物理最新文献

{"title":"The nonleptonic decays (Xi _{cc}^{++}rightarrow Xi _{c}^{(prime )+}pi ^{+}) within the nonrelativistic quark model","authors":"Yu-Shuai Li","doi":"10.1140/epjc/s10052-025-14670-4","DOIUrl":"10.1140/epjc/s10052-025-14670-4","url":null,"abstract":"<div><p>In this work, we study the nonleptonic decays <span>(Xi _{cc}^{++}rightarrow Xi _{c}^{(prime )+}pi ^{+})</span> with considering <span>(Xi _{c}-Xi _{c}^{prime })</span> mixing. The relevant decay amplitudes are evaluated within the framework of nonrelativistic quark model, combining the baryon spatial wave functions adopted from solving the Schrödinger equation with a nonrelativistic potential. With the mixing angle ranging <span>(theta in (-18.2^{circ },-14.3^{circ }),)</span> we successfully reproduce the measured ratio <span>(R={mathcal {B}}[Xi _{cc}^{++}rightarrow Xi _{c}^{prime +}pi ^{+}]/{mathcal {B}}[Xi _{cc}^{++}rightarrow Xi _{c}^{+}pi ^{+}])</span> reported by the LHCb Collaboration. Furthermore, we estimate the branching fractions as <span>({mathcal {B}}[Xi _{cc}^{++}rightarrow Xi _{c}^{+}pi ^{+}]=(3.2sim 4.3)%)</span> and <span>({mathcal {B}}[Xi _{cc}^{++}rightarrow Xi _{c}^{prime +}pi ^{+}]=(4.2sim 6.0)%,)</span> and the asymmetry parameters as <span>(alpha [Xi _{cc}^{++}rightarrow Xi _{c}^{+}pi ^{+}]=(-0.80sim -0.81))</span> and <span>(alpha [Xi _{cc}^{++}rightarrow Xi _{c}^{prime +}pi ^{+}]=(-0.61sim -0.62).)</span> The measurements of absolute branching fractions and asymmetry parameters by the ongoing LHCb and Belle II experiments will be helpful for further testing our numerical results and confirming the mixing angle.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 9","pages":""},"PeriodicalIF":4.8,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14670-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144929324","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Real-time detection of residual HD contamination levels after decontamination with selected decontamination agents","authors":"Dieter Rothbacher","doi":"10.1140/epjp/s13360-025-06773-4","DOIUrl":"10.1140/epjp/s13360-025-06773-4","url":null,"abstract":"<div><p>NATO doctrine considers clearance decontamination to be applicable after the termination of a CBRN incident and largely deems the conduct of clearance decontamination to be a civilian—not a military—capability (NATO STANREC 4784 CBRN Clearance decontamination, Study draft 1, 2015).</p><p>Clearance decontamination procedures are such that the process is verified as being achieved by determining the residual contamination levels on every part of various surfaces of equipment and infrastructure and by demonstrating that such levels are below the ones that are predetermined by the relevant civilian authorities, who are responsible for the safety of the civilian population (NATO STANREC 4784 CBRN, 2015). The current desirable surface contamination detection levels for some chemical warfare agents are technically challenging and may be beyond the capabilities of current technologies of military and civilian CBRN response. Experimental research with this PTR-ToF-MS (proton transfer reaction time-of-flight mass spectrometry) technology, using chemical warfare agents as contaminants, showed that this technology is an invaluable asset in supporting civilian authorities when determining safe levels of surface contamination in real time, after the completion of decontamination operations.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144934778","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantum entanglement of two bosonic modes in de Sitter space","authors":"Madalin Calamanciuc,&nbsp;Aurelian Isar","doi":"10.1140/epjp/s13360-025-06768-1","DOIUrl":"10.1140/epjp/s13360-025-06768-1","url":null,"abstract":"<div><p>The time evolution of Gaussian quantum entanglement of two bosonic modes associated with a scalar quantum field in de Sitter space and in interaction with a thermal reservoir is investigated in the framework of the theory of open systems based on completely positive quantum dynamical semigroups. We show that quantum entanglement strongly depends on the squeezing of the bimodal state, the parameters characterizing the thermal environment, the curvature parameter of de Sitter space, and the mass parameter. The thermal environment and the curvature have a destructive influence on the entanglement, whose survival time depends on the competition between the contrary effects provided by the squeezing of the bimodal state, the curvature, and the thermal bath. The entanglement is minimized for values 1/2 and 3/2 of the mass parameter, corresponding to the conformally coupled scalar field, respectively, minimally coupled massless field.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjp/s13360-025-06768-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144934776","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quasinormal modes and shadows of black holes in infinite derivative theory of gravity","authors":"Rupam Jyoti Borah,&nbsp;Umananda Dev Goswami","doi":"10.1140/epjc/s10052-025-14674-0","DOIUrl":"10.1140/epjc/s10052-025-14674-0","url":null,"abstract":"<div><p>In this work, we studied the quasinormal modes (QNM) and shadow of a Schwarzschild Black hole (BH) with higher-order metric corrections, in the framework of Infinite Derivative theory of Gravity (IDG). We studied the effects on QNMs and shadow of the BH, which arises from the IDG’s corrections to the BH’s metric. We used 6th order Padé averaged WKB approximation method to study the QNMs of the BH perturbed by a scalar field. We analyze the dependence of the amplitude and damping of QNMs with respect to the free parameters. Next, we studied the time evolution of a scalar field around the BH spacetime. The QNMs have been calculated from the time profile of the evolution. Then we studied the shadow of the BH. The variation of the shadow radius due to inclusion of higher-order corrections was studied and the variation of the shadow radius with respect to the free parameters also studied. Furthermore, the dependence of the shadow radius on the mass of the BH is also studied. Finally, we constrained the free parameters associated with the correction terms using the data from the Keck and VLTI observation, and we obtained some bounds on the parameters.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 9","pages":""},"PeriodicalIF":4.8,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14674-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144934613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Biosynthesis and characterization of copper chromite nanocomposites from Mangifera indica pulp extract for antimicrobial and photocatalytic applications","authors":"Azam Raza,&nbsp;Mohd Subhan,&nbsp;Gulrana Khuwaja,&nbsp;Hafiz A. Makeen,&nbsp;Irfan Ahmad,&nbsp;Abdullah Ali Alamri,&nbsp;Faris Alfifi,&nbsp;Kahkashan Anjum,&nbsp;Khatib Sayeed Ismail,&nbsp;Asaduddin Mohammed,&nbsp;Syed Kashif Ali,&nbsp;Mohd Imran,&nbsp;Absar Ahmad","doi":"10.1140/epjp/s13360-025-06727-w","DOIUrl":"10.1140/epjp/s13360-025-06727-w","url":null,"abstract":"<div><p>The eco-friendly production of nanoparticles from plant extracts has garnered considerable interest for their dual function as stabilizing and reducing agents. This work biogenically generated copper chromite (CuCr₂O₄) nanocomposites utilizing <i>Mangifera indica</i> (mango) pulp extract, highlighting their potential in antibacterial and photocatalytic applications. The synthesized CuCr₂O₄ nanocomposites displayed agglomerated grains with an average particle size of 47.5 nm, as verified by TEM imaging, and a BET surface area of 7.948 m²/g. FTIR spectroscopy confirmed the establishment of Cu–O and Cr–O bonds, while UV–vis spectroscopy assessed an indirect bandgap of 2.99 eV, enhancing the material’s photocatalytic efficacy. Antimicrobial experiments demonstrated potent antifungal and anti-nematic properties, substantially suppressing <i>Sclerotinia\u0000sclerotiorum</i> and <i>Meloidogyne incognita</i> at doses ranging from 100 to 300 ppm. Moreover, the photocatalytic breakdown of methylene blue under solar irradiation exhibited a 90% efficiency after 90 min, underscoring the nanocomposite’s efficacy in organic dye elimination. These results highlight the adaptability of CuCr₂O₄ nanocomposites as eco-friendly substitutes for agricultural pest management and wastewater treatment, reducing dependence on toxic chemicals while facilitating environmental restoration.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144934777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessment of natural radioactivity and radiological risks in soil from scrap metal dumpsites in Plateau State, North-Central Nigeria","authors":"Akila Simdet,&nbsp;M. A. Abdullazeez,&nbsp;Ibrahim Maina,&nbsp;O. W. Olasoji,&nbsp;Shams A. M. Issa,&nbsp;U. Rilwan,&nbsp;Yohanna Emmanuel,&nbsp;M. I. Sayyed","doi":"10.1140/epjp/s13360-025-06766-3","DOIUrl":"10.1140/epjp/s13360-025-06766-3","url":null,"abstract":"<div><p>A total of seventeen soil samples were taken at point source of the scrap metal dumpsites in Plateau State, located in the North-Central region of Nigeria. To determining the natural radioactivity, the samples were examined using a NaI (Tl) detector. 85.04, 66.64, and 277.84 Bq/kg are the average activity concentration of ²²⁶Ra, ²³²Th, and ⁴⁰ K. Ra_eq (201.72 Bq/kg), H_ex (0.54), H_in (0.77), ER (399.22 μR/h), DR (33.26 mSv/y), and D_air (92.26 nGy/h) were the parameters that were used in the calculation of the radiological assessments. Not only were the average values of ²²⁶Ra and ²³²Th, greater than the average values of the globe, but they were also higher than the average values of the D_air and AEDE_in. In terms of radioactive dangers, the average values of radium equivalent activity and the indices were both lower than the levels that are considered acceptable on an international scale. This investigation may provide initial information for future monitoring of soil radioactivity and its findings could be used as an indicator for further radiological evaluations.</p></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144929317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Point defect improved linear and elliptical photogalvanic effects in a BSi3 photo-detector","authors":"Hui Zeng,&nbsp;Xi Fu,&nbsp;Guangyao Liang,&nbsp;Jian Lin,&nbsp;Wenhu Liao,&nbsp;Liming Li","doi":"10.1140/epjp/s13360-025-06770-7","DOIUrl":"10.1140/epjp/s13360-025-06770-7","url":null,"abstract":"<div><p>This paper examines the linear and elliptical photogalvanic effects in a BSi₃ photo-detector with the BSi₃ monolayer being a silicene-like and metallic two-dimensional material, and investigates the influence of point defect in the BSi₃ photo-detector and its potential applications in optoelectronic devices. Computational simulations were employed to investigate the photo-currents produced by the photogalvanic effect under various spatial structures and symmetry conditions. The results demonstrated that due to the decreasing in symmetry, typical point defects, namely vacancy and substitution doping, can produce significantly high photo-currents with the largest value as 26.6 <span>(a_{0}^{2})</span>/photon which is enough to be experimentally detected, then robust linear and elliptical photogalvanic effects were improved by different vacancy and substitution doping cases, respectively. In addition, at different point defect situations the BSi₃ photo-detector exhibited exceptional sensitivity on polarization detection which highlighted the potentials of metallic BSi₃ monolayer in polarization-sensitive photo-detectors. Therefore, by elucidating the interrelationship between structure symmetry, the types of point defect and generated photo-currents, this paper broadened the application scope of BSi₃ monolayer in optoelectronics and nanoelectronics and highlighted their significant values on the detection of polarization.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":792,"journal":{"name":"The European Physical Journal Plus","volume":"140 9","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144929318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Research on the laser shock control of the gap between dual gold nanoparticles","authors":"Tian Yuan,&nbsp;Wang Maolu,&nbsp;Chen Yang,&nbsp;Pei Yanbo","doi":"10.1007/s00339-025-08868-2","DOIUrl":"10.1007/s00339-025-08868-2","url":null,"abstract":"<div><p>The ultrafine gaps in metal nanostructures are of great significance for improving the performance of nano optoelectronic devices. To address the manufacturing challenges of the ultrafine gaps, a gap regulation method for metal nanostructures is proposed, which combines nanosecond pulse laser shock with momentum transfer in flexible metal thin films. By combining molecular dynamics with experimental research, the dynamic evolution process of high-density dislocations in metal nanoparticles under laser shock was studied, and the interaction between dislocation motion and grain boundaries was investigated. The micro mechanism of high strain rate superplasticity deformation of metal nanoparticles under laser shock and the synergistic deformation process of aluminum film superplasticity flow and radial expansion of gold nanoparticles under laser shock were explored. The mechanism of nanowire gap formed between dual gold nanoparticles was revealed, providing a theoretical basis for high-precision control of nanowire gaps in metal nanostructures.</p></div>","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 10","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144929384","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The prospect of confining the equation of state of neutron stars with future mass and radius measurements","authors":"Asim Kumar Saha,&nbsp;Ritam Mallick","doi":"10.1140/epjc/s10052-025-14673-1","DOIUrl":"10.1140/epjc/s10052-025-14673-1","url":null,"abstract":"<div><p>Simultaneous measurement of mass and radius with high precision is essential to unravelling the equation of state of matter at the core of neutron stars. Measurement of massive pulsars indicates that they have to be stiff at low densities. In this work, an ensemble of agnostically constructed equations of state was studied for the mass-radius measurement. The radius of neutron stars obtained from the ensemble was confined within a 10.5–14.5 km bound. Among the NICER measurements, PSR J0437–4715 provides the most stringent constraint on the equation of state. It was found that the detection of stars with smaller radii would prefer a softer equation of state, and the detection of stars with larger radii would prefer a stiffer equation of state. However, irrespective of the detection of stars with a smaller or larger radius, the sound speed peak indicates that stars are likely to have a smooth phase transition at a few times saturation densities, and the matter at the core may not be pure conformal quark matter. A better precision of the radius measurement drastically increases the chances of constraining the equation of state. The equation of state would be more effectively constrained if the measurement of large-radius stars with high precision were to happen. Precise radius measurements of neutron stars with smaller radii provide limited constraints on the equation of state over the density range relevant to neutron stars, largely independent of the stellar mass. Also, measurements for different masses are necessary to constrain the equation of state at all density ranges relevant to neutron stars.\u0000</p></div>","PeriodicalId":788,"journal":{"name":"The European Physical Journal C","volume":"85 9","pages":""},"PeriodicalIF":4.8,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1140/epjc/s10052-025-14673-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144929326","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Structural, magnetic, and antibacterial properties of Ni1− xCuxFe2O4 nanocomposites: influence of Cu substitution","authors":"Tahseen H. Mubarak,&nbsp;Mohammed B. Jumaa,&nbsp;Ali M. Mohammad","doi":"10.1007/s00339-025-08893-1","DOIUrl":"10.1007/s00339-025-08893-1","url":null,"abstract":"&lt;div&gt;&lt;p&gt;Bacterial resistance to antibiotics is a significant concern. Developing novel antibiotics frequently fails to address the swiftly escalating bacterial resistance and necessitates inventive strategies to tackle bacterial illnesses. The size-dependent antibacterial efficacy of Ni&lt;sub&gt;1− &lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Cu&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; nanocomposites was examined utilizing Ni&lt;sub&gt;1− &lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Cu&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; compositions with substitution values &lt;i&gt;x&lt;/i&gt; = 0.2, 0.4, and 0.6, synthesized by the sol-gel auto-combustion technique at a consistent calcination temperature of 425 °C for 3 h. The X-ray diffraction pattern has been employed to validate the single-phase cubic spinel structure. The average size of the crystallite increases from 37.072 nm to 42.288 nm as the substitution process varies from &lt;i&gt;x&lt;/i&gt; = 0.2 to &lt;i&gt;x&lt;/i&gt; = 0.6, resulting in crystalline size growth. The microstructural investigation was performed using the FESEM technique, revealing that the average particle size grows from 39.429 nm to 45.610 nm with heightened copper substitution. The TEM images reveal a nanoparticle structure characterized by some agglomeration, the particles exhibiting a spherical morphology, and their sizes correspond well with those obtained from XRD analyses. The FTIR examination corroborated the spinel structure of the ferrite system. Two prominent absorption bands, &lt;span&gt;(:left({v}_{2}right))&lt;/span&gt; corresponding to the octahedral site and &lt;span&gt;(:left({v}_{1}right))&lt;/span&gt; to the tetrahedral site, are evident in the spectra of the FTIR. These bands are located in approximately 560.22–567.93 cm&lt;sup&gt;−1&lt;/sup&gt; and 395.34-402.09 cm&lt;sup&gt;−1&lt;/sup&gt;, respectively. The magnetization investigations indicate that the Ni&lt;sub&gt;1− &lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Cu&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; nanocomposites have soft ferromagnetic characteristics, with a decrease in saturation magnetization from 49.2964 to 32.8189 emu/g and a reduction in coercivity from 110.6406 to 41.9433 Oe as the Cu&lt;sup&gt;2+&lt;/sup&gt; substitution increases. Surface analysis has been conducted using the synthesized nanocomposites’ isothermal BET methodology. The Ni&lt;sub&gt;1− &lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Cu&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; nanocomposites exhibited zeta potentials of -46.6, -54.5, and − 52.5 mV, respectively. Enhanced antibacterial activity was demonstrated in Ni&lt;sub&gt;1− &lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Cu&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt;Fe&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; nanocomposites with decreased copper substitution. The improvement in antibacterial activity was attributed to crystallinity and shape. When the compensation ratio for copper was &lt;i&gt;x&lt;/i&gt; = 0.2, antibacterial testing using the agar well diffusion technique revealed that &lt;i&gt;Klebsiella pneumoniae&lt;/i&gt; showed the highest effectiveness; &lt;i&gt;Neisseria gonorrhoeae&lt;/i&gt; followed, then &lt;i&gt;Bacillus subtilis&lt;/i&gt;, and &lt;i&gt;Enterococcus faecalis&lt;/i&gt;. These intriguing findings highlight the unique inhibitory properties of biocomp","PeriodicalId":473,"journal":{"name":"Applied Physics A","volume":"131 10","pages":""},"PeriodicalIF":2.8,"publicationDate":"2025-09-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144929386","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}