiently recover radiation damages caused by ion implantation forming deep levels, which act as irregular conduction. It is consequently found that an optimum window of annealing time for effective dopant activation and suggested carrier transport mechanisms depending on the annealing time.

Investigation of Corrosion Properties and Composition of the Surface Formed on AISI 321 Stainless Steel by Ion Implantation

In this work, the corrosion resistance of AISI 321 stainless steel is increased through. the two-stage implantation of oxygen ions and of both aluminum and boron ions together. During ion implantation, a modified layer with a thickness of about 200 nm is formed, which affects the properties of material. The increase in corrosion resistance is confirmed by prolonged acid corrosion tests at pH 3.5 and by accelerated electrochemical tests using a potentiostat. The corrosion rate of the implanted sample is 0.708 μA/cm2, in contrast to the non-implanted sample (1.26 μA/cm2). The modified surface layer is examined using X-ray photoelectron spectroscopy (XPS), secondary-ion mass spectrometry (SIMS), and transmission electron microscopy (TEM). Aluminum and boron are implanted to a depth of more than 250 nm. It is found that the modified surface of the stainless steel substrate contains oxides of implanted ions (Al2O3) and oxides of substrate ions (Cr2O3 and NiCr2O4).