Elena P. Ivanova

Elena P. Ivanova
RMIT University | RMIT · School of Science

About

558
Publications
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15,371
Citations

Publications

Publications (558)
Cover Page
Full-text available
It is shown that the antibacterial action of ultrasmall atomically precise gold nanoclusters (AuNC; 2 nm diameter) was directly linked to translocation of the AuNC into the cytoplasm, as evidenced by the localization of AuNC inside the bacterial cells. It is proposed that AuNC does not damage the membrane, as they are freely translocated, but cause...
Article
Full-text available
Exposure to high-frequency (HF) electromagnetic fields (EMFs) at 18 GHz was previously found to induce reversible cell permeabilization in eukaryotic cells; however, the fate of internalized foreign objects inside the cell remains unclear. Here, silica core–shell gold nanospheres (Au NS) of 20 ± 5 nm diameter were used to study the localization of...
Article
Ultrasmall metal nanoclusters (NCs) are employed in an array of diagnostic and therapeutic applications due to their tunable photoluminescence, high biocompatibility, polyvalent effect, ease of modification, and photothermal stability. However, gold nanoclusters' (AuNCs') intrinsically antimicrobial properties remain poorly explored and are not wel...
Article
Low‐ and negative‐value (waste) products represent a valuable resource. Its use as a source for the fabrication of high value materials represents a lucrative pathway to increasing sustainability and decreasing the economic cost of various industries. Thermochemical methods for the valorization of biowaste and low‐value natural products are simple...
Article
Nanomaterials have emerged as the new weapon in the arsenal to fight antimicrobial resistance (AMR). While antibiotics have played a major role in combating infectious diseases, AMR presents a new challenge for sustainability in global health, food security and development. Inspired by nature, recent trending research has demonstrated that specific...
Article
Laser Chemistry In their Research Article (e202117227), Yasuyuki Tsuboi et al. report an optical tweezer technique using nanotextured Si that can efficiently trap polymer chains. The fluorescence color of the perylene‐labeled polymer chains can be controlled by changing the laser intensity.
Article
Laser‐Chemie In ihrem Forschungsartikel (e202117227) berichten Yasuyuki Tsuboi et al. über eine optische Pinzettentechnik mit nanotexturiertem Si, mit der Polymerketten effizient eingefangen werden können. Die Fluoreszenzfarbe der perylenmarkierten Polymerketten kann über die Laserintensität gesteuert werden.
Article
Full-text available
Atomic force microscopy (AFM) was used to investigate the morphology and rigidity of the opportunistic pathogenic yeast, Candida albicans ATCC 10231, during its attachment to surfaces of three levels of nanoscale surface roughness. Non-polished titanium (npTi), polished titanium (pTi), and glass with respective average surface roughness (Sa) values...
Article
A variety of coating techniques are available for medical devices to be tailored with surface properties aimed at optimizing their performance in biological environments. Cold spray, as a member of the thermal spray family, is now being exploited to efficiently deposit micro- to nanometer sized metallic or non-metallic particles on surgical implant...
Article
The Front Cover illustrates fabricated 3D‐printed titanium alloy model implants modified by electrochemical anodization to generate vertically aligned titania nanotubes (TNTs) on the surface with specific diameters (∼100 nm) aiming to reduce bone cell attachment and proliferation. To achieve enhanced antibacterial performance, the nanotubes were lo...
Article
The ability to modulate, tune, and control fluorescence colour has attracted much attention in photonics-related research fields. The most examined approach has been the design and synthesis of luminescent materials such as luminescent nanocrystals (i.e., quantum dots). However, thus far, it has been impossible to achieve fluorescence colour contro...
Article
The ability to modulate, tune, and control fluorescence colour has attracted much attention in photonics-related research fields. The most examined approach has been the design and synthesis of luminescent materials such as luminescent nanocrystals (i.e., quantum dots). However, thus far, it has been impossible to achieve fluorescence colour contro...
Article
Full-text available
Plastic pollution is recognized as a major environmental problem in many countries. Over the last decade, academics have embraced research on bioplastics to discover newer high-end green materials. However, the end-of-life environmental fate of such materials is not adequately understood. Non-isocyanate polyhydroxyurethanes (PHUs) are green enginee...
Article
Full-text available
Plasma polymer coatings fabricated from Melaleuca alternifolia essential oil and its derivatives have been previously shown to reduce the extent of microbial adhesion on titanium, polymers, and other implantable materials used in dentistry. Previous studies have shown these coatings to maintain their performance under standard operating conditions;...
Article
Marine biofouling remains one of the key challenges for maritime industries, both for seafaring and stationary structures. Currently used biocide-based approaches suffer from significant drawbacks, coming at a significant cost to the environment into which the biocides are released, whereas novel environmentally friendly approaches are often diffic...
Conference Paper
Coded aperture imaging (CAI) methods offer multidimensional and multispectral imaging capabilities with minimal resources than needed in a lens-based direct imager. In a CAI method, the light diffracted from an object is modulated by a coded mask, and the resulting intensity distribution is recorded. Most of the CAI techniques involve two steps: re...
Article
Paediatric titanium (Ti) implants are used for the short‐term fixation of fractures, after which they are removed. However, bone overgrowth on the implant surface can complicate their removal. The current Ti implants research focuses on improving their osseointegration and antibacterial properties for long‐term use while overlooking the requirement...
Article
Full-text available
Membrane model systems capable of mimicking live cell membranes were used for the first time in studying the effects arising from electromagnetic fields (EMFs) of 18 GHz where membrane permeability was observed following exposure. A present lack of understanding of the mechanisms that drive such a rapid change in membrane permeabilization as well a...
Article
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Plasma-enhanced synthesis and modification of polymers is a field that continues to expand and become increasingly more sophisticated. The highly reactive processing environments afforded by the inherently dynamic nature of plasma media are often superior to ambient or thermal environments, offering substantial advantages over other processing meth...
Article
Full-text available
Image enhancement techniques (such as edge and contrast enhancement) are essential for many imaging applications. In incoherent holography techniques such as Fresnel incoherent correlation holography (FINCH), the light from an object is split into two, each of which is modulated differently from one another by two different quadratic phase function...
Article
Hypothesis: The ability exhibited by insect wings to resist microbial infestation is a unique feature developed over 400 million years of evolution in response to lifestyle and environmental pressures. The self-cleaning and antimicrobial properties of insect wings may be attributed to the unique combination of nanoscale structures found on the wing...
Article
Full-text available
Polymer matrix composite materials have the capacity to aid the indirect transmission of viral diseases. Published research shows that respiratory viruses, including severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2 or COVID‐19), can attach to polymer substrata as a result of being contacted by airborne droplets resulting from infected pe...
Article
Full-text available
Nanocellulose is at the cutting edge of current research owing to its highly useful features, such as abundance and renewability of its source, biocompatibility, nanoscale dimension, high specific surface area, and tunable surface chemistry. Its multifunctional characteristics present opportunities for novel applications across a wide range of emer...
Article
Full-text available
The fungal infestation in construction industries is a major problem with a very high removal cost that needs to be controlled not only to prevent the fouling of surfaces but also to prevent allergic reactions or respiratory problems especially in immunocompromised individuals. To combat fungal invasion, several experimental approaches to produce a...
Article
Full-text available
It is commonly accepted that nanoparticles (NPs) can kill bacteria; however, the mechanism of antimicrobial action remains obscure for large NPs that cannot translocate the bacterial cell wall. It is demonstrated that the increase in membrane tension caused by the adsorption of NPs is responsible for mechanical deformation, leading to cell rupture...
Cover Page
Full-text available
The antibacterial action of large (>10 nm) spherical gold nanoparticles is demonstrated by Elena P. Ivanova and co‐workers in article number 2005679 to be attributed to the combined stretching and rupture of the bacterial cell membrane. The newly discovered mechanical modes of antibacterial action pose varied implications for the use and applicatio...
Article
The microbial contamination of surfaces presents a significant challenge due to the adverse effects associated with biofilm formation, particularly on implantable devices. Here, the attachment and biofilm formation of the opportunistic human pathogen, Candida albicans ATCC 10231, were studied on surfaces with decreasing magnitudes of nanoscale roug...
Article
Despite advances in the development of bone substitutes and strict aseptic procedures, the majority of failures in bone grafting surgery are related to nosocomial infections. Development of biomaterials combining both osteogenic and antibiotic activity is, therefore, a crucial public health issue. Herein, two types of intrinsically bactericidal tit...
Article
Next generation wound care technology capable of diagnosing wound parameters, promoting healthy cell growth, and reducing pathogenic infections noninvasively would provide patients with an improved standard of care and accelerated wound repair. Temperature is one of the indicating biomarkers specific to chronic wounds. This work reports a hybrid, m...
Article
Materials based on petroleum-based resources have aroused widespread concern because of their environmental and healthcare footprints. Cellulose nanocrystals (CNCs) are at the cutting edge of current research because of their great promise in developing sustainable and high-performance materials. To establish a comprehensive understanding of the sy...
Article
Full-text available
Quantitative phase imaging (QPI) techniques are widely used for the label-free examining of transparent biological samples. QPI techniques can be broadly classified into interference-based and interferenceless methods. The interferometric methods which record the complex amplitude are usually bulky with many optical components and use coherent illu...
Article
Full-text available
Fresnel incoherent correlation holography (FINCH) is a self-interference based super-resolution three-dimensional imaging technique. FINCH in inline configuration requires an active phase modulator to record at least three phase-shifted camera shots to reconstruct objects without twin image and bias terms. In this study, FINCH is realized using a r...
Article
Full-text available
Multispectral imaging technology is a valuable scientific tool for various applications in astronomy, remote sensing, molecular fingerprinting, and fluorescence imaging. In this study, we demonstrate a single camera shot, lensless, interferenceless, motionless, non-scanning, space, spectrum, and time resolved five-dimensional incoherent imaging tec...
Article
Antibiotic resistance is a global human health threat, causing routine treatments of bacterial infections to become increasingly difficult. The problem is exacerbated by biofilm formation by bacterial pathogens on the surfaces of indwelling medical and dental devices that facilitate high levels of tolerance to antibiotics. The development of new an...
Article
Full-text available
The thermal properties of novel nanomaterials play a significant role in determining the performance of the material in technological applications. Herein, direct measurement of the temperature diffusivity of nanocellulose-doped starch–polyurethane nanocomposite films was carried out by the micro-contact method. Polymer films containing up to 2 wt%...
Preprint
Full-text available
The thermal properties of novel nanomaterials play a significant role in determining the performance of the material in technological applications. Herein, direct measurement of the temperature diffusivity of cellulose nanocomposite films was carried out by the micro-contact method. Polymer films containing up to 2%wt. of nanocellulose were synthes...
Article
Full-text available
The mechano-bactericidal activity of nanostructured surfaces has become the focus of intensive research toward the development of a new generation of antibacterial surfaces, particularly in the current era of emerging antibiotic resistance. This work demonstrates the effects of an incremental increase of nanopillar height on nanostructure-induced b...
Article
The self-organised conical needles produced by plasma etching of silicon (Si), known as black silicon (b-Si), create a form-birefringent surface texture when etching of Si orientated at angles of θi < 50 − 70° (angle between the Si surface and vertical plasma E-field). The height of the needles in the form-birefringent region following 15 min etchi...
Article
Full-text available
The fabrication and characterization of photoanodes based on black-Si (b-Si) are presented using a photoelectrochemical cell in NaOH solution. B-Si was fabricated by maskless dry plasma etching and was conformally coated by tens-of-nm of TiO2 using atomic layer deposition (ALD) with a top layer of CoO x cocatalyst deposited by pulsed laser depositi...
Preprint
Full-text available
The fabrication and characterisation of photo-anodes based on black-Si (b-Si) are presented using a photo-electrochemical cell in NaOH solution. Black-Si was fabricated by maskless dry plasma etching and was conformally coated by tens-of-nm of TiO2 using atomic layer deposition (ALD) with a top layer of CoOx cocatalyst deposited by pulsed laser dep...
Article
Plasma processing, e.g., functionalisation and deposition of antibacterial coatings, is often used to enhance surface properties of biomaterials. Plasma is, however, a non-uniform active medium, and the result of processing depends on the nature of both the plasma and the substratum. Here we show that when an antibacterial coating (i.e., polyterpen...
Preprint
The self-organised conical needles produced by plasma etching of silicon (Si), known as black silicon (b-Si), create a form-birefringent surface texture when etching of Si orientated at angles of $\theta_i < 50 - 70^\circ$ (angle between the Si surface and vertical plasma E-field). The height of the needles in the form-birefringent region following...
Chapter
Ce.le.ri.bac'ter. L. adj. celer ‐eris ‐e quick, rapid; N.L. masc. n. bacter rod; N.L. masc. n. Celeribacter rapidly growing rod. Proteobacteria / Alphaproteobacteria / Rhodobacterales / Rhodobacteraceae / Celeribacter Gram‐negative, non‐spore‐forming rods between 0.8–3.4 μm in length and 0.3–1.2 μm in width. Motile or nonmotile; some species have a...
Article
Microbial contamination of polymer surfaces has become a significant challenge in domestic, industrial, and biomedical applications. Recent progress in our understanding of how topographical features of different length scales can be used to effectively and selectively control the attachment and proliferation of different cell types has provided an...
Preprint
Detection of phase variations across optically transparent samples is often a difficult task. We propose and demonstrate a compact, lightweight and low cost quantitative phase contrast imager. Light diffracted from a pinhole is incident on a thick object and the modulated light is collected by an image sensor and the intensity pattern is recorded....
Preprint
Full-text available
Fresnel incoherent correlation holography (FINCH) is a self-interference based super-resolution three-dimensional imaging technique. FINCH in inline configuration requires an active phase modulator and at least three camera shots to reconstruct objects without the twin image and bias terms. In this study, FINCH is realized using a randomly multiple...
Article
Full-text available
In this work, we report on the incorporation of a siloxane copolymer additive, poly((2-phenylethyl) methylsiloxane)-co(1-phenylethyl) methylsiloxane)-co-dimethylsiloxane), which is fully soluble at room temperature, in a rapid-cure thermoset polyester coating formulation. The additive undergoes polymerization-induced phase segregation (PIPS) to sel...
Article
Abstract Hypothesis Titanium and titanium alloys are often the most popular choice of material for the manufacture of medical implants; however, they remain susceptible to the risk of device-related infection caused by the presence of pathogenic bacteria. Hydrothermal etching of titanium surfaces, to produce random nanosheet topologies, has shown r...
Article
Nanostructured mechano-bactericidal surfaces represent a promising technology to prevent the incidence of microbial contamination on a variety of surfaces and to avoid bacterial infection, particularly with antibiotic resistant strains. In this work, a regular array of silicon nanopillars of 380 nm height and 35 nm diameter was used to study the re...
Article
Additively manufactured selective laser melted titanium (SLM-Ti) opens the possibility of tailored medical implants for patients. Despite orthopedic implant advancements, significant problems remain with regards to sub-optimal osseointegration at the interface between the implant and surrounding tissue. Here we show that applying a nanodiamond (ND)...
Article
The colonisation of biomaterial surfaces by pathogenic bacteria is a significant issue of concern, particularly in light of the rapid rise of antibiotic resistance. Current strategies are proving ineffective as multi-drug resistant pathogenic bacteria emerge. Recently, it was discovered that surfaces with nanoscale features are capable of physicall...
Article
Full-text available
Biomaterials that have been newly implanted inside the body are the substratum targets for a “race for the surface”, in which bacterial cells compete against eukaryotic cells for the opportunity to colonize the surface. A victory by the former often results in biomaterial-associated infections, which can be a serious threat to patient health and ca...
Article
Full-text available
The nanoscale composition of silk defining its unique properties via a hierarchial structural anisotropy needs to be analysed at the highest spatial resolution of tens of nanometers corresponding to the size of fibrils made of β-sheets, which are the crystalline building blocks of silk. Nanoscale optical and structural properties of silk have been...
Article
A straightforward approach for the fabrication of wrinkled amorphous graphite‐like carbon (G‐aC) coatings on polystyrene substrata is developed by taking advantage of the buckling, buckling‐driven delamination, and cracking processes occurring at the unstable G‐aC/polystyrene interface. This work provides a valuable insight into the role that extra...
Article
Full-text available
Recent technological advances have allowed the development of a new generation of nanostructured materials, such as those displaying both mechano-bactericidal activity and substrata that favor the growth of mammalian cells. Nanomaterials that come into contact with biological media such as blood first interact with proteins, hence understanding the...