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Article: Simulation, Fabrication and Microfiltration Using Dual Anodic Aluminum Oxide Membrane.

Qasim, Faheem / Ashraf, Muhammad Waseem / Tayyaba, Shahzadi / Tariq, Muhammad Imran / Herrera-May, Agustín L

2023 Volume 13, Issue 10

Abstract: Microfluidic devices have gained subsequent attention due to their controlled manipulation of fluid for various biomedical applications. These devices can be used to study the behavior of fluid under several micrometer ranges within the channel. The ... ...

Abstract	Microfluidic devices have gained subsequent attention due to their controlled manipulation of fluid for various biomedical applications. These devices can be used to study the behavior of fluid under several micrometer ranges within the channel. The major applications are the filtration of fluid, blood filtration and bio-medical analysis. For the filtration of water, as well as other liquids, the micro-filtration based microfluidic devices are considered as potential candidates to fulfill the desired conditions and requirements. The micro pore membrane can be designed and fabricated in such a way that it maximizes the removal of impurities from fluid. The low-cost micro-filtration method has been reported to provide clean fluid for biomedical applications and other purposes. In the work, anodic-aluminum-oxide-based membranes have been fabricated with different pore sizes ranging from 70 to 500 nm. A soft computing technique like fuzzy logic has been used to estimate the filtration parameters. Then, the finite-element-based analysis system software has been used to study the fluid flow through the double membrane. Then, filtration is performed by using a dual membrane and the clogging of the membrane has been studied after different filtration cycles using characterization like a scanning electron microscope. The filtration has been done to purify the contaminated fluid which has impurities like bacteria and protozoans. The membranes have been tested after each cycle to verify the results. The decrease in permeance with respect to the increase in the velocity of the fluid and the permeate volume per unit clearly depicts the removal of containments from the fluid after four and eight cycles of filtration. The results clearly show that the filtration efficiency can be improved by increasing the number of cycles and adding a dual membrane in the micro-fluidic device. The results show the potential of dual anodic aluminum oxide membranes for the effective filtration of fluids for biomedical applications, thereby offering a promising solution to address current challenges.
Language	English
Publishing date	2023-10-08
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2614641-1
ISSN	2077-0375
ISSN	2077-0375
DOI	10.3390/membranes13100825
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Simulation and Analysis of Anodized Aluminum Oxide Membrane Degradation.

Manzoor, Saher / Qasim, Faheem / Ashraf, Muhammad Waseem / Tayyaba, Shahzadi / Tariq, Nimra / Herrera-May, Agustín L / Delgado-Alvarado, Enrique

Sensors (Basel, Switzerland)

2023 Volume 23, Issue 24

Abstract: Microelectromechanical systems (MEMS)-based filter with microchannels enables the removal of various microorganisms, including viruses and bacteria, from fluids. Membranes with porous channels can be used as filtration interfaces in MEMS hemofilters or ... ...

Abstract	Microelectromechanical systems (MEMS)-based filter with microchannels enables the removal of various microorganisms, including viruses and bacteria, from fluids. Membranes with porous channels can be used as filtration interfaces in MEMS hemofilters or mini-dialyzers. The main problems associated with the filtration process are optimization of membrane geometry and fouling. A nanoporous aluminum oxide membrane was fabricated using an optimized two-step anodization process. Computational strength modeling and analysis of the membrane with specified parameters were performed using the ANSYS structural module. A fuzzy simulation was performed for the numerical analysis of flux through the membrane. The membrane was then incorporated with the prototype for successive filtration. The fluid flux and permeation analysis of the filtration process have been studied. Scanning electron microscope (SEM) micrographs of membranes have been obtained before and after the filtration cycles. The SEM results indicate membrane fouling after multiple cycles, and thus the flux is affected. This type of fabricated membrane and setup are suitable for the separation and purification of various fluids. However, after several filtration cycles, the membrane was degraded. It requires a prolonged chemical cleaning. High-density water has been used for filtration purposes, so this MEMS-based filter can also be used as a mini-dialyzer and hemofilter in various applications for filtration. Such a demonstration also opens up a new strategy for maximizing filtration efficiency and reducing energy costs for the filtration process by using a layered membrane setup.
Language	English
Publishing date	2023-12-13
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2052857-7
ISSN	1424-8220 ; 1424-8220
ISSN (online)	1424-8220
ISSN	1424-8220
DOI	10.3390/s23249792
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Estimation of the Young's Modulus of Nanometer-Thick Films Using Residual Stress-Driven Bilayer Cantilevers.

Velosa-Moncada, Luis A / Raskin, Jean-Pierre / Aguilera-Cortés, Luz Antonio / López-Huerta, Francisco / Herrera-May, Agustín L

Nanomaterials (Basel, Switzerland)

2022 Volume 12, Issue 2

Abstract: Precise prediction of mechanical behavior of thin films at the nanoscale requires techniques that consider size effects and fabrication-related issues. Here, we propose a test methodology to estimate the Young's modulus of nanometer-thick films using ... ...

Abstract	Precise prediction of mechanical behavior of thin films at the nanoscale requires techniques that consider size effects and fabrication-related issues. Here, we propose a test methodology to estimate the Young's modulus of nanometer-thick films using micromachined bilayer cantilevers. The bilayer cantilevers which comprise a well-known reference layer and a tested film deflect due to the relief of the residual stresses generated during the fabrication process. The mechanical relationship between the measured residual stresses and the corresponding deflections was used to characterize the tested film. Residual stresses and deflections were related using analytical and finite element models that consider intrinsic stress gradients and the use of adherence layers. The proposed methodology was applied to low pressure chemical vapor deposited silicon nitride tested films with thicknesses ranging from 46 nm to 288 nm. The estimated Young's modulus values varying between 213.9 GPa and 288.3 GPa were consistent with nanoindentation and alternative residual stress-driven techniques. In addition, the dependence of the results on the thickness and the intrinsic stress gradient of the materials was confirmed. The proposed methodology is simple and can be used to characterize diverse materials deposited under different fabrication conditions.
Language	English
Publishing date	2022-01-14
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662255-5
ISSN	2079-4991
ISSN	2079-4991
DOI	10.3390/nano12020265
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Eco-friendly, compact, and cost-efficient triboelectric nanogenerator for renewable energy harvesting and smart motion sensing.

Delgado-Alvarado, Enrique / Martínez-Castillo, Jaime / Morales-González, Enrique A / González-Calderón, José Amir / Armendáriz-Alonso, Edgar F / Rodríguez-Liñán, Gustavo M / López-Esparza, Ricardo / Hernández-Hernández, José / Elvira-Hernández, Ernesto A / Herrera-May, Agustín L

Heliyon

2024 Volume 10, Issue 7, Page(s) e28482

Abstract: In recent years, the growth of Internet of Things devices has increased the use of sustainable energy sources. An alternative technology is offered by triboelectric nanogenerators (TENGs) that can harvest green energy and convert it into electrical ... ...

Abstract	In recent years, the growth of Internet of Things devices has increased the use of sustainable energy sources. An alternative technology is offered by triboelectric nanogenerators (TENGs) that can harvest green energy and convert it into electrical energy. Herein, we assessed three different nopal powder types that were used as triboelectric layers of eco-friendly and sustainable TENGs for renewable energy harvesting from environmental vibrations and powering electronic devices. These nanogenerators were fabricated using waste and recycled materials with a compact design for easy transportation and collocation on non-homogeneous surfaces of different vibration or motion sources. In addition, these TENGs have advantages such as high output performance, stable output voltage, lightweight, low-cost materials, and a simple fabrication process. These nanogenerators use the contact-separation mode between two triboelectric layers to convert the vibration energy into electrical energy. TENG with the best output performance is based on dehydrated nopal powder, generating an output power density of 2.145 mWm
Language	English
Publishing date	2024-03-25
Publishing country	England
Document type	Journal Article
ZDB-ID	2835763-2
ISSN	2405-8440
ISSN	2405-8440
DOI	10.1016/j.heliyon.2024.e28482
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Evaluation of the Antioxidant and Antimicrobial Potential of SiO2 Modified with Cinnamon Essential Oil (Cinnamomum Verum) for Its Use as a Nanofiller in Active Packaging PLA Films

Martínez-Aguilar, Verónica / Peña-Juárez, Mariana G. / Carrillo-Sanchez, Perla C. / López-Zamora, Leticia / Delgado Alvarado, Enrique / Gutierrez-Castañeda, Emmanuel J. / Flores-Martínez, Norma L. / Herrera-May, Agustín L. / Gonzalez-Calderon, Jose Amir

Antioxidants. 2023 May 12, v. 12, no. 5

2023

Abstract: One of the main causes of food spoilage is the lipid oxidation of its components, which generates the loss of nutrients and color, together with the invasion of pathogenic microorganisms. In order to minimize these effects, active packaging has played an ...

Abstract	One of the main causes of food spoilage is the lipid oxidation of its components, which generates the loss of nutrients and color, together with the invasion of pathogenic microorganisms. In order to minimize these effects, active packaging has played an important role in preservation in recent years. Therefore, in the present study, an active packaging film was developed using polylactic acid (PLA) and silicon dioxide (SiO₂) nanoparticles (NPs) (0.1% w/w) chemically modified with cinnamon essential oil (CEO). For the modification of the NPs, two methods (M1 and M2) were tested, and their effects on the chemical, mechanical, and physical properties of the polymer matrix were evaluated. The results showed that CEO conferred to SiO₂ NPs had a high percentage of 2,2-diphenyl-l-picrylhydrazyl (DPPH) free radical inhibition (>70%), cell viability (>80%), and strong inhibition to E. coli, at 45 and 11 µg/mL for M1 and M2, respectively, and thermal stability. Films were prepared with these NPs, and characterizations and evaluations on apple storage were performed for 21 days. The results show that the films with pristine SiO₂ improved tensile strength (28.06 MPa), as well as Young’s modulus (0.368 MPa) since PLA films only presented values of 27.06 MPa and 0.324 MPa, respectively; however, films with modified NPs decreased tensile strength values (26.22 and 25.13 MPa), but increased elongation at break (from 5.05% to 10.32–8.32%). The water solubility decreased from 15% to 6–8% for the films with NPs, as well as the contact angle, from 90.21° to 73° for the M2 film. The water vapor permeability increased for the M2 film, presenting a value of 9.50 × 10⁻⁸ g Pa⁻¹ h⁻¹ m⁻². FTIR analysis indicated that the addition of NPs with and without CEO did not modify the molecular structure of pure PLA; however, DSC analysis indicated that the crystallinity of the films was improved. The packaging prepared with M1 (without Tween 80) showed good results at the end of storage: lower values in color difference (5.59), organic acid degradation (0.042), weight loss (24.24%), and pH (4.02), making CEO-SiO₂ a good component to produce active packaging.
Keywords	Cinnamomum verum ; Escherichia coli ; antioxidants ; apples ; cell viability ; cinnamon ; color ; contact angle ; crystal structure ; essential oils ; food spoilage ; free radicals ; lipid peroxidation ; nanoparticles ; pH ; permeability ; polylactic acid ; polysorbates ; silica ; tensile strength ; thermal stability ; water solubility ; water vapor ; weight loss
Language	English
Dates of publication	2023-0512
Publishing place	Multidisciplinary Digital Publishing Institute
Document type	Article ; Online
ZDB-ID	2704216-9
ISSN	2076-3921
ISSN	2076-3921
DOI	10.3390/antiox12051090
Database	NAL-Catalogue (AGRICOLA)

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Article ; Online: A Portable Triboelectric Nanogenerator Based on Dehydrated Nopal Powder for Powering Electronic Devices.

Elvira-Hernández, Ernesto A / Nava-Galindo, Omar I / Martínez-Lara, Elisa K / Delgado-Alvarado, Enrique / López-Huerta, Francisco / De León, Arxel / Gallardo-Vega, Carlos / Herrera-May, Agustín L

Sensors (Basel, Switzerland)

2023 Volume 23, Issue 9

Abstract: Triboelectric nanogenerators (TENGs) based on organic materials can harvest green energy to convert it into electrical energy. These nanogenerators could be used for Internet-of-Things (IoT) devices, substituting solid-state chemical batteries that have ... ...

Abstract	Triboelectric nanogenerators (TENGs) based on organic materials can harvest green energy to convert it into electrical energy. These nanogenerators could be used for Internet-of-Things (IoT) devices, substituting solid-state chemical batteries that have toxic materials and limited-service time. Herein, we develop a portable triboelectric nanogenerator based on dehydrated nopal powder (NOP-TENG) as novel triboelectric material. In addition, this nanogenerator uses a polyimide film tape adhered to two copper-coated Bakelite plates. The NOP-TENG generates a power density of 2309.98 μW·m
Language	English
Publishing date	2023-04-22
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2052857-7
ISSN	1424-8220 ; 1424-8220
ISSN (online)	1424-8220
ISSN	1424-8220
DOI	10.3390/s23094195
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Evaluation of the Antioxidant and Antimicrobial Potential of SiO

Martínez-Aguilar, Verónica / Peña-Juárez, Mariana G / Carrillo-Sanchez, Perla C / López-Zamora, Leticia / Delgado-Alvarado, Enrique / Gutierrez-Castañeda, Emmanuel J / Flores-Martínez, Norma L / Herrera-May, Agustín L / Gonzalez-Calderon, Jose Amir

Antioxidants (Basel, Switzerland)

2023 Volume 12, Issue 5

Abstract	One of the main causes of food spoilage is the lipid oxidation of its components, which generates the loss of nutrients and color, together with the invasion of pathogenic microorganisms. In order to minimize these effects, active packaging has played an important role in preservation in recent years. Therefore, in the present study, an active packaging film was developed using polylactic acid (PLA) and silicon dioxide (SiO
Language	English
Publishing date	2023-05-12
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2704216-9
ISSN	2076-3921
ISSN	2076-3921
DOI	10.3390/antiox12051090
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Chemically Modified Nanoparticles for Enhanced Antioxidant and Antimicrobial Properties with Cinnamon Essential Oil.

López-Cano, Aaron A / Martínez-Aguilar, Verónica / Peña-Juárez, Mariana G / López-Esparza, Ricardo / Delgado-Alvarado, Enrique / Gutiérrez-Castañeda, Emmanuel J / Del Angel-Monroy, Mayra / Pérez, Elías / Herrera-May, Agustín L / Gonzalez-Calderon, J Amir

Antioxidants (Basel, Switzerland)

2023 Volume 12, Issue 12

Abstract: We explored the potential of different nanoparticles ( ... ...

Abstract	We explored the potential of different nanoparticles (TiO
Language	English
Publishing date	2023-11-29
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2704216-9
ISSN	2076-3921
ISSN	2076-3921
DOI	10.3390/antiox12122057
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Green Route to Produce Silver Nanoparticles Using the Bioactive Flavonoid Quercetin as a Reducing Agent and Food Anti-Caking Agents as Stabilizers.

Ramírez-Rosas, Sofia L / Delgado-Alvarado, Enrique / Sanchez-Vargas, Luis O / Herrera-May, Agustin L / Peña-Juarez, Mariana G / Gonzalez-Calderon, J Amir

Nanomaterials (Basel, Switzerland)

2022 Volume 12, Issue 19

Abstract: In previous work, the isolated polyphenolic compound (PPC) quercetin was used as a reducing agent in the formation of silver nanoparticles (AgNPs), testing two types of quercetin. This PPC is a bioactive molecule that provides the electrons for the ... ...

Abstract	In previous work, the isolated polyphenolic compound (PPC) quercetin was used as a reducing agent in the formation of silver nanoparticles (AgNPs), testing two types of quercetin. This PPC is a bioactive molecule that provides the electrons for the reduction of silver ions to zerovalent silver. The results demonstrated that quercetin in dietary supplement presentation was better than reagent grade quercetin for the synthesis of AgNPs, and the difference between them was that the dietary supplement had microcrystalline cellulose (CM) in its formulation. Therefore, this dietary anti-caking agent was added to the reagent-grade quercetin to validate this previously found improvement. AgNPs were obtained at neutral pH by a green route using quercetin as a reducing agent and microcrystalline cellulose and maltodextrin as stabilizing agents. In addition, different ratios were evaluated to find the optimum ratio. Ultraviolet-Visible spectroscopy (UV-VIS), Atomic Force Microscope (AFM), Z-potential, Dynamic Light Scattering (DLS) and X-ray Powder Diffraction (XRD) were used for characterization. The antibacterial activity of the
Language	English
Publishing date	2022-10-10
Publishing country	Switzerland
Document type	Journal Article
ZDB-ID	2662255-5
ISSN	2079-4991
ISSN	2079-4991
DOI	10.3390/nano12193545
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article: Triboelectric and Piezoelectric Nanogenerators for Self-Powered Healthcare Monitoring Devices: Operating Principles, Challenges, and Perspectives.

Delgado-Alvarado, Enrique / Martínez-Castillo, Jaime / Zamora-Peredo, Luis / Gonzalez-Calderon, Jose Amir / López-Esparza, Ricardo / Ashraf, Muhammad Waseem / Tayyaba, Shahzadi / Herrera-May, Agustín L

Nanomaterials (Basel, Switzerland)

2022 Volume 12, Issue 24

Abstract: The internet of medical things (IoMT) is used for the acquisition, processing, transmission, and storage of medical data of patients. The medical information of each patient can be monitored by hospitals, family members, or medical centers, providing ... ...

Abstract	The internet of medical things (IoMT) is used for the acquisition, processing, transmission, and storage of medical data of patients. The medical information of each patient can be monitored by hospitals, family members, or medical centers, providing real-time data on the health condition of patients. However, the IoMT requires monitoring healthcare devices with features such as being lightweight, having a long lifetime, wearability, flexibility, safe behavior, and a stable electrical performance. For the continuous monitoring of the medical signals of patients, these devices need energy sources with a long lifetime and stable response. For this challenge, conventional batteries have disadvantages due to their limited-service time, considerable weight, and toxic materials. A replacement alternative to conventional batteries can be achieved for piezoelectric and triboelectric nanogenerators. These nanogenerators can convert green energy from various environmental sources (e.g., biomechanical energy, wind, and mechanical vibrations) into electrical energy. Generally, these nanogenerators have simple transduction mechanisms, uncomplicated manufacturing processes, are lightweight, have a long lifetime, and provide high output electrical performance. Thus, the piezoelectric and triboelectric nanogenerators could power future medical devices that monitor and process vital signs of patients. Herein, we review the working principle, materials, fabrication processes, and signal processing components of piezoelectric and triboelectric nanogenerators with potential medical applications. In addition, we discuss the main components and output electrical performance of various nanogenerators applied to the medical sector. Finally, the challenges and perspectives of the design, materials and fabrication process, signal processing, and reliability of nanogenerators are included.
Language	English
Publishing date	2022-12-09
Publishing country	Switzerland
Document type	Journal Article ; Review
ZDB-ID	2662255-5
ISSN	2079-4991
ISSN	2079-4991
DOI	10.3390/nano12244403
Database	MEDical Literature Analysis and Retrieval System OnLINE

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