1
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Puente EG, Sivasankaran RP, Vinciguerra D, Yang J, Lower HAC, Hevener AL, Maynard HD. Uniform trehalose nanogels for glucagon stabilization. RSC APPLIED POLYMERS 2024; 2:473-482. [PMID: 38800515 PMCID: PMC11114568 DOI: 10.1039/d3lp00226h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 02/14/2024] [Indexed: 05/29/2024]
Abstract
Glucagon is a peptide hormone that acts via receptor-mediated signaling predominantly in the liver to raise glucose levels by hepatic glycogen breakdown or conversion of noncarbohydrate, 3 carbon precursors to glucose by gluconeogenesis. Glucagon is administered to reverse severe hypoglycemia, a clinical complication associated with type 1 diabetes. However, due to low stability and solubility at neutral pH, there are limitations in the current formulations of glucagon. Trehalose methacrylate-based nanoparticles were utilized as the stabilizing and solubilizing moiety in the system reported herein. Glucagon was site-selectively modified to contain a cysteine at amino acid number 24 to covalently attach to the methacrylate-based polymer containing pyridyl disulfide side chains. PEG2000 dithiol was employed as the crosslinker to form uniform nanoparticles. Glucagon nanogels were monitored in Dulbecco's phosphate-buffered saline (DPBS) pH 7.4 at various temperatures to determine its long-term stability in solution. Glucagon nanogels were stable up to at least 5 months by size uniformity when stored at -20 °C and 4 °C, up to 5 days at 25 °C, and less than 12 hours at 37 °C. When glucagon stability was studied by either HPLC or thioflavin T assays, the glucagon was intact for at least 5 months at -20 °C and 4 °C within the nanoparticles at -20 °C and 4 °C and up to 2 days at 25 °C. Additionally, the glucagon nanogels were studied for toxicity and efficacy using various assays in vitro. The findings indicate that the nanogels were nontoxic to fibroblast cells and nonhemolytic to red blood cells. The glucagon in the nanogels was as active as glucagon alone. These results demonstrate the utility of trehalose nanogels towards a glucagon formulation with improved stability and solubility in aqueous solutions, particularly useful for storage at cold temperatures.
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Affiliation(s)
- Ellie G Puente
- Department of Chemistry and Biochemistry, University of California, Los Angeles 607 Charles E. Young Drive East Los Angeles California 90095-1569 USA
- California Nanosystems Institute, University of California, Los Angeles 570 Westwood Plaza Los Angeles California 90095-1569 USA
| | - Rajalakshmi P Sivasankaran
- Department of Chemistry and Biochemistry, University of California, Los Angeles 607 Charles E. Young Drive East Los Angeles California 90095-1569 USA
- California Nanosystems Institute, University of California, Los Angeles 570 Westwood Plaza Los Angeles California 90095-1569 USA
| | - Daniele Vinciguerra
- Department of Chemistry and Biochemistry, University of California, Los Angeles 607 Charles E. Young Drive East Los Angeles California 90095-1569 USA
- California Nanosystems Institute, University of California, Los Angeles 570 Westwood Plaza Los Angeles California 90095-1569 USA
| | - Jane Yang
- Department of Chemistry and Biochemistry, University of California, Los Angeles 607 Charles E. Young Drive East Los Angeles California 90095-1569 USA
- California Nanosystems Institute, University of California, Los Angeles 570 Westwood Plaza Los Angeles California 90095-1569 USA
| | - Haillie-Ann C Lower
- Department of Chemistry and Biochemistry, University of California, Los Angeles 607 Charles E. Young Drive East Los Angeles California 90095-1569 USA
- California Nanosystems Institute, University of California, Los Angeles 570 Westwood Plaza Los Angeles California 90095-1569 USA
| | - Andrea L Hevener
- Division of Endocrinology, Diabetes, and Hypertension, Department of Medicine, David Geffen School of Medicine University of California, Los Angeles Los Angeles CA USA
- Department of Medicine and VA Greater Los Angeles Healthcare System GRECC Los Angeles CA 90073 USA
| | - Heather D Maynard
- Department of Chemistry and Biochemistry, University of California, Los Angeles 607 Charles E. Young Drive East Los Angeles California 90095-1569 USA
- California Nanosystems Institute, University of California, Los Angeles 570 Westwood Plaza Los Angeles California 90095-1569 USA
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2
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Orsini SF, Cipolla L, Petroni S, Dirè S, Ceccato R, Callone E, Bongiovanni R, Dalle Vacche S, Di Credico B, Mostoni S, Nisticò R, Raimondo L, Scotti R, D’Arienzo M. Synthesis and Characterization of Alkoxysilane-Bearing Photoreversible Cinnamic Side Groups: A Promising Building-Block for the Design of Multifunctional Silica Nanoparticles. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:15662-15671. [PMID: 36480813 PMCID: PMC9776512 DOI: 10.1021/acs.langmuir.2c02472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 11/22/2022] [Indexed: 06/17/2023]
Abstract
The present study reports on the synthesis of a new alkoxysilane-bearing light-responsive cinnamyl group and its application as a surface functionalization agent for the development of SiO2 nanoparticles (NPs) with photoreversible tails. In detail, cinnamic acid (CINN) was activated with N-hydroxysuccinimide (NHS) to obtain the corresponding NHS-ester (CINN-NHS). Subsequently, the amine group of 3-aminopropyltriethoxysilane (APTES) was acylated with CINN-NHS leading to the generation of a novel organosilane, CINN-APTES, which was then exploited for decorating SiO2 NPs. The covalent bond to the silica surface was confirmed by solid state NMR, whereas thermogravimetric analysis unveiled a functionalization degree much higher compared to that achieved by a conventional double-step post-grafting procedure. In light of these intriguing results, the strategy was successfully extended to naturally occurring sepiolite fibers, widely employed as fillers in technological applications. Finally, a preliminary proof of concept of the photoreversibility of the obtained SiO2@CINN-APTES system has been carried out through UV diffuse reflectance. The overall outcomes prove the consistency and the versatility of the methodological protocol adopted, which appears promising for the design of hybrid NPs to be employed as building blocks for photoresponsive materials with the ability to change their molecular structure and subsequent properties when exposed to different light stimuli.
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Affiliation(s)
- Sara Fernanda Orsini
- Department
of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy
| | - Laura Cipolla
- Department
of Biotechnology and Biosciences, University
of Milano-Bicocca, P.za
della Scienza 2, 20126 Milano, Italy
| | - Simona Petroni
- Department
of Biotechnology and Biosciences, University
of Milano-Bicocca, P.za
della Scienza 2, 20126 Milano, Italy
| | - Sandra Dirè
- “Klaus
Müller” Magnetic Resonance Laboratory, Department of
Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy
| | - Riccardo Ceccato
- Department
Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy
| | - Emanuela Callone
- “Klaus
Müller” Magnetic Resonance Laboratory, Department of
Industrial Engineering, University of Trento, Via Sommarive 9, 38123 Trento, Italy
| | - Roberta Bongiovanni
- Department
of Applied Science and Technology, DISAT, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
- Consorzio
Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali,
(INSTM), Via G. Giusti,
9, 50121 Firenze, Italy
| | - Sara Dalle Vacche
- Department
of Applied Science and Technology, DISAT, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
- Consorzio
Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali,
(INSTM), Via G. Giusti,
9, 50121 Firenze, Italy
| | - Barbara Di Credico
- Department
of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy
| | - Silvia Mostoni
- Department
of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy
| | - Roberto Nisticò
- Department
of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy
| | - Luisa Raimondo
- Department
of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy
| | - Roberto Scotti
- Department
of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy
- Consorzio
Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali,
(INSTM), Via G. Giusti,
9, 50121 Firenze, Italy
| | - Massimiliano D’Arienzo
- Department
of Materials Science, University of Milano-Bicocca, Via R. Cozzi 55, 20125 Milano, Italy
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3
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Szekrényes DP, Hamon C, Constantin D, Deák A. Formation of kinetically trapped small clusters of PEGylated gold nanoparticles revealed by the combination of small-angle X-ray scattering and visible light spectroscopy. SOFT MATTER 2022; 18:8295-8301. [PMID: 36285730 DOI: 10.1039/d2sm01257j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Gold nanoparticles coated with polyethylene glycol (PEG) are able to form clusters due to the collapse of the surface-grafted polymer chains when the temperature and ion concentration of the aqueous medium are increased. The chain collapse reduces the steric repulsion, leading to particle aggregation. In this work, we combine small angle X-ray scattering (SAXS) and visible light spectroscopy to elucidate the structure of the developing clusters. The structure derived from the SAXS measurements reveals a decrease in interparticle distance and drastic narrowing of its distribution in the cluster, indicating restricted particle mobility and displacement within the cluster. Surprisingly, instead of forming a large crystalline phase, the evolving clusters are composed of about a dozen particles. The experimental optical extinction spectra measured during cluster formation can be very well reproduced by optical simulations based on the SAXS-derived structural data.
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Affiliation(s)
| | - Cyrille Hamon
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France
| | - Doru Constantin
- Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, 91405 Orsay, France
- Institut Charles Sadron, CNRS and Université de Strasbourg, 67034 Strasbourg, France.
| | - András Deák
- Centre for Energy Research, 1121, Budapest, Hungary.
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4
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Kumar I, Gangwar C, Yaseen B, Pandey PK, Mishra SK, Naik RM. Kinetic and Mechanistic Studies of the Formation of Silver Nanoparticles by Nicotinamide as a Reducing Agent. ACS OMEGA 2022; 7:13778-13788. [PMID: 35559139 PMCID: PMC9088940 DOI: 10.1021/acsomega.2c00046] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2022] [Accepted: 04/01/2022] [Indexed: 05/11/2023]
Abstract
Here, in the present study, silver nanoparticles (SNPs) in the size range 6-10 nm have been synthesized by a chemical reduction method using nicotinamide (NTA), an anti-inflammatory agent, and cetyltrimethylammonium bromide (CTAB), a good stabilizing agent, to preparing the nanoparticles in the 6-10 nm size range. Kinetic studies on the formation of SNPs have been performed spectrophotometrically at 410 nm (strong plasmon band) in aqueous medium as a function of [AgNO3], [NTA], [NaOH], and [CTAB]. The plot of ln(A ∞ - A t ) versus time exhibited a straight line and the pseudo-first-order rate constants of different variables were calculated from its slope. On the basis of experimental findings, a plausible mechanism was proposed for the formation of SNPs colloid. From the mechanism, it is proved that the reduction of silver ions proceeded through the formation of silver oxide in colloidal form by their reaction with hydroxide ions and NTA after performing their function and readily undergo hydrolysis to form nicotinic acid as a hydrolysis product with the release of ammonia gas. The preliminary characterization of the SNPs was carried out by using a UV-visible spectrophotometer. The detailed characterization of SNPs was also carried out using other experimental techniques such as Fourier transform infrared spectroscopy (FTIR), field-emission scanning electron microscopy (FESEM), energy-dispersive X-ray spectroscopy (EDS), transmission electron microscopy (TEM), and powder X-ray diffraction (PXRD). SNPs show a remarkable catalytic activity of up to 90% for the reduction of the cationic dye methylene blue.
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Affiliation(s)
- Indresh Kumar
- Department
of Chemistry, Lucknow University, Lucknow 226007, Uttar Pradesh, India
| | - Chinky Gangwar
- Department
of Chemistry, Lucknow University, Lucknow 226007, Uttar Pradesh, India
| | - Bushra Yaseen
- Department
of Chemistry, Lucknow University, Lucknow 226007, Uttar Pradesh, India
| | - Pradeep Kumar Pandey
- Department
of Chemistry, Lucknow University, Lucknow 226007, Uttar Pradesh, India
| | - Sheo K. Mishra
- Department
of Physics, Indira Gandhi National Tribal
University, Amarkantak 484887, Madhya Pradesh, India
| | - Radhey Mohan Naik
- Department
of Chemistry, Lucknow University, Lucknow 226007, Uttar Pradesh, India
- Email for R.M.N.:
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5
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Huang TH, Zhao FZ, Hu QL, Liu Q, Wu TC, Zheng D, Kang T, Gui LC, Chen J. Bisphosphine-Stabilized Gold Nanoclusters with the Crown/Birdcage-Shaped Au11 Cores: Structures and Optical Properties. Inorg Chem 2020; 59:16027-16034. [DOI: 10.1021/acs.inorgchem.0c02582] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Ting-Hong Huang
- School of Chemical Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
| | - Fang-Zheng Zhao
- School of Chemical Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
| | - Qiao-Long Hu
- School of Chemical Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
| | - Qiang Liu
- College of Chemistry and Environmental Protection Engineering, Southwest Minzu University, Chengdu 610041, China
| | - Tian-Cheng Wu
- School of Chemical Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
| | - Dan Zheng
- School of Chemical Engineering, Sichuan University of Science & Engineering, Zigong 643000, China
| | - Tianyi Kang
- Department of Biomedical Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Liu-Cheng Gui
- State Key Laboratory for Chemistry and Molecular Engineering of Medicinal Resources, School of Chemistry and Pharmacy of Guangxi Normal University, Guilin 541004, China
| | - Jia Chen
- CAS Key Laboratory of Chemistry of Northwestern Plant Resources/Key Laboratory for Natural Medicine of Gansu Province, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
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6
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Iriarte-Mesa C, López YC, Matos-Peralta Y, de la Vega-Hernández K, Antuch M. Gold, Silver and Iron Oxide Nanoparticles: Synthesis and Bionanoconjugation Strategies Aimed at Electrochemical Applications. Top Curr Chem (Cham) 2020; 378:12. [PMID: 31907672 DOI: 10.1007/s41061-019-0275-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Accepted: 12/13/2019] [Indexed: 12/22/2022]
Abstract
Nanomaterials have revolutionized the sensing and biosensing fields, with the development of more sensitive and selective devices for multiple applications. Gold, silver and iron oxide nanoparticles have played a particularly major role in this development. In this review, we provide a general overview of the synthesis and characteristics of gold, silver and iron oxide nanoparticles, along with the main strategies for their surface functionalization with ligands and biomolecules. Finally, different architectures suitable for electrochemical applications are reviewed, as well as their main fabrication procedures. We conclude with some considerations from the authors' perspective regarding the promising use of these materials and the challenges to be faced in the near future.
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Affiliation(s)
- Claudia Iriarte-Mesa
- Laboratorio de Química Bioinorgánica, Departamento de Química General e Inorgánica, Facultad de Química, Universidad de La Habana, Zapata y G, Vedado, Plaza de la Revolución, 10 400, La Habana, Cuba
| | - Yeisy C López
- Laboratorio de Química Bioinorgánica, Departamento de Química General e Inorgánica, Facultad de Química, Universidad de La Habana, Zapata y G, Vedado, Plaza de la Revolución, 10 400, La Habana, Cuba.,Instituto Politécnico Nacional, Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada, Calzada Legaria 694, Col. Irrigación, 11 500, Ciudad de México, Mexico
| | - Yasser Matos-Peralta
- Laboratorio de Química Bioinorgánica, Departamento de Química General e Inorgánica, Facultad de Química, Universidad de La Habana, Zapata y G, Vedado, Plaza de la Revolución, 10 400, La Habana, Cuba
| | | | - Manuel Antuch
- Unité de Chimie et Procédés, École Nationale Supérieure de Techniques Avancées (ENSTA), Institut Polytechnique de Paris, 828 Boulevard des Maréchaux, 91120, Palaiseau, France.
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7
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Li Z, Kang Q, Chen L, Zhang B, Zou G, Shen D. Enhancing aqueous stability and radiative-charge-transfer efficiency of CsPbBr3 perovskite nanocrystals via conductive silica gel coating. Electrochim Acta 2020. [DOI: 10.1016/j.electacta.2019.135332] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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8
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Park M, Salem DP, Parviz D, Gong X, Silmore KS, Lew TTS, Khong DT, Ang MCY, Kwak SY, Chan-Park MB, Strano MS. Measuring the Accessible Surface Area within the Nanoparticle Corona Using Molecular Probe Adsorption. NANO LETTERS 2019; 19:7712-7724. [PMID: 31565943 PMCID: PMC7206615 DOI: 10.1021/acs.nanolett.9b02647] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
The corona phase-the adsorbed layer of polymer, surfactant, or stabilizer molecules around a nanoparticle-is typically utilized to disperse nanoparticles into a solution or solid phase. However, this phase also controls molecular access to the nanoparticle surface, a property important for catalytic activity and sensor applications. Unfortunately, few methods can directly probe the structure of this corona phase, which is subcategorized as either a hard, immobile corona or a soft, transient corona in exchange with components in the bulk solution. In this work, we introduce a molecular probe adsorption (MPA) method for measuring the accessible nanoparticle surface area using a titration of a quenchable fluorescent molecule. For example, riboflavin is utilized to measure the surface area of gold nanoparticle standards, as well as corona phases on dispersed single-walled carbon nanotubes and graphene sheets. A material balance on the titration yields certain surface coverage parameters, including the ratio of the surface area to dissociation constant of the fluorophore, q/KD, as well as KD itself. Uncertainty, precision, and the correlation of these parameters across different experimental systems, preparations, and modalities are all discussed. Using MPA across a series of corona phases, we find that the Gibbs free energy of probe binding scales inversely with the cube root of surface area, q. In this way, MPA is the only technique to date capable of discerning critical structure-property relationships for such nanoparticle surface phases. Hence, MPA is a rapid quantitative technique that should prove useful for elucidating corona structure for nanoparticles across different systems.
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Affiliation(s)
- Minkyung Park
- Department of Chemical Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Daniel P Salem
- Department of Chemical Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Dorsa Parviz
- Department of Chemical Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Xun Gong
- Department of Chemical Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Kevin S Silmore
- Department of Chemical Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Tedrick Thomas Salim Lew
- Department of Chemical Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Duc Thinh Khong
- Disruptive & Sustainable Technologies for Agricultural Precision IRG , Singapore-MIT Alliance for Research and Technology , 1 Create Way , Singapore 138602 , Singapore
- School of Chemical and Biomedical Engineering , Nanyang Technological University , 62, Nanyang Drive , Singapore 637459 , Singapore
| | - Mervin Chun-Yi Ang
- Disruptive & Sustainable Technologies for Agricultural Precision IRG , Singapore-MIT Alliance for Research and Technology , 1 Create Way , Singapore 138602 , Singapore
| | - Seon-Yeong Kwak
- Department of Biosystems and Biomaterials Science and Engineering , Seoul National University , Seoul 08826 , Republic of Korea
| | - Mary B Chan-Park
- Disruptive & Sustainable Technologies for Agricultural Precision IRG , Singapore-MIT Alliance for Research and Technology , 1 Create Way , Singapore 138602 , Singapore
- School of Chemical and Biomedical Engineering , Nanyang Technological University , 62, Nanyang Drive , Singapore 637459 , Singapore
| | - Michael S Strano
- Department of Chemical Engineering , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
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9
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Seo J, Moon SW, Kang H, Choi BH, Seo JH. Foldable and Extremely Scratch-Resistant Hard Coating Materials from Molecular Necklace-like Cross-Linkers. ACS APPLIED MATERIALS & INTERFACES 2019; 11:27306-27317. [PMID: 31241308 DOI: 10.1021/acsami.9b05738] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
A flexible hard coating material displaying extreme scratch resistance and foldable flexibility was developed via the design of an organic-inorganic hybrid coating material employing an alkoxysilyl-functionalized polyrotaxane cross-linker (PRX_Si1). PRX_Si1 has a molecular necklace-like structure that can form organic-inorganic cross-linking points and provide large molecular movements. It was postulated that the scratch resistance and flexibility could be simultaneously increased because of the hybrid cross-linking points and dynamic molecular movements. To confirm this hypothesis, the crystalline structure and mechanical properties of the PRX_Si1-based hard coating material were analyzed via transmission electron microscopy, small-angle X-ray diffraction, tensile, pencil hardness, and scratch tests. Finally, the PRX_Si1-based hard coating material could form homogeneously dispersed nanoscale siloxane crystalline domains, and the strain at the break point was 3 times higher than that of a commercial hard coating material, resulting in no defect formation even after 5000 folding test runs. Moreover, the material displayed extremely high pencil hardness (9H) and scratch resistance.
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Affiliation(s)
- Jiae Seo
- Department of Materials Science and Engineering , Korea University , Anam-ro 145 , Seongbuk-gu, Seoul , Korea
| | - Sung Wook Moon
- School of Mechanical Engineering, College of Engineering , Korea University , Anam-ro 145 , Seongbuk-gu, Seoul , Korea
| | - Heemin Kang
- Department of Materials Science and Engineering , Korea University , Anam-ro 145 , Seongbuk-gu, Seoul , Korea
| | - Byoung-Ho Choi
- School of Mechanical Engineering, College of Engineering , Korea University , Anam-ro 145 , Seongbuk-gu, Seoul , Korea
| | - Ji-Hun Seo
- Department of Materials Science and Engineering , Korea University , Anam-ro 145 , Seongbuk-gu, Seoul , Korea
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10
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Mulens-Arias V, Nicolás-Boluda A, Gehanno A, Balfourier A, Carn F, Gazeau F. Polyethyleneimine-assisted one-pot synthesis of quasi-fractal plasmonic gold nanocomposites as a photothermal theranostic agent. NANOSCALE 2019; 11:3344-3359. [PMID: 30724952 DOI: 10.1039/c8nr09849b] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Gold nanoparticles have been thoroughly used in designing thermal ablative therapies and in photoacoustic imaging in cancer treatment owing to their unique and tunable plasmonic properties. While the plasmonic properties highly depend on the size and structure, controllable aggregation of gold nanoparticles can trigger a plasmonic coupling of adjacent electronic clouds, henceforth leading to an increase of light absorption within the near-infrared (NIR) window. Polymer-engraftment of gold nanoparticles has been investigated to achieve the plasmonic coupling phenomenon, but complex chemical steps are often needed to accomplish a biomedically relevant product. An appealing and controllable manner of achieving polymer-based plasmon coupling is a template-assisted Au+3 reduction that ensures in situ gold reduction and coalescence. Among the polymers exploited as reducing agents are polyethyleneimines (PEI). In this study, we addressed the PEI-assisted synthesis of gold nanoparticles and their further aggregation to obtain fractal NIR-absorbent plasmonic nanoaggregates for photothermal therapy and photoacoustic imaging of colorectal cancer. PEI-assisted Au+3 reduction was followed up by UV-visible light absorption, small-angle X-ray scattering (SAXS), and photo-thermal conversion. The reaction kinetics, stability, and the photothermal plasmonic properties of the as-synthesized nanocomposites tightly depended on the PEI : Au ratio. We defined a PEI-Au ratio range (2.5-5) for the one-pot synthesis of gold nanoparticles that self-arrange into fractal nanoaggregates with demonstrated photo-thermal therapeutic and imaging efficiency both in vitro and in vivo in a colorectal carcinoma (CRC) animal model.
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Affiliation(s)
- Vladimir Mulens-Arias
- Laboratoire Matière et Systèmes Complexes, UMR 7075, CNRS and Université Paris Diderot, 10 Rue Alice Domon et Léonie Duquet, 75205 Paris Cedex 13, France.
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11
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Shim YH, Lee KE, Shin TJ, Kim SO, Kim SY. Tailored Colloidal Stability and Rheological Properties of Graphene Oxide Liquid Crystals with Polymer-Induced Depletion Attractions. ACS NANO 2018; 12:11399-11406. [PMID: 30407782 DOI: 10.1021/acsnano.8b06320] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Graphene oxide liquid crystallinity (GO LC) has been widely exploited for high-performance graphene-based applications. In this regard, colloidal stability of GO LC suspension is a crucial requirement, particularly while polymers are often added to the GO LC. Unfortunately, current level of knowledge on how polymers influence the structure and properties of GO LC is not sufficient to systematically guide the development of applications. Here, we investigate the microstructure and rheological properties of GO LC suspensions in the presence of polymer additives with varying molecular weights and concentrations. Similar to conventional colloidal systems, non-negligible polymer-induced interactions are found in GO LC suspensions, which can effectively modulate the interaction among GO platelets and the relevant physical properties. On the basis of extensive small-angle X-ray scattering and rheological measurements, we demonstrate that, contrary to the general perception, polymer-induced depletion attraction can increase the colloidal stability of GO, while also preventing the vitrification of GO LC. In addition, a proper level of polymer additive can reduce the viscosity of GO LC suspensions by orders of magnitude, providing an effective route to GO LC-based solution processing. After all, the colloidal stability and rheological properties of GO can significantly impact the quality of GO. Therefore, we believe that our finding will be of great interest in the field of graphene-based applications, as it presents effective strategies for improving properties.
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Affiliation(s)
| | - Kyung Eun Lee
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science & Engineering , KAIST , Daejeon , 34141 , Republic of Korea
| | | | - Sang Ouk Kim
- National Creative Research Initiative Center for Multi-Dimensional Directed Nanoscale Assembly, Department of Materials Science & Engineering , KAIST , Daejeon , 34141 , Republic of Korea
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12
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Wu S, Zhu M, Lian Q, Lu D, Spencer B, Adlam DJ, Hoyland JA, Volk K, Karg M, Saunders BR. Plasmonic and colloidal stability behaviours of Au-acrylic core-shell nanoparticles with thin pH-responsive shells. NANOSCALE 2018; 10:18565-18575. [PMID: 30259044 DOI: 10.1039/c8nr07440b] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The localised surface plasmon resonance (LSPR) of Au nanoparticles (NPs) as well as its interaction with nearby entities provides a wealth of fundamental and practical information at the nanometre scale. A number of studies have investigated core-shell NPs with Au cores and polymer shells that are temperature-responsive. However, there are very few studies of pH-responsive Au-polymer NP shells. Precipitation polymerisation is a scalable method and here we establish such a method to synthesise pH-responsive Au-poly(methyl methacrylate) copolymer core-shell NPs without the need for pre-functionalisation. The comonomers used were methacrylic acid (MAA) or 2-carboxyethyl acrylate (CEA) and the shells were crosslinked with ethylene glycol dimethacrylate. A series of five core-shell systems with collapsed shell thicknesses less than 30 nm are studied. The shell-thicknesses for the CEA-based core-shell NPs are relatively thin (≤5 nm) compared to related Au-polymer core-shell NPs prepared using precipitation polymerisation. The LSPR properties of the core-shell NPs were dependent on the shell thickness and were successfully simulated using finite difference time domain (FDTD) calculations. Two systems are considered further as exemplars. The MAA-based core-shell system with the thickest shell exhibited enhanced colloidal stability to added electrolyte. The CEA-based core-shell dispersion with the thinnest shells displayed reversible pH-triggered aggregation and was cytocompatible for HeLa cells. Proof-of-concept data are presented that demonstrate intracellular pH reporting.
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Affiliation(s)
- Shanglin Wu
- School of Materials, University of Manchester, MSS Tower, Manchester, M13 9PL, UK.
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Kwon NK, Kim H, Han IK, Shin TJ, Lee HW, Park J, Kim SY. Enhanced Mechanical Properties of Polymer Nanocomposites Using Dopamine-Modified Polymers at Nanoparticle Surfaces in Very Low Molecular Weight Polymers. ACS Macro Lett 2018; 7:962-967. [PMID: 35650973 DOI: 10.1021/acsmacrolett.8b00475] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
While incorporation of nanoparticles in a polymer matrix generally enhances the physical properties, effective control of the nanoparticle/polymer interface is often challenging. Here, we report a dramatic enhancement of the mechanical properties of polymer nanocomposites (PNCs) using a simple physical grafting method. The PNC consists of low molecular weight poly(ethylene glycol) (PEG) and silica nanoparticles whose surfaces are modified with dopamine-modified PEG (DOPA-mPEG) brush polymers. With DOPA-mPEG grafting, the nanoparticle surface can be readily altered, and the shear modulus of the PNC is increased by a factor of 105 at an appropriate surface grafting density. The detailed microstructure and mechanical properties are examined with small-angle X-ray scattering (SAXS) and oscillatory rheometry experiments. The attractive interactions between particles induced by DOPA-mPEG grafting dramatically improve the mechanical properties of PNCs even in an unentangled polymer matrix, which shows a much higher shear modulus than that of a highly entangled polymer matrix.
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