Change search
Link to record
Permanent link

Direct link
BETA
Goetz, Lee
Publications (8 of 8) Show all publications
Goetz, L., Naseri, N., Nair, S. S., Karim, Z. & Mathew, A. P. (2018). All cellulose electrospun water purification membranes nanotextured using cellulose nanocrystals. Cellulose (London), 25(5), 3011-3023
Open this publication in new window or tab >>All cellulose electrospun water purification membranes nanotextured using cellulose nanocrystals
Show others...
2018 (English)In: Cellulose (London), ISSN 0969-0239, E-ISSN 1572-882X, Vol. 25, no 5, p. 3011-3023Article in journal (Refereed) Published
Abstract [en]

Cellulose acetate (CA) fibers were electrospun on a mesh template to create specific surface and pore structures for membrane applications. The mesh template CA fiber mats were impregnated with cellulose nanocrystals at varying weight percentages. The membranes showed nanotextured surfaces and improved mechanical properties post impregnation. More importantly, the hydrophilicity of the original CA fibers was increased from a hydrophobic contact angle of 102°–0° thereby creating an anti-fouling membrane surface structure. The membranes showed rejection of 20–56% for particles of 0.5–2.0 μm, indicating potential of these membranes in rejecting microorganisms from water. Furthermore, high rejection of dyes (80–99%) by adsorption and potential application as highly functional affinity membranes was demonstrated. These membranes can therefore be utilized as all-cellulose, green, scalable and low cost high flux membranes (> 20,000 LMH) for water cleaning applications in food industry where microorganisms and charged contaminants are to be removed.

Place, publisher, year, edition, pages
Springer, 2018
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-68002 (URN)10.1007/s10570-018-1751-1 (DOI)000431788000020 ()
Note

Validerad;2018;Nivå 2;2018-05-24 (andbra)

Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-09-14Bibliographically approved
Goetz, L., Karim, Z. & Mathew, A. P. (2016). Effect of micropatterned cellulose acetate membranes impregnated with cellulose and chitin nanocrystals on water filtration membrane behavior (ed.).
Open this publication in new window or tab >>Effect of micropatterned cellulose acetate membranes impregnated with cellulose and chitin nanocrystals on water filtration membrane behavior
2016 (English)Manuscript (preprint) (Other academic)
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-12827 (URN)bfa1e171-295f-4a4a-8edf-ca98d501f082 (Local ID)bfa1e171-295f-4a4a-8edf-ca98d501f082 (Archive number)bfa1e171-295f-4a4a-8edf-ca98d501f082 (OAI)
Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24
Goetz, L., Jalvo, B., Rosal, R. & Mathew, A. P. (2016). Superhydrophilic anti-fouling electrospun cellulose acetate membranes coated with chitin nanocrystals for water filtration (ed.). Journal of Membrane Science, 510, 238-248
Open this publication in new window or tab >>Superhydrophilic anti-fouling electrospun cellulose acetate membranes coated with chitin nanocrystals for water filtration
2016 (English)In: Journal of Membrane Science, ISSN 0376-7388, E-ISSN 1873-3123, Vol. 510, p. 238-248Article in journal (Refereed) Published
Abstract [en]

Electrospun cellulose acetate (CA) random mats were prepared and surface coated with chitin nanocrystals (ChNC) to obtain water filtration membranes with tailored surface characteristics. Chitin nanocrystals self-assembled on the surface of CA fibers into homogenous nanostructured networks during drying that stabilized via hydrogen bonding and formed webbed film-structures at the junctions of the electrospun fibers. Coating of CA random mats using 5% chitin nanocrystals increased the strength by 131% and stiffness by 340% accompanied by a decrease in strain. The flux through these membranes was as high as 14217 L m−2 h−1 at 0.5 bar. The chitin nanocrystal surface coating significantly impacted the surface properties of the membranes, producing a superhydrophilic membrane (contact angle 0°) from the original hydrophobic CA mats (contact angle 132°). The coated membranes also showed significant reduction in biofouling and biofilm formation as well as demonstrated improved resistance to fouling with bovine serum albumin and humic acid fouling solutions. The current approach opens up an easy, environmental friendly and efficient route to produce highly hydrophilic membranes with high water flux and low fouling for microfiltration water purification process wash water from food industry for biological contaminants.

National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-5493 (URN)10.1016/j.memsci.2016.02.069 (DOI)000375127300025 ()2-s2.0-84960970681 (Scopus ID)39c588e5-f1ed-42a5-97c4-bfe68a8b89f0 (Local ID)39c588e5-f1ed-42a5-97c4-bfe68a8b89f0 (Archive number)39c588e5-f1ed-42a5-97c4-bfe68a8b89f0 (OAI)
Note

Validerad; 2016; Nivå 2; 20160303 (andbra)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Liu, P., Karim, Z., Goetz, L., Oksman, K. & Mathew, A. P. (2014). Biobased nanoparticles and membranes for water purification via selective adsorption: Possibilities and challenges (ed.). Paper presented at Nordic Filtration Symposium : 09/09/2014 - 10/09/2014. Paper presented at Nordic Filtration Symposium : 09/09/2014 - 10/09/2014.
Open this publication in new window or tab >>Biobased nanoparticles and membranes for water purification via selective adsorption: Possibilities and challenges
Show others...
2014 (English)Conference paper, Oral presentation only (Refereed)
Abstract [en]

With population expansion and industrialization, water pollutions have become one of the biggest threat to human society today. The combination of biotechnology and nanotechnology offers a new and green way to the problems. Cellulose nanofibers cellulose nanocrystals and chitin nanocrystals have nanoscaled diameters and have high specific surface areas, an advantage in membrane technology and the efficiency can be further enhanced using specific functionalization, enabling highly specific interactions with targeted contaminant entities in water. Moreover, the nano-dimensions of the used active species allow the fabrication of compact and ultra-thin multifunctional membranes by introducing an orientation and/or concentration gradient. This novel water purification approach combines the physical filtration process and the adsorption process exploring the capability of the nanocellulose and/or nanochitin (with or without functionalization) to selectively adsorb, store and desorb contaminants from industrial water and drinking water while passing through a highly permeable membranes/ filters. The aim is to tailor membarnes and filters with high flux which reduces pressure and thereby energy consumption while keeping the high selectivity efficiency due to surface adsorption. The results showed highly efficient removal of metal ions (Ag+, Cu2+ and Fe3)+ from mirror making industry using nanocellulose based membranes. High removal efficiency of dyes, nitrates and organic foulants using bio- based membranes/ filters was also confirmed. The nanocellulose and nanochitin based membranes also showed significant resistance to bio-fouling. The scaled up membranes is expected to be used in the form of spiral wound modules, cartridge modules and MBR modules for water treatment in mirror industries, printing industries, mining industries as well as municipal water and storm water in Europe.

National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-28056 (URN)1b595601-f22f-49d4-9cc1-13230592b8a2 (Local ID)1b595601-f22f-49d4-9cc1-13230592b8a2 (Archive number)1b595601-f22f-49d4-9cc1-13230592b8a2 (OAI)
Conference
Nordic Filtration Symposium : 09/09/2014 - 10/09/2014
Note
Godkänd; 2014; 20141010 (pengliu)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Goetz, L., Mathew, A. P., Oksman, K. & Ragauskas, A. J. (2011). Thermal gravimetric analysis of in-situ crosslinked nanocellulose whiskers - poly(methyl vinyl ether-co-maleic acid) - polyethylene glycol (ed.). Paper presented at . TAPPI Journal, 10(4), 29-33
Open this publication in new window or tab >>Thermal gravimetric analysis of in-situ crosslinked nanocellulose whiskers - poly(methyl vinyl ether-co-maleic acid) - polyethylene glycol
2011 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 10, no 4, p. 29-33Article in journal (Refereed) Published
Abstract [en]

The thermal stability and decomposition of in-situ crosslinked nanocellulose whiskers – poly(methyl vinyl ether-co-maleic acid) – polyethylene glycol formulations (PMVEMA-PEG), (25%, 50%, and 75% whiskers) – were investigated using thermal gravimetric analysis (TGA) methods. The thermal degradation behavior of the films varied according to the percent cellulose whiskers in each formulation. The presence of cellulose whiskers increased the thermal stability of the PMVEMA-PEG matrix. Application: It is possible to develop novel material properties by cross-linking cellulose whiskers in which the final physical properties are derived from the cross-linking reagents and cross-linking density. This study examines the thermal properties of cross-linking sulfuric acid derived cellulose whiskers with PMVEMA-PEG, which will be a key property as these tunable hydrogels are utilized for value-added packaging applications.

National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-5545 (URN)3ace9ceb-d739-46c2-9ee5-524a37db7b62 (Local ID)3ace9ceb-d739-46c2-9ee5-524a37db7b62 (Archive number)3ace9ceb-d739-46c2-9ee5-524a37db7b62 (OAI)
Note
Validerad; 2011; 20110513 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Goetz, L., Folston, M., Mathew, A. P., Oksman, K. & Ragauskas, A. J. (2010). Poly(methyl vinyl ether-co-maleic acid)-Polyethylene glycol nanocomposites cross-linked in situ with cellulose nanowhiskers (ed.). Paper presented at . Biomacromolecules, 11(10), 2660-2666
Open this publication in new window or tab >>Poly(methyl vinyl ether-co-maleic acid)-Polyethylene glycol nanocomposites cross-linked in situ with cellulose nanowhiskers
Show others...
2010 (English)In: Biomacromolecules, ISSN 1525-7797, E-ISSN 1526-4602, Vol. 11, no 10, p. 2660-2666Article in journal (Refereed) Published
Abstract [en]

Nanocomposites were developed by cross-linking cellulose nanowhiskers with poly(methyl vinyl ether-co-maleic acid) and polyethylene glycol. Nuclear magnetic resonance (NMR) studies showed cross-linking occurs between the matrix and cellulose nanowhiskers via an esterification reaction. Proton NMR T 2 relaxation experiments provided information on the mobility of the polymer chains within the matrix, which can be related to the structure of the cross-linked nanocomposite. The nanocomposite was found to consist of mobile chain portions between cross-linked junction points and immobilized chain segments near or at those junction points, whose relative fraction increased upon further incorporation of cellulose nanowhiskers. Atomic force microscopy images showed a homogeneous dispersion of nanowhiskers in the matrix even at high nanowhisker content, which can be attributed to cross-linking of the nanowhiskers in the matrix. Relative humidity conditions were found to affect the mechanical properties of the composites negatively while the nanowhiskers content had a positive effect. It is expected that the cross-links between the matrix and the cellulose nanowhiskers trap the nanowhiskers in the cross-linked network, preventing nanowhisker aggregation subsequently producing cellulose nanocomposites with unique mechanical behaviors. The results show that in situ cross-linking of cellulose nanowhiskers with a matrix polymer is a promising route to obtain nanocomposites with well dispersed nanowhiskers, tailored nanostructure, and mechanical performance

National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-7333 (URN)10.1021/bm1006695 (DOI)000282840200016 ()2-s2.0-77957883010 (Scopus ID)5b32d0d0-e267-11df-8b36-000ea68e967b (Local ID)5b32d0d0-e267-11df-8b36-000ea68e967b (Archive number)5b32d0d0-e267-11df-8b36-000ea68e967b (OAI)
Note
Validerad; 2010; 20101028 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Goetz, L., Mathew, A. P., Oksman, K., Gatenholm, P. & Ragauskas, A. (2009). A novel nanocomposite film prepared from crosslinked cellulosic whiskers (ed.). Carbohydrate Polymers, 75(1), 85-89
Open this publication in new window or tab >>A novel nanocomposite film prepared from crosslinked cellulosic whiskers
Show others...
2009 (English)In: Carbohydrate Polymers, ISSN 0144-8617, E-ISSN 1879-1344, Vol. 75, no 1, p. 85-89Article in journal (Refereed) Published
Abstract [en]

Cellulose whiskers are increasingly being used as a reinforcing phase in polymer systems and their use is a growing area of importance in bionanocomposite research. Although the reinforcing effect of cellulose whiskers has been studied in various polymers, the impact of crosslinking cellulose whiskers has not been explored so far. This work deals with the development of novel cellulose nanocomposites, wherein the cellulose nanowhiskers are crosslinked with poly(methyl vinyl ether-co-maleic acid) and poly(ethylene glycol). The morphology of the nanocomposite was studied using atomic force microscopy (AFM), which revealed a network structure embedded in a continuous phase. The water sorption studies demonstrated that the crosslinked nanocomposites are capable of absorbing up to ~ 900% water and have potential to be used as hydrogels.

National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-15213 (URN)10.1016/j.carbpol.2008.06.017 (DOI)000260148600013 ()2-s2.0-51849108445 (Scopus ID)eb652200-3ded-11dd-ab50-000ea68e967b (Local ID)eb652200-3ded-11dd-ab50-000ea68e967b (Archive number)eb652200-3ded-11dd-ab50-000ea68e967b (OAI)
Note

Validerad; 2009; 20080619 (krioks)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Goetz, L., Ragauskas, A. J., Mathew, A. P. & Oksman, K. (2008). Tying cellulose whiskers together (ed.). Paper presented at American Chemical Society National Meeting & Exposition : 06/04/2008 - 10/04/2008. Abstract of Papers of the American Chemical Society, 235(229)
Open this publication in new window or tab >>Tying cellulose whiskers together
2008 (English)In: Abstract of Papers of the American Chemical Society, ISSN 0065-7727, Vol. 235, no 229Article in journal, Meeting abstract (Other academic) Published
National Category
Bio Materials
Research subject
Wood and Bionanocomposites
Identifiers
urn:nbn:se:ltu:diva-29494 (URN)3002c0f0-7acf-11df-ab16-000ea68e967b (Local ID)3002c0f0-7acf-11df-ab16-000ea68e967b (Archive number)3002c0f0-7acf-11df-ab16-000ea68e967b (OAI)
Conference
American Chemical Society National Meeting & Exposition : 06/04/2008 - 10/04/2008
Note
Godkänd; 2008; 20100618 (ysko)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-30Bibliographically approved
Organisations

Search in DiVA

Show all publications