3D-Printable Bioactivated Nanocellulose–Alginate Hydrogels

Leppiniemi, Jenni; Lahtinen, Panu; Paajanen, Antti; Mahlberg, Riitta; Metsä-Kortelainen, Sini; Pinomaa, Tatu; Pajari, Heikki; Vikholm-Lundin, Inger; Pursula, Pekka; Hytönen, Vesa P.

doi:10.1021/acsami.7b02756

Cited by 280 publications

(235 citation statements)

References 27 publications

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“…Kumar et al, (2012) so že s primešanim 5 % dodatkom celuloznih nanokristalov optično utrjujočim smolam za stereolitografijo dosegli izboljšanje modula elastičnosti in natezne trdnosti v trdnem stanju za 57 %, ne da bi vplivali na sam način uporabe smole. 30 % dodatek nanoceluloznih fibril je tako za 3,6-krat izboljšal modul elastičnosti PLA materiala, ki se veliko uporablja v FDM tehniki tiskanja (Žepič et al, 2016), tiskanje pa je mogoče tudi s nanoceluloznimi hidrogeli (Pinomaa 2016;Leppiniemi et al, 2017).…”

Section: Ekstrudiranje Materiala Materials Extrusionunclassified

Možnosti uporabe lesa v dodajalnih tehnologijah (3D-tiskanju)

Kariž¹,

Šernek²,

Kuzman³

2017

les-wood

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Keywords: 3D printing, additive technology, wood, wood residues, wood-plastic composites niku prilagojeni izdelki. Veliko razvoja je bilo narejenega na samih tehnikah kot tudi materialih. Ob nižanju cen 3D-tiskalnikov na trgu so le-ti postali dostopnejši tudi za vsakdanjo domačo uporabo tiskanja. Že število iskanj termina »3D printing« na Google pokaže izrazit porast: od leta 2007 do 2015 se je število iskanj tega termina 25-krat povečalo (Wimmer et al., 2015).Osnovni princip dodajalnih tehnologij je grajenje izdelka po plasteh ali slojih, z dodajanjem materiala v slojih, za razliko od klasičnih obdelovalnih tehnik, kjer izdelek običajno izdelamo z odvzemanjem materiala (odrezovalne tehnike), preoblikovanjem materiala (npr. litje, kovanje) ali pa povezovanjem (varjenje, pritrjevanje) (Conner et al., 2014). Izdelava modelov s 3D-tiskanjem je razmeroma enostavna, saj digitalnemu modelu izdelka z ustreznim programom omogočimo razrez STL/AMF/OBJ datotek na tiskalne plasti, ki določijo 3D-tiskalniku pot, ki jo mora opraviti do celovitega končnega izdelka. Pri izdelovanju z odvzemanjem materiala orodje vedno potrebuje prosto UVOD INTRODUCTIONDodajalne tehnologije (ang. additive technologies) je izraz za vrsto različnih tehnik izdelave, katerim je skupno grajenje izdelka po plasteh/slojih. Pogovorno se te tehnologije pogosto imenuje kar 3D-tiskanje, kar izhaja iz ene prvih tehnik, kjer je bilo vezivo nanašano na podoben način kot pri običaj-nem 2D-tiskanju -brizganje tekočine iz posebnih kartuš (v primeru 3D-tiska -brizganje tekočega veziva na plast praškastega materiala). Nekoč pogost izraz je bil tudi hitro prototipiranje (ang. Rapid prototyping), čemur je bila ta tehnika prvotno namenjena -hitri izdelavi prototipov, vendar se ta izraz vse manj uporablja, saj tudi izdelki niso več samo prototipi, ampak lahko služijo tudi kot pravi izdelki, unikatni, maloserijski, ali pa individualno posamez-1 Univerza v Ljubljani, Biotehniška fakulteta, Oddelek za lesarstvo,

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Section: Ekstrudiranje Materiala Materials Extrusionunclassified

Možnosti uporabe lesa v dodajalnih tehnologijah (3D-tiskanju)

Kariž¹,

Šernek²,

Kuzman³

2017

les-wood

View full text Add to dashboard Cite

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“…Thus, thin layers of gel formed through residual heat of the first overhanging, could be caused by the solution being warmer at this stage of the print and as a result, the application of the same amount of power causes excess gelling. The printed parts needed no further cross-linking while achieving similar print fidelities as 3D printed hydrogels made from a mixture of cellulose nanocrystals and gelatin/alginate as reported by Sultan and Mathew [51] or Leppiniemi et al [52].…”

Section: Discussionmentioning

confidence: 63%

3D Printing Cellulose Hydrogels Using LASER Induced Thermal Gelation

Huber

Clucas

Vilmay

et al. 2018

JMMP

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A 3D printer was developed for the 3D printing of cellulose hydrogels using open source software and simple 3D printer hardware. Using a temperature-based sol-gel transition of cellulose dissolved in aqueous solutions of sodium hydroxide (NaOH) and urea, a three-dimensional gel can be created by moving a focused laser beam across a bath of the cellulose solution and lowering the print stage after every layer. A line width of 100-150 µm and layer thickness of 25 µm of the printed part could be achieved. No delamination between printed layers occurred and no additional support material was needed to create free hanging structures due to suspending the printed part in printing liquid. By adding cellulose powder to the solution, the gelation temperature, the gel strength and stiffness can be manipulated while maintaining a high internal porosity of the gel. A laser power of 100 mW was found to produce the highest quality print with an accurate representation of the previously designed part. Lower power settings (80 mW) produced insufficient gelation and as a result reduced print accuracy while higher power settings (120 mW) caused the gel to burn.

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“…As a result, extruded pre‐gel solutions have self‐supporting properties and form a fiber shape (Figure b) . Moreover, cellulose nanocrystals (CNC) and SiO 2 have also been utilized as rheological assistants to improve the viscoelasticity of the pre‐gel solution for 3D printing …”

Section: Shaping Nanocomposite Hydrogelsmentioning

confidence: 99%

Nanoparticle–Polymer Synergies in Nanocomposite Hydrogels: From Design to Application

Chen

Hou

Ren

et al. 2018

Macromol. Rapid Commun.

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Hydrogels are an important class of soft materials with high water retention that exhibit intelligent and elastic properties and have promising applications in the fields of biomaterials, soft machines, and artificial tissue. However, the low mechanical strength and limited functions of traditional chemically cross-linked hydrogels restrict their further applications. Natural materials that consist of stiff and soft components exhibit high mechanical strength and functionality. Among artificial soft materials, nanocomposite hydrogels are analogous to these natural materials because of the synergistic effects of nanoparticle (NP) polymers in hydrogels construction. In this article, the structural design and properties of nanocomposite hydrogels are summarized. Furthermore, along with the development of nanocomposite hydrogel-based devices, the shaping and potential applications of hydrogel devices in recent years are highlighted. The influence of the interactions between NPs and polymers on the dispersion as well as the structural stability of nanocomposite hydrogels is discussed, and the novel stimuli-responsive properties induced by the synergies between functional NPs and polymeric networks are reviewed. Finally, recent progress in the preparation and applications of nanocomposite hydrogels is highlighted. Interest in this field is growing, and the future and prospects of nanocomposite hydrogels are also reviewed.

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3D-Printable Bioactivated Nanocellulose–Alginate Hydrogels

Cited by 280 publications

References 27 publications

Možnosti uporabe lesa v dodajalnih tehnologijah (3D-tiskanju)

Možnosti uporabe lesa v dodajalnih tehnologijah (3D-tiskanju)

3D Printing Cellulose Hydrogels Using LASER Induced Thermal Gelation

Nanoparticle–Polymer Synergies in Nanocomposite Hydrogels: From Design to Application

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